On Tue, Nov 06, 2007 at 02:33:53AM -0800, akpm@linux-foundation.org wrote:
[mmotm.git] / kernel / module.c
blob64787cddeb5ee34c0ffb891e711e89d4f5b71b79
1 /*
2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
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.
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.
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
19 #include <linux/module.h>
20 #include <linux/moduleloader.h>
21 #include <linux/ftrace_event.h>
22 #include <linux/init.h>
23 #include <linux/kallsyms.h>
24 #include <linux/fs.h>
25 #include <linux/sysfs.h>
26 #include <linux/kernel.h>
27 #include <linux/slab.h>
28 #include <linux/vmalloc.h>
29 #include <linux/elf.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <linux/syscalls.h>
33 #include <linux/fcntl.h>
34 #include <linux/rcupdate.h>
35 #include <linux/capability.h>
36 #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>
42 #include <linux/sched.h>
43 #include <linux/stop_machine.h>
44 #include <linux/device.h>
45 #include <linux/string.h>
46 #include <linux/mutex.h>
47 #include <linux/rculist.h>
48 #include <asm/uaccess.h>
49 #include <asm/cacheflush.h>
50 #include <asm/mmu_context.h>
51 #include <linux/license.h>
52 #include <asm/sections.h>
53 #include <linux/tracepoint.h>
54 #include <linux/ftrace.h>
55 #include <linux/async.h>
56 #include <linux/percpu.h>
57 #include <linux/kmemleak.h>
59 #define CREATE_TRACE_POINTS
60 #include <trace/events/module.h>
62 EXPORT_TRACEPOINT_SYMBOL(module_get);
64 #if 0
65 #define DEBUGP printk
66 #else
67 #define DEBUGP(fmt , a...)
68 #endif
70 #ifndef ARCH_SHF_SMALL
71 #define ARCH_SHF_SMALL 0
72 #endif
74 /* If this is set, the section belongs in the init part of the module */
75 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
77 /* List of modules, protected by module_mutex or preempt_disable
78 * (delete uses stop_machine/add uses RCU list operations). */
79 DEFINE_MUTEX(module_mutex);
80 EXPORT_SYMBOL_GPL(module_mutex);
81 static LIST_HEAD(modules);
83 /* Block module loading/unloading? */
84 int modules_disabled = 0;
86 /* Waiting for a module to finish initializing? */
87 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
89 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
91 /* Bounds of module allocation, for speeding __module_address */
92 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
94 int register_module_notifier(struct notifier_block * nb)
96 return blocking_notifier_chain_register(&module_notify_list, nb);
98 EXPORT_SYMBOL(register_module_notifier);
100 int unregister_module_notifier(struct notifier_block * nb)
102 return blocking_notifier_chain_unregister(&module_notify_list, nb);
104 EXPORT_SYMBOL(unregister_module_notifier);
106 /* We require a truly strong try_module_get(): 0 means failure due to
107 ongoing or failed initialization etc. */
108 static inline int strong_try_module_get(struct module *mod)
110 if (mod && mod->state == MODULE_STATE_COMING)
111 return -EBUSY;
112 if (try_module_get(mod))
113 return 0;
114 else
115 return -ENOENT;
118 static inline void add_taint_module(struct module *mod, unsigned flag)
120 add_taint(flag);
121 mod->taints |= (1U << flag);
125 * A thread that wants to hold a reference to a module only while it
126 * is running can call this to safely exit. nfsd and lockd use this.
128 void __module_put_and_exit(struct module *mod, long code)
130 module_put(mod);
131 do_exit(code);
133 EXPORT_SYMBOL(__module_put_and_exit);
135 /* Find a module section: 0 means not found. */
136 static unsigned int find_sec(Elf_Ehdr *hdr,
137 Elf_Shdr *sechdrs,
138 const char *secstrings,
139 const char *name)
141 unsigned int i;
143 for (i = 1; i < hdr->e_shnum; i++)
144 /* Alloc bit cleared means "ignore it." */
145 if ((sechdrs[i].sh_flags & SHF_ALLOC)
146 && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
147 return i;
148 return 0;
151 /* Find a module section, or NULL. */
152 static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
153 const char *secstrings, const char *name)
155 /* Section 0 has sh_addr 0. */
156 return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
159 /* Find a module section, or NULL. Fill in number of "objects" in section. */
160 static void *section_objs(Elf_Ehdr *hdr,
161 Elf_Shdr *sechdrs,
162 const char *secstrings,
163 const char *name,
164 size_t object_size,
165 unsigned int *num)
167 unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
169 /* Section 0 has sh_addr 0 and sh_size 0. */
170 *num = sechdrs[sec].sh_size / object_size;
171 return (void *)sechdrs[sec].sh_addr;
174 /* Provided by the linker */
175 extern const struct kernel_symbol __start___ksymtab[];
176 extern const struct kernel_symbol __stop___ksymtab[];
177 extern const struct kernel_symbol __start___ksymtab_gpl[];
178 extern const struct kernel_symbol __stop___ksymtab_gpl[];
179 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
180 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
181 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
182 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
183 extern const unsigned long __start___kcrctab[];
184 extern const unsigned long __start___kcrctab_gpl[];
185 extern const unsigned long __start___kcrctab_gpl_future[];
186 #ifdef CONFIG_UNUSED_SYMBOLS
187 extern const struct kernel_symbol __start___ksymtab_unused[];
188 extern const struct kernel_symbol __stop___ksymtab_unused[];
189 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
190 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
191 extern const unsigned long __start___kcrctab_unused[];
192 extern const unsigned long __start___kcrctab_unused_gpl[];
193 #endif
195 #ifndef CONFIG_MODVERSIONS
196 #define symversion(base, idx) NULL
197 #else
198 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
199 #endif
201 static bool each_symbol_in_section(const struct symsearch *arr,
202 unsigned int arrsize,
203 struct module *owner,
204 bool (*fn)(const struct symsearch *syms,
205 struct module *owner,
206 unsigned int symnum, void *data),
207 void *data)
209 unsigned int i, j;
211 for (j = 0; j < arrsize; j++) {
212 for (i = 0; i < arr[j].stop - arr[j].start; i++)
213 if (fn(&arr[j], owner, i, data))
214 return true;
217 return false;
220 /* Returns true as soon as fn returns true, otherwise false. */
221 bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
222 unsigned int symnum, void *data), void *data)
224 struct module *mod;
225 const struct symsearch arr[] = {
226 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
227 NOT_GPL_ONLY, false },
228 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
229 __start___kcrctab_gpl,
230 GPL_ONLY, false },
231 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
232 __start___kcrctab_gpl_future,
233 WILL_BE_GPL_ONLY, false },
234 #ifdef CONFIG_UNUSED_SYMBOLS
235 { __start___ksymtab_unused, __stop___ksymtab_unused,
236 __start___kcrctab_unused,
237 NOT_GPL_ONLY, true },
238 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
239 __start___kcrctab_unused_gpl,
240 GPL_ONLY, true },
241 #endif
244 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
245 return true;
247 list_for_each_entry_rcu(mod, &modules, list) {
248 struct symsearch arr[] = {
249 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
250 NOT_GPL_ONLY, false },
251 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
252 mod->gpl_crcs,
253 GPL_ONLY, false },
254 { mod->gpl_future_syms,
255 mod->gpl_future_syms + mod->num_gpl_future_syms,
256 mod->gpl_future_crcs,
257 WILL_BE_GPL_ONLY, false },
258 #ifdef CONFIG_UNUSED_SYMBOLS
259 { mod->unused_syms,
260 mod->unused_syms + mod->num_unused_syms,
261 mod->unused_crcs,
262 NOT_GPL_ONLY, true },
263 { mod->unused_gpl_syms,
264 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
265 mod->unused_gpl_crcs,
266 GPL_ONLY, true },
267 #endif
270 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
271 return true;
273 return false;
275 EXPORT_SYMBOL_GPL(each_symbol);
277 struct find_symbol_arg {
278 /* Input */
279 const char *name;
280 bool gplok;
281 bool warn;
283 /* Output */
284 struct module *owner;
285 const unsigned long *crc;
286 const struct kernel_symbol *sym;
289 static bool find_symbol_in_section(const struct symsearch *syms,
290 struct module *owner,
291 unsigned int symnum, void *data)
293 struct find_symbol_arg *fsa = data;
295 if (strcmp(syms->start[symnum].name, fsa->name) != 0)
296 return false;
298 if (!fsa->gplok) {
299 if (syms->licence == GPL_ONLY)
300 return false;
301 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
302 printk(KERN_WARNING "Symbol %s is being used "
303 "by a non-GPL module, which will not "
304 "be allowed in the future\n", fsa->name);
305 printk(KERN_WARNING "Please see the file "
306 "Documentation/feature-removal-schedule.txt "
307 "in the kernel source tree for more details.\n");
311 #ifdef CONFIG_UNUSED_SYMBOLS
312 if (syms->unused && fsa->warn) {
313 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
314 "however this module is using it.\n", fsa->name);
315 printk(KERN_WARNING
316 "This symbol will go away in the future.\n");
317 printk(KERN_WARNING
318 "Please evalute if this is the right api to use and if "
319 "it really is, submit a report the linux kernel "
320 "mailinglist together with submitting your code for "
321 "inclusion.\n");
323 #endif
325 fsa->owner = owner;
326 fsa->crc = symversion(syms->crcs, symnum);
327 fsa->sym = &syms->start[symnum];
328 return true;
331 /* Find a symbol and return it, along with, (optional) crc and
332 * (optional) module which owns it */
333 const struct kernel_symbol *find_symbol(const char *name,
