blob: bed608b8c8a6842fa016dd7fa1afe23231667874 [file] [log] [blame]
Arjan van de Venf71d20e2006-06-28 04:26:45 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 Copyright (C) 2002 Richard Henderson
Rusty Russell51f3d0f2010-08-05 12:59:13 -06003 Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004
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 Gortmaker9984de12011-05-23 14:51:41 -040019#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/moduleloader.h>
Steven Rostedt6d723732009-04-10 14:53:50 -040021#include <linux/ftrace_event.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/init.h>
Alexey Dobriyanae84e322007-05-08 00:28:38 -070023#include <linux/kallsyms.h>
Kees Cook34e11692012-10-16 07:31:07 +103024#include <linux/file.h>
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +040025#include <linux/fs.h>
Roland McGrath6d760132007-10-16 23:26:40 -070026#include <linux/sysfs.h>
Randy Dunlap9f158332005-09-13 01:25:16 -070027#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/slab.h>
29#include <linux/vmalloc.h>
30#include <linux/elf.h>
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +040031#include <linux/proc_fs.h>
Kees Cook2e72d512012-10-16 07:32:07 +103032#include <linux/security.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/seq_file.h>
34#include <linux/syscalls.h>
35#include <linux/fcntl.h>
36#include <linux/rcupdate.h>
Randy.Dunlapc59ede72006-01-11 12:17:46 -080037#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#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 Virof6a57032006-10-18 01:47:25 -040044#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/stop_machine.h>
46#include <linux/device.h>
Matt Domschc988d2b2005-06-23 22:05:15 -070047#include <linux/string.h>
Arjan van de Ven97d1f152006-03-23 03:00:24 -080048#include <linux/mutex.h>
Andi Kleend72b3752008-08-30 10:09:00 +020049#include <linux/rculist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <asm/cacheflush.h>
Bernd Schmidteb8cdec2009-09-21 17:03:57 -070052#include <asm/mmu_context.h>
Sam Ravnborgb817f6f2006-06-09 21:53:55 +020053#include <linux/license.h>
Christoph Lameter6d762392008-02-08 04:18:42 -080054#include <asm/sections.h>
Mathieu Desnoyers97e1c182008-07-18 12:16:16 -040055#include <linux/tracepoint.h>
Steven Rostedt90d595f2008-08-14 15:45:09 -040056#include <linux/ftrace.h>
Arjan van de Ven22a9d642009-01-07 08:45:46 -080057#include <linux/async.h>
Tejun Heofbf59bc2009-02-20 16:29:08 +090058#include <linux/percpu.h>
Catalin Marinas4f2294b2009-06-11 13:23:20 +010059#include <linux/kmemleak.h>
Jason Baronbf5438fc2010-09-17 11:09:00 -040060#include <linux/jump_label.h>
matthieu castet84e1c6b2010-11-16 22:35:16 +010061#include <linux/pfn.h>
Alessio Igor Bogani403ed272011-04-20 11:10:52 +020062#include <linux/bsearch.h>
Rusty Russell2f3238a2012-10-22 18:09:41 +103063#include <uapi/linux/module.h>
Rusty Russell106a4ee2012-09-26 10:09:40 +010064#include "module-internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Li Zefan7ead8b82009-08-17 16:56:28 +080066#define CREATE_TRACE_POINTS
67#include <trace/events/module.h>
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#ifndef ARCH_SHF_SMALL
70#define ARCH_SHF_SMALL 0
71#endif
72
matthieu castet84e1c6b2010-11-16 22:35:16 +010073/*
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 Torvalds1da177e2005-04-16 15:20:36 -070093/* 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 Russell75676502010-06-05 11:17:36 -060096/*
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 Kleend72b3752008-08-30 10:09:00 +0200101 * (delete uses stop_machine/add uses RCU list operations). */
Tim Abbottc6b37802008-12-05 19:03:59 -0500102DEFINE_MUTEX(module_mutex);
103EXPORT_SYMBOL_GPL(module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104static LIST_HEAD(modules);
Jason Wessel67fc4e02010-05-20 21:04:21 -0500105#ifdef CONFIG_KGDB_KDB
106struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
107#endif /* CONFIG_KGDB_KDB */
108
Rusty Russell106a4ee2012-09-26 10:09:40 +0100109#ifdef CONFIG_MODULE_SIG
110#ifdef CONFIG_MODULE_SIG_FORCE
111static bool sig_enforce = true;
112#else
113static bool sig_enforce = false;
114
115static 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
137static const struct kernel_param_ops param_ops_bool_enable_only = {
Jani Nikula6a4c2642014-08-27 06:21:23 +0930138 .flags = KERNEL_PARAM_OPS_FL_NOARG,
Rusty Russell106a4ee2012-09-26 10:09:40 +0100139 .set = param_set_bool_enable_only,
140 .get = param_get_bool,
141};
142#define param_check_bool_enable_only param_check_bool
143
144module_param(sig_enforce, bool_enable_only, 0644);
145#endif /* !CONFIG_MODULE_SIG_FORCE */
146#endif /* CONFIG_MODULE_SIG */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Stephen Rothwell19e45292009-04-14 17:27:18 +1000148/* Block module loading/unloading? */
149int modules_disabled = 0;
Dave Young02608be2012-02-01 10:33:14 +0800150core_param(nomodule, modules_disabled, bint, 0);
Stephen Rothwell19e45292009-04-14 17:27:18 +1000151
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500152/* Waiting for a module to finish initializing? */
153static DECLARE_WAIT_QUEUE_HEAD(module_wq);
154
Alan Sterne041c682006-03-27 01:16:30 -0800155static BLOCKING_NOTIFIER_HEAD(module_notify_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
Rusty Russell75676502010-06-05 11:17:36 -0600157/* Bounds of module allocation, for speeding __module_address.
158 * Protected by module_mutex. */
Rusty Russell3a642e92008-07-22 19:24:28 -0500159static unsigned long module_addr_min = -1UL, module_addr_max = 0;
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161int register_module_notifier(struct notifier_block * nb)
162{
Alan Sterne041c682006-03-27 01:16:30 -0800163 return blocking_notifier_chain_register(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164}
165EXPORT_SYMBOL(register_module_notifier);
166
167int unregister_module_notifier(struct notifier_block * nb)
168{
Alan Sterne041c682006-03-27 01:16:30 -0800169 return blocking_notifier_chain_unregister(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171EXPORT_SYMBOL(unregister_module_notifier);
172
Rusty Russelleded41c2010-08-05 12:59:07 -0600173struct load_info {
174 Elf_Ehdr *hdr;
175 unsigned long len;
176 Elf_Shdr *sechdrs;
Rusty Russell6526c532010-08-05 12:59:10 -0600177 char *secstrings, *strtab;
Rusty Russelld9131882010-08-05 12:59:08 -0600178 unsigned long symoffs, stroffs;
Rusty Russell811d66a2010-08-05 12:59:12 -0600179 struct _ddebug *debug;
180 unsigned int num_debug;
Rusty Russell106a4ee2012-09-26 10:09:40 +0100181 bool sig_ok;
Rusty Russelleded41c2010-08-05 12:59:07 -0600182 struct {
183 unsigned int sym, str, mod, vers, info, pcpu;
184 } index;
185};
186
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -0800187/* We require a truly strong try_module_get(): 0 means failure due to
188 ongoing or failed initialization etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189static inline int strong_try_module_get(struct module *mod)
190{
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030191 BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 if (mod && mod->state == MODULE_STATE_COMING)
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500193 return -EBUSY;
194 if (try_module_get(mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 return 0;
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500196 else
197 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198}
199
Rusty Russell373d4d02013-01-21 17:17:39 +1030200static inline void add_taint_module(struct module *mod, unsigned flag,
201 enum lockdep_ok lockdep_ok)
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700202{
Rusty Russell373d4d02013-01-21 17:17:39 +1030203 add_taint(flag, lockdep_ok);
Andi Kleen25ddbb12008-10-15 22:01:41 -0700204 mod->taints |= (1U << flag);
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700205}
206
Robert P. J. Day02a3e592007-05-09 07:26:28 +0200207/*
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 Torvalds1da177e2005-04-16 15:20:36 -0700210 */
211void __module_put_and_exit(struct module *mod, long code)
212{
213 module_put(mod);
214 do_exit(code);
215}
216EXPORT_SYMBOL(__module_put_and_exit);
Daniel Walker22a8bde2007-10-18 03:06:07 -0700217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218/* Find a module section: 0 means not found. */
Rusty Russell49668682010-08-05 12:59:10 -0600219static unsigned int find_sec(const struct load_info *info, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
221 unsigned int i;
222
Rusty Russell49668682010-08-05 12:59:10 -0600223 for (i = 1; i < info->hdr->e_shnum; i++) {
224 Elf_Shdr *shdr = &info->sechdrs[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 /* Alloc bit cleared means "ignore it." */
Rusty Russell49668682010-08-05 12:59:10 -0600226 if ((shdr->sh_flags & SHF_ALLOC)
227 && strcmp(info->secstrings + shdr->sh_name, name) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 return i;
Rusty Russell49668682010-08-05 12:59:10 -0600229 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 return 0;
231}
232
Rusty Russell5e458cc2008-10-22 10:00:13 -0500233/* Find a module section, or NULL. */
Rusty Russell49668682010-08-05 12:59:10 -0600234static void *section_addr(const struct load_info *info, const char *name)
Rusty Russell5e458cc2008-10-22 10:00:13 -0500235{
236 /* Section 0 has sh_addr 0. */
Rusty Russell49668682010-08-05 12:59:10 -0600237 return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
Rusty Russell5e458cc2008-10-22 10:00:13 -0500238}
239
240/* Find a module section, or NULL. Fill in number of "objects" in section. */
Rusty Russell49668682010-08-05 12:59:10 -0600241static void *section_objs(const struct load_info *info,
Rusty Russell5e458cc2008-10-22 10:00:13 -0500242 const char *name,
243 size_t object_size,
244 unsigned int *num)
245{
Rusty Russell49668682010-08-05 12:59:10 -0600246 unsigned int sec = find_sec(info, name);
Rusty Russell5e458cc2008-10-22 10:00:13 -0500247
248 /* Section 0 has sh_addr 0 and sh_size 0. */
Rusty Russell49668682010-08-05 12:59:10 -0600249 *num = info->sechdrs[sec].sh_size / object_size;
250 return (void *)info->sechdrs[sec].sh_addr;
Rusty Russell5e458cc2008-10-22 10:00:13 -0500251}
252
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253/* Provided by the linker */
254extern const struct kernel_symbol __start___ksymtab[];
255extern const struct kernel_symbol __stop___ksymtab[];
256extern const struct kernel_symbol __start___ksymtab_gpl[];
257extern const struct kernel_symbol __stop___ksymtab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800258extern const struct kernel_symbol __start___ksymtab_gpl_future[];
259extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260extern const unsigned long __start___kcrctab[];
261extern const unsigned long __start___kcrctab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800262extern const unsigned long __start___kcrctab_gpl_future[];
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500263#ifdef CONFIG_UNUSED_SYMBOLS
264extern const struct kernel_symbol __start___ksymtab_unused[];
265extern const struct kernel_symbol __stop___ksymtab_unused[];
266extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
267extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700268extern const unsigned long __start___kcrctab_unused[];
269extern const unsigned long __start___kcrctab_unused_gpl[];
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500270#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272#ifndef CONFIG_MODVERSIONS
273#define symversion(base, idx) NULL
274#else
Andrew Mortonf83ca9f2006-03-28 01:56:20 -0800275#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276#endif
277
Rusty Russelldafd0942008-07-22 19:24:25 -0500278static 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 Russellde4d8d52011-04-19 21:49:58 +0200283 void *data),
Rusty Russelldafd0942008-07-22 19:24:25 -0500284 void *data)
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100285{
Rusty Russellde4d8d52011-04-19 21:49:58 +0200286 unsigned int j;
Rusty Russelldafd0942008-07-22 19:24:25 -0500287
288 for (j = 0; j < arrsize; j++) {
Rusty Russellde4d8d52011-04-19 21:49:58 +0200289 if (fn(&arr[j], owner, data))
290 return true;
Rusty Russelldafd0942008-07-22 19:24:25 -0500291 }
292
293 return false;
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100294}
295
Rusty Russelldafd0942008-07-22 19:24:25 -0500296/* Returns true as soon as fn returns true, otherwise false. */
Rusty Russellde4d8d52011-04-19 21:49:58 +0200297bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
298 struct module *owner,
299 void *data),
300 void *data)
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700301{
Rusty Russelldafd0942008-07-22 19:24:25 -0500302 struct module *mod;
Linus Torvalds44032e62010-08-05 12:59:05 -0600303 static const struct symsearch arr[] = {
Rusty Russelldafd0942008-07-22 19:24:25 -0500304 { __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 Vlasenkof7f5b672008-07-22 19:24:26 -0500312#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500313 { __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 Vlasenkof7f5b672008-07-22 19:24:26 -0500319#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500320 };
321
322 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
323 return true;
324
Andi Kleend72b3752008-08-30 10:09:00 +0200325 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russelldafd0942008-07-22 19:24:25 -0500326 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 Vlasenkof7f5b672008-07-22 19:24:26 -0500336#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500337 { 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 Vlasenkof7f5b672008-07-22 19:24:26 -0500345#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500346 };
347
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030348 if (mod->state == MODULE_STATE_UNFORMED)
349 continue;
350
Rusty Russelldafd0942008-07-22 19:24:25 -0500351 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
352 return true;
353 }
354 return false;
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700355}
Rusty Russellde4d8d52011-04-19 21:49:58 +0200356EXPORT_SYMBOL_GPL(each_symbol_section);
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700357
Rusty Russelldafd0942008-07-22 19:24:25 -0500358struct 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 Abbott414fd312008-12-05 19:03:56 -0500367 const struct kernel_symbol *sym;
Rusty Russelldafd0942008-07-22 19:24:25 -0500368};
369
Rusty Russellde4d8d52011-04-19 21:49:58 +0200370static bool check_symbol(const struct symsearch *syms,
371 struct module *owner,
372 unsigned int symnum, void *data)
Rusty Russellad9546c2008-05-01 21:14:59 -0500373{
Rusty Russelldafd0942008-07-22 19:24:25 -0500374 struct find_symbol_arg *fsa = data;
375
Rusty Russelldafd0942008-07-22 19:24:25 -0500376 if (!fsa->gplok) {
377 if (syms->licence == GPL_ONLY)
378 return false;
379 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -0800380 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 Russelldafd0942008-07-22 19:24:25 -0500383 }
384 }
385
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500386#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500387 if (syms->unused && fsa->warn) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -0800388 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 Russellad9546c2008-05-01 21:14:59 -0500395 }
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500396#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500397
398 fsa->owner = owner;
399 fsa->crc = symversion(syms->crcs, symnum);
Tim Abbott414fd312008-12-05 19:03:56 -0500400 fsa->sym = &syms->start[symnum];
Rusty Russellad9546c2008-05-01 21:14:59 -0500401 return true;
402}
403
Alessio Igor Bogani403ed272011-04-20 11:10:52 +0200404static 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 Russellde4d8d52011-04-19 21:49:58 +0200412static 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 Bogani403ed272011-04-20 11:10:52 +0200417 struct kernel_symbol *sym;
Rusty Russellde4d8d52011-04-19 21:49:58 +0200418
Alessio Igor Bogani403ed272011-04-20 11:10:52 +0200419 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 Russellde4d8d52011-04-19 21:49:58 +0200425 return false;
426}
427
Tim Abbott414fd312008-12-05 19:03:56 -0500428/* Find a symbol and return it, along with, (optional) crc and
Rusty Russell75676502010-06-05 11:17:36 -0600429 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
Tim Abbottc6b37802008-12-05 19:03:59 -0500430const struct kernel_symbol *find_symbol(const char *name,
431 struct module **owner,
432 const unsigned long **crc,
433 bool gplok,
434 bool warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435{
Rusty Russelldafd0942008-07-22 19:24:25 -0500436 struct find_symbol_arg fsa;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
Rusty Russelldafd0942008-07-22 19:24:25 -0500438 fsa.name = name;
439 fsa.gplok = gplok;
440 fsa.warn = warn;
441
Rusty Russellde4d8d52011-04-19 21:49:58 +0200442 if (each_symbol_section(find_symbol_in_section, &fsa)) {
Rusty Russellad9546c2008-05-01 21:14:59 -0500443 if (owner)
Rusty Russelldafd0942008-07-22 19:24:25 -0500444 *owner = fsa.owner;
445 if (crc)
446 *crc = fsa.crc;
Tim Abbott414fd312008-12-05 19:03:56 -0500447 return fsa.sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 }
Rusty Russellad9546c2008-05-01 21:14:59 -0500449
Jim Cromie5e124162011-12-06 12:11:31 -0700450 pr_debug("Failed to find symbol %s\n", name);
Tim Abbott414fd312008-12-05 19:03:56 -0500451 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452}
Tim Abbottc6b37802008-12-05 19:03:59 -0500453EXPORT_SYMBOL_GPL(find_symbol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455/* Search for module by name: must hold module_mutex. */
Mathias Krause4f6de4d2013-07-02 15:35:11 +0930456static struct module *find_module_all(const char *name, size_t len,
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030457 bool even_unformed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458{
459 struct module *mod;
460
461 list_for_each_entry(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030462 if (!even_unformed && mod->state == MODULE_STATE_UNFORMED)
463 continue;
Mathias Krause4f6de4d2013-07-02 15:35:11 +0930464 if (strlen(mod->name) == len && !memcmp(mod->name, name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 return mod;
466 }
467 return NULL;
468}
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030469
470struct module *find_module(const char *name)
471{
Mathias Krause4f6de4d2013-07-02 15:35:11 +0930472 return find_module_all(name, strlen(name), false);
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030473}
Tim Abbottc6b37802008-12-05 19:03:59 -0500474EXPORT_SYMBOL_GPL(find_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476#ifdef CONFIG_SMP
Tejun Heofbf59bc2009-02-20 16:29:08 +0900477
Tejun Heo259354d2010-03-10 18:56:10 +0900478static inline void __percpu *mod_percpu(struct module *mod)
Tejun Heofbf59bc2009-02-20 16:29:08 +0900479{
Tejun Heo259354d2010-03-10 18:56:10 +0900480 return mod->percpu;
481}
Tejun Heofbf59bc2009-02-20 16:29:08 +0900482
Rusty Russell9eb76d72013-07-03 10:06:29 +0930483static int percpu_modalloc(struct module *mod, struct load_info *info)
Tejun Heo259354d2010-03-10 18:56:10 +0900484{
Rusty Russell9eb76d72013-07-03 10:06:29 +0930485 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 Heofbf59bc2009-02-20 16:29:08 +0900491 if (align > PAGE_SIZE) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -0800492 pr_warn("%s: per-cpu alignment %li > %li\n",
493 mod->name, align, PAGE_SIZE);
Tejun Heofbf59bc2009-02-20 16:29:08 +0900494 align = PAGE_SIZE;
495 }
496
