Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | Copyright (C) 2002 Richard Henderson |
Rusty Russell | 51f3d0f | 2010-08-05 12:59:13 -0600 | [diff] [blame] | 3 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software |
| 17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
Paul Gortmaker | 9984de1 | 2011-05-23 14:51:41 -0400 | [diff] [blame] | 19 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/moduleloader.h> |
Steven Rostedt | 6d72373 | 2009-04-10 14:53:50 -0400 | [diff] [blame] | 21 | #include <linux/ftrace_event.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/init.h> |
Alexey Dobriyan | ae84e32 | 2007-05-08 00:28:38 -0700 | [diff] [blame] | 23 | #include <linux/kallsyms.h> |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 24 | #include <linux/file.h> |
Alexey Dobriyan | 3b5d5c6 | 2008-10-06 13:19:27 +0400 | [diff] [blame] | 25 | #include <linux/fs.h> |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 26 | #include <linux/sysfs.h> |
Randy Dunlap | 9f15833 | 2005-09-13 01:25:16 -0700 | [diff] [blame] | 27 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/slab.h> |
| 29 | #include <linux/vmalloc.h> |
| 30 | #include <linux/elf.h> |
Alexey Dobriyan | 3b5d5c6 | 2008-10-06 13:19:27 +0400 | [diff] [blame] | 31 | #include <linux/proc_fs.h> |
Kees Cook | 2e72d51 | 2012-10-16 07:32:07 +1030 | [diff] [blame] | 32 | #include <linux/security.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/seq_file.h> |
| 34 | #include <linux/syscalls.h> |
| 35 | #include <linux/fcntl.h> |
| 36 | #include <linux/rcupdate.h> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 37 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/cpu.h> |
| 39 | #include <linux/moduleparam.h> |
| 40 | #include <linux/errno.h> |
| 41 | #include <linux/err.h> |
| 42 | #include <linux/vermagic.h> |
| 43 | #include <linux/notifier.h> |
Al Viro | f6a5703 | 2006-10-18 01:47:25 -0400 | [diff] [blame] | 44 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <linux/stop_machine.h> |
| 46 | #include <linux/device.h> |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 47 | #include <linux/string.h> |
Arjan van de Ven | 97d1f15 | 2006-03-23 03:00:24 -0800 | [diff] [blame] | 48 | #include <linux/mutex.h> |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 49 | #include <linux/rculist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <asm/cacheflush.h> |
Bernd Schmidt | eb8cdec | 2009-09-21 17:03:57 -0700 | [diff] [blame] | 52 | #include <asm/mmu_context.h> |
Sam Ravnborg | b817f6f | 2006-06-09 21:53:55 +0200 | [diff] [blame] | 53 | #include <linux/license.h> |
Christoph Lameter | 6d76239 | 2008-02-08 04:18:42 -0800 | [diff] [blame] | 54 | #include <asm/sections.h> |
Mathieu Desnoyers | 97e1c18 | 2008-07-18 12:16:16 -0400 | [diff] [blame] | 55 | #include <linux/tracepoint.h> |
Steven Rostedt | 90d595f | 2008-08-14 15:45:09 -0400 | [diff] [blame] | 56 | #include <linux/ftrace.h> |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 57 | #include <linux/async.h> |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 58 | #include <linux/percpu.h> |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 59 | #include <linux/kmemleak.h> |
Jason Baron | bf5438fc | 2010-09-17 11:09:00 -0400 | [diff] [blame] | 60 | #include <linux/jump_label.h> |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 61 | #include <linux/pfn.h> |
Alessio Igor Bogani | 403ed27 | 2011-04-20 11:10:52 +0200 | [diff] [blame] | 62 | #include <linux/bsearch.h> |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 63 | #include <uapi/linux/module.h> |
Rusty Russell | 106a4ee | 2012-09-26 10:09:40 +0100 | [diff] [blame] | 64 | #include "module-internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Li Zefan | 7ead8b8 | 2009-08-17 16:56:28 +0800 | [diff] [blame] | 66 | #define CREATE_TRACE_POINTS |
| 67 | #include <trace/events/module.h> |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #ifndef ARCH_SHF_SMALL |
| 70 | #define ARCH_SHF_SMALL 0 |
| 71 | #endif |
| 72 | |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 73 | /* |
| 74 | * Modules' sections will be aligned on page boundaries |
| 75 | * to ensure complete separation of code and data, but |
| 76 | * only when CONFIG_DEBUG_SET_MODULE_RONX=y |
| 77 | */ |
| 78 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
| 79 | # define debug_align(X) ALIGN(X, PAGE_SIZE) |
| 80 | #else |
| 81 | # define debug_align(X) (X) |
| 82 | #endif |
| 83 | |
| 84 | /* |
| 85 | * Given BASE and SIZE this macro calculates the number of pages the |
| 86 | * memory regions occupies |
| 87 | */ |
| 88 | #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \ |
| 89 | (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \ |
| 90 | PFN_DOWN((unsigned long)BASE) + 1) \ |
| 91 | : (0UL)) |
| 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | /* If this is set, the section belongs in the init part of the module */ |
| 94 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) |
| 95 | |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 96 | /* |
| 97 | * Mutex protects: |
| 98 | * 1) List of modules (also safely readable with preempt_disable), |
| 99 | * 2) module_use links, |
| 100 | * 3) module_addr_min/module_addr_max. |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 101 | * (delete uses stop_machine/add uses RCU list operations). */ |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 102 | DEFINE_MUTEX(module_mutex); |
| 103 | EXPORT_SYMBOL_GPL(module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | static LIST_HEAD(modules); |
Jason Wessel | 67fc4e0 | 2010-05-20 21:04:21 -0500 | [diff] [blame] | 105 | #ifdef CONFIG_KGDB_KDB |
| 106 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ |
| 107 | #endif /* CONFIG_KGDB_KDB */ |
| 108 | |
Rusty Russell | 106a4ee | 2012-09-26 10:09:40 +0100 | [diff] [blame] | 109 | #ifdef CONFIG_MODULE_SIG |
| 110 | #ifdef CONFIG_MODULE_SIG_FORCE |
| 111 | static bool sig_enforce = true; |
| 112 | #else |
| 113 | static bool sig_enforce = false; |
| 114 | |
| 115 | static int param_set_bool_enable_only(const char *val, |
| 116 | const struct kernel_param *kp) |
| 117 | { |
| 118 | int err; |
| 119 | bool test; |
| 120 | struct kernel_param dummy_kp = *kp; |
| 121 | |
| 122 | dummy_kp.arg = &test; |
| 123 | |
| 124 | err = param_set_bool(val, &dummy_kp); |
| 125 | if (err) |
| 126 | return err; |
| 127 | |
| 128 | /* Don't let them unset it once it's set! */ |
| 129 | if (!test && sig_enforce) |
| 130 | return -EROFS; |
| 131 | |
| 132 | if (test) |
| 133 | sig_enforce = true; |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | static const struct kernel_param_ops param_ops_bool_enable_only = { |
Jani Nikula | 6a4c264 | 2014-08-27 06:21:23 +0930 | [diff] [blame] | 138 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
Rusty Russell | 106a4ee | 2012-09-26 10:09:40 +0100 | [diff] [blame] | 139 | .set = param_set_bool_enable_only, |
| 140 | .get = param_get_bool, |
| 141 | }; |
| 142 | #define param_check_bool_enable_only param_check_bool |
| 143 | |
| 144 | module_param(sig_enforce, bool_enable_only, 0644); |
| 145 | #endif /* !CONFIG_MODULE_SIG_FORCE */ |
| 146 | #endif /* CONFIG_MODULE_SIG */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Stephen Rothwell | 19e4529 | 2009-04-14 17:27:18 +1000 | [diff] [blame] | 148 | /* Block module loading/unloading? */ |
| 149 | int modules_disabled = 0; |
Dave Young | 02608be | 2012-02-01 10:33:14 +0800 | [diff] [blame] | 150 | core_param(nomodule, modules_disabled, bint, 0); |
Stephen Rothwell | 19e4529 | 2009-04-14 17:27:18 +1000 | [diff] [blame] | 151 | |
Rusty Russell | c9a3ba5 | 2008-01-29 17:13:18 -0500 | [diff] [blame] | 152 | /* Waiting for a module to finish initializing? */ |
| 153 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); |
| 154 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 155 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 157 | /* Bounds of module allocation, for speeding __module_address. |
| 158 | * Protected by module_mutex. */ |
Rusty Russell | 3a642e9 | 2008-07-22 19:24:28 -0500 | [diff] [blame] | 159 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | int register_module_notifier(struct notifier_block * nb) |
| 162 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 163 | return blocking_notifier_chain_register(&module_notify_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | EXPORT_SYMBOL(register_module_notifier); |
| 166 | |
| 167 | int unregister_module_notifier(struct notifier_block * nb) |
| 168 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 169 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | } |
| 171 | EXPORT_SYMBOL(unregister_module_notifier); |
| 172 | |
Rusty Russell | eded41c | 2010-08-05 12:59:07 -0600 | [diff] [blame] | 173 | struct load_info { |
| 174 | Elf_Ehdr *hdr; |
| 175 | unsigned long len; |
| 176 | Elf_Shdr *sechdrs; |
Rusty Russell | 6526c53 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 177 | char *secstrings, *strtab; |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 178 | unsigned long symoffs, stroffs; |
Rusty Russell | 811d66a | 2010-08-05 12:59:12 -0600 | [diff] [blame] | 179 | struct _ddebug *debug; |
| 180 | unsigned int num_debug; |
Rusty Russell | 106a4ee | 2012-09-26 10:09:40 +0100 | [diff] [blame] | 181 | bool sig_ok; |
Rusty Russell | eded41c | 2010-08-05 12:59:07 -0600 | [diff] [blame] | 182 | struct { |
| 183 | unsigned int sym, str, mod, vers, info, pcpu; |
| 184 | } index; |
| 185 | }; |
| 186 | |
Matti Linnanvuori | 9a4b970 | 2007-11-08 08:37:38 -0800 | [diff] [blame] | 187 | /* We require a truly strong try_module_get(): 0 means failure due to |
| 188 | ongoing or failed initialization etc. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | static inline int strong_try_module_get(struct module *mod) |
| 190 | { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 191 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | if (mod && mod->state == MODULE_STATE_COMING) |
Rusty Russell | c9a3ba5 | 2008-01-29 17:13:18 -0500 | [diff] [blame] | 193 | return -EBUSY; |
| 194 | if (try_module_get(mod)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | return 0; |
Rusty Russell | c9a3ba5 | 2008-01-29 17:13:18 -0500 | [diff] [blame] | 196 | else |
| 197 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | } |
| 199 | |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 200 | static inline void add_taint_module(struct module *mod, unsigned flag, |
| 201 | enum lockdep_ok lockdep_ok) |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 202 | { |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 203 | add_taint(flag, lockdep_ok); |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 204 | mod->taints |= (1U << flag); |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 205 | } |
| 206 | |
Robert P. J. Day | 02a3e59 | 2007-05-09 07:26:28 +0200 | [diff] [blame] | 207 | /* |
| 208 | * A thread that wants to hold a reference to a module only while it |
| 209 | * is running can call this to safely exit. nfsd and lockd use this. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | */ |
| 211 | void __module_put_and_exit(struct module *mod, long code) |
| 212 | { |
| 213 | module_put(mod); |
| 214 | do_exit(code); |
| 215 | } |
| 216 | EXPORT_SYMBOL(__module_put_and_exit); |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | /* Find a module section: 0 means not found. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 219 | static unsigned int find_sec(const struct load_info *info, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | { |
| 221 | unsigned int i; |
| 222 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 223 | for (i = 1; i < info->hdr->e_shnum; i++) { |
| 224 | Elf_Shdr *shdr = &info->sechdrs[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | /* Alloc bit cleared means "ignore it." */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 226 | if ((shdr->sh_flags & SHF_ALLOC) |
| 227 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | return i; |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 229 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | return 0; |
| 231 | } |
| 232 | |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 233 | /* Find a module section, or NULL. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 234 | static void *section_addr(const struct load_info *info, const char *name) |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 235 | { |
| 236 | /* Section 0 has sh_addr 0. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 237 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 241 | static void *section_objs(const struct load_info *info, |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 242 | const char *name, |
| 243 | size_t object_size, |
| 244 | unsigned int *num) |
| 245 | { |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 246 | unsigned int sec = find_sec(info, name); |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 247 | |
| 248 | /* Section 0 has sh_addr 0 and sh_size 0. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 249 | *num = info->sechdrs[sec].sh_size / object_size; |
| 250 | return (void *)info->sechdrs[sec].sh_addr; |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 251 | } |
| 252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | /* Provided by the linker */ |
| 254 | extern const struct kernel_symbol __start___ksymtab[]; |
| 255 | extern const struct kernel_symbol __stop___ksymtab[]; |
| 256 | extern const struct kernel_symbol __start___ksymtab_gpl[]; |
| 257 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 258 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
| 259 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | extern const unsigned long __start___kcrctab[]; |
| 261 | extern const unsigned long __start___kcrctab_gpl[]; |
Greg Kroah-Hartman | 9f28bb7 | 2006-03-20 13:17:13 -0800 | [diff] [blame] | 262 | extern const unsigned long __start___kcrctab_gpl_future[]; |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 263 | #ifdef CONFIG_UNUSED_SYMBOLS |
| 264 | extern const struct kernel_symbol __start___ksymtab_unused[]; |
| 265 | extern const struct kernel_symbol __stop___ksymtab_unused[]; |
| 266 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; |
| 267 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 268 | extern const unsigned long __start___kcrctab_unused[]; |
| 269 | extern const unsigned long __start___kcrctab_unused_gpl[]; |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 270 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
| 272 | #ifndef CONFIG_MODVERSIONS |
| 273 | #define symversion(base, idx) NULL |
| 274 | #else |
Andrew Morton | f83ca9f | 2006-03-28 01:56:20 -0800 | [diff] [blame] | 275 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | #endif |
| 277 | |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 278 | static bool each_symbol_in_section(const struct symsearch *arr, |
| 279 | unsigned int arrsize, |
| 280 | struct module *owner, |
| 281 | bool (*fn)(const struct symsearch *syms, |
| 282 | struct module *owner, |
Rusty Russell | de4d8d5 | 2011-04-19 21:49:58 +0200 | [diff] [blame] | 283 | void *data), |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 284 | void *data) |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 285 | { |
Rusty Russell | de4d8d5 | 2011-04-19 21:49:58 +0200 | [diff] [blame] | 286 | unsigned int j; |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 287 | |
| 288 | for (j = 0; j < arrsize; j++) { |
Rusty Russell | de4d8d5 | 2011-04-19 21:49:58 +0200 | [diff] [blame] | 289 | if (fn(&arr[j], owner, data)) |
| 290 | return true; |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 291 | } |
| 292 | |
| 293 | return false; |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 294 | } |
| 295 | |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 296 | /* Returns true as soon as fn returns true, otherwise false. */ |
Rusty Russell | de4d8d5 | 2011-04-19 21:49:58 +0200 | [diff] [blame] | 297 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
| 298 | struct module *owner, |
| 299 | void *data), |
| 300 | void *data) |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 301 | { |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 302 | struct module *mod; |
Linus Torvalds | 44032e6 | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 303 | static const struct symsearch arr[] = { |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 304 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
| 305 | NOT_GPL_ONLY, false }, |
| 306 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
| 307 | __start___kcrctab_gpl, |
| 308 | GPL_ONLY, false }, |
| 309 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
| 310 | __start___kcrctab_gpl_future, |
| 311 | WILL_BE_GPL_ONLY, false }, |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 312 | #ifdef CONFIG_UNUSED_SYMBOLS |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 313 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
| 314 | __start___kcrctab_unused, |
| 315 | NOT_GPL_ONLY, true }, |
| 316 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
| 317 | __start___kcrctab_unused_gpl, |
| 318 | GPL_ONLY, true }, |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 319 | #endif |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 320 | }; |
| 321 | |
| 322 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
| 323 | return true; |
| 324 | |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 325 | list_for_each_entry_rcu(mod, &modules, list) { |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 326 | struct symsearch arr[] = { |
| 327 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, |
| 328 | NOT_GPL_ONLY, false }, |
| 329 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
| 330 | mod->gpl_crcs, |
| 331 | GPL_ONLY, false }, |
| 332 | { mod->gpl_future_syms, |
| 333 | mod->gpl_future_syms + mod->num_gpl_future_syms, |
| 334 | mod->gpl_future_crcs, |
| 335 | WILL_BE_GPL_ONLY, false }, |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 336 | #ifdef CONFIG_UNUSED_SYMBOLS |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 337 | { mod->unused_syms, |
| 338 | mod->unused_syms + mod->num_unused_syms, |
| 339 | mod->unused_crcs, |
| 340 | NOT_GPL_ONLY, true }, |
| 341 | { mod->unused_gpl_syms, |
| 342 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, |
| 343 | mod->unused_gpl_crcs, |
| 344 | GPL_ONLY, true }, |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 345 | #endif |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 346 | }; |
| 347 | |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 348 | if (mod->state == MODULE_STATE_UNFORMED) |
| 349 | continue; |
| 350 | |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 351 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
| 352 | return true; |
| 353 | } |
| 354 | return false; |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 355 | } |
Rusty Russell | de4d8d5 | 2011-04-19 21:49:58 +0200 | [diff] [blame] | 356 | EXPORT_SYMBOL_GPL(each_symbol_section); |
Arjan van de Ven | f71d20e | 2006-06-28 04:26:45 -0700 | [diff] [blame] | 357 | |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 358 | struct find_symbol_arg { |
| 359 | /* Input */ |
| 360 | const char *name; |
| 361 | bool gplok; |
| 362 | bool warn; |
| 363 | |
| 364 | /* Output */ |
| 365 | struct module *owner; |
| 366 | const unsigned long *crc; |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 367 | const struct kernel_symbol *sym; |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 368 | }; |
| 369 | |
Rusty Russell | de4d8d5 | 2011-04-19 21:49:58 +0200 | [diff] [blame] | 370 | static bool check_symbol(const struct symsearch *syms, |
| 371 | struct module *owner, |
| 372 | unsigned int symnum, void *data) |
Rusty Russell | ad9546c | 2008-05-01 21:14:59 -0500 | [diff] [blame] | 373 | { |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 374 | struct find_symbol_arg *fsa = data; |
| 375 | |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 376 | if (!fsa->gplok) { |
| 377 | if (syms->licence == GPL_ONLY) |
| 378 | return false; |
| 379 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 380 | pr_warn("Symbol %s is being used by a non-GPL module, " |
| 381 | "which will not be allowed in the future\n", |
| 382 | fsa->name); |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 383 | } |
| 384 | } |
| 385 | |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 386 | #ifdef CONFIG_UNUSED_SYMBOLS |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 387 | if (syms->unused && fsa->warn) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 388 | pr_warn("Symbol %s is marked as UNUSED, however this module is " |
| 389 | "using it.\n", fsa->name); |
| 390 | pr_warn("This symbol will go away in the future.\n"); |
| 391 | pr_warn("Please evalute if this is the right api to use and if " |
| 392 | "it really is, submit a report the linux kernel " |
| 393 | "mailinglist together with submitting your code for " |
| 394 | "inclusion.\n"); |
Rusty Russell | ad9546c | 2008-05-01 21:14:59 -0500 | [diff] [blame] | 395 | } |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 396 | #endif |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 397 | |
| 398 | fsa->owner = owner; |
| 399 | fsa->crc = symversion(syms->crcs, symnum); |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 400 | fsa->sym = &syms->start[symnum]; |
Rusty Russell | ad9546c | 2008-05-01 21:14:59 -0500 | [diff] [blame] | 401 | return true; |
| 402 | } |
| 403 | |
Alessio Igor Bogani | 403ed27 | 2011-04-20 11:10:52 +0200 | [diff] [blame] | 404 | static int cmp_name(const void *va, const void *vb) |
| 405 | { |
| 406 | const char *a; |
| 407 | const struct kernel_symbol *b; |
| 408 | a = va; b = vb; |
| 409 | return strcmp(a, b->name); |
| 410 | } |
| 411 | |
Rusty Russell | de4d8d5 | 2011-04-19 21:49:58 +0200 | [diff] [blame] | 412 | static bool find_symbol_in_section(const struct symsearch *syms, |
| 413 | struct module *owner, |
| 414 | void *data) |
| 415 | { |
| 416 | struct find_symbol_arg *fsa = data; |
Alessio Igor Bogani | 403ed27 | 2011-04-20 11:10:52 +0200 | [diff] [blame] | 417 | struct kernel_symbol *sym; |
Rusty Russell | de4d8d5 | 2011-04-19 21:49:58 +0200 | [diff] [blame] | 418 | |
Alessio Igor Bogani | 403ed27 | 2011-04-20 11:10:52 +0200 | [diff] [blame] | 419 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, |
| 420 | sizeof(struct kernel_symbol), cmp_name); |
| 421 | |
| 422 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) |
| 423 | return true; |
| 424 | |
Rusty Russell | de4d8d5 | 2011-04-19 21:49:58 +0200 | [diff] [blame] | 425 | return false; |
| 426 | } |
| 427 | |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 428 | /* Find a symbol and return it, along with, (optional) crc and |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 429 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 430 | const struct kernel_symbol *find_symbol(const char *name, |
| 431 | struct module **owner, |
| 432 | const unsigned long **crc, |
| 433 | bool gplok, |
| 434 | bool warn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | { |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 436 | struct find_symbol_arg fsa; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 438 | fsa.name = name; |
| 439 | fsa.gplok = gplok; |
| 440 | fsa.warn = warn; |
| 441 | |
Rusty Russell | de4d8d5 | 2011-04-19 21:49:58 +0200 | [diff] [blame] | 442 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
Rusty Russell | ad9546c | 2008-05-01 21:14:59 -0500 | [diff] [blame] | 443 | if (owner) |
Rusty Russell | dafd094 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 444 | *owner = fsa.owner; |
| 445 | if (crc) |
| 446 | *crc = fsa.crc; |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 447 | return fsa.sym; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } |
Rusty Russell | ad9546c | 2008-05-01 21:14:59 -0500 | [diff] [blame] | 449 | |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 450 | pr_debug("Failed to find symbol %s\n", name); |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 451 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | } |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 453 | EXPORT_SYMBOL_GPL(find_symbol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | /* Search for module by name: must hold module_mutex. */ |
Mathias Krause | 4f6de4d | 2013-07-02 15:35:11 +0930 | [diff] [blame] | 456 | static struct module *find_module_all(const char *name, size_t len, |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 457 | bool even_unformed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | { |
| 459 | struct module *mod; |
| 460 | |
| 461 | list_for_each_entry(mod, &modules, list) { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 462 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
| 463 | continue; |
Mathias Krause | 4f6de4d | 2013-07-02 15:35:11 +0930 | [diff] [blame] | 464 | if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | return mod; |
| 466 | } |
| 467 | return NULL; |
| 468 | } |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 469 | |
| 470 | struct module *find_module(const char *name) |
| 471 | { |