334 struct module **owner,
335 const unsigned long **crc,
336 bool gplok,
337 bool warn)
339 struct find_symbol_arg fsa;
341 fsa.name = name;
342 fsa.gplok = gplok;
343 fsa.warn = warn;
345 if (each_symbol(find_symbol_in_section, &fsa)) {
346 if (owner)
347 *owner = fsa.owner;
348 if (crc)
349 *crc = fsa.crc;
350 return fsa.sym;
353 DEBUGP("Failed to find symbol %s\n", name);
354 return NULL;
356 EXPORT_SYMBOL_GPL(find_symbol);
358 /* Search for module by name: must hold module_mutex. */
359 struct module *find_module(const char *name)
361 struct module *mod;
363 list_for_each_entry(mod, &modules, list) {
364 if (strcmp(mod->name, name) == 0)
365 return mod;
367 return NULL;
369 EXPORT_SYMBOL_GPL(find_module);
371 #ifdef CONFIG_SMP
373 static void *percpu_modalloc(unsigned long size, unsigned long align,
374 const char *name)
376 void *ptr;
378 if (align > PAGE_SIZE) {
379 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
380 name, align, PAGE_SIZE);
381 align = PAGE_SIZE;
384 ptr = __alloc_reserved_percpu(size, align);
385 if (!ptr)
386 printk(KERN_WARNING
387 "Could not allocate %lu bytes percpu data\n", size);
388 return ptr;
391 static void percpu_modfree(void *freeme)
393 free_percpu(freeme);
396 static unsigned int find_pcpusec(Elf_Ehdr *hdr,
397 Elf_Shdr *sechdrs,
398 const char *secstrings)
400 return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
403 static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
405 int cpu;
407 for_each_possible_cpu(cpu)
408 memcpy(pcpudest + per_cpu_offset(cpu), from, size);
411 #else /* ... !CONFIG_SMP */
413 static inline void *percpu_modalloc(unsigned long size, unsigned long align,
414 const char *name)
416 return NULL;
418 static inline void percpu_modfree(void *pcpuptr)
420 BUG();
422 static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
423 Elf_Shdr *sechdrs,
424 const char *secstrings)
426 return 0;
428 static inline void percpu_modcopy(void *pcpudst, const void *src,
429 unsigned long size)
431 /* pcpusec should be 0, and size of that section should be 0. */
432 BUG_ON(size != 0);
435 #endif /* CONFIG_SMP */
437 #define MODINFO_ATTR(field) \
438 static void setup_modinfo_##field(struct module *mod, const char *s) \
440 mod->field = kstrdup(s, GFP_KERNEL); \
442 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
443 struct module *mod, char *buffer) \
445 return sprintf(buffer, "%s\n", mod->field); \
447 static int modinfo_##field##_exists(struct module *mod) \
449 return mod->field != NULL; \
451 static void free_modinfo_##field(struct module *mod) \
453 kfree(mod->field); \
454 mod->field = NULL; \
456 static struct module_attribute modinfo_##field = { \
457 .attr = { .name = __stringify(field), .mode = 0444 }, \
458 .show = show_modinfo_##field, \
459 .setup = setup_modinfo_##field, \
460 .test = modinfo_##field##_exists, \
461 .free = free_modinfo_##field, \
464 MODINFO_ATTR(version);
465 MODINFO_ATTR(srcversion);
467 static char last_unloaded_module[MODULE_NAME_LEN+1];
469 #ifdef CONFIG_MODULE_UNLOAD
470 /* Init the unload section of the module. */
471 static void module_unload_init(struct module *mod)
473 int cpu;
475 INIT_LIST_HEAD(&mod->modules_which_use_me);
476 for_each_possible_cpu(cpu)
477 local_set(__module_ref_addr(mod, cpu), 0);
478 /* Hold reference count during initialization. */
479 local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1);
480 /* Backwards compatibility macros put refcount during init. */
481 mod->waiter = current;
484 /* modules using other modules */
485 struct module_use
487 struct list_head list;
488 struct module *module_which_uses;
491 /* Does a already use b? */
492 static int already_uses(struct module *a, struct module *b)
494 struct module_use *use;
496 list_for_each_entry(use, &b->modules_which_use_me, list) {
497 if (use->module_which_uses == a) {
498 DEBUGP("%s uses %s!\n", a->name, b->name);
499 return 1;
502 DEBUGP("%s does not use %s!\n", a->name, b->name);
503 return 0;
506 /* Module a uses b */
507 int use_module(struct module *a, struct module *b)
509 struct module_use *use;
510 int no_warn, err;
512 if (b == NULL || already_uses(a, b)) return 1;
514 /* If we're interrupted or time out, we fail. */
515 if (wait_event_interruptible_timeout(
516 module_wq, (err = strong_try_module_get(b)) != -EBUSY,
517 30 * HZ) <= 0) {
518 printk("%s: gave up waiting for init of module %s.\n",
519 a->name, b->name);
520 return 0;
523 /* If strong_try_module_get() returned a different error, we fail. */
524 if (err)
525 return 0;
527 DEBUGP("Allocating new usage for %s.\n", a->name);
528 use = kmalloc(sizeof(*use), GFP_ATOMIC);
529 if (!use) {
530 printk("%s: out of memory loading\n", a->name);
531 module_put(b);
532 return 0;
535 use->module_which_uses = a;
536 list_add(&use->list, &b->modules_which_use_me);
537 no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
538 return 1;
540 EXPORT_SYMBOL_GPL(use_module);
542 /* Clear the unload stuff of the module. */
543 static void module_unload_free(struct module *mod)
545 struct module *i;
547 list_for_each_entry(i, &modules, list) {
548 struct module_use *use;
550 list_for_each_entry(use, &i->modules_which_use_me, list) {
551 if (use->module_which_uses == mod) {
552 DEBUGP("%s unusing %s\n", mod->name, i->name);
553 module_put(i);
554 list_del(&use->list);
555 kfree(use);
556 sysfs_remove_link(i->holders_dir, mod->name);
557 /* There can be at most one match. */
558 break;
564 #ifdef CONFIG_MODULE_FORCE_UNLOAD
565 static inline int try_force_unload(unsigned int flags)
567 int ret = (flags & O_TRUNC);
568 if (ret)
569 add_taint(TAINT_FORCED_RMMOD);
570 return ret;
572 #else
573 static inline int try_force_unload(unsigned int flags)
575 return 0;
577 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
579 struct stopref
581 struct module *mod;
582 int flags;
583 int *forced;
586 /* Whole machine is stopped with interrupts off when this runs. */
587 static int __try_stop_module(void *_sref)
589 struct stopref *sref = _sref;
591 /* If it's not unused, quit unless we're forcing. */
592 if (module_refcount(sref->mod) != 0) {
593 if (!(*sref->forced = try_force_unload(sref->flags)))
594 return -EWOULDBLOCK;
597 /* Mark it as dying. */
598 sref->mod->state = MODULE_STATE_GOING;
599 return 0;
602 static int try_stop_module(struct module *mod, int flags, int *forced)
604 if (flags & O_NONBLOCK) {
605 struct stopref sref = { mod, flags, forced };
607 return stop_machine(__try_stop_module, &sref, NULL);
608 } else {
609 /* We don't need to stop the machine for this. */
610 mod->state = MODULE_STATE_GOING;
611 synchronize_sched();
612 return 0;
616 unsigned int module_refcount(struct module *mod)
618 unsigned int total = 0;
619 int cpu;
621 for_each_possible_cpu(cpu)
622 total += local_read(__module_ref_addr(mod, cpu));
623 return total;
625 EXPORT_SYMBOL(module_refcount);
627 /* This exists whether we can unload or not */
628 static void free_module(struct module *mod);
630 static void wait_for_zero_refcount(struct module *mod)
632 /* Since we might sleep for some time, release the mutex first */
633 mutex_unlock(&module_mutex);
634 for (;;) {
635 DEBUGP("Looking at refcount...\n");
636 set_current_state(TASK_UNINTERRUPTIBLE);
637 if (module_refcount(mod) == 0)
638 break;
639 schedule();
641 current->state = TASK_RUNNING;
642 mutex_lock(&module_mutex);
645 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
646 unsigned int, flags)
648 struct module *mod;
649 char name[MODULE_NAME_LEN];
650 int ret, forced = 0;
652 if (!capable(CAP_SYS_MODULE) || modules_disabled)
653 return -EPERM;
655 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
656 return -EFAULT;
657 name[MODULE_NAME_LEN-1] = '\0';
659 /* Create stop_machine threads since free_module relies on
660 * a non-failing stop_machine call. */
661 ret = stop_machine_create();
662 if (ret)
663 return ret;
665 if (mutex_lock_interruptible(&module_mutex) != 0) {
666 ret = -EINTR;
667 goto out_stop;
670 mod = find_module(name);
671 if (!mod) {
672 ret = -ENOENT;
673 goto out;
676 if (!list_empty(&mod->modules_which_use_me)) {
677 /* Other modules depend on us: get rid of them first. */
678 ret = -EWOULDBLOCK;
679 goto out;
682 /* Doing init or already dying? */
683 if (mod->state != MODULE_STATE_LIVE) {
684 /* FIXME: if (force), slam module count and wake up
685 waiter --RR */
686 DEBUGP("%s already dying\n", mod->name);
687 ret = -EBUSY;
688 goto out;
691 /* If it has an init func, it must have an exit func to unload */
692 if (mod->init && !mod->exit) {
693 forced = try_force_unload(flags);
694 if (!forced) {
695 /* This module can't be removed */
696 ret = -EBUSY;
697 goto out;
701 /* Set this up before setting mod->state */
702 mod->waiter = current;
704 /* Stop the machine so refcounts can't move and disable module. */
705 ret = try_stop_module(mod, flags, &forced);
706 if (ret != 0)
707 goto out;
709 /* Never wait if forced. */
710 if (!forced && module_refcount(mod) != 0)
711 wait_for_zero_refcount(mod);
713 mutex_unlock(&module_mutex);
714 /* Final destruction now noone is using it. */
715 if (mod->exit != NULL)
716 mod->exit();
717 blocking_notifier_call_chain(&module_notify_list,
718 MODULE_STATE_GOING, mod);
719 async_synchronize_full();
720 mutex_lock(&module_mutex);
721 /* Store the name of the last unloaded module for diagnostic purposes */
722 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
723 ddebug_remove_module(mod->name);
724 free_module(mod);
726 out:
727 mutex_unlock(&module_mutex);
728 out_stop:
729 stop_machine_destroy();
730 return ret;
733 static inline void print_unload_info(struct seq_file *m, struct module *mod)