Rusty Russell9eb76d72013-07-03 10:06:29 +0930497 mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align);
Tejun Heo259354d2010-03-10 18:56:10 +0900498 if (!mod->percpu) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -0800499 pr_warn("%s: Could not allocate %lu bytes percpu data\n",
500 mod->name, (unsigned long)pcpusec->sh_size);
Tejun Heo259354d2010-03-10 18:56:10 +0900501 return -ENOMEM;
502 }
Rusty Russell9eb76d72013-07-03 10:06:29 +0930503 mod->percpu_size = pcpusec->sh_size;
Tejun Heo259354d2010-03-10 18:56:10 +0900504 return 0;
Tejun Heofbf59bc2009-02-20 16:29:08 +0900505}
506
Tejun Heo259354d2010-03-10 18:56:10 +0900507static void percpu_modfree(struct module *mod)
Tejun Heofbf59bc2009-02-20 16:29:08 +0900508{
Tejun Heo259354d2010-03-10 18:56:10 +0900509 free_percpu(mod->percpu);
Tejun Heofbf59bc2009-02-20 16:29:08 +0900510}
511
Rusty Russell49668682010-08-05 12:59:10 -0600512static unsigned int find_pcpusec(struct load_info *info)
Tejun Heo6b588c12009-02-20 16:29:07 +0900513{
Rusty Russell49668682010-08-05 12:59:10 -0600514 return find_sec(info, ".data..percpu");
Tejun Heo6b588c12009-02-20 16:29:07 +0900515}
516
Tejun Heo259354d2010-03-10 18:56:10 +0900517static void percpu_modcopy(struct module *mod,
518 const void *from, unsigned long size)
Tejun Heo6b588c12009-02-20 16:29:07 +0900519{
520 int cpu;
521
522 for_each_possible_cpu(cpu)
Tejun Heo259354d2010-03-10 18:56:10 +0900523 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
Tejun Heo6b588c12009-02-20 16:29:07 +0900524}
525
Tejun Heo10fad5e2010-03-10 18:57:54 +0900526/**
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 */
535bool 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 Russell0d21b0e2013-01-12 11:38:44 +1030543 if (mod->state == MODULE_STATE_UNFORMED)
544 continue;
Tejun Heo10fad5e2010-03-10 18:57:54 +0900545 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 Walker22a8bde2007-10-18 03:06:07 -0700560}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
562#else /* ... !CONFIG_SMP */
Tejun Heo6b588c12009-02-20 16:29:07 +0900563
Tejun Heo259354d2010-03-10 18:56:10 +0900564static inline void __percpu *mod_percpu(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565{
566 return NULL;
567}
Rusty Russell9eb76d72013-07-03 10:06:29 +0930568static int percpu_modalloc(struct module *mod, struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569{
Rusty Russell9eb76d72013-07-03 10:06:29 +0930570 /* 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 Heo259354d2010-03-10 18:56:10 +0900574}
575static inline void percpu_modfree(struct module *mod)
576{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577}
Rusty Russell49668682010-08-05 12:59:10 -0600578static unsigned int find_pcpusec(struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579{
580 return 0;
581}
Tejun Heo259354d2010-03-10 18:56:10 +0900582static inline void percpu_modcopy(struct module *mod,
583 const void *from, unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584{
585 /* pcpusec should be 0, and size of that section should be 0. */
586 BUG_ON(size != 0);
587}
Tejun Heo10fad5e2010-03-10 18:57:54 +0900588bool is_module_percpu_address(unsigned long addr)
589{
590 return false;
591}
Tejun Heo6b588c12009-02-20 16:29:07 +0900592
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593#endif /* CONFIG_SMP */
594
Matt Domschc988d2b2005-06-23 22:05:15 -0700595#define MODINFO_ATTR(field) \
596static void setup_modinfo_##field(struct module *mod, const char *s) \
597{ \
598 mod->field = kstrdup(s, GFP_KERNEL); \
599} \
600static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
Kay Sievers4befb022011-07-24 22:06:04 +0930601 struct module_kobject *mk, char *buffer) \
Matt Domschc988d2b2005-06-23 22:05:15 -0700602{ \
Chen Gangcc56ded2013-08-20 15:34:21 +0930603 return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
Matt Domschc988d2b2005-06-23 22:05:15 -0700604} \
605static int modinfo_##field##_exists(struct module *mod) \
606{ \
607 return mod->field != NULL; \
608} \
609static void free_modinfo_##field(struct module *mod) \
610{ \
Daniel Walker22a8bde2007-10-18 03:06:07 -0700611 kfree(mod->field); \
612 mod->field = NULL; \
Matt Domschc988d2b2005-06-23 22:05:15 -0700613} \
614static struct module_attribute modinfo_##field = { \
Tejun Heo7b595752007-06-14 03:45:17 +0900615 .attr = { .name = __stringify(field), .mode = 0444 }, \
Matt Domschc988d2b2005-06-23 22:05:15 -0700616 .show = show_modinfo_##field, \
617 .setup = setup_modinfo_##field, \
618 .test = modinfo_##field##_exists, \
619 .free = free_modinfo_##field, \
620};
621
622MODINFO_ATTR(version);
623MODINFO_ATTR(srcversion);
624
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100625static char last_unloaded_module[MODULE_NAME_LEN+1];
626
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800627#ifdef CONFIG_MODULE_UNLOAD
Steven Rostedteb0c5372010-03-29 14:25:18 -0400628
629EXPORT_TRACEPOINT_SYMBOL(module_get);
630
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631/* Init the unload section of the module. */
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600632static int module_unload_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633{
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600634 mod->refptr = alloc_percpu(struct module_ref);
635 if (!mod->refptr)
636 return -ENOMEM;
637
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700638 INIT_LIST_HEAD(&mod->source_list);
639 INIT_LIST_HEAD(&mod->target_list);
Christoph Lametere1783a22010-01-05 15:34:50 +0900640
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 /* Hold reference count during initialization. */
Christoph Lameter08f141d2014-04-07 15:39:39 -0700642 raw_cpu_write(mod->refptr->incs, 1);
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600643
644 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645}
646
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647/* Does a already use b? */
648static int already_uses(struct module *a, struct module *b)
649{
650 struct module_use *use;
651
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700652 list_for_each_entry(use, &b->source_list, source_list) {
653 if (use->source == a) {
Jim Cromie5e124162011-12-06 12:11:31 -0700654 pr_debug("%s uses %s!\n", a->name, b->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 return 1;
656 }
657 }
Jim Cromie5e124162011-12-06 12:11:31 -0700658 pr_debug("%s does not use %s!\n", a->name, b->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 return 0;
660}
661
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700662/*
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 */
669static int add_module_usage(struct module *a, struct module *b)
670{
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700671 struct module_use *use;
672
Jim Cromie5e124162011-12-06 12:11:31 -0700673 pr_debug("Allocating new usage for %s.\n", a->name);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700674 use = kmalloc(sizeof(*use), GFP_ATOMIC);
675 if (!use) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -0800676 pr_warn("%s: out of memory loading\n", a->name);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700677 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 Torvalds2c02dfe2010-05-31 12:19:37 -0700684 return 0;
685}
686
Rusty Russell75676502010-06-05 11:17:36 -0600687/* Module a uses b: caller needs module_mutex() */
Rusty Russell9bea7f22010-06-05 11:17:37 -0600688int ref_module(struct module *a, struct module *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689{
Rusty Russellc8e21ce2010-06-05 11:17:35 -0600690 int err;
Kay Sievers270a6c42007-01-18 13:26:15 +0100691
Rusty Russell9bea7f22010-06-05 11:17:37 -0600692 if (b == NULL || already_uses(a, b))
Linus Torvalds218ce732010-05-25 16:48:30 -0700693 return 0;
Linus Torvalds218ce732010-05-25 16:48:30 -0700694
Rusty Russell9bea7f22010-06-05 11:17:37 -0600695 /* If module isn't available, we fail. */
696 err = strong_try_module_get(b);
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500697 if (err)
Rusty Russell9bea7f22010-06-05 11:17:37 -0600698 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700700 err = add_module_usage(a, b);
701 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 module_put(b);
Rusty Russell9bea7f22010-06-05 11:17:37 -0600703 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 }
Rusty Russell9bea7f22010-06-05 11:17:37 -0600705 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706}
Rusty Russell9bea7f22010-06-05 11:17:37 -0600707EXPORT_SYMBOL_GPL(ref_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
709/* Clear the unload stuff of the module. */
710static void module_unload_free(struct module *mod)
711{
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700712 struct module_use *use, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
Rusty Russell75676502010-06-05 11:17:36 -0600714 mutex_lock(&module_mutex);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700715 list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
716 struct module *i = use->target;
Jim Cromie5e124162011-12-06 12:11:31 -0700717 pr_debug("%s unusing %s\n", mod->name, i->name);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700718 module_put(i);
719 list_del(&use->source_list);
720 list_del(&use->target_list);
721 kfree(use);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 }
Rusty Russell75676502010-06-05 11:17:36 -0600723 mutex_unlock(&module_mutex);
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600724
725 free_percpu(mod->refptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726}
727
728#ifdef CONFIG_MODULE_FORCE_UNLOAD
Akinobu Mitafb169792006-01-08 01:04:29 -0800729static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730{
731 int ret = (flags & O_TRUNC);
732 if (ret)
Rusty Russell373d4d02013-01-21 17:17:39 +1030733 add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 return ret;
735}
736#else
Akinobu Mitafb169792006-01-08 01:04:29 -0800737static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738{
739 return 0;
740}
741#endif /* CONFIG_MODULE_FORCE_UNLOAD */
742
743struct 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. */
751static int __try_stop_module(void *_sref)
752{
753 struct stopref *sref = _sref;
754
Rusty Russellda39ba52008-07-22 19:24:25 -0500755 /* If it's not unused, quit unless we're forcing. */
756 if (module_refcount(sref->mod) != 0) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800757 if (!(*sref->forced = try_force_unload(sref->flags)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 return -EWOULDBLOCK;
759 }
760
761 /* Mark it as dying. */
762 sref->mod->state = MODULE_STATE_GOING;
763 return 0;
764}
765
766static int try_stop_module(struct module *mod, int flags, int *forced)
767{
Rusty Russell3f2b9c92013-09-17 05:48:51 +0930768 struct stopref sref = { mod, flags, forced };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Rusty Russell3f2b9c92013-09-17 05:48:51 +0930770 return stop_machine(__try_stop_module, &sref, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771}
772
Eric Dumazetbd77c042012-01-13 09:32:14 +1030773unsigned long module_refcount(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774{
Eric Dumazetbd77c042012-01-13 09:32:14 +1030775 unsigned long incs = 0, decs = 0;
Eric Dumazet720eba32009-02-03 13:31:36 +1030776 int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Eric Dumazet720eba32009-02-03 13:31:36 +1030778 for_each_possible_cpu(cpu)
Nick Piggin5fbfb182010-04-01 19:09:40 +1100779 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 Torvalds1da177e2005-04-16 15:20:36 -0700797}
798EXPORT_SYMBOL(module_refcount);
799
800/* This exists whether we can unload or not */
801static void free_module(struct module *mod);
802
Heiko Carstens17da2bd2009-01-14 14:14:10 +0100803SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
804 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805{
806 struct module *mod;
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800807 char name[MODULE_NAME_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 int ret, forced = 0;
809
Kees Cook3d433212009-04-02 15:49:29 -0700810 if (!capable(CAP_SYS_MODULE) || modules_disabled)
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800811 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 Heo3fc1f1e2010-05-06 18:49:20 +0200817 if (mutex_lock_interruptible(&module_mutex) != 0)
818 return -EINTR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
820 mod = find_module(name);
821 if (!mod) {
822 ret = -ENOENT;
823 goto out;
824 }
825
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700826 if (!list_empty(&mod->source_list)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 /* 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 Russell3f2b9c92013-09-17 05:48:51 +0930834 /* FIXME: if (force), slam module count damn the torpedoes */
Jim Cromie5e124162011-12-06 12:11:31 -0700835 pr_debug("%s already dying\n", mod->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 ret = -EBUSY;
837 goto out;
838 }
839
840 /* If it has an init func, it must have an exit func to unload */
Rusty Russellaf49d922007-10-16 23:26:27 -0700841 if (mod->init && !mod->exit) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800842 forced = try_force_unload(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 if (!forced) {
844 /* This module can't be removed */
845 ret = -EBUSY;
846 goto out;
847 }
848 }
849
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 /* 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 Oberparleiterdf4b5652008-04-21 14:34:31 +0200855 mutex_unlock(&module_mutex);
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300856 /* Final destruction now no one is using it. */
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200857 if (mod->exit != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 mod->exit();
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200859 blocking_notifier_call_chain(&module_notify_list,
860 MODULE_STATE_GOING, mod);
Arjan van de Ven22a9d642009-01-07 08:45:46 -0800861 async_synchronize_full();
Rusty Russell75676502010-06-05 11:17:36 -0600862
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100863 /* Store the name of the last unloaded module for diagnostic purposes */
Rusty Russellefa53452008-01-29 17:13:20 -0500864 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865
Rusty Russell75676502010-06-05 11:17:36 -0600866 free_module(mod);
867 return 0;
868out:
Ashutosh Naik6389a382006-03-23 03:00:46 -0800869 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 return ret;
871}
872
Jianjun Kongd1e99d72008-12-08 14:26:29 +0800873static inline void print_unload_info(struct seq_file *m, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874{
875 struct module_use *use;
876 int printed_something = 0;
877
Eric Dumazetbd77c042012-01-13 09:32:14 +1030878 seq_printf(m, " %lu ", module_refcount(mod));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
880 /* Always include a trailing , so userspace can differentiate
881 between this and the old multi-field proc format. */
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700882 list_for_each_entry(use, &mod->source_list, source_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 printed_something = 1;
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700884 seq_printf(m, "%s,", use->source->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 }
886
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 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
896void __symbol_put(const char *symbol)
897{
898 struct module *owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
Rusty Russell24da1cb2007-07-15 23:41:46 -0700900 preempt_disable();
Tim Abbott414fd312008-12-05 19:03:56 -0500901 if (!find_symbol(symbol, &owner, NULL, true, false))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 BUG();
903 module_put(owner);
Rusty Russell24da1cb2007-07-15 23:41:46 -0700904 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
906EXPORT_SYMBOL(__symbol_put);
907
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930908/* Note this assumes addr is a function, which it currently always is. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909void symbol_put_addr(void *addr)
910{
Trent Piepho5e376612006-05-15 09:44:06 -0700911 struct module *modaddr;
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930912 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930914 if (core_kernel_text(a))
Trent Piepho5e376612006-05-15 09:44:06 -0700915 return;
916
Rusty Russella6e6abd2009-03-31 13:05:31 -0600917 /* 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 Russell7d1d16e2009-08-26 22:02:54 +0930919 modaddr = __module_text_address(a);
Rusty Russella6e6abd2009-03-31 13:05:31 -0600920 BUG_ON(!modaddr);
Trent Piepho5e376612006-05-15 09:44:06 -0700921 module_put(modaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922}
923EXPORT_SYMBOL_GPL(symbol_put_addr);
924
925static ssize_t show_refcnt(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +0930926 struct module_kobject *mk, char *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927{
Eric Dumazetbd77c042012-01-13 09:32:14 +1030928 return sprintf(buffer, "%lu\n", module_refcount(mk->mod));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929}
930
Kay Sieverscca3e702012-01-13 09:32:15 +1030931static struct module_attribute modinfo_refcnt =
932 __ATTR(refcnt, 0444, show_refcnt, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
Steven Rostedtd53799b2012-03-26 12:50:52 +1030934void __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}
943EXPORT_SYMBOL(__module_get);
944
945bool 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}
962EXPORT_SYMBOL(try_module_get);
963
Al Virof6a57032006-10-18 01:47:25 -0400964void module_put(struct module *module)
965{
966 if (module) {
Christoph Lametere1783a22010-01-05 15:34:50 +0900967 preempt_disable();
Nick Piggin5fbfb182010-04-01 19:09:40 +1100968 smp_wmb(); /* see comment in module_refcount */
969 __this_cpu_inc(module->refptr->decs);
Christoph Lametere1783a22010-01-05 15:34:50 +0900970
Li Zefanae832d12010-03-24 10:57:43 +0800971 trace_module_put(module, _RET_IP_);
Christoph Lametere1783a22010-01-05 15:34:50 +0900972 preempt_enable();
Al Virof6a57032006-10-18 01:47:25 -0400973 }
974}
975EXPORT_SYMBOL(module_put);
976
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977#else /* !CONFIG_MODULE_UNLOAD */
Jianjun Kongd1e99d72008-12-08 14:26:29 +0800978static inline void print_unload_info(struct seq_file *m, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979{
980 /* We don't know the usage count, or what modules are using. */
981 seq_printf(m, " - -");
982}
983
984static inline void module_unload_free(struct module *mod)
985{
986}
987
Rusty Russell9bea7f22010-06-05 11:17:37 -0600988int ref_module(struct module *a, struct module *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989{
Rusty Russell9bea7f22010-06-05 11:17:37 -0600990 return strong_try_module_get(b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991}
Rusty Russell9bea7f22010-06-05 11:17:37 -0600992EXPORT_SYMBOL_GPL(ref_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600994static inline int module_unload_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995{
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600996 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997}
998#endif /* CONFIG_MODULE_UNLOAD */
999
Kevin Winchester53999bf2012-01-15 19:32:55 -04001000static 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 Desnoyers66cc69e2014-03-13 12:11:30 +10301012 if (mod->taints & (1 << TAINT_UNSIGNED_MODULE))
Rusty Russell57673c22014-03-31 14:39:57 +10301013 buf[l++] = 'E';
Kevin Winchester53999bf2012-01-15 19:32:55 -04001014 /*
1015 * TAINT_FORCED_RMMOD: could be added.