Mathias Krause | 4f6de4d | 2013-07-02 15:35:11 +0930 | [diff] [blame] | 472 | return find_module_all(name, strlen(name), false); |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 473 | } |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 474 | EXPORT_SYMBOL_GPL(find_module); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
| 476 | #ifdef CONFIG_SMP |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 477 | |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 478 | static inline void __percpu *mod_percpu(struct module *mod) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 479 | { |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 480 | return mod->percpu; |
| 481 | } |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 482 | |
Rusty Russell | 9eb76d7 | 2013-07-03 10:06:29 +0930 | [diff] [blame] | 483 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 484 | { |
Rusty Russell | 9eb76d7 | 2013-07-03 10:06:29 +0930 | [diff] [blame] | 485 | Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
| 486 | unsigned long align = pcpusec->sh_addralign; |
| 487 | |
| 488 | if (!pcpusec->sh_size) |
| 489 | return 0; |
| 490 | |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 491 | if (align > PAGE_SIZE) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 492 | pr_warn("%s: per-cpu alignment %li > %li\n", |
| 493 | mod->name, align, PAGE_SIZE); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 494 | align = PAGE_SIZE; |
| 495 | } |
| 496 | |
Rusty Russell | 9eb76d7 | 2013-07-03 10:06:29 +0930 | [diff] [blame] | 497 | mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 498 | if (!mod->percpu) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 499 | pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
| 500 | mod->name, (unsigned long)pcpusec->sh_size); |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 501 | return -ENOMEM; |
| 502 | } |
Rusty Russell | 9eb76d7 | 2013-07-03 10:06:29 +0930 | [diff] [blame] | 503 | mod->percpu_size = pcpusec->sh_size; |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 504 | return 0; |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 505 | } |
| 506 | |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 507 | static void percpu_modfree(struct module *mod) |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 508 | { |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 509 | free_percpu(mod->percpu); |
Tejun Heo | fbf59bc | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 510 | } |
| 511 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 512 | static unsigned int find_pcpusec(struct load_info *info) |
Tejun Heo | 6b588c1 | 2009-02-20 16:29:07 +0900 | [diff] [blame] | 513 | { |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 514 | return find_sec(info, ".data..percpu"); |
Tejun Heo | 6b588c1 | 2009-02-20 16:29:07 +0900 | [diff] [blame] | 515 | } |
| 516 | |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 517 | static void percpu_modcopy(struct module *mod, |
| 518 | const void *from, unsigned long size) |
Tejun Heo | 6b588c1 | 2009-02-20 16:29:07 +0900 | [diff] [blame] | 519 | { |
| 520 | int cpu; |
| 521 | |
| 522 | for_each_possible_cpu(cpu) |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 523 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
Tejun Heo | 6b588c1 | 2009-02-20 16:29:07 +0900 | [diff] [blame] | 524 | } |
| 525 | |
Tejun Heo | 10fad5e | 2010-03-10 18:57:54 +0900 | [diff] [blame] | 526 | /** |
| 527 | * is_module_percpu_address - test whether address is from module static percpu |
| 528 | * @addr: address to test |
| 529 | * |
| 530 | * Test whether @addr belongs to module static percpu area. |
| 531 | * |
| 532 | * RETURNS: |
| 533 | * %true if @addr is from module static percpu area |
| 534 | */ |
| 535 | bool is_module_percpu_address(unsigned long addr) |
| 536 | { |
| 537 | struct module *mod; |
| 538 | unsigned int cpu; |
| 539 | |
| 540 | preempt_disable(); |
| 541 | |
| 542 | list_for_each_entry_rcu(mod, &modules, list) { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 543 | if (mod->state == MODULE_STATE_UNFORMED) |
| 544 | continue; |
Tejun Heo | 10fad5e | 2010-03-10 18:57:54 +0900 | [diff] [blame] | 545 | if (!mod->percpu_size) |
| 546 | continue; |
| 547 | for_each_possible_cpu(cpu) { |
| 548 | void *start = per_cpu_ptr(mod->percpu, cpu); |
| 549 | |
| 550 | if ((void *)addr >= start && |
| 551 | (void *)addr < start + mod->percpu_size) { |
| 552 | preempt_enable(); |
| 553 | return true; |
| 554 | } |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | preempt_enable(); |
| 559 | return false; |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 560 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
| 562 | #else /* ... !CONFIG_SMP */ |
Tejun Heo | 6b588c1 | 2009-02-20 16:29:07 +0900 | [diff] [blame] | 563 | |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 564 | static inline void __percpu *mod_percpu(struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | { |
| 566 | return NULL; |
| 567 | } |
Rusty Russell | 9eb76d7 | 2013-07-03 10:06:29 +0930 | [diff] [blame] | 568 | static int percpu_modalloc(struct module *mod, struct load_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | { |
Rusty Russell | 9eb76d7 | 2013-07-03 10:06:29 +0930 | [diff] [blame] | 570 | /* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
| 571 | if (info->sechdrs[info->index.pcpu].sh_size != 0) |
| 572 | return -ENOMEM; |
| 573 | return 0; |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 574 | } |
| 575 | static inline void percpu_modfree(struct module *mod) |
| 576 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | } |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 578 | static unsigned int find_pcpusec(struct load_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | { |
| 580 | return 0; |
| 581 | } |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 582 | static inline void percpu_modcopy(struct module *mod, |
| 583 | const void *from, unsigned long size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | { |
| 585 | /* pcpusec should be 0, and size of that section should be 0. */ |
| 586 | BUG_ON(size != 0); |
| 587 | } |
Tejun Heo | 10fad5e | 2010-03-10 18:57:54 +0900 | [diff] [blame] | 588 | bool is_module_percpu_address(unsigned long addr) |
| 589 | { |
| 590 | return false; |
| 591 | } |
Tejun Heo | 6b588c1 | 2009-02-20 16:29:07 +0900 | [diff] [blame] | 592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | #endif /* CONFIG_SMP */ |
| 594 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 595 | #define MODINFO_ATTR(field) \ |
| 596 | static void setup_modinfo_##field(struct module *mod, const char *s) \ |
| 597 | { \ |
| 598 | mod->field = kstrdup(s, GFP_KERNEL); \ |
| 599 | } \ |
| 600 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 601 | struct module_kobject *mk, char *buffer) \ |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 602 | { \ |
Chen Gang | cc56ded | 2013-08-20 15:34:21 +0930 | [diff] [blame] | 603 | return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 604 | } \ |
| 605 | static int modinfo_##field##_exists(struct module *mod) \ |
| 606 | { \ |
| 607 | return mod->field != NULL; \ |
| 608 | } \ |
| 609 | static void free_modinfo_##field(struct module *mod) \ |
| 610 | { \ |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 611 | kfree(mod->field); \ |
| 612 | mod->field = NULL; \ |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 613 | } \ |
| 614 | static struct module_attribute modinfo_##field = { \ |
Tejun Heo | 7b59575 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 615 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 616 | .show = show_modinfo_##field, \ |
| 617 | .setup = setup_modinfo_##field, \ |
| 618 | .test = modinfo_##field##_exists, \ |
| 619 | .free = free_modinfo_##field, \ |
| 620 | }; |
| 621 | |
| 622 | MODINFO_ATTR(version); |
| 623 | MODINFO_ATTR(srcversion); |
| 624 | |
Arjan van de Ven | e14af7e | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 625 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
| 626 | |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 627 | #ifdef CONFIG_MODULE_UNLOAD |
Steven Rostedt | eb0c537 | 2010-03-29 14:25:18 -0400 | [diff] [blame] | 628 | |
| 629 | EXPORT_TRACEPOINT_SYMBOL(module_get); |
| 630 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | /* Init the unload section of the module. */ |
Rusty Russell | 9f85a4b | 2010-08-05 12:59:04 -0600 | [diff] [blame] | 632 | static int module_unload_init(struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | { |
Rusty Russell | 9f85a4b | 2010-08-05 12:59:04 -0600 | [diff] [blame] | 634 | mod->refptr = alloc_percpu(struct module_ref); |
| 635 | if (!mod->refptr) |
| 636 | return -ENOMEM; |
| 637 | |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 638 | INIT_LIST_HEAD(&mod->source_list); |
| 639 | INIT_LIST_HEAD(&mod->target_list); |
Christoph Lameter | e1783a2 | 2010-01-05 15:34:50 +0900 | [diff] [blame] | 640 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | /* Hold reference count during initialization. */ |
Christoph Lameter | 08f141d | 2014-04-07 15:39:39 -0700 | [diff] [blame] | 642 | raw_cpu_write(mod->refptr->incs, 1); |
Rusty Russell | 9f85a4b | 2010-08-05 12:59:04 -0600 | [diff] [blame] | 643 | |
| 644 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | } |
| 646 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | /* Does a already use b? */ |
| 648 | static int already_uses(struct module *a, struct module *b) |
| 649 | { |
| 650 | struct module_use *use; |
| 651 | |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 652 | list_for_each_entry(use, &b->source_list, source_list) { |
| 653 | if (use->source == a) { |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 654 | pr_debug("%s uses %s!\n", a->name, b->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | return 1; |
| 656 | } |
| 657 | } |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 658 | pr_debug("%s does not use %s!\n", a->name, b->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | return 0; |
| 660 | } |
| 661 | |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 662 | /* |
| 663 | * Module a uses b |
| 664 | * - we add 'a' as a "source", 'b' as a "target" of module use |
| 665 | * - the module_use is added to the list of 'b' sources (so |
| 666 | * 'b' can walk the list to see who sourced them), and of 'a' |
| 667 | * targets (so 'a' can see what modules it targets). |
| 668 | */ |
| 669 | static int add_module_usage(struct module *a, struct module *b) |
| 670 | { |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 671 | struct module_use *use; |
| 672 | |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 673 | pr_debug("Allocating new usage for %s.\n", a->name); |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 674 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
| 675 | if (!use) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 676 | pr_warn("%s: out of memory loading\n", a->name); |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 677 | return -ENOMEM; |
| 678 | } |
| 679 | |
| 680 | use->source = a; |
| 681 | use->target = b; |
| 682 | list_add(&use->source_list, &b->source_list); |
| 683 | list_add(&use->target_list, &a->target_list); |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 684 | return 0; |
| 685 | } |
| 686 | |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 687 | /* Module a uses b: caller needs module_mutex() */ |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 688 | int ref_module(struct module *a, struct module *b) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | { |
Rusty Russell | c8e21ce | 2010-06-05 11:17:35 -0600 | [diff] [blame] | 690 | int err; |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 691 | |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 692 | if (b == NULL || already_uses(a, b)) |
Linus Torvalds | 218ce73 | 2010-05-25 16:48:30 -0700 | [diff] [blame] | 693 | return 0; |
Linus Torvalds | 218ce73 | 2010-05-25 16:48:30 -0700 | [diff] [blame] | 694 | |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 695 | /* If module isn't available, we fail. */ |
| 696 | err = strong_try_module_get(b); |
Rusty Russell | c9a3ba5 | 2008-01-29 17:13:18 -0500 | [diff] [blame] | 697 | if (err) |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 698 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 700 | err = add_module_usage(a, b); |
| 701 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | module_put(b); |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 703 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | } |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 705 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | } |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 707 | EXPORT_SYMBOL_GPL(ref_module); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | |
| 709 | /* Clear the unload stuff of the module. */ |
| 710 | static void module_unload_free(struct module *mod) |
| 711 | { |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 712 | struct module_use *use, *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 714 | mutex_lock(&module_mutex); |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 715 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
| 716 | struct module *i = use->target; |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 717 | pr_debug("%s unusing %s\n", mod->name, i->name); |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 718 | module_put(i); |
| 719 | list_del(&use->source_list); |
| 720 | list_del(&use->target_list); |
| 721 | kfree(use); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | } |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 723 | mutex_unlock(&module_mutex); |
Rusty Russell | 9f85a4b | 2010-08-05 12:59:04 -0600 | [diff] [blame] | 724 | |
| 725 | free_percpu(mod->refptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | } |
| 727 | |
| 728 | #ifdef CONFIG_MODULE_FORCE_UNLOAD |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 729 | static inline int try_force_unload(unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | { |
| 731 | int ret = (flags & O_TRUNC); |
| 732 | if (ret) |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 733 | add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | return ret; |
| 735 | } |
| 736 | #else |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 737 | static inline int try_force_unload(unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | { |
| 739 | return 0; |
| 740 | } |
| 741 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ |
| 742 | |
| 743 | struct stopref |
| 744 | { |
| 745 | struct module *mod; |
| 746 | int flags; |
| 747 | int *forced; |
| 748 | }; |
| 749 | |
| 750 | /* Whole machine is stopped with interrupts off when this runs. */ |
| 751 | static int __try_stop_module(void *_sref) |
| 752 | { |
| 753 | struct stopref *sref = _sref; |
| 754 | |
Rusty Russell | da39ba5 | 2008-07-22 19:24:25 -0500 | [diff] [blame] | 755 | /* If it's not unused, quit unless we're forcing. */ |
| 756 | if (module_refcount(sref->mod) != 0) { |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 757 | if (!(*sref->forced = try_force_unload(sref->flags))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | return -EWOULDBLOCK; |
| 759 | } |
| 760 | |
| 761 | /* Mark it as dying. */ |
| 762 | sref->mod->state = MODULE_STATE_GOING; |
| 763 | return 0; |
| 764 | } |
| 765 | |
| 766 | static int try_stop_module(struct module *mod, int flags, int *forced) |
| 767 | { |
Rusty Russell | 3f2b9c9 | 2013-09-17 05:48:51 +0930 | [diff] [blame] | 768 | struct stopref sref = { mod, flags, forced }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
Rusty Russell | 3f2b9c9 | 2013-09-17 05:48:51 +0930 | [diff] [blame] | 770 | return stop_machine(__try_stop_module, &sref, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | } |
| 772 | |
Eric Dumazet | bd77c04 | 2012-01-13 09:32:14 +1030 | [diff] [blame] | 773 | unsigned long module_refcount(struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | { |
Eric Dumazet | bd77c04 | 2012-01-13 09:32:14 +1030 | [diff] [blame] | 775 | unsigned long incs = 0, decs = 0; |
Eric Dumazet | 720eba3 | 2009-02-03 13:31:36 +1030 | [diff] [blame] | 776 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
Eric Dumazet | 720eba3 | 2009-02-03 13:31:36 +1030 | [diff] [blame] | 778 | for_each_possible_cpu(cpu) |
Nick Piggin | 5fbfb18 | 2010-04-01 19:09:40 +1100 | [diff] [blame] | 779 | decs += per_cpu_ptr(mod->refptr, cpu)->decs; |
| 780 | /* |
| 781 | * ensure the incs are added up after the decs. |
| 782 | * module_put ensures incs are visible before decs with smp_wmb. |
| 783 | * |
| 784 | * This 2-count scheme avoids the situation where the refcount |
| 785 | * for CPU0 is read, then CPU0 increments the module refcount, |
| 786 | * then CPU1 drops that refcount, then the refcount for CPU1 is |
| 787 | * read. We would record a decrement but not its corresponding |
| 788 | * increment so we would see a low count (disaster). |
| 789 | * |
| 790 | * Rare situation? But module_refcount can be preempted, and we |
| 791 | * might be tallying up 4096+ CPUs. So it is not impossible. |
| 792 | */ |
| 793 | smp_rmb(); |
| 794 | for_each_possible_cpu(cpu) |
| 795 | incs += per_cpu_ptr(mod->refptr, cpu)->incs; |
| 796 | return incs - decs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | } |
| 798 | EXPORT_SYMBOL(module_refcount); |
| 799 | |
| 800 | /* This exists whether we can unload or not */ |
| 801 | static void free_module(struct module *mod); |
| 802 | |
Heiko Carstens | 17da2bd | 2009-01-14 14:14:10 +0100 | [diff] [blame] | 803 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
| 804 | unsigned int, flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | { |
| 806 | struct module *mod; |
Greg Kroah-Hartman | dfff0a0 | 2007-02-23 14:54:57 -0800 | [diff] [blame] | 807 | char name[MODULE_NAME_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | int ret, forced = 0; |
| 809 | |
Kees Cook | 3d43321 | 2009-04-02 15:49:29 -0700 | [diff] [blame] | 810 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
Greg Kroah-Hartman | dfff0a0 | 2007-02-23 14:54:57 -0800 | [diff] [blame] | 811 | return -EPERM; |
| 812 | |
| 813 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) |
| 814 | return -EFAULT; |
| 815 | name[MODULE_NAME_LEN-1] = '\0'; |
| 816 | |
Tejun Heo | 3fc1f1e | 2010-05-06 18:49:20 +0200 | [diff] [blame] | 817 | if (mutex_lock_interruptible(&module_mutex) != 0) |
| 818 | return -EINTR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
| 820 | mod = find_module(name); |
| 821 | if (!mod) { |
| 822 | ret = -ENOENT; |
| 823 | goto out; |
| 824 | } |
| 825 | |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 826 | if (!list_empty(&mod->source_list)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | /* Other modules depend on us: get rid of them first. */ |
| 828 | ret = -EWOULDBLOCK; |
| 829 | goto out; |
| 830 | } |
| 831 | |
| 832 | /* Doing init or already dying? */ |
| 833 | if (mod->state != MODULE_STATE_LIVE) { |
Rusty Russell | 3f2b9c9 | 2013-09-17 05:48:51 +0930 | [diff] [blame] | 834 | /* FIXME: if (force), slam module count damn the torpedoes */ |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 835 | pr_debug("%s already dying\n", mod->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | ret = -EBUSY; |
| 837 | goto out; |
| 838 | } |
| 839 | |
| 840 | /* If it has an init func, it must have an exit func to unload */ |
Rusty Russell | af49d92 | 2007-10-16 23:26:27 -0700 | [diff] [blame] | 841 | if (mod->init && !mod->exit) { |
Akinobu Mita | fb16979 | 2006-01-08 01:04:29 -0800 | [diff] [blame] | 842 | forced = try_force_unload(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | if (!forced) { |
| 844 | /* This module can't be removed */ |
| 845 | ret = -EBUSY; |
| 846 | goto out; |
| 847 | } |
| 848 | } |
| 849 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | /* Stop the machine so refcounts can't move and disable module. */ |
| 851 | ret = try_stop_module(mod, flags, &forced); |
| 852 | if (ret != 0) |
| 853 | goto out; |
| 854 | |
Peter Oberparleiter | df4b565 | 2008-04-21 14:34:31 +0200 | [diff] [blame] | 855 | mutex_unlock(&module_mutex); |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 856 | /* Final destruction now no one is using it. */ |
Peter Oberparleiter | df4b565 | 2008-04-21 14:34:31 +0200 | [diff] [blame] | 857 | if (mod->exit != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | mod->exit(); |
Peter Oberparleiter | df4b565 | 2008-04-21 14:34:31 +0200 | [diff] [blame] | 859 | blocking_notifier_call_chain(&module_notify_list, |
| 860 | MODULE_STATE_GOING, mod); |
Arjan van de Ven | 22a9d64 | 2009-01-07 08:45:46 -0800 | [diff] [blame] | 861 | async_synchronize_full(); |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 862 | |
Arjan van de Ven | e14af7e | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 863 | /* Store the name of the last unloaded module for diagnostic purposes */ |
Rusty Russell | efa5345 | 2008-01-29 17:13:20 -0500 | [diff] [blame] | 864 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 866 | free_module(mod); |
| 867 | return 0; |
| 868 | out: |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 869 | mutex_unlock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | return ret; |
| 871 | } |
| 872 | |
Jianjun Kong | d1e99d7 | 2008-12-08 14:26:29 +0800 | [diff] [blame] | 873 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | { |
| 875 | struct module_use *use; |
| 876 | int printed_something = 0; |
| 877 | |
Eric Dumazet | bd77c04 | 2012-01-13 09:32:14 +1030 | [diff] [blame] | 878 | seq_printf(m, " %lu ", module_refcount(mod)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
| 880 | /* Always include a trailing , so userspace can differentiate |
| 881 | between this and the old multi-field proc format. */ |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 882 | list_for_each_entry(use, &mod->source_list, source_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | printed_something = 1; |
Linus Torvalds | 2c02dfe | 2010-05-31 12:19:37 -0700 | [diff] [blame] | 884 | seq_printf(m, "%s,", use->source->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | } |
| 886 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | if (mod->init != NULL && mod->exit == NULL) { |
| 888 | printed_something = 1; |
| 889 | seq_printf(m, "[permanent],"); |
| 890 | } |
| 891 | |
| 892 | if (!printed_something) |
| 893 | seq_printf(m, "-"); |
| 894 | } |
| 895 | |
| 896 | void __symbol_put(const char *symbol) |
| 897 | { |
| 898 | struct module *owner; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 900 | preempt_disable(); |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 901 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | BUG(); |
| 903 | module_put(owner); |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 904 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | } |
| 906 | EXPORT_SYMBOL(__symbol_put); |
| 907 | |
Rusty Russell | 7d1d16e | 2009-08-26 22:02:54 +0930 | [diff] [blame] | 908 | /* Note this assumes addr is a function, which it currently always is. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | void symbol_put_addr(void *addr) |
| 910 | { |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 911 | struct module *modaddr; |
Rusty Russell | 7d1d16e | 2009-08-26 22:02:54 +0930 | [diff] [blame] | 912 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
Rusty Russell | 7d1d16e | 2009-08-26 22:02:54 +0930 | [diff] [blame] | 914 | if (core_kernel_text(a)) |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 915 | return; |
| 916 | |
Rusty Russell | a6e6abd | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 917 | /* module_text_address is safe here: we're supposed to have reference |
| 918 | * to module from symbol_get, so it can't go away. */ |
Rusty Russell | 7d1d16e | 2009-08-26 22:02:54 +0930 | [diff] [blame] | 919 | modaddr = __module_text_address(a); |
Rusty Russell | a6e6abd | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 920 | BUG_ON(!modaddr); |
Trent Piepho | 5e37661 | 2006-05-15 09:44:06 -0700 | [diff] [blame] | 921 | module_put(modaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | } |
| 923 | EXPORT_SYMBOL_GPL(symbol_put_addr); |
| 924 | |
| 925 | static ssize_t show_refcnt(struct module_attribute *mattr, |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 926 | struct module_kobject *mk, char *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | { |
Eric Dumazet | bd77c04 | 2012-01-13 09:32:14 +1030 | [diff] [blame] | 928 | return sprintf(buffer, "%lu\n", module_refcount(mk->mod)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | } |
| 930 | |
Kay Sievers | cca3e70 | 2012-01-13 09:32:15 +1030 | [diff] [blame] | 931 | static struct module_attribute modinfo_refcnt = |
| 932 | __ATTR(refcnt, 0444, show_refcnt, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
Steven Rostedt | d53799b | 2012-03-26 12:50:52 +1030 | [diff] [blame] | 934 | void __module_get(struct module *module) |
| 935 | { |
| 936 | if (module) { |
| 937 | preempt_disable(); |
| 938 | __this_cpu_inc(module->refptr->incs); |
| 939 | trace_module_get(module, _RET_IP_); |
| 940 | preempt_enable(); |
| 941 | } |
| 942 | } |
| 943 | EXPORT_SYMBOL(__module_get); |
| 944 | |
| 945 | bool try_module_get(struct module *module) |
| 946 | { |
| 947 | bool ret = true; |
| 948 | |
| 949 | if (module) { |
| 950 | preempt_disable(); |
| 951 | |