735 struct module_use *use;
736 int printed_something = 0;
738 seq_printf(m, " %u ", module_refcount(mod));
740 /* Always include a trailing , so userspace can differentiate
741 between this and the old multi-field proc format. */
742 list_for_each_entry(use, &mod->modules_which_use_me, list) {
743 printed_something = 1;
744 seq_printf(m, "%s,", use->module_which_uses->name);
747 if (mod->init != NULL && mod->exit == NULL) {
748 printed_something = 1;
749 seq_printf(m, "[permanent],");
752 if (!printed_something)
753 seq_printf(m, "-");
756 void __symbol_put(const char *symbol)
758 struct module *owner;
760 preempt_disable();
761 if (!find_symbol(symbol, &owner, NULL, true, false))
762 BUG();
763 module_put(owner);
764 preempt_enable();
766 EXPORT_SYMBOL(__symbol_put);
768 /* Note this assumes addr is a function, which it currently always is. */
769 void symbol_put_addr(void *addr)
771 struct module *modaddr;
772 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
774 if (core_kernel_text(a))
775 return;
777 /* module_text_address is safe here: we're supposed to have reference
778 * to module from symbol_get, so it can't go away. */
779 modaddr = __module_text_address(a);
780 BUG_ON(!modaddr);
781 module_put(modaddr);
783 EXPORT_SYMBOL_GPL(symbol_put_addr);
785 static ssize_t show_refcnt(struct module_attribute *mattr,
786 struct module *mod, char *buffer)
788 return sprintf(buffer, "%u\n", module_refcount(mod));
791 static struct module_attribute refcnt = {
792 .attr = { .name = "refcnt", .mode = 0444 },
793 .show = show_refcnt,
796 void module_put(struct module *module)
798 if (module) {
799 unsigned int cpu = get_cpu();
800 local_dec(__module_ref_addr(module, cpu));
801 trace_module_put(module, _RET_IP_,
802 local_read(__module_ref_addr(module, cpu)));
803 /* Maybe they're waiting for us to drop reference? */
804 if (unlikely(!module_is_live(module)))
805 wake_up_process(module->waiter);
806 put_cpu();
809 EXPORT_SYMBOL(module_put);
811 #else /* !CONFIG_MODULE_UNLOAD */
812 static inline void print_unload_info(struct seq_file *m, struct module *mod)
814 /* We don't know the usage count, or what modules are using. */
815 seq_printf(m, " - -");
818 static inline void module_unload_free(struct module *mod)
822 int use_module(struct module *a, struct module *b)
824 return strong_try_module_get(b) == 0;
826 EXPORT_SYMBOL_GPL(use_module);
828 static inline void module_unload_init(struct module *mod)
831 #endif /* CONFIG_MODULE_UNLOAD */
833 static ssize_t show_initstate(struct module_attribute *mattr,
834 struct module *mod, char *buffer)
836 const char *state = "unknown";
838 switch (mod->state) {
839 case MODULE_STATE_LIVE:
840 state = "live";
841 break;
842 case MODULE_STATE_COMING:
843 state = "coming";
844 break;
845 case MODULE_STATE_GOING:
846 state = "going";
847 break;
849 return sprintf(buffer, "%s\n", state);
852 static struct module_attribute initstate = {
853 .attr = { .name = "initstate", .mode = 0444 },
854 .show = show_initstate,
857 static struct module_attribute *modinfo_attrs[] = {
858 &modinfo_version,
859 &modinfo_srcversion,
860 &initstate,
861 #ifdef CONFIG_MODULE_UNLOAD
862 &refcnt,
863 #endif
864 NULL,
867 static const char vermagic[] = VERMAGIC_STRING;
869 static int try_to_force_load(struct module *mod, const char *reason)
871 #ifdef CONFIG_MODULE_FORCE_LOAD
872 if (!test_taint(TAINT_FORCED_MODULE))
873 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
874 mod->name, reason);
875 add_taint_module(mod, TAINT_FORCED_MODULE);
876 return 0;
877 #else
878 return -ENOEXEC;
879 #endif
882 #ifdef CONFIG_MODVERSIONS
883 static int check_version(Elf_Shdr *sechdrs,
884 unsigned int versindex,
885 const char *symname,
886 struct module *mod,
887 const unsigned long *crc)
889 unsigned int i, num_versions;
890 struct modversion_info *versions;
892 /* Exporting module didn't supply crcs? OK, we're already tainted. */
893 if (!crc)
894 return 1;
896 /* No versions at all? modprobe --force does this. */
897 if (versindex == 0)
898 return try_to_force_load(mod, symname) == 0;
900 versions = (void *) sechdrs[versindex].sh_addr;
901 num_versions = sechdrs[versindex].sh_size
902 / sizeof(struct modversion_info);
904 for (i = 0; i < num_versions; i++) {
905 if (strcmp(versions[i].name, symname) != 0)
906 continue;
908 if (versions[i].crc == *crc)
909 return 1;
910 DEBUGP("Found checksum %lX vs module %lX\n",
911 *crc, versions[i].crc);
912 goto bad_version;
915 printk(KERN_WARNING "%s: no symbol version for %s\n",
916 mod->name, symname);
917 return 0;
919 bad_version:
920 printk("%s: disagrees about version of symbol %s\n",
921 mod->name, symname);
922 return 0;
925 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
926 unsigned int versindex,
927 struct module *mod)
929 const unsigned long *crc;
931 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
932 &crc, true, false))
933 BUG();
934 return check_version(sechdrs, versindex, "module_layout", mod, crc);
937 /* First part is kernel version, which we ignore if module has crcs. */
938 static inline int same_magic(const char *amagic, const char *bmagic,
939 bool has_crcs)
941 if (has_crcs) {
942 amagic += strcspn(amagic, " ");
943 bmagic += strcspn(bmagic, " ");
945 return strcmp(amagic, bmagic) == 0;
947 #else
948 static inline int check_version(Elf_Shdr *sechdrs,
949 unsigned int versindex,
950 const char *symname,
951 struct module *mod,
952 const unsigned long *crc)
954 return 1;
957 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
958 unsigned int versindex,
959 struct module *mod)
961 return 1;
964 static inline int same_magic(const char *amagic, const char *bmagic,
965 bool has_crcs)
967 return strcmp(amagic, bmagic) == 0;
969 #endif /* CONFIG_MODVERSIONS */
971 /* Resolve a symbol for this module. I.e. if we find one, record usage.
972 Must be holding module_mutex. */
973 static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
974 unsigned int versindex,
975 const char *name,
976 struct module *mod)
978 struct module *owner;
979 const struct kernel_symbol *sym;
980 const unsigned long *crc;
982 sym = find_symbol(name, &owner, &crc,
983 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
984 /* use_module can fail due to OOM,
985 or module initialization or unloading */
986 if (sym) {
987 if (!check_version(sechdrs, versindex, name, mod, crc) ||
988 !use_module(mod, owner))
989 sym = NULL;
991 return sym;
995 * /sys/module/foo/sections stuff
996 * J. Corbet <corbet@lwn.net>
998 #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
999 struct module_sect_attr
1001 struct module_attribute mattr;
1002 char *name;
1003 unsigned long address;
1006 struct module_sect_attrs
1008 struct attribute_group grp;
1009 unsigned int nsections;
1010 struct module_sect_attr attrs[0];
1013 static ssize_t module_sect_show(struct module_attribute *mattr,
1014 struct module *mod, char *buf)
1016 struct module_sect_attr *sattr =
1017 container_of(mattr, struct module_sect_attr, mattr);
1018 return sprintf(buf, "0x%lx\n", sattr->address);
1021 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1023 unsigned int section;
1025 for (section = 0; section < sect_attrs->nsections; section++)
1026 kfree(sect_attrs->attrs[section].name);
1027 kfree(sect_attrs);
1030 static void add_sect_attrs(struct module *mod, unsigned int nsect,
1031 char *secstrings, Elf_Shdr *sechdrs)
1033 unsigned int nloaded = 0, i, size[2];
1034 struct module_sect_attrs *sect_attrs;
1035 struct module_sect_attr *sattr;
1036 struct attribute **gattr;
1038 /* Count loaded sections and allocate structures */
1039 for (i = 0; i < nsect; i++)
1040 if (sechdrs[i].sh_flags & SHF_ALLOC)
1041 nloaded++;
1042 size[0] = ALIGN(sizeof(*sect_attrs)
1043 + nloaded * sizeof(sect_attrs->attrs[0]),
1044 sizeof(sect_attrs->grp.attrs[0]));
1045 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1046 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1047 if (sect_attrs == NULL)
1048 return;
1050 /* Setup section attributes. */
1051 sect_attrs->grp.name = "sections";
1052 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1054 sect_attrs->nsections = 0;
1055 sattr = &sect_attrs->attrs[0];
1056 gattr = &sect_attrs->grp.attrs[0];
1057 for (i = 0; i < nsect; i++) {
1058 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
1059 continue;
1060 sattr->address = sechdrs[i].sh_addr;
1061 sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
1062 GFP_KERNEL);
1063 if (sattr->name == NULL)
1064 goto out;
1065 sect_attrs->nsections++;
1066 sattr->mattr.show = module_sect_show;
1067 sattr->mattr.store = NULL;
1068 sattr->mattr.attr.name = sattr->name;
1069 sattr->mattr.attr.mode = S_IRUGO;
1070 *(gattr++) = &(sattr++)->mattr.attr;
1072 *gattr = NULL;
1074 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
1075 goto out;
1077 mod->sect_attrs = sect_attrs;
1078 return;
1079 out:
1080 free_sect_attrs(sect_attrs);
1083 static void remove_sect_attrs(struct module *mod)
1085 if (mod->sect_attrs) {
1086 sysfs_remove_group(&mod->mkobj.kobj,
1087 &mod->sect_attrs->grp);
1088 /* We are positive that no one is using any sect attrs
1089 * at this point. Deallocate immediately. */
1090 free_sect_attrs(mod->sect_attrs);
1091 mod->sect_attrs = NULL;
1096 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1099 struct module_notes_attrs {
1100 struct kobject *dir;
1101 unsigned int notes;
1102 struct bin_attribute attrs[0];
1105 static ssize_t module_notes_read(struct kobject *kobj,
1106 struct bin_attribute *bin_attr,
1107 char *buf, loff_t pos, size_t count)
1110 * The caller checked the pos and count against our size.
