2 Copyright (C) 2002 Richard Henderson
3 Copyright (C) 2001 Rusty Russell, 2002, 2010 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/export.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/file.h>
26 #include <linux/sysfs.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
29 #include <linux/vmalloc.h>
30 #include <linux/elf.h>
31 #include <linux/proc_fs.h>
32 #include <linux/security.h>
33 #include <linux/seq_file.h>
34 #include <linux/syscalls.h>
35 #include <linux/fcntl.h>
36 #include <linux/rcupdate.h>
37 #include <linux/capability.h>
38 #include <linux/cpu.h>
39 #include <linux/moduleparam.h>
40 #include <linux/errno.h>
41 #include <linux/err.h>
42 #include <linux/vermagic.h>
43 #include <linux/notifier.h>
44 #include <linux/sched.h>
45 #include <linux/stop_machine.h>
46 #include <linux/device.h>
47 #include <linux/string.h>
48 #include <linux/mutex.h>
49 #include <linux/rculist.h>
50 #include <asm/uaccess.h>
51 #include <asm/cacheflush.h>
52 #include <asm/mmu_context.h>
53 #include <linux/license.h>
54 #include <asm/sections.h>
55 #include <linux/tracepoint.h>
56 #include <linux/ftrace.h>
57 #include <linux/async.h>
58 #include <linux/percpu.h>
59 #include <linux/kmemleak.h>
60 #include <linux/jump_label.h>
61 #include <linux/pfn.h>
62 #include <linux/bsearch.h>
63 #include <linux/fips.h>
64 #include <uapi/linux/module.h>
65 #include "module-internal.h"
67 #define CREATE_TRACE_POINTS
68 #include <trace/events/module.h>
70 #ifndef ARCH_SHF_SMALL
71 #define ARCH_SHF_SMALL 0
75 * Modules' sections will be aligned on page boundaries
76 * to ensure complete separation of code and data, but
77 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
79 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
80 # define debug_align(X) ALIGN(X, PAGE_SIZE)
82 # define debug_align(X) (X)
86 * Given BASE and SIZE this macro calculates the number of pages the
87 * memory regions occupies
89 #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
90 (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
91 PFN_DOWN((unsigned long)BASE) + 1) \
94 /* If this is set, the section belongs in the init part of the module */
95 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
99 * 1) List of modules (also safely readable with preempt_disable),
100 * 2) module_use links,
101 * 3) module_addr_min/module_addr_max.
102 * (delete uses stop_machine/add uses RCU list operations). */
103 DEFINE_MUTEX(module_mutex);
104 EXPORT_SYMBOL_GPL(module_mutex);
105 static LIST_HEAD(modules);
106 #ifdef CONFIG_KGDB_KDB
107 struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
108 #endif /* CONFIG_KGDB_KDB */
110 #ifdef CONFIG_MODULE_SIG
111 #ifdef CONFIG_MODULE_SIG_FORCE
112 static bool sig_enforce = true;
114 static bool sig_enforce = false;
116 static int param_set_bool_enable_only(const char *val,
117 const struct kernel_param *kp)
121 struct kernel_param dummy_kp = *kp;
123 dummy_kp.arg = &test;
125 err = param_set_bool(val, &dummy_kp);
129 /* Don't let them unset it once it's set! */
130 if (!test && sig_enforce)
138 static const struct kernel_param_ops param_ops_bool_enable_only = {
139 .set = param_set_bool_enable_only,
140 .get = param_get_bool,
142 #define param_check_bool_enable_only param_check_bool
144 module_param(sig_enforce, bool_enable_only, 0644);
145 #endif /* !CONFIG_MODULE_SIG_FORCE */
146 #endif /* CONFIG_MODULE_SIG */
148 /* Block module loading/unloading? */
149 int modules_disabled = 0;
150 core_param(nomodule, modules_disabled, bint, 0);
152 /* Waiting for a module to finish initializing? */
153 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
155 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
157 /* Bounds of module allocation, for speeding __module_address.
158 * Protected by module_mutex. */
159 static unsigned long module_addr_min = -1UL, module_addr_max = 0;
161 int register_module_notifier(struct notifier_block * nb)
163 return blocking_notifier_chain_register(&module_notify_list, nb);
165 EXPORT_SYMBOL(register_module_notifier);
167 int unregister_module_notifier(struct notifier_block * nb)
169 return blocking_notifier_chain_unregister(&module_notify_list, nb);
171 EXPORT_SYMBOL(unregister_module_notifier);
177 char *secstrings, *strtab;
178 unsigned long symoffs, stroffs;
179 struct _ddebug *debug;
180 unsigned int num_debug;
183 unsigned int sym, str, mod, vers, info, pcpu;
187 /* We require a truly strong try_module_get(): 0 means failure due to
188 ongoing or failed initialization etc. */
189 static inline int strong_try_module_get(struct module *mod)
191 if (mod && mod->state == MODULE_STATE_COMING)
193 if (try_module_get(mod))
199 static inline void add_taint_module(struct module *mod, unsigned flag)
202 mod->taints |= (1U << flag);
206 * A thread that wants to hold a reference to a module only while it
207 * is running can call this to safely exit. nfsd and lockd use this.