Dave Jones8c904872014-02-26 10:49:49 -05001016 * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
Kevin Winchester53999bf2012-01-15 19:32:55 -04001017 * apply to modules.
1018 */
1019 return l;
1020}
1021
Kay Sievers1f717402006-11-24 12:15:25 +01001022static ssize_t show_initstate(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +09301023 struct module_kobject *mk, char *buffer)
Kay Sievers1f717402006-11-24 12:15:25 +01001024{
1025 const char *state = "unknown";
1026
Kay Sievers4befb022011-07-24 22:06:04 +09301027 switch (mk->mod->state) {
Kay Sievers1f717402006-11-24 12:15:25 +01001028 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 Russell0d21b0e2013-01-12 11:38:44 +10301037 default:
1038 BUG();
Kay Sievers1f717402006-11-24 12:15:25 +01001039 }
1040 return sprintf(buffer, "%s\n", state);
1041}
1042
Kay Sieverscca3e702012-01-13 09:32:15 +10301043static struct module_attribute modinfo_initstate =
1044 __ATTR(initstate, 0444, show_initstate, NULL);
Kay Sievers1f717402006-11-24 12:15:25 +01001045
Kay Sievers88bfa322011-07-24 22:06:04 +09301046static 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 Sieverscca3e702012-01-13 09:32:15 +10301057struct module_attribute module_uevent =
1058 __ATTR(uevent, 0200, NULL, store_uevent);
1059
1060static 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
1066static struct module_attribute modinfo_coresize =
1067 __ATTR(coresize, 0444, show_coresize, NULL);
1068
1069static 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
1075static struct module_attribute modinfo_initsize =
1076 __ATTR(initsize, 0444, show_initsize, NULL);
1077
1078static 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
1088static struct module_attribute modinfo_taint =
1089 __ATTR(taint, 0444, show_taint, NULL);
Kay Sievers88bfa322011-07-24 22:06:04 +09301090
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001091static struct module_attribute *modinfo_attrs[] = {
Kay Sieverscca3e702012-01-13 09:32:15 +10301092 &module_uevent,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001093 &modinfo_version,
1094 &modinfo_srcversion,
Kay Sieverscca3e702012-01-13 09:32:15 +10301095 &modinfo_initstate,
1096 &modinfo_coresize,
1097 &modinfo_initsize,
1098 &modinfo_taint,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001099#ifdef CONFIG_MODULE_UNLOAD
Kay Sieverscca3e702012-01-13 09:32:15 +10301100 &modinfo_refcnt,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001101#endif
1102 NULL,
1103};
1104
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105static const char vermagic[] = VERMAGIC_STRING;
1106
Rusty Russellc6e665c2009-03-31 13:05:33 -06001107static int try_to_force_load(struct module *mod, const char *reason)
Linus Torvalds826e4502008-05-04 17:04:16 -07001108{
1109#ifdef CONFIG_MODULE_FORCE_LOAD
Andi Kleen25ddbb12008-10-15 22:01:41 -07001110 if (!test_taint(TAINT_FORCED_MODULE))
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001111 pr_warn("%s: %s: kernel tainted.\n", mod->name, reason);
Rusty Russell373d4d02013-01-21 17:17:39 +10301112 add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE);
Linus Torvalds826e4502008-05-04 17:04:16 -07001113 return 0;
1114#else
1115 return -ENOEXEC;
1116#endif
1117}
1118
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119#ifdef CONFIG_MODVERSIONS
Rusty Russelld4703ae2009-12-15 16:28:32 -06001120/* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1121static 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 Torvalds1da177e2005-04-16 15:20:36 -07001131static int check_version(Elf_Shdr *sechdrs,
1132 unsigned int versindex,
1133 const char *symname,
1134 struct module *mod,
Rusty Russelld4703ae2009-12-15 16:28:32 -06001135 const unsigned long *crc,
1136 const struct module *crc_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137{
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 Russella5dd6972008-05-09 16:24:21 +10001145 /* No versions at all? modprobe --force does this. */
1146 if (versindex == 0)
1147 return try_to_force_load(mod, symname) == 0;
1148
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 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 Russelld4703ae2009-12-15 16:28:32 -06001157 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 return 1;
Jim Cromie5e124162011-12-06 12:11:31 -07001159 pr_debug("Found checksum %lX vs module %lX\n",
Rusty Russelld4703ae2009-12-15 16:28:32 -06001160 maybe_relocated(*crc, crc_owner), versions[i].crc);
Linus Torvalds826e4502008-05-04 17:04:16 -07001161 goto bad_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 }
Linus Torvalds826e4502008-05-04 17:04:16 -07001163
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001164 pr_warn("%s: no symbol version for %s\n", mod->name, symname);
Rusty Russella5dd6972008-05-09 16:24:21 +10001165 return 0;
Linus Torvalds826e4502008-05-04 17:04:16 -07001166
1167bad_version:
1168 printk("%s: disagrees about version of symbol %s\n",
1169 mod->name, symname);
1170 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171}
1172
1173static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1174 unsigned int versindex,
1175 struct module *mod)
1176{
1177 const unsigned long *crc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178
Rusty Russell75676502010-06-05 11:17:36 -06001179 /* Since this should be found in kernel (which can't be removed),
1180 * no locking is necessary. */
Rusty Russellb92021b2013-03-15 15:04:17 +10301181 if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL,
Mike Frysinger6560dc12009-07-23 23:42:08 +09301182 &crc, true, false))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 BUG();
James Hogana4b6a772013-03-18 19:38:56 +10301184 return check_version(sechdrs, versindex,
1185 VMLINUX_SYMBOL_STR(module_layout), mod, crc,
Rusty Russelld4703ae2009-12-15 16:28:32 -06001186 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187}
1188
Rusty Russell91e37a72008-05-09 16:25:28 +10001189/* First part is kernel version, which we ignore if module has crcs. */
1190static inline int same_magic(const char *amagic, const char *bmagic,
1191 bool has_crcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192{
Rusty Russell91e37a72008-05-09 16:25:28 +10001193 if (has_crcs) {
1194 amagic += strcspn(amagic, " ");
1195 bmagic += strcspn(bmagic, " ");
1196 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 return strcmp(amagic, bmagic) == 0;
1198}
1199#else
1200static inline int check_version(Elf_Shdr *sechdrs,
1201 unsigned int versindex,
1202 const char *symname,
1203 struct module *mod,
Rusty Russelld4703ae2009-12-15 16:28:32 -06001204 const unsigned long *crc,
1205 const struct module *crc_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206{
1207 return 1;
1208}
1209
1210static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1211 unsigned int versindex,
1212 struct module *mod)
1213{
1214 return 1;
1215}
1216
Rusty Russell91e37a72008-05-09 16:25:28 +10001217static inline int same_magic(const char *amagic, const char *bmagic,
1218 bool has_crcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219{
1220 return strcmp(amagic, bmagic) == 0;
1221}
1222#endif /* CONFIG_MODVERSIONS */
1223
Rusty Russell75676502010-06-05 11:17:36 -06001224/* Resolve a symbol for this module. I.e. if we find one, record usage. */
Rusty Russell49668682010-08-05 12:59:10 -06001225static const struct kernel_symbol *resolve_symbol(struct module *mod,
1226 const struct load_info *info,
Tim Abbott414fd312008-12-05 19:03:56 -05001227 const char *name,
Rusty Russell9bea7f22010-06-05 11:17:37 -06001228 char ownername[])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229{
1230 struct module *owner;
Tim Abbott414fd312008-12-05 19:03:56 -05001231 const struct kernel_symbol *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 const unsigned long *crc;
Rusty Russell9bea7f22010-06-05 11:17:37 -06001233 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234
Rusty Russell75676502010-06-05 11:17:36 -06001235 mutex_lock(&module_mutex);
Tim Abbott414fd312008-12-05 19:03:56 -05001236 sym = find_symbol(name, &owner, &crc,
Andi Kleen25ddbb12008-10-15 22:01:41 -07001237 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
Rusty Russell9bea7f22010-06-05 11:17:37 -06001238 if (!sym)
1239 goto unlock;
1240
Rusty Russell49668682010-08-05 12:59:10 -06001241 if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
1242 owner)) {
Rusty Russell9bea7f22010-06-05 11:17:37 -06001243 sym = ERR_PTR(-EINVAL);
1244 goto getname;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 }
Rusty Russell9bea7f22010-06-05 11:17:37 -06001246
1247 err = ref_module(mod, owner);
1248 if (err) {
1249 sym = ERR_PTR(err);
1250 goto getname;
1251 }
1252
1253getname:
1254 /* We must make copy under the lock if we failed to get ref. */
1255 strncpy(ownername, module_name(owner), MODULE_NAME_LEN);
1256unlock:
Rusty Russell75676502010-06-05 11:17:36 -06001257 mutex_unlock(&module_mutex);
Linus Torvalds218ce732010-05-25 16:48:30 -07001258 return sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259}
1260
Rusty Russell49668682010-08-05 12:59:10 -06001261static const struct kernel_symbol *
1262resolve_symbol_wait(struct module *mod,
1263 const struct load_info *info,
1264 const char *name)
Rusty Russell9bea7f22010-06-05 11:17:37 -06001265{
1266 const struct kernel_symbol *ksym;
Rusty Russell49668682010-08-05 12:59:10 -06001267 char owner[MODULE_NAME_LEN];
Rusty Russell9bea7f22010-06-05 11:17:37 -06001268
1269 if (wait_event_interruptible_timeout(module_wq,
Rusty Russell49668682010-08-05 12:59:10 -06001270 !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
1271 || PTR_ERR(ksym) != -EBUSY,
Rusty Russell9bea7f22010-06-05 11:17:37 -06001272 30 * HZ) <= 0) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001273 pr_warn("%s: gave up waiting for init of module %s.\n",
1274 mod->name, owner);
Rusty Russell9bea7f22010-06-05 11:17:37 -06001275 }
1276 return ksym;
1277}
1278
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279/*
1280 * /sys/module/foo/sections stuff
1281 * J. Corbet <corbet@lwn.net>
1282 */
Rusty Russell8f6d0372010-08-05 12:59:09 -06001283#ifdef CONFIG_SYSFS
Ben Hutchings10b465a2009-12-19 14:43:01 +00001284
Rusty Russell8f6d0372010-08-05 12:59:09 -06001285#ifdef CONFIG_KALLSYMS
Ben Hutchings10b465a2009-12-19 14:43:01 +00001286static inline bool sect_empty(const Elf_Shdr *sect)
1287{
1288 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1289}
1290
Rusty Russella58730c2008-03-13 09:03:44 +00001291struct module_sect_attr
1292{
1293 struct module_attribute mattr;
1294 char *name;
1295 unsigned long address;
1296};
1297
1298struct module_sect_attrs
1299{
1300 struct attribute_group grp;
1301 unsigned int nsections;
1302 struct module_sect_attr attrs[0];
1303};
1304
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305static ssize_t module_sect_show(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +09301306 struct module_kobject *mk, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307{
1308 struct module_sect_attr *sattr =
1309 container_of(mattr, struct module_sect_attr, mattr);
Kees Cook9f36e2c2011-03-22 16:34:22 -07001310 return sprintf(buf, "0x%pK\n", (void *)sattr->address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311}
1312
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001313static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1314{
Rusty Russella58730c2008-03-13 09:03:44 +00001315 unsigned int section;
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001316
1317 for (section = 0; section < sect_attrs->nsections; section++)
1318 kfree(sect_attrs->attrs[section].name);
1319 kfree(sect_attrs);
1320}
1321
Rusty Russell8f6d0372010-08-05 12:59:09 -06001322static void add_sect_attrs(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323{
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 Walker22a8bde2007-10-18 03:06:07 -07001328
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 /* Count loaded sections and allocate structures */
Rusty Russell8f6d0372010-08-05 12:59:09 -06001330 for (i = 0; i < info->hdr->e_shnum; i++)
1331 if (!sect_empty(&info->sechdrs[i]))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 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. Nelson04b1db92006-09-29 02:01:31 -07001337 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1338 if (sect_attrs == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 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. Nelson04b1db92006-09-29 02:01:31 -07001345 sect_attrs->nsections = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 sattr = &sect_attrs->attrs[0];
1347 gattr = &sect_attrs->grp.attrs[0];
Rusty Russell8f6d0372010-08-05 12:59:09 -06001348 for (i = 0; i < info->hdr->e_shnum; i++) {
1349 Elf_Shdr *sec = &info->sechdrs[i];
1350 if (sect_empty(sec))
Helge Deller35dead42009-12-03 00:29:15 +01001351 continue;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001352 sattr->address = sec->sh_addr;
1353 sattr->name = kstrdup(info->secstrings + sec->sh_name,
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001354 GFP_KERNEL);
1355 if (sattr->name == NULL)
1356 goto out;
1357 sect_attrs->nsections++;
Eric W. Biederman361795b2010-02-12 13:41:56 -08001358 sysfs_attr_init(&sattr->mattr.attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 sattr->mattr.show = module_sect_show;
1360 sattr->mattr.store = NULL;
1361 sattr->mattr.attr.name = sattr->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 sattr->mattr.attr.mode = S_IRUGO;
1363 *(gattr++) = &(sattr++)->mattr.attr;
1364 }
1365 *gattr = NULL;
1366
1367 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
1368 goto out;
1369
1370 mod->sect_attrs = sect_attrs;
1371 return;
1372 out:
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001373 free_sect_attrs(sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374}
1375
1376static 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. Nelson04b1db92006-09-29 02:01:31 -07001383 free_sect_attrs(mod->sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 mod->sect_attrs = NULL;
1385 }
1386}
1387
Roland McGrath6d760132007-10-16 23:26:40 -07001388/*
1389 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1390 */
1391
1392struct module_notes_attrs {
1393 struct kobject *dir;
1394 unsigned int notes;
1395 struct bin_attribute attrs[0];
1396};
1397
Chris Wright2c3c8be2010-05-12 18:28:57 -07001398static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
Roland McGrath6d760132007-10-16 23:26:40 -07001399 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
1409static 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 &notes_attrs->attrs[i]);
Alexey Dobriyane9432092008-09-23 23:51:11 +04001416 kobject_put(notes_attrs->dir);
Roland McGrath6d760132007-10-16 23:26:40 -07001417 }
1418 kfree(notes_attrs);
1419}
1420
Rusty Russell8f6d0372010-08-05 12:59:09 -06001421static void add_notes_attrs(struct module *mod, const struct load_info *info)
Roland McGrath6d760132007-10-16 23:26:40 -07001422{
1423 unsigned int notes, loaded, i;
1424 struct module_notes_attrs *notes_attrs;
1425 struct bin_attribute *nattr;
1426
Ingo Molnarea6bff32009-08-28 10:44:56 +02001427 /* failed to create section attributes, so can't create notes */
1428 if (!mod->sect_attrs)
1429 return;
1430
Roland McGrath6d760132007-10-16 23:26:40 -07001431 /* Count notes sections and allocate structures. */
1432 notes = 0;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001433 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 McGrath6d760132007-10-16 23:26:40 -07001436 ++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 = &notes_attrs->attrs[0];
Rusty Russell8f6d0372010-08-05 12:59:09 -06001449 for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
1450 if (sect_empty(&info->sechdrs[i]))