1112 memcpy(buf, bin_attr->private + pos, count);
1113 return count;
1116 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1117 unsigned int i)
1119 if (notes_attrs->dir) {
1120 while (i-- > 0)
1121 sysfs_remove_bin_file(notes_attrs->dir,
1122 &notes_attrs->attrs[i]);
1123 kobject_put(notes_attrs->dir);
1125 kfree(notes_attrs);
1128 static void add_notes_attrs(struct module *mod, unsigned int nsect,
1129 char *secstrings, Elf_Shdr *sechdrs)
1131 unsigned int notes, loaded, i;
1132 struct module_notes_attrs *notes_attrs;
1133 struct bin_attribute *nattr;
1135 /* failed to create section attributes, so can't create notes */
1136 if (!mod->sect_attrs)
1137 return;
1139 /* Count notes sections and allocate structures. */
1140 notes = 0;
1141 for (i = 0; i < nsect; i++)
1142 if ((sechdrs[i].sh_flags & SHF_ALLOC) &&
1143 (sechdrs[i].sh_type == SHT_NOTE))
1144 ++notes;
1146 if (notes == 0)
1147 return;
1149 notes_attrs = kzalloc(sizeof(*notes_attrs)
1150 + notes * sizeof(notes_attrs->attrs[0]),
1151 GFP_KERNEL);
1152 if (notes_attrs == NULL)
1153 return;
1155 notes_attrs->notes = notes;
1156 nattr = &notes_attrs->attrs[0];
1157 for (loaded = i = 0; i < nsect; ++i) {
1158 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1159 continue;
1160 if (sechdrs[i].sh_type == SHT_NOTE) {
1161 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1162 nattr->attr.mode = S_IRUGO;
1163 nattr->size = sechdrs[i].sh_size;
1164 nattr->private = (void *) sechdrs[i].sh_addr;
1165 nattr->read = module_notes_read;
1166 ++nattr;
1168 ++loaded;
1171 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1172 if (!notes_attrs->dir)
1173 goto out;
1175 for (i = 0; i < notes; ++i)
1176 if (sysfs_create_bin_file(notes_attrs->dir,
1177 &notes_attrs->attrs[i]))
1178 goto out;
1180 mod->notes_attrs = notes_attrs;
1181 return;
1183 out:
1184 free_notes_attrs(notes_attrs, i);
1187 static void remove_notes_attrs(struct module *mod)
1189 if (mod->notes_attrs)
1190 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1193 #else
1195 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
1196 char *sectstrings, Elf_Shdr *sechdrs)
1200 static inline void remove_sect_attrs(struct module *mod)
1204 static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
1205 char *sectstrings, Elf_Shdr *sechdrs)
1209 static inline void remove_notes_attrs(struct module *mod)
1212 #endif
1214 #ifdef CONFIG_SYSFS
1215 int module_add_modinfo_attrs(struct module *mod)
1217 struct module_attribute *attr;
1218 struct module_attribute *temp_attr;
1219 int error = 0;
1220 int i;
1222 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1223 (ARRAY_SIZE(modinfo_attrs) + 1)),
1224 GFP_KERNEL);
1225 if (!mod->modinfo_attrs)
1226 return -ENOMEM;
1228 temp_attr = mod->modinfo_attrs;
1229 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1230 if (!attr->test ||
1231 (attr->test && attr->test(mod))) {
1232 memcpy(temp_attr, attr, sizeof(*temp_attr));
1233 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1234 ++temp_attr;
1237 return error;
1240 void module_remove_modinfo_attrs(struct module *mod)
1242 struct module_attribute *attr;
1243 int i;
1245 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1246 /* pick a field to test for end of list */
1247 if (!attr->attr.name)
1248 break;
1249 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1250 if (attr->free)
1251 attr->free(mod);
1253 kfree(mod->modinfo_attrs);
1256 int mod_sysfs_init(struct module *mod)
1258 int err;
1259 struct kobject *kobj;
1261 if (!module_sysfs_initialized) {
1262 printk(KERN_ERR "%s: module sysfs not initialized\n",
1263 mod->name);
1264 err = -EINVAL;
1265 goto out;
1268 kobj = kset_find_obj(module_kset, mod->name);
1269 if (kobj) {
1270 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1271 kobject_put(kobj);
1272 err = -EINVAL;
1273 goto out;
1276 mod->mkobj.mod = mod;
1278 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1279 mod->mkobj.kobj.kset = module_kset;
1280 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1281 "%s", mod->name);
1282 if (err)
1283 kobject_put(&mod->mkobj.kobj);
1285 /* delay uevent until full sysfs population */
1286 out:
1287 return err;
1290 int mod_sysfs_setup(struct module *mod,
1291 struct kernel_param *kparam,
1292 unsigned int num_params)
1294 int err;
1296 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1297 if (!mod->holders_dir) {
1298 err = -ENOMEM;
1299 goto out_unreg;
1302 err = module_param_sysfs_setup(mod, kparam, num_params);
1303 if (err)
1304 goto out_unreg_holders;
1306 err = module_add_modinfo_attrs(mod);
1307 if (err)
1308 goto out_unreg_param;
1310 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1311 return 0;
1313 out_unreg_param:
1314 module_param_sysfs_remove(mod);
1315 out_unreg_holders:
1316 kobject_put(mod->holders_dir);
1317 out_unreg:
1318 kobject_put(&mod->mkobj.kobj);
1319 return err;
1322 static void mod_sysfs_fini(struct module *mod)
1324 kobject_put(&mod->mkobj.kobj);
1327 #else /* CONFIG_SYSFS */
1329 static void mod_sysfs_fini(struct module *mod)
1333 #endif /* CONFIG_SYSFS */
1335 static void mod_kobject_remove(struct module *mod)
1337 module_remove_modinfo_attrs(mod);
1338 module_param_sysfs_remove(mod);
1339 kobject_put(mod->mkobj.drivers_dir);
1340 kobject_put(mod->holders_dir);
1341 mod_sysfs_fini(mod);
1345 * unlink the module with the whole machine is stopped with interrupts off
1346 * - this defends against kallsyms not taking locks
1348 static int __unlink_module(void *_mod)
1350 struct module *mod = _mod;
1351 list_del(&mod->list);
1352 return 0;
1355 /* Free a module, remove from lists, etc (must hold module_mutex). */
1356 static void free_module(struct module *mod)
1358 trace_module_free(mod);
1360 /* Delete from various lists */
1361 stop_machine(__unlink_module, mod, NULL);
1362 remove_notes_attrs(mod);
1363 remove_sect_attrs(mod);
1364 mod_kobject_remove(mod);
1366 /* Arch-specific cleanup. */
1367 module_arch_cleanup(mod);
1369 /* Module unload stuff */
1370 module_unload_free(mod);
1372 /* Free any allocated parameters. */
1373 destroy_params(mod->kp, mod->num_kp);
1375 /* This may be NULL, but that's OK */
1376 module_free(mod, mod->module_init);
1377 kfree(mod->args);
1378 if (mod->percpu)
1379 percpu_modfree(mod->percpu);
1380 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
1381 if (mod->refptr)
1382 percpu_modfree(mod->refptr);
1383 #endif
1384 /* Free lock-classes: */
1385 lockdep_free_key_range(mod->module_core, mod->core_size);
1387 /* Finally, free the core (containing the module structure) */
1388 module_free(mod, mod->module_core);
1390 #ifdef CONFIG_MPU
1391 update_protections(current->mm);
1392 #endif
1395 void *__symbol_get(const char *symbol)
1397 struct module *owner;
1398 const struct kernel_symbol *sym;
1400 preempt_disable();
1401 sym = find_symbol(symbol, &owner, NULL, true, true);
1402 if (sym && strong_try_module_get(owner))
1403 sym = NULL;
1404 preempt_enable();
1406 return sym ? (void *)sym->value : NULL;
1408 EXPORT_SYMBOL_GPL(__symbol_get);
1411 * Ensure that an exported symbol [global namespace] does not already exist
1412 * in the kernel or in some other module's exported symbol table.
1414 static int verify_export_symbols(struct module *mod)
1416 unsigned int i;
1417 struct module *owner;
1418 const struct kernel_symbol *s;
1419 struct {
1420 const struct kernel_symbol *sym;
1421 unsigned int num;
1422 } arr[] = {
1423 { mod->syms, mod->num_syms },
1424 { mod->gpl_syms, mod->num_gpl_syms },
1425 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1426 #ifdef CONFIG_UNUSED_SYMBOLS
1427 { mod->unused_syms, mod->num_unused_syms },
1428 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1429 #endif
1432 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1433 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1434 if (find_symbol(s->name, &owner, NULL, true, false)) {
1435 printk(KERN_ERR
1436 "%s: exports duplicate symbol %s"
1437 " (owned by %s)\n",
1438 mod->name, s->name, module_name(owner));
1439 return -ENOEXEC;
1443 return 0;
1446 /* Change all symbols so that st_value encodes the pointer directly. */
1447 static int simplify_symbols(Elf_Shdr *sechdrs,
1448 unsigned int symindex,
1449 const char *strtab,
1450 unsigned int versindex,
1451 unsigned int pcpuindex,
1452 struct module *mod)
1454 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
1455 unsigned long secbase;
1456 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1457 int ret = 0;
1458 const struct kernel_symbol *ksym;
1460 for (i = 1; i < n; i++) {
1461 switch (sym[i].st_shndx) {
1462 case SHN_COMMON:
1463 /* We compiled with -fno-common. These are not
1464 supposed to happen. */
1465 DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
1466 printk("%s: please compile with -fno-common\n",
1467 mod->name);
1468 ret = -ENOEXEC;
1469 break;
1471 case SHN_ABS:
1472 /* Don't need to do anything */
1473 DEBUGP("Absolute symbol: 0x%08lx\n",
1474 (long)sym[i].st_value);
1475 break;
1477 case SHN_UNDEF:
1478 ksym = resolve_symbol(sechdrs, versindex,
1479 strtab + sym[i].st_name, mod);
1480 /* Ok if resolved. */
1481 if (ksym) {
1482 sym[i].st_value = ksym->value;
1483 break;
1486 /* Ok if weak. */
1487 if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1488 break;
1490 printk(KERN_WARNING "%s: Unknown symbol %s\n",
1491 mod->name, strtab + sym[i].st_name);
1492 ret = -ENOENT;
1493 break;
1495 default:
1496 /* Divert to percpu allocation if a percpu var. */
1497 if (sym[i].st_shndx == pcpuindex)
1498 secbase = (unsigned long)mod->percpu;
1499 else
1500 secbase = sechdrs[sym[i].st_shndx].sh_addr;
1501 sym[i].st_value += secbase;
1502 break;
1506 return ret;
1509 /* Additional bytes needed by arch in front of individual sections */
1510 unsigned int __weak arch_mod_section_prepend(struct module *mod,
1511 unsigned int section)
1513 /* default implementation just returns zero */
1514 return 0;
1517 /* Update size with this section: return offset. */
1518 static long get_offset(struct module *mod, unsigned int *size,
1519 Elf_Shdr *sechdr, unsigned int section)
1521 long ret;
1523 *size += arch_mod_section_prepend(mod, section);
1524 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
1525 *size = ret + sechdr->sh_size;
1526 return ret;
1529 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1530 might -- code, read-only data, read-write data, small data. Tally
1531 sizes, and place the offsets into sh_entsize fields: high bit means it
1532 belongs in init. */
1533 static void layout_sections(struct module *mod,
1534 const Elf_Ehdr *hdr,
1535 Elf_Shdr *sechdrs,
1536 const char *secstrings)
1538 static unsigned long const masks[][2] = {
1539 /* NOTE: all executable code must be the first section
1540 * in this array; otherwise modify the text_size
1541 * finder in the two loops below */
1542 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1543 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1544 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1545 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1547 unsigned int m, i;
1549 for (i = 0; i < hdr->e_shnum; i++)
1550 sechdrs[i].sh_entsize = ~0UL;
1552 DEBUGP("Core section allocation order:\n");