| 952 | if (likely(module_is_live(module))) { |
| 953 | __this_cpu_inc(module->refptr->incs); |
| 954 | trace_module_get(module, _RET_IP_); |
| 955 | } else |
| 956 | ret = false; |
| 957 | |
| 958 | preempt_enable(); |
| 959 | } |
| 960 | return ret; |
| 961 | } |
| 962 | EXPORT_SYMBOL(try_module_get); |
| 963 | |
Al Viro | f6a5703 | 2006-10-18 01:47:25 -0400 | [diff] [blame] | 964 | void module_put(struct module *module) |
| 965 | { |
| 966 | if (module) { |
Christoph Lameter | e1783a2 | 2010-01-05 15:34:50 +0900 | [diff] [blame] | 967 | preempt_disable(); |
Nick Piggin | 5fbfb18 | 2010-04-01 19:09:40 +1100 | [diff] [blame] | 968 | smp_wmb(); /* see comment in module_refcount */ |
| 969 | __this_cpu_inc(module->refptr->decs); |
Christoph Lameter | e1783a2 | 2010-01-05 15:34:50 +0900 | [diff] [blame] | 970 | |
Li Zefan | ae832d1 | 2010-03-24 10:57:43 +0800 | [diff] [blame] | 971 | trace_module_put(module, _RET_IP_); |
Christoph Lameter | e1783a2 | 2010-01-05 15:34:50 +0900 | [diff] [blame] | 972 | preempt_enable(); |
Al Viro | f6a5703 | 2006-10-18 01:47:25 -0400 | [diff] [blame] | 973 | } |
| 974 | } |
| 975 | EXPORT_SYMBOL(module_put); |
| 976 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | #else /* !CONFIG_MODULE_UNLOAD */ |
Jianjun Kong | d1e99d7 | 2008-12-08 14:26:29 +0800 | [diff] [blame] | 978 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | { |
| 980 | /* We don't know the usage count, or what modules are using. */ |
| 981 | seq_printf(m, " - -"); |
| 982 | } |
| 983 | |
| 984 | static inline void module_unload_free(struct module *mod) |
| 985 | { |
| 986 | } |
| 987 | |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 988 | int ref_module(struct module *a, struct module *b) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | { |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 990 | return strong_try_module_get(b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | } |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 992 | EXPORT_SYMBOL_GPL(ref_module); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
Rusty Russell | 9f85a4b | 2010-08-05 12:59:04 -0600 | [diff] [blame] | 994 | static inline int module_unload_init(struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | { |
Rusty Russell | 9f85a4b | 2010-08-05 12:59:04 -0600 | [diff] [blame] | 996 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | } |
| 998 | #endif /* CONFIG_MODULE_UNLOAD */ |
| 999 | |
Kevin Winchester | 53999bf | 2012-01-15 19:32:55 -0400 | [diff] [blame] | 1000 | static size_t module_flags_taint(struct module *mod, char *buf) |
| 1001 | { |
| 1002 | size_t l = 0; |
| 1003 | |
| 1004 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
| 1005 | buf[l++] = 'P'; |
| 1006 | if (mod->taints & (1 << TAINT_OOT_MODULE)) |
| 1007 | buf[l++] = 'O'; |
| 1008 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
| 1009 | buf[l++] = 'F'; |
| 1010 | if (mod->taints & (1 << TAINT_CRAP)) |
| 1011 | buf[l++] = 'C'; |
Mathieu Desnoyers | 66cc69e | 2014-03-13 12:11:30 +1030 | [diff] [blame] | 1012 | if (mod->taints & (1 << TAINT_UNSIGNED_MODULE)) |
Rusty Russell | 57673c2 | 2014-03-31 14:39:57 +1030 | [diff] [blame] | 1013 | buf[l++] = 'E'; |
Kevin Winchester | 53999bf | 2012-01-15 19:32:55 -0400 | [diff] [blame] | 1014 | /* |
| 1015 | * TAINT_FORCED_RMMOD: could be added. |
Dave Jones | 8c90487 | 2014-02-26 10:49:49 -0500 | [diff] [blame] | 1016 | * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't |
Kevin Winchester | 53999bf | 2012-01-15 19:32:55 -0400 | [diff] [blame] | 1017 | * apply to modules. |
| 1018 | */ |
| 1019 | return l; |
| 1020 | } |
| 1021 | |
Kay Sievers | 1f71740 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1022 | static ssize_t show_initstate(struct module_attribute *mattr, |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 1023 | struct module_kobject *mk, char *buffer) |
Kay Sievers | 1f71740 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1024 | { |
| 1025 | const char *state = "unknown"; |
| 1026 | |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 1027 | switch (mk->mod->state) { |
Kay Sievers | 1f71740 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1028 | case MODULE_STATE_LIVE: |
| 1029 | state = "live"; |
| 1030 | break; |
| 1031 | case MODULE_STATE_COMING: |
| 1032 | state = "coming"; |
| 1033 | break; |
| 1034 | case MODULE_STATE_GOING: |
| 1035 | state = "going"; |
| 1036 | break; |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 1037 | default: |
| 1038 | BUG(); |
Kay Sievers | 1f71740 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1039 | } |
| 1040 | return sprintf(buffer, "%s\n", state); |
| 1041 | } |
| 1042 | |
Kay Sievers | cca3e70 | 2012-01-13 09:32:15 +1030 | [diff] [blame] | 1043 | static struct module_attribute modinfo_initstate = |
| 1044 | __ATTR(initstate, 0444, show_initstate, NULL); |
Kay Sievers | 1f71740 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1045 | |
Kay Sievers | 88bfa32 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 1046 | static ssize_t store_uevent(struct module_attribute *mattr, |
| 1047 | struct module_kobject *mk, |
| 1048 | const char *buffer, size_t count) |
| 1049 | { |
| 1050 | enum kobject_action action; |
| 1051 | |
| 1052 | if (kobject_action_type(buffer, count, &action) == 0) |
| 1053 | kobject_uevent(&mk->kobj, action); |
| 1054 | return count; |
| 1055 | } |
| 1056 | |
Kay Sievers | cca3e70 | 2012-01-13 09:32:15 +1030 | [diff] [blame] | 1057 | struct module_attribute module_uevent = |
| 1058 | __ATTR(uevent, 0200, NULL, store_uevent); |
| 1059 | |
| 1060 | static ssize_t show_coresize(struct module_attribute *mattr, |
| 1061 | struct module_kobject *mk, char *buffer) |
| 1062 | { |
| 1063 | return sprintf(buffer, "%u\n", mk->mod->core_size); |
| 1064 | } |
| 1065 | |
| 1066 | static struct module_attribute modinfo_coresize = |
| 1067 | __ATTR(coresize, 0444, show_coresize, NULL); |
| 1068 | |
| 1069 | static ssize_t show_initsize(struct module_attribute *mattr, |
| 1070 | struct module_kobject *mk, char *buffer) |
| 1071 | { |
| 1072 | return sprintf(buffer, "%u\n", mk->mod->init_size); |
| 1073 | } |
| 1074 | |
| 1075 | static struct module_attribute modinfo_initsize = |
| 1076 | __ATTR(initsize, 0444, show_initsize, NULL); |
| 1077 | |
| 1078 | static ssize_t show_taint(struct module_attribute *mattr, |
| 1079 | struct module_kobject *mk, char *buffer) |
| 1080 | { |
| 1081 | size_t l; |
| 1082 | |
| 1083 | l = module_flags_taint(mk->mod, buffer); |
| 1084 | buffer[l++] = '\n'; |
| 1085 | return l; |
| 1086 | } |
| 1087 | |
| 1088 | static struct module_attribute modinfo_taint = |
| 1089 | __ATTR(taint, 0444, show_taint, NULL); |
Kay Sievers | 88bfa32 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 1090 | |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1091 | static struct module_attribute *modinfo_attrs[] = { |
Kay Sievers | cca3e70 | 2012-01-13 09:32:15 +1030 | [diff] [blame] | 1092 | &module_uevent, |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1093 | &modinfo_version, |
| 1094 | &modinfo_srcversion, |
Kay Sievers | cca3e70 | 2012-01-13 09:32:15 +1030 | [diff] [blame] | 1095 | &modinfo_initstate, |
| 1096 | &modinfo_coresize, |
| 1097 | &modinfo_initsize, |
| 1098 | &modinfo_taint, |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1099 | #ifdef CONFIG_MODULE_UNLOAD |
Kay Sievers | cca3e70 | 2012-01-13 09:32:15 +1030 | [diff] [blame] | 1100 | &modinfo_refcnt, |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1101 | #endif |
| 1102 | NULL, |
| 1103 | }; |
| 1104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | static const char vermagic[] = VERMAGIC_STRING; |
| 1106 | |
Rusty Russell | c6e665c | 2009-03-31 13:05:33 -0600 | [diff] [blame] | 1107 | static int try_to_force_load(struct module *mod, const char *reason) |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1108 | { |
| 1109 | #ifdef CONFIG_MODULE_FORCE_LOAD |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 1110 | if (!test_taint(TAINT_FORCED_MODULE)) |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 1111 | pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 1112 | add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1113 | return 0; |
| 1114 | #else |
| 1115 | return -ENOEXEC; |
| 1116 | #endif |
| 1117 | } |
| 1118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | #ifdef CONFIG_MODVERSIONS |
Rusty Russell | d4703ae | 2009-12-15 16:28:32 -0600 | [diff] [blame] | 1120 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
| 1121 | static unsigned long maybe_relocated(unsigned long crc, |
| 1122 | const struct module *crc_owner) |
| 1123 | { |
| 1124 | #ifdef ARCH_RELOCATES_KCRCTAB |
| 1125 | if (crc_owner == NULL) |
| 1126 | return crc - (unsigned long)reloc_start; |
| 1127 | #endif |
| 1128 | return crc; |
| 1129 | } |
| 1130 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | static int check_version(Elf_Shdr *sechdrs, |
| 1132 | unsigned int versindex, |
| 1133 | const char *symname, |
| 1134 | struct module *mod, |
Rusty Russell | d4703ae | 2009-12-15 16:28:32 -0600 | [diff] [blame] | 1135 | const unsigned long *crc, |
| 1136 | const struct module *crc_owner) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | { |
| 1138 | unsigned int i, num_versions; |
| 1139 | struct modversion_info *versions; |
| 1140 | |
| 1141 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ |
| 1142 | if (!crc) |
| 1143 | return 1; |
| 1144 | |
Rusty Russell | a5dd697 | 2008-05-09 16:24:21 +1000 | [diff] [blame] | 1145 | /* No versions at all? modprobe --force does this. */ |
| 1146 | if (versindex == 0) |
| 1147 | return try_to_force_load(mod, symname) == 0; |
| 1148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | versions = (void *) sechdrs[versindex].sh_addr; |
| 1150 | num_versions = sechdrs[versindex].sh_size |
| 1151 | / sizeof(struct modversion_info); |
| 1152 | |
| 1153 | for (i = 0; i < num_versions; i++) { |
| 1154 | if (strcmp(versions[i].name, symname) != 0) |
| 1155 | continue; |
| 1156 | |
Rusty Russell | d4703ae | 2009-12-15 16:28:32 -0600 | [diff] [blame] | 1157 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | return 1; |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 1159 | pr_debug("Found checksum %lX vs module %lX\n", |
Rusty Russell | d4703ae | 2009-12-15 16:28:32 -0600 | [diff] [blame] | 1160 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1161 | goto bad_version; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | } |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1163 | |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 1164 | pr_warn("%s: no symbol version for %s\n", mod->name, symname); |
Rusty Russell | a5dd697 | 2008-05-09 16:24:21 +1000 | [diff] [blame] | 1165 | return 0; |
Linus Torvalds | 826e450 | 2008-05-04 17:04:16 -0700 | [diff] [blame] | 1166 | |
| 1167 | bad_version: |
| 1168 | printk("%s: disagrees about version of symbol %s\n", |
| 1169 | mod->name, symname); |
| 1170 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | } |
| 1172 | |
| 1173 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
| 1174 | unsigned int versindex, |
| 1175 | struct module *mod) |
| 1176 | { |
| 1177 | const unsigned long *crc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1179 | /* Since this should be found in kernel (which can't be removed), |
| 1180 | * no locking is necessary. */ |
Rusty Russell | b92021b | 2013-03-15 15:04:17 +1030 | [diff] [blame] | 1181 | if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
Mike Frysinger | 6560dc1 | 2009-07-23 23:42:08 +0930 | [diff] [blame] | 1182 | &crc, true, false)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | BUG(); |
James Hogan | a4b6a77 | 2013-03-18 19:38:56 +1030 | [diff] [blame] | 1184 | return check_version(sechdrs, versindex, |
| 1185 | VMLINUX_SYMBOL_STR(module_layout), mod, crc, |
Rusty Russell | d4703ae | 2009-12-15 16:28:32 -0600 | [diff] [blame] | 1186 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | } |
| 1188 | |
Rusty Russell | 91e37a7 | 2008-05-09 16:25:28 +1000 | [diff] [blame] | 1189 | /* First part is kernel version, which we ignore if module has crcs. */ |
| 1190 | static inline int same_magic(const char *amagic, const char *bmagic, |
| 1191 | bool has_crcs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | { |
Rusty Russell | 91e37a7 | 2008-05-09 16:25:28 +1000 | [diff] [blame] | 1193 | if (has_crcs) { |
| 1194 | amagic += strcspn(amagic, " "); |
| 1195 | bmagic += strcspn(bmagic, " "); |
| 1196 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | return strcmp(amagic, bmagic) == 0; |
| 1198 | } |
| 1199 | #else |
| 1200 | static inline int check_version(Elf_Shdr *sechdrs, |
| 1201 | unsigned int versindex, |
| 1202 | const char *symname, |
| 1203 | struct module *mod, |
Rusty Russell | d4703ae | 2009-12-15 16:28:32 -0600 | [diff] [blame] | 1204 | const unsigned long *crc, |
| 1205 | const struct module *crc_owner) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | { |
| 1207 | return 1; |
| 1208 | } |
| 1209 | |
| 1210 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
| 1211 | unsigned int versindex, |
| 1212 | struct module *mod) |
| 1213 | { |
| 1214 | return 1; |
| 1215 | } |
| 1216 | |
Rusty Russell | 91e37a7 | 2008-05-09 16:25:28 +1000 | [diff] [blame] | 1217 | static inline int same_magic(const char *amagic, const char *bmagic, |
| 1218 | bool has_crcs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | { |
| 1220 | return strcmp(amagic, bmagic) == 0; |
| 1221 | } |
| 1222 | #endif /* CONFIG_MODVERSIONS */ |
| 1223 | |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1224 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1225 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
| 1226 | const struct load_info *info, |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1227 | const char *name, |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1228 | char ownername[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | { |
| 1230 | struct module *owner; |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1231 | const struct kernel_symbol *sym; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | const unsigned long *crc; |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1233 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1235 | mutex_lock(&module_mutex); |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1236 | sym = find_symbol(name, &owner, &crc, |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 1237 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1238 | if (!sym) |
| 1239 | goto unlock; |
| 1240 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1241 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, |
| 1242 | owner)) { |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1243 | sym = ERR_PTR(-EINVAL); |
| 1244 | goto getname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | } |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1246 | |
| 1247 | err = ref_module(mod, owner); |
| 1248 | if (err) { |
| 1249 | sym = ERR_PTR(err); |
| 1250 | goto getname; |
| 1251 | } |
| 1252 | |
| 1253 | getname: |
| 1254 | /* We must make copy under the lock if we failed to get ref. */ |
| 1255 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); |
| 1256 | unlock: |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1257 | mutex_unlock(&module_mutex); |
Linus Torvalds | 218ce73 | 2010-05-25 16:48:30 -0700 | [diff] [blame] | 1258 | return sym; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | } |
| 1260 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1261 | static const struct kernel_symbol * |
| 1262 | resolve_symbol_wait(struct module *mod, |
| 1263 | const struct load_info *info, |
| 1264 | const char *name) |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1265 | { |
| 1266 | const struct kernel_symbol *ksym; |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1267 | char owner[MODULE_NAME_LEN]; |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1268 | |
| 1269 | if (wait_event_interruptible_timeout(module_wq, |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1270 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
| 1271 | || PTR_ERR(ksym) != -EBUSY, |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1272 | 30 * HZ) <= 0) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 1273 | pr_warn("%s: gave up waiting for init of module %s.\n", |
| 1274 | mod->name, owner); |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1275 | } |
| 1276 | return ksym; |
| 1277 | } |
| 1278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | /* |
| 1280 | * /sys/module/foo/sections stuff |
| 1281 | * J. Corbet <corbet@lwn.net> |
| 1282 | */ |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1283 | #ifdef CONFIG_SYSFS |
Ben Hutchings | 10b465a | 2009-12-19 14:43:01 +0000 | [diff] [blame] | 1284 | |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1285 | #ifdef CONFIG_KALLSYMS |
Ben Hutchings | 10b465a | 2009-12-19 14:43:01 +0000 | [diff] [blame] | 1286 | static inline bool sect_empty(const Elf_Shdr *sect) |
| 1287 | { |
| 1288 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; |
| 1289 | } |
| 1290 | |
Rusty Russell | a58730c | 2008-03-13 09:03:44 +0000 | [diff] [blame] | 1291 | struct module_sect_attr |
| 1292 | { |
| 1293 | struct module_attribute mattr; |
| 1294 | char *name; |
| 1295 | unsigned long address; |
| 1296 | }; |
| 1297 | |
| 1298 | struct module_sect_attrs |
| 1299 | { |
| 1300 | struct attribute_group grp; |
| 1301 | unsigned int nsections; |
| 1302 | struct module_sect_attr attrs[0]; |
| 1303 | }; |
| 1304 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | static ssize_t module_sect_show(struct module_attribute *mattr, |
Kay Sievers | 4befb02 | 2011-07-24 22:06:04 +0930 | [diff] [blame] | 1306 | struct module_kobject *mk, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | { |
| 1308 | struct module_sect_attr *sattr = |
| 1309 | container_of(mattr, struct module_sect_attr, mattr); |
Kees Cook | 9f36e2c | 2011-03-22 16:34:22 -0700 | [diff] [blame] | 1310 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | } |
| 1312 | |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1313 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
| 1314 | { |
Rusty Russell | a58730c | 2008-03-13 09:03:44 +0000 | [diff] [blame] | 1315 | unsigned int section; |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1316 | |
| 1317 | for (section = 0; section < sect_attrs->nsections; section++) |
| 1318 | kfree(sect_attrs->attrs[section].name); |
| 1319 | kfree(sect_attrs); |
| 1320 | } |
| 1321 | |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1322 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | { |
| 1324 | unsigned int nloaded = 0, i, size[2]; |
| 1325 | struct module_sect_attrs *sect_attrs; |
| 1326 | struct module_sect_attr *sattr; |
| 1327 | struct attribute **gattr; |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 1328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | /* Count loaded sections and allocate structures */ |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1330 | for (i = 0; i < info->hdr->e_shnum; i++) |
| 1331 | if (!sect_empty(&info->sechdrs[i])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | nloaded++; |
| 1333 | size[0] = ALIGN(sizeof(*sect_attrs) |
| 1334 | + nloaded * sizeof(sect_attrs->attrs[0]), |
| 1335 | sizeof(sect_attrs->grp.attrs[0])); |
| 1336 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1337 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
| 1338 | if (sect_attrs == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | return; |
| 1340 | |
| 1341 | /* Setup section attributes. */ |
| 1342 | sect_attrs->grp.name = "sections"; |
| 1343 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; |
| 1344 | |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1345 | sect_attrs->nsections = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | sattr = §_attrs->attrs[0]; |
| 1347 | gattr = §_attrs->grp.attrs[0]; |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1348 | for (i = 0; i < info->hdr->e_shnum; i++) { |
| 1349 | Elf_Shdr *sec = &info->sechdrs[i]; |
| 1350 | if (sect_empty(sec)) |
Helge Deller | 35dead4 | 2009-12-03 00:29:15 +0100 | [diff] [blame] | 1351 | continue; |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1352 | sattr->address = sec->sh_addr; |
| 1353 | sattr->name = kstrdup(info->secstrings + sec->sh_name, |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1354 | GFP_KERNEL); |
| 1355 | if (sattr->name == NULL) |
| 1356 | goto out; |
| 1357 | sect_attrs->nsections++; |
Eric W. Biederman | 361795b | 2010-02-12 13:41:56 -0800 | [diff] [blame] | 1358 | sysfs_attr_init(&sattr->mattr.attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | sattr->mattr.show = module_sect_show; |
| 1360 | sattr->mattr.store = NULL; |
| 1361 | sattr->mattr.attr.name = sattr->name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | sattr->mattr.attr.mode = S_IRUGO; |
| 1363 | *(gattr++) = &(sattr++)->mattr.attr; |
| 1364 | } |
| 1365 | *gattr = NULL; |
| 1366 | |
| 1367 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) |
| 1368 | goto out; |
| 1369 | |
| 1370 | mod->sect_attrs = sect_attrs; |
| 1371 | return; |
| 1372 | out: |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1373 | free_sect_attrs(sect_attrs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | } |
| 1375 | |
| 1376 | static void remove_sect_attrs(struct module *mod) |
| 1377 | { |
| 1378 | if (mod->sect_attrs) { |
| 1379 | sysfs_remove_group(&mod->mkobj.kobj, |
| 1380 | &mod->sect_attrs->grp); |
| 1381 | /* We are positive that no one is using any sect attrs |
| 1382 | * at this point. Deallocate immediately. */ |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1383 | free_sect_attrs(mod->sect_attrs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | mod->sect_attrs = NULL; |
| 1385 | } |
| 1386 | } |
| 1387 | |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1388 | /* |
| 1389 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. |
| 1390 | */ |
| 1391 | |
| 1392 | struct module_notes_attrs { |
| 1393 | struct kobject *dir; |
| 1394 | unsigned int notes; |
| 1395 | struct bin_attribute attrs[0]; |
| 1396 | }; |
| 1397 | |
Chris Wright | 2c3c8be | 2010-05-12 18:28:57 -0700 | [diff] [blame] | 1398 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1399 | struct bin_attribute *bin_attr, |
| 1400 | char *buf, loff_t pos, size_t count) |
| 1401 | { |
| 1402 | /* |
| 1403 | * The caller checked the pos and count against our size. |
| 1404 | */ |
| 1405 | memcpy(buf, bin_attr->private + pos, count); |
| 1406 | return count; |
| 1407 | } |
| 1408 | |
| 1409 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, |
| 1410 | unsigned int i) |
| 1411 | { |
| 1412 | if (notes_attrs->dir) { |
| 1413 | while (i-- > 0) |
| 1414 | sysfs_remove_bin_file(notes_attrs->dir, |
| 1415 | ¬es_attrs->attrs[i]); |
Alexey Dobriyan | e943209 | 2008-09-23 23:51:11 +0400 | [diff] [blame] | 1416 | kobject_put(notes_attrs->dir); |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1417 | } |
| 1418 | kfree(notes_attrs); |
| 1419 | } |
| 1420 | |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1421 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1422 | { |
| 1423 | unsigned int notes, loaded, i; |
| 1424 | struct module_notes_attrs *notes_attrs; |
| 1425 | struct bin_attribute *nattr; |
| 1426 | |
Ingo Molnar | ea6bff3 | 2009-08-28 10:44:56 +0200 | [diff] [blame] | 1427 | /* failed to create section attributes, so can't create notes */ |
| 1428 | if (!mod->sect_attrs) |
| 1429 | return; |
| 1430 | |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1431 | /* Count notes sections and allocate structures. */ |
| 1432 | notes = 0; |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1433 | for (i = 0; i < info->hdr->e_shnum; i++) |
| 1434 | if (!sect_empty(&info->sechdrs[i]) && |
| 1435 | (info->sechdrs[i].sh_type == SHT_NOTE)) |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1436 | ++notes; |
| 1437 | |
| 1438 | if (notes == 0) |
| 1439 | return; |
| 1440 | |
| 1441 | notes_attrs = kzalloc(sizeof(*notes_attrs) |
| 1442 | + notes * sizeof(notes_attrs->attrs[0]), |
| 1443 | GFP_KERNEL); |
| 1444 | if (notes_attrs == NULL) |
| 1445 | return; |
| 1446 | |
| 1447 | notes_attrs->notes = notes; |
| 1448 | nattr = ¬es_attrs->attrs[0]; |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1449 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
| 1450 | if (sect_empty(&info->sechdrs[i])) |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1451 | continue; |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1452 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
Eric W. Biederman | 361795b | 2010-02-12 13:41:56 -0800 | [diff] [blame] | 1453 | sysfs_bin_attr_init(nattr); |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1454 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
| 1455 | nattr->attr.mode = S_IRUGO; |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1456 | nattr->size = info->sechdrs[i].sh_size; |
| 1457 | nattr->private = (void *) info->sechdrs[i].sh_addr; |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1458 | nattr->read = module_notes_read; |
| 1459 | ++nattr; |
| 1460 | } |
| 1461 | ++loaded; |
| 1462 | } |
| 1463 | |
Greg Kroah-Hartman | 4ff6abf | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 1464 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1465 | if (!notes_attrs->dir) |