Roland McGrath6d760132007-10-16 23:26:40 -07001451 continue;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001452 if (info->sechdrs[i].sh_type == SHT_NOTE) {
Eric W. Biederman361795b2010-02-12 13:41:56 -08001453 sysfs_bin_attr_init(nattr);
Roland McGrath6d760132007-10-16 23:26:40 -07001454 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1455 nattr->attr.mode = S_IRUGO;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001456 nattr->size = info->sechdrs[i].sh_size;
1457 nattr->private = (void *) info->sechdrs[i].sh_addr;
Roland McGrath6d760132007-10-16 23:26:40 -07001458 nattr->read = module_notes_read;
1459 ++nattr;
1460 }
1461 ++loaded;
1462 }
1463
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001464 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
Roland McGrath6d760132007-10-16 23:26:40 -07001465 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 &notes_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
1480static 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 Torvalds1da177e2005-04-16 15:20:36 -07001486#else
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001487
Rusty Russell8f6d0372010-08-05 12:59:09 -06001488static inline void add_sect_attrs(struct module *mod,
1489 const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490{
1491}
1492
1493static inline void remove_sect_attrs(struct module *mod)
1494{
1495}
Roland McGrath6d760132007-10-16 23:26:40 -07001496
Rusty Russell8f6d0372010-08-05 12:59:09 -06001497static inline void add_notes_attrs(struct module *mod,
1498 const struct load_info *info)
Roland McGrath6d760132007-10-16 23:26:40 -07001499{
1500}
1501
1502static inline void remove_notes_attrs(struct module *mod)
1503{
1504}
Rusty Russell8f6d0372010-08-05 12:59:09 -06001505#endif /* CONFIG_KALLSYMS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001507static void add_usage_links(struct module *mod)
1508{
1509#ifdef CONFIG_MODULE_UNLOAD
1510 struct module_use *use;
1511 int nowarn;
1512
Rusty Russell75676502010-06-05 11:17:36 -06001513 mutex_lock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001514 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 Russell75676502010-06-05 11:17:36 -06001518 mutex_unlock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001519#endif
1520}
1521
1522static void del_usage_links(struct module *mod)
1523{
1524#ifdef CONFIG_MODULE_UNLOAD
1525 struct module_use *use;
1526
Rusty Russell75676502010-06-05 11:17:36 -06001527 mutex_lock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001528 list_for_each_entry(use, &mod->target_list, target_list)
1529 sysfs_remove_link(use->target->holders_dir, mod->name);
Rusty Russell75676502010-06-05 11:17:36 -06001530 mutex_unlock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001531#endif
1532}
1533
Rusty Russell6407ebb22010-06-05 11:17:36 -06001534static int module_add_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001535{
1536 struct module_attribute *attr;
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001537 struct module_attribute *temp_attr;
Matt Domschc988d2b2005-06-23 22:05:15 -07001538 int error = 0;
1539 int i;
1540
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001541 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 Domschc988d2b2005-06-23 22:05:15 -07001548 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1549 if (!attr->test ||
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001550 (attr->test && attr->test(mod))) {
1551 memcpy(temp_attr, attr, sizeof(*temp_attr));
Eric W. Biederman361795b2010-02-12 13:41:56 -08001552 sysfs_attr_init(&temp_attr->attr);
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001553 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1554 ++temp_attr;
1555 }
Matt Domschc988d2b2005-06-23 22:05:15 -07001556 }
1557 return error;
1558}
1559
Rusty Russell6407ebb22010-06-05 11:17:36 -06001560static void module_remove_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001561{
1562 struct module_attribute *attr;
1563 int i;
1564
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001565 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 Domschc988d2b2005-06-23 22:05:15 -07001569 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001570 if (attr->free)
1571 attr->free(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001572 }
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001573 kfree(mod->modinfo_attrs);
Matt Domschc988d2b2005-06-23 22:05:15 -07001574}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575
Li Zhong942e4432013-09-03 16:33:57 +09301576static 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 Russell6407ebb22010-06-05 11:17:36 -06001584static int mod_sysfs_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585{
1586 int err;
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001587 struct kobject *kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -07001589 if (!module_sysfs_initialized) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001590 pr_err("%s: module sysfs not initialized\n", mod->name);
Ed Swierk1cc5f712006-09-25 16:25:36 -07001591 err = -EINVAL;
1592 goto out;
1593 }
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001594
1595 kobj = kset_find_obj(module_kset, mod->name);
1596 if (kobj) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001597 pr_err("%s: module is already loaded\n", mod->name);
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001598 kobject_put(kobj);
1599 err = -EINVAL;
1600 goto out;
1601 }
1602
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 mod->mkobj.mod = mod;
Kay Sieverse17e0f52006-11-24 12:15:25 +01001604
Greg Kroah-Hartmanac3c8142007-12-17 23:05:35 -07001605 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 Zhong942e4432013-09-03 16:33:57 +09301610 mod_kobject_put(mod);
Kay Sievers270a6c42007-01-18 13:26:15 +01001611
Kay Sievers97c146e2007-11-29 23:46:11 +01001612 /* delay uevent until full sysfs population */
Kay Sievers270a6c42007-01-18 13:26:15 +01001613out:
1614 return err;
1615}
1616
Rusty Russell6407ebb22010-06-05 11:17:36 -06001617static int mod_sysfs_setup(struct module *mod,
Rusty Russell8f6d0372010-08-05 12:59:09 -06001618 const struct load_info *info,
Kay Sievers270a6c42007-01-18 13:26:15 +01001619 struct kernel_param *kparam,
1620 unsigned int num_params)
1621{
1622 int err;
1623
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001624 err = mod_sysfs_init(mod);
1625 if (err)
1626 goto out;
1627
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001628 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
Akinobu Mita240936e2007-04-26 00:12:09 -07001629 if (!mod->holders_dir) {
1630 err = -ENOMEM;
Kay Sievers270a6c42007-01-18 13:26:15 +01001631 goto out_unreg;
Akinobu Mita240936e2007-04-26 00:12:09 -07001632 }
Kay Sievers270a6c42007-01-18 13:26:15 +01001633
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 err = module_param_sysfs_setup(mod, kparam, num_params);
1635 if (err)
Kay Sievers270a6c42007-01-18 13:26:15 +01001636 goto out_unreg_holders;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637
Matt Domschc988d2b2005-06-23 22:05:15 -07001638 err = module_add_modinfo_attrs(mod);
1639 if (err)
Kay Sieverse17e0f52006-11-24 12:15:25 +01001640 goto out_unreg_param;
Matt Domschc988d2b2005-06-23 22:05:15 -07001641
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001642 add_usage_links(mod);
Rusty Russell8f6d0372010-08-05 12:59:09 -06001643 add_sect_attrs(mod, info);
1644 add_notes_attrs(mod, info);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001645
Kay Sieverse17e0f52006-11-24 12:15:25 +01001646 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647 return 0;
1648
Kay Sieverse17e0f52006-11-24 12:15:25 +01001649out_unreg_param:
1650 module_param_sysfs_remove(mod);
Kay Sievers270a6c42007-01-18 13:26:15 +01001651out_unreg_holders:
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001652 kobject_put(mod->holders_dir);
Kay Sievers270a6c42007-01-18 13:26:15 +01001653out_unreg:
Li Zhong942e4432013-09-03 16:33:57 +09301654 mod_kobject_put(mod);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001655out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 return err;
1657}
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001658
1659static void mod_sysfs_fini(struct module *mod)
1660{
Rusty Russell8f6d0372010-08-05 12:59:09 -06001661 remove_notes_attrs(mod);
1662 remove_sect_attrs(mod);
Li Zhong942e4432013-09-03 16:33:57 +09301663 mod_kobject_put(mod);
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001664}
1665
Rusty Russell8f6d0372010-08-05 12:59:09 -06001666#else /* !CONFIG_SYSFS */
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001667
Rusty Russell8f6d0372010-08-05 12:59:09 -06001668static int mod_sysfs_setup(struct module *mod,
1669 const struct load_info *info,
Rusty Russell6407ebb22010-06-05 11:17:36 -06001670 struct kernel_param *kparam,
1671 unsigned int num_params)
1672{
1673 return 0;
1674}
1675
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001676static void mod_sysfs_fini(struct module *mod)
1677{
1678}
1679
Rusty Russell36b03602010-08-05 12:59:09 -06001680static void module_remove_modinfo_attrs(struct module *mod)
1681{
1682}
1683
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001684static void del_usage_links(struct module *mod)
1685{
1686}
1687
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001688#endif /* CONFIG_SYSFS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689
Rusty Russell36b03602010-08-05 12:59:09 -06001690static void mod_sysfs_teardown(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691{
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001692 del_usage_links(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001693 module_remove_modinfo_attrs(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694 module_param_sysfs_remove(mod);
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001695 kobject_put(mod->mkobj.drivers_dir);
1696 kobject_put(mod->holders_dir);
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001697 mod_sysfs_fini(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698}
1699
matthieu castet84e1c6b2010-11-16 22:35:16 +01001700#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 */
1705void 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
1714static 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 Glauber01526ed2011-05-19 16:55:26 -06001744static void unset_module_core_ro_nx(struct module *mod)
matthieu castet84e1c6b2010-11-16 22:35:16 +01001745{
Jan Glauber01526ed2011-05-19 16:55:26 -06001746 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
1754static 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 castet84e1c6b2010-11-16 22:35:16 +01001762}
1763
1764/* Iterate through all modules and set each module's text as RW */
Daniel J Blueman5d05c702011-03-08 22:01:47 +08001765void set_all_modules_text_rw(void)
matthieu castet84e1c6b2010-11-16 22:35:16 +01001766{
1767 struct module *mod;
1768
1769 mutex_lock(&module_mutex);
1770 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10301771 if (mod->state == MODULE_STATE_UNFORMED)
1772 continue;
matthieu castet84e1c6b2010-11-16 22:35:16 +01001773 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 Blueman5d05c702011-03-08 22:01:47 +08001788void set_all_modules_text_ro(void)
matthieu castet84e1c6b2010-11-16 22:35:16 +01001789{
1790 struct module *mod;
1791
1792 mutex_lock(&module_mutex);
1793 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10301794 if (mod->state == MODULE_STATE_UNFORMED)
1795 continue;
matthieu castet84e1c6b2010-11-16 22:35:16 +01001796 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
1810static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { }
Jan Glauber01526ed2011-05-19 16:55:26 -06001811static void unset_module_core_ro_nx(struct module *mod) { }
1812static void unset_module_init_ro_nx(struct module *mod) { }
matthieu castet84e1c6b2010-11-16 22:35:16 +01001813#endif
1814
Jonas Bonn74e08fc2011-06-30 21:22:11 +02001815void __weak module_free(struct module *mod, void *module_region)
1816{
1817 vfree(module_region);
1818}
1819
1820void __weak module_arch_cleanup(struct module *mod)
1821{
1822}
1823
Rusty Russell75676502010-06-05 11:17:36 -06001824/* Free a module, remove from lists, etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825static void free_module(struct module *mod)
1826{
Li Zefan7ead8b82009-08-17 16:56:28 +08001827 trace_module_free(mod);
1828
Rusty Russell36b03602010-08-05 12:59:09 -06001829 mod_sysfs_teardown(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001830
Rusty Russell944a1fa2013-04-17 13:20:03 +09301831 /* We leave it in list to prevent duplicate loads, but make sure
1832 * that noone uses it while it's being deconstructed. */
Prarit Bhargavad3051b42014-10-14 02:51:39 +10301833 mutex_lock(&module_mutex);
Rusty Russell944a1fa2013-04-17 13:20:03 +09301834 mod->state = MODULE_STATE_UNFORMED;
Prarit Bhargavad3051b42014-10-14 02:51:39 +10301835 mutex_unlock(&module_mutex);
Rusty Russell944a1fa2013-04-17 13:20:03 +09301836
Jason Baronb82bab4b2010-07-27 13:18:01 -07001837 /* Remove dynamic debug info */
1838 ddebug_remove_module(mod->name);
1839
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840 /* Arch-specific cleanup. */
1841 module_arch_cleanup(mod);
1842
1843 /* Module unload stuff */
1844 module_unload_free(mod);
1845
Rusty Russelle180a6b2009-03-31 13:05:29 -06001846 /* Free any allocated parameters. */
1847 destroy_params(mod->kp, mod->num_kp);
1848
Rusty Russell944a1fa2013-04-17 13:20:03 +09301849 /* Now we can delete it from the lists */
1850 mutex_lock(&module_mutex);
Masami Hiramatsu461e34a2014-11-10 09:27:29 +10301851 /* 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 Russell944a1fa2013-04-17 13:20:03 +09301856 mutex_unlock(&module_mutex);
1857
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858 /* This may be NULL, but that's OK */
Jan Glauber01526ed2011-05-19 16:55:26 -06001859 unset_module_init_ro_nx(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 module_free(mod, mod->module_init);
1861 kfree(mod->args);
Tejun Heo259354d2010-03-10 18:56:10 +09001862 percpu_modfree(mod);
Rusty Russell9f85a4b2010-08-05 12:59:04 -06001863
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001864 /* Free lock-classes: */
1865 lockdep_free_key_range(mod->module_core, mod->core_size);
1866
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867 /* Finally, free the core (containing the module structure) */
Jan Glauber01526ed2011-05-19 16:55:26 -06001868 unset_module_core_ro_nx(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 module_free(mod, mod->module_core);
Bernd Schmidteb8cdec2009-09-21 17:03:57 -07001870
1871#ifdef CONFIG_MPU
1872 update_protections(current->mm);
1873#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874}
1875
1876void *__symbol_get(const char *symbol)
1877{
1878 struct module *owner;
Tim Abbott414fd312008-12-05 19:03:56 -05001879 const struct kernel_symbol *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880
Rusty Russell24da1cb2007-07-15 23:41:46 -07001881 preempt_disable();
Tim Abbott414fd312008-12-05 19:03:56 -05001882 sym = find_symbol(symbol, &owner, NULL, true, true);
1883 if (sym && strong_try_module_get(owner))
1884 sym = NULL;
Rusty Russell24da1cb2007-07-15 23:41:46 -07001885 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886
Tim Abbott414fd312008-12-05 19:03:56 -05001887 return sym ? (void *)sym->value : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888}
1889EXPORT_SYMBOL_GPL(__symbol_get);
1890
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001891/*
1892 * Ensure that an exported symbol [global namespace] does not already exist
Robert P. J. Day02a3e592007-05-09 07:26:28 +02001893 * in the kernel or in some other module's exported symbol table.