1553 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1554 for (i = 0; i < hdr->e_shnum; ++i) {
1555 Elf_Shdr *s = &sechdrs[i];
1557 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1558 || (s->sh_flags & masks[m][1])
1559 || s->sh_entsize != ~0UL
1560 || strstarts(secstrings + s->sh_name, ".init"))
1561 continue;
1562 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
1563 DEBUGP("\t%s\n", secstrings + s->sh_name);
1565 if (m == 0)
1566 mod->core_text_size = mod->core_size;
1569 DEBUGP("Init section allocation order:\n");
1570 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1571 for (i = 0; i < hdr->e_shnum; ++i) {
1572 Elf_Shdr *s = &sechdrs[i];
1574 if ((s->sh_flags & masks[m][0]) != masks[m][0]
1575 || (s->sh_flags & masks[m][1])
1576 || s->sh_entsize != ~0UL
1577 || !strstarts(secstrings + s->sh_name, ".init"))
1578 continue;
1579 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
1580 | INIT_OFFSET_MASK);
1581 DEBUGP("\t%s\n", secstrings + s->sh_name);
1583 if (m == 0)
1584 mod->init_text_size = mod->init_size;
1588 static void set_license(struct module *mod, const char *license)
1590 if (!license)
1591 license = "unspecified";
1593 if (!license_is_gpl_compatible(license)) {
1594 if (!test_taint(TAINT_PROPRIETARY_MODULE))
1595 printk(KERN_WARNING "%s: module license '%s' taints "
1596 "kernel.\n", mod->name, license);
1597 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
1601 /* Parse tag=value strings from .modinfo section */
1602 static char *next_string(char *string, unsigned long *secsize)
1604 /* Skip non-zero chars */
1605 while (string[0]) {
1606 string++;
1607 if ((*secsize)-- <= 1)
1608 return NULL;
1611 /* Skip any zero padding. */
1612 while (!string[0]) {
1613 string++;
1614 if ((*secsize)-- <= 1)
1615 return NULL;
1617 return string;
1620 static char *get_modinfo(Elf_Shdr *sechdrs,
1621 unsigned int info,
1622 const char *tag)
1624 char *p;
1625 unsigned int taglen = strlen(tag);
1626 unsigned long size = sechdrs[info].sh_size;
1628 for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
1629 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1630 return p + taglen + 1;
1632 return NULL;
1635 static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
1636 unsigned int infoindex)
1638 struct module_attribute *attr;
1639 int i;
1641 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1642 if (attr->setup)
1643 attr->setup(mod,
1644 get_modinfo(sechdrs,
1645 infoindex,
1646 attr->attr.name));
1650 static void free_modinfo(struct module *mod)
1652 struct module_attribute *attr;
1653 int i;
1655 for (i = 0; (attr = modinfo_attrs[i]); i++) {
1656 if (attr->free)
1657 attr->free(mod);
1661 #ifdef CONFIG_KALLSYMS
1663 /* lookup symbol in given range of kernel_symbols */
1664 static const struct kernel_symbol *lookup_symbol(const char *name,
1665 const struct kernel_symbol *start,
1666 const struct kernel_symbol *stop)
1668 const struct kernel_symbol *ks = start;
1669 for (; ks < stop; ks++)
1670 if (strcmp(ks->name, name) == 0)
1671 return ks;
1672 return NULL;
1675 static int is_exported(const char *name, unsigned long value,
1676 const struct module *mod)
1678 const struct kernel_symbol *ks;
1679 if (!mod)
1680 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
1681 else
1682 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
1683 return ks != NULL && ks->value == value;
1686 /* As per nm */
1687 static char elf_type(const Elf_Sym *sym,
1688 Elf_Shdr *sechdrs,
1689 const char *secstrings,
1690 struct module *mod)
1692 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
1693 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
1694 return 'v';
1695 else
1696 return 'w';
1698 if (sym->st_shndx == SHN_UNDEF)
1699 return 'U';
1700 if (sym->st_shndx == SHN_ABS)
1701 return 'a';
1702 if (sym->st_shndx >= SHN_LORESERVE)
1703 return '?';
1704 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
1705 return 't';
1706 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
1707 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
1708 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
1709 return 'r';
1710 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1711 return 'g';
1712 else
1713 return 'd';
1715 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
1716 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
1717 return 's';
1718 else
1719 return 'b';
1721 if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
1722 return 'n';
1723 return '?';
1726 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
1727 unsigned int shnum)
1729 const Elf_Shdr *sec;
1731 if (src->st_shndx == SHN_UNDEF
1732 || src->st_shndx >= shnum
1733 || !src->st_name)
1734 return false;
1736 sec = sechdrs + src->st_shndx;
1737 if (!(sec->sh_flags & SHF_ALLOC)
1738 #ifndef CONFIG_KALLSYMS_ALL
1739 || !(sec->sh_flags & SHF_EXECINSTR)
1740 #endif
1741 || (sec->sh_entsize & INIT_OFFSET_MASK))
1742 return false;
1744 return true;
1747 static unsigned long layout_symtab(struct module *mod,
1748 Elf_Shdr *sechdrs,
1749 unsigned int symindex,
1750 unsigned int strindex,
1751 const Elf_Ehdr *hdr,
1752 const char *secstrings,
1753 unsigned long *pstroffs,
1754 unsigned long *strmap)
1756 unsigned long symoffs;
1757 Elf_Shdr *symsect = sechdrs + symindex;
1758 Elf_Shdr *strsect = sechdrs + strindex;
1759 const Elf_Sym *src;
1760 const char *strtab;
1761 unsigned int i, nsrc, ndst;
1763 /* Put symbol section at end of init part of module. */
1764 symsect->sh_flags |= SHF_ALLOC;
1765 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
1766 symindex) | INIT_OFFSET_MASK;
1767 DEBUGP("\t%s\n", secstrings + symsect->sh_name);
1769 src = (void *)hdr + symsect->sh_offset;
1770 nsrc = symsect->sh_size / sizeof(*src);
1771 strtab = (void *)hdr + strsect->sh_offset;
1772 for (ndst = i = 1; i < nsrc; ++i, ++src)
1773 if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
1774 unsigned int j = src->st_name;
1776 while(!__test_and_set_bit(j, strmap) && strtab[j])
1777 ++j;
1778 ++ndst;
1781 /* Append room for core symbols at end of core part. */
1782 symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
1783 mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
1785 /* Put string table section at end of init part of module. */
1786 strsect->sh_flags |= SHF_ALLOC;
1787 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
1788 strindex) | INIT_OFFSET_MASK;
1789 DEBUGP("\t%s\n", secstrings + strsect->sh_name);
1791 /* Append room for core symbols' strings at end of core part. */
1792 *pstroffs = mod->core_size;
1793 __set_bit(0, strmap);
1794 mod->core_size += bitmap_weight(strmap, strsect->sh_size);
1796 return symoffs;
1799 static void add_kallsyms(struct module *mod,
1800 Elf_Shdr *sechdrs,
1801 unsigned int shnum,
1802 unsigned int symindex,
1803 unsigned int strindex,
1804 unsigned long symoffs,
1805 unsigned long stroffs,
1806 const char *secstrings,
1807 unsigned long *strmap)
1809 unsigned int i, ndst;
1810 const Elf_Sym *src;
1811 Elf_Sym *dst;
1812 char *s;
1814 mod->symtab = (void *)sechdrs[symindex].sh_addr;
1815 mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
1816 mod->strtab = (void *)sechdrs[strindex].sh_addr;
1818 /* Set types up while we still have access to sections. */
1819 for (i = 0; i < mod->num_symtab; i++)
1820 mod->symtab[i].st_info
1821 = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
1823 mod->core_symtab = dst = mod->module_core + symoffs;
1824 src = mod->symtab;
1825 *dst = *src;
1826 for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
1827 if (!is_core_symbol(src, sechdrs, shnum))
1828 continue;
1829 dst[ndst] = *src;
1830 dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
1831 ++ndst;
1833 mod->core_num_syms = ndst;
1835 mod->core_strtab = s = mod->module_core + stroffs;
1836 for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
1837 if (test_bit(i, strmap))
1838 *++s = mod->strtab[i];
1840 #else
1841 static inline unsigned long layout_symtab(struct module *mod,
1842 Elf_Shdr *sechdrs,
1843 unsigned int symindex,
1844 unsigned int strindex,
1845 const Elf_Ehdr *hdr,
1846 const char *secstrings,
1847 unsigned long *pstroffs,
1848 unsigned long *strmap)
1850 return 0;
1853 static inline void add_kallsyms(struct module *mod,
1854 Elf_Shdr *sechdrs,
1855 unsigned int shnum,
1856 unsigned int symindex,
1857 unsigned int strindex,
1858 unsigned long symoffs,
1859 unsigned long stroffs,
1860 const char *secstrings,
1861 const unsigned long *strmap)
1864 #endif /* CONFIG_KALLSYMS */
1866 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
1868 #ifdef CONFIG_DYNAMIC_DEBUG
1869 if (ddebug_add_module(debug, num, debug->modname))
1870 printk(KERN_ERR "dynamic debug error adding module: %s\n",
1871 debug->modname);
1872 #endif
1875 static void *module_alloc_update_bounds(unsigned long size)
1877 void *ret = module_alloc(size);
1879 if (ret) {
1880 /* Update module bounds. */
1881 if ((unsigned long)ret < module_addr_min)
1882 module_addr_min = (unsigned long)ret;
1883 if ((unsigned long)ret + size > module_addr_max)
1884 module_addr_max = (unsigned long)ret + size;
1886 return ret;
1889 #ifdef CONFIG_DEBUG_KMEMLEAK
1890 static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1891 Elf_Shdr *sechdrs, char *secstrings)
1893 unsigned int i;
1895 /* only scan the sections containing data */
1896 kmemleak_scan_area(mod->module_core, (unsigned long)mod -
1897 (unsigned long)mod->module_core,
1898 sizeof(struct module), GFP_KERNEL);
1900 for (i = 1; i < hdr->e_shnum; i++) {
1901 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
1902 continue;
1903 if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
1904 && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
1905 continue;
1907 kmemleak_scan_area(mod->module_core, sechdrs[i].sh_addr -
1908 (unsigned long)mod->module_core,
1909 sechdrs[i].sh_size, GFP_KERNEL);
1912 #else
1913 static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
1914 Elf_Shdr *sechdrs, char *secstrings)
1917 #endif
1919 /* Allocate and load the module: note that size of section 0 is always
1920 zero, and we rely on this for optional sections. */
1921 static noinline struct module *load_module(void __user *umod,
1922 unsigned long len,
1923 const char __user *uargs)
1925 Elf_Ehdr *hdr;
1926 Elf_Shdr *sechdrs;
1927 char *secstrings, *args, *modmagic, *strtab = NULL;
1928 char *staging;
1929 unsigned int i;
1930 unsigned int symindex = 0;
1931 unsigned int strindex = 0;
1932 unsigned int modindex, versindex, infoindex, pcpuindex;
1933 struct module *mod;
1934 long err = 0;
1935 void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
1936 unsigned long symoffs, stroffs, *strmap;
1938 mm_segment_t old_fs;
1940 DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
1941 umod, len, uargs);
1942 if (len < sizeof(*hdr))
1943 return ERR_PTR(-ENOEXEC);
1945 /* Suck in entire file: we'll want most of it. */
1946 /* vmalloc barfs on "unusual" numbers. Check here */
1947 if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
1948 return ERR_PTR(-ENOMEM);
1950 if (copy_from_user(hdr, umod, len) != 0) {
1951 err = -EFAULT;
1952 goto free_hdr;
1955 /* Sanity checks against insmoding binaries or wrong arch,
1956 weird elf version */
1957 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
