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Arjan van de Venf71d20e2006-06-28 04:26:45 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18*/
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/module.h>
20#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>
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +040024#include <linux/fs.h>
Roland McGrath6d760132007-10-16 23:26:40 -070025#include <linux/sysfs.h>
Randy Dunlap9f158332005-09-13 01:25:16 -070026#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/slab.h>
28#include <linux/vmalloc.h>
29#include <linux/elf.h>
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +040030#include <linux/proc_fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/seq_file.h>
32#include <linux/syscalls.h>
33#include <linux/fcntl.h>
34#include <linux/rcupdate.h>
Randy.Dunlapc59ede72006-01-11 12:17:46 -080035#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/cpu.h>
37#include <linux/moduleparam.h>
38#include <linux/errno.h>
39#include <linux/err.h>
40#include <linux/vermagic.h>
41#include <linux/notifier.h>
Al Virof6a57032006-10-18 01:47:25 -040042#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/stop_machine.h>
44#include <linux/device.h>
Matt Domschc988d2b2005-06-23 22:05:15 -070045#include <linux/string.h>
Arjan van de Ven97d1f152006-03-23 03:00:24 -080046#include <linux/mutex.h>
Andi Kleend72b3752008-08-30 10:09:00 +020047#include <linux/rculist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <asm/cacheflush.h>
Bernd Schmidteb8cdec2009-09-21 17:03:57 -070050#include <asm/mmu_context.h>
Sam Ravnborgb817f6f2006-06-09 21:53:55 +020051#include <linux/license.h>
Christoph Lameter6d762392008-02-08 04:18:42 -080052#include <asm/sections.h>
Mathieu Desnoyers97e1c182008-07-18 12:16:16 -040053#include <linux/tracepoint.h>
Steven Rostedt90d595f2008-08-14 15:45:09 -040054#include <linux/ftrace.h>
Arjan van de Ven22a9d642009-01-07 08:45:46 -080055#include <linux/async.h>
Tejun Heofbf59bc2009-02-20 16:29:08 +090056#include <linux/percpu.h>
Catalin Marinas4f2294b2009-06-11 13:23:20 +010057#include <linux/kmemleak.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Li Zefan7ead8b82009-08-17 16:56:28 +080059#define CREATE_TRACE_POINTS
60#include <trace/events/module.h>
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#if 0
63#define DEBUGP printk
64#else
65#define DEBUGP(fmt , a...)
66#endif
67
68#ifndef ARCH_SHF_SMALL
69#define ARCH_SHF_SMALL 0
70#endif
71
72/* If this is set, the section belongs in the init part of the module */
73#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
74
Rusty Russell75676502010-06-05 11:17:36 -060075/*
76 * Mutex protects:
77 * 1) List of modules (also safely readable with preempt_disable),
78 * 2) module_use links,
79 * 3) module_addr_min/module_addr_max.
Andi Kleend72b3752008-08-30 10:09:00 +020080 * (delete uses stop_machine/add uses RCU list operations). */
Tim Abbottc6b37802008-12-05 19:03:59 -050081DEFINE_MUTEX(module_mutex);
82EXPORT_SYMBOL_GPL(module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083static LIST_HEAD(modules);
Jason Wessel67fc4e02010-05-20 21:04:21 -050084#ifdef CONFIG_KGDB_KDB
85struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
86#endif /* CONFIG_KGDB_KDB */
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Stephen Rothwell19e45292009-04-14 17:27:18 +100089/* Block module loading/unloading? */
90int modules_disabled = 0;
91
Rusty Russellc9a3ba52008-01-29 17:13:18 -050092/* Waiting for a module to finish initializing? */
93static DECLARE_WAIT_QUEUE_HEAD(module_wq);
94
Alan Sterne041c682006-03-27 01:16:30 -080095static BLOCKING_NOTIFIER_HEAD(module_notify_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Rusty Russell75676502010-06-05 11:17:36 -060097/* Bounds of module allocation, for speeding __module_address.
98 * Protected by module_mutex. */
Rusty Russell3a642e92008-07-22 19:24:28 -050099static unsigned long module_addr_min = -1UL, module_addr_max = 0;
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101int register_module_notifier(struct notifier_block * nb)
102{
Alan Sterne041c682006-03-27 01:16:30 -0800103 return blocking_notifier_chain_register(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105EXPORT_SYMBOL(register_module_notifier);
106
107int unregister_module_notifier(struct notifier_block * nb)
108{
Alan Sterne041c682006-03-27 01:16:30 -0800109 return blocking_notifier_chain_unregister(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110}
111EXPORT_SYMBOL(unregister_module_notifier);
112
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -0800113/* We require a truly strong try_module_get(): 0 means failure due to
114 ongoing or failed initialization etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115static inline int strong_try_module_get(struct module *mod)
116{
117 if (mod && mod->state == MODULE_STATE_COMING)
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500118 return -EBUSY;
119 if (try_module_get(mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 return 0;
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500121 else
122 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123}
124
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700125static inline void add_taint_module(struct module *mod, unsigned flag)
126{
127 add_taint(flag);
Andi Kleen25ddbb12008-10-15 22:01:41 -0700128 mod->taints |= (1U << flag);
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700129}
130
Robert P. J. Day02a3e592007-05-09 07:26:28 +0200131/*
132 * A thread that wants to hold a reference to a module only while it
133 * is running can call this to safely exit. nfsd and lockd use this.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 */
135void __module_put_and_exit(struct module *mod, long code)
136{
137 module_put(mod);
138 do_exit(code);
139}
140EXPORT_SYMBOL(__module_put_and_exit);
Daniel Walker22a8bde2007-10-18 03:06:07 -0700141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142/* Find a module section: 0 means not found. */
143static unsigned int find_sec(Elf_Ehdr *hdr,
144 Elf_Shdr *sechdrs,
145 const char *secstrings,
146 const char *name)
147{
148 unsigned int i;
149
150 for (i = 1; i < hdr->e_shnum; i++)
151 /* Alloc bit cleared means "ignore it." */
152 if ((sechdrs[i].sh_flags & SHF_ALLOC)
153 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
154 return i;
155 return 0;
156}
157
Rusty Russell5e458cc2008-10-22 10:00:13 -0500158/* Find a module section, or NULL. */
159static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
160 const char *secstrings, const char *name)
161{
162 /* Section 0 has sh_addr 0. */
163 return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
164}
165
166/* Find a module section, or NULL. Fill in number of "objects" in section. */
167static void *section_objs(Elf_Ehdr *hdr,
168 Elf_Shdr *sechdrs,
169 const char *secstrings,
170 const char *name,
171 size_t object_size,
172 unsigned int *num)
173{
174 unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
175
176 /* Section 0 has sh_addr 0 and sh_size 0. */
177 *num = sechdrs[sec].sh_size / object_size;
178 return (void *)sechdrs[sec].sh_addr;
179}
180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181/* Provided by the linker */
182extern const struct kernel_symbol __start___ksymtab[];
183extern const struct kernel_symbol __stop___ksymtab[];
184extern const struct kernel_symbol __start___ksymtab_gpl[];
185extern const struct kernel_symbol __stop___ksymtab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800186extern const struct kernel_symbol __start___ksymtab_gpl_future[];
187extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188extern const unsigned long __start___kcrctab[];
189extern const unsigned long __start___kcrctab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800190extern const unsigned long __start___kcrctab_gpl_future[];
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500191#ifdef CONFIG_UNUSED_SYMBOLS
192extern const struct kernel_symbol __start___ksymtab_unused[];
193extern const struct kernel_symbol __stop___ksymtab_unused[];
194extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
195extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700196extern const unsigned long __start___kcrctab_unused[];
197extern const unsigned long __start___kcrctab_unused_gpl[];
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500198#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200#ifndef CONFIG_MODVERSIONS
201#define symversion(base, idx) NULL
202#else
Andrew Mortonf83ca9f2006-03-28 01:56:20 -0800203#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204#endif
205
Rusty Russelldafd0942008-07-22 19:24:25 -0500206static bool each_symbol_in_section(const struct symsearch *arr,
207 unsigned int arrsize,
208 struct module *owner,
209 bool (*fn)(const struct symsearch *syms,
210 struct module *owner,
211 unsigned int symnum, void *data),
212 void *data)
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100213{
Rusty Russelldafd0942008-07-22 19:24:25 -0500214 unsigned int i, j;
215
216 for (j = 0; j < arrsize; j++) {
217 for (i = 0; i < arr[j].stop - arr[j].start; i++)
218 if (fn(&arr[j], owner, i, data))
219 return true;
220 }
221
222 return false;
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100223}
224
Rusty Russelldafd0942008-07-22 19:24:25 -0500225/* Returns true as soon as fn returns true, otherwise false. */
Tim Abbottc6b37802008-12-05 19:03:59 -0500226bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
227 unsigned int symnum, void *data), void *data)
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700228{
Rusty Russelldafd0942008-07-22 19:24:25 -0500229 struct module *mod;
Linus Torvalds44032e62010-08-05 12:59:05 -0600230 static const struct symsearch arr[] = {
Rusty Russelldafd0942008-07-22 19:24:25 -0500231 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
232 NOT_GPL_ONLY, false },
233 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
234 __start___kcrctab_gpl,
235 GPL_ONLY, false },
236 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
237 __start___kcrctab_gpl_future,
238 WILL_BE_GPL_ONLY, false },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500239#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500240 { __start___ksymtab_unused, __stop___ksymtab_unused,
241 __start___kcrctab_unused,
242 NOT_GPL_ONLY, true },
243 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
244 __start___kcrctab_unused_gpl,
245 GPL_ONLY, true },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500246#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500247 };
248
249 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
250 return true;
251
Andi Kleend72b3752008-08-30 10:09:00 +0200252 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russelldafd0942008-07-22 19:24:25 -0500253 struct symsearch arr[] = {
254 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
255 NOT_GPL_ONLY, false },
256 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
257 mod->gpl_crcs,
258 GPL_ONLY, false },
259 { mod->gpl_future_syms,
260 mod->gpl_future_syms + mod->num_gpl_future_syms,
261 mod->gpl_future_crcs,
262 WILL_BE_GPL_ONLY, false },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500263#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500264 { mod->unused_syms,
265 mod->unused_syms + mod->num_unused_syms,
266 mod->unused_crcs,
267 NOT_GPL_ONLY, true },
268 { mod->unused_gpl_syms,
269 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
270 mod->unused_gpl_crcs,
271 GPL_ONLY, true },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500272#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500273 };
274
275 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
276 return true;
277 }
278 return false;
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700279}
Tim Abbottc6b37802008-12-05 19:03:59 -0500280EXPORT_SYMBOL_GPL(each_symbol);
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700281
Rusty Russelldafd0942008-07-22 19:24:25 -0500282struct find_symbol_arg {
283 /* Input */
284 const char *name;
285 bool gplok;
286 bool warn;
287
288 /* Output */
289 struct module *owner;
290 const unsigned long *crc;
Tim Abbott414fd312008-12-05 19:03:56 -0500291 const struct kernel_symbol *sym;
Rusty Russelldafd0942008-07-22 19:24:25 -0500292};
293
294static bool find_symbol_in_section(const struct symsearch *syms,
295 struct module *owner,
296 unsigned int symnum, void *data)
Rusty Russellad9546c2008-05-01 21:14:59 -0500297{
Rusty Russelldafd0942008-07-22 19:24:25 -0500298 struct find_symbol_arg *fsa = data;
299
300 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
301 return false;
302
303 if (!fsa->gplok) {
304 if (syms->licence == GPL_ONLY)
305 return false;
306 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
307 printk(KERN_WARNING "Symbol %s is being used "
308 "by a non-GPL module, which will not "
309 "be allowed in the future\n", fsa->name);
310 printk(KERN_WARNING "Please see the file "
311 "Documentation/feature-removal-schedule.txt "
312 "in the kernel source tree for more details.\n");
313 }
314 }
315
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500316#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500317 if (syms->unused && fsa->warn) {
Rusty Russellad9546c2008-05-01 21:14:59 -0500318 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
Rusty Russelldafd0942008-07-22 19:24:25 -0500319 "however this module is using it.\n", fsa->name);
Rusty Russellad9546c2008-05-01 21:14:59 -0500320 printk(KERN_WARNING
321 "This symbol will go away in the future.\n");
322 printk(KERN_WARNING
323 "Please evalute if this is the right api to use and if "
324 "it really is, submit a report the linux kernel "
325 "mailinglist together with submitting your code for "
326 "inclusion.\n");
327 }
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500328#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500329
330 fsa->owner = owner;
331 fsa->crc = symversion(syms->crcs, symnum);
Tim Abbott414fd312008-12-05 19:03:56 -0500332 fsa->sym = &syms->start[symnum];
Rusty Russellad9546c2008-05-01 21:14:59 -0500333 return true;
334}
335
Tim Abbott414fd312008-12-05 19:03:56 -0500336/* Find a symbol and return it, along with, (optional) crc and
Rusty Russell75676502010-06-05 11:17:36 -0600337 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
Tim Abbottc6b37802008-12-05 19:03:59 -0500338const struct kernel_symbol *find_symbol(const char *name,
339 struct module **owner,
340 const unsigned long **crc,
341 bool gplok,
342 bool warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
Rusty Russelldafd0942008-07-22 19:24:25 -0500344 struct find_symbol_arg fsa;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Rusty Russelldafd0942008-07-22 19:24:25 -0500346 fsa.name = name;
347 fsa.gplok = gplok;
348 fsa.warn = warn;
349
350 if (each_symbol(find_symbol_in_section, &fsa)) {
Rusty Russellad9546c2008-05-01 21:14:59 -0500351 if (owner)
Rusty Russelldafd0942008-07-22 19:24:25 -0500352 *owner = fsa.owner;
353 if (crc)
354 *crc = fsa.crc;
Tim Abbott414fd312008-12-05 19:03:56 -0500355 return fsa.sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 }
Rusty Russellad9546c2008-05-01 21:14:59 -0500357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 DEBUGP("Failed to find symbol %s\n", name);
Tim Abbott414fd312008-12-05 19:03:56 -0500359 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360}
Tim Abbottc6b37802008-12-05 19:03:59 -0500361EXPORT_SYMBOL_GPL(find_symbol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363/* Search for module by name: must hold module_mutex. */
Tim Abbottc6b37802008-12-05 19:03:59 -0500364struct module *find_module(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365{
366 struct module *mod;
367
368 list_for_each_entry(mod, &modules, list) {
369 if (strcmp(mod->name, name) == 0)
370 return mod;
371 }
372 return NULL;
373}
Tim Abbottc6b37802008-12-05 19:03:59 -0500374EXPORT_SYMBOL_GPL(find_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
376#ifdef CONFIG_SMP
Tejun Heofbf59bc2009-02-20 16:29:08 +0900377
Tejun Heo259354d2010-03-10 18:56:10 +0900378static inline void __percpu *mod_percpu(struct module *mod)
Tejun Heofbf59bc2009-02-20 16:29:08 +0900379{
Tejun Heo259354d2010-03-10 18:56:10 +0900380 return mod->percpu;
381}
Tejun Heofbf59bc2009-02-20 16:29:08 +0900382
Tejun Heo259354d2010-03-10 18:56:10 +0900383static int percpu_modalloc(struct module *mod,
384 unsigned long size, unsigned long align)
385{
Tejun Heofbf59bc2009-02-20 16:29:08 +0900386 if (align > PAGE_SIZE) {
387 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
Tejun Heo259354d2010-03-10 18:56:10 +0900388 mod->name, align, PAGE_SIZE);
Tejun Heofbf59bc2009-02-20 16:29:08 +0900389 align = PAGE_SIZE;
390 }
391
Tejun Heo259354d2010-03-10 18:56:10 +0900392 mod->percpu = __alloc_reserved_percpu(size, align);
393 if (!mod->percpu) {
Tejun Heofbf59bc2009-02-20 16:29:08 +0900394 printk(KERN_WARNING
395 "Could not allocate %lu bytes percpu data\n", size);
Tejun Heo259354d2010-03-10 18:56:10 +0900396 return -ENOMEM;
397 }
398 mod->percpu_size = size;
399 return 0;
Tejun Heofbf59bc2009-02-20 16:29:08 +0900400}
401
Tejun Heo259354d2010-03-10 18:56:10 +0900402static void percpu_modfree(struct module *mod)
Tejun Heofbf59bc2009-02-20 16:29:08 +0900403{
Tejun Heo259354d2010-03-10 18:56:10 +0900404 free_percpu(mod->percpu);
Tejun Heofbf59bc2009-02-20 16:29:08 +0900405}
406
Tejun Heo6b588c12009-02-20 16:29:07 +0900407static unsigned int find_pcpusec(Elf_Ehdr *hdr,
408 Elf_Shdr *sechdrs,
409 const char *secstrings)
410{
Denys Vlasenko3d9a8542010-02-20 01:03:43 +0100411 return find_sec(hdr, sechdrs, secstrings, ".data..percpu");
Tejun Heo6b588c12009-02-20 16:29:07 +0900412}
413
Tejun Heo259354d2010-03-10 18:56:10 +0900414static void percpu_modcopy(struct module *mod,
415 const void *from, unsigned long size)
Tejun Heo6b588c12009-02-20 16:29:07 +0900416{
417 int cpu;
418
419 for_each_possible_cpu(cpu)
Tejun Heo259354d2010-03-10 18:56:10 +0900420 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
Tejun Heo6b588c12009-02-20 16:29:07 +0900421}
422
Tejun Heo10fad5e2010-03-10 18:57:54 +0900423/**
424 * is_module_percpu_address - test whether address is from module static percpu
425 * @addr: address to test
426 *
427 * Test whether @addr belongs to module static percpu area.