209 void __module_put_and_exit(struct module *mod, long code)
214 EXPORT_SYMBOL(__module_put_and_exit);
216 /* Find a module section: 0 means not found. */
217 static unsigned int find_sec(const struct load_info *info, const char *name)
221 for (i = 1; i < info->hdr->e_shnum; i++) {
222 Elf_Shdr *shdr = &info->sechdrs[i];
223 /* Alloc bit cleared means "ignore it." */
224 if ((shdr->sh_flags & SHF_ALLOC)
225 && strcmp(info->secstrings + shdr->sh_name, name) == 0)
231 /* Find a module section, or NULL. */
232 static void *section_addr(const struct load_info *info, const char *name)
234 /* Section 0 has sh_addr 0. */
235 return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
238 /* Find a module section, or NULL. Fill in number of "objects" in section. */
239 static void *section_objs(const struct load_info *info,
244 unsigned int sec = find_sec(info, name);
246 /* Section 0 has sh_addr 0 and sh_size 0. */
247 *num = info->sechdrs[sec].sh_size / object_size;
248 return (void *)info->sechdrs[sec].sh_addr;
251 /* Provided by the linker */
252 extern const struct kernel_symbol __start___ksymtab[];
253 extern const struct kernel_symbol __stop___ksymtab[];
254 extern const struct kernel_symbol __start___ksymtab_gpl[];
255 extern const struct kernel_symbol __stop___ksymtab_gpl[];
256 extern const struct kernel_symbol __start___ksymtab_gpl_future[];
257 extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
258 extern const unsigned long __start___kcrctab[];
259 extern const unsigned long __start___kcrctab_gpl[];
260 extern const unsigned long __start___kcrctab_gpl_future[];
261 #ifdef CONFIG_UNUSED_SYMBOLS
262 extern const struct kernel_symbol __start___ksymtab_unused[];
263 extern const struct kernel_symbol __stop___ksymtab_unused[];
264 extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
265 extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
266 extern const unsigned long __start___kcrctab_unused[];
267 extern const unsigned long __start___kcrctab_unused_gpl[];
270 #ifndef CONFIG_MODVERSIONS
271 #define symversion(base, idx) NULL
273 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
276 static bool each_symbol_in_section(const struct symsearch *arr,
277 unsigned int arrsize,
278 struct module *owner,
279 bool (*fn)(const struct symsearch *syms,
280 struct module *owner,
286 for (j = 0; j < arrsize; j++) {
287 if (fn(&arr[j], owner, data))
294 /* Returns true as soon as fn returns true, otherwise false. */
295 bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
296 struct module *owner,
301 static const struct symsearch arr[] = {
302 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
303 NOT_GPL_ONLY, false },
304 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
305 __start___kcrctab_gpl,
307 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
308 __start___kcrctab_gpl_future,
309 WILL_BE_GPL_ONLY, false },
310 #ifdef CONFIG_UNUSED_SYMBOLS
311 { __start___ksymtab_unused, __stop___ksymtab_unused,
312 __start___kcrctab_unused,
313 NOT_GPL_ONLY, true },
314 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
315 __start___kcrctab_unused_gpl,
320 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
323 list_for_each_entry_rcu(mod, &modules, list) {
324 struct symsearch arr[] = {
325 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
326 NOT_GPL_ONLY, false },
327 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
330 { mod->gpl_future_syms,
331 mod->gpl_future_syms + mod->num_gpl_future_syms,
332 mod->gpl_future_crcs,
333 WILL_BE_GPL_ONLY, false },
334 #ifdef CONFIG_UNUSED_SYMBOLS
336 mod->unused_syms + mod->num_unused_syms,
338 NOT_GPL_ONLY, true },
339 { mod->unused_gpl_syms,
340 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
341 mod->unused_gpl_crcs,
346 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
351 EXPORT_SYMBOL_GPL(each_symbol_section);
353 struct find_symbol_arg {
360 struct module *owner;
361 const unsigned long *crc;
362 const struct kernel_symbol *sym;
365 static bool check_symbol(const struct symsearch *syms,
366 struct module *owner,
367 unsigned int symnum, void *data)
369 struct find_symbol_arg *fsa = data;
372 if (syms->licence == GPL_ONLY)
374 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
375 printk(KERN_WARNING "Symbol %s is being used "
376 "by a non-GPL module, which will not "
377 "be allowed in the future\n", fsa->name);
378 printk(KERN_WARNING "Please see the file "
379 "Documentation/feature-removal-schedule.txt "
380 "in the kernel source tree for more details.\n");
384 #ifdef CONFIG_UNUSED_SYMBOLS
385 if (syms->unused && fsa->warn) {
386 printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
387 "however this module is using it.\n", fsa->name);
389 "This symbol will go away in the future.\n");
391 "Please evalute if this is the right api to use and if "
392 "it really is, submit a report the linux kernel "
393 "mailinglist together with submitting your code for "
399 fsa->crc = symversion(syms->crcs, symnum);