| 1466 | goto out; |
| 1467 | |
| 1468 | for (i = 0; i < notes; ++i) |
| 1469 | if (sysfs_create_bin_file(notes_attrs->dir, |
| 1470 | ¬es_attrs->attrs[i])) |
| 1471 | goto out; |
| 1472 | |
| 1473 | mod->notes_attrs = notes_attrs; |
| 1474 | return; |
| 1475 | |
| 1476 | out: |
| 1477 | free_notes_attrs(notes_attrs, i); |
| 1478 | } |
| 1479 | |
| 1480 | static void remove_notes_attrs(struct module *mod) |
| 1481 | { |
| 1482 | if (mod->notes_attrs) |
| 1483 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); |
| 1484 | } |
| 1485 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | #else |
Ian S. Nelson | 04b1db9 | 2006-09-29 02:01:31 -0700 | [diff] [blame] | 1487 | |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1488 | static inline void add_sect_attrs(struct module *mod, |
| 1489 | const struct load_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | { |
| 1491 | } |
| 1492 | |
| 1493 | static inline void remove_sect_attrs(struct module *mod) |
| 1494 | { |
| 1495 | } |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1496 | |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1497 | static inline void add_notes_attrs(struct module *mod, |
| 1498 | const struct load_info *info) |
Roland McGrath | 6d76013 | 2007-10-16 23:26:40 -0700 | [diff] [blame] | 1499 | { |
| 1500 | } |
| 1501 | |
| 1502 | static inline void remove_notes_attrs(struct module *mod) |
| 1503 | { |
| 1504 | } |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1505 | #endif /* CONFIG_KALLSYMS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | |
Rusty Russell | 80a3d1b | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1507 | static void add_usage_links(struct module *mod) |
| 1508 | { |
| 1509 | #ifdef CONFIG_MODULE_UNLOAD |
| 1510 | struct module_use *use; |
| 1511 | int nowarn; |
| 1512 | |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1513 | mutex_lock(&module_mutex); |
Rusty Russell | 80a3d1b | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1514 | list_for_each_entry(use, &mod->target_list, target_list) { |
| 1515 | nowarn = sysfs_create_link(use->target->holders_dir, |
| 1516 | &mod->mkobj.kobj, mod->name); |
| 1517 | } |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1518 | mutex_unlock(&module_mutex); |
Rusty Russell | 80a3d1b | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1519 | #endif |
| 1520 | } |
| 1521 | |
| 1522 | static void del_usage_links(struct module *mod) |
| 1523 | { |
| 1524 | #ifdef CONFIG_MODULE_UNLOAD |
| 1525 | struct module_use *use; |
| 1526 | |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1527 | mutex_lock(&module_mutex); |
Rusty Russell | 80a3d1b | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1528 | list_for_each_entry(use, &mod->target_list, target_list) |
| 1529 | sysfs_remove_link(use->target->holders_dir, mod->name); |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1530 | mutex_unlock(&module_mutex); |
Rusty Russell | 80a3d1b | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1531 | #endif |
| 1532 | } |
| 1533 | |
Rusty Russell | 6407ebb2 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1534 | static int module_add_modinfo_attrs(struct module *mod) |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1535 | { |
| 1536 | struct module_attribute *attr; |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1537 | struct module_attribute *temp_attr; |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1538 | int error = 0; |
| 1539 | int i; |
| 1540 | |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1541 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
| 1542 | (ARRAY_SIZE(modinfo_attrs) + 1)), |
| 1543 | GFP_KERNEL); |
| 1544 | if (!mod->modinfo_attrs) |
| 1545 | return -ENOMEM; |
| 1546 | |
| 1547 | temp_attr = mod->modinfo_attrs; |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1548 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
| 1549 | if (!attr->test || |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1550 | (attr->test && attr->test(mod))) { |
| 1551 | memcpy(temp_attr, attr, sizeof(*temp_attr)); |
Eric W. Biederman | 361795b | 2010-02-12 13:41:56 -0800 | [diff] [blame] | 1552 | sysfs_attr_init(&temp_attr->attr); |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1553 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
| 1554 | ++temp_attr; |
| 1555 | } |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1556 | } |
| 1557 | return error; |
| 1558 | } |
| 1559 | |
Rusty Russell | 6407ebb2 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1560 | static void module_remove_modinfo_attrs(struct module *mod) |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1561 | { |
| 1562 | struct module_attribute *attr; |
| 1563 | int i; |
| 1564 | |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1565 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
| 1566 | /* pick a field to test for end of list */ |
| 1567 | if (!attr->attr.name) |
| 1568 | break; |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1569 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1570 | if (attr->free) |
| 1571 | attr->free(mod); |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1572 | } |
Greg Kroah-Hartman | 03e88ae1 | 2006-02-16 13:50:23 -0800 | [diff] [blame] | 1573 | kfree(mod->modinfo_attrs); |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1574 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | |
Li Zhong | 942e443 | 2013-09-03 16:33:57 +0930 | [diff] [blame] | 1576 | static void mod_kobject_put(struct module *mod) |
| 1577 | { |
| 1578 | DECLARE_COMPLETION_ONSTACK(c); |
| 1579 | mod->mkobj.kobj_completion = &c; |
| 1580 | kobject_put(&mod->mkobj.kobj); |
| 1581 | wait_for_completion(&c); |
| 1582 | } |
| 1583 | |
Rusty Russell | 6407ebb2 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1584 | static int mod_sysfs_init(struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | { |
| 1586 | int err; |
Greg Kroah-Hartman | 6494a93 | 2008-01-27 15:38:40 -0800 | [diff] [blame] | 1587 | struct kobject *kobj; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 1589 | if (!module_sysfs_initialized) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 1590 | pr_err("%s: module sysfs not initialized\n", mod->name); |
Ed Swierk | 1cc5f71 | 2006-09-25 16:25:36 -0700 | [diff] [blame] | 1591 | err = -EINVAL; |
| 1592 | goto out; |
| 1593 | } |
Greg Kroah-Hartman | 6494a93 | 2008-01-27 15:38:40 -0800 | [diff] [blame] | 1594 | |
| 1595 | kobj = kset_find_obj(module_kset, mod->name); |
| 1596 | if (kobj) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 1597 | pr_err("%s: module is already loaded\n", mod->name); |
Greg Kroah-Hartman | 6494a93 | 2008-01-27 15:38:40 -0800 | [diff] [blame] | 1598 | kobject_put(kobj); |
| 1599 | err = -EINVAL; |
| 1600 | goto out; |
| 1601 | } |
| 1602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | mod->mkobj.mod = mod; |
Kay Sievers | e17e0f5 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1604 | |
Greg Kroah-Hartman | ac3c814 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 1605 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
| 1606 | mod->mkobj.kobj.kset = module_kset; |
| 1607 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, |
| 1608 | "%s", mod->name); |
| 1609 | if (err) |
Li Zhong | 942e443 | 2013-09-03 16:33:57 +0930 | [diff] [blame] | 1610 | mod_kobject_put(mod); |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1611 | |
Kay Sievers | 97c146e | 2007-11-29 23:46:11 +0100 | [diff] [blame] | 1612 | /* delay uevent until full sysfs population */ |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1613 | out: |
| 1614 | return err; |
| 1615 | } |
| 1616 | |
Rusty Russell | 6407ebb2 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1617 | static int mod_sysfs_setup(struct module *mod, |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1618 | const struct load_info *info, |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1619 | struct kernel_param *kparam, |
| 1620 | unsigned int num_params) |
| 1621 | { |
| 1622 | int err; |
| 1623 | |
Rusty Russell | 80a3d1b | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1624 | err = mod_sysfs_init(mod); |
| 1625 | if (err) |
| 1626 | goto out; |
| 1627 | |
Greg Kroah-Hartman | 4ff6abf | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 1628 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
Akinobu Mita | 240936e | 2007-04-26 00:12:09 -0700 | [diff] [blame] | 1629 | if (!mod->holders_dir) { |
| 1630 | err = -ENOMEM; |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1631 | goto out_unreg; |
Akinobu Mita | 240936e | 2007-04-26 00:12:09 -0700 | [diff] [blame] | 1632 | } |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | err = module_param_sysfs_setup(mod, kparam, num_params); |
| 1635 | if (err) |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1636 | goto out_unreg_holders; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1638 | err = module_add_modinfo_attrs(mod); |
| 1639 | if (err) |
Kay Sievers | e17e0f5 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1640 | goto out_unreg_param; |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1641 | |
Rusty Russell | 80a3d1b | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1642 | add_usage_links(mod); |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1643 | add_sect_attrs(mod, info); |
| 1644 | add_notes_attrs(mod, info); |
Rusty Russell | 80a3d1b | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1645 | |
Kay Sievers | e17e0f5 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1646 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | return 0; |
| 1648 | |
Kay Sievers | e17e0f5 | 2006-11-24 12:15:25 +0100 | [diff] [blame] | 1649 | out_unreg_param: |
| 1650 | module_param_sysfs_remove(mod); |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1651 | out_unreg_holders: |
Greg Kroah-Hartman | 78a2d90 | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 1652 | kobject_put(mod->holders_dir); |
Kay Sievers | 270a6c4 | 2007-01-18 13:26:15 +0100 | [diff] [blame] | 1653 | out_unreg: |
Li Zhong | 942e443 | 2013-09-03 16:33:57 +0930 | [diff] [blame] | 1654 | mod_kobject_put(mod); |
Rusty Russell | 80a3d1b | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1655 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | return err; |
| 1657 | } |
Denis V. Lunev | 34e4e2f | 2008-05-20 13:59:48 +0400 | [diff] [blame] | 1658 | |
| 1659 | static void mod_sysfs_fini(struct module *mod) |
| 1660 | { |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1661 | remove_notes_attrs(mod); |
| 1662 | remove_sect_attrs(mod); |
Li Zhong | 942e443 | 2013-09-03 16:33:57 +0930 | [diff] [blame] | 1663 | mod_kobject_put(mod); |
Denis V. Lunev | 34e4e2f | 2008-05-20 13:59:48 +0400 | [diff] [blame] | 1664 | } |
| 1665 | |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1666 | #else /* !CONFIG_SYSFS */ |
Denis V. Lunev | 34e4e2f | 2008-05-20 13:59:48 +0400 | [diff] [blame] | 1667 | |
Rusty Russell | 8f6d037 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1668 | static int mod_sysfs_setup(struct module *mod, |
| 1669 | const struct load_info *info, |
Rusty Russell | 6407ebb2 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1670 | struct kernel_param *kparam, |
| 1671 | unsigned int num_params) |
| 1672 | { |
| 1673 | return 0; |
| 1674 | } |
| 1675 | |
Denis V. Lunev | 34e4e2f | 2008-05-20 13:59:48 +0400 | [diff] [blame] | 1676 | static void mod_sysfs_fini(struct module *mod) |
| 1677 | { |
| 1678 | } |
| 1679 | |
Rusty Russell | 36b0360 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1680 | static void module_remove_modinfo_attrs(struct module *mod) |
| 1681 | { |
| 1682 | } |
| 1683 | |
Rusty Russell | 80a3d1b | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1684 | static void del_usage_links(struct module *mod) |
| 1685 | { |
| 1686 | } |
| 1687 | |
Denis V. Lunev | 34e4e2f | 2008-05-20 13:59:48 +0400 | [diff] [blame] | 1688 | #endif /* CONFIG_SYSFS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | |
Rusty Russell | 36b0360 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1690 | static void mod_sysfs_teardown(struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | { |
Rusty Russell | 80a3d1b | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1692 | del_usage_links(mod); |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 1693 | module_remove_modinfo_attrs(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | module_param_sysfs_remove(mod); |
Greg Kroah-Hartman | 78a2d90 | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 1695 | kobject_put(mod->mkobj.drivers_dir); |
| 1696 | kobject_put(mod->holders_dir); |
Denis V. Lunev | 34e4e2f | 2008-05-20 13:59:48 +0400 | [diff] [blame] | 1697 | mod_sysfs_fini(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | } |
| 1699 | |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 1700 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
| 1701 | /* |
| 1702 | * LKM RO/NX protection: protect module's text/ro-data |
| 1703 | * from modification and any data from execution. |
| 1704 | */ |
| 1705 | void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages)) |
| 1706 | { |
| 1707 | unsigned long begin_pfn = PFN_DOWN((unsigned long)start); |
| 1708 | unsigned long end_pfn = PFN_DOWN((unsigned long)end); |
| 1709 | |
| 1710 | if (end_pfn > begin_pfn) |
| 1711 | set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); |
| 1712 | } |
| 1713 | |
| 1714 | static void set_section_ro_nx(void *base, |
| 1715 | unsigned long text_size, |
| 1716 | unsigned long ro_size, |
| 1717 | unsigned long total_size) |
| 1718 | { |
| 1719 | /* begin and end PFNs of the current subsection */ |
| 1720 | unsigned long begin_pfn; |
| 1721 | unsigned long end_pfn; |
| 1722 | |
| 1723 | /* |
| 1724 | * Set RO for module text and RO-data: |
| 1725 | * - Always protect first page. |
| 1726 | * - Do not protect last partial page. |
| 1727 | */ |
| 1728 | if (ro_size > 0) |
| 1729 | set_page_attributes(base, base + ro_size, set_memory_ro); |
| 1730 | |
| 1731 | /* |
| 1732 | * Set NX permissions for module data: |
| 1733 | * - Do not protect first partial page. |
| 1734 | * - Always protect last page. |
| 1735 | */ |
| 1736 | if (total_size > text_size) { |
| 1737 | begin_pfn = PFN_UP((unsigned long)base + text_size); |
| 1738 | end_pfn = PFN_UP((unsigned long)base + total_size); |
| 1739 | if (end_pfn > begin_pfn) |
| 1740 | set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); |
| 1741 | } |
| 1742 | } |
| 1743 | |
Jan Glauber | 01526ed | 2011-05-19 16:55:26 -0600 | [diff] [blame] | 1744 | static void unset_module_core_ro_nx(struct module *mod) |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 1745 | { |
Jan Glauber | 01526ed | 2011-05-19 16:55:26 -0600 | [diff] [blame] | 1746 | set_page_attributes(mod->module_core + mod->core_text_size, |
| 1747 | mod->module_core + mod->core_size, |
| 1748 | set_memory_x); |
| 1749 | set_page_attributes(mod->module_core, |
| 1750 | mod->module_core + mod->core_ro_size, |
| 1751 | set_memory_rw); |
| 1752 | } |
| 1753 | |
| 1754 | static void unset_module_init_ro_nx(struct module *mod) |
| 1755 | { |
| 1756 | set_page_attributes(mod->module_init + mod->init_text_size, |
| 1757 | mod->module_init + mod->init_size, |
| 1758 | set_memory_x); |
| 1759 | set_page_attributes(mod->module_init, |
| 1760 | mod->module_init + mod->init_ro_size, |
| 1761 | set_memory_rw); |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 1762 | } |
| 1763 | |
| 1764 | /* Iterate through all modules and set each module's text as RW */ |
Daniel J Blueman | 5d05c70 | 2011-03-08 22:01:47 +0800 | [diff] [blame] | 1765 | void set_all_modules_text_rw(void) |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 1766 | { |
| 1767 | struct module *mod; |
| 1768 | |
| 1769 | mutex_lock(&module_mutex); |
| 1770 | list_for_each_entry_rcu(mod, &modules, list) { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 1771 | if (mod->state == MODULE_STATE_UNFORMED) |
| 1772 | continue; |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 1773 | if ((mod->module_core) && (mod->core_text_size)) { |
| 1774 | set_page_attributes(mod->module_core, |
| 1775 | mod->module_core + mod->core_text_size, |
| 1776 | set_memory_rw); |
| 1777 | } |
| 1778 | if ((mod->module_init) && (mod->init_text_size)) { |
| 1779 | set_page_attributes(mod->module_init, |
| 1780 | mod->module_init + mod->init_text_size, |
| 1781 | set_memory_rw); |
| 1782 | } |
| 1783 | } |
| 1784 | mutex_unlock(&module_mutex); |
| 1785 | } |
| 1786 | |
| 1787 | /* Iterate through all modules and set each module's text as RO */ |
Daniel J Blueman | 5d05c70 | 2011-03-08 22:01:47 +0800 | [diff] [blame] | 1788 | void set_all_modules_text_ro(void) |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 1789 | { |
| 1790 | struct module *mod; |
| 1791 | |
| 1792 | mutex_lock(&module_mutex); |
| 1793 | list_for_each_entry_rcu(mod, &modules, list) { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 1794 | if (mod->state == MODULE_STATE_UNFORMED) |
| 1795 | continue; |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 1796 | if ((mod->module_core) && (mod->core_text_size)) { |
| 1797 | set_page_attributes(mod->module_core, |
| 1798 | mod->module_core + mod->core_text_size, |
| 1799 | set_memory_ro); |
| 1800 | } |
| 1801 | if ((mod->module_init) && (mod->init_text_size)) { |
| 1802 | set_page_attributes(mod->module_init, |
| 1803 | mod->module_init + mod->init_text_size, |
| 1804 | set_memory_ro); |
| 1805 | } |
| 1806 | } |
| 1807 | mutex_unlock(&module_mutex); |
| 1808 | } |
| 1809 | #else |
| 1810 | static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { } |
Jan Glauber | 01526ed | 2011-05-19 16:55:26 -0600 | [diff] [blame] | 1811 | static void unset_module_core_ro_nx(struct module *mod) { } |
| 1812 | static void unset_module_init_ro_nx(struct module *mod) { } |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 1813 | #endif |
| 1814 | |
Jonas Bonn | 74e08fc | 2011-06-30 21:22:11 +0200 | [diff] [blame] | 1815 | void __weak module_free(struct module *mod, void *module_region) |
| 1816 | { |
| 1817 | vfree(module_region); |
| 1818 | } |
| 1819 | |
| 1820 | void __weak module_arch_cleanup(struct module *mod) |
| 1821 | { |
| 1822 | } |
| 1823 | |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 1824 | /* Free a module, remove from lists, etc. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | static void free_module(struct module *mod) |
| 1826 | { |
Li Zefan | 7ead8b8 | 2009-08-17 16:56:28 +0800 | [diff] [blame] | 1827 | trace_module_free(mod); |
| 1828 | |
Rusty Russell | 36b0360 | 2010-08-05 12:59:09 -0600 | [diff] [blame] | 1829 | mod_sysfs_teardown(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1830 | |
Rusty Russell | 944a1fa | 2013-04-17 13:20:03 +0930 | [diff] [blame] | 1831 | /* We leave it in list to prevent duplicate loads, but make sure |
| 1832 | * that noone uses it while it's being deconstructed. */ |
Prarit Bhargava | d3051b4 | 2014-10-14 02:51:39 +1030 | [diff] [blame] | 1833 | mutex_lock(&module_mutex); |
Rusty Russell | 944a1fa | 2013-04-17 13:20:03 +0930 | [diff] [blame] | 1834 | mod->state = MODULE_STATE_UNFORMED; |
Prarit Bhargava | d3051b4 | 2014-10-14 02:51:39 +1030 | [diff] [blame] | 1835 | mutex_unlock(&module_mutex); |
Rusty Russell | 944a1fa | 2013-04-17 13:20:03 +0930 | [diff] [blame] | 1836 | |
Jason Baron | b82bab4b | 2010-07-27 13:18:01 -0700 | [diff] [blame] | 1837 | /* Remove dynamic debug info */ |
| 1838 | ddebug_remove_module(mod->name); |
| 1839 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | /* Arch-specific cleanup. */ |
| 1841 | module_arch_cleanup(mod); |
| 1842 | |
| 1843 | /* Module unload stuff */ |
| 1844 | module_unload_free(mod); |
| 1845 | |
Rusty Russell | e180a6b | 2009-03-31 13:05:29 -0600 | [diff] [blame] | 1846 | /* Free any allocated parameters. */ |
| 1847 | destroy_params(mod->kp, mod->num_kp); |
| 1848 | |
Rusty Russell | 944a1fa | 2013-04-17 13:20:03 +0930 | [diff] [blame] | 1849 | /* Now we can delete it from the lists */ |
| 1850 | mutex_lock(&module_mutex); |
Masami Hiramatsu | 461e34a | 2014-11-10 09:27:29 +1030 | [diff] [blame^] | 1851 | /* Unlink carefully: kallsyms could be walking list. */ |
| 1852 | list_del_rcu(&mod->list); |
| 1853 | /* Wait for RCU synchronizing before releasing mod->list. */ |
| 1854 | synchronize_rcu(); |
| 1855 | module_bug_cleanup(mod); |
Rusty Russell | 944a1fa | 2013-04-17 13:20:03 +0930 | [diff] [blame] | 1856 | mutex_unlock(&module_mutex); |
| 1857 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | /* This may be NULL, but that's OK */ |
Jan Glauber | 01526ed | 2011-05-19 16:55:26 -0600 | [diff] [blame] | 1859 | unset_module_init_ro_nx(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | module_free(mod, mod->module_init); |
| 1861 | kfree(mod->args); |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 1862 | percpu_modfree(mod); |
Rusty Russell | 9f85a4b | 2010-08-05 12:59:04 -0600 | [diff] [blame] | 1863 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1864 | /* Free lock-classes: */ |
| 1865 | lockdep_free_key_range(mod->module_core, mod->core_size); |
| 1866 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | /* Finally, free the core (containing the module structure) */ |
Jan Glauber | 01526ed | 2011-05-19 16:55:26 -0600 | [diff] [blame] | 1868 | unset_module_core_ro_nx(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | module_free(mod, mod->module_core); |
Bernd Schmidt | eb8cdec | 2009-09-21 17:03:57 -0700 | [diff] [blame] | 1870 | |
| 1871 | #ifdef CONFIG_MPU |
| 1872 | update_protections(current->mm); |
| 1873 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | } |
| 1875 | |
| 1876 | void *__symbol_get(const char *symbol) |
| 1877 | { |
| 1878 | struct module *owner; |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1879 | const struct kernel_symbol *sym; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 1881 | preempt_disable(); |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1882 | sym = find_symbol(symbol, &owner, NULL, true, true); |
| 1883 | if (sym && strong_try_module_get(owner)) |
| 1884 | sym = NULL; |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 1885 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1887 | return sym ? (void *)sym->value : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1888 | } |
| 1889 | EXPORT_SYMBOL_GPL(__symbol_get); |
| 1890 | |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1891 | /* |
| 1892 | * Ensure that an exported symbol [global namespace] does not already exist |
Robert P. J. Day | 02a3e59 | 2007-05-09 07:26:28 +0200 | [diff] [blame] | 1893 | * in the kernel or in some other module's exported symbol table. |
Rusty Russell | be593f4 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1894 | * |
| 1895 | * You must hold the module_mutex. |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1896 | */ |
| 1897 | static int verify_export_symbols(struct module *mod) |
| 1898 | { |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1899 | unsigned int i; |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1900 | struct module *owner; |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1901 | const struct kernel_symbol *s; |
| 1902 | struct { |
| 1903 | const struct kernel_symbol *sym; |
| 1904 | unsigned int num; |
| 1905 | } arr[] = { |
| 1906 | { mod->syms, mod->num_syms }, |
| 1907 | { mod->gpl_syms, mod->num_gpl_syms }, |
| 1908 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 1909 | #ifdef CONFIG_UNUSED_SYMBOLS |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1910 | { mod->unused_syms, mod->num_unused_syms }, |
| 1911 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, |
Denys Vlasenko | f7f5b67 | 2008-07-22 19:24:26 -0500 | [diff] [blame] | 1912 | #endif |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1913 | }; |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1914 | |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1915 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
| 1916 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { |
Rusty Russell | be593f4 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1917 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 1918 | pr_err("%s: exports duplicate symbol %s" |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1919 | " (owned by %s)\n", |
| 1920 | mod->name, s->name, module_name(owner)); |
| 1921 | return -ENOEXEC; |
| 1922 | } |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1923 | } |
Rusty Russell | b211104 | 2008-05-01 21:15:00 -0500 | [diff] [blame] | 1924 | } |
| 1925 | return 0; |
Ashutosh Naik | eea8b54 | 2006-01-08 01:04:25 -0800 | [diff] [blame] | 1926 | } |
| 1927 | |
Matti Linnanvuori | 9a4b970 | 2007-11-08 08:37:38 -0800 | [diff] [blame] | 1928 | /* Change all symbols so that st_value encodes the pointer directly. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1929 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1930 | { |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1931 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
| 1932 | Elf_Sym *sym = (void *)symsec->sh_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1933 | unsigned long secbase; |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1934 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | int ret = 0; |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1936 | const struct kernel_symbol *ksym; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1938 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