428 *
429 * RETURNS:
430 * %true if @addr is from module static percpu area
431 */
432bool is_module_percpu_address(unsigned long addr)
433{
434 struct module *mod;
435 unsigned int cpu;
436
437 preempt_disable();
438
439 list_for_each_entry_rcu(mod, &modules, list) {
440 if (!mod->percpu_size)
441 continue;
442 for_each_possible_cpu(cpu) {
443 void *start = per_cpu_ptr(mod->percpu, cpu);
444
445 if ((void *)addr >= start &&
446 (void *)addr < start + mod->percpu_size) {
447 preempt_enable();
448 return true;
449 }
450 }
451 }
452
453 preempt_enable();
454 return false;
Daniel Walker22a8bde2007-10-18 03:06:07 -0700455}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
457#else /* ... !CONFIG_SMP */
Tejun Heo6b588c12009-02-20 16:29:07 +0900458
Tejun Heo259354d2010-03-10 18:56:10 +0900459static inline void __percpu *mod_percpu(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460{
461 return NULL;
462}
Tejun Heo259354d2010-03-10 18:56:10 +0900463static inline int percpu_modalloc(struct module *mod,
464 unsigned long size, unsigned long align)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465{
Tejun Heo259354d2010-03-10 18:56:10 +0900466 return -ENOMEM;
467}
468static inline void percpu_modfree(struct module *mod)
469{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470}
471static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
472 Elf_Shdr *sechdrs,
473 const char *secstrings)
474{
475 return 0;
476}
Tejun Heo259354d2010-03-10 18:56:10 +0900477static inline void percpu_modcopy(struct module *mod,
478 const void *from, unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479{
480 /* pcpusec should be 0, and size of that section should be 0. */
481 BUG_ON(size != 0);
482}
Tejun Heo10fad5e2010-03-10 18:57:54 +0900483bool is_module_percpu_address(unsigned long addr)
484{
485 return false;
486}
Tejun Heo6b588c12009-02-20 16:29:07 +0900487
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488#endif /* CONFIG_SMP */
489
Matt Domschc988d2b2005-06-23 22:05:15 -0700490#define MODINFO_ATTR(field) \
491static void setup_modinfo_##field(struct module *mod, const char *s) \
492{ \
493 mod->field = kstrdup(s, GFP_KERNEL); \
494} \
495static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
496 struct module *mod, char *buffer) \
497{ \
498 return sprintf(buffer, "%s\n", mod->field); \
499} \
500static int modinfo_##field##_exists(struct module *mod) \
501{ \
502 return mod->field != NULL; \
503} \
504static void free_modinfo_##field(struct module *mod) \
505{ \
Daniel Walker22a8bde2007-10-18 03:06:07 -0700506 kfree(mod->field); \
507 mod->field = NULL; \
Matt Domschc988d2b2005-06-23 22:05:15 -0700508} \
509static struct module_attribute modinfo_##field = { \
Tejun Heo7b595752007-06-14 03:45:17 +0900510 .attr = { .name = __stringify(field), .mode = 0444 }, \
Matt Domschc988d2b2005-06-23 22:05:15 -0700511 .show = show_modinfo_##field, \
512 .setup = setup_modinfo_##field, \
513 .test = modinfo_##field##_exists, \
514 .free = free_modinfo_##field, \
515};
516
517MODINFO_ATTR(version);
518MODINFO_ATTR(srcversion);
519
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100520static char last_unloaded_module[MODULE_NAME_LEN+1];
521
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800522#ifdef CONFIG_MODULE_UNLOAD
Steven Rostedteb0c5372010-03-29 14:25:18 -0400523
524EXPORT_TRACEPOINT_SYMBOL(module_get);
525
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526/* Init the unload section of the module. */
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600527static int module_unload_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600529 mod->refptr = alloc_percpu(struct module_ref);
530 if (!mod->refptr)
531 return -ENOMEM;
532
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700533 INIT_LIST_HEAD(&mod->source_list);
534 INIT_LIST_HEAD(&mod->target_list);
Christoph Lametere1783a22010-01-05 15:34:50 +0900535
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 /* Hold reference count during initialization. */
Nick Piggin5fbfb182010-04-01 19:09:40 +1100537 __this_cpu_write(mod->refptr->incs, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 /* Backwards compatibility macros put refcount during init. */
539 mod->waiter = current;
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600540
541 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542}
543
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544/* Does a already use b? */
545static int already_uses(struct module *a, struct module *b)
546{
547 struct module_use *use;
548
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700549 list_for_each_entry(use, &b->source_list, source_list) {
550 if (use->source == a) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 DEBUGP("%s uses %s!\n", a->name, b->name);
552 return 1;
553 }
554 }
555 DEBUGP("%s does not use %s!\n", a->name, b->name);
556 return 0;
557}
558
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700559/*
560 * Module a uses b
561 * - we add 'a' as a "source", 'b' as a "target" of module use
562 * - the module_use is added to the list of 'b' sources (so
563 * 'b' can walk the list to see who sourced them), and of 'a'
564 * targets (so 'a' can see what modules it targets).
565 */
566static int add_module_usage(struct module *a, struct module *b)
567{
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700568 struct module_use *use;
569
570 DEBUGP("Allocating new usage for %s.\n", a->name);
571 use = kmalloc(sizeof(*use), GFP_ATOMIC);
572 if (!use) {
573 printk(KERN_WARNING "%s: out of memory loading\n", a->name);
574 return -ENOMEM;
575 }
576
577 use->source = a;
578 use->target = b;
579 list_add(&use->source_list, &b->source_list);
580 list_add(&use->target_list, &a->target_list);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700581 return 0;
582}
583
Rusty Russell75676502010-06-05 11:17:36 -0600584/* Module a uses b: caller needs module_mutex() */
Rusty Russell9bea7f22010-06-05 11:17:37 -0600585int ref_module(struct module *a, struct module *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586{
Rusty Russellc8e21ce2010-06-05 11:17:35 -0600587 int err;
Kay Sievers270a6c42007-01-18 13:26:15 +0100588
Rusty Russell9bea7f22010-06-05 11:17:37 -0600589 if (b == NULL || already_uses(a, b))
Linus Torvalds218ce732010-05-25 16:48:30 -0700590 return 0;
Linus Torvalds218ce732010-05-25 16:48:30 -0700591
Rusty Russell9bea7f22010-06-05 11:17:37 -0600592 /* If module isn't available, we fail. */
593 err = strong_try_module_get(b);
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500594 if (err)
Rusty Russell9bea7f22010-06-05 11:17:37 -0600595 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700597 err = add_module_usage(a, b);
598 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 module_put(b);
Rusty Russell9bea7f22010-06-05 11:17:37 -0600600 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 }
Rusty Russell9bea7f22010-06-05 11:17:37 -0600602 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603}
Rusty Russell9bea7f22010-06-05 11:17:37 -0600604EXPORT_SYMBOL_GPL(ref_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
606/* Clear the unload stuff of the module. */
607static void module_unload_free(struct module *mod)
608{
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700609 struct module_use *use, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
Rusty Russell75676502010-06-05 11:17:36 -0600611 mutex_lock(&module_mutex);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700612 list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
613 struct module *i = use->target;
614 DEBUGP("%s unusing %s\n", mod->name, i->name);
615 module_put(i);
616 list_del(&use->source_list);
617 list_del(&use->target_list);
618 kfree(use);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 }
Rusty Russell75676502010-06-05 11:17:36 -0600620 mutex_unlock(&module_mutex);
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600621
622 free_percpu(mod->refptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623}
624
625#ifdef CONFIG_MODULE_FORCE_UNLOAD
Akinobu Mitafb169792006-01-08 01:04:29 -0800626static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627{
628 int ret = (flags & O_TRUNC);
629 if (ret)
Akinobu Mitafb169792006-01-08 01:04:29 -0800630 add_taint(TAINT_FORCED_RMMOD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 return ret;
632}
633#else
Akinobu Mitafb169792006-01-08 01:04:29 -0800634static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635{
636 return 0;
637}
638#endif /* CONFIG_MODULE_FORCE_UNLOAD */
639
640struct stopref
641{
642 struct module *mod;
643 int flags;
644 int *forced;
645};
646
647/* Whole machine is stopped with interrupts off when this runs. */
648static int __try_stop_module(void *_sref)
649{
650 struct stopref *sref = _sref;
651
Rusty Russellda39ba52008-07-22 19:24:25 -0500652 /* If it's not unused, quit unless we're forcing. */
653 if (module_refcount(sref->mod) != 0) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800654 if (!(*sref->forced = try_force_unload(sref->flags)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 return -EWOULDBLOCK;
656 }
657
658 /* Mark it as dying. */
659 sref->mod->state = MODULE_STATE_GOING;
660 return 0;
661}
662
663static int try_stop_module(struct module *mod, int flags, int *forced)
664{
Rusty Russellda39ba52008-07-22 19:24:25 -0500665 if (flags & O_NONBLOCK) {
666 struct stopref sref = { mod, flags, forced };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
Rusty Russell9b1a4d32008-07-28 12:16:30 -0500668 return stop_machine(__try_stop_module, &sref, NULL);
Rusty Russellda39ba52008-07-22 19:24:25 -0500669 } else {
670 /* We don't need to stop the machine for this. */
671 mod->state = MODULE_STATE_GOING;
672 synchronize_sched();
673 return 0;
674 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675}
676
677unsigned int module_refcount(struct module *mod)
678{
Nick Piggin5fbfb182010-04-01 19:09:40 +1100679 unsigned int incs = 0, decs = 0;
Eric Dumazet720eba32009-02-03 13:31:36 +1030680 int cpu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
Eric Dumazet720eba32009-02-03 13:31:36 +1030682 for_each_possible_cpu(cpu)
Nick Piggin5fbfb182010-04-01 19:09:40 +1100683 decs += per_cpu_ptr(mod->refptr, cpu)->decs;
684 /*
685 * ensure the incs are added up after the decs.
686 * module_put ensures incs are visible before decs with smp_wmb.
687 *
688 * This 2-count scheme avoids the situation where the refcount
689 * for CPU0 is read, then CPU0 increments the module refcount,
690 * then CPU1 drops that refcount, then the refcount for CPU1 is
691 * read. We would record a decrement but not its corresponding
692 * increment so we would see a low count (disaster).
693 *
694 * Rare situation? But module_refcount can be preempted, and we
695 * might be tallying up 4096+ CPUs. So it is not impossible.
696 */
697 smp_rmb();
698 for_each_possible_cpu(cpu)
699 incs += per_cpu_ptr(mod->refptr, cpu)->incs;
700 return incs - decs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701}
702EXPORT_SYMBOL(module_refcount);
703
704/* This exists whether we can unload or not */
705static void free_module(struct module *mod);
706
707static void wait_for_zero_refcount(struct module *mod)
708{
Matthew Wilcoxa6550202008-02-26 10:47:18 -0500709 /* Since we might sleep for some time, release the mutex first */
Ashutosh Naik6389a382006-03-23 03:00:46 -0800710 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 for (;;) {
712 DEBUGP("Looking at refcount...\n");
713 set_current_state(TASK_UNINTERRUPTIBLE);
714 if (module_refcount(mod) == 0)
715 break;
716 schedule();
717 }
718 current->state = TASK_RUNNING;
Ashutosh Naik6389a382006-03-23 03:00:46 -0800719 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720}
721
Heiko Carstens17da2bd2009-01-14 14:14:10 +0100722SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
723 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724{
725 struct module *mod;
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800726 char name[MODULE_NAME_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 int ret, forced = 0;
728
Kees Cook3d433212009-04-02 15:49:29 -0700729 if (!capable(CAP_SYS_MODULE) || modules_disabled)
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800730 return -EPERM;
731
732 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
733 return -EFAULT;
734 name[MODULE_NAME_LEN-1] = '\0';
735
Tejun Heo3fc1f1e2010-05-06 18:49:20 +0200736 if (mutex_lock_interruptible(&module_mutex) != 0)
737 return -EINTR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
739 mod = find_module(name);
740 if (!mod) {
741 ret = -ENOENT;
742 goto out;
743 }
744
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700745 if (!list_empty(&mod->source_list)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 /* Other modules depend on us: get rid of them first. */
747 ret = -EWOULDBLOCK;
748 goto out;
749 }
750
751 /* Doing init or already dying? */
752 if (mod->state != MODULE_STATE_LIVE) {
753 /* FIXME: if (force), slam module count and wake up
754 waiter --RR */
755 DEBUGP("%s already dying\n", mod->name);
756 ret = -EBUSY;
757 goto out;
758 }
759
760 /* If it has an init func, it must have an exit func to unload */
Rusty Russellaf49d922007-10-16 23:26:27 -0700761 if (mod->init && !mod->exit) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800762 forced = try_force_unload(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 if (!forced) {
764 /* This module can't be removed */
765 ret = -EBUSY;
766 goto out;
767 }
768 }
769
770 /* Set this up before setting mod->state */
771 mod->waiter = current;
772
773 /* Stop the machine so refcounts can't move and disable module. */
774 ret = try_stop_module(mod, flags, &forced);
775 if (ret != 0)
776 goto out;
777
778 /* Never wait if forced. */
779 if (!forced && module_refcount(mod) != 0)
780 wait_for_zero_refcount(mod);
781
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200782 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 /* Final destruction now noone is using it. */
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200784 if (mod->exit != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 mod->exit();
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200786 blocking_notifier_call_chain(&module_notify_list,
787 MODULE_STATE_GOING, mod);
Arjan van de Ven22a9d642009-01-07 08:45:46 -0800788 async_synchronize_full();
Rusty Russell75676502010-06-05 11:17:36 -0600789
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100790 /* Store the name of the last unloaded module for diagnostic purposes */
Rusty Russellefa53452008-01-29 17:13:20 -0500791 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792
Rusty Russell75676502010-06-05 11:17:36 -0600793 free_module(mod);
794 return 0;
795out:
Ashutosh Naik6389a382006-03-23 03:00:46 -0800796 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 return ret;
798}
799
Jianjun Kongd1e99d72008-12-08 14:26:29 +0800800static inline void print_unload_info(struct seq_file *m, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801{
802 struct module_use *use;
803 int printed_something = 0;
804
805 seq_printf(m, " %u ", module_refcount(mod));
806
807 /* Always include a trailing , so userspace can differentiate
808 between this and the old multi-field proc format. */
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700809 list_for_each_entry(use, &mod->source_list, source_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 printed_something = 1;
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700811 seq_printf(m, "%s,", use->source->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 }
813
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 if (mod->init != NULL && mod->exit == NULL) {
815 printed_something = 1;
816 seq_printf(m, "[permanent],");
817 }
818
819 if (!printed_something)
820 seq_printf(m, "-");
821}
822
823void __symbol_put(const char *symbol)
824{
825 struct module *owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
Rusty Russell24da1cb2007-07-15 23:41:46 -0700827 preempt_disable();
Tim Abbott414fd312008-12-05 19:03:56 -0500828 if (!find_symbol(symbol, &owner, NULL, true, false))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 BUG();
830 module_put(owner);
Rusty Russell24da1cb2007-07-15 23:41:46 -0700831 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832}
833EXPORT_SYMBOL(__symbol_put);
834