400 fsa->sym = &syms->start[symnum];
404 static int cmp_name(const void *va, const void *vb)
407 const struct kernel_symbol *b;
409 return strcmp(a, b->name);
412 static bool find_symbol_in_section(const struct symsearch *syms,
413 struct module *owner,
416 struct find_symbol_arg *fsa = data;
417 struct kernel_symbol *sym;
419 sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
420 sizeof(struct kernel_symbol), cmp_name);
422 if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data))
428 /* Find a symbol and return it, along with, (optional) crc and
429 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
430 const struct kernel_symbol *find_symbol(const char *name,
431 struct module **owner,
432 const unsigned long **crc,
436 struct find_symbol_arg fsa;
442 if (each_symbol_section(find_symbol_in_section, &fsa)) {
450 pr_debug("Failed to find symbol %s\n", name);
453 EXPORT_SYMBOL_GPL(find_symbol);
455 /* Search for module by name: must hold module_mutex. */
456 struct module *find_module(const char *name)
460 list_for_each_entry(mod, &modules, list) {
461 if (strcmp(mod->name, name) == 0)
466 EXPORT_SYMBOL_GPL(find_module);
470 static inline void __percpu *mod_percpu(struct module *mod)
475 static int percpu_modalloc(struct module *mod,
476 unsigned long size, unsigned long align)
478 if (align > PAGE_SIZE) {
479 printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
480 mod->name, align, PAGE_SIZE);
484 mod->percpu = __alloc_reserved_percpu(size, align);
487 "%s: Could not allocate %lu bytes percpu data\n",
491 mod->percpu_size = size;
495 static void percpu_modfree(struct module *mod)
497 free_percpu(mod->percpu);
500 static unsigned int find_pcpusec(struct load_info *info)
502 return find_sec(info, ".data..percpu");
505 static void percpu_modcopy(struct module *mod,
506 const void *from, unsigned long size)
510 for_each_possible_cpu(cpu)
511 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
515 * is_module_percpu_address - test whether address is from module static percpu
516 * @addr: address to test
518 * Test whether @addr belongs to module static percpu area.
521 * %true if @addr is from module static percpu area
523 bool is_module_percpu_address(unsigned long addr)
530 list_for_each_entry_rcu(mod, &modules, list) {
531 if (!mod->percpu_size)
533 for_each_possible_cpu(cpu) {
534 void *start = per_cpu_ptr(mod->percpu, cpu);
536 if ((void *)addr >= start &&
537 (void *)addr < start + mod->percpu_size) {
548 #else /* ... !CONFIG_SMP */
550 static inline void __percpu *mod_percpu(struct module *mod)
554 static inline int percpu_modalloc(struct module *mod,
555 unsigned long size, unsigned long align)
559 static inline void percpu_modfree(struct module *mod)
562 static unsigned int find_pcpusec(struct load_info *info)
566 static inline void percpu_modcopy(struct module *mod,
567 const void *from, unsigned long size)
569 /* pcpusec should be 0, and size of that section should be 0. */
572 bool is_module_percpu_address(unsigned long addr)
577 #endif /* CONFIG_SMP */
579 #define MODINFO_ATTR(field) \
580 static void setup_modinfo_##field(struct module *mod, const char *s) \
582 mod->field = kstrdup(s, GFP_KERNEL); \
584 static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
585 struct module_kobject *mk, char *buffer) \
587 return sprintf(buffer, "%s\n", mk->mod->field); \
589 static int modinfo_##field##_exists(struct module *mod) \
591 return mod->field != NULL; \
593 static void free_modinfo_##field(struct module *mod) \
598 static struct module_attribute modinfo_##field = { \
599 .attr = { .name = __stringify(field), .mode = 0444 }, \
600 .show = show_modinfo_##field, \
601 .setup = setup_modinfo_##field, \
602 .test = modinfo_##field##_exists, \
603 .free = free_modinfo_##field, \
606 MODINFO_ATTR(version);
607 MODINFO_ATTR(srcversion);
609 static char last_unloaded_module[MODULE_NAME_LEN+1];
611 #ifdef CONFIG_MODULE_UNLOAD
613 EXPORT_TRACEPOINT_SYMBOL(module_get);
615 /* Init the unload section of the module. */
616 static int module_unload_init(struct module *mod)
618 mod->refptr = alloc_percpu(struct module_ref);
622 INIT_LIST_HEAD(&mod->source_list);
623 INIT_LIST_HEAD(&mod->target_list);
625 /* Hold reference count during initialization. */
626 __this_cpu_write(mod->refptr->incs, 1);
627 /* Backwards compatibility macros put refcount during init. */
628 mod->waiter = current;
633 /* Does a already use b? */
634 static int already_uses(struct module *a, struct module *b)
636 struct module_use *use;
638 list_for_each_entry(use, &b->source_list, source_list) {
639 if (use->source == a) {
640 pr_debug("%s uses %s!\n", a->name, b->name);
644 pr_debug("%s does not use %s!\n", a->name, b->name);
650 * - we add 'a' as a "source", 'b' as a "target" of module use
651 * - the module_use is added to the list of 'b' sources (so
652 * 'b' can walk the list to see who sourced them), and of 'a'
653 * targets (so 'a' can see what modules it targets).