Rusty Russellbe593f42010-06-05 11:17:37 -06001894 *
1895 * You must hold the module_mutex.
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001896 */
1897static int verify_export_symbols(struct module *mod)
1898{
Rusty Russellb2111042008-05-01 21:15:00 -05001899 unsigned int i;
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001900 struct module *owner;
Rusty Russellb2111042008-05-01 21:15:00 -05001901 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 Vlasenkof7f5b672008-07-22 19:24:26 -05001909#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russellb2111042008-05-01 21:15:00 -05001910 { mod->unused_syms, mod->num_unused_syms },
1911 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001912#endif
Rusty Russellb2111042008-05-01 21:15:00 -05001913 };
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001914
Rusty Russellb2111042008-05-01 21:15:00 -05001915 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1916 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
Rusty Russellbe593f42010-06-05 11:17:37 -06001917 if (find_symbol(s->name, &owner, NULL, true, false)) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001918 pr_err("%s: exports duplicate symbol %s"
Rusty Russellb2111042008-05-01 21:15:00 -05001919 " (owned by %s)\n",
1920 mod->name, s->name, module_name(owner));
1921 return -ENOEXEC;
1922 }
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001923 }
Rusty Russellb2111042008-05-01 21:15:00 -05001924 }
1925 return 0;
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001926}
1927
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -08001928/* Change all symbols so that st_value encodes the pointer directly. */
Rusty Russell49668682010-08-05 12:59:10 -06001929static int simplify_symbols(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930{
Rusty Russell49668682010-08-05 12:59:10 -06001931 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
1932 Elf_Sym *sym = (void *)symsec->sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933 unsigned long secbase;
Rusty Russell49668682010-08-05 12:59:10 -06001934 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935 int ret = 0;
Tim Abbott414fd312008-12-05 19:03:56 -05001936 const struct kernel_symbol *ksym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001937
Rusty Russell49668682010-08-05 12:59:10 -06001938 for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
1939 const char *name = info->strtab + sym[i].st_name;
1940
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941 switch (sym[i].st_shndx) {
1942 case SHN_COMMON:
Joe Mario80375982014-02-08 09:01:09 +01001943 /* Ignore common symbols */
1944 if (!strncmp(name, "__gnu_lto", 9))
1945 break;
1946
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 /* We compiled with -fno-common. These are not
1948 supposed to happen. */
Jim Cromie5e124162011-12-06 12:11:31 -07001949 pr_debug("Common symbol: %s\n", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950 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 Cromie5e124162011-12-06 12:11:31 -07001957 pr_debug("Absolute symbol: 0x%08lx\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001958 (long)sym[i].st_value);
1959 break;
1960
1961 case SHN_UNDEF:
Rusty Russell49668682010-08-05 12:59:10 -06001962 ksym = resolve_symbol_wait(mod, info, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001963 /* Ok if resolved. */
Rusty Russell9bea7f22010-06-05 11:17:37 -06001964 if (ksym && !IS_ERR(ksym)) {
Tim Abbott414fd312008-12-05 19:03:56 -05001965 sym[i].st_value = ksym->value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001966 break;
Tim Abbott414fd312008-12-05 19:03:56 -05001967 }
1968
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969 /* Ok if weak. */
Rusty Russell9bea7f22010-06-05 11:17:37 -06001970 if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971 break;
1972
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001973 pr_warn("%s: Unknown symbol %s (err %li)\n",
1974 mod->name, name, PTR_ERR(ksym));
Rusty Russell9bea7f22010-06-05 11:17:37 -06001975 ret = PTR_ERR(ksym) ?: -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976 break;
1977
1978 default:
1979 /* Divert to percpu allocation if a percpu var. */
Rusty Russell49668682010-08-05 12:59:10 -06001980 if (sym[i].st_shndx == info->index.pcpu)
Tejun Heo259354d2010-03-10 18:56:10 +09001981 secbase = (unsigned long)mod_percpu(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982 else
Rusty Russell49668682010-08-05 12:59:10 -06001983 secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984 sym[i].st_value += secbase;
1985 break;
1986 }
1987 }
1988
1989 return ret;
1990}
1991
Rusty Russell49668682010-08-05 12:59:10 -06001992static int apply_relocations(struct module *mod, const struct load_info *info)
Rusty Russell22e268e2010-08-05 12:59:05 -06001993{
1994 unsigned int i;
1995 int err = 0;
1996
1997 /* Now do relocations. */
Rusty Russell49668682010-08-05 12:59:10 -06001998 for (i = 1; i < info->hdr->e_shnum; i++) {
1999 unsigned int infosec = info->sechdrs[i].sh_info;
Rusty Russell22e268e2010-08-05 12:59:05 -06002000
2001 /* Not a valid relocation section? */
Rusty Russell49668682010-08-05 12:59:10 -06002002 if (infosec >= info->hdr->e_shnum)
Rusty Russell22e268e2010-08-05 12:59:05 -06002003 continue;
2004
2005 /* Don't bother with non-allocated sections */
Rusty Russell49668682010-08-05 12:59:10 -06002006 if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
Rusty Russell22e268e2010-08-05 12:59:05 -06002007 continue;
2008
Rusty Russell49668682010-08-05 12:59:10 -06002009 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 Russell22e268e2010-08-05 12:59:05 -06002015 if (err < 0)
2016 break;
2017 }
2018 return err;
2019}
2020
Helge Deller088af9a2008-12-31 12:31:18 +01002021/* Additional bytes needed by arch in front of individual sections */
2022unsigned 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 Torvalds1da177e2005-04-16 15:20:36 -07002029/* Update size with this section: return offset. */
Helge Deller088af9a2008-12-31 12:31:18 +01002030static long get_offset(struct module *mod, unsigned int *size,
2031 Elf_Shdr *sechdr, unsigned int section)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032{
2033 long ret;
2034
Helge Deller088af9a2008-12-31 12:31:18 +01002035 *size += arch_mod_section_prepend(mod, section);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002036 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 Russell49668682010-08-05 12:59:10 -06002045static void layout_sections(struct module *mod, struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002046{
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 Russell49668682010-08-05 12:59:10 -06002058 for (i = 0; i < info->hdr->e_shnum; i++)
2059 info->sechdrs[i].sh_entsize = ~0UL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060
Jim Cromie5e124162011-12-06 12:11:31 -07002061 pr_debug("Core section allocation order:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
Rusty Russell49668682010-08-05 12:59:10 -06002063 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 Torvalds1da177e2005-04-16 15:20:36 -07002066
2067 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2068 || (s->sh_flags & masks[m][1])
2069 || s->sh_entsize != ~0UL
Rusty Russell49668682010-08-05 12:59:10 -06002070 || strstarts(sname, ".init"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071 continue;
Helge Deller088af9a2008-12-31 12:31:18 +01002072 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
Jim Cromie5e124162011-12-06 12:11:31 -07002073 pr_debug("\t%s\n", sname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002074 }
matthieu castet84e1c6b2010-11-16 22:35:16 +01002075 switch (m) {
2076 case 0: /* executable */
2077 mod->core_size = debug_align(mod->core_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078 mod->core_text_size = mod->core_size;
matthieu castet84e1c6b2010-11-16 22:35:16 +01002079 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 Torvalds1da177e2005-04-16 15:20:36 -07002088 }
2089
Jim Cromie5e124162011-12-06 12:11:31 -07002090 pr_debug("Init section allocation order:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
Rusty Russell49668682010-08-05 12:59:10 -06002092 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 Torvalds1da177e2005-04-16 15:20:36 -07002095
2096 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2097 || (s->sh_flags & masks[m][1])
2098 || s->sh_entsize != ~0UL
Rusty Russell49668682010-08-05 12:59:10 -06002099 || !strstarts(sname, ".init"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100 continue;
Helge Deller088af9a2008-12-31 12:31:18 +01002101 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 | INIT_OFFSET_MASK);
Jim Cromie5e124162011-12-06 12:11:31 -07002103 pr_debug("\t%s\n", sname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002104 }
matthieu castet84e1c6b2010-11-16 22:35:16 +01002105 switch (m) {
2106 case 0: /* executable */
2107 mod->init_size = debug_align(mod->init_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108 mod->init_text_size = mod->init_size;
matthieu castet84e1c6b2010-11-16 22:35:16 +01002109 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 Torvalds1da177e2005-04-16 15:20:36 -07002118 }
2119}
2120
Linus Torvalds1da177e2005-04-16 15:20:36 -07002121static void set_license(struct module *mod, const char *license)
2122{
2123 if (!license)
2124 license = "unspecified";
2125
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002126 if (!license_is_gpl_compatible(license)) {
Andi Kleen25ddbb12008-10-15 22:01:41 -07002127 if (!test_taint(TAINT_PROPRIETARY_MODULE))
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002128 pr_warn("%s: module license '%s' taints kernel.\n",
2129 mod->name, license);
Rusty Russell373d4d02013-01-21 17:17:39 +10302130 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2131 LOCKDEP_NOW_UNRELIABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002132 }
2133}
2134
2135/* Parse tag=value strings from .modinfo section */
2136static 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 Russell49668682010-08-05 12:59:10 -06002154static char *get_modinfo(struct load_info *info, const char *tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155{
2156 char *p;
2157 unsigned int taglen = strlen(tag);
Rusty Russell49668682010-08-05 12:59:10 -06002158 Elf_Shdr *infosec = &info->sechdrs[info->index.info];
2159 unsigned long size = infosec->sh_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160
Rusty Russell49668682010-08-05 12:59:10 -06002161 for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002162 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
2163 return p + taglen + 1;
2164 }
2165 return NULL;
2166}
2167
Rusty Russell49668682010-08-05 12:59:10 -06002168static void setup_modinfo(struct module *mod, struct load_info *info)
Matt Domschc988d2b2005-06-23 22:05:15 -07002169{
2170 struct module_attribute *attr;
2171 int i;
2172
2173 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2174 if (attr->setup)
Rusty Russell49668682010-08-05 12:59:10 -06002175 attr->setup(mod, get_modinfo(info, attr->attr.name));
Matt Domschc988d2b2005-06-23 22:05:15 -07002176 }
2177}
Matt Domschc988d2b2005-06-23 22:05:15 -07002178
Rusty Russella263f772009-09-25 00:32:58 -06002179static 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 Torvalds1da177e2005-04-16 15:20:36 -07002190#ifdef CONFIG_KALLSYMS
WANG Cong15bba372008-07-24 15:41:48 +01002191
2192/* lookup symbol in given range of kernel_symbols */
2193static const struct kernel_symbol *lookup_symbol(const char *name,
2194 const struct kernel_symbol *start,
2195 const struct kernel_symbol *stop)
2196{
Alessio Igor Bogani9d634872011-05-18 22:35:59 +02002197 return bsearch(name, start, stop - start,
2198 sizeof(struct kernel_symbol), cmp_name);
WANG Cong15bba372008-07-24 15:41:48 +01002199}
2200
Tim Abbottca4787b2009-01-05 08:40:10 -06002201static int is_exported(const char *name, unsigned long value,
2202 const struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203{
Tim Abbottca4787b2009-01-05 08:40:10 -06002204 const struct kernel_symbol *ks;
2205 if (!mod)
2206 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
Sam Ravnborg3fd68052006-02-08 21:16:45 +01002207 else
Tim Abbottca4787b2009-01-05 08:40:10 -06002208 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
2209 return ks != NULL && ks->value == value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002210}
2211
2212/* As per nm */
Rusty Russelleded41c2010-08-05 12:59:07 -06002213static char elf_type(const Elf_Sym *sym, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214{
Rusty Russelleded41c2010-08-05 12:59:07 -06002215 const Elf_Shdr *sechdrs = info->sechdrs;
2216
Linus Torvalds1da177e2005-04-16 15:20:36 -07002217 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 Russelleded41c2010-08-05 12:59:07 -06002246 if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
2247 ".debug")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 return 'n';
Rusty Russelleded41c2010-08-05 12:59:07 -06002249 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250 return '?';
2251}
2252
Jan Beulich4a496222009-07-06 14:50:42 +01002253static 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 Cernekee48fd1182012-01-13 09:32:14 +10302274/*
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 Russell49668682010-08-05 12:59:10 -06002281static void layout_symtab(struct module *mod, struct load_info *info)
Jan Beulich4a496222009-07-06 14:50:42 +01002282{
Rusty Russell49668682010-08-05 12:59:10 -06002283 Elf_Shdr *symsect = info->sechdrs + info->index.sym;
2284 Elf_Shdr *strsect = info->sechdrs + info->index.str;
Jan Beulich4a496222009-07-06 14:50:42 +01002285 const Elf_Sym *src;
Satoru Takeuchi54523ec2012-12-05 12:29:04 +10302286 unsigned int i, nsrc, ndst, strtab_size = 0;
Jan Beulich4a496222009-07-06 14:50:42 +01002287
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 Russell49668682010-08-05 12:59:10 -06002291 info->index.sym) | INIT_OFFSET_MASK;
Jim Cromie5e124162011-12-06 12:11:31 -07002292 pr_debug("\t%s\n", info->secstrings + symsect->sh_name);
Jan Beulich4a496222009-07-06 14:50:42 +01002293
Rusty Russell49668682010-08-05 12:59:10 -06002294 src = (void *)info->hdr + symsect->sh_offset;
Jan Beulich4a496222009-07-06 14:50:42 +01002295 nsrc = symsect->sh_size / sizeof(*src);
Kevin Cernekee70b1e9162011-11-12 19:08:55 -08002296
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302297 /* Compute total space required for the core symbols' strtab. */
Rusty Russell59ef28b2012-10-25 10:49:25 +10302298 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 Cernekee48fd1182012-01-13 09:32:14 +10302302 ndst++;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002303 }
Rusty Russell59ef28b2012-10-25 10:49:25 +10302304 }
Jan Beulich4a496222009-07-06 14:50:42 +01002305
2306 /* Append room for core symbols at end of core part. */
Rusty Russell49668682010-08-05 12:59:10 -06002307 info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302308 info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
2309 mod->core_size += strtab_size;
Jan Beulich4a496222009-07-06 14:50:42 +01002310
Jan Beulich554bdfe2009-07-06 14:51:44 +01002311 /* 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 Russell49668682010-08-05 12:59:10 -06002314 info->index.str) | INIT_OFFSET_MASK;
Jim Cromie5e124162011-12-06 12:11:31 -07002315 pr_debug("\t%s\n", info->secstrings + strsect->sh_name);
Jan Beulich4a496222009-07-06 14:50:42 +01002316}
2317
Rusty Russell811d66a2010-08-05 12:59:12 -06002318static void add_kallsyms(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319{
Jan Beulich4a496222009-07-06 14:50:42 +01002320 unsigned int i, ndst;
2321 const Elf_Sym *src;
2322 Elf_Sym *dst;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002323 char *s;
Rusty Russelleded41c2010-08-05 12:59:07 -06002324 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325
Rusty Russelleded41c2010-08-05 12:59:07 -06002326 mod->symtab = (void *)symsec->sh_addr;
2327 mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
Rusty Russell511ca6a2010-08-05 12:59:08 -06002328 /* Make sure we get permanent strtab: don't use info->strtab. */
2329 mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002330
2331 /* Set types up while we still have access to sections. */
2332 for (i = 0; i < mod->num_symtab; i++)
Rusty Russelleded41c2010-08-05 12:59:07 -06002333 mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
Jan Beulich4a496222009-07-06 14:50:42 +01002334
Rusty Russelld9131882010-08-05 12:59:08 -06002335 mod->core_symtab = dst = mod->module_core + info->symoffs;
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302336 mod->core_strtab = s = mod->module_core + info->stroffs;
Jan Beulich4a496222009-07-06 14:50:42 +01002337 src = mod->symtab;
Rusty Russell59ef28b2012-10-25 10:49:25 +10302338 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 Beulich4a496222009-07-06 14:50:42 +01002346 }
2347 mod->core_num_syms = ndst;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348}
2349#else
Rusty Russell49668682010-08-05 12:59:10 -06002350static inline void layout_symtab(struct module *mod, struct load_info *info)
Jan Beulich4a496222009-07-06 14:50:42 +01002351{
2352}
Paul Mundt3ae91c22009-10-01 15:43:54 -07002353
Michał Mirosławabbce902010-09-20 01:58:08 +02002354static void add_kallsyms(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355{
2356}
2357#endif /* CONFIG_KALLSYMS */
2358