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930835/* Note this assumes addr is a function, which it currently always is. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836void symbol_put_addr(void *addr)
837{
Trent Piepho5e376612006-05-15 09:44:06 -0700838 struct module *modaddr;
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930839 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930841 if (core_kernel_text(a))
Trent Piepho5e376612006-05-15 09:44:06 -0700842 return;
843
Rusty Russella6e6abd2009-03-31 13:05:31 -0600844 /* module_text_address is safe here: we're supposed to have reference
845 * to module from symbol_get, so it can't go away. */
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930846 modaddr = __module_text_address(a);
Rusty Russella6e6abd2009-03-31 13:05:31 -0600847 BUG_ON(!modaddr);
Trent Piepho5e376612006-05-15 09:44:06 -0700848 module_put(modaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849}
850EXPORT_SYMBOL_GPL(symbol_put_addr);
851
852static ssize_t show_refcnt(struct module_attribute *mattr,
853 struct module *mod, char *buffer)
854{
Alexey Dobriyan256e2fd2007-08-06 23:47:45 +0400855 return sprintf(buffer, "%u\n", module_refcount(mod));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856}
857
858static struct module_attribute refcnt = {
Tejun Heo7b595752007-06-14 03:45:17 +0900859 .attr = { .name = "refcnt", .mode = 0444 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 .show = show_refcnt,
861};
862
Al Virof6a57032006-10-18 01:47:25 -0400863void module_put(struct module *module)
864{
865 if (module) {
Christoph Lametere1783a22010-01-05 15:34:50 +0900866 preempt_disable();
Nick Piggin5fbfb182010-04-01 19:09:40 +1100867 smp_wmb(); /* see comment in module_refcount */
868 __this_cpu_inc(module->refptr->decs);
Christoph Lametere1783a22010-01-05 15:34:50 +0900869
Li Zefanae832d12010-03-24 10:57:43 +0800870 trace_module_put(module, _RET_IP_);
Al Virof6a57032006-10-18 01:47:25 -0400871 /* Maybe they're waiting for us to drop reference? */
872 if (unlikely(!module_is_live(module)))
873 wake_up_process(module->waiter);
Christoph Lametere1783a22010-01-05 15:34:50 +0900874 preempt_enable();
Al Virof6a57032006-10-18 01:47:25 -0400875 }
876}
877EXPORT_SYMBOL(module_put);
878
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879#else /* !CONFIG_MODULE_UNLOAD */
Jianjun Kongd1e99d72008-12-08 14:26:29 +0800880static inline void print_unload_info(struct seq_file *m, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881{
882 /* We don't know the usage count, or what modules are using. */
883 seq_printf(m, " - -");
884}
885
886static inline void module_unload_free(struct module *mod)
887{
888}
889
Rusty Russell9bea7f22010-06-05 11:17:37 -0600890int ref_module(struct module *a, struct module *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891{
Rusty Russell9bea7f22010-06-05 11:17:37 -0600892 return strong_try_module_get(b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893}
Rusty Russell9bea7f22010-06-05 11:17:37 -0600894EXPORT_SYMBOL_GPL(ref_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600896static inline int module_unload_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897{
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600898 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899}
900#endif /* CONFIG_MODULE_UNLOAD */
901
Kay Sievers1f717402006-11-24 12:15:25 +0100902static ssize_t show_initstate(struct module_attribute *mattr,
903 struct module *mod, char *buffer)
904{
905 const char *state = "unknown";
906
907 switch (mod->state) {
908 case MODULE_STATE_LIVE:
909 state = "live";
910 break;
911 case MODULE_STATE_COMING:
912 state = "coming";
913 break;
914 case MODULE_STATE_GOING:
915 state = "going";
916 break;
917 }
918 return sprintf(buffer, "%s\n", state);
919}
920
921static struct module_attribute initstate = {
Tejun Heo7b595752007-06-14 03:45:17 +0900922 .attr = { .name = "initstate", .mode = 0444 },
Kay Sievers1f717402006-11-24 12:15:25 +0100923 .show = show_initstate,
924};
925
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800926static struct module_attribute *modinfo_attrs[] = {
927 &modinfo_version,
928 &modinfo_srcversion,
Kay Sievers1f717402006-11-24 12:15:25 +0100929 &initstate,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800930#ifdef CONFIG_MODULE_UNLOAD
931 &refcnt,
932#endif
933 NULL,
934};
935
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936static const char vermagic[] = VERMAGIC_STRING;
937
Rusty Russellc6e665c2009-03-31 13:05:33 -0600938static int try_to_force_load(struct module *mod, const char *reason)
Linus Torvalds826e4502008-05-04 17:04:16 -0700939{
940#ifdef CONFIG_MODULE_FORCE_LOAD
Andi Kleen25ddbb12008-10-15 22:01:41 -0700941 if (!test_taint(TAINT_FORCED_MODULE))
Rusty Russellc6e665c2009-03-31 13:05:33 -0600942 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
943 mod->name, reason);
Linus Torvalds826e4502008-05-04 17:04:16 -0700944 add_taint_module(mod, TAINT_FORCED_MODULE);
945 return 0;
946#else
947 return -ENOEXEC;
948#endif
949}
950
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951#ifdef CONFIG_MODVERSIONS
Rusty Russelld4703ae2009-12-15 16:28:32 -0600952/* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
953static unsigned long maybe_relocated(unsigned long crc,
954 const struct module *crc_owner)
955{
956#ifdef ARCH_RELOCATES_KCRCTAB
957 if (crc_owner == NULL)
958 return crc - (unsigned long)reloc_start;
959#endif
960 return crc;
961}
962
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963static int check_version(Elf_Shdr *sechdrs,
964 unsigned int versindex,
965 const char *symname,
966 struct module *mod,
Rusty Russelld4703ae2009-12-15 16:28:32 -0600967 const unsigned long *crc,
968 const struct module *crc_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969{
970 unsigned int i, num_versions;
971 struct modversion_info *versions;
972
973 /* Exporting module didn't supply crcs? OK, we're already tainted. */
974 if (!crc)
975 return 1;
976
Rusty Russella5dd6972008-05-09 16:24:21 +1000977 /* No versions at all? modprobe --force does this. */
978 if (versindex == 0)
979 return try_to_force_load(mod, symname) == 0;
980
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 versions = (void *) sechdrs[versindex].sh_addr;
982 num_versions = sechdrs[versindex].sh_size
983 / sizeof(struct modversion_info);
984
985 for (i = 0; i < num_versions; i++) {
986 if (strcmp(versions[i].name, symname) != 0)
987 continue;
988
Rusty Russelld4703ae2009-12-15 16:28:32 -0600989 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 DEBUGP("Found checksum %lX vs module %lX\n",
Rusty Russelld4703ae2009-12-15 16:28:32 -0600992 maybe_relocated(*crc, crc_owner), versions[i].crc);
Linus Torvalds826e4502008-05-04 17:04:16 -0700993 goto bad_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 }
Linus Torvalds826e4502008-05-04 17:04:16 -0700995
Rusty Russella5dd6972008-05-09 16:24:21 +1000996 printk(KERN_WARNING "%s: no symbol version for %s\n",
997 mod->name, symname);
998 return 0;
Linus Torvalds826e4502008-05-04 17:04:16 -0700999
1000bad_version:
1001 printk("%s: disagrees about version of symbol %s\n",
1002 mod->name, symname);
1003 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004}
1005
1006static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1007 unsigned int versindex,
1008 struct module *mod)
1009{
1010 const unsigned long *crc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011
Rusty Russell75676502010-06-05 11:17:36 -06001012 /* Since this should be found in kernel (which can't be removed),
1013 * no locking is necessary. */
Mike Frysinger6560dc12009-07-23 23:42:08 +09301014 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
1015 &crc, true, false))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 BUG();
Rusty Russelld4703ae2009-12-15 16:28:32 -06001017 return check_version(sechdrs, versindex, "module_layout", mod, crc,
1018 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019}
1020
Rusty Russell91e37a72008-05-09 16:25:28 +10001021/* First part is kernel version, which we ignore if module has crcs. */
1022static inline int same_magic(const char *amagic, const char *bmagic,
1023 bool has_crcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024{
Rusty Russell91e37a72008-05-09 16:25:28 +10001025 if (has_crcs) {
1026 amagic += strcspn(amagic, " ");
1027 bmagic += strcspn(bmagic, " ");
1028 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 return strcmp(amagic, bmagic) == 0;
1030}
1031#else
1032static inline int check_version(Elf_Shdr *sechdrs,
1033 unsigned int versindex,
1034 const char *symname,
1035 struct module *mod,
Rusty Russelld4703ae2009-12-15 16:28:32 -06001036 const unsigned long *crc,
1037 const struct module *crc_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038{
1039 return 1;
1040}
1041
1042static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1043 unsigned int versindex,
1044 struct module *mod)
1045{
1046 return 1;
1047}
1048
Rusty Russell91e37a72008-05-09 16:25:28 +10001049static inline int same_magic(const char *amagic, const char *bmagic,
1050 bool has_crcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051{
1052 return strcmp(amagic, bmagic) == 0;
1053}
1054#endif /* CONFIG_MODVERSIONS */
1055
Rusty Russell75676502010-06-05 11:17:36 -06001056/* Resolve a symbol for this module. I.e. if we find one, record usage. */
Tim Abbott414fd312008-12-05 19:03:56 -05001057static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
1058 unsigned int versindex,
1059 const char *name,
Rusty Russell9bea7f22010-06-05 11:17:37 -06001060 struct module *mod,
1061 char ownername[])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062{
1063 struct module *owner;
Tim Abbott414fd312008-12-05 19:03:56 -05001064 const struct kernel_symbol *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 const unsigned long *crc;
Rusty Russell9bea7f22010-06-05 11:17:37 -06001066 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067
Rusty Russell75676502010-06-05 11:17:36 -06001068 mutex_lock(&module_mutex);
Tim Abbott414fd312008-12-05 19:03:56 -05001069 sym = find_symbol(name, &owner, &crc,
Andi Kleen25ddbb12008-10-15 22:01:41 -07001070 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
Rusty Russell9bea7f22010-06-05 11:17:37 -06001071 if (!sym)
1072 goto unlock;
1073
1074 if (!check_version(sechdrs, versindex, name, mod, crc, owner)) {
1075 sym = ERR_PTR(-EINVAL);
1076 goto getname;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 }
Rusty Russell9bea7f22010-06-05 11:17:37 -06001078
1079 err = ref_module(mod, owner);
1080 if (err) {
1081 sym = ERR_PTR(err);
1082 goto getname;
1083 }
1084
1085getname:
1086 /* We must make copy under the lock if we failed to get ref. */
1087 strncpy(ownername, module_name(owner), MODULE_NAME_LEN);
1088unlock:
Rusty Russell75676502010-06-05 11:17:36 -06001089 mutex_unlock(&module_mutex);
Linus Torvalds218ce732010-05-25 16:48:30 -07001090 return sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091}
1092
Rusty Russell9bea7f22010-06-05 11:17:37 -06001093static const struct kernel_symbol *resolve_symbol_wait(Elf_Shdr *sechdrs,
1094 unsigned int versindex,
1095 const char *name,
1096 struct module *mod)
1097{
1098 const struct kernel_symbol *ksym;
1099 char ownername[MODULE_NAME_LEN];
1100
1101 if (wait_event_interruptible_timeout(module_wq,
1102 !IS_ERR(ksym = resolve_symbol(sechdrs, versindex, name,
1103 mod, ownername)) ||
1104 PTR_ERR(ksym) != -EBUSY,
1105 30 * HZ) <= 0) {
1106 printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
1107 mod->name, ownername);
1108 }
1109 return ksym;
1110}
1111
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112/*
1113 * /sys/module/foo/sections stuff
1114 * J. Corbet <corbet@lwn.net>
1115 */
Kay Sievers120fc3d2008-02-21 00:33:20 +01001116#if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
Ben Hutchings10b465a2009-12-19 14:43:01 +00001117
1118static inline bool sect_empty(const Elf_Shdr *sect)
1119{
1120 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1121}
1122
Rusty Russella58730c2008-03-13 09:03:44 +00001123struct module_sect_attr
1124{
1125 struct module_attribute mattr;
1126 char *name;
1127 unsigned long address;
1128};
1129
1130struct module_sect_attrs
1131{
1132 struct attribute_group grp;
1133 unsigned int nsections;
1134 struct module_sect_attr attrs[0];
1135};
1136
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137static ssize_t module_sect_show(struct module_attribute *mattr,
1138 struct module *mod, char *buf)
1139{
1140 struct module_sect_attr *sattr =
1141 container_of(mattr, struct module_sect_attr, mattr);
1142 return sprintf(buf, "0x%lx\n", sattr->address);
1143}
1144
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001145static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1146{
Rusty Russella58730c2008-03-13 09:03:44 +00001147 unsigned int section;
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001148
1149 for (section = 0; section < sect_attrs->nsections; section++)
1150 kfree(sect_attrs->attrs[section].name);
1151 kfree(sect_attrs);
1152}
1153
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154static void add_sect_attrs(struct module *mod, unsigned int nsect,
1155 char *secstrings, Elf_Shdr *sechdrs)
1156{
1157 unsigned int nloaded = 0, i, size[2];
1158 struct module_sect_attrs *sect_attrs;
1159 struct module_sect_attr *sattr;
1160 struct attribute **gattr;
Daniel Walker22a8bde2007-10-18 03:06:07 -07001161
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 /* Count loaded sections and allocate structures */
1163 for (i = 0; i < nsect; i++)
Ben Hutchings10b465a2009-12-19 14:43:01 +00001164 if (!sect_empty(&sechdrs[i]))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 nloaded++;
1166 size[0] = ALIGN(sizeof(*sect_attrs)
1167 + nloaded * sizeof(sect_attrs->attrs[0]),
1168 sizeof(sect_attrs->grp.attrs[0]));
1169 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001170 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1171 if (sect_attrs == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 return;
1173
1174 /* Setup section attributes. */
1175 sect_attrs->grp.name = "sections";
1176 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1177
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001178 sect_attrs->nsections = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 sattr = &sect_attrs->attrs[0];
1180 gattr = &sect_attrs->grp.attrs[0];
1181 for (i = 0; i < nsect; i++) {
Ben Hutchings10b465a2009-12-19 14:43:01 +00001182 if (sect_empty(&sechdrs[i]))
Helge Deller35dead42009-12-03 00:29:15 +01001183 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 sattr->address = sechdrs[i].sh_addr;
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001185 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1186 GFP_KERNEL);
1187 if (sattr->name == NULL)
1188 goto out;
1189 sect_attrs->nsections++;
Eric W. Biederman361795b2010-02-12 13:41:56 -08001190 sysfs_attr_init(&sattr->mattr.attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 sattr->mattr.show = module_sect_show;
1192 sattr->mattr.store = NULL;
1193 sattr->mattr.attr.name = sattr->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 sattr->mattr.attr.mode = S_IRUGO;
1195 *(gattr++) = &(sattr++)->mattr.attr;
1196 }
1197 *gattr = NULL;
1198
1199 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
1200 goto out;
1201
1202 mod->sect_attrs = sect_attrs;
1203 return;
1204 out:
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001205 free_sect_attrs(sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206}
1207
1208static void remove_sect_attrs(struct module *mod)
1209{
1210 if (mod->sect_attrs) {
1211 sysfs_remove_group(&mod->mkobj.kobj,
1212 &mod->sect_attrs->grp);
1213 /* We are positive that no one is using any sect attrs
1214 * at this point. Deallocate immediately. */
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001215 free_sect_attrs(mod->sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 mod->sect_attrs = NULL;
1217 }
1218}
1219
Roland McGrath6d760132007-10-16 23:26:40 -07001220/*
1221 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1222 */
1223
1224struct module_notes_attrs {
1225 struct kobject *dir;
1226 unsigned int notes;
1227 struct bin_attribute attrs[0];
1228};
1229
Chris Wright2c3c8be2010-05-12 18:28:57 -07001230static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
Roland McGrath6d760132007-10-16 23:26:40 -07001231 struct bin_attribute *bin_attr,
1232 char *buf, loff_t pos, size_t count)
1233{
1234 /*
1235 * The caller checked the pos and count against our size.