655 static int add_module_usage(struct module *a, struct module *b)
657 struct module_use *use;
659 pr_debug("Allocating new usage for %s.\n", a->name);
660 use = kmalloc(sizeof(*use), GFP_ATOMIC);
662 printk(KERN_WARNING "%s: out of memory loading\n", a->name);
668 list_add(&use->source_list, &b->source_list);
669 list_add(&use->target_list, &a->target_list);
673 /* Module a uses b: caller needs module_mutex() */
674 int ref_module(struct module *a, struct module *b)
678 if (b == NULL || already_uses(a, b))
681 /* If module isn't available, we fail. */
682 err = strong_try_module_get(b);
686 err = add_module_usage(a, b);
693 EXPORT_SYMBOL_GPL(ref_module);
695 /* Clear the unload stuff of the module. */
696 static void module_unload_free(struct module *mod)
698 struct module_use *use, *tmp;
700 mutex_lock(&module_mutex);
701 list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
702 struct module *i = use->target;
703 pr_debug("%s unusing %s\n", mod->name, i->name);
705 list_del(&use->source_list);
706 list_del(&use->target_list);
709 mutex_unlock(&module_mutex);
711 free_percpu(mod->refptr);
714 #ifdef CONFIG_MODULE_FORCE_UNLOAD
715 static inline int try_force_unload(unsigned int flags)
717 int ret = (flags & O_TRUNC);
719 add_taint(TAINT_FORCED_RMMOD);
723 static inline int try_force_unload(unsigned int flags)
727 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
736 /* Whole machine is stopped with interrupts off when this runs. */
737 static int __try_stop_module(void *_sref)
739 struct stopref *sref = _sref;
741 /* If it's not unused, quit unless we're forcing. */
742 if (module_refcount(sref->mod) != 0) {
743 if (!(*sref->forced = try_force_unload(sref->flags)))
747 /* Mark it as dying. */
748 sref->mod->state = MODULE_STATE_GOING;
752 static int try_stop_module(struct module *mod, int flags, int *forced)
754 if (flags & O_NONBLOCK) {
755 struct stopref sref = { mod, flags, forced };
757 return stop_machine(__try_stop_module, &sref, NULL);
759 /* We don't need to stop the machine for this. */
760 mod->state = MODULE_STATE_GOING;
766 unsigned long module_refcount(struct module *mod)
768 unsigned long incs = 0, decs = 0;
771 for_each_possible_cpu(cpu)
772 decs += per_cpu_ptr(mod->refptr, cpu)->decs;
774 * ensure the incs are added up after the decs.
775 * module_put ensures incs are visible before decs with smp_wmb.
777 * This 2-count scheme avoids the situation where the refcount
778 * for CPU0 is read, then CPU0 increments the module refcount,
779 * then CPU1 drops that refcount, then the refcount for CPU1 is
780 * read. We would record a decrement but not its corresponding
781 * increment so we would see a low count (disaster).
783 * Rare situation? But module_refcount can be preempted, and we
784 * might be tallying up 4096+ CPUs. So it is not impossible.
787 for_each_possible_cpu(cpu)
788 incs += per_cpu_ptr(mod->refptr, cpu)->incs;
791 EXPORT_SYMBOL(module_refcount);
793 /* This exists whether we can unload or not */
794 static void free_module(struct module *mod);
796 static void wait_for_zero_refcount(struct module *mod)
798 /* Since we might sleep for some time, release the mutex first */
799 mutex_unlock(&module_mutex);
801 pr_debug("Looking at refcount...\n");
802 set_current_state(TASK_UNINTERRUPTIBLE);
803 if (module_refcount(mod) == 0)
807 current->state = TASK_RUNNING;
808 mutex_lock(&module_mutex);
811 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
815 char name[MODULE_NAME_LEN];
818 if (!capable(CAP_SYS_MODULE) || modules_disabled)
821 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
823 name[MODULE_NAME_LEN-1] = '\0';
825 if (mutex_lock_interruptible(&module_mutex) != 0)
828 mod = find_module(name);
834 if (!list_empty(&mod->source_list)) {
835 /* Other modules depend on us: get rid of them first. */
840 /* Doing init or already dying? */
841 if (mod->state != MODULE_STATE_LIVE) {
842 /* FIXME: if (force), slam module count and wake up