1958 || hdr->e_type != ET_REL
1959 || !elf_check_arch(hdr)
1960 || hdr->e_shentsize != sizeof(*sechdrs)) {
1961 err = -ENOEXEC;
1962 goto free_hdr;
1965 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
1966 goto truncated;
1968 /* Convenience variables */
1969 sechdrs = (void *)hdr + hdr->e_shoff;
1970 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
1971 sechdrs[0].sh_addr = 0;
1973 for (i = 1; i < hdr->e_shnum; i++) {
1974 if (sechdrs[i].sh_type != SHT_NOBITS
1975 && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
1976 goto truncated;
1978 /* Mark all sections sh_addr with their address in the
1979 temporary image. */
1980 sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
1982 /* Internal symbols and strings. */
1983 if (sechdrs[i].sh_type == SHT_SYMTAB) {
1984 symindex = i;
1985 strindex = sechdrs[i].sh_link;
1986 strtab = (char *)hdr + sechdrs[strindex].sh_offset;
1988 #ifndef CONFIG_MODULE_UNLOAD
1989 /* Don't load .exit sections */
1990 if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
1991 sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
1992 #endif
1995 modindex = find_sec(hdr, sechdrs, secstrings,
1996 ".gnu.linkonce.this_module");
1997 if (!modindex) {
1998 printk(KERN_WARNING "No module found in object\n");
1999 err = -ENOEXEC;
2000 goto free_hdr;
2002 /* This is temporary: point mod into copy of data. */
2003 mod = (void *)sechdrs[modindex].sh_addr;
2005 if (symindex == 0) {
2006 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2007 mod->name);
2008 err = -ENOEXEC;
2009 goto free_hdr;
2012 versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
2013 infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
2014 pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
2016 /* Don't keep modinfo and version sections. */
2017 sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2018 sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2020 /* Check module struct version now, before we try to use module. */
2021 if (!check_modstruct_version(sechdrs, versindex, mod)) {
2022 err = -ENOEXEC;
2023 goto free_hdr;
2026 modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
2027 /* This is allowed: modprobe --force will invalidate it. */
2028 if (!modmagic) {
2029 err = try_to_force_load(mod, "bad vermagic");
2030 if (err)
2031 goto free_hdr;
2032 } else if (!same_magic(modmagic, vermagic, versindex)) {
2033 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2034 mod->name, modmagic, vermagic);
2035 err = -ENOEXEC;
2036 goto free_hdr;
2039 staging = get_modinfo(sechdrs, infoindex, "staging");
2040 if (staging) {
2041 add_taint_module(mod, TAINT_CRAP);
2042 printk(KERN_WARNING "%s: module is from the staging directory,"
2043 " the quality is unknown, you have been warned.\n",
2044 mod->name);
2047 /* Now copy in args */
2048 args = strndup_user(uargs, ~0UL >> 1);
2049 if (IS_ERR(args)) {
2050 err = PTR_ERR(args);
2051 goto free_hdr;
2054 strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
2055 * sizeof(long), GFP_KERNEL);
2056 if (!strmap) {
2057 err = -ENOMEM;
2058 goto free_mod;
2061 if (find_module(mod->name)) {
2062 err = -EEXIST;
2063 goto free_mod;
2066 mod->state = MODULE_STATE_COMING;
2068 /* Allow arches to frob section contents and sizes. */
2069 err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
2070 if (err < 0)
2071 goto free_mod;
2073 if (pcpuindex) {
2074 /* We have a special allocation for this section. */
2075 percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
2076 sechdrs[pcpuindex].sh_addralign,
2077 mod->name);
2078 if (!percpu) {
2079 err = -ENOMEM;
2080 goto free_mod;
2082 sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
2083 mod->percpu = percpu;
2086 /* Determine total sizes, and put offsets in sh_entsize. For now
2087 this is done generically; there doesn't appear to be any
2088 special cases for the architectures. */
2089 layout_sections(mod, hdr, sechdrs, secstrings);
2090 symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
2091 secstrings, &stroffs, strmap);
2093 /* Do the allocs. */
2094 ptr = module_alloc_update_bounds(mod->core_size);
2096 * The pointer to this block is stored in the module structure
2097 * which is inside the block. Just mark it as not being a
2098 * leak.
2100 kmemleak_not_leak(ptr);
2101 if (!ptr) {
2102 err = -ENOMEM;
2103 goto free_percpu;
2105 memset(ptr, 0, mod->core_size);
2106 mod->module_core = ptr;
2108 ptr = module_alloc_update_bounds(mod->init_size);
2110 * The pointer to this block is stored in the module structure
2111 * which is inside the block. This block doesn't need to be
2112 * scanned as it contains data and code that will be freed
2113 * after the module is initialized.
2115 kmemleak_ignore(ptr);
2116 if (!ptr && mod->init_size) {
2117 err = -ENOMEM;
2118 goto free_core;
2120 memset(ptr, 0, mod->init_size);
2121 mod->module_init = ptr;
2123 /* Transfer each section which specifies SHF_ALLOC */
2124 DEBUGP("final section addresses:\n");
2125 for (i = 0; i < hdr->e_shnum; i++) {
2126 void *dest;
2128 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
2129 continue;
2131 if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
2132 dest = mod->module_init
2133 + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
2134 else
2135 dest = mod->module_core + sechdrs[i].sh_entsize;
2137 if (sechdrs[i].sh_type != SHT_NOBITS)
2138 memcpy(dest, (void *)sechdrs[i].sh_addr,
2139 sechdrs[i].sh_size);
2140 /* Update sh_addr to point to copy in image. */
2141 sechdrs[i].sh_addr = (unsigned long)dest;
2142 DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
2144 /* Module has been moved. */
2145 mod = (void *)sechdrs[modindex].sh_addr;
2146 kmemleak_load_module(mod, hdr, sechdrs, secstrings);
2148 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2149 mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t),
2150 mod->name);
2151 if (!mod->refptr) {
2152 err = -ENOMEM;
2153 goto free_init;
2155 #endif
2156 /* Now we've moved module, initialize linked lists, etc. */
2157 module_unload_init(mod);
2159 /* add kobject, so we can reference it. */
2160 err = mod_sysfs_init(mod);
2161 if (err)
2162 goto free_unload;
2164 /* Set up license info based on the info section */
2165 set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
2168 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2169 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2170 * using GPL-only symbols it needs.
2172 if (strcmp(mod->name, "ndiswrapper") == 0)
2173 add_taint(TAINT_PROPRIETARY_MODULE);
2175 /* driverloader was caught wrongly pretending to be under GPL */
2176 if (strcmp(mod->name, "driverloader") == 0)
2177 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2179 /* Set up MODINFO_ATTR fields */
2180 setup_modinfo(mod, sechdrs, infoindex);
2182 /* Fix up syms, so that st_value is a pointer to location. */
2183 err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
2184 mod);
2185 if (err < 0)
2186 goto cleanup;
2188 /* Now we've got everything in the final locations, we can
2189 * find optional sections. */
2190 mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
2191 sizeof(*mod->kp), &mod->num_kp);
2192 mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
2193 sizeof(*mod->syms), &mod->num_syms);
2194 mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
2195 mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
2196 sizeof(*mod->gpl_syms),
2197 &mod->num_gpl_syms);
2198 mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
2199 mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
2200 "__ksymtab_gpl_future",
2201 sizeof(*mod->gpl_future_syms),
2202 &mod->num_gpl_future_syms);
2203 mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
2204 "__kcrctab_gpl_future");
2206 #ifdef CONFIG_UNUSED_SYMBOLS
2207 mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
2208 "__ksymtab_unused",
2209 sizeof(*mod->unused_syms),
2210 &mod->num_unused_syms);
2211 mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
2212 "__kcrctab_unused");
2213 mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
2214 "__ksymtab_unused_gpl",
2215 sizeof(*mod->unused_gpl_syms),
2216 &mod->num_unused_gpl_syms);
2217 mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
2218 "__kcrctab_unused_gpl");
2219 #endif
2220 #ifdef CONFIG_CONSTRUCTORS
2221 mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
2222 sizeof(*mod->ctors), &mod->num_ctors);
2223 #endif
2225 #ifdef CONFIG_TRACEPOINTS
2226 mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
2227 "__tracepoints",
2228 sizeof(*mod->tracepoints),
2229 &mod->num_tracepoints);
2230 #endif
2231 #ifdef CONFIG_EVENT_TRACING
2232 mod->trace_events = section_objs(hdr, sechdrs, secstrings,
2233 "_ftrace_events",
2234 sizeof(*mod->trace_events),
2235 &mod->num_trace_events);
2236 #endif
2237 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2238 /* sechdrs[0].sh_size is always zero */
2239 mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
2240 "__mcount_loc",
2241 sizeof(*mod->ftrace_callsites),
2242 &mod->num_ftrace_callsites);
2243 #endif
2244 #ifdef CONFIG_MODVERSIONS
2245 if ((mod->num_syms && !mod->crcs)
2246 || (mod->num_gpl_syms && !mod->gpl_crcs)
2247 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2248 #ifdef CONFIG_UNUSED_SYMBOLS
2249 || (mod->num_unused_syms && !mod->unused_crcs)
2250 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2251 #endif
2253 err = try_to_force_load(mod,
2254 "no versions for exported symbols");
2255 if (err)
2256 goto cleanup;
2258 #endif
2260 /* Now do relocations. */
2261 for (i = 1; i < hdr->e_shnum; i++) {
2262 const char *strtab = (char *)sechdrs[strindex].sh_addr;
2263 unsigned int info = sechdrs[i].sh_info;
2265 /* Not a valid relocation section? */
2266 if (info >= hdr->e_shnum)
2267 continue;
2269 /* Don't bother with non-allocated sections */
2270 if (!(sechdrs[info].sh_flags & SHF_ALLOC))
2271 continue;
2273 if (sechdrs[i].sh_type == SHT_REL)
2274 err = apply_relocate(sechdrs, strtab, symindex, i,mod);
2275 else if (sechdrs[i].sh_type == SHT_RELA)
2276 err = apply_relocate_add(sechdrs, strtab, symindex, i,
2277 mod);
2278 if (err < 0)
2279 goto cleanup;
2282 /* Find duplicate symbols */
2283 err = verify_export_symbols(mod);
2284 if (err < 0)
2285 goto cleanup;
2287 /* Set up and sort exception table */
2288 mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
2289 sizeof(*mod->extable), &mod->num_exentries);
2290 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2292 /* Finally, copy percpu area over. */
2293 percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
2294 sechdrs[pcpuindex].sh_size);
2296 add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
2297 symoffs, stroffs, secstrings, strmap);
2298 kfree(strmap);
2299 strmap = NULL;
2301 if (!mod->taints) {
2302 struct _ddebug *debug;
2303 unsigned int num_debug;
2305 debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
2306 sizeof(*debug), &num_debug);
2307 if (debug)
2308 dynamic_debug_setup(debug, num_debug);
2311 err = module_finalize(hdr, sechdrs, mod);
2312 if (err < 0)
2313 goto cleanup;
2315 /* flush the icache in correct context */
2316 old_fs = get_fs();
2317 set_fs(KERNEL_DS);
2320 * Flush the instruction cache, since we've played with text.