1236 */
1237 memcpy(buf, bin_attr->private + pos, count);
1238 return count;
1239}
1240
1241static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1242 unsigned int i)
1243{
1244 if (notes_attrs->dir) {
1245 while (i-- > 0)
1246 sysfs_remove_bin_file(notes_attrs->dir,
1247 &notes_attrs->attrs[i]);
Alexey Dobriyane9432092008-09-23 23:51:11 +04001248 kobject_put(notes_attrs->dir);
Roland McGrath6d760132007-10-16 23:26:40 -07001249 }
1250 kfree(notes_attrs);
1251}
1252
1253static void add_notes_attrs(struct module *mod, unsigned int nsect,
1254 char *secstrings, Elf_Shdr *sechdrs)
1255{
1256 unsigned int notes, loaded, i;
1257 struct module_notes_attrs *notes_attrs;
1258 struct bin_attribute *nattr;
1259
Ingo Molnarea6bff32009-08-28 10:44:56 +02001260 /* failed to create section attributes, so can't create notes */
1261 if (!mod->sect_attrs)
1262 return;
1263
Roland McGrath6d760132007-10-16 23:26:40 -07001264 /* Count notes sections and allocate structures. */
1265 notes = 0;
1266 for (i = 0; i < nsect; i++)
Ben Hutchings10b465a2009-12-19 14:43:01 +00001267 if (!sect_empty(&sechdrs[i]) &&
Roland McGrath6d760132007-10-16 23:26:40 -07001268 (sechdrs[i].sh_type == SHT_NOTE))
1269 ++notes;
1270
1271 if (notes == 0)
1272 return;
1273
1274 notes_attrs = kzalloc(sizeof(*notes_attrs)
1275 + notes * sizeof(notes_attrs->attrs[0]),
1276 GFP_KERNEL);
1277 if (notes_attrs == NULL)
1278 return;
1279
1280 notes_attrs->notes = notes;
1281 nattr = &notes_attrs->attrs[0];
1282 for (loaded = i = 0; i < nsect; ++i) {
Ben Hutchings10b465a2009-12-19 14:43:01 +00001283 if (sect_empty(&sechdrs[i]))
Roland McGrath6d760132007-10-16 23:26:40 -07001284 continue;
1285 if (sechdrs[i].sh_type == SHT_NOTE) {
Eric W. Biederman361795b2010-02-12 13:41:56 -08001286 sysfs_bin_attr_init(nattr);
Roland McGrath6d760132007-10-16 23:26:40 -07001287 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1288 nattr->attr.mode = S_IRUGO;
1289 nattr->size = sechdrs[i].sh_size;
1290 nattr->private = (void *) sechdrs[i].sh_addr;
1291 nattr->read = module_notes_read;
1292 ++nattr;
1293 }
1294 ++loaded;
1295 }
1296
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001297 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
Roland McGrath6d760132007-10-16 23:26:40 -07001298 if (!notes_attrs->dir)
1299 goto out;
1300
1301 for (i = 0; i < notes; ++i)
1302 if (sysfs_create_bin_file(notes_attrs->dir,
1303 &notes_attrs->attrs[i]))
1304 goto out;
1305
1306 mod->notes_attrs = notes_attrs;
1307 return;
1308
1309 out:
1310 free_notes_attrs(notes_attrs, i);
1311}
1312
1313static void remove_notes_attrs(struct module *mod)
1314{
1315 if (mod->notes_attrs)
1316 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1317}
1318
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319#else
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001320
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1322 char *sectstrings, Elf_Shdr *sechdrs)
1323{
1324}
1325
1326static inline void remove_sect_attrs(struct module *mod)
1327{
1328}
Roland McGrath6d760132007-10-16 23:26:40 -07001329
1330static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1331 char *sectstrings, Elf_Shdr *sechdrs)
1332{
1333}
1334
1335static inline void remove_notes_attrs(struct module *mod)
1336{
1337}
Kay Sievers120fc3d2008-02-21 00:33:20 +01001338#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339
Randy Dunlapef665c12007-02-13 15:19:06 -08001340#ifdef CONFIG_SYSFS
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001341static void add_usage_links(struct module *mod)
1342{
1343#ifdef CONFIG_MODULE_UNLOAD
1344 struct module_use *use;
1345 int nowarn;
1346
Rusty Russell75676502010-06-05 11:17:36 -06001347 mutex_lock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001348 list_for_each_entry(use, &mod->target_list, target_list) {
1349 nowarn = sysfs_create_link(use->target->holders_dir,
1350 &mod->mkobj.kobj, mod->name);
1351 }
Rusty Russell75676502010-06-05 11:17:36 -06001352 mutex_unlock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001353#endif
1354}
1355
1356static void del_usage_links(struct module *mod)
1357{
1358#ifdef CONFIG_MODULE_UNLOAD
1359 struct module_use *use;
1360
Rusty Russell75676502010-06-05 11:17:36 -06001361 mutex_lock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001362 list_for_each_entry(use, &mod->target_list, target_list)
1363 sysfs_remove_link(use->target->holders_dir, mod->name);
Rusty Russell75676502010-06-05 11:17:36 -06001364 mutex_unlock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001365#endif
1366}
1367
Rusty Russell6407ebb22010-06-05 11:17:36 -06001368static int module_add_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001369{
1370 struct module_attribute *attr;
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001371 struct module_attribute *temp_attr;
Matt Domschc988d2b2005-06-23 22:05:15 -07001372 int error = 0;
1373 int i;
1374
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001375 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1376 (ARRAY_SIZE(modinfo_attrs) + 1)),
1377 GFP_KERNEL);
1378 if (!mod->modinfo_attrs)
1379 return -ENOMEM;
1380
1381 temp_attr = mod->modinfo_attrs;
Matt Domschc988d2b2005-06-23 22:05:15 -07001382 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1383 if (!attr->test ||
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001384 (attr->test && attr->test(mod))) {
1385 memcpy(temp_attr, attr, sizeof(*temp_attr));
Eric W. Biederman361795b2010-02-12 13:41:56 -08001386 sysfs_attr_init(&temp_attr->attr);
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001387 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1388 ++temp_attr;
1389 }
Matt Domschc988d2b2005-06-23 22:05:15 -07001390 }
1391 return error;
1392}
1393
Rusty Russell6407ebb22010-06-05 11:17:36 -06001394static void module_remove_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001395{
1396 struct module_attribute *attr;
1397 int i;
1398
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001399 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1400 /* pick a field to test for end of list */
1401 if (!attr->attr.name)
1402 break;
Matt Domschc988d2b2005-06-23 22:05:15 -07001403 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001404 if (attr->free)
1405 attr->free(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001406 }
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001407 kfree(mod->modinfo_attrs);
Matt Domschc988d2b2005-06-23 22:05:15 -07001408}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409
Rusty Russell6407ebb22010-06-05 11:17:36 -06001410static int mod_sysfs_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411{
1412 int err;
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001413 struct kobject *kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -07001415 if (!module_sysfs_initialized) {
1416 printk(KERN_ERR "%s: module sysfs not initialized\n",
Ed Swierk1cc5f712006-09-25 16:25:36 -07001417 mod->name);
1418 err = -EINVAL;
1419 goto out;
1420 }
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001421
1422 kobj = kset_find_obj(module_kset, mod->name);
1423 if (kobj) {
1424 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1425 kobject_put(kobj);
1426 err = -EINVAL;
1427 goto out;
1428 }
1429
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 mod->mkobj.mod = mod;
Kay Sieverse17e0f52006-11-24 12:15:25 +01001431
Greg Kroah-Hartmanac3c8142007-12-17 23:05:35 -07001432 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1433 mod->mkobj.kobj.kset = module_kset;
1434 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1435 "%s", mod->name);
1436 if (err)
1437 kobject_put(&mod->mkobj.kobj);
Kay Sievers270a6c42007-01-18 13:26:15 +01001438
Kay Sievers97c146e2007-11-29 23:46:11 +01001439 /* delay uevent until full sysfs population */
Kay Sievers270a6c42007-01-18 13:26:15 +01001440out:
1441 return err;
1442}
1443
Rusty Russell6407ebb22010-06-05 11:17:36 -06001444static int mod_sysfs_setup(struct module *mod,
Kay Sievers270a6c42007-01-18 13:26:15 +01001445 struct kernel_param *kparam,
1446 unsigned int num_params)
1447{
1448 int err;
1449
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001450 err = mod_sysfs_init(mod);
1451 if (err)
1452 goto out;
1453
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001454 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
Akinobu Mita240936e2007-04-26 00:12:09 -07001455 if (!mod->holders_dir) {
1456 err = -ENOMEM;
Kay Sievers270a6c42007-01-18 13:26:15 +01001457 goto out_unreg;
Akinobu Mita240936e2007-04-26 00:12:09 -07001458 }
Kay Sievers270a6c42007-01-18 13:26:15 +01001459
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 err = module_param_sysfs_setup(mod, kparam, num_params);
1461 if (err)
Kay Sievers270a6c42007-01-18 13:26:15 +01001462 goto out_unreg_holders;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463
Matt Domschc988d2b2005-06-23 22:05:15 -07001464 err = module_add_modinfo_attrs(mod);
1465 if (err)
Kay Sieverse17e0f52006-11-24 12:15:25 +01001466 goto out_unreg_param;
Matt Domschc988d2b2005-06-23 22:05:15 -07001467
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001468 add_usage_links(mod);
1469
Kay Sieverse17e0f52006-11-24 12:15:25 +01001470 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 return 0;
1472
Kay Sieverse17e0f52006-11-24 12:15:25 +01001473out_unreg_param:
1474 module_param_sysfs_remove(mod);
Kay Sievers270a6c42007-01-18 13:26:15 +01001475out_unreg_holders:
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001476 kobject_put(mod->holders_dir);
Kay Sievers270a6c42007-01-18 13:26:15 +01001477out_unreg:
Kay Sieverse17e0f52006-11-24 12:15:25 +01001478 kobject_put(&mod->mkobj.kobj);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001479out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 return err;
1481}
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001482
1483static void mod_sysfs_fini(struct module *mod)
1484{
1485 kobject_put(&mod->mkobj.kobj);
1486}
1487
1488#else /* CONFIG_SYSFS */
1489
Rusty Russell6407ebb22010-06-05 11:17:36 -06001490static inline int mod_sysfs_init(struct module *mod)
1491{
1492 return 0;
1493}
1494
1495static inline int mod_sysfs_setup(struct module *mod,
1496 struct kernel_param *kparam,
1497 unsigned int num_params)
1498{
1499 return 0;
1500}
1501
1502static inline int module_add_modinfo_attrs(struct module *mod)
1503{
1504 return 0;
1505}
1506
1507static inline void module_remove_modinfo_attrs(struct module *mod)
1508{
1509}
1510
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001511static void mod_sysfs_fini(struct module *mod)
1512{
1513}
1514
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001515static void del_usage_links(struct module *mod)
1516{
1517}
1518
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001519#endif /* CONFIG_SYSFS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520
1521static void mod_kobject_remove(struct module *mod)
1522{
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001523 del_usage_links(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001524 module_remove_modinfo_attrs(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 module_param_sysfs_remove(mod);
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001526 kobject_put(mod->mkobj.drivers_dir);
1527 kobject_put(mod->holders_dir);
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001528 mod_sysfs_fini(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529}
1530
1531/*
1532 * unlink the module with the whole machine is stopped with interrupts off
1533 * - this defends against kallsyms not taking locks
1534 */
1535static int __unlink_module(void *_mod)
1536{
1537 struct module *mod = _mod;
1538 list_del(&mod->list);
1539 return 0;
1540}
1541
Rusty Russell75676502010-06-05 11:17:36 -06001542/* Free a module, remove from lists, etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543static void free_module(struct module *mod)
1544{
Li Zefan7ead8b82009-08-17 16:56:28 +08001545 trace_module_free(mod);
1546
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547 /* Delete from various lists */
Rusty Russell75676502010-06-05 11:17:36 -06001548 mutex_lock(&module_mutex);
Rusty Russell9b1a4d32008-07-28 12:16:30 -05001549 stop_machine(__unlink_module, mod, NULL);
Rusty Russell75676502010-06-05 11:17:36 -06001550 mutex_unlock(&module_mutex);
Roland McGrath6d760132007-10-16 23:26:40 -07001551 remove_notes_attrs(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552 remove_sect_attrs(mod);
1553 mod_kobject_remove(mod);
1554
Jason Baronb82bab4b2010-07-27 13:18:01 -07001555 /* Remove dynamic debug info */
1556 ddebug_remove_module(mod->name);
1557
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558 /* Arch-specific cleanup. */
1559 module_arch_cleanup(mod);
1560
1561 /* Module unload stuff */
1562 module_unload_free(mod);
1563
Rusty Russelle180a6b2009-03-31 13:05:29 -06001564 /* Free any allocated parameters. */
1565 destroy_params(mod->kp, mod->num_kp);
1566
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 /* This may be NULL, but that's OK */
1568 module_free(mod, mod->module_init);
1569 kfree(mod->args);
Tejun Heo259354d2010-03-10 18:56:10 +09001570 percpu_modfree(mod);
Rusty Russell9f85a4b2010-08-05 12:59:04 -06001571
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001572 /* Free lock-classes: */
1573 lockdep_free_key_range(mod->module_core, mod->core_size);
1574
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 /* Finally, free the core (containing the module structure) */
1576 module_free(mod, mod->module_core);
Bernd Schmidteb8cdec2009-09-21 17:03:57 -07001577
1578#ifdef CONFIG_MPU
1579 update_protections(current->mm);
1580#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581}
1582
1583void *__symbol_get(const char *symbol)
1584{
1585 struct module *owner;
Tim Abbott414fd312008-12-05 19:03:56 -05001586 const struct kernel_symbol *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587
Rusty Russell24da1cb2007-07-15 23:41:46 -07001588 preempt_disable();
Tim Abbott414fd312008-12-05 19:03:56 -05001589 sym = find_symbol(symbol, &owner, NULL, true, true);
1590 if (sym && strong_try_module_get(owner))
1591 sym = NULL;
Rusty Russell24da1cb2007-07-15 23:41:46 -07001592 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593
Tim Abbott414fd312008-12-05 19:03:56 -05001594 return sym ? (void *)sym->value : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595}
1596EXPORT_SYMBOL_GPL(__symbol_get);
1597
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001598/*
1599 * Ensure that an exported symbol [global namespace] does not already exist
Robert P. J. Day02a3e592007-05-09 07:26:28 +02001600 * in the kernel or in some other module's exported symbol table.
Rusty Russellbe593f42010-06-05 11:17:37 -06001601 *
1602 * You must hold the module_mutex.