844 pr_debug("%s already dying\n", mod->name);
849 /* If it has an init func, it must have an exit func to unload */
850 if (mod->init && !mod->exit) {
851 forced = try_force_unload(flags);
853 /* This module can't be removed */
859 /* Set this up before setting mod->state */
860 mod->waiter = current;
862 /* Stop the machine so refcounts can't move and disable module. */
863 ret = try_stop_module(mod, flags, &forced);
867 /* Never wait if forced. */
868 if (!forced && module_refcount(mod) != 0)
869 wait_for_zero_refcount(mod);
871 mutex_unlock(&module_mutex);
872 /* Final destruction now no one is using it. */
873 if (mod->exit != NULL)
875 blocking_notifier_call_chain(&module_notify_list,
876 MODULE_STATE_GOING, mod);
877 async_synchronize_full();
879 /* Store the name of the last unloaded module for diagnostic purposes */
880 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
885 mutex_unlock(&module_mutex);
889 static inline void print_unload_info(struct seq_file *m, struct module *mod)
891 struct module_use *use;
892 int printed_something = 0;
894 seq_printf(m, " %lu ", module_refcount(mod));
896 /* Always include a trailing , so userspace can differentiate
897 between this and the old multi-field proc format. */
898 list_for_each_entry(use, &mod->source_list, source_list) {
899 printed_something = 1;
900 seq_printf(m, "%s,", use->source->name);
903 if (mod->init != NULL && mod->exit == NULL) {
904 printed_something = 1;
905 seq_printf(m, "[permanent],");
908 if (!printed_something)
912 void __symbol_put(const char *symbol)
914 struct module *owner;
917 if (!find_symbol(symbol, &owner, NULL, true, false))
922 EXPORT_SYMBOL(__symbol_put);
924 /* Note this assumes addr is a function, which it currently always is. */
925 void symbol_put_addr(void *addr)
927 struct module *modaddr;
928 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
930 if (core_kernel_text(a))
933 /* module_text_address is safe here: we're supposed to have reference
934 * to module from symbol_get, so it can't go away. */
935 modaddr = __module_text_address(a);
939 EXPORT_SYMBOL_GPL(symbol_put_addr);
941 static ssize_t show_refcnt(struct module_attribute *mattr,
942 struct module_kobject *mk, char *buffer)
944 return sprintf(buffer, "%lu\n", module_refcount(mk->mod));
947 static struct module_attribute modinfo_refcnt =
948 __ATTR(refcnt, 0444, show_refcnt, NULL);
950 void __module_get(struct module *module)
954 __this_cpu_inc(module->refptr->incs);
955 trace_module_get(module, _RET_IP_);
959 EXPORT_SYMBOL(__module_get);
961 bool try_module_get(struct module *module)
968 if (likely(module_is_live(module))) {
969 __this_cpu_inc(module->refptr->incs);
970 trace_module_get(module, _RET_IP_);
978 EXPORT_SYMBOL(try_module_get);
980 void module_put(struct module *module)
984 smp_wmb(); /* see comment in module_refcount */
985 __this_cpu_inc(module->refptr->decs);
987 trace_module_put(module, _RET_IP_);
988 /* Maybe they're waiting for us to drop reference? */
989 if (unlikely(!module_is_live(module)))
990 wake_up_process(module->waiter);
994 EXPORT_SYMBOL(module_put);
996 #else /* !CONFIG_MODULE_UNLOAD */
997 static inline void print_unload_info(struct seq_file *m, struct module *mod)
999 /* We don't know the usage count, or what modules are using. */
1000 seq_printf(m, " - -");
1003 static inline void module_unload_free(struct module *mod)
1007 int ref_module(struct module *a, struct module *b)
1009 return strong_try_module_get(b);
1011 EXPORT_SYMBOL_GPL(ref_module);
1013 static inline int module_unload_init(struct module *mod)
1017 #endif /* CONFIG_MODULE_UNLOAD */
1019 static size_t module_flags_taint(struct module *mod, char *buf)
1023 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
1025 if (mod->taints & (1 << TAINT_OOT_MODULE))
1027 if (mod->taints & (1 << TAINT_FORCED_MODULE))
1029 if (mod->taints & (1 << TAINT_CRAP))
1032 * TAINT_FORCED_RMMOD: could be added.