2321 * Do it before processing of module parameters, so the module
2322 * can provide parameter accessor functions of its own.
2324 if (mod->module_init)
2325 flush_icache_range((unsigned long)mod->module_init,
2326 (unsigned long)mod->module_init
2327 + mod->init_size);
2328 flush_icache_range((unsigned long)mod->module_core,
2329 (unsigned long)mod->module_core + mod->core_size);
2331 set_fs(old_fs);
2333 mod->args = args;
2334 if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
2335 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2336 mod->name);
2338 /* Now sew it into the lists so we can get lockdep and oops
2339 * info during argument parsing. Noone should access us, since
2340 * strong_try_module_get() will fail.
2341 * lockdep/oops can run asynchronous, so use the RCU list insertion
2342 * function to insert in a way safe to concurrent readers.
2343 * The mutex protects against concurrent writers.
2345 list_add_rcu(&mod->list, &modules);
2347 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
2348 if (err < 0)
2349 goto unlink;
2351 err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
2352 if (err < 0)
2353 goto unlink;
2354 add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2355 add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
2357 /* Get rid of temporary copy */
2358 vfree(hdr);
2360 trace_module_load(mod);
2362 /* Done! */
2363 return mod;
2365 unlink:
2366 /* Unlink carefully: kallsyms could be walking list. */
2367 list_del_rcu(&mod->list);
2368 synchronize_sched();
2369 module_arch_cleanup(mod);
2370 cleanup:
2371 free_modinfo(mod);
2372 kobject_del(&mod->mkobj.kobj);
2373 kobject_put(&mod->mkobj.kobj);
2374 free_unload:
2375 module_unload_free(mod);
2376 #if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP)
2377 percpu_modfree(mod->refptr);
2378 free_init:
2379 #endif
2380 module_free(mod, mod->module_init);
2381 free_core:
2382 module_free(mod, mod->module_core);
2383 /* mod will be freed with core. Don't access it beyond this line! */
2384 free_percpu:
2385 if (percpu)
2386 percpu_modfree(percpu);
2387 free_mod:
2388 kfree(args);
2389 kfree(strmap);
2390 free_hdr:
2391 vfree(hdr);
2392 return ERR_PTR(err);
2394 truncated:
2395 printk(KERN_ERR "Module len %lu truncated\n", len);
2396 err = -ENOEXEC;
2397 goto free_hdr;
2400 /* Call module constructors. */
2401 static void do_mod_ctors(struct module *mod)
2403 #ifdef CONFIG_CONSTRUCTORS
2404 unsigned long i;
2406 for (i = 0; i < mod->num_ctors; i++)
2407 mod->ctors[i]();
2408 #endif
2411 /* This is where the real work happens */
2412 SYSCALL_DEFINE3(init_module, void __user *, umod,
2413 unsigned long, len, const char __user *, uargs)
2415 struct module *mod;
2416 int ret = 0;
2418 /* Must have permission */
2419 if (!capable(CAP_SYS_MODULE) || modules_disabled)
2420 return -EPERM;
2422 /* Only one module load at a time, please */
2423 if (mutex_lock_interruptible(&module_mutex) != 0)
2424 return -EINTR;
2426 /* Do all the hard work */
2427 mod = load_module(umod, len, uargs);
2428 if (IS_ERR(mod)) {
2429 mutex_unlock(&module_mutex);
2430 return PTR_ERR(mod);
2433 /* Drop lock so they can recurse */
2434 mutex_unlock(&module_mutex);
2436 blocking_notifier_call_chain(&module_notify_list,
2437 MODULE_STATE_COMING, mod);
2439 do_mod_ctors(mod);
2440 /* Start the module */
2441 if (mod->init != NULL)
2442 ret = do_one_initcall(mod->init);
2443 if (ret < 0) {
2444 /* Init routine failed: abort. Try to protect us from
2445 buggy refcounters. */
2446 mod->state = MODULE_STATE_GOING;
2447 synchronize_sched();
2448 module_put(mod);
2449 blocking_notifier_call_chain(&module_notify_list,
2450 MODULE_STATE_GOING, mod);
2451 mutex_lock(&module_mutex);
2452 free_module(mod);
2453 mutex_unlock(&module_mutex);
2454 wake_up(&module_wq);
2455 return ret;
2457 if (ret > 0) {
2458 printk(KERN_WARNING
2459 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
2460 "%s: loading module anyway...\n",
2461 __func__, mod->name, ret,
2462 __func__);
2463 dump_stack();
2466 /* Now it's a first class citizen! Wake up anyone waiting for it. */
2467 mod->state = MODULE_STATE_LIVE;
2468 wake_up(&module_wq);
2469 blocking_notifier_call_chain(&module_notify_list,
2470 MODULE_STATE_LIVE, mod);
2472 /* We need to finish all async code before the module init sequence is done */
2473 async_synchronize_full();
2475 mutex_lock(&module_mutex);
2476 /* Drop initial reference. */
2477 module_put(mod);
2478 trim_init_extable(mod);
2479 #ifdef CONFIG_KALLSYMS
2480 mod->num_symtab = mod->core_num_syms;
2481 mod->symtab = mod->core_symtab;
2482 mod->strtab = mod->core_strtab;
2483 #endif
2484 module_free(mod, mod->module_init);
2485 mod->module_init = NULL;
2486 mod->init_size = 0;
2487 mod->init_text_size = 0;
2488 mutex_unlock(&module_mutex);
2490 return 0;
2493 static inline int within(unsigned long addr, void *start, unsigned long size)
2495 return ((void *)addr >= start && (void *)addr < start + size);
2498 #ifdef CONFIG_KALLSYMS
2500 * This ignores the intensely annoying "mapping symbols" found
2501 * in ARM ELF files: $a, $t and $d.
2503 static inline int is_arm_mapping_symbol(const char *str)
2505 return str[0] == '$' && strchr("atd", str[1])
2506 && (str[2] == '\0' || str[2] == '.');
2509 static const char *get_ksymbol(struct module *mod,
2510 unsigned long addr,
2511 unsigned long *size,
2512 unsigned long *offset)
2514 unsigned int i, best = 0;
2515 unsigned long nextval;
2517 /* At worse, next value is at end of module */
2518 if (within_module_init(addr, mod))
2519 nextval = (unsigned long)mod->module_init+mod->init_text_size;
2520 else
2521 nextval = (unsigned long)mod->module_core+mod->core_text_size;
2523 /* Scan for closest preceeding symbol, and next symbol. (ELF
2524 starts real symbols at 1). */
2525 for (i = 1; i < mod->num_symtab; i++) {
2526 if (mod->symtab[i].st_shndx == SHN_UNDEF)
2527 continue;
2529 /* We ignore unnamed symbols: they're uninformative
2530 * and inserted at a whim. */
2531 if (mod->symtab[i].st_value <= addr
2532 && mod->symtab[i].st_value > mod->symtab[best].st_value
2533 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2534 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2535 best = i;
2536 if (mod->symtab[i].st_value > addr
2537 && mod->symtab[i].st_value < nextval
2538 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
2539 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
2540 nextval = mod->symtab[i].st_value;
2543 if (!best)
2544 return NULL;
2546 if (size)
2547 *size = nextval - mod->symtab[best].st_value;
2548 if (offset)
2549 *offset = addr - mod->symtab[best].st_value;
2550 return mod->strtab + mod->symtab[best].st_name;
2553 /* For kallsyms to ask for address resolution. NULL means not found. Careful
2554 * not to lock to avoid deadlock on oopses, simply disable preemption. */
2555 const char *module_address_lookup(unsigned long addr,
2556 unsigned long *size,
2557 unsigned long *offset,
2558 char **modname,
2559 char *namebuf)
2561 struct module *mod;
2562 const char *ret = NULL;
2564 preempt_disable();
2565 list_for_each_entry_rcu(mod, &modules, list) {
2566 if (within_module_init(addr, mod) ||
2567 within_module_core(addr, mod)) {
2568 if (modname)
2569 *modname = mod->name;
2570 ret = get_ksymbol(mod, addr, size, offset);
2571 break;
2574 /* Make a copy in here where it's safe */
2575 if (ret) {
2576 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
2577 ret = namebuf;
2579 preempt_enable();
2580 return ret;
2583 int lookup_module_symbol_name(unsigned long addr, char *symname)
2585 struct module *mod;
2587 preempt_disable();
2588 list_for_each_entry_rcu(mod, &modules, list) {
2589 if (within_module_init(addr, mod) ||
2590 within_module_core(addr, mod)) {
2591 const char *sym;
2593 sym = get_ksymbol(mod, addr, NULL, NULL);
2594 if (!sym)
2595 goto out;
2596 strlcpy(symname, sym, KSYM_NAME_LEN);
2597 preempt_enable();
2598 return 0;
2601 out:
2602 preempt_enable();
2603 return -ERANGE;
2606 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
2607 unsigned long *offset, char *modname, char *name)
2609 struct module *mod;
2611 preempt_disable();
2612 list_for_each_entry_rcu(mod, &modules, list) {
2613 if (within_module_init(addr, mod) ||
2614 within_module_core(addr, mod)) {
2615 const char *sym;
2617 sym = get_ksymbol(mod, addr, size, offset);
2618 if (!sym)
2619 goto out;
2620 if (modname)
2621 strlcpy(modname, mod->name, MODULE_NAME_LEN);
2622 if (name)
2623 strlcpy(name, sym, KSYM_NAME_LEN);
2624 preempt_enable();
2625 return 0;
2628 out:
2629 preempt_enable();
2630 return -ERANGE;
2633 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
2634 char *name, char *module_name, int *exported)
2636 struct module *mod;
2638 preempt_disable();
2639 list_for_each_entry_rcu(mod, &modules, list) {
2640 if (symnum < mod->num_symtab) {
2641 *value = mod->symtab[symnum].st_value;
2642 *type = mod->symtab[symnum].st_info;
2643 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
2644 KSYM_NAME_LEN);
2645 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
2646 *exported = is_exported(name, *value, mod);
2647 preempt_enable();
2648 return 0;
2650 symnum -= mod->num_symtab;
2652 preempt_enable();
2653 return -ERANGE;
2656 static unsigned long mod_find_symname(struct module *mod, const char *name)
2658 unsigned int i;
2660 for (i = 0; i < mod->num_symtab; i++)
2661 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
2662 mod->symtab[i].st_info != 'U')
2663 return mod->symtab[i].st_value;
2664 return 0;
2667 /* Look for this name: can be of form module:name. */
2668 unsigned long module_kallsyms_lookup_name(const char *name)
2670 struct module *mod;
2671 char *colon;
2672 unsigned long ret = 0;
2674 /* Don't lock: we're in enough trouble already. */
2675 preempt_disable();
2676 if ((colon = strchr(name, ':')) != NULL) {
2677 *colon = '\0';
2678 if ((mod = find_module(name)) != NULL)
2679 ret = mod_find_symname(mod, colon+1);
2680 *colon = ':';
2681 } else {
2682 list_for_each_entry_rcu(mod, &modules, list)
2683 if ((ret = mod_find_symname(mod, name)) != 0)
2684 break;
2686 preempt_enable();
2687 return ret;
2690 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
2691 struct module *, unsigned long),
2692 void *data)
2694 struct module *mod;
2695 unsigned int i;
2696 int ret;
2698 list_for_each_entry(mod, &modules, list) {
2699 for (i = 0; i < mod->num_symtab; i++) {
2700 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
2701 mod, mod->symtab[i].st_value);
2702 if (ret != 0)
2703 return ret;
2706 return 0;
2708 #endif /* CONFIG_KALLSYMS */
2710 static char *module_flags(struct module *mod, char *buf)
2712 int bx = 0;
2714 if (mod->taints ||
2715 mod->state == MODULE_STATE_GOING ||
2716 mod->state == MODULE_STATE_COMING) {
2717 buf[bx++] = '(';
2718 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
2719 buf[bx++] = 'P';
2720 if (mod->taints & (1 << TAINT_FORCED_MODULE))
2721 buf[bx++] = 'F';
2722 if (mod->taints & (1 << TAINT_CRAP))
2723 buf[bx++] = 'C';
2725 * TAINT_FORCED_RMMOD: could be added.