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001603 */
1604static int verify_export_symbols(struct module *mod)
1605{
Rusty Russellb2111042008-05-01 21:15:00 -05001606 unsigned int i;
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001607 struct module *owner;
Rusty Russellb2111042008-05-01 21:15:00 -05001608 const struct kernel_symbol *s;
1609 struct {
1610 const struct kernel_symbol *sym;
1611 unsigned int num;
1612 } arr[] = {
1613 { mod->syms, mod->num_syms },
1614 { mod->gpl_syms, mod->num_gpl_syms },
1615 { mod->gpl_future_syms, mod->num_gpl_future_syms },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001616#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russellb2111042008-05-01 21:15:00 -05001617 { mod->unused_syms, mod->num_unused_syms },
1618 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001619#endif
Rusty Russellb2111042008-05-01 21:15:00 -05001620 };
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001621
Rusty Russellb2111042008-05-01 21:15:00 -05001622 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1623 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
Rusty Russellbe593f42010-06-05 11:17:37 -06001624 if (find_symbol(s->name, &owner, NULL, true, false)) {
Rusty Russellb2111042008-05-01 21:15:00 -05001625 printk(KERN_ERR
1626 "%s: exports duplicate symbol %s"
1627 " (owned by %s)\n",
1628 mod->name, s->name, module_name(owner));
1629 return -ENOEXEC;
1630 }
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001631 }
Rusty Russellb2111042008-05-01 21:15:00 -05001632 }
1633 return 0;
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001634}
1635
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -08001636/* Change all symbols so that st_value encodes the pointer directly. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637static int simplify_symbols(Elf_Shdr *sechdrs,
1638 unsigned int symindex,
1639 const char *strtab,
1640 unsigned int versindex,
1641 unsigned int pcpuindex,
1642 struct module *mod)
1643{
1644 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1645 unsigned long secbase;
1646 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1647 int ret = 0;
Tim Abbott414fd312008-12-05 19:03:56 -05001648 const struct kernel_symbol *ksym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649
1650 for (i = 1; i < n; i++) {
1651 switch (sym[i].st_shndx) {
1652 case SHN_COMMON:
1653 /* We compiled with -fno-common. These are not
1654 supposed to happen. */
1655 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1656 printk("%s: please compile with -fno-common\n",
1657 mod->name);
1658 ret = -ENOEXEC;
1659 break;
1660
1661 case SHN_ABS:
1662 /* Don't need to do anything */
1663 DEBUGP("Absolute symbol: 0x%08lx\n",
1664 (long)sym[i].st_value);
1665 break;
1666
1667 case SHN_UNDEF:
Rusty Russell9bea7f22010-06-05 11:17:37 -06001668 ksym = resolve_symbol_wait(sechdrs, versindex,
1669 strtab + sym[i].st_name,
1670 mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 /* Ok if resolved. */
Rusty Russell9bea7f22010-06-05 11:17:37 -06001672 if (ksym && !IS_ERR(ksym)) {
Tim Abbott414fd312008-12-05 19:03:56 -05001673 sym[i].st_value = ksym->value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 break;
Tim Abbott414fd312008-12-05 19:03:56 -05001675 }
1676
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677 /* Ok if weak. */
Rusty Russell9bea7f22010-06-05 11:17:37 -06001678 if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 break;
1680
Rusty Russell9bea7f22010-06-05 11:17:37 -06001681 printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
1682 mod->name, strtab + sym[i].st_name,
1683 PTR_ERR(ksym));
1684 ret = PTR_ERR(ksym) ?: -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 break;
1686
1687 default:
1688 /* Divert to percpu allocation if a percpu var. */
1689 if (sym[i].st_shndx == pcpuindex)
Tejun Heo259354d2010-03-10 18:56:10 +09001690 secbase = (unsigned long)mod_percpu(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001691 else
1692 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1693 sym[i].st_value += secbase;
1694 break;
1695 }
1696 }
1697
1698 return ret;
1699}
1700
Rusty Russell22e268e2010-08-05 12:59:05 -06001701static int apply_relocations(struct module *mod,
1702 Elf_Ehdr *hdr,
1703 Elf_Shdr *sechdrs,
1704 unsigned int symindex,
1705 unsigned int strindex)
1706{
1707 unsigned int i;
1708 int err = 0;
1709
1710 /* Now do relocations. */
1711 for (i = 1; i < hdr->e_shnum; i++) {
1712 const char *strtab = (char *)sechdrs[strindex].sh_addr;
1713 unsigned int info = sechdrs[i].sh_info;
1714
1715 /* Not a valid relocation section? */
1716 if (info >= hdr->e_shnum)
1717 continue;
1718
1719 /* Don't bother with non-allocated sections */
1720 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
1721 continue;
1722
1723 if (sechdrs[i].sh_type == SHT_REL)
1724 err = apply_relocate(sechdrs, strtab, symindex, i, mod);
1725 else if (sechdrs[i].sh_type == SHT_RELA)
1726 err = apply_relocate_add(sechdrs, strtab, symindex, i,
1727 mod);
1728 if (err < 0)
1729 break;
1730 }
1731 return err;
1732}
1733
Helge Deller088af9a2008-12-31 12:31:18 +01001734/* Additional bytes needed by arch in front of individual sections */
1735unsigned int __weak arch_mod_section_prepend(struct module *mod,
1736 unsigned int section)
1737{
1738 /* default implementation just returns zero */
1739 return 0;
1740}
1741
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742/* Update size with this section: return offset. */
Helge Deller088af9a2008-12-31 12:31:18 +01001743static long get_offset(struct module *mod, unsigned int *size,
1744 Elf_Shdr *sechdr, unsigned int section)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745{
1746 long ret;
1747
Helge Deller088af9a2008-12-31 12:31:18 +01001748 *size += arch_mod_section_prepend(mod, section);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1750 *size = ret + sechdr->sh_size;
1751 return ret;
1752}
1753
1754/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1755 might -- code, read-only data, read-write data, small data. Tally
1756 sizes, and place the offsets into sh_entsize fields: high bit means it
1757 belongs in init. */
1758static void layout_sections(struct module *mod,
1759 const Elf_Ehdr *hdr,
1760 Elf_Shdr *sechdrs,
1761 const char *secstrings)
1762{
1763 static unsigned long const masks[][2] = {
1764 /* NOTE: all executable code must be the first section
1765 * in this array; otherwise modify the text_size
1766 * finder in the two loops below */
1767 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1768 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1769 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1770 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1771 };
1772 unsigned int m, i;
1773
1774 for (i = 0; i < hdr->e_shnum; i++)
1775 sechdrs[i].sh_entsize = ~0UL;
1776
1777 DEBUGP("Core section allocation order:\n");
1778 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1779 for (i = 0; i < hdr->e_shnum; ++i) {
1780 Elf_Shdr *s = &sechdrs[i];
1781
1782 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1783 || (s->sh_flags & masks[m][1])
1784 || s->sh_entsize != ~0UL
Rusty Russell49502672009-03-31 13:05:36 -06001785 || strstarts(secstrings + s->sh_name, ".init"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786 continue;
Helge Deller088af9a2008-12-31 12:31:18 +01001787 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 DEBUGP("\t%s\n", secstrings + s->sh_name);
1789 }
1790 if (m == 0)
1791 mod->core_text_size = mod->core_size;
1792 }
1793
1794 DEBUGP("Init section allocation order:\n");
1795 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1796 for (i = 0; i < hdr->e_shnum; ++i) {
1797 Elf_Shdr *s = &sechdrs[i];
1798
1799 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1800 || (s->sh_flags & masks[m][1])
1801 || s->sh_entsize != ~0UL
Rusty Russell49502672009-03-31 13:05:36 -06001802 || !strstarts(secstrings + s->sh_name, ".init"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803 continue;
Helge Deller088af9a2008-12-31 12:31:18 +01001804 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 | INIT_OFFSET_MASK);
1806 DEBUGP("\t%s\n", secstrings + s->sh_name);
1807 }
1808 if (m == 0)
1809 mod->init_text_size = mod->init_size;
1810 }
1811}
1812
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813static void set_license(struct module *mod, const char *license)
1814{
1815 if (!license)
1816 license = "unspecified";
1817
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001818 if (!license_is_gpl_compatible(license)) {
Andi Kleen25ddbb12008-10-15 22:01:41 -07001819 if (!test_taint(TAINT_PROPRIETARY_MODULE))
Jan Dittmer1d4d2622006-10-28 10:38:38 -07001820 printk(KERN_WARNING "%s: module license '%s' taints "
Florin Malitafa3ba2e82006-10-11 01:21:48 -07001821 "kernel.\n", mod->name, license);
1822 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 }
1824}
1825
1826/* Parse tag=value strings from .modinfo section */
1827static char *next_string(char *string, unsigned long *secsize)
1828{
1829 /* Skip non-zero chars */
1830 while (string[0]) {
1831 string++;
1832 if ((*secsize)-- <= 1)
1833 return NULL;
1834 }
1835
1836 /* Skip any zero padding. */
1837 while (!string[0]) {
1838 string++;
1839 if ((*secsize)-- <= 1)
1840 return NULL;
1841 }
1842 return string;
1843}
1844
Rusty Russell40dd2562010-08-05 12:59:03 -06001845static char *get_modinfo(const Elf_Shdr *sechdrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846 unsigned int info,
1847 const char *tag)
1848{
1849 char *p;
1850 unsigned int taglen = strlen(tag);
1851 unsigned long size = sechdrs[info].sh_size;
1852
1853 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1854 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1855 return p + taglen + 1;
1856 }
1857 return NULL;
1858}
1859
Matt Domschc988d2b2005-06-23 22:05:15 -07001860static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1861 unsigned int infoindex)
1862{
1863 struct module_attribute *attr;
1864 int i;
1865
1866 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1867 if (attr->setup)
1868 attr->setup(mod,
1869 get_modinfo(sechdrs,
1870 infoindex,
1871 attr->attr.name));
1872 }
1873}
Matt Domschc988d2b2005-06-23 22:05:15 -07001874
Rusty Russella263f772009-09-25 00:32:58 -06001875static void free_modinfo(struct module *mod)
1876{
1877 struct module_attribute *attr;
1878 int i;
1879
1880 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1881 if (attr->free)
1882 attr->free(mod);
1883 }
1884}
1885
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886#ifdef CONFIG_KALLSYMS
WANG Cong15bba372008-07-24 15:41:48 +01001887
1888/* lookup symbol in given range of kernel_symbols */
1889static const struct kernel_symbol *lookup_symbol(const char *name,
1890 const struct kernel_symbol *start,
1891 const struct kernel_symbol *stop)
1892{
1893 const struct kernel_symbol *ks = start;
1894 for (; ks < stop; ks++)
1895 if (strcmp(ks->name, name) == 0)
1896 return ks;
1897 return NULL;
1898}
1899
Tim Abbottca4787b2009-01-05 08:40:10 -06001900static int is_exported(const char *name, unsigned long value,
1901 const struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902{
Tim Abbottca4787b2009-01-05 08:40:10 -06001903 const struct kernel_symbol *ks;
1904 if (!mod)
1905 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
Sam Ravnborg3fd68052006-02-08 21:16:45 +01001906 else
Tim Abbottca4787b2009-01-05 08:40:10 -06001907 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1908 return ks != NULL && ks->value == value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909}
1910
1911/* As per nm */
1912static char elf_type(const Elf_Sym *sym,
1913 Elf_Shdr *sechdrs,
1914 const char *secstrings,
1915 struct module *mod)
1916{
1917 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1918 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1919 return 'v';
1920 else
1921 return 'w';
1922 }
1923 if (sym->st_shndx == SHN_UNDEF)
1924 return 'U';
1925 if (sym->st_shndx == SHN_ABS)
1926 return 'a';
1927 if (sym->st_shndx >= SHN_LORESERVE)
1928 return '?';
1929 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1930 return 't';
1931 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1932 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1933 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1934 return 'r';
1935 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1936 return 'g';
1937 else
1938 return 'd';
1939 }
1940 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1941 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1942 return 's';
1943 else
1944 return 'b';
1945 }
Rusty Russell49502672009-03-31 13:05:36 -06001946 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 return 'n';
1948 return '?';
1949}
1950
Jan Beulich4a496222009-07-06 14:50:42 +01001951static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
1952 unsigned int shnum)
1953{
1954 const Elf_Shdr *sec;
1955
1956 if (src->st_shndx == SHN_UNDEF
1957 || src->st_shndx >= shnum
1958 || !src->st_name)
1959 return false;
1960
1961 sec = sechdrs + src->st_shndx;
1962 if (!(sec->sh_flags & SHF_ALLOC)
1963#ifndef CONFIG_KALLSYMS_ALL
1964 || !(sec->sh_flags & SHF_EXECINSTR)
1965#endif
1966 || (sec->sh_entsize & INIT_OFFSET_MASK))
1967 return false;
1968
1969 return true;
1970}
1971
1972static unsigned long layout_symtab(struct module *mod,
1973 Elf_Shdr *sechdrs,
1974 unsigned int symindex,
Jan Beulich554bdfe2009-07-06 14:51:44 +01001975 unsigned int strindex,
Jan Beulich4a496222009-07-06 14:50:42 +01001976 const Elf_Ehdr *hdr,
Jan Beulich554bdfe2009-07-06 14:51:44 +01001977 const char *secstrings,
1978 unsigned long *pstroffs,
1979 unsigned long *strmap)
Jan Beulich4a496222009-07-06 14:50:42 +01001980{
1981 unsigned long symoffs;
1982 Elf_Shdr *symsect = sechdrs + symindex;
Jan Beulich554bdfe2009-07-06 14:51:44 +01001983 Elf_Shdr *strsect = sechdrs + strindex;
Jan Beulich4a496222009-07-06 14:50:42 +01001984 const Elf_Sym *src;
Jan Beulich554bdfe2009-07-06 14:51:44 +01001985 const char *strtab;
Jan Beulich4a496222009-07-06 14:50:42 +01001986 unsigned int i, nsrc, ndst;
1987
1988 /* Put symbol section at end of init part of module. */
1989 symsect->sh_flags |= SHF_ALLOC;
1990 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
1991 symindex) | INIT_OFFSET_MASK;
1992 DEBUGP("\t%s\n", secstrings + symsect->sh_name);
1993
1994 src = (void *)hdr + symsect->sh_offset;
1995 nsrc = symsect->sh_size / sizeof(*src);
Jan Beulich554bdfe2009-07-06 14:51:44 +01001996 strtab = (void *)hdr + strsect->sh_offset;
Jan Beulich4a496222009-07-06 14:50:42 +01001997 for (ndst = i = 1; i < nsrc; ++i, ++src)
Jan Beulich554bdfe2009-07-06 14:51:44 +01001998 if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
1999 unsigned int j = src->st_name;
2000
2001 while(!__test_and_set_bit(j, strmap) && strtab[j])
2002 ++j;
Jan Beulich4a496222009-07-06 14:50:42 +01002003 ++ndst;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002004 }
Jan Beulich4a496222009-07-06 14:50:42 +01002005
2006 /* Append room for core symbols at end of core part. */
2007 symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
2008 mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
2009
Jan Beulich554bdfe2009-07-06 14:51:44 +01002010 /* Put string table section at end of init part of module. */
2011 strsect->sh_flags |= SHF_ALLOC;
2012 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
2013 strindex) | INIT_OFFSET_MASK;
2014 DEBUGP("\t%s\n", secstrings + strsect->sh_name);
2015
2016 /* Append room for core symbols' strings at end of core part. */
2017 *pstroffs = mod->core_size;
2018 __set_bit(0, strmap);
2019 mod->core_size += bitmap_weight(strmap, strsect->sh_size);
2020
Jan Beulich4a496222009-07-06 14:50:42 +01002021 return symoffs;
2022}
2023
Linus Torvalds1da177e2005-04-16 15:20:36 -07002024static void add_kallsyms(struct module *mod,
2025 Elf_Shdr *sechdrs,
Jan Beulich4a496222009-07-06 14:50:42 +01002026 unsigned int shnum,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027 unsigned int symindex,
2028 unsigned int strindex,
Jan Beulich4a496222009-07-06 14:50:42 +01002029 unsigned long symoffs,
Jan Beulich554bdfe2009-07-06 14:51:44 +01002030 unsigned long stroffs,
2031 const char *secstrings,
2032 unsigned long *strmap)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033{
Jan Beulich4a496222009-07-06 14:50:42 +01002034 unsigned int i, ndst;
2035 const Elf_Sym *src;
2036 Elf_Sym *dst;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002037 char *s;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038
2039 mod->symtab = (void *)sechdrs[symindex].sh_addr;
2040 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
2041 mod->strtab = (void *)sechdrs[strindex].sh_addr;
2042
2043 /* Set types up while we still have access to sections. */
2044 for (i = 0; i < mod->num_symtab; i++)
2045 mod->symtab[i].st_info
2046 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
Jan Beulich4a496222009-07-06 14:50:42 +01002047
2048 mod->core_symtab = dst = mod->module_core + symoffs;
2049 src = mod->symtab;
2050 *dst = *src;
2051 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
2052 if (!is_core_symbol(src, sechdrs, shnum))
2053 continue;
2054 dst[ndst] = *src;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002055 dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
Jan Beulich4a496222009-07-06 14:50:42 +01002056 ++ndst;
2057 }
2058 mod->core_num_syms = ndst;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002059
2060 mod->core_strtab = s = mod->module_core + stroffs;
2061 for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
2062 if (test_bit(i, strmap))
2063 *++s = mod->strtab[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002064}
2065#else
Jan Beulich4a496222009-07-06 14:50:42 +01002066static inline unsigned long layout_symtab(struct module *mod,
2067 Elf_Shdr *sechdrs,
2068 unsigned int symindex,
Jan Beulich554bdfe2009-07-06 14:51:44 +01002069 unsigned int strindex,
Paul Mundt3ae91c22009-10-01 15:43:54 -07002070 const Elf_Ehdr *hdr,
Jan Beulich554bdfe2009-07-06 14:51:44 +01002071 const char *secstrings,
2072 unsigned long *pstroffs,
2073 unsigned long *strmap)
Jan Beulich4a496222009-07-06 14:50:42 +01002074{
Paul Mundt3ae91c22009-10-01 15:43:54 -07002075 return 0;
Jan Beulich4a496222009-07-06 14:50:42 +01002076}
Paul Mundt3ae91c22009-10-01 15:43:54 -07002077
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078static inline void add_kallsyms(struct module *mod,
2079 Elf_Shdr *sechdrs,
Jan Beulich4a496222009-07-06 14:50:42 +01002080 unsigned int shnum,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081 unsigned int symindex,
2082 unsigned int strindex,
Jan Beulich4a496222009-07-06 14:50:42 +01002083 unsigned long symoffs,
Jan Beulich554bdfe2009-07-06 14:51:44 +01002084 unsigned long stroffs,
2085 const char *secstrings,
2086 const unsigned long *strmap)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087{
2088}
2089#endif /* CONFIG_KALLSYMS */
2090
Jason Barone9d376f2009-02-05 11:51:38 -05002091static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
Rusty Russell5e458cc2008-10-22 10:00:13 -05002092{
Jason Barone9d376f2009-02-05 11:51:38 -05002093#ifdef CONFIG_DYNAMIC_DEBUG
2094 if (ddebug_add_module(debug, num, debug->modname))
2095 printk(KERN_ERR "dynamic debug error adding module: %s\n",
2096 debug->modname);
2097#endif
Rusty Russell5e458cc2008-10-22 10:00:13 -05002098}
Jason Baron346e15b2008-08-12 16:46:19 -04002099
Yehuda Sadehff49d742010-07-03 13:07:35 +10002100static void dynamic_debug_remove(struct _ddebug *debug)
2101{
2102 if (debug)
2103 ddebug_remove_module(debug->modname);
2104}
2105