1033 * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
1039 static ssize_t show_initstate(struct module_attribute *mattr,
1040 struct module_kobject *mk, char *buffer)
1042 const char *state = "unknown";
1044 switch (mk->mod->state) {
1045 case MODULE_STATE_LIVE:
1048 case MODULE_STATE_COMING:
1051 case MODULE_STATE_GOING:
1055 return sprintf(buffer, "%s\n", state);
1058 static struct module_attribute modinfo_initstate =
1059 __ATTR(initstate, 0444, show_initstate, NULL);
1061 static ssize_t store_uevent(struct module_attribute *mattr,
1062 struct module_kobject *mk,
1063 const char *buffer, size_t count)
1065 enum kobject_action action;
1067 if (kobject_action_type(buffer, count, &action) == 0)
1068 kobject_uevent(&mk->kobj, action);
1072 struct module_attribute module_uevent =
1073 __ATTR(uevent, 0200, NULL, store_uevent);
1075 static ssize_t show_coresize(struct module_attribute *mattr,
1076 struct module_kobject *mk, char *buffer)
1078 return sprintf(buffer, "%u\n", mk->mod->core_size);
1081 static struct module_attribute modinfo_coresize =
1082 __ATTR(coresize, 0444, show_coresize, NULL);
1084 static ssize_t show_initsize(struct module_attribute *mattr,
1085 struct module_kobject *mk, char *buffer)
1087 return sprintf(buffer, "%u\n", mk->mod->init_size);
1090 static struct module_attribute modinfo_initsize =
1091 __ATTR(initsize, 0444, show_initsize, NULL);
1093 static ssize_t show_taint(struct module_attribute *mattr,
1094 struct module_kobject *mk, char *buffer)
1098 l = module_flags_taint(mk->mod, buffer);
1103 static struct module_attribute modinfo_taint =
1104 __ATTR(taint, 0444, show_taint, NULL);
1106 static struct module_attribute *modinfo_attrs[] = {
1109 &modinfo_srcversion,
1114 #ifdef CONFIG_MODULE_UNLOAD
1120 static const char vermagic[] = VERMAGIC_STRING;
1122 static int try_to_force_load(struct module *mod, const char *reason)
1124 #ifdef CONFIG_MODULE_FORCE_LOAD
1125 if (!test_taint(TAINT_FORCED_MODULE))
1126 printk(KERN_WARNING "%s: %s: kernel tainted.\n",
1128 add_taint_module(mod, TAINT_FORCED_MODULE);
1135 #ifdef CONFIG_MODVERSIONS
1136 /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1137 static unsigned long maybe_relocated(unsigned long crc,
1138 const struct module *crc_owner)
1140 #ifdef ARCH_RELOCATES_KCRCTAB
1141 if (crc_owner == NULL)
1142 return crc - (unsigned long)reloc_start;
1147 static int check_version(Elf_Shdr *sechdrs,
1148 unsigned int versindex,
1149 const char *symname,
1151 const unsigned long *crc,
1152 const struct module *crc_owner)
1154 unsigned int i, num_versions;
1155 struct modversion_info *versions;
1157 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1161 /* No versions at all? modprobe --force does this. */
1163 return try_to_force_load(mod, symname) == 0;
1165 versions = (void *) sechdrs[versindex].sh_addr;
1166 num_versions = sechdrs[versindex].sh_size
1167 / sizeof(struct modversion_info);
1169 for (i = 0; i < num_versions; i++) {
1170 if (strcmp(versions[i].name, symname) != 0)
1173 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
1175 pr_debug("Found checksum %lX vs module %lX\n",
1176 maybe_relocated(*crc, crc_owner), versions[i].crc);
1180 printk(KERN_WARNING "%s: no symbol version for %s\n",
1181 mod->name, symname);
1185 printk("%s: disagrees about version of symbol %s\n",
1186 mod->name, symname);
1190 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1191 unsigned int versindex,
1194 const unsigned long *crc;
1196 /* Since this should be found in kernel (which can't be removed),
1197 * no locking is necessary. */
1198 if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL,
1201 return check_version(sechdrs, versindex, "module_layout", mod, crc,
1205 /* First part is kernel version, which we ignore if module has crcs. */
1206 static inline int same_magic(const char *amagic, const char *bmagic,
1210 amagic += strcspn(amagic, " ");
1211 bmagic += strcspn(bmagic, " ");
1213 return strcmp(amagic, bmagic) == 0;
1216 static inline int check_version(Elf_Shdr *sechdrs,
1217 unsigned int versindex,
1218 const char *symname,
1220 const unsigned long *crc,
1221 const struct module *crc_owner)
1226 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1227 unsigned int versindex,
1233 static inline int same_magic(const char *amagic, const char *bmagic,
1236 return strcmp(amagic, bmagic) == 0;
1238 #endif /* CONFIG_MODVERSIONS */
1240 /* Resolve a symbol for this module. I.e. if we find one, record usage. */
1241 static const struct kernel_symbol *resolve_symbol(struct module *mod,
1242 const struct load_info *info,
1246 struct module *owner;
1247 const struct kernel_symbol *sym;
1248 const unsigned long *crc;
1251 mutex_lock(&module_mutex);
1252 sym = find_symbol(name, &owner, &crc,
1253 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
1257 if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