Jason Barone9d376f2009-02-05 11:51:38 -05002359static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
Rusty Russell5e458cc2008-10-22 10:00:13 -05002360{
Rusty Russell811d66a2010-08-05 12:59:12 -06002361 if (!debug)
2362 return;
Jason Barone9d376f2009-02-05 11:51:38 -05002363#ifdef CONFIG_DYNAMIC_DEBUG
2364 if (ddebug_add_module(debug, num, debug->modname))
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002365 pr_err("dynamic debug error adding module: %s\n",
2366 debug->modname);
Jason Barone9d376f2009-02-05 11:51:38 -05002367#endif
Rusty Russell5e458cc2008-10-22 10:00:13 -05002368}
Jason Baron346e15b2008-08-12 16:46:19 -04002369
Yehuda Sadehff49d742010-07-03 13:07:35 +10002370static void dynamic_debug_remove(struct _ddebug *debug)
2371{
2372 if (debug)
2373 ddebug_remove_module(debug->modname);
2374}
2375
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002376void * __weak module_alloc(unsigned long size)
2377{
Rusty Russell82fab442012-12-11 09:38:33 +10302378 return vmalloc_exec(size);
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002379}
2380
Rusty Russell3a642e92008-07-22 19:24:28 -05002381static void *module_alloc_update_bounds(unsigned long size)
2382{
2383 void *ret = module_alloc(size);
2384
2385 if (ret) {
Rusty Russell75676502010-06-05 11:17:36 -06002386 mutex_lock(&module_mutex);
Rusty Russell3a642e92008-07-22 19:24:28 -05002387 /* 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 Russell75676502010-06-05 11:17:36 -06002392 mutex_unlock(&module_mutex);
Rusty Russell3a642e92008-07-22 19:24:28 -05002393 }
2394 return ret;
2395}
2396
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002397#ifdef CONFIG_DEBUG_KMEMLEAK
Rusty Russell49668682010-08-05 12:59:10 -06002398static void kmemleak_load_module(const struct module *mod,
2399 const struct load_info *info)
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002400{
2401 unsigned int i;
2402
2403 /* only scan the sections containing data */
Catalin Marinasc017b4b2009-10-28 13:33:09 +00002404 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002405
Rusty Russell49668682010-08-05 12:59:10 -06002406 for (i = 1; i < info->hdr->e_shnum; i++) {
Steven Rostedt06c94942013-05-15 20:33:01 +01002407 /* 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 Marinas4f2294b2009-06-11 13:23:20 +01002411 continue;
2412
Rusty Russell49668682010-08-05 12:59:10 -06002413 kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
2414 info->sechdrs[i].sh_size, GFP_KERNEL);
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002415 }
2416}
2417#else
Rusty Russell49668682010-08-05 12:59:10 -06002418static inline void kmemleak_load_module(const struct module *mod,
2419 const struct load_info *info)
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002420{
2421}
2422#endif
2423
Rusty Russell106a4ee2012-09-26 10:09:40 +01002424#ifdef CONFIG_MODULE_SIG
Kees Cook34e11692012-10-16 07:31:07 +10302425static int module_sig_check(struct load_info *info)
Rusty Russell106a4ee2012-09-26 10:09:40 +01002426{
2427 int err = -ENOKEY;
Kees Cook34e11692012-10-16 07:31:07 +10302428 const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
2429 const void *mod = info->hdr;
Rusty Russell106a4ee2012-09-26 10:09:40 +01002430
Kees Cook34e11692012-10-16 07:31:07 +10302431 if (info->len > markerlen &&
2432 memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) {
David Howellscaabe242012-10-20 01:19:29 +01002433 /* We truncate the module to discard the signature */
Kees Cook34e11692012-10-16 07:31:07 +10302434 info->len -= markerlen;
2435 err = mod_verify_sig(mod, &info->len);
Rusty Russell106a4ee2012-09-26 10:09:40 +01002436 }
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 Cook34e11692012-10-16 07:31:07 +10302450static int module_sig_check(struct load_info *info)
Rusty Russell106a4ee2012-09-26 10:09:40 +01002451{
2452 return 0;
2453}
2454#endif /* !CONFIG_MODULE_SIG */
2455
Kees Cook34e11692012-10-16 07:31:07 +10302456/* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2457static int elf_header_check(struct load_info *info)
Rusty Russell40dd2562010-08-05 12:59:03 -06002458{
Kees Cook34e11692012-10-16 07:31:07 +10302459 if (info->len < sizeof(*(info->hdr)))
Rusty Russell40dd2562010-08-05 12:59:03 -06002460 return -ENOEXEC;
2461
Kees Cook34e11692012-10-16 07:31:07 +10302462 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. */
2477static int copy_module_from_user(const void __user *umod, unsigned long len,
2478 struct load_info *info)
2479{
Kees Cook2e72d512012-10-16 07:32:07 +10302480 int err;
2481
Kees Cook34e11692012-10-16 07:31:07 +10302482 info->len = len;
2483 if (info->len < sizeof(*(info->hdr)))
Rusty Russell40dd2562010-08-05 12:59:03 -06002484 return -ENOEXEC;
2485
Kees Cook2e72d512012-10-16 07:32:07 +10302486 err = security_kernel_module_from_file(NULL);
2487 if (err)
2488 return err;
2489
Rusty Russell40dd2562010-08-05 12:59:03 -06002490 /* Suck in entire file: we'll want most of it. */
Kees Cook34e11692012-10-16 07:31:07 +10302491 info->hdr = vmalloc(info->len);
2492 if (!info->hdr)
Rusty Russell40dd2562010-08-05 12:59:03 -06002493 return -ENOMEM;
2494
Kees Cook34e11692012-10-16 07:31:07 +10302495 if (copy_from_user(info->hdr, umod, info->len) != 0) {
2496 vfree(info->hdr);
2497 return -EFAULT;
Rusty Russell40dd2562010-08-05 12:59:03 -06002498 }
2499
Rusty Russell40dd2562010-08-05 12:59:03 -06002500 return 0;
Kees Cook34e11692012-10-16 07:31:07 +10302501}
Rusty Russell40dd2562010-08-05 12:59:03 -06002502
Kees Cook34e11692012-10-16 07:31:07 +10302503/* Sets info->hdr and info->len. */
2504static int copy_module_from_fd(int fd, struct load_info *info)
2505{
Al Viroa2e05782013-08-30 12:41:41 -04002506 struct fd f = fdget(fd);
Kees Cook34e11692012-10-16 07:31:07 +10302507 int err;
2508 struct kstat stat;
2509 loff_t pos;
2510 ssize_t bytes = 0;
2511
Al Viroa2e05782013-08-30 12:41:41 -04002512 if (!f.file)
Kees Cook34e11692012-10-16 07:31:07 +10302513 return -ENOEXEC;
2514
Al Viroa2e05782013-08-30 12:41:41 -04002515 err = security_kernel_module_from_file(f.file);
Kees Cook2e72d512012-10-16 07:32:07 +10302516 if (err)
2517 goto out;
2518
Al Viroa2e05782013-08-30 12:41:41 -04002519 err = vfs_getattr(&f.file->f_path, &stat);
Kees Cook34e11692012-10-16 07:31:07 +10302520 if (err)
2521 goto out;
2522
2523 if (stat.size > INT_MAX) {
2524 err = -EFBIG;
2525 goto out;
2526 }
Sasha Levin52441fa2013-01-03 11:09:53 +10302527
2528 /* Don't hand 0 to vmalloc, it whines. */
2529 if (stat.size == 0) {
2530 err = -EINVAL;
2531 goto out;
2532 }
2533
Kees Cook34e11692012-10-16 07:31:07 +10302534 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 Viroa2e05782013-08-30 12:41:41 -04002542 bytes = kernel_read(f.file, pos, (char *)(info->hdr) + pos,
Kees Cook34e11692012-10-16 07:31:07 +10302543 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
2555out:
Al Viroa2e05782013-08-30 12:41:41 -04002556 fdput(f);
Rusty Russell40dd2562010-08-05 12:59:03 -06002557 return err;
2558}
2559
Rusty Russelld9131882010-08-05 12:59:08 -06002560static void free_copy(struct load_info *info)
2561{
Rusty Russelld9131882010-08-05 12:59:08 -06002562 vfree(info->hdr);
2563}
2564
Rusty Russell2f3238a2012-10-22 18:09:41 +10302565static int rewrite_section_headers(struct load_info *info, int flags)
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002566{
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 Mortonbddb12b2013-11-12 15:11:28 -08002576 pr_err("Module len %lu truncated\n", info->len);
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002577 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 Russell8b5f61a2010-08-05 12:59:06 -06002589 }
Rusty Russelld6df72a2010-08-05 12:59:07 -06002590
2591 /* Track but don't keep modinfo and version sections. */
Rusty Russell2f3238a2012-10-22 18:09:41 +10302592 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 Russell49668682010-08-05 12:59:10 -06002596 info->index.info = find_sec(info, ".modinfo");
Rusty Russelld6df72a2010-08-05 12:59:07 -06002597 info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
2598 info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002599 return 0;
2600}
2601
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002602/*
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 Russell2f3238a2012-10-22 18:09:41 +10302610static struct module *setup_load_info(struct load_info *info, int flags)
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002611{
2612 unsigned int i;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002613 int err;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002614 struct module *mod;
2615
2616 /* Set up the convenience variables */
2617 info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002618 info->secstrings = (void *)info->hdr
2619 + info->sechdrs[info->hdr->e_shstrndx].sh_offset;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002620
Rusty Russell2f3238a2012-10-22 18:09:41 +10302621 err = rewrite_section_headers(info, flags);
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002622 if (err)
2623 return ERR_PTR(err);
2624
2625 /* Find internal symbols and strings. */
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002626 for (i = 1; i < info->hdr->e_shnum; i++) {
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002627 if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
2628 info->index.sym = i;
2629 info->index.str = info->sechdrs[i].sh_link;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002630 info->strtab = (char *)info->hdr
2631 + info->sechdrs[info->index.str].sh_offset;
2632 break;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002633 }
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002634 }
2635
Rusty Russell49668682010-08-05 12:59:10 -06002636 info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002637 if (!info->index.mod) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002638 pr_warn("No module found in object\n");
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002639 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 Mortonbddb12b2013-11-12 15:11:28 -08002645 pr_warn("%s: module has no symbols (stripped?)\n", mod->name);
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002646 return ERR_PTR(-ENOEXEC);
2647 }
2648
Rusty Russell49668682010-08-05 12:59:10 -06002649 info->index.pcpu = find_pcpusec(info);
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002650
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002651 /* 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 Torvalds3264d3f2010-06-02 11:01:06 -07002656}
2657
Rusty Russell2f3238a2012-10-22 18:09:41 +10302658static int check_modinfo(struct module *mod, struct load_info *info, int flags)
Rusty Russell40dd2562010-08-05 12:59:03 -06002659{
Rusty Russell49668682010-08-05 12:59:10 -06002660 const char *modmagic = get_modinfo(info, "vermagic");
Rusty Russell40dd2562010-08-05 12:59:03 -06002661 int err;
2662
Rusty Russell2f3238a2012-10-22 18:09:41 +10302663 if (flags & MODULE_INIT_IGNORE_VERMAGIC)
2664 modmagic = NULL;
2665
Rusty Russell40dd2562010-08-05 12:59:03 -06002666 /* 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 Russell49668682010-08-05 12:59:10 -06002671 } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002672 pr_err("%s: version magic '%s' should be '%s'\n",
Rusty Russell40dd2562010-08-05 12:59:03 -06002673 mod->name, modmagic, vermagic);
2674 return -ENOEXEC;
2675 }
2676
Ben Hutchings2449b8b2011-10-24 15:12:28 +02002677 if (!get_modinfo(info, "intree"))
Rusty Russell373d4d02013-01-21 17:17:39 +10302678 add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK);
Ben Hutchings2449b8b2011-10-24 15:12:28 +02002679
Rusty Russell49668682010-08-05 12:59:10 -06002680 if (get_modinfo(info, "staging")) {
Rusty Russell373d4d02013-01-21 17:17:39 +10302681 add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK);
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002682 pr_warn("%s: module is from the staging directory, the quality "
2683 "is unknown, you have been warned.\n", mod->name);
Rusty Russell40dd2562010-08-05 12:59:03 -06002684 }
Rusty Russell22e268e2010-08-05 12:59:05 -06002685
2686 /* Set up license info based on the info section */
Rusty Russell49668682010-08-05 12:59:10 -06002687 set_license(mod, get_modinfo(info, "license"));
Rusty Russell22e268e2010-08-05 12:59:05 -06002688
Rusty Russell40dd2562010-08-05 12:59:03 -06002689 return 0;
2690}
2691
Frantisek Hrbataeb3057d2013-10-14 18:08:46 +10302692static int find_module_sections(struct module *mod, struct load_info *info)
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002693{
Rusty Russell49668682010-08-05 12:59:10 -06002694 mod->kp = section_objs(info, "__param",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002695 sizeof(*mod->kp), &mod->num_kp);
Rusty Russell49668682010-08-05 12:59:10 -06002696 mod->syms = section_objs(info, "__ksymtab",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002697 sizeof(*mod->syms), &mod->num_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002698 mod->crcs = section_addr(info, "__kcrctab");
2699 mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002700 sizeof(*mod->gpl_syms),
2701 &mod->num_gpl_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002702 mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
2703 mod->gpl_future_syms = section_objs(info,
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002704 "__ksymtab_gpl_future",
2705 sizeof(*mod->gpl_future_syms),
2706 &mod->num_gpl_future_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002707 mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002708
2709#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russell49668682010-08-05 12:59:10 -06002710 mod->unused_syms = section_objs(info, "__ksymtab_unused",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002711 sizeof(*mod->unused_syms),
2712 &mod->num_unused_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002713 mod->unused_crcs = section_addr(info, "__kcrctab_unused");
2714 mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002715 sizeof(*mod->unused_gpl_syms),
2716 &mod->num_unused_gpl_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002717 mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002718#endif
2719#ifdef CONFIG_CONSTRUCTORS
Rusty Russell49668682010-08-05 12:59:10 -06002720 mod->ctors = section_objs(info, ".ctors",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002721 sizeof(*mod->ctors), &mod->num_ctors);
Frantisek Hrbataeb3057d2013-10-14 18:08:46 +10302722 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 Torvaldsf91a13b2010-08-05 12:59:02 -06002734#endif
2735
2736#ifdef CONFIG_TRACEPOINTS
Mathieu Desnoyers65498642011-01-26 17:26:22 -05002737 mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
2738 sizeof(*mod->tracepoints_ptrs),
2739 &mod->num_tracepoints);
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002740#endif
Jason Baronbf5438fc2010-09-17 11:09:00 -04002741#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 Torvaldsf91a13b2010-08-05 12:59:02 -06002746#ifdef CONFIG_EVENT_TRACING
Rusty Russell49668682010-08-05 12:59:10 -06002747 mod->trace_events = section_objs(info, "_ftrace_events",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002748 sizeof(*mod->trace_events),
2749 &mod->num_trace_events);
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002750#endif
Steven Rostedt13b9b6e2010-11-10 22:19:24 -05002751#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 Rostedt13b9b6e2010-11-10 22:19:24 -05002755#endif
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002756#ifdef CONFIG_FTRACE_MCOUNT_RECORD
2757 /* sechdrs[0].sh_size is always zero */
Rusty Russell49668682010-08-05 12:59:10 -06002758 mod->ftrace_callsites = section_objs(info, "__mcount_loc",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002759 sizeof(*mod->ftrace_callsites),
2760 &mod->num_ftrace_callsites);
2761#endif
Rusty Russell22e268e2010-08-05 12:59:05 -06002762
Rusty Russell811d66a2010-08-05 12:59:12 -06002763 mod->extable = section_objs(info, "__ex_table",
2764 sizeof(*mod->extable), &mod->num_exentries);
2765
Rusty Russell49668682010-08-05 12:59:10 -06002766 if (section_addr(info, "__obsparm"))
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002767 pr_warn("%s: Ignoring obsolete parameters\n", mod->name);
Rusty Russell811d66a2010-08-05 12:59:12 -06002768
2769 info->debug = section_objs(info, "__verbose",
2770 sizeof(*info->debug), &info->num_debug);
Frantisek Hrbataeb3057d2013-10-14 18:08:46 +10302771
2772 return 0;
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002773}
2774
Rusty Russell49668682010-08-05 12:59:10 -06002775static int move_module(struct module *mod, struct load_info *info)
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002776{
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 Russelld9131882010-08-05 12:59:08 -06002789 return -ENOMEM;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002790
2791 memset(ptr, 0, mod->core_size);
2792 mod->module_core = ptr;
2793
Rusty Russell82fab442012-12-11 09:38:33 +10302794 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 Torvalds65b8a9b2010-08-05 12:59:02 -06002811
2812 /* Transfer each section which specifies SHF_ALLOC */
Jim Cromie5e124162011-12-06 12:11:31 -07002813 pr_debug("final section addresses:\n");
Rusty Russell49668682010-08-05 12:59:10 -06002814 for (i = 0; i < info->hdr->e_shnum; i++) {
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002815 void *dest;
Rusty Russell49668682010-08-05 12:59:10 -06002816 Elf_Shdr *shdr = &info->sechdrs[i];