2726 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
2727 * apply to modules.
2730 /* Show a - for module-is-being-unloaded */
2731 if (mod->state == MODULE_STATE_GOING)
2732 buf[bx++] = '-';
2733 /* Show a + for module-is-being-loaded */
2734 if (mod->state == MODULE_STATE_COMING)
2735 buf[bx++] = '+';
2736 buf[bx++] = ')';
2738 buf[bx] = '\0';
2740 return buf;
2743 #ifdef CONFIG_PROC_FS
2744 /* Called by the /proc file system to return a list of modules. */
2745 static void *m_start(struct seq_file *m, loff_t *pos)
2747 mutex_lock(&module_mutex);
2748 return seq_list_start(&modules, *pos);
2751 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
2753 return seq_list_next(p, &modules, pos);
2756 static void m_stop(struct seq_file *m, void *p)
2758 mutex_unlock(&module_mutex);
2761 static int m_show(struct seq_file *m, void *p)
2763 struct module *mod = list_entry(p, struct module, list);
2764 char buf[8];
2766 seq_printf(m, "%s %u",
2767 mod->name, mod->init_size + mod->core_size);
2768 print_unload_info(m, mod);
2770 /* Informative for users. */
2771 seq_printf(m, " %s",
2772 mod->state == MODULE_STATE_GOING ? "Unloading":
2773 mod->state == MODULE_STATE_COMING ? "Loading":
2774 "Live");
2775 /* Used by oprofile and other similar tools. */
2776 seq_printf(m, " 0x%p", mod->module_core);
2778 /* Taints info */
2779 if (mod->taints)
2780 seq_printf(m, " %s", module_flags(mod, buf));
2782 seq_printf(m, "\n");
2783 return 0;
2786 /* Format: modulename size refcount deps address
2788 Where refcount is a number or -, and deps is a comma-separated list
2789 of depends or -.
2791 static const struct seq_operations modules_op = {
2792 .start = m_start,
2793 .next = m_next,
2794 .stop = m_stop,
2795 .show = m_show
2798 static int modules_open(struct inode *inode, struct file *file)
2800 return seq_open(file, &modules_op);
2803 static const struct file_operations proc_modules_operations = {
2804 .open = modules_open,
2805 .read = seq_read,
2806 .llseek = seq_lseek,
2807 .release = seq_release,
2810 static int __init proc_modules_init(void)
2812 proc_create("modules", 0, NULL, &proc_modules_operations);
2813 return 0;
2815 module_init(proc_modules_init);
2816 #endif
2818 /* Given an address, look for it in the module exception tables. */
2819 const struct exception_table_entry *search_module_extables(unsigned long addr)
2821 const struct exception_table_entry *e = NULL;
2822 struct module *mod;
2824 preempt_disable();
2825 list_for_each_entry_rcu(mod, &modules, list) {
2826 if (mod->num_exentries == 0)
2827 continue;
2829 e = search_extable(mod->extable,
2830 mod->extable + mod->num_exentries - 1,
2831 addr);
2832 if (e)
2833 break;
2835 preempt_enable();
2837 /* Now, if we found one, we are running inside it now, hence
2838 we cannot unload the module, hence no refcnt needed. */
2839 return e;
2843 * is_module_address - is this address inside a module?
2844 * @addr: the address to check.
2846 * See is_module_text_address() if you simply want to see if the address
2847 * is code (not data).
2849 bool is_module_address(unsigned long addr)
2851 bool ret;
2853 preempt_disable();
2854 ret = __module_address(addr) != NULL;
2855 preempt_enable();
2857 return ret;
2861 * __module_address - get the module which contains an address.
2862 * @addr: the address.
2864 * Must be called with preempt disabled or module mutex held so that
2865 * module doesn't get freed during this.
2867 struct module *__module_address(unsigned long addr)
2869 struct module *mod;
2871 if (addr < module_addr_min || addr > module_addr_max)
2872 return NULL;
2874 list_for_each_entry_rcu(mod, &modules, list)
2875 if (within_module_core(addr, mod)
2876 || within_module_init(addr, mod))
2877 return mod;
2878 return NULL;
2880 EXPORT_SYMBOL_GPL(__module_address);
2883 * is_module_text_address - is this address inside module code?
2884 * @addr: the address to check.
2886 * See is_module_address() if you simply want to see if the address is
2887 * anywhere in a module. See kernel_text_address() for testing if an
2888 * address corresponds to kernel or module code.
2890 bool is_module_text_address(unsigned long addr)
2892 bool ret;
2894 preempt_disable();
2895 ret = __module_text_address(addr) != NULL;
2896 preempt_enable();
2898 return ret;
2902 * __module_text_address - get the module whose code contains an address.
2903 * @addr: the address.
2905 * Must be called with preempt disabled or module mutex held so that
2906 * module doesn't get freed during this.
2908 struct module *__module_text_address(unsigned long addr)
2910 struct module *mod = __module_address(addr);
2911 if (mod) {
2912 /* Make sure it's within the text section. */
2913 if (!within(addr, mod->module_init, mod->init_text_size)
2914 && !within(addr, mod->module_core, mod->core_text_size))
2915 mod = NULL;
2917 return mod;
2919 EXPORT_SYMBOL_GPL(__module_text_address);
2921 /* Don't grab lock, we're oopsing. */
2922 void print_modules(void)
2924 struct module *mod;
2925 char buf[8];
2927 printk(KERN_DEFAULT "Modules linked in:");
2928 /* Most callers should already have preempt disabled, but make sure */
2929 preempt_disable();
2930 list_for_each_entry_rcu(mod, &modules, list)
2931 printk(" %s%s", mod->name, module_flags(mod, buf));
2932 preempt_enable();
2933 if (last_unloaded_module[0])
2934 printk(" [last unloaded: %s]", last_unloaded_module);
2935 printk("\n");
2938 #ifdef CONFIG_MODVERSIONS
2939 /* Generate the signature for all relevant module structures here.
2940 * If these change, we don't want to try to parse the module. */
2941 void module_layout(struct module *mod,
2942 struct modversion_info *ver,
2943 struct kernel_param *kp,
2944 struct kernel_symbol *ks,
2945 struct tracepoint *tp)
2948 EXPORT_SYMBOL(module_layout);
2949 #endif
2951 #ifdef CONFIG_TRACEPOINTS
2952 void module_update_tracepoints(void)
2954 struct module *mod;
2956 mutex_lock(&module_mutex);
2957 list_for_each_entry(mod, &modules, list)
2958 if (!mod->taints)
2959 tracepoint_update_probe_range(mod->tracepoints,
2960 mod->tracepoints + mod->num_tracepoints);
2961 mutex_unlock(&module_mutex);
2965 * Returns 0 if current not found.
2966 * Returns 1 if current found.
2968 int module_get_iter_tracepoints(struct tracepoint_iter *iter)
2970 struct module *iter_mod;
2971 int found = 0;
2973 mutex_lock(&module_mutex);
2974 list_for_each_entry(iter_mod, &modules, list) {
2975 if (!iter_mod->taints) {
2977 * Sorted module list
2979 if (iter_mod < iter->module)
2980 continue;
2981 else if (iter_mod > iter->module)
2982 iter->tracepoint = NULL;
2983 found = tracepoint_get_iter_range(&iter->tracepoint,
2984 iter_mod->tracepoints,
2985 iter_mod->tracepoints
2986 + iter_mod->num_tracepoints);
2987 if (found) {
2988 iter->module = iter_mod;
2989 break;
2993 mutex_unlock(&module_mutex);
2994 return found;
2996 #endif