1259 sym = ERR_PTR(-EINVAL);
1263 err = ref_module(mod, owner);
1270 /* We must make copy under the lock if we failed to get ref. */
1271 strncpy(ownername, module_name(owner), MODULE_NAME_LEN);
1273 mutex_unlock(&module_mutex);
1277 static const struct kernel_symbol *
1278 resolve_symbol_wait(struct module *mod,
1279 const struct load_info *info,
1282 const struct kernel_symbol *ksym;
1283 char owner[MODULE_NAME_LEN];
1285 if (wait_event_interruptible_timeout(module_wq,
1286 !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
1287 || PTR_ERR(ksym) != -EBUSY,
1289 printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
1296 * /sys/module/foo/sections stuff
1297 * J. Corbet <corbet@lwn.net>
1301 #ifdef CONFIG_KALLSYMS
1302 static inline bool sect_empty(const Elf_Shdr *sect)
1304 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1307 struct module_sect_attr
1309 struct module_attribute mattr;
1311 unsigned long address;
1314 struct module_sect_attrs
1316 struct attribute_group grp;
1317 unsigned int nsections;
1318 struct module_sect_attr attrs[0];
1321 static ssize_t module_sect_show(struct module_attribute *mattr,
1322 struct module_kobject *mk, char *buf)
1324 struct module_sect_attr *sattr =
1325 container_of(mattr, struct module_sect_attr, mattr);
1326 return sprintf(buf, "0x%pK\n", (void *)sattr->address);
1329 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1331 unsigned int section;
1333 for (section = 0; section < sect_attrs->nsections; section++)
1334 kfree(sect_attrs->attrs[section].name);
1338 static void add_sect_attrs(struct module *mod, const struct load_info *info)
1340 unsigned int nloaded = 0, i, size[2];
1341 struct module_sect_attrs *sect_attrs;
1342 struct module_sect_attr *sattr;
1343 struct attribute **gattr;
1345 /* Count loaded sections and allocate structures */
1346 for (i = 0; i < info->hdr->e_shnum; i++)
1347 if (!sect_empty(&info->sechdrs[i]))
1349 size[0] = ALIGN(sizeof(*sect_attrs)
1350 + nloaded * sizeof(sect_attrs->attrs[0]),
1351 sizeof(sect_attrs->grp.attrs[0]));
1352 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
1353 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1354 if (sect_attrs == NULL)
1357 /* Setup section attributes. */
1358 sect_attrs->grp.name = "sections";
1359 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1361 sect_attrs->nsections = 0;
1362 sattr = §_attrs->attrs[0];
1363 gattr = §_attrs->grp.attrs[0];
1364 for (i = 0; i < info->hdr->e_shnum; i++) {
1365 Elf_Shdr *sec = &info->sechdrs[i];
1366 if (sect_empty(sec))
1368 sattr->address = sec->sh_addr;
1369 sattr->name = kstrdup(info->secstrings + sec->sh_name,
1371 if (sattr->name == NULL)
1373 sect_attrs->nsections++;
1374 sysfs_attr_init(&sattr->mattr.attr);
1375 sattr->mattr.show = module_sect_show;
1376 sattr->mattr.store = NULL;
1377 sattr->mattr.attr.name = sattr->name;
1378 sattr->mattr.attr.mode = S_IRUGO;
1379 *(gattr++) = &(sattr++)->mattr.attr;
1383 if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
1386 mod->sect_attrs = sect_attrs;
1389 free_sect_attrs(sect_attrs);
1392 static void remove_sect_attrs(struct module *mod)
1394 if (mod->sect_attrs) {
1395 sysfs_remove_group(&mod->mkobj.kobj,
1396 &mod->sect_attrs->grp);
1397 /* We are positive that no one is using any sect attrs
1398 * at this point. Deallocate immediately. */
1399 free_sect_attrs(mod->sect_attrs);
1400 mod->sect_attrs = NULL;
1405 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1408 struct module_notes_attrs {
1409 struct kobject *dir;
1411 struct bin_attribute attrs[0];
1414 static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
1415 struct bin_attribute *bin_attr,
1416 char *buf, loff_t pos, size_t count)
1419 * The caller checked the pos and count against our size.
1421 memcpy(buf, bin_attr->private + pos, count);
1425 static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1428 if (notes_attrs->dir) {
1430 sysfs_remove_bin_file(notes_attrs->dir,
1431 ¬es_attrs->attrs[i]);
1432 kobject_put(notes_attrs->dir);
1437 static void add_notes_attrs(struct module *mod, const struct load_info *info)
1439 unsigned int notes, loaded, i;
1440 struct module_notes_attrs *notes_attrs;
1441 struct bin_attribute *nattr;
1443 /* failed to create section attributes, so can't create notes */
1444 if (!mod->sect_attrs)
1447 /* Count notes sections and allocate structures. */
1449 for (i = 0; i < info->hdr->e_shnum; i++)
1450 if (!sect_empty(&info->sechdrs[i]) &&
1451 (info->sechdrs[i].sh_type == SHT_NOTE))
1457 notes_attrs = kzalloc(sizeof(*notes_attrs)
1458 + notes * sizeof(notes_attrs->attrs[0]),
1460 if (notes_attrs == NULL)
1463 notes_attrs->notes = notes;
1464 nattr = ¬es_attrs->attrs[0];
1465 for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
1466 if (sect_empty(&info->sechdrs[i]))
1468 if (info->sechdrs[i].sh_type == SHT_NOTE) {
1469 sysfs_bin_attr_init(nattr);