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002817
Rusty Russell49668682010-08-05 12:59:10 -06002818 if (!(shdr->sh_flags & SHF_ALLOC))
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002819 continue;
2820
Rusty Russell49668682010-08-05 12:59:10 -06002821 if (shdr->sh_entsize & INIT_OFFSET_MASK)
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002822 dest = mod->module_init
Rusty Russell49668682010-08-05 12:59:10 -06002823 + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002824 else
Rusty Russell49668682010-08-05 12:59:10 -06002825 dest = mod->module_core + shdr->sh_entsize;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002826
Rusty Russell49668682010-08-05 12:59:10 -06002827 if (shdr->sh_type != SHT_NOBITS)
2828 memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002829 /* Update sh_addr to point to copy in image. */
Rusty Russell49668682010-08-05 12:59:10 -06002830 shdr->sh_addr = (unsigned long)dest;
Jim Cromie5e124162011-12-06 12:11:31 -07002831 pr_debug("\t0x%lx %s\n",
2832 (long)shdr->sh_addr, info->secstrings + shdr->sh_name);
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002833 }
Rusty Russelld9131882010-08-05 12:59:08 -06002834
2835 return 0;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002836}
2837
Rusty Russell49668682010-08-05 12:59:10 -06002838static int check_module_license_and_versions(struct module *mod)
Rusty Russell22e268e2010-08-05 12:59:05 -06002839{
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 Russell373d4d02013-01-21 17:17:39 +10302846 add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE);
Rusty Russell22e268e2010-08-05 12:59:05 -06002847
2848 /* driverloader was caught wrongly pretending to be under GPL */
2849 if (strcmp(mod->name, "driverloader") == 0)
Rusty Russell373d4d02013-01-21 17:17:39 +10302850 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2851 LOCKDEP_NOW_UNRELIABLE);
Rusty Russell22e268e2010-08-05 12:59:05 -06002852
Matthew Garrettc99af372012-06-22 13:49:31 -04002853 /* lve claims to be GPL but upstream won't provide source */
2854 if (strcmp(mod->name, "lve") == 0)
Rusty Russell373d4d02013-01-21 17:17:39 +10302855 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2856 LOCKDEP_NOW_UNRELIABLE);
Matthew Garrettc99af372012-06-22 13:49:31 -04002857
Rusty Russell22e268e2010-08-05 12:59:05 -06002858#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
2874static 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 Bonn74e08fc2011-06-30 21:22:11 +02002897int __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 Russell2f3238a2012-10-22 18:09:41 +10302905static struct module *layout_and_allocate(struct load_info *info, int flags)
Rusty Russelld9131882010-08-05 12:59:08 -06002906{
2907 /* Module within temporary copy. */
2908 struct module *mod;
2909 int err;
2910
Rusty Russell2f3238a2012-10-22 18:09:41 +10302911 mod = setup_load_info(info, flags);
Rusty Russelld9131882010-08-05 12:59:08 -06002912 if (IS_ERR(mod))
2913 return mod;
2914
Rusty Russell2f3238a2012-10-22 18:09:41 +10302915 err = check_modinfo(mod, info, flags);
Rusty Russelld9131882010-08-05 12:59:08 -06002916 if (err)
2917 return ERR_PTR(err);
2918
2919 /* Allow arches to frob section contents and sizes. */
Rusty Russell49668682010-08-05 12:59:10 -06002920 err = module_frob_arch_sections(info->hdr, info->sechdrs,
2921 info->secstrings, mod);
Rusty Russelld9131882010-08-05 12:59:08 -06002922 if (err < 0)
Rusty Russell8d8022e2013-07-03 10:06:28 +09302923 return ERR_PTR(err);
Rusty Russelld9131882010-08-05 12:59:08 -06002924
Rusty Russell8d8022e2013-07-03 10:06:28 +09302925 /* We will do a special allocation for per-cpu sections later. */
2926 info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC;
Rusty Russelld9131882010-08-05 12:59:08 -06002927
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 Russell49668682010-08-05 12:59:10 -06002931 layout_sections(mod, info);
Rusty Russell49668682010-08-05 12:59:10 -06002932 layout_symtab(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002933
2934 /* Allocate and move to the final place */
Rusty Russell49668682010-08-05 12:59:10 -06002935 err = move_module(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002936 if (err)
Rusty Russell8d8022e2013-07-03 10:06:28 +09302937 return ERR_PTR(err);
Rusty Russelld9131882010-08-05 12:59:08 -06002938
2939 /* Module has been copied to its final place now: return it. */
2940 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
Rusty Russell49668682010-08-05 12:59:10 -06002941 kmemleak_load_module(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002942 return mod;
Rusty Russelld9131882010-08-05 12:59:08 -06002943}
2944
2945/* mod is no longer valid after this! */
2946static void module_deallocate(struct module *mod, struct load_info *info)
2947{
Rusty Russelld9131882010-08-05 12:59:08 -06002948 percpu_modfree(mod);
2949 module_free(mod, mod->module_init);
2950 module_free(mod, mod->module_core);
2951}
2952
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002953int __weak module_finalize(const Elf_Ehdr *hdr,
2954 const Elf_Shdr *sechdrs,
2955 struct module *me)
2956{
2957 return 0;
2958}
2959
Rusty Russell811d66a2010-08-05 12:59:12 -06002960static int post_relocation(struct module *mod, const struct load_info *info)
2961{
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002962 /* Sort exception table now relocations are done. */
Rusty Russell811d66a2010-08-05 12:59:12 -06002963 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 Russell51f3d0f2010-08-05 12:59:13 -06002969 /* Setup kallsyms-specific fields. */
Rusty Russell811d66a2010-08-05 12:59:12 -06002970 add_kallsyms(mod, info);
2971
2972 /* Arch-specific module finalizing. */
2973 return module_finalize(info->hdr, info->sechdrs, mod);
2974}
2975
Rusty Russell9bb9c3b2012-09-28 14:31:03 +09302976/* Is this module of this name done loading? No locks held. */
2977static bool finished_loading(const char *name)
2978{
2979 struct module *mod;
2980 bool ret;
2981
2982 mutex_lock(&module_mutex);
Mathias Krause4f6de4d2013-07-02 15:35:11 +09302983 mod = find_module_all(name, strlen(name), true);
Rusty Russell0d21b0e2013-01-12 11:38:44 +10302984 ret = !mod || mod->state == MODULE_STATE_LIVE
2985 || mod->state == MODULE_STATE_GOING;
Rusty Russell9bb9c3b2012-09-28 14:31:03 +09302986 mutex_unlock(&module_mutex);
2987
2988 return ret;
2989}
2990
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07002991/* Call module constructors. */
2992static 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 Torvalds1da177e2005-04-16 15:20:36 -07003002/* This is where the real work happens */
Kees Cook34e11692012-10-16 07:31:07 +10303003static int do_init_module(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003004{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003005 int ret = 0;
3006
Tejun Heo774a1222013-01-15 18:52:51 -08003007 /*
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 Oberparleiterb99b87f2009-06-17 16:28:03 -07003013 do_mod_ctors(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003014 /* Start the module */
3015 if (mod->init != NULL)
Arjan van de Ven59f94152008-07-30 12:49:02 -07003016 ret = do_one_initcall(mod->init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003017 if (ret < 0) {
3018 /* Init routine failed: abort. Try to protect us from
3019 buggy refcounters. */
3020 mod->state = MODULE_STATE_GOING;
Paul E. McKenneyfbd568a3e2005-05-01 08:59:04 -07003021 synchronize_sched();
Rusty Russellaf49d922007-10-16 23:26:27 -07003022 module_put(mod);
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +02003023 blocking_notifier_call_chain(&module_notify_list,
3024 MODULE_STATE_GOING, mod);
Rusty Russellaf49d922007-10-16 23:26:27 -07003025 free_module(mod);
Rusty Russell6f139092012-09-28 14:31:03 +09303026 wake_up_all(&module_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003027 return ret;
3028 }
Alexey Dobriyane24e2e62008-03-10 11:43:53 -07003029 if (ret > 0) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08003030 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 Dobriyane24e2e62008-03-10 11:43:53 -07003034 dump_stack();
3035 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003036
Rusty Russell6f139092012-09-28 14:31:03 +09303037 /* Now it's a first class citizen! */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003038 mod->state = MODULE_STATE_LIVE;
Masami Hiramatsu0deddf432009-01-06 14:41:54 -08003039 blocking_notifier_call_chain(&module_notify_list,
3040 MODULE_STATE_LIVE, mod);
Rusty Russell6c5db222008-03-10 11:43:52 -07003041
Tejun Heo774a1222013-01-15 18:52:51 -08003042 /*
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 Torvaldsd6de2c82009-04-10 12:17:41 -07003061
Rusty Russell6c5db222008-03-10 11:43:52 -07003062 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003063 /* Drop initial reference. */
3064 module_put(mod);
Rusty Russellad6561d2009-06-12 21:47:03 -06003065 trim_init_extable(mod);
Jan Beulich4a496222009-07-06 14:50:42 +01003066#ifdef CONFIG_KALLSYMS
3067 mod->num_symtab = mod->core_num_syms;
3068 mod->symtab = mod->core_symtab;
Jan Beulich554bdfe2009-07-06 14:51:44 +01003069 mod->strtab = mod->core_strtab;
Jan Beulich4a496222009-07-06 14:50:42 +01003070#endif
Jan Glauber01526ed2011-05-19 16:55:26 -06003071 unset_module_init_ro_nx(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003072 module_free(mod, mod->module_init);
3073 mod->module_init = NULL;
3074 mod->init_size = 0;
Jan Glauber4d103802011-05-19 16:55:25 -06003075 mod->init_ro_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003076 mod->init_text_size = 0;
Ashutosh Naik6389a382006-03-23 03:00:46 -08003077 mutex_unlock(&module_mutex);
Rusty Russell6f139092012-09-28 14:31:03 +09303078 wake_up_all(&module_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003079
3080 return 0;
3081}
3082
Kees Cook34e11692012-10-16 07:31:07 +10303083static int may_init_module(void)
3084{
3085 if (!capable(CAP_SYS_MODULE) || modules_disabled)
3086 return -EPERM;
3087
3088 return 0;
3089}
3090
Rusty Russella3535c72013-01-21 17:18:59 +10303091/*
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 */
3096static int add_unformed_module(struct module *mod)
3097{
3098 int err;
3099 struct module *old;
3100
3101 mod->state = MODULE_STATE_UNFORMED;
3102
3103again:
3104 mutex_lock(&module_mutex);
Mathias Krause4f6de4d2013-07-02 15:35:11 +09303105 old = find_module_all(mod->name, strlen(mod->name), true);
3106 if (old != NULL) {
Rusty Russella3535c72013-01-21 17:18:59 +10303107 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
3123out:
3124 mutex_unlock(&module_mutex);
3125out_unlocked:
3126 return err;
3127}
3128
3129static 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 Russell49822232014-05-14 10:54:19 +09303143 /* 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 Russella3535c72013-01-21 17:18:59 +10303155 /* 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 Russell49822232014-05-14 10:54:19 +09303158 mutex_unlock(&module_mutex);
3159
3160 blocking_notifier_call_chain(&module_notify_list,
3161 MODULE_STATE_COMING, mod);
3162 return 0;
Rusty Russella3535c72013-01-21 17:18:59 +10303163
3164out:
3165 mutex_unlock(&module_mutex);
3166 return err;
3167}
3168
Rusty Russell54041d82013-07-02 15:35:12 +09303169static 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 Mortonbddb12b2013-11-12 15:11:28 -08003173 if (ret != 0)
3174 pr_warn("%s: unknown parameter '%s' ignored\n", modname, param);
Rusty Russell54041d82013-07-02 15:35:12 +09303175 return 0;
3176}
3177
Kees Cook34e11692012-10-16 07:31:07 +10303178/* Allocate and load the module: note that size of section 0 is always
3179 zero, and we rely on this for optional sections. */
Rusty Russell2f3238a2012-10-22 18:09:41 +10303180static int load_module(struct load_info *info, const char __user *uargs,
3181 int flags)
Kees Cook34e11692012-10-16 07:31:07 +10303182{
Rusty Russella3535c72013-01-21 17:18:59 +10303183 struct module *mod;
Kees Cook34e11692012-10-16 07:31:07 +10303184 long err;
Rusty Russell51e158c2014-04-28 11:34:33 +09303185 char *after_dashes;
Kees Cook34e11692012-10-16 07:31:07 +10303186
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 Russell2f3238a2012-10-22 18:09:41 +10303196 mod = layout_and_allocate(info, flags);
Kees Cook34e11692012-10-16 07:31:07 +10303197 if (IS_ERR(mod)) {
3198 err = PTR_ERR(mod);
3199 goto free_copy;
3200 }
3201
Rusty Russella3535c72013-01-21 17:18:59 +10303202 /* Reserve our place in the list. */
3203 err = add_unformed_module(mod);
3204 if (err)
Rusty Russell1fb93412013-01-12 13:27:34 +10303205 goto free_module;
Rusty Russell1fb93412013-01-12 13:27:34 +10303206
Kees Cook34e11692012-10-16 07:31:07 +10303207#ifdef CONFIG_MODULE_SIG
3208 mod->sig_ok = info->sig_ok;
Rusty Russell64748a22013-01-21 17:03:02 +10303209 if (!mod->sig_ok) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08003210 pr_notice_once("%s: module verification failed: signature "
3211 "and/or required key missing - tainting "
3212 "kernel\n", mod->name);
Mathieu Desnoyers66cc69e2014-03-13 12:11:30 +10303213 add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK);
Rusty Russell64748a22013-01-21 17:03:02 +10303214 }
Kees Cook34e11692012-10-16 07:31:07 +10303215#endif
3216
Rusty Russell8d8022e2013-07-03 10:06:28 +09303217 /* To avoid stressing percpu allocator, do this once we're unique. */
Rusty Russell9eb76d72013-07-03 10:06:29 +09303218 err = percpu_modalloc(mod, info);
Rusty Russell8d8022e2013-07-03 10:06:28 +09303219 if (err)
3220 goto unlink_mod;
3221
Kees Cook34e11692012-10-16 07:31:07 +10303222 /* Now module is in final location, initialize linked lists, etc. */
3223 err = module_unload_init(mod);
3224 if (err)
Rusty Russell1fb93412013-01-12 13:27:34 +10303225 goto unlink_mod;
Kees Cook34e11692012-10-16 07:31:07 +10303226
3227 /* Now we've got everything in the final locations, we can
3228 * find optional sections. */
Frantisek Hrbataeb3057d2013-10-14 18:08:46 +10303229 err = find_module_sections(mod, info);
3230 if (err)
3231 goto free_unload;
Kees Cook34e11692012-10-16 07:31:07 +10303232
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 Cook34e11692012-10-16 07:31:07 +10303262 dynamic_debug_setup(info->debug, info->num_debug);
3263
Steven Rostedt (Red Hat)a949ae52014-04-24 10:40:12 -04003264 /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
3265 ftrace_module_init(mod);
3266
Rusty Russella3535c72013-01-21 17:18:59 +10303267 /* Finally it's fully formed, ready to start executing. */
3268 err = complete_formation(mod, info);
3269 if (err)
Rusty Russell1fb93412013-01-12 13:27:34 +10303270 goto ddebug_cleanup;
Kees Cook34e11692012-10-16 07:31:07 +10303271
Kees Cook34e11692012-10-16 07:31:07 +10303272 /* Module is ready to execute: parsing args may do that. */
Rusty Russell51e158c2014-04-28 11:34:33 +09303273 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 Russell1fb93412013-01-12 13:27:34 +10303277 goto bug_cleanup;
Rusty Russell51e158c2014-04-28 11:34:33 +09303278 } else if (after_dashes) {
3279 pr_warn("%s: parameters '%s' after `--' ignored\n",
3280 mod->name, after_dashes);
3281 }
Kees Cook34e11692012-10-16 07:31:07 +10303282
3283 /* Link in to syfs. */
3284 err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp);
3285 if (err < 0)
Rusty Russell1fb93412013-01-12 13:27:34 +10303286 goto bug_cleanup;
Kees Cook34e11692012-10-16 07:31:07 +10303287
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 Russell1fb93412013-01-12 13:27:34 +10303296 bug_cleanup:
3297 /* module_bug_cleanup needs module_mutex protection */
Kees Cook34e11692012-10-16 07:31:07 +10303298 mutex_lock(&module_mutex);
Kees Cook34e11692012-10-16 07:31:07 +10303299 module_bug_cleanup(mod);
Linus Torvaldsee61abb2013-01-20 20:22:58 -08003300 mutex_unlock(&module_mutex);
Andy Lutomirskiff7e0052014-08-16 04:13:37 +09303301
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 Russella3535c72013-01-21 17:18:59 +10303306 ddebug_cleanup:
Rusty Russell1fb93412013-01-12 13:27:34 +10303307 dynamic_debug_remove(info->debug);
Kees Cook34e11692012-10-16 07:31:07 +10303308 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 Russell1fb93412013-01-12 13:27:34 +10303316 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 Hiramatsu4f487952014-11-10 09:26:29 +10303321 /* Wait for RCU synchronizing before releasing mod->list. */
3322 synchronize_rcu();
Rusty Russell1fb93412013-01-12 13:27:34 +10303323 mutex_unlock(&module_mutex);
Kees Cook34e11692012-10-16 07:31:07 +10303324 free_module:
3325 module_deallocate(mod, info);
3326 free_copy:
3327 free_copy(info);
3328 return err;
3329}
3330
3331SYSCALL_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 Russell2f3238a2012-10-22 18:09:41 +10303348 return load_module(&info, uargs, 0);
Kees Cook34e11692012-10-16 07:31:07 +10303349}
3350
Rusty Russell2f3238a2012-10-22 18:09:41 +10303351SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
Kees Cook34e11692012-10-16 07:31:07 +10303352{
3353 int err;
3354 struct load_info info = { };
3355
3356 err = may_init_module();
3357 if (err)
3358 return err;
3359
Rusty Russell2f3238a2012-10-22 18:09:41 +10303360 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 Cook34e11692012-10-16 07:31:07 +10303365
3366 err = copy_module_from_fd(fd, &info);
3367 if (err)
3368 return err;
3369
Rusty Russell2f3238a2012-10-22 18:09:41 +10303370 return load_module(&info, uargs, flags);
Kees Cook34e11692012-10-16 07:31:07 +10303371}
3372
Linus Torvalds1da177e2005-04-16 15:20:36 -07003373static 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 $d.