Rusty Russell3a642e92008-07-22 19:24:28 -05002106static void *module_alloc_update_bounds(unsigned long size)
2107{
2108 void *ret = module_alloc(size);
2109
2110 if (ret) {
Rusty Russell75676502010-06-05 11:17:36 -06002111 mutex_lock(&module_mutex);
Rusty Russell3a642e92008-07-22 19:24:28 -05002112 /* Update module bounds. */
2113 if ((unsigned long)ret < module_addr_min)
2114 module_addr_min = (unsigned long)ret;
2115 if ((unsigned long)ret + size > module_addr_max)
2116 module_addr_max = (unsigned long)ret + size;
Rusty Russell75676502010-06-05 11:17:36 -06002117 mutex_unlock(&module_mutex);
Rusty Russell3a642e92008-07-22 19:24:28 -05002118 }
2119 return ret;
2120}
2121
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002122#ifdef CONFIG_DEBUG_KMEMLEAK
2123static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002124 const Elf_Shdr *sechdrs,
2125 const char *secstrings)
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002126{
2127 unsigned int i;
2128
2129 /* only scan the sections containing data */
Catalin Marinasc017b4b2009-10-28 13:33:09 +00002130 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002131
2132 for (i = 1; i < hdr->e_shnum; i++) {
2133 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2134 continue;
2135 if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
2136 && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
2137 continue;
2138
Catalin Marinasc017b4b2009-10-28 13:33:09 +00002139 kmemleak_scan_area((void *)sechdrs[i].sh_addr,
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002140 sechdrs[i].sh_size, GFP_KERNEL);
2141 }
2142}
2143#else
2144static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002145 Elf_Shdr *sechdrs,
2146 const char *secstrings)
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002147{
2148}
2149#endif
2150
Rusty Russell40dd2562010-08-05 12:59:03 -06002151static int copy_and_check(Elf_Ehdr **hdrp,
2152 const void __user *umod, unsigned long len)
2153{
2154 int err;
2155 Elf_Ehdr *hdr;
2156
2157 if (len < sizeof(*hdr))
2158 return -ENOEXEC;
2159
2160 /* Suck in entire file: we'll want most of it. */
2161 /* vmalloc barfs on "unusual" numbers. Check here */
2162 if (len > 64 * 1024 * 1024 || (hdr = *hdrp = vmalloc(len)) == NULL)
2163 return -ENOMEM;
2164
2165 if (copy_from_user(hdr, umod, len) != 0) {
2166 err = -EFAULT;
2167 goto free_hdr;
2168 }
2169
2170 /* Sanity checks against insmoding binaries or wrong arch,
2171 weird elf version */
2172 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
2173 || hdr->e_type != ET_REL
2174 || !elf_check_arch(hdr)
2175 || hdr->e_shentsize != sizeof(Elf_Shdr)) {
2176 err = -ENOEXEC;
2177 goto free_hdr;
2178 }
2179
2180 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
2181 err = -ENOEXEC;
2182 goto free_hdr;
2183 }
2184 return 0;
2185
2186free_hdr:
2187 vfree(hdr);
2188 return err;
2189}
2190
2191static int check_modinfo(struct module *mod,
2192 const Elf_Shdr *sechdrs,
2193 unsigned int infoindex, unsigned int versindex)
2194{
2195 const char *modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2196 int err;
2197
2198 /* This is allowed: modprobe --force will invalidate it. */
2199 if (!modmagic) {
2200 err = try_to_force_load(mod, "bad vermagic");
2201 if (err)
2202 return err;
2203 } else if (!same_magic(modmagic, vermagic, versindex)) {
2204 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2205 mod->name, modmagic, vermagic);
2206 return -ENOEXEC;
2207 }
2208
2209 if (get_modinfo(sechdrs, infoindex, "staging")) {
2210 add_taint_module(mod, TAINT_CRAP);
2211 printk(KERN_WARNING "%s: module is from the staging directory,"
2212 " the quality is unknown, you have been warned.\n",
2213 mod->name);
2214 }
Rusty Russell22e268e2010-08-05 12:59:05 -06002215
2216 /* Set up license info based on the info section */
2217 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2218
Rusty Russell40dd2562010-08-05 12:59:03 -06002219 return 0;
2220}
2221
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002222static void find_module_sections(struct module *mod, Elf_Ehdr *hdr,
2223 Elf_Shdr *sechdrs, const char *secstrings)
2224{
2225 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2226 sizeof(*mod->kp), &mod->num_kp);
2227 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2228 sizeof(*mod->syms), &mod->num_syms);
2229 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2230 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2231 sizeof(*mod->gpl_syms),
2232 &mod->num_gpl_syms);
2233 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2234 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2235 "__ksymtab_gpl_future",
2236 sizeof(*mod->gpl_future_syms),
2237 &mod->num_gpl_future_syms);
2238 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2239 "__kcrctab_gpl_future");
2240
2241#ifdef CONFIG_UNUSED_SYMBOLS
2242 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2243 "__ksymtab_unused",
2244 sizeof(*mod->unused_syms),
2245 &mod->num_unused_syms);
2246 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2247 "__kcrctab_unused");
2248 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2249 "__ksymtab_unused_gpl",
2250 sizeof(*mod->unused_gpl_syms),
2251 &mod->num_unused_gpl_syms);
2252 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2253 "__kcrctab_unused_gpl");
2254#endif
2255#ifdef CONFIG_CONSTRUCTORS
2256 mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
2257 sizeof(*mod->ctors), &mod->num_ctors);
2258#endif
2259
2260#ifdef CONFIG_TRACEPOINTS
2261 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2262 "__tracepoints",
2263 sizeof(*mod->tracepoints),
2264 &mod->num_tracepoints);
2265#endif
2266#ifdef CONFIG_EVENT_TRACING
2267 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2268 "_ftrace_events",
2269 sizeof(*mod->trace_events),
2270 &mod->num_trace_events);
2271 /*
2272 * This section contains pointers to allocated objects in the trace
2273 * code and not scanning it leads to false positives.
2274 */
2275 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2276 mod->num_trace_events, GFP_KERNEL);
2277#endif
2278#ifdef CONFIG_FTRACE_MCOUNT_RECORD
2279 /* sechdrs[0].sh_size is always zero */
2280 mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
2281 "__mcount_loc",
2282 sizeof(*mod->ftrace_callsites),
2283 &mod->num_ftrace_callsites);
2284#endif
Rusty Russell22e268e2010-08-05 12:59:05 -06002285
2286 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2287 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2288 mod->name);
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002289}
2290
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002291static struct module *move_module(struct module *mod,
2292 Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
2293 const char *secstrings, unsigned modindex)
2294{
2295 int i;
2296 void *ptr;
2297
2298 /* Do the allocs. */
2299 ptr = module_alloc_update_bounds(mod->core_size);
2300 /*
2301 * The pointer to this block is stored in the module structure
2302 * which is inside the block. Just mark it as not being a
2303 * leak.
2304 */
2305 kmemleak_not_leak(ptr);
2306 if (!ptr)
2307 return ERR_PTR(-ENOMEM);
2308
2309 memset(ptr, 0, mod->core_size);
2310 mod->module_core = ptr;
2311
2312 ptr = module_alloc_update_bounds(mod->init_size);
2313 /*
2314 * The pointer to this block is stored in the module structure
2315 * which is inside the block. This block doesn't need to be
2316 * scanned as it contains data and code that will be freed
2317 * after the module is initialized.
2318 */
2319 kmemleak_ignore(ptr);
2320 if (!ptr && mod->init_size) {
2321 module_free(mod, mod->module_core);
2322 return ERR_PTR(-ENOMEM);
2323 }
2324 memset(ptr, 0, mod->init_size);
2325 mod->module_init = ptr;
2326
2327 /* Transfer each section which specifies SHF_ALLOC */
2328 DEBUGP("final section addresses:\n");
2329 for (i = 0; i < hdr->e_shnum; i++) {
2330 void *dest;
2331
2332 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2333 continue;
2334
2335 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2336 dest = mod->module_init
2337 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2338 else
2339 dest = mod->module_core + sechdrs[i].sh_entsize;
2340
2341 if (sechdrs[i].sh_type != SHT_NOBITS)
2342 memcpy(dest, (void *)sechdrs[i].sh_addr,
2343 sechdrs[i].sh_size);
2344 /* Update sh_addr to point to copy in image. */
2345 sechdrs[i].sh_addr = (unsigned long)dest;
2346 DEBUGP("\t0x%lx %s\n",
2347 sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2348 }
2349 /* Module has been moved. */
2350 mod = (void *)sechdrs[modindex].sh_addr;
2351 kmemleak_load_module(mod, hdr, sechdrs, secstrings);
2352 return mod;
2353}
2354
Rusty Russell22e268e2010-08-05 12:59:05 -06002355static int check_module_license_and_versions(struct module *mod,
2356 Elf_Shdr *sechdrs)
2357{
2358 /*
2359 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2360 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2361 * using GPL-only symbols it needs.
2362 */
2363 if (strcmp(mod->name, "ndiswrapper") == 0)
2364 add_taint(TAINT_PROPRIETARY_MODULE);
2365
2366 /* driverloader was caught wrongly pretending to be under GPL */
2367 if (strcmp(mod->name, "driverloader") == 0)
2368 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2369
2370#ifdef CONFIG_MODVERSIONS
2371 if ((mod->num_syms && !mod->crcs)
2372 || (mod->num_gpl_syms && !mod->gpl_crcs)
2373 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2374#ifdef CONFIG_UNUSED_SYMBOLS
2375 || (mod->num_unused_syms && !mod->unused_crcs)
2376 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2377#endif
2378 ) {
2379 return try_to_force_load(mod,
2380 "no versions for exported symbols");
2381 }
2382#endif
2383 return 0;
2384}
2385
2386static void flush_module_icache(const struct module *mod)
2387{
2388 mm_segment_t old_fs;
2389
2390 /* flush the icache in correct context */
2391 old_fs = get_fs();
2392 set_fs(KERNEL_DS);
2393
2394 /*
2395 * Flush the instruction cache, since we've played with text.
2396 * Do it before processing of module parameters, so the module
2397 * can provide parameter accessor functions of its own.
2398 */
2399 if (mod->module_init)
2400 flush_icache_range((unsigned long)mod->module_init,
2401 (unsigned long)mod->module_init
2402 + mod->init_size);
2403 flush_icache_range((unsigned long)mod->module_core,
2404 (unsigned long)mod->module_core + mod->core_size);
2405
2406 set_fs(old_fs);
2407}
2408
Linus Torvalds1da177e2005-04-16 15:20:36 -07002409/* Allocate and load the module: note that size of section 0 is always
2410 zero, and we rely on this for optional sections. */
Linus Torvaldsffb4ba72008-08-25 11:10:26 -07002411static noinline struct module *load_module(void __user *umod,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002412 unsigned long len,
2413 const char __user *uargs)
2414{
2415 Elf_Ehdr *hdr;
2416 Elf_Shdr *sechdrs;
Rusty Russell40dd2562010-08-05 12:59:03 -06002417 char *secstrings, *args, *strtab = NULL;
Andrew Morton84860f92006-06-28 04:26:46 -07002418 unsigned int i;
2419 unsigned int symindex = 0;
2420 unsigned int strindex = 0;
Rusty Russell5e458cc2008-10-22 10:00:13 -05002421 unsigned int modindex, versindex, infoindex, pcpuindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002422 struct module *mod;
Rusty Russell40dd2562010-08-05 12:59:03 -06002423 long err;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002424 unsigned long symoffs, stroffs, *strmap;
Rusty Russell293a7cf2010-05-31 19:53:50 +09302425 void __percpu *percpu;
Yehuda Sadehff49d742010-07-03 13:07:35 +10002426 struct _ddebug *debug = NULL;
2427 unsigned int num_debug = 0;
Paul Mundt3ae91c22009-10-01 15:43:54 -07002428
Linus Torvalds1da177e2005-04-16 15:20:36 -07002429 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
2430 umod, len, uargs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431
Rusty Russell40dd2562010-08-05 12:59:03 -06002432 err = copy_and_check(&hdr, umod, len);
2433 if (err)
2434 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002435
2436 /* Convenience variables */
2437 sechdrs = (void *)hdr + hdr->e_shoff;
2438 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
2439 sechdrs[0].sh_addr = 0;
2440
2441 for (i = 1; i < hdr->e_shnum; i++) {
2442 if (sechdrs[i].sh_type != SHT_NOBITS
2443 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
2444 goto truncated;
2445
2446 /* Mark all sections sh_addr with their address in the
2447 temporary image. */
2448 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
2449
2450 /* Internal symbols and strings. */
2451 if (sechdrs[i].sh_type == SHT_SYMTAB) {
2452 symindex = i;
2453 strindex = sechdrs[i].sh_link;
2454 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
2455 }
2456#ifndef CONFIG_MODULE_UNLOAD
2457 /* Don't load .exit sections */
Rusty Russell49502672009-03-31 13:05:36 -06002458 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002459 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
2460#endif
2461 }
2462
2463 modindex = find_sec(hdr, sechdrs, secstrings,
2464 ".gnu.linkonce.this_module");
2465 if (!modindex) {
2466 printk(KERN_WARNING "No module found in object\n");
2467 err = -ENOEXEC;
2468 goto free_hdr;
2469 }
Rusty Russell5e458cc2008-10-22 10:00:13 -05002470 /* This is temporary: point mod into copy of data. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002471 mod = (void *)sechdrs[modindex].sh_addr;
2472
2473 if (symindex == 0) {
2474 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2475 mod->name);
2476 err = -ENOEXEC;
2477 goto free_hdr;
2478 }
2479
Linus Torvalds1da177e2005-04-16 15:20:36 -07002480 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
2481 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
2482 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
2483
Rusty Russellea01e792008-03-13 09:02:17 +00002484 /* Don't keep modinfo and version sections. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002485 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
Rusty Russellea01e792008-03-13 09:02:17 +00002486 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002487
2488 /* Check module struct version now, before we try to use module. */
2489 if (!check_modstruct_version(sechdrs, versindex, mod)) {
2490 err = -ENOEXEC;
2491 goto free_hdr;
2492 }
2493
Rusty Russell40dd2562010-08-05 12:59:03 -06002494 err = check_modinfo(mod, sechdrs, infoindex, versindex);
2495 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002496 goto free_hdr;
Greg Kroah-Hartman061b1bd2008-09-24 14:46:44 -07002497
Linus Torvalds1da177e2005-04-16 15:20:36 -07002498 /* Now copy in args */
Davi Arnaut24277dd2006-03-24 03:18:43 -08002499 args = strndup_user(uargs, ~0UL >> 1);
2500 if (IS_ERR(args)) {
2501 err = PTR_ERR(args);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002502 goto free_hdr;
2503 }
Andrew Morton8e08b752006-02-07 12:58:45 -08002504
Jan Beulich554bdfe2009-07-06 14:51:44 +01002505 strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
2506 * sizeof(long), GFP_KERNEL);
2507 if (!strmap) {
2508 err = -ENOMEM;
2509 goto free_mod;
2510 }
2511
Linus Torvalds1da177e2005-04-16 15:20:36 -07002512 mod->state = MODULE_STATE_COMING;
2513
2514 /* Allow arches to frob section contents and sizes. */
2515 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2516 if (err < 0)
2517 goto free_mod;
2518
2519 if (pcpuindex) {
2520 /* We have a special allocation for this section. */
Tejun Heo259354d2010-03-10 18:56:10 +09002521 err = percpu_modalloc(mod, sechdrs[pcpuindex].sh_size,
2522 sechdrs[pcpuindex].sh_addralign);
2523 if (err)
Masami Hiramatsu6e2b7572009-03-16 18:13:36 -04002524 goto free_mod;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002525 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002526 }
Rusty Russell293a7cf2010-05-31 19:53:50 +09302527 /* Keep this around for failure path. */
2528 percpu = mod_percpu(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002529
2530 /* Determine total sizes, and put offsets in sh_entsize. For now
2531 this is done generically; there doesn't appear to be any
2532 special cases for the architectures. */
2533 layout_sections(mod, hdr, sechdrs, secstrings);
Jan Beulich554bdfe2009-07-06 14:51:44 +01002534 symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
2535 secstrings, &stroffs, strmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002536
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002537 /* Allocate and move to the final place */
2538 mod = move_module(mod, hdr, sechdrs, secstrings, modindex);
2539 if (IS_ERR(mod)) {
2540 err = PTR_ERR(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002541 goto free_percpu;
2542 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002543
2544 /* Now we've moved module, initialize linked lists, etc. */
Rusty Russell9f85a4b2010-08-05 12:59:04 -06002545 err = module_unload_init(mod);
2546 if (err)
2547 goto free_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002548
Rusty Russell22e268e2010-08-05 12:59:05 -06002549 /* Now we've got everything in the final locations, we can
2550 * find optional sections. */
2551 find_module_sections(mod, hdr, sechdrs, secstrings);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002552
Rusty Russell22e268e2010-08-05 12:59:05 -06002553 err = check_module_license_and_versions(mod, sechdrs);
2554 if (err)
2555 goto free_unload;
Dave Jones9841d61d2006-01-08 01:03:41 -08002556
Matt Domschc988d2b2005-06-23 22:05:15 -07002557 /* Set up MODINFO_ATTR fields */
2558 setup_modinfo(mod, sechdrs, infoindex);
Matt Domschc988d2b2005-06-23 22:05:15 -07002559
Linus Torvalds1da177e2005-04-16 15:20:36 -07002560 /* Fix up syms, so that st_value is a pointer to location. */
2561 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2562 mod);
2563 if (err < 0)
2564 goto cleanup;
2565
Rusty Russell22e268e2010-08-05 12:59:05 -06002566 err = apply_relocations(mod, hdr, sechdrs, symindex, strindex);
2567 if (err < 0)
2568 goto cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002569
2570 /* Set up and sort exception table */
Rusty Russell5e458cc2008-10-22 10:00:13 -05002571 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2572 sizeof(*mod->extable), &mod->num_exentries);
2573 sort_extable(mod->extable, mod->extable + mod->num_exentries);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002574
2575 /* Finally, copy percpu area over. */
Tejun Heo259354d2010-03-10 18:56:10 +09002576 percpu_modcopy(mod, (void *)sechdrs[pcpuindex].sh_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002577 sechdrs[pcpuindex].sh_size);
2578
Jan Beulich4a496222009-07-06 14:50:42 +01002579 add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
Jan Beulich554bdfe2009-07-06 14:51:44 +01002580 symoffs, stroffs, secstrings, strmap);
2581 kfree(strmap);
2582 strmap = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002583
Yehuda Sadehff49d742010-07-03 13:07:35 +10002584 if (!mod->taints)
Rusty Russell5e458cc2008-10-22 10:00:13 -05002585 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2586 sizeof(*debug), &num_debug);
Steven Rostedt90d595f2008-08-14 15:45:09 -04002587
Linus Torvalds1da177e2005-04-16 15:20:36 -07002588 err = module_finalize(hdr, sechdrs, mod);
2589 if (err < 0)
2590 goto cleanup;
2591
Rusty Russell22e268e2010-08-05 12:59:05 -06002592 flush_module_icache(mod);
Thomas Koeller378bac82005-09-06 15:17:11 -07002593
Linus Torvalds1da177e2005-04-16 15:20:36 -07002594 mod->args = args;
Rusty Russell8d3b33f2006-03-25 03:07:05 -08002595
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002596 /* Now sew it into the lists so we can get lockdep and oops
Andi Kleend72b3752008-08-30 10:09:00 +02002597 * info during argument parsing. Noone should access us, since
2598 * strong_try_module_get() will fail.