| 1939 | const char *name = info->strtab + sym[i].st_name; |
| 1940 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | switch (sym[i].st_shndx) { |
| 1942 | case SHN_COMMON: |
Joe Mario | 8037598 | 2014-02-08 09:01:09 +0100 | [diff] [blame] | 1943 | /* Ignore common symbols */ |
| 1944 | if (!strncmp(name, "__gnu_lto", 9)) |
| 1945 | break; |
| 1946 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | /* We compiled with -fno-common. These are not |
| 1948 | supposed to happen. */ |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 1949 | pr_debug("Common symbol: %s\n", name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1950 | printk("%s: please compile with -fno-common\n", |
| 1951 | mod->name); |
| 1952 | ret = -ENOEXEC; |
| 1953 | break; |
| 1954 | |
| 1955 | case SHN_ABS: |
| 1956 | /* Don't need to do anything */ |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 1957 | pr_debug("Absolute symbol: 0x%08lx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | (long)sym[i].st_value); |
| 1959 | break; |
| 1960 | |
| 1961 | case SHN_UNDEF: |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1962 | ksym = resolve_symbol_wait(mod, info, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | /* Ok if resolved. */ |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1964 | if (ksym && !IS_ERR(ksym)) { |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1965 | sym[i].st_value = ksym->value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | break; |
Tim Abbott | 414fd31 | 2008-12-05 19:03:56 -0500 | [diff] [blame] | 1967 | } |
| 1968 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | /* Ok if weak. */ |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1970 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | break; |
| 1972 | |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 1973 | pr_warn("%s: Unknown symbol %s (err %li)\n", |
| 1974 | mod->name, name, PTR_ERR(ksym)); |
Rusty Russell | 9bea7f2 | 2010-06-05 11:17:37 -0600 | [diff] [blame] | 1975 | ret = PTR_ERR(ksym) ?: -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | break; |
| 1977 | |
| 1978 | default: |
| 1979 | /* Divert to percpu allocation if a percpu var. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1980 | if (sym[i].st_shndx == info->index.pcpu) |
Tejun Heo | 259354d | 2010-03-10 18:56:10 +0900 | [diff] [blame] | 1981 | secbase = (unsigned long)mod_percpu(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | else |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1983 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1984 | sym[i].st_value += secbase; |
| 1985 | break; |
| 1986 | } |
| 1987 | } |
| 1988 | |
| 1989 | return ret; |
| 1990 | } |
| 1991 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1992 | static int apply_relocations(struct module *mod, const struct load_info *info) |
Rusty Russell | 22e268e | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 1993 | { |
| 1994 | unsigned int i; |
| 1995 | int err = 0; |
| 1996 | |
| 1997 | /* Now do relocations. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 1998 | for (i = 1; i < info->hdr->e_shnum; i++) { |
| 1999 | unsigned int infosec = info->sechdrs[i].sh_info; |
Rusty Russell | 22e268e | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 2000 | |
| 2001 | /* Not a valid relocation section? */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2002 | if (infosec >= info->hdr->e_shnum) |
Rusty Russell | 22e268e | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 2003 | continue; |
| 2004 | |
| 2005 | /* Don't bother with non-allocated sections */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2006 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
Rusty Russell | 22e268e | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 2007 | continue; |
| 2008 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2009 | if (info->sechdrs[i].sh_type == SHT_REL) |
| 2010 | err = apply_relocate(info->sechdrs, info->strtab, |
| 2011 | info->index.sym, i, mod); |
| 2012 | else if (info->sechdrs[i].sh_type == SHT_RELA) |
| 2013 | err = apply_relocate_add(info->sechdrs, info->strtab, |
| 2014 | info->index.sym, i, mod); |
Rusty Russell | 22e268e | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 2015 | if (err < 0) |
| 2016 | break; |
| 2017 | } |
| 2018 | return err; |
| 2019 | } |
| 2020 | |
Helge Deller | 088af9a | 2008-12-31 12:31:18 +0100 | [diff] [blame] | 2021 | /* Additional bytes needed by arch in front of individual sections */ |
| 2022 | unsigned int __weak arch_mod_section_prepend(struct module *mod, |
| 2023 | unsigned int section) |
| 2024 | { |
| 2025 | /* default implementation just returns zero */ |
| 2026 | return 0; |
| 2027 | } |
| 2028 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2029 | /* Update size with this section: return offset. */ |
Helge Deller | 088af9a | 2008-12-31 12:31:18 +0100 | [diff] [blame] | 2030 | static long get_offset(struct module *mod, unsigned int *size, |
| 2031 | Elf_Shdr *sechdr, unsigned int section) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | { |
| 2033 | long ret; |
| 2034 | |
Helge Deller | 088af9a | 2008-12-31 12:31:18 +0100 | [diff] [blame] | 2035 | *size += arch_mod_section_prepend(mod, section); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
| 2037 | *size = ret + sechdr->sh_size; |
| 2038 | return ret; |
| 2039 | } |
| 2040 | |
| 2041 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld |
| 2042 | might -- code, read-only data, read-write data, small data. Tally |
| 2043 | sizes, and place the offsets into sh_entsize fields: high bit means it |
| 2044 | belongs in init. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2045 | static void layout_sections(struct module *mod, struct load_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | { |
| 2047 | static unsigned long const masks[][2] = { |
| 2048 | /* NOTE: all executable code must be the first section |
| 2049 | * in this array; otherwise modify the text_size |
| 2050 | * finder in the two loops below */ |
| 2051 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, |
| 2052 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, |
| 2053 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
| 2054 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } |
| 2055 | }; |
| 2056 | unsigned int m, i; |
| 2057 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2058 | for (i = 0; i < info->hdr->e_shnum; i++) |
| 2059 | info->sechdrs[i].sh_entsize = ~0UL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 2061 | pr_debug("Core section allocation order:\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2063 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
| 2064 | Elf_Shdr *s = &info->sechdrs[i]; |
| 2065 | const char *sname = info->secstrings + s->sh_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | |
| 2067 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
| 2068 | || (s->sh_flags & masks[m][1]) |
| 2069 | || s->sh_entsize != ~0UL |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2070 | || strstarts(sname, ".init")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2071 | continue; |
Helge Deller | 088af9a | 2008-12-31 12:31:18 +0100 | [diff] [blame] | 2072 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 2073 | pr_debug("\t%s\n", sname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2074 | } |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 2075 | switch (m) { |
| 2076 | case 0: /* executable */ |
| 2077 | mod->core_size = debug_align(mod->core_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2078 | mod->core_text_size = mod->core_size; |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 2079 | break; |
| 2080 | case 1: /* RO: text and ro-data */ |
| 2081 | mod->core_size = debug_align(mod->core_size); |
| 2082 | mod->core_ro_size = mod->core_size; |
| 2083 | break; |
| 2084 | case 3: /* whole core */ |
| 2085 | mod->core_size = debug_align(mod->core_size); |
| 2086 | break; |
| 2087 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | } |
| 2089 | |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 2090 | pr_debug("Init section allocation order:\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2091 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2092 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
| 2093 | Elf_Shdr *s = &info->sechdrs[i]; |
| 2094 | const char *sname = info->secstrings + s->sh_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | |
| 2096 | if ((s->sh_flags & masks[m][0]) != masks[m][0] |
| 2097 | || (s->sh_flags & masks[m][1]) |
| 2098 | || s->sh_entsize != ~0UL |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2099 | || !strstarts(sname, ".init")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | continue; |
Helge Deller | 088af9a | 2008-12-31 12:31:18 +0100 | [diff] [blame] | 2101 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | | INIT_OFFSET_MASK); |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 2103 | pr_debug("\t%s\n", sname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | } |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 2105 | switch (m) { |
| 2106 | case 0: /* executable */ |
| 2107 | mod->init_size = debug_align(mod->init_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | mod->init_text_size = mod->init_size; |
matthieu castet | 84e1c6b | 2010-11-16 22:35:16 +0100 | [diff] [blame] | 2109 | break; |
| 2110 | case 1: /* RO: text and ro-data */ |
| 2111 | mod->init_size = debug_align(mod->init_size); |
| 2112 | mod->init_ro_size = mod->init_size; |
| 2113 | break; |
| 2114 | case 3: /* whole init */ |
| 2115 | mod->init_size = debug_align(mod->init_size); |
| 2116 | break; |
| 2117 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | } |
| 2119 | } |
| 2120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | static void set_license(struct module *mod, const char *license) |
| 2122 | { |
| 2123 | if (!license) |
| 2124 | license = "unspecified"; |
| 2125 | |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 2126 | if (!license_is_gpl_compatible(license)) { |
Andi Kleen | 25ddbb1 | 2008-10-15 22:01:41 -0700 | [diff] [blame] | 2127 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 2128 | pr_warn("%s: module license '%s' taints kernel.\n", |
| 2129 | mod->name, license); |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 2130 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
| 2131 | LOCKDEP_NOW_UNRELIABLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | } |
| 2133 | } |
| 2134 | |
| 2135 | /* Parse tag=value strings from .modinfo section */ |
| 2136 | static char *next_string(char *string, unsigned long *secsize) |
| 2137 | { |
| 2138 | /* Skip non-zero chars */ |
| 2139 | while (string[0]) { |
| 2140 | string++; |
| 2141 | if ((*secsize)-- <= 1) |
| 2142 | return NULL; |
| 2143 | } |
| 2144 | |
| 2145 | /* Skip any zero padding. */ |
| 2146 | while (!string[0]) { |
| 2147 | string++; |
| 2148 | if ((*secsize)-- <= 1) |
| 2149 | return NULL; |
| 2150 | } |
| 2151 | return string; |
| 2152 | } |
| 2153 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2154 | static char *get_modinfo(struct load_info *info, const char *tag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | { |
| 2156 | char *p; |
| 2157 | unsigned int taglen = strlen(tag); |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2158 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
| 2159 | unsigned long size = infosec->sh_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2161 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
| 2163 | return p + taglen + 1; |
| 2164 | } |
| 2165 | return NULL; |
| 2166 | } |
| 2167 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2168 | static void setup_modinfo(struct module *mod, struct load_info *info) |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 2169 | { |
| 2170 | struct module_attribute *attr; |
| 2171 | int i; |
| 2172 | |
| 2173 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
| 2174 | if (attr->setup) |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2175 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 2176 | } |
| 2177 | } |
Matt Domsch | c988d2b | 2005-06-23 22:05:15 -0700 | [diff] [blame] | 2178 | |
Rusty Russell | a263f77 | 2009-09-25 00:32:58 -0600 | [diff] [blame] | 2179 | static void free_modinfo(struct module *mod) |
| 2180 | { |
| 2181 | struct module_attribute *attr; |
| 2182 | int i; |
| 2183 | |
| 2184 | for (i = 0; (attr = modinfo_attrs[i]); i++) { |
| 2185 | if (attr->free) |
| 2186 | attr->free(mod); |
| 2187 | } |
| 2188 | } |
| 2189 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2190 | #ifdef CONFIG_KALLSYMS |
WANG Cong | 15bba37 | 2008-07-24 15:41:48 +0100 | [diff] [blame] | 2191 | |
| 2192 | /* lookup symbol in given range of kernel_symbols */ |
| 2193 | static const struct kernel_symbol *lookup_symbol(const char *name, |
| 2194 | const struct kernel_symbol *start, |
| 2195 | const struct kernel_symbol *stop) |
| 2196 | { |
Alessio Igor Bogani | 9d63487 | 2011-05-18 22:35:59 +0200 | [diff] [blame] | 2197 | return bsearch(name, start, stop - start, |
| 2198 | sizeof(struct kernel_symbol), cmp_name); |
WANG Cong | 15bba37 | 2008-07-24 15:41:48 +0100 | [diff] [blame] | 2199 | } |
| 2200 | |
Tim Abbott | ca4787b | 2009-01-05 08:40:10 -0600 | [diff] [blame] | 2201 | static int is_exported(const char *name, unsigned long value, |
| 2202 | const struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2203 | { |
Tim Abbott | ca4787b | 2009-01-05 08:40:10 -0600 | [diff] [blame] | 2204 | const struct kernel_symbol *ks; |
| 2205 | if (!mod) |
| 2206 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); |
Sam Ravnborg | 3fd6805 | 2006-02-08 21:16:45 +0100 | [diff] [blame] | 2207 | else |
Tim Abbott | ca4787b | 2009-01-05 08:40:10 -0600 | [diff] [blame] | 2208 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
| 2209 | return ks != NULL && ks->value == value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | } |
| 2211 | |
| 2212 | /* As per nm */ |
Rusty Russell | eded41c | 2010-08-05 12:59:07 -0600 | [diff] [blame] | 2213 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2214 | { |
Rusty Russell | eded41c | 2010-08-05 12:59:07 -0600 | [diff] [blame] | 2215 | const Elf_Shdr *sechdrs = info->sechdrs; |
| 2216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2217 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
| 2218 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) |
| 2219 | return 'v'; |
| 2220 | else |
| 2221 | return 'w'; |
| 2222 | } |
| 2223 | if (sym->st_shndx == SHN_UNDEF) |
| 2224 | return 'U'; |
| 2225 | if (sym->st_shndx == SHN_ABS) |
| 2226 | return 'a'; |
| 2227 | if (sym->st_shndx >= SHN_LORESERVE) |
| 2228 | return '?'; |
| 2229 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) |
| 2230 | return 't'; |
| 2231 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC |
| 2232 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { |
| 2233 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) |
| 2234 | return 'r'; |
| 2235 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
| 2236 | return 'g'; |
| 2237 | else |
| 2238 | return 'd'; |
| 2239 | } |
| 2240 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { |
| 2241 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
| 2242 | return 's'; |
| 2243 | else |
| 2244 | return 'b'; |
| 2245 | } |
Rusty Russell | eded41c | 2010-08-05 12:59:07 -0600 | [diff] [blame] | 2246 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
| 2247 | ".debug")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | return 'n'; |
Rusty Russell | eded41c | 2010-08-05 12:59:07 -0600 | [diff] [blame] | 2249 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | return '?'; |
| 2251 | } |
| 2252 | |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2253 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
| 2254 | unsigned int shnum) |
| 2255 | { |
| 2256 | const Elf_Shdr *sec; |
| 2257 | |
| 2258 | if (src->st_shndx == SHN_UNDEF |
| 2259 | || src->st_shndx >= shnum |
| 2260 | || !src->st_name) |
| 2261 | return false; |
| 2262 | |
| 2263 | sec = sechdrs + src->st_shndx; |
| 2264 | if (!(sec->sh_flags & SHF_ALLOC) |
| 2265 | #ifndef CONFIG_KALLSYMS_ALL |
| 2266 | || !(sec->sh_flags & SHF_EXECINSTR) |
| 2267 | #endif |
| 2268 | || (sec->sh_entsize & INIT_OFFSET_MASK)) |
| 2269 | return false; |
| 2270 | |
| 2271 | return true; |
| 2272 | } |
| 2273 | |
Kevin Cernekee | 48fd118 | 2012-01-13 09:32:14 +1030 | [diff] [blame] | 2274 | /* |
| 2275 | * We only allocate and copy the strings needed by the parts of symtab |
| 2276 | * we keep. This is simple, but has the effect of making multiple |
| 2277 | * copies of duplicates. We could be more sophisticated, see |
| 2278 | * linux-kernel thread starting with |
| 2279 | * <73defb5e4bca04a6431392cc341112b1@localhost>. |
| 2280 | */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2281 | static void layout_symtab(struct module *mod, struct load_info *info) |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2282 | { |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2283 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
| 2284 | Elf_Shdr *strsect = info->sechdrs + info->index.str; |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2285 | const Elf_Sym *src; |
Satoru Takeuchi | 54523ec | 2012-12-05 12:29:04 +1030 | [diff] [blame] | 2286 | unsigned int i, nsrc, ndst, strtab_size = 0; |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2287 | |
| 2288 | /* Put symbol section at end of init part of module. */ |
| 2289 | symsect->sh_flags |= SHF_ALLOC; |
| 2290 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2291 | info->index.sym) | INIT_OFFSET_MASK; |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 2292 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2293 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2294 | src = (void *)info->hdr + symsect->sh_offset; |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2295 | nsrc = symsect->sh_size / sizeof(*src); |
Kevin Cernekee | 70b1e916 | 2011-11-12 19:08:55 -0800 | [diff] [blame] | 2296 | |
Kevin Cernekee | 48fd118 | 2012-01-13 09:32:14 +1030 | [diff] [blame] | 2297 | /* Compute total space required for the core symbols' strtab. */ |
Rusty Russell | 59ef28b | 2012-10-25 10:49:25 +1030 | [diff] [blame] | 2298 | for (ndst = i = 0; i < nsrc; i++) { |
| 2299 | if (i == 0 || |
| 2300 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { |
| 2301 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
Kevin Cernekee | 48fd118 | 2012-01-13 09:32:14 +1030 | [diff] [blame] | 2302 | ndst++; |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 2303 | } |
Rusty Russell | 59ef28b | 2012-10-25 10:49:25 +1030 | [diff] [blame] | 2304 | } |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2305 | |
| 2306 | /* Append room for core symbols at end of core part. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2307 | info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); |
Kevin Cernekee | 48fd118 | 2012-01-13 09:32:14 +1030 | [diff] [blame] | 2308 | info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym); |
| 2309 | mod->core_size += strtab_size; |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2310 | |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 2311 | /* Put string table section at end of init part of module. */ |
| 2312 | strsect->sh_flags |= SHF_ALLOC; |
| 2313 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2314 | info->index.str) | INIT_OFFSET_MASK; |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 2315 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2316 | } |
| 2317 | |
Rusty Russell | 811d66a | 2010-08-05 12:59:12 -0600 | [diff] [blame] | 2318 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | { |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2320 | unsigned int i, ndst; |
| 2321 | const Elf_Sym *src; |
| 2322 | Elf_Sym *dst; |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 2323 | char *s; |
Rusty Russell | eded41c | 2010-08-05 12:59:07 -0600 | [diff] [blame] | 2324 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2325 | |
Rusty Russell | eded41c | 2010-08-05 12:59:07 -0600 | [diff] [blame] | 2326 | mod->symtab = (void *)symsec->sh_addr; |
| 2327 | mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); |
Rusty Russell | 511ca6a | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2328 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
| 2329 | mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2330 | |
| 2331 | /* Set types up while we still have access to sections. */ |
| 2332 | for (i = 0; i < mod->num_symtab; i++) |
Rusty Russell | eded41c | 2010-08-05 12:59:07 -0600 | [diff] [blame] | 2333 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2334 | |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2335 | mod->core_symtab = dst = mod->module_core + info->symoffs; |
Kevin Cernekee | 48fd118 | 2012-01-13 09:32:14 +1030 | [diff] [blame] | 2336 | mod->core_strtab = s = mod->module_core + info->stroffs; |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2337 | src = mod->symtab; |
Rusty Russell | 59ef28b | 2012-10-25 10:49:25 +1030 | [diff] [blame] | 2338 | for (ndst = i = 0; i < mod->num_symtab; i++) { |
| 2339 | if (i == 0 || |
| 2340 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { |
| 2341 | dst[ndst] = src[i]; |
| 2342 | dst[ndst++].st_name = s - mod->core_strtab; |
| 2343 | s += strlcpy(s, &mod->strtab[src[i].st_name], |
| 2344 | KSYM_NAME_LEN) + 1; |
| 2345 | } |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2346 | } |
| 2347 | mod->core_num_syms = ndst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2348 | } |
| 2349 | #else |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2350 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 2351 | { |
| 2352 | } |
Paul Mundt | 3ae91c2 | 2009-10-01 15:43:54 -0700 | [diff] [blame] | 2353 | |
Michał Mirosław | abbce90 | 2010-09-20 01:58:08 +0200 | [diff] [blame] | 2354 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2355 | { |
| 2356 | } |
| 2357 | #endif /* CONFIG_KALLSYMS */ |
| 2358 | |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 2359 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2360 | { |
Rusty Russell | 811d66a | 2010-08-05 12:59:12 -0600 | [diff] [blame] | 2361 | if (!debug) |
| 2362 | return; |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 2363 | #ifdef CONFIG_DYNAMIC_DEBUG |
| 2364 | if (ddebug_add_module(debug, num, debug->modname)) |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 2365 | pr_err("dynamic debug error adding module: %s\n", |
| 2366 | debug->modname); |
Jason Baron | e9d376f | 2009-02-05 11:51:38 -0500 | [diff] [blame] | 2367 | #endif |
Rusty Russell | 5e458cc | 2008-10-22 10:00:13 -0500 | [diff] [blame] | 2368 | } |
Jason Baron | 346e15b | 2008-08-12 16:46:19 -0400 | [diff] [blame] | 2369 | |
Yehuda Sadeh | ff49d74 | 2010-07-03 13:07:35 +1000 | [diff] [blame] | 2370 | static void dynamic_debug_remove(struct _ddebug *debug) |
| 2371 | { |
| 2372 | if (debug) |
| 2373 | ddebug_remove_module(debug->modname); |
| 2374 | } |
| 2375 | |
Jonas Bonn | 74e08fc | 2011-06-30 21:22:11 +0200 | [diff] [blame] | 2376 | void * __weak module_alloc(unsigned long size) |
| 2377 | { |
Rusty Russell | 82fab44 | 2012-12-11 09:38:33 +1030 | [diff] [blame] | 2378 | return vmalloc_exec(size); |
Jonas Bonn | 74e08fc | 2011-06-30 21:22:11 +0200 | [diff] [blame] | 2379 | } |
| 2380 | |
Rusty Russell | 3a642e9 | 2008-07-22 19:24:28 -0500 | [diff] [blame] | 2381 | static void *module_alloc_update_bounds(unsigned long size) |
| 2382 | { |
| 2383 | void *ret = module_alloc(size); |
| 2384 | |
| 2385 | if (ret) { |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 2386 | mutex_lock(&module_mutex); |
Rusty Russell | 3a642e9 | 2008-07-22 19:24:28 -0500 | [diff] [blame] | 2387 | /* Update module bounds. */ |
| 2388 | if ((unsigned long)ret < module_addr_min) |
| 2389 | module_addr_min = (unsigned long)ret; |
| 2390 | if ((unsigned long)ret + size > module_addr_max) |
| 2391 | module_addr_max = (unsigned long)ret + size; |
Rusty Russell | 7567650 | 2010-06-05 11:17:36 -0600 | [diff] [blame] | 2392 | mutex_unlock(&module_mutex); |
Rusty Russell | 3a642e9 | 2008-07-22 19:24:28 -0500 | [diff] [blame] | 2393 | } |
| 2394 | return ret; |
| 2395 | } |
| 2396 | |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 2397 | #ifdef CONFIG_DEBUG_KMEMLEAK |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2398 | static void kmemleak_load_module(const struct module *mod, |
| 2399 | const struct load_info *info) |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 2400 | { |
| 2401 | unsigned int i; |
| 2402 | |
| 2403 | /* only scan the sections containing data */ |
Catalin Marinas | c017b4b | 2009-10-28 13:33:09 +0000 | [diff] [blame] | 2404 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 2405 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2406 | for (i = 1; i < info->hdr->e_shnum; i++) { |
Steven Rostedt | 06c9494 | 2013-05-15 20:33:01 +0100 | [diff] [blame] | 2407 | /* Scan all writable sections that's not executable */ |
| 2408 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || |
| 2409 | !(info->sechdrs[i].sh_flags & SHF_WRITE) || |
| 2410 | (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 2411 | continue; |
| 2412 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2413 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
| 2414 | info->sechdrs[i].sh_size, GFP_KERNEL); |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 2415 | } |
| 2416 | } |
| 2417 | #else |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2418 | static inline void kmemleak_load_module(const struct module *mod, |
| 2419 | const struct load_info *info) |
Catalin Marinas | 4f2294b | 2009-06-11 13:23:20 +0100 | [diff] [blame] | 2420 | { |
| 2421 | } |
| 2422 | #endif |
| 2423 | |
Rusty Russell | 106a4ee | 2012-09-26 10:09:40 +0100 | [diff] [blame] | 2424 | #ifdef CONFIG_MODULE_SIG |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2425 | static int module_sig_check(struct load_info *info) |
Rusty Russell | 106a4ee | 2012-09-26 10:09:40 +0100 | [diff] [blame] | 2426 | { |
| 2427 | int err = -ENOKEY; |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2428 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
| 2429 | const void *mod = info->hdr; |
Rusty Russell | 106a4ee | 2012-09-26 10:09:40 +0100 | [diff] [blame] | 2430 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2431 | if (info->len > markerlen && |
| 2432 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
David Howells | caabe24 | 2012-10-20 01:19:29 +0100 | [diff] [blame] | 2433 | /* We truncate the module to discard the signature */ |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2434 | info->len -= markerlen; |
| 2435 | err = mod_verify_sig(mod, &info->len); |
Rusty Russell | 106a4ee | 2012-09-26 10:09:40 +0100 | [diff] [blame] | 2436 | } |
| 2437 | |
| 2438 | if (!err) { |
| 2439 | info->sig_ok = true; |
| 2440 | return 0; |
| 2441 | } |
| 2442 | |
| 2443 | /* Not having a signature is only an error if we're strict. */ |
| 2444 | if (err == -ENOKEY && !sig_enforce) |
| 2445 | err = 0; |
| 2446 | |
| 2447 | return err; |
| 2448 | } |
| 2449 | #else /* !CONFIG_MODULE_SIG */ |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2450 | static int module_sig_check(struct load_info *info) |
Rusty Russell | 106a4ee | 2012-09-26 10:09:40 +0100 | [diff] [blame] | 2451 | { |
| 2452 | return 0; |
| 2453 | } |
| 2454 | #endif /* !CONFIG_MODULE_SIG */ |
| 2455 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2456 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
| 2457 | static int elf_header_check(struct load_info *info) |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2458 | { |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2459 | if (info->len < sizeof(*(info->hdr))) |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2460 | return -ENOEXEC; |
| 2461 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2462 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 |
| 2463 | || info->hdr->e_type != ET_REL |
| 2464 | || !elf_check_arch(info->hdr) |
| 2465 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) |
| 2466 | return -ENOEXEC; |
| 2467 | |
| 2468 | if (info->hdr->e_shoff >= info->len |
| 2469 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > |
| 2470 | info->len - info->hdr->e_shoff)) |
| 2471 | return -ENOEXEC; |
| 2472 | |
| 2473 | return 0; |
| 2474 | } |
| 2475 | |
| 2476 | /* Sets info->hdr and info->len. */ |
| 2477 | static int copy_module_from_user(const void __user *umod, unsigned long len, |
| 2478 | struct load_info *info) |
| 2479 | { |
Kees Cook | 2e72d51 | 2012-10-16 07:32:07 +1030 | [diff] [blame] | 2480 | int err; |
| 2481 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2482 | info->len = len; |
| 2483 | if (info->len < sizeof(*(info->hdr))) |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2484 | return -ENOEXEC; |
| 2485 | |
Kees Cook | 2e72d51 | 2012-10-16 07:32:07 +1030 | [diff] [blame] | 2486 | err = security_kernel_module_from_file(NULL); |
| 2487 | if (err) |
| 2488 | return err; |
| 2489 | |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2490 | /* Suck in entire file: we'll want most of it. */ |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2491 | info->hdr = vmalloc(info->len); |
| 2492 | if (!info->hdr) |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2493 | return -ENOMEM; |
| 2494 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2495 | if (copy_from_user(info->hdr, umod, info->len) != 0) { |
| 2496 | vfree(info->hdr); |
| 2497 | return -EFAULT; |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2498 | } |
| 2499 | |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2500 | return 0; |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2501 | } |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2502 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2503 | /* Sets info->hdr and info->len. */ |
| 2504 | static int copy_module_from_fd(int fd, struct load_info *info) |
| 2505 | { |
Al Viro | a2e0578 | 2013-08-30 12:41:41 -0400 | [diff] [blame] | 2506 | struct fd f = fdget(fd); |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2507 | int err; |
| 2508 | struct kstat stat; |
| 2509 | loff_t pos; |
| 2510 | ssize_t bytes = 0; |
| 2511 | |
Al Viro | a2e0578 | 2013-08-30 12:41:41 -0400 | [diff] [blame] | 2512 | if (!f.file) |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2513 | return -ENOEXEC; |
| 2514 | |
Al Viro | a2e0578 | 2013-08-30 12:41:41 -0400 | [diff] [blame] | 2515 | err = security_kernel_module_from_file(f.file); |
Kees Cook | 2e72d51 | 2012-10-16 07:32:07 +1030 | [diff] [blame] | 2516 | if (err) |
| 2517 | goto out; |
| 2518 | |
Al Viro | a2e0578 | 2013-08-30 12:41:41 -0400 | [diff] [blame] | 2519 | err = vfs_getattr(&f.file->f_path, &stat); |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2520 | if (err) |
| 2521 | goto out; |
| 2522 | |
| 2523 | if (stat.size > INT_MAX) { |
| 2524 | err = -EFBIG; |
| 2525 | goto out; |
| 2526 | } |
Sasha Levin | 52441fa | 2013-01-03 11:09:53 +1030 | [diff] [blame] | 2527 | |
| 2528 | /* Don't hand 0 to vmalloc, it whines. */ |
| 2529 | if (stat.size == 0) { |
| 2530 | err = -EINVAL; |
| 2531 | goto out; |
| 2532 | } |
| 2533 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2534 | info->hdr = vmalloc(stat.size); |
| 2535 | if (!info->hdr) { |
| 2536 | err = -ENOMEM; |
| 2537 | goto out; |
| 2538 | } |
| 2539 | |
| 2540 | pos = 0; |
| 2541 | while (pos < stat.size) { |
Al Viro | a2e0578 | 2013-08-30 12:41:41 -0400 | [diff] [blame] | 2542 | bytes = kernel_read(f.file, pos, (char *)(info->hdr) + pos, |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 2543 | stat.size - pos); |
| 2544 | if (bytes < 0) { |
| 2545 | vfree(info->hdr); |
| 2546 | err = bytes; |
| 2547 | goto out; |
| 2548 | } |
| 2549 | if (bytes == 0) |
| 2550 | break; |
| 2551 | pos += bytes; |
| 2552 | } |
| 2553 | info->len = pos; |
| 2554 | |
| 2555 | out: |
Al Viro | a2e0578 | 2013-08-30 12:41:41 -0400 | [diff] [blame] | 2556 | fdput(f); |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2557 | return err; |
| 2558 | } |
| 2559 | |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2560 | static void free_copy(struct load_info *info) |
| 2561 | { |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2562 | vfree(info->hdr); |
| 2563 | } |
| 2564 | |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 2565 | static int rewrite_section_headers(struct load_info *info, int flags) |
Rusty Russell | 8b5f61a | 2010-08-05 12:59:06 -0600 | [diff] [blame] | 2566 | { |
| 2567 | unsigned int i; |
| 2568 | |
| 2569 | /* This should always be true, but let's be sure. */ |
| 2570 | info->sechdrs[0].sh_addr = 0; |
| 2571 | |
| 2572 | for (i = 1; i < info->hdr->e_shnum; i++) { |
| 2573 | Elf_Shdr *shdr = &info->sechdrs[i]; |
| 2574 | if (shdr->sh_type != SHT_NOBITS |
| 2575 | && info->len < shdr->sh_offset + shdr->sh_size) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 2576 | pr_err("Module len %lu truncated\n", info->len); |
Rusty Russell | 8b5f61a | 2010-08-05 12:59:06 -0600 | [diff] [blame] | 2577 | return -ENOEXEC; |
| 2578 | } |
| 2579 | |
| 2580 | /* Mark all sections sh_addr with their address in the |
| 2581 | temporary image. */ |
| 2582 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; |
| 2583 | |
| 2584 | #ifndef CONFIG_MODULE_UNLOAD |
| 2585 | /* Don't load .exit sections */ |
| 2586 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) |
| 2587 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; |
| 2588 | #endif |
Rusty Russell | 8b5f61a | 2010-08-05 12:59:06 -0600 | [diff] [blame] | 2589 | } |
Rusty Russell | d6df72a | 2010-08-05 12:59:07 -0600 | [diff] [blame] | 2590 | |
| 2591 | /* Track but don't keep modinfo and version sections. */ |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 2592 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
| 2593 | info->index.vers = 0; /* Pretend no __versions section! */ |
| 2594 | else |
| 2595 | info->index.vers = find_sec(info, "__versions"); |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2596 | info->index.info = find_sec(info, ".modinfo"); |
Rusty Russell | d6df72a | 2010-08-05 12:59:07 -0600 | [diff] [blame] | 2597 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
| 2598 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
Rusty Russell | 8b5f61a | 2010-08-05 12:59:06 -0600 | [diff] [blame] | 2599 | return 0; |
| 2600 | } |
| 2601 | |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2602 | /* |
| 2603 | * Set up our basic convenience variables (pointers to section headers, |
| 2604 | * search for module section index etc), and do some basic section |
| 2605 | * verification. |
| 2606 | * |
| 2607 | * Return the temporary module pointer (we'll replace it with the final |
| 2608 | * one when we move the module sections around). |
| 2609 | */ |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 2610 | static struct module *setup_load_info(struct load_info *info, int flags) |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2611 | { |
| 2612 | unsigned int i; |
Rusty Russell | 8b5f61a | 2010-08-05 12:59:06 -0600 | [diff] [blame] | 2613 | int err; |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2614 | struct module *mod; |
| 2615 | |
| 2616 | /* Set up the convenience variables */ |
| 2617 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; |
Rusty Russell | 8b5f61a | 2010-08-05 12:59:06 -0600 | [diff] [blame] | 2618 | info->secstrings = (void *)info->hdr |
| 2619 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2620 | |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 2621 | err = rewrite_section_headers(info, flags); |
Rusty Russell | 8b5f61a | 2010-08-05 12:59:06 -0600 | [diff] [blame] | 2622 | if (err) |
| 2623 | return ERR_PTR(err); |
| 2624 | |
| 2625 | /* Find internal symbols and strings. */ |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2626 | for (i = 1; i < info->hdr->e_shnum; i++) { |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2627 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
| 2628 | info->index.sym = i; |
| 2629 | info->index.str = info->sechdrs[i].sh_link; |
Rusty Russell | 8b5f61a | 2010-08-05 12:59:06 -0600 | [diff] [blame] | 2630 | info->strtab = (char *)info->hdr |
| 2631 | + info->sechdrs[info->index.str].sh_offset; |
| 2632 | break; |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2633 | } |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2634 | } |
| 2635 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2636 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2637 | if (!info->index.mod) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 2638 | pr_warn("No module found in object\n"); |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2639 | return ERR_PTR(-ENOEXEC); |
| 2640 | } |
| 2641 | /* This is temporary: point mod into copy of data. */ |
| 2642 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; |
| 2643 | |
| 2644 | if (info->index.sym == 0) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 2645 | pr_warn("%s: module has no symbols (stripped?)\n", mod->name); |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2646 | return ERR_PTR(-ENOEXEC); |
| 2647 | } |
| 2648 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2649 | info->index.pcpu = find_pcpusec(info); |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2650 | |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2651 | /* Check module struct version now, before we try to use module. */ |
| 2652 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) |
| 2653 | return ERR_PTR(-ENOEXEC); |
| 2654 | |
| 2655 | return mod; |
Linus Torvalds | 3264d3f | 2010-06-02 11:01:06 -0700 | [diff] [blame] | 2656 | } |
| 2657 | |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 2658 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2659 | { |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2660 | const char *modmagic = get_modinfo(info, "vermagic"); |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2661 | int err; |
| 2662 | |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 2663 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
| 2664 | modmagic = NULL; |
| 2665 | |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2666 | /* This is allowed: modprobe --force will invalidate it. */ |
| 2667 | if (!modmagic) { |
| 2668 | err = try_to_force_load(mod, "bad vermagic"); |
| 2669 | if (err) |
| 2670 | return err; |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2671 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 2672 | pr_err("%s: version magic '%s' should be '%s'\n", |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2673 | mod->name, modmagic, vermagic); |
| 2674 | return -ENOEXEC; |
| 2675 | } |
| 2676 | |
Ben Hutchings | 2449b8b | 2011-10-24 15:12:28 +0200 | [diff] [blame] | 2677 | if (!get_modinfo(info, "intree")) |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 2678 | add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
Ben Hutchings | 2449b8b | 2011-10-24 15:12:28 +0200 | [diff] [blame] | 2679 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2680 | if (get_modinfo(info, "staging")) { |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 2681 | add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 2682 | pr_warn("%s: module is from the staging directory, the quality " |
| 2683 | "is unknown, you have been warned.\n", mod->name); |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2684 | } |
Rusty Russell | 22e268e | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 2685 | |
| 2686 | /* Set up license info based on the info section */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2687 | set_license(mod, get_modinfo(info, "license")); |
Rusty Russell | 22e268e | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 2688 | |
Rusty Russell | 40dd256 | 2010-08-05 12:59:03 -0600 | [diff] [blame] | 2689 | return 0; |
| 2690 | } |
| 2691 | |
Frantisek Hrbata | eb3057d | 2013-10-14 18:08:46 +1030 | [diff] [blame] | 2692 | static int find_module_sections(struct module *mod, struct load_info *info) |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2693 | { |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2694 | mod->kp = section_objs(info, "__param", |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2695 | sizeof(*mod->kp), &mod->num_kp); |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2696 | mod->syms = section_objs(info, "__ksymtab", |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2697 | sizeof(*mod->syms), &mod->num_syms); |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2698 | mod->crcs = section_addr(info, "__kcrctab"); |
| 2699 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2700 | sizeof(*mod->gpl_syms), |
| 2701 | &mod->num_gpl_syms); |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2702 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
| 2703 | mod->gpl_future_syms = section_objs(info, |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2704 | "__ksymtab_gpl_future", |
| 2705 | sizeof(*mod->gpl_future_syms), |
| 2706 | &mod->num_gpl_future_syms); |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2707 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2708 | |
| 2709 | #ifdef CONFIG_UNUSED_SYMBOLS |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2710 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2711 | sizeof(*mod->unused_syms), |
| 2712 | &mod->num_unused_syms); |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2713 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
| 2714 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2715 | sizeof(*mod->unused_gpl_syms), |
| 2716 | &mod->num_unused_gpl_syms); |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2717 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2718 | #endif |
| 2719 | #ifdef CONFIG_CONSTRUCTORS |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2720 | mod->ctors = section_objs(info, ".ctors", |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2721 | sizeof(*mod->ctors), &mod->num_ctors); |
Frantisek Hrbata | eb3057d | 2013-10-14 18:08:46 +1030 | [diff] [blame] | 2722 | if (!mod->ctors) |
| 2723 | mod->ctors = section_objs(info, ".init_array", |
| 2724 | sizeof(*mod->ctors), &mod->num_ctors); |
| 2725 | else if (find_sec(info, ".init_array")) { |
| 2726 | /* |
| 2727 | * This shouldn't happen with same compiler and binutils |
| 2728 | * building all parts of the module. |
| 2729 | */ |
| 2730 | printk(KERN_WARNING "%s: has both .ctors and .init_array.\n", |
| 2731 | mod->name); |
| 2732 | return -EINVAL; |
| 2733 | } |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2734 | #endif |
| 2735 | |
| 2736 | #ifdef CONFIG_TRACEPOINTS |
Mathieu Desnoyers | 6549864 | 2011-01-26 17:26:22 -0500 | [diff] [blame] | 2737 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
| 2738 | sizeof(*mod->tracepoints_ptrs), |
| 2739 | &mod->num_tracepoints); |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2740 | #endif |
Jason Baron | bf5438fc | 2010-09-17 11:09:00 -0400 | [diff] [blame] | 2741 | #ifdef HAVE_JUMP_LABEL |
| 2742 | mod->jump_entries = section_objs(info, "__jump_table", |
| 2743 | sizeof(*mod->jump_entries), |
| 2744 | &mod->num_jump_entries); |
| 2745 | #endif |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2746 | #ifdef CONFIG_EVENT_TRACING |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2747 | mod->trace_events = section_objs(info, "_ftrace_events", |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2748 | sizeof(*mod->trace_events), |
| 2749 | &mod->num_trace_events); |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2750 | #endif |
Steven Rostedt | 13b9b6e | 2010-11-10 22:19:24 -0500 | [diff] [blame] | 2751 | #ifdef CONFIG_TRACING |
| 2752 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", |
| 2753 | sizeof(*mod->trace_bprintk_fmt_start), |
| 2754 | &mod->num_trace_bprintk_fmt); |
Steven Rostedt | 13b9b6e | 2010-11-10 22:19:24 -0500 | [diff] [blame] | 2755 | #endif |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2756 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
| 2757 | /* sechdrs[0].sh_size is always zero */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2758 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2759 | sizeof(*mod->ftrace_callsites), |
| 2760 | &mod->num_ftrace_callsites); |
| 2761 | #endif |
Rusty Russell | 22e268e | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 2762 | |
Rusty Russell | 811d66a | 2010-08-05 12:59:12 -0600 | [diff] [blame] | 2763 | mod->extable = section_objs(info, "__ex_table", |
| 2764 | sizeof(*mod->extable), &mod->num_exentries); |
| 2765 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2766 | if (section_addr(info, "__obsparm")) |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 2767 | pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
Rusty Russell | 811d66a | 2010-08-05 12:59:12 -0600 | [diff] [blame] | 2768 | |
| 2769 | info->debug = section_objs(info, "__verbose", |
| 2770 | sizeof(*info->debug), &info->num_debug); |
Frantisek Hrbata | eb3057d | 2013-10-14 18:08:46 +1030 | [diff] [blame] | 2771 | |
| 2772 | return 0; |
Linus Torvalds | f91a13b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2773 | } |
| 2774 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2775 | static int move_module(struct module *mod, struct load_info *info) |
Linus Torvalds | 65b8a9b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2776 | { |
| 2777 | int i; |
| 2778 | void *ptr; |
| 2779 | |
| 2780 | /* Do the allocs. */ |
| 2781 | ptr = module_alloc_update_bounds(mod->core_size); |
| 2782 | /* |
| 2783 | * The pointer to this block is stored in the module structure |
| 2784 | * which is inside the block. Just mark it as not being a |
| 2785 | * leak. |
| 2786 | */ |
| 2787 | kmemleak_not_leak(ptr); |
| 2788 | if (!ptr) |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2789 | return -ENOMEM; |
Linus Torvalds | 65b8a9b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2790 | |
| 2791 | memset(ptr, 0, mod->core_size); |
| 2792 | mod->module_core = ptr; |
| 2793 | |
Rusty Russell | 82fab44 | 2012-12-11 09:38:33 +1030 | [diff] [blame] | 2794 | if (mod->init_size) { |
| 2795 | ptr = module_alloc_update_bounds(mod->init_size); |
| 2796 | /* |
| 2797 | * The pointer to this block is stored in the module structure |
| 2798 | * which is inside the block. This block doesn't need to be |
| 2799 | * scanned as it contains data and code that will be freed |
| 2800 | * after the module is initialized. |
| 2801 | */ |
| 2802 | kmemleak_ignore(ptr); |
| 2803 | if (!ptr) { |
| 2804 | module_free(mod, mod->module_core); |
| 2805 | return -ENOMEM; |
| 2806 | } |
| 2807 | memset(ptr, 0, mod->init_size); |
| 2808 | mod->module_init = ptr; |
| 2809 | } else |
| 2810 | mod->module_init = NULL; |
Linus Torvalds | 65b8a9b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2811 | |
| 2812 | /* Transfer each section which specifies SHF_ALLOC */ |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 2813 | pr_debug("final section addresses:\n"); |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2814 | for (i = 0; i < info->hdr->e_shnum; i++) { |
Linus Torvalds | 65b8a9b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2815 | void *dest; |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2816 | Elf_Shdr *shdr = &info->sechdrs[i]; |
Linus Torvalds | 65b8a9b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2817 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2818 | if (!(shdr->sh_flags & SHF_ALLOC)) |
Linus Torvalds | 65b8a9b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2819 | continue; |
| 2820 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2821 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
Linus Torvalds | 65b8a9b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2822 | dest = mod->module_init |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2823 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
Linus Torvalds | 65b8a9b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2824 | else |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2825 | dest = mod->module_core + shdr->sh_entsize; |
Linus Torvalds | 65b8a9b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2826 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2827 | if (shdr->sh_type != SHT_NOBITS) |
| 2828 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); |
Linus Torvalds | 65b8a9b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2829 | /* Update sh_addr to point to copy in image. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2830 | shdr->sh_addr = (unsigned long)dest; |
Jim Cromie | 5e12416 | 2011-12-06 12:11:31 -0700 | [diff] [blame] | 2831 | pr_debug("\t0x%lx %s\n", |
| 2832 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); |
Linus Torvalds | 65b8a9b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2833 | } |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2834 | |
| 2835 | return 0; |
Linus Torvalds | 65b8a9b | 2010-08-05 12:59:02 -0600 | [diff] [blame] | 2836 | } |
| 2837 | |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2838 | static int check_module_license_and_versions(struct module *mod) |
Rusty Russell | 22e268e | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 2839 | { |
| 2840 | /* |
| 2841 | * ndiswrapper is under GPL by itself, but loads proprietary modules. |
| 2842 | * Don't use add_taint_module(), as it would prevent ndiswrapper from |
| 2843 | * using GPL-only symbols it needs. |
| 2844 | */ |
| 2845 | if (strcmp(mod->name, "ndiswrapper") == 0) |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 2846 | add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
Rusty Russell | 22e268e | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 2847 | |
| 2848 | /* driverloader was caught wrongly pretending to be under GPL */ |
| 2849 | if (strcmp(mod->name, "driverloader") == 0) |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 2850 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
| 2851 | LOCKDEP_NOW_UNRELIABLE); |
Rusty Russell | 22e268e | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 2852 | |
Matthew Garrett | c99af37 | 2012-06-22 13:49:31 -0400 | [diff] [blame] | 2853 | /* lve claims to be GPL but upstream won't provide source */ |
| 2854 | if (strcmp(mod->name, "lve") == 0) |
Rusty Russell | 373d4d0 | 2013-01-21 17:17:39 +1030 | [diff] [blame] | 2855 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