3382 */
3383static inline int is_arm_mapping_symbol(const char *str)
3384{
Russell King2e3a10a2014-07-27 07:29:01 +09303385 if (str[0] == '.' && str[1] == 'L')
3386 return true;
Kyle McMartin6c34f1f2014-09-16 22:37:18 +01003387 return str[0] == '$' && strchr("axtd", str[1])
Linus Torvalds1da177e2005-04-16 15:20:36 -07003388 && (str[2] == '\0' || str[2] == '.');
3389}
3390
3391static 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 Hiramatsua06f6212009-01-06 14:41:49 -08003400 if (within_module_init(addr, mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003401 nextval = (unsigned long)mod->module_init+mod->init_text_size;
Daniel Walker22a8bde2007-10-18 03:06:07 -07003402 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07003403 nextval = (unsigned long)mod->module_core+mod->core_text_size;
3404
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003405 /* Scan for closest preceding symbol, and next symbol. (ELF
Daniel Walker22a8bde2007-10-18 03:06:07 -07003406 starts real symbols at 1). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003407 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 Dobriyanffb45122007-05-08 00:28:41 -07003428 if (size)
3429 *size = nextval - mod->symtab[best].st_value;
3430 if (offset)
3431 *offset = addr - mod->symtab[best].st_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003432 return mod->strtab + mod->symtab[best].st_name;
3433}
3434
Rusty Russell6dd06c92008-01-29 17:13:22 -05003435/* 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 Morton92dfc9d2008-02-08 04:18:43 -08003437const char *module_address_lookup(unsigned long addr,
Rusty Russell6dd06c92008-01-29 17:13:22 -05003438 unsigned long *size,
3439 unsigned long *offset,
3440 char **modname,
3441 char *namebuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003442{
3443 struct module *mod;
Rusty Russellcb2a5202008-01-14 00:55:03 -08003444 const char *ret = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003445
Rusty Russellcb2a5202008-01-14 00:55:03 -08003446 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003447 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303448 if (mod->state == MODULE_STATE_UNFORMED)
3449 continue;
Petr Mladek9b20a352014-07-27 07:24:01 +09303450 if (within_module(addr, mod)) {
Franck Bui-Huuffc50892006-10-03 01:13:48 -07003451 if (modname)
3452 *modname = mod->name;
Rusty Russellcb2a5202008-01-14 00:55:03 -08003453 ret = get_ksymbol(mod, addr, size, offset);
3454 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003455 }
3456 }
Rusty Russell6dd06c92008-01-29 17:13:22 -05003457 /* 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 Russellcb2a5202008-01-14 00:55:03 -08003462 preempt_enable();
Andrew Morton92dfc9d2008-02-08 04:18:43 -08003463 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003464}
3465
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003466int lookup_module_symbol_name(unsigned long addr, char *symname)
3467{
3468 struct module *mod;
3469
Rusty Russellcb2a5202008-01-14 00:55:03 -08003470 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003471 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303472 if (mod->state == MODULE_STATE_UNFORMED)
3473 continue;
Petr Mladek9b20a352014-07-27 07:24:01 +09303474 if (within_module(addr, mod)) {
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003475 const char *sym;
3476
3477 sym = get_ksymbol(mod, addr, NULL, NULL);
3478 if (!sym)
3479 goto out;
Tejun Heo9281ace2007-07-17 04:03:51 -07003480 strlcpy(symname, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08003481 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003482 return 0;
3483 }
3484 }
3485out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08003486 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003487 return -ERANGE;
3488}
3489
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003490int 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 Russellcb2a5202008-01-14 00:55:03 -08003495 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003496 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303497 if (mod->state == MODULE_STATE_UNFORMED)
3498 continue;
Petr Mladek9b20a352014-07-27 07:24:01 +09303499 if (within_module(addr, mod)) {
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003500 const char *sym;
3501
3502 sym = get_ksymbol(mod, addr, size, offset);
3503 if (!sym)
3504 goto out;
3505 if (modname)
Tejun Heo9281ace2007-07-17 04:03:51 -07003506 strlcpy(modname, mod->name, MODULE_NAME_LEN);
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003507 if (name)
Tejun Heo9281ace2007-07-17 04:03:51 -07003508 strlcpy(name, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08003509 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003510 return 0;
3511 }
3512 }
3513out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08003514 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003515 return -ERANGE;
3516}
3517
Alexey Dobriyanea078902007-05-08 00:28:39 -07003518int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
3519 char *name, char *module_name, int *exported)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003520{
3521 struct module *mod;
3522
Rusty Russellcb2a5202008-01-14 00:55:03 -08003523 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003524 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303525 if (mod->state == MODULE_STATE_UNFORMED)
3526 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003527 if (symnum < mod->num_symtab) {
3528 *value = mod->symtab[symnum].st_value;
3529 *type = mod->symtab[symnum].st_info;
Andreas Gruenbacher098c5ee2006-07-14 00:24:04 -07003530 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
Tejun Heo9281ace2007-07-17 04:03:51 -07003531 KSYM_NAME_LEN);
3532 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
Tim Abbottca4787b2009-01-05 08:40:10 -06003533 *exported = is_exported(name, *value, mod);
Rusty Russellcb2a5202008-01-14 00:55:03 -08003534 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07003535 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003536 }
3537 symnum -= mod->num_symtab;
3538 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08003539 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07003540 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003541}
3542
3543static 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 Owens54e8ce42006-02-03 03:03:53 -08003548 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
3549 mod->symtab[i].st_info != 'U')
Linus Torvalds1da177e2005-04-16 15:20:36 -07003550 return mod->symtab[i].st_value;
3551 return 0;
3552}
3553
3554/* Look for this name: can be of form module:name. */
3555unsigned 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 Russellcb2a5202008-01-14 00:55:03 -08003562 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003563 if ((colon = strchr(name, ':')) != NULL) {
Mathias Krause4f6de4d2013-07-02 15:35:11 +09303564 if ((mod = find_module_all(name, colon - name, false)) != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003565 ret = mod_find_symname(mod, colon+1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003566 } else {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303567 list_for_each_entry_rcu(mod, &modules, list) {
3568 if (mod->state == MODULE_STATE_UNFORMED)
3569 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003570 if ((ret = mod_find_symname(mod, name)) != 0)
3571 break;
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303572 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003573 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08003574 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003575 return ret;
3576}
Anders Kaseorg75a66612008-12-05 19:03:58 -05003577
3578int 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 Russell0d21b0e2013-01-12 11:38:44 +10303587 if (mod->state == MODULE_STATE_UNFORMED)
3588 continue;
Anders Kaseorg75a66612008-12-05 19:03:58 -05003589 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 Torvalds1da177e2005-04-16 15:20:36 -07003598#endif /* CONFIG_KALLSYMS */
3599
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003600static char *module_flags(struct module *mod, char *buf)
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003601{
3602 int bx = 0;
3603
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303604 BUG_ON(mod->state == MODULE_STATE_UNFORMED);
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003605 if (mod->taints ||
3606 mod->state == MODULE_STATE_GOING ||
3607 mod->state == MODULE_STATE_COMING) {
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003608 buf[bx++] = '(';
Kay Sieverscca3e702012-01-13 09:32:15 +10303609 bx += module_flags_taint(mod, buf + bx);
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003610 /* 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 Malitafa3ba2e82006-10-11 01:21:48 -07003616 buf[bx++] = ')';
3617 }
3618 buf[bx] = '\0';
3619
3620 return buf;
3621}
3622
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003623#ifdef CONFIG_PROC_FS
3624/* Called by the /proc file system to return a list of modules. */
3625static 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
3631static void *m_next(struct seq_file *m, void *p, loff_t *pos)
3632{
3633 return seq_list_next(p, &modules, pos);
3634}
3635
3636static void m_stop(struct seq_file *m, void *p)
3637{
3638 mutex_unlock(&module_mutex);
3639}
3640
Linus Torvalds1da177e2005-04-16 15:20:36 -07003641static int m_show(struct seq_file *m, void *p)
3642{
3643 struct module *mod = list_entry(p, struct module, list);
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003644 char buf[8];
3645
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303646 /* We always ignore unformed modules. */
3647 if (mod->state == MODULE_STATE_UNFORMED)
3648 return 0;
3649
Denys Vlasenko2f0f2a32008-07-22 19:24:27 -05003650 seq_printf(m, "%s %u",
Linus Torvalds1da177e2005-04-16 15:20:36 -07003651 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 Cook9f36e2c2011-03-22 16:34:22 -07003660 seq_printf(m, " 0x%pK", mod->module_core);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003661
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003662 /* Taints info */
3663 if (mod->taints)
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003664 seq_printf(m, " %s", module_flags(mod, buf));
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003665
Linus Torvalds1da177e2005-04-16 15:20:36 -07003666 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 Dobriyan3b5d5c62008-10-06 13:19:27 +04003675static const struct seq_operations modules_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003676 .start = m_start,
3677 .next = m_next,
3678 .stop = m_stop,
3679 .show = m_show
3680};
3681
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003682static int modules_open(struct inode *inode, struct file *file)
3683{
3684 return seq_open(file, &modules_op);
3685}
3686
3687static 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
3694static int __init proc_modules_init(void)
3695{
3696 proc_create("modules", 0, NULL, &proc_modules_operations);
3697 return 0;
3698}
3699module_init(proc_modules_init);
3700#endif
3701
Linus Torvalds1da177e2005-04-16 15:20:36 -07003702/* Given an address, look for it in the module exception tables. */
3703const struct exception_table_entry *search_module_extables(unsigned long addr)
3704{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003705 const struct exception_table_entry *e = NULL;
3706 struct module *mod;
3707
Rusty Russell24da1cb2007-07-15 23:41:46 -07003708 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003709 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303710 if (mod->state == MODULE_STATE_UNFORMED)
3711 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003712 if (mod->num_exentries == 0)
3713 continue;
Daniel Walker22a8bde2007-10-18 03:06:07 -07003714
Linus Torvalds1da177e2005-04-16 15:20:36 -07003715 e = search_extable(mod->extable,
3716 mod->extable + mod->num_exentries - 1,
3717 addr);
3718 if (e)
3719 break;
3720 }
Rusty Russell24da1cb2007-07-15 23:41:46 -07003721 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003722
3723 /* Now, if we found one, we are running inside it now, hence
Daniel Walker22a8bde2007-10-18 03:06:07 -07003724 we cannot unload the module, hence no refcnt needed. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003725 return e;
3726}
3727
Ingo Molnar4d435f92006-07-03 00:24:24 -07003728/*
Rusty Russelle6104992009-03-31 13:05:31 -06003729 * 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 Molnar4d435f92006-07-03 00:24:24 -07003734 */
Rusty Russelle6104992009-03-31 13:05:31 -06003735bool is_module_address(unsigned long addr)
Ingo Molnar4d435f92006-07-03 00:24:24 -07003736{
Rusty Russelle6104992009-03-31 13:05:31 -06003737 bool ret;
Ingo Molnar4d435f92006-07-03 00:24:24 -07003738
Rusty Russell24da1cb2007-07-15 23:41:46 -07003739 preempt_disable();
Rusty Russelle6104992009-03-31 13:05:31 -06003740 ret = __module_address(addr) != NULL;
Rusty Russell24da1cb2007-07-15 23:41:46 -07003741 preempt_enable();
Ingo Molnar4d435f92006-07-03 00:24:24 -07003742
Rusty Russelle6104992009-03-31 13:05:31 -06003743 return ret;
Ingo Molnar4d435f92006-07-03 00:24:24 -07003744}
3745
Rusty Russelle6104992009-03-31 13:05:31 -06003746/*
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 Torvalds714f83d2009-04-05 11:04:19 -07003753struct module *__module_address(unsigned long addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003754{
3755 struct module *mod;
3756
Rusty Russell3a642e92008-07-22 19:24:28 -05003757 if (addr < module_addr_min || addr > module_addr_max)
3758 return NULL;
3759
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303760 list_for_each_entry_rcu(mod, &modules, list) {
3761 if (mod->state == MODULE_STATE_UNFORMED)
3762 continue;
Petr Mladek9b20a352014-07-27 07:24:01 +09303763 if (within_module(addr, mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003764 return mod;
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303765 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003766 return NULL;
3767}
Tim Abbottc6b37802008-12-05 19:03:59 -05003768EXPORT_SYMBOL_GPL(__module_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003769
Rusty Russelle6104992009-03-31 13:05:31 -06003770/*
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 */
3778bool 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 */
3796struct 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 Abbottc6b37802008-12-05 19:03:59 -05003807EXPORT_SYMBOL_GPL(__module_text_address);
Rusty Russelle6104992009-03-31 13:05:31 -06003808
Linus Torvalds1da177e2005-04-16 15:20:36 -07003809/* Don't grab lock, we're oopsing. */
3810void print_modules(void)
3811{
3812 struct module *mod;
Randy Dunlap2bc2d612006-10-02 02:17:02 -07003813 char buf[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003814
Linus Torvaldsb2311252009-06-16 11:07:14 -07003815 printk(KERN_DEFAULT "Modules linked in:");
Andi Kleend72b3752008-08-30 10:09:00 +02003816 /* Most callers should already have preempt disabled, but make sure */
3817 preempt_disable();
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303818 list_for_each_entry_rcu(mod, &modules, list) {
3819 if (mod->state == MODULE_STATE_UNFORMED)
3820 continue;
Jiri Slaby27bba4d2014-02-03 11:13:13 +10303821 pr_cont(" %s%s", mod->name, module_flags(mod, buf));
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303822 }
Andi Kleend72b3752008-08-30 10:09:00 +02003823 preempt_enable();
Arjan van de Vene14af7e2008-01-25 21:08:33 +01003824 if (last_unloaded_module[0])
Jiri Slaby27bba4d2014-02-03 11:13:13 +10303825 pr_cont(" [last unloaded: %s]", last_unloaded_module);
3826 pr_cont("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003827}
3828
Linus Torvalds1da177e2005-04-16 15:20:36 -07003829#ifdef CONFIG_MODVERSIONS
Rusty Russell8c8ef422009-03-31 13:05:34 -06003830/* Generate the signature for all relevant module structures here.
3831 * If these change, we don't want to try to parse the module. */
3832void module_layout(struct module *mod,
3833 struct modversion_info *ver,
3834 struct kernel_param *kp,
3835 struct kernel_symbol *ks,
Mathieu Desnoyers65498642011-01-26 17:26:22 -05003836 struct tracepoint * const *tp)
Rusty Russell8c8ef422009-03-31 13:05:34 -06003837{
3838}
3839EXPORT_SYMBOL(module_layout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003840#endif