2599 * lockdep/oops can run asynchronous, so use the RCU list insertion
2600 * function to insert in a way safe to concurrent readers.
2601 * The mutex protects against concurrent writers.
2602 */
Rusty Russell75676502010-06-05 11:17:36 -06002603 mutex_lock(&module_mutex);
Linus Torvalds3bafeb62010-06-05 11:17:36 -06002604 if (find_module(mod->name)) {
2605 err = -EEXIST;
Rusty Russellbe593f42010-06-05 11:17:37 -06002606 goto unlock;
Linus Torvalds3bafeb62010-06-05 11:17:36 -06002607 }
2608
Yehuda Sadehff49d742010-07-03 13:07:35 +10002609 if (debug)
2610 dynamic_debug_setup(debug, num_debug);
2611
Rusty Russellbe593f42010-06-05 11:17:37 -06002612 /* Find duplicate symbols */
2613 err = verify_export_symbols(mod);
2614 if (err < 0)
Yehuda Sadehff49d742010-07-03 13:07:35 +10002615 goto ddebug;
Rusty Russellbe593f42010-06-05 11:17:37 -06002616
Andi Kleend72b3752008-08-30 10:09:00 +02002617 list_add_rcu(&mod->list, &modules);
Rusty Russell75676502010-06-05 11:17:36 -06002618 mutex_unlock(&module_mutex);
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002619
Rusty Russelle180a6b2009-03-31 13:05:29 -06002620 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002621 if (err < 0)
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002622 goto unlink;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002623
Rusty Russelle180a6b2009-03-31 13:05:29 -06002624 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002625 if (err < 0)
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002626 goto unlink;
Rusty Russell80a3d1b2010-06-05 11:17:36 -06002627
Linus Torvalds1da177e2005-04-16 15:20:36 -07002628 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
Roland McGrath6d760132007-10-16 23:26:40 -07002629 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002630
2631 /* Get rid of temporary copy */
2632 vfree(hdr);
2633
Li Zefan7ead8b82009-08-17 16:56:28 +08002634 trace_module_load(mod);
2635
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636 /* Done! */
2637 return mod;
2638
Rusty Russellbb9d3d52008-01-29 17:13:21 -05002639 unlink:
Rusty Russell75676502010-06-05 11:17:36 -06002640 mutex_lock(&module_mutex);
Rusty Russelle91defa2009-03-31 13:05:35 -06002641 /* Unlink carefully: kallsyms could be walking list. */
2642 list_del_rcu(&mod->list);
Yehuda Sadehff49d742010-07-03 13:07:35 +10002643 ddebug:
2644 dynamic_debug_remove(debug);
Rusty Russellbe593f42010-06-05 11:17:37 -06002645 unlock:
Rusty Russell75676502010-06-05 11:17:36 -06002646 mutex_unlock(&module_mutex);
Rusty Russelle91defa2009-03-31 13:05:35 -06002647 synchronize_sched();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002648 module_arch_cleanup(mod);
2649 cleanup:
Rusty Russella263f772009-09-25 00:32:58 -06002650 free_modinfo(mod);
Rusty Russell22e268e2010-08-05 12:59:05 -06002651 free_unload:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002652 module_unload_free(mod);
Rusty Russellffa9f122009-09-25 00:32:59 -06002653 free_init:
Masami Hiramatsu6e2b7572009-03-16 18:13:36 -04002654 module_free(mod, mod->module_init);
Masami Hiramatsu6e2b7572009-03-16 18:13:36 -04002655 module_free(mod, mod->module_core);
2656 /* mod will be freed with core. Don't access it beyond this line! */
2657 free_percpu:
Rusty Russell293a7cf2010-05-31 19:53:50 +09302658 free_percpu(percpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002659 free_mod:
2660 kfree(args);
Jan Beulich554bdfe2009-07-06 14:51:44 +01002661 kfree(strmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662 free_hdr:
2663 vfree(hdr);
Jayachandran C6fe2e702006-01-06 00:19:54 -08002664 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002665
2666 truncated:
2667 printk(KERN_ERR "Module len %lu truncated\n", len);
2668 err = -ENOEXEC;
2669 goto free_hdr;
2670}
2671
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07002672/* Call module constructors. */
2673static void do_mod_ctors(struct module *mod)
2674{
2675#ifdef CONFIG_CONSTRUCTORS
2676 unsigned long i;
2677
2678 for (i = 0; i < mod->num_ctors; i++)
2679 mod->ctors[i]();
2680#endif
2681}
2682
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683/* This is where the real work happens */
Heiko Carstens17da2bd2009-01-14 14:14:10 +01002684SYSCALL_DEFINE3(init_module, void __user *, umod,
2685 unsigned long, len, const char __user *, uargs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002686{
2687 struct module *mod;
2688 int ret = 0;
2689
2690 /* Must have permission */
Kees Cook3d433212009-04-02 15:49:29 -07002691 if (!capable(CAP_SYS_MODULE) || modules_disabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002692 return -EPERM;
2693
Linus Torvalds1da177e2005-04-16 15:20:36 -07002694 /* Do all the hard work */
2695 mod = load_module(umod, len, uargs);
Rusty Russell75676502010-06-05 11:17:36 -06002696 if (IS_ERR(mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002697 return PTR_ERR(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002698
Alan Sterne041c682006-03-27 01:16:30 -08002699 blocking_notifier_call_chain(&module_notify_list,
2700 MODULE_STATE_COMING, mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002701
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07002702 do_mod_ctors(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002703 /* Start the module */
2704 if (mod->init != NULL)
Arjan van de Ven59f94152008-07-30 12:49:02 -07002705 ret = do_one_initcall(mod->init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002706 if (ret < 0) {
2707 /* Init routine failed: abort. Try to protect us from
2708 buggy refcounters. */
2709 mod->state = MODULE_STATE_GOING;
Paul E. McKenneyfbd568a3e2005-05-01 08:59:04 -07002710 synchronize_sched();
Rusty Russellaf49d922007-10-16 23:26:27 -07002711 module_put(mod);
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +02002712 blocking_notifier_call_chain(&module_notify_list,
2713 MODULE_STATE_GOING, mod);
Rusty Russellaf49d922007-10-16 23:26:27 -07002714 free_module(mod);
Rusty Russellc9a3ba52008-01-29 17:13:18 -05002715 wake_up(&module_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002716 return ret;
2717 }
Alexey Dobriyane24e2e62008-03-10 11:43:53 -07002718 if (ret > 0) {
Joe Perchesad361c92009-07-06 13:05:40 -07002719 printk(KERN_WARNING
2720"%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2721"%s: loading module anyway...\n",
Alexey Dobriyane24e2e62008-03-10 11:43:53 -07002722 __func__, mod->name, ret,
2723 __func__);
2724 dump_stack();
2725 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002726
Rusty Russell6c5db222008-03-10 11:43:52 -07002727 /* Now it's a first class citizen! Wake up anyone waiting for it. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002728 mod->state = MODULE_STATE_LIVE;
Rusty Russell6c5db222008-03-10 11:43:52 -07002729 wake_up(&module_wq);
Masami Hiramatsu0deddf432009-01-06 14:41:54 -08002730 blocking_notifier_call_chain(&module_notify_list,
2731 MODULE_STATE_LIVE, mod);
Rusty Russell6c5db222008-03-10 11:43:52 -07002732
Linus Torvaldsd6de2c82009-04-10 12:17:41 -07002733 /* We need to finish all async code before the module init sequence is done */
2734 async_synchronize_full();
2735
Rusty Russell6c5db222008-03-10 11:43:52 -07002736 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002737 /* Drop initial reference. */
2738 module_put(mod);
Rusty Russellad6561d2009-06-12 21:47:03 -06002739 trim_init_extable(mod);
Jan Beulich4a496222009-07-06 14:50:42 +01002740#ifdef CONFIG_KALLSYMS
2741 mod->num_symtab = mod->core_num_syms;
2742 mod->symtab = mod->core_symtab;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002743 mod->strtab = mod->core_strtab;
Jan Beulich4a496222009-07-06 14:50:42 +01002744#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002745 module_free(mod, mod->module_init);
2746 mod->module_init = NULL;
2747 mod->init_size = 0;
2748 mod->init_text_size = 0;
Ashutosh Naik6389a382006-03-23 03:00:46 -08002749 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002750
2751 return 0;
2752}
2753
2754static inline int within(unsigned long addr, void *start, unsigned long size)
2755{
2756 return ((void *)addr >= start && (void *)addr < start + size);
2757}
2758
2759#ifdef CONFIG_KALLSYMS
2760/*
2761 * This ignores the intensely annoying "mapping symbols" found
2762 * in ARM ELF files: $a, $t and $d.