| 2856 | LOCKDEP_NOW_UNRELIABLE); |
Matthew Garrett | c99af37 | 2012-06-22 13:49:31 -0400 | [diff] [blame] | 2857 | |
Rusty Russell | 22e268e | 2010-08-05 12:59:05 -0600 | [diff] [blame] | 2858 | #ifdef CONFIG_MODVERSIONS |
| 2859 | if ((mod->num_syms && !mod->crcs) |
| 2860 | || (mod->num_gpl_syms && !mod->gpl_crcs) |
| 2861 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) |
| 2862 | #ifdef CONFIG_UNUSED_SYMBOLS |
| 2863 | || (mod->num_unused_syms && !mod->unused_crcs) |
| 2864 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) |
| 2865 | #endif |
| 2866 | ) { |
| 2867 | return try_to_force_load(mod, |
| 2868 | "no versions for exported symbols"); |
| 2869 | } |
| 2870 | #endif |
| 2871 | return 0; |
| 2872 | } |
| 2873 | |
| 2874 | static void flush_module_icache(const struct module *mod) |
| 2875 | { |
| 2876 | mm_segment_t old_fs; |
| 2877 | |
| 2878 | /* flush the icache in correct context */ |
| 2879 | old_fs = get_fs(); |
| 2880 | set_fs(KERNEL_DS); |
| 2881 | |
| 2882 | /* |
| 2883 | * Flush the instruction cache, since we've played with text. |
| 2884 | * Do it before processing of module parameters, so the module |
| 2885 | * can provide parameter accessor functions of its own. |
| 2886 | */ |
| 2887 | if (mod->module_init) |
| 2888 | flush_icache_range((unsigned long)mod->module_init, |
| 2889 | (unsigned long)mod->module_init |
| 2890 | + mod->init_size); |
| 2891 | flush_icache_range((unsigned long)mod->module_core, |
| 2892 | (unsigned long)mod->module_core + mod->core_size); |
| 2893 | |
| 2894 | set_fs(old_fs); |
| 2895 | } |
| 2896 | |
Jonas Bonn | 74e08fc | 2011-06-30 21:22:11 +0200 | [diff] [blame] | 2897 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
| 2898 | Elf_Shdr *sechdrs, |
| 2899 | char *secstrings, |
| 2900 | struct module *mod) |
| 2901 | { |
| 2902 | return 0; |
| 2903 | } |
| 2904 | |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 2905 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2906 | { |
| 2907 | /* Module within temporary copy. */ |
| 2908 | struct module *mod; |
| 2909 | int err; |
| 2910 | |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 2911 | mod = setup_load_info(info, flags); |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2912 | if (IS_ERR(mod)) |
| 2913 | return mod; |
| 2914 | |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 2915 | err = check_modinfo(mod, info, flags); |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2916 | if (err) |
| 2917 | return ERR_PTR(err); |
| 2918 | |
| 2919 | /* Allow arches to frob section contents and sizes. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2920 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
| 2921 | info->secstrings, mod); |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2922 | if (err < 0) |
Rusty Russell | 8d8022e | 2013-07-03 10:06:28 +0930 | [diff] [blame] | 2923 | return ERR_PTR(err); |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2924 | |
Rusty Russell | 8d8022e | 2013-07-03 10:06:28 +0930 | [diff] [blame] | 2925 | /* We will do a special allocation for per-cpu sections later. */ |
| 2926 | info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2927 | |
| 2928 | /* Determine total sizes, and put offsets in sh_entsize. For now |
| 2929 | this is done generically; there doesn't appear to be any |
| 2930 | special cases for the architectures. */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2931 | layout_sections(mod, info); |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2932 | layout_symtab(mod, info); |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2933 | |
| 2934 | /* Allocate and move to the final place */ |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2935 | err = move_module(mod, info); |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2936 | if (err) |
Rusty Russell | 8d8022e | 2013-07-03 10:06:28 +0930 | [diff] [blame] | 2937 | return ERR_PTR(err); |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2938 | |
| 2939 | /* Module has been copied to its final place now: return it. */ |
| 2940 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; |
Rusty Russell | 4966868 | 2010-08-05 12:59:10 -0600 | [diff] [blame] | 2941 | kmemleak_load_module(mod, info); |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2942 | return mod; |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2943 | } |
| 2944 | |
| 2945 | /* mod is no longer valid after this! */ |
| 2946 | static void module_deallocate(struct module *mod, struct load_info *info) |
| 2947 | { |
Rusty Russell | d913188 | 2010-08-05 12:59:08 -0600 | [diff] [blame] | 2948 | percpu_modfree(mod); |
| 2949 | module_free(mod, mod->module_init); |
| 2950 | module_free(mod, mod->module_core); |
| 2951 | } |
| 2952 | |
Jonas Bonn | 74e08fc | 2011-06-30 21:22:11 +0200 | [diff] [blame] | 2953 | int __weak module_finalize(const Elf_Ehdr *hdr, |
| 2954 | const Elf_Shdr *sechdrs, |
| 2955 | struct module *me) |
| 2956 | { |
| 2957 | return 0; |
| 2958 | } |
| 2959 | |
Rusty Russell | 811d66a | 2010-08-05 12:59:12 -0600 | [diff] [blame] | 2960 | static int post_relocation(struct module *mod, const struct load_info *info) |
| 2961 | { |
Rusty Russell | 51f3d0f | 2010-08-05 12:59:13 -0600 | [diff] [blame] | 2962 | /* Sort exception table now relocations are done. */ |
Rusty Russell | 811d66a | 2010-08-05 12:59:12 -0600 | [diff] [blame] | 2963 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
| 2964 | |
| 2965 | /* Copy relocated percpu area over. */ |
| 2966 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, |
| 2967 | info->sechdrs[info->index.pcpu].sh_size); |
| 2968 | |
Rusty Russell | 51f3d0f | 2010-08-05 12:59:13 -0600 | [diff] [blame] | 2969 | /* Setup kallsyms-specific fields. */ |
Rusty Russell | 811d66a | 2010-08-05 12:59:12 -0600 | [diff] [blame] | 2970 | add_kallsyms(mod, info); |
| 2971 | |
| 2972 | /* Arch-specific module finalizing. */ |
| 2973 | return module_finalize(info->hdr, info->sechdrs, mod); |
| 2974 | } |
| 2975 | |
Rusty Russell | 9bb9c3b | 2012-09-28 14:31:03 +0930 | [diff] [blame] | 2976 | /* Is this module of this name done loading? No locks held. */ |
| 2977 | static bool finished_loading(const char *name) |
| 2978 | { |
| 2979 | struct module *mod; |
| 2980 | bool ret; |
| 2981 | |
| 2982 | mutex_lock(&module_mutex); |
Mathias Krause | 4f6de4d | 2013-07-02 15:35:11 +0930 | [diff] [blame] | 2983 | mod = find_module_all(name, strlen(name), true); |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 2984 | ret = !mod || mod->state == MODULE_STATE_LIVE |
| 2985 | || mod->state == MODULE_STATE_GOING; |
Rusty Russell | 9bb9c3b | 2012-09-28 14:31:03 +0930 | [diff] [blame] | 2986 | mutex_unlock(&module_mutex); |
| 2987 | |
| 2988 | return ret; |
| 2989 | } |
| 2990 | |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 2991 | /* Call module constructors. */ |
| 2992 | static void do_mod_ctors(struct module *mod) |
| 2993 | { |
| 2994 | #ifdef CONFIG_CONSTRUCTORS |
| 2995 | unsigned long i; |
| 2996 | |
| 2997 | for (i = 0; i < mod->num_ctors; i++) |
| 2998 | mod->ctors[i](); |
| 2999 | #endif |
| 3000 | } |
| 3001 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3002 | /* This is where the real work happens */ |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3003 | static int do_init_module(struct module *mod) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3004 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3005 | int ret = 0; |
| 3006 | |
Tejun Heo | 774a122 | 2013-01-15 18:52:51 -0800 | [diff] [blame] | 3007 | /* |
| 3008 | * We want to find out whether @mod uses async during init. Clear |
| 3009 | * PF_USED_ASYNC. async_schedule*() will set it. |
| 3010 | */ |
| 3011 | current->flags &= ~PF_USED_ASYNC; |
| 3012 | |
Peter Oberparleiter | b99b87f | 2009-06-17 16:28:03 -0700 | [diff] [blame] | 3013 | do_mod_ctors(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3014 | /* Start the module */ |
| 3015 | if (mod->init != NULL) |
Arjan van de Ven | 59f9415 | 2008-07-30 12:49:02 -0700 | [diff] [blame] | 3016 | ret = do_one_initcall(mod->init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3017 | if (ret < 0) { |
| 3018 | /* Init routine failed: abort. Try to protect us from |
| 3019 | buggy refcounters. */ |
| 3020 | mod->state = MODULE_STATE_GOING; |
Paul E. McKenney | fbd568a3e | 2005-05-01 08:59:04 -0700 | [diff] [blame] | 3021 | synchronize_sched(); |
Rusty Russell | af49d92 | 2007-10-16 23:26:27 -0700 | [diff] [blame] | 3022 | module_put(mod); |
Peter Oberparleiter | df4b565 | 2008-04-21 14:34:31 +0200 | [diff] [blame] | 3023 | blocking_notifier_call_chain(&module_notify_list, |
| 3024 | MODULE_STATE_GOING, mod); |
Rusty Russell | af49d92 | 2007-10-16 23:26:27 -0700 | [diff] [blame] | 3025 | free_module(mod); |
Rusty Russell | 6f13909 | 2012-09-28 14:31:03 +0930 | [diff] [blame] | 3026 | wake_up_all(&module_wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3027 | return ret; |
| 3028 | } |
Alexey Dobriyan | e24e2e6 | 2008-03-10 11:43:53 -0700 | [diff] [blame] | 3029 | if (ret > 0) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 3030 | pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
| 3031 | "follow 0/-E convention\n" |
| 3032 | "%s: loading module anyway...\n", |
| 3033 | __func__, mod->name, ret, __func__); |
Alexey Dobriyan | e24e2e6 | 2008-03-10 11:43:53 -0700 | [diff] [blame] | 3034 | dump_stack(); |
| 3035 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3036 | |
Rusty Russell | 6f13909 | 2012-09-28 14:31:03 +0930 | [diff] [blame] | 3037 | /* Now it's a first class citizen! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3038 | mod->state = MODULE_STATE_LIVE; |
Masami Hiramatsu | 0deddf43 | 2009-01-06 14:41:54 -0800 | [diff] [blame] | 3039 | blocking_notifier_call_chain(&module_notify_list, |
| 3040 | MODULE_STATE_LIVE, mod); |
Rusty Russell | 6c5db22 | 2008-03-10 11:43:52 -0700 | [diff] [blame] | 3041 | |
Tejun Heo | 774a122 | 2013-01-15 18:52:51 -0800 | [diff] [blame] | 3042 | /* |
| 3043 | * We need to finish all async code before the module init sequence |
| 3044 | * is done. This has potential to deadlock. For example, a newly |
| 3045 | * detected block device can trigger request_module() of the |
| 3046 | * default iosched from async probing task. Once userland helper |
| 3047 | * reaches here, async_synchronize_full() will wait on the async |
| 3048 | * task waiting on request_module() and deadlock. |
| 3049 | * |
| 3050 | * This deadlock is avoided by perfomring async_synchronize_full() |
| 3051 | * iff module init queued any async jobs. This isn't a full |
| 3052 | * solution as it will deadlock the same if module loading from |
| 3053 | * async jobs nests more than once; however, due to the various |
| 3054 | * constraints, this hack seems to be the best option for now. |
| 3055 | * Please refer to the following thread for details. |
| 3056 | * |
| 3057 | * http://thread.gmane.org/gmane.linux.kernel/1420814 |
| 3058 | */ |
| 3059 | if (current->flags & PF_USED_ASYNC) |
| 3060 | async_synchronize_full(); |
Linus Torvalds | d6de2c8 | 2009-04-10 12:17:41 -0700 | [diff] [blame] | 3061 | |
Rusty Russell | 6c5db22 | 2008-03-10 11:43:52 -0700 | [diff] [blame] | 3062 | mutex_lock(&module_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3063 | /* Drop initial reference. */ |
| 3064 | module_put(mod); |
Rusty Russell | ad6561d | 2009-06-12 21:47:03 -0600 | [diff] [blame] | 3065 | trim_init_extable(mod); |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 3066 | #ifdef CONFIG_KALLSYMS |
| 3067 | mod->num_symtab = mod->core_num_syms; |
| 3068 | mod->symtab = mod->core_symtab; |
Jan Beulich | 554bdfe | 2009-07-06 14:51:44 +0100 | [diff] [blame] | 3069 | mod->strtab = mod->core_strtab; |
Jan Beulich | 4a49622 | 2009-07-06 14:50:42 +0100 | [diff] [blame] | 3070 | #endif |
Jan Glauber | 01526ed | 2011-05-19 16:55:26 -0600 | [diff] [blame] | 3071 | unset_module_init_ro_nx(mod); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3072 | module_free(mod, mod->module_init); |
| 3073 | mod->module_init = NULL; |
| 3074 | mod->init_size = 0; |
Jan Glauber | 4d10380 | 2011-05-19 16:55:25 -0600 | [diff] [blame] | 3075 | mod->init_ro_size = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3076 | mod->init_text_size = 0; |
Ashutosh Naik | 6389a38 | 2006-03-23 03:00:46 -0800 | [diff] [blame] | 3077 | mutex_unlock(&module_mutex); |
Rusty Russell | 6f13909 | 2012-09-28 14:31:03 +0930 | [diff] [blame] | 3078 | wake_up_all(&module_wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3079 | |
| 3080 | return 0; |
| 3081 | } |
| 3082 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3083 | static int may_init_module(void) |
| 3084 | { |
| 3085 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
| 3086 | return -EPERM; |
| 3087 | |
| 3088 | return 0; |
| 3089 | } |
| 3090 | |
Rusty Russell | a3535c7 | 2013-01-21 17:18:59 +1030 | [diff] [blame] | 3091 | /* |
| 3092 | * We try to place it in the list now to make sure it's unique before |
| 3093 | * we dedicate too many resources. In particular, temporary percpu |
| 3094 | * memory exhaustion. |
| 3095 | */ |
| 3096 | static int add_unformed_module(struct module *mod) |
| 3097 | { |
| 3098 | int err; |
| 3099 | struct module *old; |
| 3100 | |
| 3101 | mod->state = MODULE_STATE_UNFORMED; |
| 3102 | |
| 3103 | again: |
| 3104 | mutex_lock(&module_mutex); |
Mathias Krause | 4f6de4d | 2013-07-02 15:35:11 +0930 | [diff] [blame] | 3105 | old = find_module_all(mod->name, strlen(mod->name), true); |
| 3106 | if (old != NULL) { |
Rusty Russell | a3535c7 | 2013-01-21 17:18:59 +1030 | [diff] [blame] | 3107 | if (old->state == MODULE_STATE_COMING |
| 3108 | || old->state == MODULE_STATE_UNFORMED) { |
| 3109 | /* Wait in case it fails to load. */ |
| 3110 | mutex_unlock(&module_mutex); |
| 3111 | err = wait_event_interruptible(module_wq, |
| 3112 | finished_loading(mod->name)); |
| 3113 | if (err) |
| 3114 | goto out_unlocked; |
| 3115 | goto again; |
| 3116 | } |
| 3117 | err = -EEXIST; |
| 3118 | goto out; |
| 3119 | } |
| 3120 | list_add_rcu(&mod->list, &modules); |
| 3121 | err = 0; |
| 3122 | |
| 3123 | out: |
| 3124 | mutex_unlock(&module_mutex); |
| 3125 | out_unlocked: |
| 3126 | return err; |
| 3127 | } |
| 3128 | |
| 3129 | static int complete_formation(struct module *mod, struct load_info *info) |
| 3130 | { |
| 3131 | int err; |
| 3132 | |
| 3133 | mutex_lock(&module_mutex); |
| 3134 | |
| 3135 | /* Find duplicate symbols (must be called under lock). */ |
| 3136 | err = verify_export_symbols(mod); |
| 3137 | if (err < 0) |
| 3138 | goto out; |
| 3139 | |
| 3140 | /* This relies on module_mutex for list integrity. */ |
| 3141 | module_bug_finalize(info->hdr, info->sechdrs, mod); |
| 3142 | |
Rusty Russell | 4982223 | 2014-05-14 10:54:19 +0930 | [diff] [blame] | 3143 | /* Set RO and NX regions for core */ |
| 3144 | set_section_ro_nx(mod->module_core, |
| 3145 | mod->core_text_size, |
| 3146 | mod->core_ro_size, |
| 3147 | mod->core_size); |
| 3148 | |
| 3149 | /* Set RO and NX regions for init */ |
| 3150 | set_section_ro_nx(mod->module_init, |
| 3151 | mod->init_text_size, |
| 3152 | mod->init_ro_size, |
| 3153 | mod->init_size); |
| 3154 | |
Rusty Russell | a3535c7 | 2013-01-21 17:18:59 +1030 | [diff] [blame] | 3155 | /* Mark state as coming so strong_try_module_get() ignores us, |
| 3156 | * but kallsyms etc. can see us. */ |
| 3157 | mod->state = MODULE_STATE_COMING; |
Rusty Russell | 4982223 | 2014-05-14 10:54:19 +0930 | [diff] [blame] | 3158 | mutex_unlock(&module_mutex); |
| 3159 | |
| 3160 | blocking_notifier_call_chain(&module_notify_list, |
| 3161 | MODULE_STATE_COMING, mod); |
| 3162 | return 0; |
Rusty Russell | a3535c7 | 2013-01-21 17:18:59 +1030 | [diff] [blame] | 3163 | |
| 3164 | out: |
| 3165 | mutex_unlock(&module_mutex); |
| 3166 | return err; |
| 3167 | } |
| 3168 | |
Rusty Russell | 54041d8 | 2013-07-02 15:35:12 +0930 | [diff] [blame] | 3169 | static int unknown_module_param_cb(char *param, char *val, const char *modname) |
| 3170 | { |
| 3171 | /* Check for magic 'dyndbg' arg */ |
| 3172 | int ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 3173 | if (ret != 0) |
| 3174 | pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); |
Rusty Russell | 54041d8 | 2013-07-02 15:35:12 +0930 | [diff] [blame] | 3175 | return 0; |
| 3176 | } |
| 3177 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3178 | /* Allocate and load the module: note that size of section 0 is always |
| 3179 | zero, and we rely on this for optional sections. */ |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 3180 | static int load_module(struct load_info *info, const char __user *uargs, |
| 3181 | int flags) |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3182 | { |
Rusty Russell | a3535c7 | 2013-01-21 17:18:59 +1030 | [diff] [blame] | 3183 | struct module *mod; |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3184 | long err; |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 3185 | char *after_dashes; |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3186 | |
| 3187 | err = module_sig_check(info); |
| 3188 | if (err) |
| 3189 | goto free_copy; |
| 3190 | |
| 3191 | err = elf_header_check(info); |
| 3192 | if (err) |
| 3193 | goto free_copy; |
| 3194 | |
| 3195 | /* Figure out module layout, and allocate all the memory. */ |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 3196 | mod = layout_and_allocate(info, flags); |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3197 | if (IS_ERR(mod)) { |
| 3198 | err = PTR_ERR(mod); |
| 3199 | goto free_copy; |
| 3200 | } |
| 3201 | |
Rusty Russell | a3535c7 | 2013-01-21 17:18:59 +1030 | [diff] [blame] | 3202 | /* Reserve our place in the list. */ |
| 3203 | err = add_unformed_module(mod); |
| 3204 | if (err) |
Rusty Russell | 1fb9341 | 2013-01-12 13:27:34 +1030 | [diff] [blame] | 3205 | goto free_module; |
Rusty Russell | 1fb9341 | 2013-01-12 13:27:34 +1030 | [diff] [blame] | 3206 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3207 | #ifdef CONFIG_MODULE_SIG |
| 3208 | mod->sig_ok = info->sig_ok; |
Rusty Russell | 64748a2 | 2013-01-21 17:03:02 +1030 | [diff] [blame] | 3209 | if (!mod->sig_ok) { |
Andrew Morton | bddb12b | 2013-11-12 15:11:28 -0800 | [diff] [blame] | 3210 | pr_notice_once("%s: module verification failed: signature " |
| 3211 | "and/or required key missing - tainting " |
| 3212 | "kernel\n", mod->name); |
Mathieu Desnoyers | 66cc69e | 2014-03-13 12:11:30 +1030 | [diff] [blame] | 3213 | add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
Rusty Russell | 64748a2 | 2013-01-21 17:03:02 +1030 | [diff] [blame] | 3214 | } |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3215 | #endif |
| 3216 | |
Rusty Russell | 8d8022e | 2013-07-03 10:06:28 +0930 | [diff] [blame] | 3217 | /* To avoid stressing percpu allocator, do this once we're unique. */ |
Rusty Russell | 9eb76d7 | 2013-07-03 10:06:29 +0930 | [diff] [blame] | 3218 | err = percpu_modalloc(mod, info); |
Rusty Russell | 8d8022e | 2013-07-03 10:06:28 +0930 | [diff] [blame] | 3219 | if (err) |
| 3220 | goto unlink_mod; |
| 3221 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3222 | /* Now module is in final location, initialize linked lists, etc. */ |
| 3223 | err = module_unload_init(mod); |
| 3224 | if (err) |
Rusty Russell | 1fb9341 | 2013-01-12 13:27:34 +1030 | [diff] [blame] | 3225 | goto unlink_mod; |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3226 | |
| 3227 | /* Now we've got everything in the final locations, we can |
| 3228 | * find optional sections. */ |
Frantisek Hrbata | eb3057d | 2013-10-14 18:08:46 +1030 | [diff] [blame] | 3229 | err = find_module_sections(mod, info); |
| 3230 | if (err) |
| 3231 | goto free_unload; |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3232 | |
| 3233 | err = check_module_license_and_versions(mod); |
| 3234 | if (err) |
| 3235 | goto free_unload; |
| 3236 | |
| 3237 | /* Set up MODINFO_ATTR fields */ |
| 3238 | setup_modinfo(mod, info); |
| 3239 | |
| 3240 | /* Fix up syms, so that st_value is a pointer to location. */ |
| 3241 | err = simplify_symbols(mod, info); |
| 3242 | if (err < 0) |
| 3243 | goto free_modinfo; |
| 3244 | |
| 3245 | err = apply_relocations(mod, info); |
| 3246 | if (err < 0) |
| 3247 | goto free_modinfo; |
| 3248 | |
| 3249 | err = post_relocation(mod, info); |
| 3250 | if (err < 0) |
| 3251 | goto free_modinfo; |
| 3252 | |
| 3253 | flush_module_icache(mod); |
| 3254 | |
| 3255 | /* Now copy in args */ |
| 3256 | mod->args = strndup_user(uargs, ~0UL >> 1); |
| 3257 | if (IS_ERR(mod->args)) { |
| 3258 | err = PTR_ERR(mod->args); |
| 3259 | goto free_arch_cleanup; |
| 3260 | } |
| 3261 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3262 | dynamic_debug_setup(info->debug, info->num_debug); |
| 3263 | |
Steven Rostedt (Red Hat) | a949ae5 | 2014-04-24 10:40:12 -0400 | [diff] [blame] | 3264 | /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
| 3265 | ftrace_module_init(mod); |
| 3266 | |
Rusty Russell | a3535c7 | 2013-01-21 17:18:59 +1030 | [diff] [blame] | 3267 | /* Finally it's fully formed, ready to start executing. */ |
| 3268 | err = complete_formation(mod, info); |
| 3269 | if (err) |
Rusty Russell | 1fb9341 | 2013-01-12 13:27:34 +1030 | [diff] [blame] | 3270 | goto ddebug_cleanup; |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3271 | |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3272 | /* Module is ready to execute: parsing args may do that. */ |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 3273 | after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
| 3274 | -32768, 32767, unknown_module_param_cb); |
| 3275 | if (IS_ERR(after_dashes)) { |
| 3276 | err = PTR_ERR(after_dashes); |
Rusty Russell | 1fb9341 | 2013-01-12 13:27:34 +1030 | [diff] [blame] | 3277 | goto bug_cleanup; |
Rusty Russell | 51e158c | 2014-04-28 11:34:33 +0930 | [diff] [blame] | 3278 | } else if (after_dashes) { |
| 3279 | pr_warn("%s: parameters '%s' after `--' ignored\n", |
| 3280 | mod->name, after_dashes); |
| 3281 | } |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3282 | |
| 3283 | /* Link in to syfs. */ |
| 3284 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
| 3285 | if (err < 0) |
Rusty Russell | 1fb9341 | 2013-01-12 13:27:34 +1030 | [diff] [blame] | 3286 | goto bug_cleanup; |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3287 | |
| 3288 | /* Get rid of temporary copy. */ |
| 3289 | free_copy(info); |
| 3290 | |
| 3291 | /* Done! */ |
| 3292 | trace_module_load(mod); |
| 3293 | |
| 3294 | return do_init_module(mod); |
| 3295 | |
Rusty Russell | 1fb9341 | 2013-01-12 13:27:34 +1030 | [diff] [blame] | 3296 | bug_cleanup: |
| 3297 | /* module_bug_cleanup needs module_mutex protection */ |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3298 | mutex_lock(&module_mutex); |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3299 | module_bug_cleanup(mod); |
Linus Torvalds | ee61abb | 2013-01-20 20:22:58 -0800 | [diff] [blame] | 3300 | mutex_unlock(&module_mutex); |
Andy Lutomirski | ff7e005 | 2014-08-16 04:13:37 +0930 | [diff] [blame] | 3301 | |
| 3302 | /* we can't deallocate the module until we clear memory protection */ |
| 3303 | unset_module_init_ro_nx(mod); |
| 3304 | unset_module_core_ro_nx(mod); |
| 3305 | |
Rusty Russell | a3535c7 | 2013-01-21 17:18:59 +1030 | [diff] [blame] | 3306 | ddebug_cleanup: |
Rusty Russell | 1fb9341 | 2013-01-12 13:27:34 +1030 | [diff] [blame] | 3307 | dynamic_debug_remove(info->debug); |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3308 | synchronize_sched(); |
| 3309 | kfree(mod->args); |
| 3310 | free_arch_cleanup: |
| 3311 | module_arch_cleanup(mod); |
| 3312 | free_modinfo: |
| 3313 | free_modinfo(mod); |
| 3314 | free_unload: |
| 3315 | module_unload_free(mod); |
Rusty Russell | 1fb9341 | 2013-01-12 13:27:34 +1030 | [diff] [blame] | 3316 | unlink_mod: |
| 3317 | mutex_lock(&module_mutex); |
| 3318 | /* Unlink carefully: kallsyms could be walking list. */ |
| 3319 | list_del_rcu(&mod->list); |
| 3320 | wake_up_all(&module_wq); |
Masami Hiramatsu | 4f48795 | 2014-11-10 09:26:29 +1030 | [diff] [blame] | 3321 | /* Wait for RCU synchronizing before releasing mod->list. */ |
| 3322 | synchronize_rcu(); |
Rusty Russell | 1fb9341 | 2013-01-12 13:27:34 +1030 | [diff] [blame] | 3323 | mutex_unlock(&module_mutex); |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3324 | free_module: |
| 3325 | module_deallocate(mod, info); |
| 3326 | free_copy: |
| 3327 | free_copy(info); |
| 3328 | return err; |
| 3329 | } |
| 3330 | |
| 3331 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
| 3332 | unsigned long, len, const char __user *, uargs) |
| 3333 | { |
| 3334 | int err; |
| 3335 | struct load_info info = { }; |
| 3336 | |
| 3337 | err = may_init_module(); |
| 3338 | if (err) |
| 3339 | return err; |
| 3340 | |
| 3341 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
| 3342 | umod, len, uargs); |
| 3343 | |
| 3344 | err = copy_module_from_user(umod, len, &info); |
| 3345 | if (err) |
| 3346 | return err; |
| 3347 | |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 3348 | return load_module(&info, uargs, 0); |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3349 | } |
| 3350 | |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 3351 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3352 | { |
| 3353 | int err; |
| 3354 | struct load_info info = { }; |