2763 */
2764static inline int is_arm_mapping_symbol(const char *str)
2765{
Daniel Walker22a8bde2007-10-18 03:06:07 -07002766 return str[0] == '$' && strchr("atd", str[1])
Linus Torvalds1da177e2005-04-16 15:20:36 -07002767 && (str[2] == '\0' || str[2] == '.');
2768}
2769
2770static const char *get_ksymbol(struct module *mod,
2771 unsigned long addr,
2772 unsigned long *size,
2773 unsigned long *offset)
2774{
2775 unsigned int i, best = 0;
2776 unsigned long nextval;
2777
2778 /* At worse, next value is at end of module */
Masami Hiramatsua06f6212009-01-06 14:41:49 -08002779 if (within_module_init(addr, mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002780 nextval = (unsigned long)mod->module_init+mod->init_text_size;
Daniel Walker22a8bde2007-10-18 03:06:07 -07002781 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002782 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2783
2784 /* Scan for closest preceeding symbol, and next symbol. (ELF
Daniel Walker22a8bde2007-10-18 03:06:07 -07002785 starts real symbols at 1). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002786 for (i = 1; i < mod->num_symtab; i++) {
2787 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2788 continue;
2789
2790 /* We ignore unnamed symbols: they're uninformative
2791 * and inserted at a whim. */
2792 if (mod->symtab[i].st_value <= addr
2793 && mod->symtab[i].st_value > mod->symtab[best].st_value
2794 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2795 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2796 best = i;
2797 if (mod->symtab[i].st_value > addr
2798 && mod->symtab[i].st_value < nextval
2799 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2800 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2801 nextval = mod->symtab[i].st_value;
2802 }
2803
2804 if (!best)
2805 return NULL;
2806
Alexey Dobriyanffb45122007-05-08 00:28:41 -07002807 if (size)
2808 *size = nextval - mod->symtab[best].st_value;
2809 if (offset)
2810 *offset = addr - mod->symtab[best].st_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002811 return mod->strtab + mod->symtab[best].st_name;
2812}
2813
Rusty Russell6dd06c92008-01-29 17:13:22 -05002814/* For kallsyms to ask for address resolution. NULL means not found. Careful
2815 * not to lock to avoid deadlock on oopses, simply disable preemption. */
Andrew Morton92dfc9d2008-02-08 04:18:43 -08002816const char *module_address_lookup(unsigned long addr,
Rusty Russell6dd06c92008-01-29 17:13:22 -05002817 unsigned long *size,
2818 unsigned long *offset,
2819 char **modname,
2820 char *namebuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002821{
2822 struct module *mod;
Rusty Russellcb2a5202008-01-14 00:55:03 -08002823 const char *ret = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002824
Rusty Russellcb2a5202008-01-14 00:55:03 -08002825 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02002826 list_for_each_entry_rcu(mod, &modules, list) {
Masami Hiramatsua06f6212009-01-06 14:41:49 -08002827 if (within_module_init(addr, mod) ||
2828 within_module_core(addr, mod)) {
Franck Bui-Huuffc50892006-10-03 01:13:48 -07002829 if (modname)
2830 *modname = mod->name;
Rusty Russellcb2a5202008-01-14 00:55:03 -08002831 ret = get_ksymbol(mod, addr, size, offset);
2832 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002833 }
2834 }
Rusty Russell6dd06c92008-01-29 17:13:22 -05002835 /* Make a copy in here where it's safe */
2836 if (ret) {
2837 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2838 ret = namebuf;
2839 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08002840 preempt_enable();
Andrew Morton92dfc9d2008-02-08 04:18:43 -08002841 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002842}
2843
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07002844int lookup_module_symbol_name(unsigned long addr, char *symname)
2845{
2846 struct module *mod;
2847
Rusty Russellcb2a5202008-01-14 00:55:03 -08002848 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02002849 list_for_each_entry_rcu(mod, &modules, list) {
Masami Hiramatsua06f6212009-01-06 14:41:49 -08002850 if (within_module_init(addr, mod) ||
2851 within_module_core(addr, mod)) {
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07002852 const char *sym;
2853
2854 sym = get_ksymbol(mod, addr, NULL, NULL);
2855 if (!sym)
2856 goto out;
Tejun Heo9281ace2007-07-17 04:03:51 -07002857 strlcpy(symname, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08002858 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07002859 return 0;
2860 }
2861 }
2862out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08002863 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07002864 return -ERANGE;
2865}
2866
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002867int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2868 unsigned long *offset, char *modname, char *name)
2869{
2870 struct module *mod;
2871
Rusty Russellcb2a5202008-01-14 00:55:03 -08002872 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02002873 list_for_each_entry_rcu(mod, &modules, list) {
Masami Hiramatsua06f6212009-01-06 14:41:49 -08002874 if (within_module_init(addr, mod) ||
2875 within_module_core(addr, mod)) {
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002876 const char *sym;
2877
2878 sym = get_ksymbol(mod, addr, size, offset);
2879 if (!sym)
2880 goto out;
2881 if (modname)
Tejun Heo9281ace2007-07-17 04:03:51 -07002882 strlcpy(modname, mod->name, MODULE_NAME_LEN);
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002883 if (name)
Tejun Heo9281ace2007-07-17 04:03:51 -07002884 strlcpy(name, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08002885 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002886 return 0;
2887 }
2888 }
2889out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08002890 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07002891 return -ERANGE;
2892}
2893
Alexey Dobriyanea078902007-05-08 00:28:39 -07002894int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2895 char *name, char *module_name, int *exported)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002896{
2897 struct module *mod;
2898
Rusty Russellcb2a5202008-01-14 00:55:03 -08002899 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02002900 list_for_each_entry_rcu(mod, &modules, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002901 if (symnum < mod->num_symtab) {
2902 *value = mod->symtab[symnum].st_value;
2903 *type = mod->symtab[symnum].st_info;
Andreas Gruenbacher098c5ee2006-07-14 00:24:04 -07002904 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
Tejun Heo9281ace2007-07-17 04:03:51 -07002905 KSYM_NAME_LEN);
2906 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
Tim Abbottca4787b2009-01-05 08:40:10 -06002907 *exported = is_exported(name, *value, mod);
Rusty Russellcb2a5202008-01-14 00:55:03 -08002908 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07002909 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002910 }
2911 symnum -= mod->num_symtab;
2912 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08002913 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07002914 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002915}
2916
2917static unsigned long mod_find_symname(struct module *mod, const char *name)
2918{
2919 unsigned int i;
2920
2921 for (i = 0; i < mod->num_symtab; i++)
Keith Owens54e8ce42006-02-03 03:03:53 -08002922 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2923 mod->symtab[i].st_info != 'U')
Linus Torvalds1da177e2005-04-16 15:20:36 -07002924 return mod->symtab[i].st_value;
2925 return 0;
2926}
2927
2928/* Look for this name: can be of form module:name. */
2929unsigned long module_kallsyms_lookup_name(const char *name)
2930{
2931 struct module *mod;
2932 char *colon;
2933 unsigned long ret = 0;
2934
2935 /* Don't lock: we're in enough trouble already. */
Rusty Russellcb2a5202008-01-14 00:55:03 -08002936 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002937 if ((colon = strchr(name, ':')) != NULL) {
2938 *colon = '\0';
2939 if ((mod = find_module(name)) != NULL)
2940 ret = mod_find_symname(mod, colon+1);
2941 *colon = ':';
2942 } else {
Andi Kleend72b3752008-08-30 10:09:00 +02002943 list_for_each_entry_rcu(mod, &modules, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002944 if ((ret = mod_find_symname(mod, name)) != 0)
2945 break;
2946 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08002947 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002948 return ret;
2949}
Anders Kaseorg75a66612008-12-05 19:03:58 -05002950
2951int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2952 struct module *, unsigned long),
2953 void *data)
2954{
2955 struct module *mod;
2956 unsigned int i;
2957 int ret;
2958
2959 list_for_each_entry(mod, &modules, list) {
2960 for (i = 0; i < mod->num_symtab; i++) {
2961 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2962 mod, mod->symtab[i].st_value);
2963 if (ret != 0)
2964 return ret;
2965 }
2966 }
2967 return 0;
2968}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002969#endif /* CONFIG_KALLSYMS */
2970
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002971static char *module_flags(struct module *mod, char *buf)
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002972{
2973 int bx = 0;
2974
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002975 if (mod->taints ||
2976 mod->state == MODULE_STATE_GOING ||
2977 mod->state == MODULE_STATE_COMING) {
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002978 buf[bx++] = '(';
Andi Kleen25ddbb12008-10-15 22:01:41 -07002979 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002980 buf[bx++] = 'P';
Andi Kleen25ddbb12008-10-15 22:01:41 -07002981 if (mod->taints & (1 << TAINT_FORCED_MODULE))
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002982 buf[bx++] = 'F';
Linus Torvalds26e9a392008-10-17 09:50:12 -07002983 if (mod->taints & (1 << TAINT_CRAP))
Greg Kroah-Hartman061b1bd2008-09-24 14:46:44 -07002984 buf[bx++] = 'C';
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002985 /*
2986 * TAINT_FORCED_RMMOD: could be added.
2987 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2988 * apply to modules.
2989 */
Arjan van de Ven21aa9282008-01-25 21:08:33 +01002990
2991 /* Show a - for module-is-being-unloaded */
2992 if (mod->state == MODULE_STATE_GOING)
2993 buf[bx++] = '-';
2994 /* Show a + for module-is-being-loaded */
2995 if (mod->state == MODULE_STATE_COMING)
2996 buf[bx++] = '+';
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002997 buf[bx++] = ')';
2998 }
2999 buf[bx] = '\0';
3000
3001 return buf;
3002}
3003
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003004#ifdef CONFIG_PROC_FS
3005/* Called by the /proc file system to return a list of modules. */
3006static void *m_start(struct seq_file *m, loff_t *pos)
3007{
3008 mutex_lock(&module_mutex);
3009 return seq_list_start(&modules, *pos);
3010}
3011
3012static void *m_next(struct seq_file *m, void *p, loff_t *pos)
3013{
3014 return seq_list_next(p, &modules, pos);
3015}
3016
3017static void m_stop(struct seq_file *m, void *p)
3018{
3019 mutex_unlock(&module_mutex);
3020}
3021
Linus Torvalds1da177e2005-04-16 15:20:36 -07003022static int m_show(struct seq_file *m, void *p)
3023{
3024 struct module *mod = list_entry(p, struct module, list);
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003025 char buf[8];
3026
Denys Vlasenko2f0f2a32008-07-22 19:24:27 -05003027 seq_printf(m, "%s %u",
Linus Torvalds1da177e2005-04-16 15:20:36 -07003028 mod->name, mod->init_size + mod->core_size);
3029 print_unload_info(m, mod);
3030
3031 /* Informative for users. */
3032 seq_printf(m, " %s",
3033 mod->state == MODULE_STATE_GOING ? "Unloading":
3034 mod->state == MODULE_STATE_COMING ? "Loading":
3035 "Live");
3036 /* Used by oprofile and other similar tools. */
3037 seq_printf(m, " 0x%p", mod->module_core);
3038
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003039 /* Taints info */
3040 if (mod->taints)
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003041 seq_printf(m, " %s", module_flags(mod, buf));
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003042
Linus Torvalds1da177e2005-04-16 15:20:36 -07003043 seq_printf(m, "\n");
3044 return 0;
3045}
3046
3047/* Format: modulename size refcount deps address
3048
3049 Where refcount is a number or -, and deps is a comma-separated list
3050 of depends or -.
3051*/
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003052static const struct seq_operations modules_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003053 .start = m_start,
3054 .next = m_next,
3055 .stop = m_stop,
3056 .show = m_show
3057};
3058
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003059static int modules_open(struct inode *inode, struct file *file)
3060{
3061 return seq_open(file, &modules_op);
3062}
3063
3064static const struct file_operations proc_modules_operations = {
3065 .open = modules_open,
3066 .read = seq_read,
3067 .llseek = seq_lseek,
3068 .release = seq_release,
3069};
3070
3071static int __init proc_modules_init(void)
3072{
3073 proc_create("modules", 0, NULL, &proc_modules_operations);
3074 return 0;
3075}
3076module_init(proc_modules_init);
3077#endif
3078
Linus Torvalds1da177e2005-04-16 15:20:36 -07003079/* Given an address, look for it in the module exception tables. */
3080const struct exception_table_entry *search_module_extables(unsigned long addr)
3081{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003082 const struct exception_table_entry *e = NULL;
3083 struct module *mod;
3084
Rusty Russell24da1cb2007-07-15 23:41:46 -07003085 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003086 list_for_each_entry_rcu(mod, &modules, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003087 if (mod->num_exentries == 0)
3088 continue;
Daniel Walker22a8bde2007-10-18 03:06:07 -07003089
Linus Torvalds1da177e2005-04-16 15:20:36 -07003090 e = search_extable(mod->extable,
3091 mod->extable + mod->num_exentries - 1,
3092 addr);
3093 if (e)
3094 break;
3095 }
Rusty Russell24da1cb2007-07-15 23:41:46 -07003096 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003097
3098 /* Now, if we found one, we are running inside it now, hence
Daniel Walker22a8bde2007-10-18 03:06:07 -07003099 we cannot unload the module, hence no refcnt needed. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003100 return e;
3101}
3102
Ingo Molnar4d435f92006-07-03 00:24:24 -07003103/*
Rusty Russelle6104992009-03-31 13:05:31 -06003104 * is_module_address - is this address inside a module?
3105 * @addr: the address to check.
3106 *
3107 * See is_module_text_address() if you simply want to see if the address
3108 * is code (not data).
Ingo Molnar4d435f92006-07-03 00:24:24 -07003109 */
Rusty Russelle6104992009-03-31 13:05:31 -06003110bool is_module_address(unsigned long addr)
Ingo Molnar4d435f92006-07-03 00:24:24 -07003111{
Rusty Russelle6104992009-03-31 13:05:31 -06003112 bool ret;
Ingo Molnar4d435f92006-07-03 00:24:24 -07003113
Rusty Russell24da1cb2007-07-15 23:41:46 -07003114 preempt_disable();
Rusty Russelle6104992009-03-31 13:05:31 -06003115 ret = __module_address(addr) != NULL;
Rusty Russell24da1cb2007-07-15 23:41:46 -07003116 preempt_enable();
Ingo Molnar4d435f92006-07-03 00:24:24 -07003117
Rusty Russelle6104992009-03-31 13:05:31 -06003118 return ret;
Ingo Molnar4d435f92006-07-03 00:24:24 -07003119}
3120
Rusty Russelle6104992009-03-31 13:05:31 -06003121/*
3122 * __module_address - get the module which contains an address.
3123 * @addr: the address.
3124 *
3125 * Must be called with preempt disabled or module mutex held so that
3126 * module doesn't get freed during this.
3127 */
Linus Torvalds714f83d2009-04-05 11:04:19 -07003128struct module *__module_address(unsigned long addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003129{
3130 struct module *mod;
3131
Rusty Russell3a642e92008-07-22 19:24:28 -05003132 if (addr < module_addr_min || addr > module_addr_max)
3133 return NULL;
3134
Andi Kleend72b3752008-08-30 10:09:00 +02003135 list_for_each_entry_rcu(mod, &modules, list)
Rusty Russelle6104992009-03-31 13:05:31 -06003136 if (within_module_core(addr, mod)
3137 || within_module_init(addr, mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003138 return mod;
3139 return NULL;
3140}
Tim Abbottc6b37802008-12-05 19:03:59 -05003141EXPORT_SYMBOL_GPL(__module_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003142
Rusty Russelle6104992009-03-31 13:05:31 -06003143/*
3144 * is_module_text_address - is this address inside module code?
3145 * @addr: the address to check.
3146 *
3147 * See is_module_address() if you simply want to see if the address is
3148 * anywhere in a module. See kernel_text_address() for testing if an
3149 * address corresponds to kernel or module code.
3150 */
3151bool is_module_text_address(unsigned long addr)
3152{
3153 bool ret;
3154
3155 preempt_disable();
3156 ret = __module_text_address(addr) != NULL;
3157 preempt_enable();
3158
3159 return ret;
3160}
3161
3162/*
3163 * __module_text_address - get the module whose code contains an address.
3164 * @addr: the address.
3165 *
3166 * Must be called with preempt disabled or module mutex held so that
3167 * module doesn't get freed during this.
3168 */
3169struct module *__module_text_address(unsigned long addr)
3170{
3171 struct module *mod = __module_address(addr);
3172 if (mod) {
3173 /* Make sure it's within the text section. */
3174 if (!within(addr, mod->module_init, mod->init_text_size)
3175 && !within(addr, mod->module_core, mod->core_text_size))
3176 mod = NULL;
3177 }
3178 return mod;
3179}
Tim Abbottc6b37802008-12-05 19:03:59 -05003180EXPORT_SYMBOL_GPL(__module_text_address);
Rusty Russelle6104992009-03-31 13:05:31 -06003181
Linus Torvalds1da177e2005-04-16 15:20:36 -07003182/* Don't grab lock, we're oopsing. */
3183void print_modules(void)
3184{
3185 struct module *mod;
Randy Dunlap2bc2d612006-10-02 02:17:02 -07003186 char buf[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003187
Linus Torvaldsb2311252009-06-16 11:07:14 -07003188 printk(KERN_DEFAULT "Modules linked in:");
Andi Kleend72b3752008-08-30 10:09:00 +02003189 /* Most callers should already have preempt disabled, but make sure */
3190 preempt_disable();
3191 list_for_each_entry_rcu(mod, &modules, list)
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003192 printk(" %s%s", mod->name, module_flags(mod, buf));
Andi Kleend72b3752008-08-30 10:09:00 +02003193 preempt_enable();
Arjan van de Vene14af7e2008-01-25 21:08:33 +01003194 if (last_unloaded_module[0])
3195 printk(" [last unloaded: %s]", last_unloaded_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003196 printk("\n");
3197}
3198
Linus Torvalds1da177e2005-04-16 15:20:36 -07003199#ifdef CONFIG_MODVERSIONS
Rusty Russell8c8ef422009-03-31 13:05:34 -06003200/* Generate the signature for all relevant module structures here.
3201 * If these change, we don't want to try to parse the module. */
3202void module_layout(struct module *mod,
3203 struct modversion_info *ver,
3204 struct kernel_param *kp,
3205 struct kernel_symbol *ks,
Rusty Russell8c8ef422009-03-31 13:05:34 -06003206 struct tracepoint *tp)
3207{
3208}
3209EXPORT_SYMBOL(module_layout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003210#endif
Mathieu Desnoyers8256e472007-10-18 23:41:06 -07003211
Mathieu Desnoyers97e1c182008-07-18 12:16:16 -04003212#ifdef CONFIG_TRACEPOINTS
3213void module_update_tracepoints(void)
3214{
3215 struct module *mod;
3216
3217 mutex_lock(&module_mutex);
3218 list_for_each_entry(mod, &modules, list)
3219 if (!mod->taints)
3220 tracepoint_update_probe_range(mod->tracepoints,
3221 mod->tracepoints + mod->num_tracepoints);
3222 mutex_unlock(&module_mutex);
3223}
3224
3225/*
3226 * Returns 0 if current not found.
3227 * Returns 1 if current found.
3228 */
3229int module_get_iter_tracepoints(struct tracepoint_iter *iter)
3230{
3231 struct module *iter_mod;
3232 int found = 0;
3233
3234 mutex_lock(&module_mutex);
3235 list_for_each_entry(iter_mod, &modules, list) {
3236 if (!iter_mod->taints) {
3237 /*
3238 * Sorted module list
3239 */
3240 if (iter_mod < iter->module)
3241 continue;
3242 else if (iter_mod > iter->module)
3243 iter->tracepoint = NULL;
3244 found = tracepoint_get_iter_range(&iter->tracepoint,
3245 iter_mod->tracepoints,
3246 iter_mod->tracepoints
3247 + iter_mod->num_tracepoints);
3248 if (found) {
3249 iter->module = iter_mod;
3250 break;
3251 }
3252 }
3253 }
3254 mutex_unlock(&module_mutex);
3255 return found;
3256}
3257#endif