| 3355 | |
| 3356 | err = may_init_module(); |
| 3357 | if (err) |
| 3358 | return err; |
| 3359 | |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 3360 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
| 3361 | |
| 3362 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
| 3363 | |MODULE_INIT_IGNORE_VERMAGIC)) |
| 3364 | return -EINVAL; |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3365 | |
| 3366 | err = copy_module_from_fd(fd, &info); |
| 3367 | if (err) |
| 3368 | return err; |
| 3369 | |
Rusty Russell | 2f3238a | 2012-10-22 18:09:41 +1030 | [diff] [blame] | 3370 | return load_module(&info, uargs, flags); |
Kees Cook | 34e1169 | 2012-10-16 07:31:07 +1030 | [diff] [blame] | 3371 | } |
| 3372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3373 | static inline int within(unsigned long addr, void *start, unsigned long size) |
| 3374 | { |
| 3375 | return ((void *)addr >= start && (void *)addr < start + size); |
| 3376 | } |
| 3377 | |
| 3378 | #ifdef CONFIG_KALLSYMS |
| 3379 | /* |
| 3380 | * This ignores the intensely annoying "mapping symbols" found |
| 3381 | * in ARM ELF files: $a, $t and $d. |
| 3382 | */ |
| 3383 | static inline int is_arm_mapping_symbol(const char *str) |
| 3384 | { |
Russell King | 2e3a10a | 2014-07-27 07:29:01 +0930 | [diff] [blame] | 3385 | if (str[0] == '.' && str[1] == 'L') |
| 3386 | return true; |
Kyle McMartin | 6c34f1f | 2014-09-16 22:37:18 +0100 | [diff] [blame] | 3387 | return str[0] == '$' && strchr("axtd", str[1]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3388 | && (str[2] == '\0' || str[2] == '.'); |
| 3389 | } |
| 3390 | |
| 3391 | static const char *get_ksymbol(struct module *mod, |
| 3392 | unsigned long addr, |
| 3393 | unsigned long *size, |
| 3394 | unsigned long *offset) |
| 3395 | { |
| 3396 | unsigned int i, best = 0; |
| 3397 | unsigned long nextval; |
| 3398 | |
| 3399 | /* At worse, next value is at end of module */ |
Masami Hiramatsu | a06f621 | 2009-01-06 14:41:49 -0800 | [diff] [blame] | 3400 | if (within_module_init(addr, mod)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3401 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 3402 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3403 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
| 3404 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3405 | /* Scan for closest preceding symbol, and next symbol. (ELF |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 3406 | starts real symbols at 1). */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3407 | for (i = 1; i < mod->num_symtab; i++) { |
| 3408 | if (mod->symtab[i].st_shndx == SHN_UNDEF) |
| 3409 | continue; |
| 3410 | |
| 3411 | /* We ignore unnamed symbols: they're uninformative |
| 3412 | * and inserted at a whim. */ |
| 3413 | if (mod->symtab[i].st_value <= addr |
| 3414 | && mod->symtab[i].st_value > mod->symtab[best].st_value |
| 3415 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' |
| 3416 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) |
| 3417 | best = i; |
| 3418 | if (mod->symtab[i].st_value > addr |
| 3419 | && mod->symtab[i].st_value < nextval |
| 3420 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' |
| 3421 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) |
| 3422 | nextval = mod->symtab[i].st_value; |
| 3423 | } |
| 3424 | |
| 3425 | if (!best) |
| 3426 | return NULL; |
| 3427 | |
Alexey Dobriyan | ffb4512 | 2007-05-08 00:28:41 -0700 | [diff] [blame] | 3428 | if (size) |
| 3429 | *size = nextval - mod->symtab[best].st_value; |
| 3430 | if (offset) |
| 3431 | *offset = addr - mod->symtab[best].st_value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3432 | return mod->strtab + mod->symtab[best].st_name; |
| 3433 | } |
| 3434 | |
Rusty Russell | 6dd06c9 | 2008-01-29 17:13:22 -0500 | [diff] [blame] | 3435 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
| 3436 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ |
Andrew Morton | 92dfc9d | 2008-02-08 04:18:43 -0800 | [diff] [blame] | 3437 | const char *module_address_lookup(unsigned long addr, |
Rusty Russell | 6dd06c9 | 2008-01-29 17:13:22 -0500 | [diff] [blame] | 3438 | unsigned long *size, |
| 3439 | unsigned long *offset, |
| 3440 | char **modname, |
| 3441 | char *namebuf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3442 | { |
| 3443 | struct module *mod; |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3444 | const char *ret = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3445 | |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3446 | preempt_disable(); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 3447 | list_for_each_entry_rcu(mod, &modules, list) { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3448 | if (mod->state == MODULE_STATE_UNFORMED) |
| 3449 | continue; |
Petr Mladek | 9b20a35 | 2014-07-27 07:24:01 +0930 | [diff] [blame] | 3450 | if (within_module(addr, mod)) { |
Franck Bui-Huu | ffc5089 | 2006-10-03 01:13:48 -0700 | [diff] [blame] | 3451 | if (modname) |
| 3452 | *modname = mod->name; |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3453 | ret = get_ksymbol(mod, addr, size, offset); |
| 3454 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3455 | } |
| 3456 | } |
Rusty Russell | 6dd06c9 | 2008-01-29 17:13:22 -0500 | [diff] [blame] | 3457 | /* Make a copy in here where it's safe */ |
| 3458 | if (ret) { |
| 3459 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); |
| 3460 | ret = namebuf; |
| 3461 | } |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3462 | preempt_enable(); |
Andrew Morton | 92dfc9d | 2008-02-08 04:18:43 -0800 | [diff] [blame] | 3463 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3464 | } |
| 3465 | |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 3466 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
| 3467 | { |
| 3468 | struct module *mod; |
| 3469 | |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3470 | preempt_disable(); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 3471 | list_for_each_entry_rcu(mod, &modules, list) { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3472 | if (mod->state == MODULE_STATE_UNFORMED) |
| 3473 | continue; |
Petr Mladek | 9b20a35 | 2014-07-27 07:24:01 +0930 | [diff] [blame] | 3474 | if (within_module(addr, mod)) { |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 3475 | const char *sym; |
| 3476 | |
| 3477 | sym = get_ksymbol(mod, addr, NULL, NULL); |
| 3478 | if (!sym) |
| 3479 | goto out; |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 3480 | strlcpy(symname, sym, KSYM_NAME_LEN); |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3481 | preempt_enable(); |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 3482 | return 0; |
| 3483 | } |
| 3484 | } |
| 3485 | out: |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3486 | preempt_enable(); |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 3487 | return -ERANGE; |
| 3488 | } |
| 3489 | |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 3490 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
| 3491 | unsigned long *offset, char *modname, char *name) |
| 3492 | { |
| 3493 | struct module *mod; |
| 3494 | |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3495 | preempt_disable(); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 3496 | list_for_each_entry_rcu(mod, &modules, list) { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3497 | if (mod->state == MODULE_STATE_UNFORMED) |
| 3498 | continue; |
Petr Mladek | 9b20a35 | 2014-07-27 07:24:01 +0930 | [diff] [blame] | 3499 | if (within_module(addr, mod)) { |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 3500 | const char *sym; |
| 3501 | |
| 3502 | sym = get_ksymbol(mod, addr, size, offset); |
| 3503 | if (!sym) |
| 3504 | goto out; |
| 3505 | if (modname) |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 3506 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 3507 | if (name) |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 3508 | strlcpy(name, sym, KSYM_NAME_LEN); |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3509 | preempt_enable(); |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 3510 | return 0; |
| 3511 | } |
| 3512 | } |
| 3513 | out: |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3514 | preempt_enable(); |
Alexey Dobriyan | a5c43da | 2007-05-08 00:28:47 -0700 | [diff] [blame] | 3515 | return -ERANGE; |
| 3516 | } |
| 3517 | |
Alexey Dobriyan | ea07890 | 2007-05-08 00:28:39 -0700 | [diff] [blame] | 3518 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
| 3519 | char *name, char *module_name, int *exported) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3520 | { |
| 3521 | struct module *mod; |
| 3522 | |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3523 | preempt_disable(); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 3524 | list_for_each_entry_rcu(mod, &modules, list) { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3525 | if (mod->state == MODULE_STATE_UNFORMED) |
| 3526 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3527 | if (symnum < mod->num_symtab) { |
| 3528 | *value = mod->symtab[symnum].st_value; |
| 3529 | *type = mod->symtab[symnum].st_info; |
Andreas Gruenbacher | 098c5ee | 2006-07-14 00:24:04 -0700 | [diff] [blame] | 3530 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 3531 | KSYM_NAME_LEN); |
| 3532 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
Tim Abbott | ca4787b | 2009-01-05 08:40:10 -0600 | [diff] [blame] | 3533 | *exported = is_exported(name, *value, mod); |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3534 | preempt_enable(); |
Alexey Dobriyan | ea07890 | 2007-05-08 00:28:39 -0700 | [diff] [blame] | 3535 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3536 | } |
| 3537 | symnum -= mod->num_symtab; |
| 3538 | } |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3539 | preempt_enable(); |
Alexey Dobriyan | ea07890 | 2007-05-08 00:28:39 -0700 | [diff] [blame] | 3540 | return -ERANGE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3541 | } |
| 3542 | |
| 3543 | static unsigned long mod_find_symname(struct module *mod, const char *name) |
| 3544 | { |
| 3545 | unsigned int i; |
| 3546 | |
| 3547 | for (i = 0; i < mod->num_symtab; i++) |
Keith Owens | 54e8ce4 | 2006-02-03 03:03:53 -0800 | [diff] [blame] | 3548 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
| 3549 | mod->symtab[i].st_info != 'U') |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3550 | return mod->symtab[i].st_value; |
| 3551 | return 0; |
| 3552 | } |
| 3553 | |
| 3554 | /* Look for this name: can be of form module:name. */ |
| 3555 | unsigned long module_kallsyms_lookup_name(const char *name) |
| 3556 | { |
| 3557 | struct module *mod; |
| 3558 | char *colon; |
| 3559 | unsigned long ret = 0; |
| 3560 | |
| 3561 | /* Don't lock: we're in enough trouble already. */ |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3562 | preempt_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3563 | if ((colon = strchr(name, ':')) != NULL) { |
Mathias Krause | 4f6de4d | 2013-07-02 15:35:11 +0930 | [diff] [blame] | 3564 | if ((mod = find_module_all(name, colon - name, false)) != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3565 | ret = mod_find_symname(mod, colon+1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3566 | } else { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3567 | list_for_each_entry_rcu(mod, &modules, list) { |
| 3568 | if (mod->state == MODULE_STATE_UNFORMED) |
| 3569 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3570 | if ((ret = mod_find_symname(mod, name)) != 0) |
| 3571 | break; |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3572 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3573 | } |
Rusty Russell | cb2a520 | 2008-01-14 00:55:03 -0800 | [diff] [blame] | 3574 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3575 | return ret; |
| 3576 | } |
Anders Kaseorg | 75a6661 | 2008-12-05 19:03:58 -0500 | [diff] [blame] | 3577 | |
| 3578 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, |
| 3579 | struct module *, unsigned long), |
| 3580 | void *data) |
| 3581 | { |
| 3582 | struct module *mod; |
| 3583 | unsigned int i; |
| 3584 | int ret; |
| 3585 | |
| 3586 | list_for_each_entry(mod, &modules, list) { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3587 | if (mod->state == MODULE_STATE_UNFORMED) |
| 3588 | continue; |
Anders Kaseorg | 75a6661 | 2008-12-05 19:03:58 -0500 | [diff] [blame] | 3589 | for (i = 0; i < mod->num_symtab; i++) { |
| 3590 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, |
| 3591 | mod, mod->symtab[i].st_value); |
| 3592 | if (ret != 0) |
| 3593 | return ret; |
| 3594 | } |
| 3595 | } |
| 3596 | return 0; |
| 3597 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3598 | #endif /* CONFIG_KALLSYMS */ |
| 3599 | |
Arjan van de Ven | 21aa928 | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 3600 | static char *module_flags(struct module *mod, char *buf) |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 3601 | { |
| 3602 | int bx = 0; |
| 3603 | |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3604 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
Arjan van de Ven | 21aa928 | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 3605 | if (mod->taints || |
| 3606 | mod->state == MODULE_STATE_GOING || |
| 3607 | mod->state == MODULE_STATE_COMING) { |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 3608 | buf[bx++] = '('; |
Kay Sievers | cca3e70 | 2012-01-13 09:32:15 +1030 | [diff] [blame] | 3609 | bx += module_flags_taint(mod, buf + bx); |
Arjan van de Ven | 21aa928 | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 3610 | /* Show a - for module-is-being-unloaded */ |
| 3611 | if (mod->state == MODULE_STATE_GOING) |
| 3612 | buf[bx++] = '-'; |
| 3613 | /* Show a + for module-is-being-loaded */ |
| 3614 | if (mod->state == MODULE_STATE_COMING) |
| 3615 | buf[bx++] = '+'; |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 3616 | buf[bx++] = ')'; |
| 3617 | } |
| 3618 | buf[bx] = '\0'; |
| 3619 | |
| 3620 | return buf; |
| 3621 | } |
| 3622 | |
Alexey Dobriyan | 3b5d5c6 | 2008-10-06 13:19:27 +0400 | [diff] [blame] | 3623 | #ifdef CONFIG_PROC_FS |
| 3624 | /* Called by the /proc file system to return a list of modules. */ |
| 3625 | static void *m_start(struct seq_file *m, loff_t *pos) |
| 3626 | { |
| 3627 | mutex_lock(&module_mutex); |
| 3628 | return seq_list_start(&modules, *pos); |
| 3629 | } |
| 3630 | |
| 3631 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) |
| 3632 | { |
| 3633 | return seq_list_next(p, &modules, pos); |
| 3634 | } |
| 3635 | |
| 3636 | static void m_stop(struct seq_file *m, void *p) |
| 3637 | { |
| 3638 | mutex_unlock(&module_mutex); |
| 3639 | } |
| 3640 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3641 | static int m_show(struct seq_file *m, void *p) |
| 3642 | { |
| 3643 | struct module *mod = list_entry(p, struct module, list); |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 3644 | char buf[8]; |
| 3645 | |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3646 | /* We always ignore unformed modules. */ |
| 3647 | if (mod->state == MODULE_STATE_UNFORMED) |
| 3648 | return 0; |
| 3649 | |
Denys Vlasenko | 2f0f2a3 | 2008-07-22 19:24:27 -0500 | [diff] [blame] | 3650 | seq_printf(m, "%s %u", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3651 | mod->name, mod->init_size + mod->core_size); |
| 3652 | print_unload_info(m, mod); |
| 3653 | |
| 3654 | /* Informative for users. */ |
| 3655 | seq_printf(m, " %s", |
| 3656 | mod->state == MODULE_STATE_GOING ? "Unloading": |
| 3657 | mod->state == MODULE_STATE_COMING ? "Loading": |
| 3658 | "Live"); |
| 3659 | /* Used by oprofile and other similar tools. */ |
Kees Cook | 9f36e2c | 2011-03-22 16:34:22 -0700 | [diff] [blame] | 3660 | seq_printf(m, " 0x%pK", mod->module_core); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3661 | |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 3662 | /* Taints info */ |
| 3663 | if (mod->taints) |
Arjan van de Ven | 21aa928 | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 3664 | seq_printf(m, " %s", module_flags(mod, buf)); |
Florin Malita | fa3ba2e8 | 2006-10-11 01:21:48 -0700 | [diff] [blame] | 3665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3666 | seq_printf(m, "\n"); |
| 3667 | return 0; |
| 3668 | } |
| 3669 | |
| 3670 | /* Format: modulename size refcount deps address |
| 3671 | |
| 3672 | Where refcount is a number or -, and deps is a comma-separated list |
| 3673 | of depends or -. |
| 3674 | */ |
Alexey Dobriyan | 3b5d5c6 | 2008-10-06 13:19:27 +0400 | [diff] [blame] | 3675 | static const struct seq_operations modules_op = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3676 | .start = m_start, |
| 3677 | .next = m_next, |
| 3678 | .stop = m_stop, |
| 3679 | .show = m_show |
| 3680 | }; |
| 3681 | |
Alexey Dobriyan | 3b5d5c6 | 2008-10-06 13:19:27 +0400 | [diff] [blame] | 3682 | static int modules_open(struct inode *inode, struct file *file) |
| 3683 | { |
| 3684 | return seq_open(file, &modules_op); |
| 3685 | } |
| 3686 | |
| 3687 | static const struct file_operations proc_modules_operations = { |
| 3688 | .open = modules_open, |
| 3689 | .read = seq_read, |
| 3690 | .llseek = seq_lseek, |
| 3691 | .release = seq_release, |
| 3692 | }; |
| 3693 | |
| 3694 | static int __init proc_modules_init(void) |
| 3695 | { |
| 3696 | proc_create("modules", 0, NULL, &proc_modules_operations); |
| 3697 | return 0; |
| 3698 | } |
| 3699 | module_init(proc_modules_init); |
| 3700 | #endif |
| 3701 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3702 | /* Given an address, look for it in the module exception tables. */ |
| 3703 | const struct exception_table_entry *search_module_extables(unsigned long addr) |
| 3704 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3705 | const struct exception_table_entry *e = NULL; |
| 3706 | struct module *mod; |
| 3707 | |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 3708 | preempt_disable(); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 3709 | list_for_each_entry_rcu(mod, &modules, list) { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3710 | if (mod->state == MODULE_STATE_UNFORMED) |
| 3711 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3712 | if (mod->num_exentries == 0) |
| 3713 | continue; |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 3714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3715 | e = search_extable(mod->extable, |
| 3716 | mod->extable + mod->num_exentries - 1, |
| 3717 | addr); |
| 3718 | if (e) |
| 3719 | break; |
| 3720 | } |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 3721 | preempt_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3722 | |
| 3723 | /* Now, if we found one, we are running inside it now, hence |
Daniel Walker | 22a8bde | 2007-10-18 03:06:07 -0700 | [diff] [blame] | 3724 | we cannot unload the module, hence no refcnt needed. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3725 | return e; |
| 3726 | } |
| 3727 | |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 3728 | /* |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3729 | * is_module_address - is this address inside a module? |
| 3730 | * @addr: the address to check. |
| 3731 | * |
| 3732 | * See is_module_text_address() if you simply want to see if the address |
| 3733 | * is code (not data). |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 3734 | */ |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3735 | bool is_module_address(unsigned long addr) |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 3736 | { |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3737 | bool ret; |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 3738 | |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 3739 | preempt_disable(); |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3740 | ret = __module_address(addr) != NULL; |
Rusty Russell | 24da1cb | 2007-07-15 23:41:46 -0700 | [diff] [blame] | 3741 | preempt_enable(); |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 3742 | |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3743 | return ret; |
Ingo Molnar | 4d435f9 | 2006-07-03 00:24:24 -0700 | [diff] [blame] | 3744 | } |
| 3745 | |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3746 | /* |
| 3747 | * __module_address - get the module which contains an address. |
| 3748 | * @addr: the address. |
| 3749 | * |
| 3750 | * Must be called with preempt disabled or module mutex held so that |
| 3751 | * module doesn't get freed during this. |
| 3752 | */ |
Linus Torvalds | 714f83d | 2009-04-05 11:04:19 -0700 | [diff] [blame] | 3753 | struct module *__module_address(unsigned long addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3754 | { |
| 3755 | struct module *mod; |
| 3756 | |
Rusty Russell | 3a642e9 | 2008-07-22 19:24:28 -0500 | [diff] [blame] | 3757 | if (addr < module_addr_min || addr > module_addr_max) |
| 3758 | return NULL; |
| 3759 | |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3760 | list_for_each_entry_rcu(mod, &modules, list) { |
| 3761 | if (mod->state == MODULE_STATE_UNFORMED) |
| 3762 | continue; |
Petr Mladek | 9b20a35 | 2014-07-27 07:24:01 +0930 | [diff] [blame] | 3763 | if (within_module(addr, mod)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3764 | return mod; |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3765 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3766 | return NULL; |
| 3767 | } |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 3768 | EXPORT_SYMBOL_GPL(__module_address); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3769 | |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3770 | /* |
| 3771 | * is_module_text_address - is this address inside module code? |
| 3772 | * @addr: the address to check. |
| 3773 | * |
| 3774 | * See is_module_address() if you simply want to see if the address is |
| 3775 | * anywhere in a module. See kernel_text_address() for testing if an |
| 3776 | * address corresponds to kernel or module code. |
| 3777 | */ |
| 3778 | bool is_module_text_address(unsigned long addr) |
| 3779 | { |
| 3780 | bool ret; |
| 3781 | |
| 3782 | preempt_disable(); |
| 3783 | ret = __module_text_address(addr) != NULL; |
| 3784 | preempt_enable(); |
| 3785 | |
| 3786 | return ret; |
| 3787 | } |
| 3788 | |
| 3789 | /* |
| 3790 | * __module_text_address - get the module whose code contains an address. |
| 3791 | * @addr: the address. |
| 3792 | * |
| 3793 | * Must be called with preempt disabled or module mutex held so that |
| 3794 | * module doesn't get freed during this. |
| 3795 | */ |
| 3796 | struct module *__module_text_address(unsigned long addr) |
| 3797 | { |
| 3798 | struct module *mod = __module_address(addr); |
| 3799 | if (mod) { |
| 3800 | /* Make sure it's within the text section. */ |
| 3801 | if (!within(addr, mod->module_init, mod->init_text_size) |
| 3802 | && !within(addr, mod->module_core, mod->core_text_size)) |
| 3803 | mod = NULL; |
| 3804 | } |
| 3805 | return mod; |
| 3806 | } |
Tim Abbott | c6b3780 | 2008-12-05 19:03:59 -0500 | [diff] [blame] | 3807 | EXPORT_SYMBOL_GPL(__module_text_address); |
Rusty Russell | e610499 | 2009-03-31 13:05:31 -0600 | [diff] [blame] | 3808 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3809 | /* Don't grab lock, we're oopsing. */ |
| 3810 | void print_modules(void) |
| 3811 | { |
| 3812 | struct module *mod; |
Randy Dunlap | 2bc2d61 | 2006-10-02 02:17:02 -0700 | [diff] [blame] | 3813 | char buf[8]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3814 | |
Linus Torvalds | b231125 | 2009-06-16 11:07:14 -0700 | [diff] [blame] | 3815 | printk(KERN_DEFAULT "Modules linked in:"); |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 3816 | /* Most callers should already have preempt disabled, but make sure */ |
| 3817 | preempt_disable(); |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3818 | list_for_each_entry_rcu(mod, &modules, list) { |
| 3819 | if (mod->state == MODULE_STATE_UNFORMED) |
| 3820 | continue; |
Jiri Slaby | 27bba4d | 2014-02-03 11:13:13 +1030 | [diff] [blame] | 3821 | pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 3822 | } |
Andi Kleen | d72b375 | 2008-08-30 10:09:00 +0200 | [diff] [blame] | 3823 | preempt_enable(); |
Arjan van de Ven | e14af7e | 2008-01-25 21:08:33 +0100 | [diff] [blame] | 3824 | if (last_unloaded_module[0]) |
Jiri Slaby | 27bba4d | 2014-02-03 11:13:13 +1030 | [diff] [blame] | 3825 | pr_cont(" [last unloaded: %s]", last_unloaded_module); |
| 3826 | pr_cont("\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3827 | } |
| 3828 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3829 | #ifdef CONFIG_MODVERSIONS |
Rusty Russell | 8c8ef42 | 2009-03-31 13:05:34 -0600 | [diff] [blame] | 3830 | /* Generate the signature for all relevant module structures here. |
| 3831 | * If these change, we don't want to try to parse the module. */ |
| 3832 | void module_layout(struct module *mod, |
| 3833 | struct modversion_info *ver, |
| 3834 | struct kernel_param *kp, |
| 3835 | struct kernel_symbol *ks, |
Mathieu Desnoyers | 6549864 | 2011-01-26 17:26:22 -0500 | [diff] [blame] | 3836 | struct tracepoint * const *tp) |
Rusty Russell | 8c8ef42 | 2009-03-31 13:05:34 -0600 | [diff] [blame] | 3837 | { |
| 3838 | } |
| 3839 | EXPORT_SYMBOL(module_layout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3840 | #endif |