1470 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1471 nattr->attr.mode = S_IRUGO;
1472 nattr->size = info->sechdrs[i].sh_size;
1473 nattr->private = (void *) info->sechdrs[i].sh_addr;
1474 nattr->read = module_notes_read;
1480 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
1481 if (!notes_attrs->dir)
1484 for (i = 0; i < notes; ++i)
1485 if (sysfs_create_bin_file(notes_attrs->dir,
1486 ¬es_attrs->attrs[i]))
1489 mod->notes_attrs = notes_attrs;
1493 free_notes_attrs(notes_attrs, i);
1496 static void remove_notes_attrs(struct module *mod)
1498 if (mod->notes_attrs)
1499 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1504 static inline void add_sect_attrs(struct module *mod,
1505 const struct load_info *info)
1509 static inline void remove_sect_attrs(struct module *mod)
1513 static inline void add_notes_attrs(struct module *mod,
1514 const struct load_info *info)
1518 static inline void remove_notes_attrs(struct module *mod)
1521 #endif /* CONFIG_KALLSYMS */
1523 static void add_usage_links(struct module *mod)
1525 #ifdef CONFIG_MODULE_UNLOAD
1526 struct module_use *use;
1529 mutex_lock(&module_mutex);
1530 list_for_each_entry(use, &mod->target_list, target_list) {
1531 nowarn = sysfs_create_link(use->target->holders_dir,
1532 &mod->mkobj.kobj, mod->name);
1534 mutex_unlock(&module_mutex);
1538 static void del_usage_links(struct module *mod)
1540 #ifdef CONFIG_MODULE_UNLOAD
1541 struct module_use *use;
1543 mutex_lock(&module_mutex);
1544 list_for_each_entry(use, &mod->target_list, target_list)
1545 sysfs_remove_link(use->target->holders_dir, mod->name);
1546 mutex_unlock(&module_mutex);
1550 static int module_add_modinfo_attrs(struct module *mod)
1552 struct module_attribute *attr;
1553 struct module_attribute *temp_attr;
1557 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1558 (ARRAY_SIZE(modinfo_attrs) + 1)),
1560 if (!mod->modinfo_attrs)
1563 temp_attr = mod->modinfo_attrs;
1564 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1566 (attr->test && attr->test(mod))) {
1567 memcpy(temp_attr, attr, sizeof(*temp_attr));
1568 sysfs_attr_init(&temp_attr->attr);
1569 error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
1576 static void module_remove_modinfo_attrs(struct module *mod)
1578 struct module_attribute *attr;
1581 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1582 /* pick a field to test for end of list */
1583 if (!attr->attr.name)
1585 sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
1589 kfree(mod->modinfo_attrs);
1592 static int mod_sysfs_init(struct module *mod)
1595 struct kobject *kobj;
1597 if (!module_sysfs_initialized) {
1598 printk(KERN_ERR "%s: module sysfs not initialized\n",
1604 kobj = kset_find_obj(module_kset, mod->name);
1606 printk(KERN_ERR "%s: module is already loaded\n", mod->name);
1612 mod->mkobj.mod = mod;
1614 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1615 mod->mkobj.kobj.kset = module_kset;
1616 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1619 kobject_put(&mod->mkobj.kobj);
1621 /* delay uevent until full sysfs population */
1626 static int mod_sysfs_setup(struct module *mod,
1627 const struct load_info *info,
1628 struct kernel_param *kparam,
1629 unsigned int num_params)
1633 err = mod_sysfs_init(mod);
1637 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
1638 if (!mod->holders_dir) {
1643 err = module_param_sysfs_setup(mod, kparam, num_params);
1645 goto out_unreg_holders;
1647 err = module_add_modinfo_attrs(mod);
1649 goto out_unreg_param;
1651 add_usage_links(mod);
1652 add_sect_attrs(mod, info);
1653 add_notes_attrs(mod, info);
1655 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
1659 module_param_sysfs_remove(mod);
1661 kobject_put(mod->holders_dir);
1663 kobject_put(&mod->mkobj.kobj);
1668 static void mod_sysfs_fini(struct module *mod)
1670 remove_notes_attrs(mod);
1671 remove_sect_attrs(mod);
1672 kobject_put(&mod->mkobj.kobj);
1675 #else /* !CONFIG_SYSFS */
1677 static int mod_sysfs_setup(struct module *mod,
1678 const struct load_info *info,
1679 struct kernel_param *kparam,
1680 unsigned int num_params)
1685 static void mod_sysfs_fini(struct module *mod)
1689 static void module_remove_modinfo_attrs(struct module *mod)
1693 static void del_usage_links(struct module *mod)
1697 #endif /* CONFIG_SYSFS */
1699 static void mod_sysfs_teardown(struct module *mod)
1701 del_usage_links(mod);
1702 module_remove_modinfo_attrs(mod);
1703 module_param_sysfs_remove(mod);
1704 kobject_put(mod->mkobj.drivers_dir);
1705 kobject_put(mod->holders_dir);
1706 mod_sysfs_fini(mod);
1710 * unlink the module with the whole machine is stopped with interrupts off
1711 * - this defends against kallsyms not taking locks
1713 static int __unlink_module(void *_mod)
1715 struct module *mod = _mod;
1716 list_del(&mod->list);
1717 module_bug_cleanup(mod);
1721 #ifdef CONFIG_DEBUG_SET_MODULE_RONX
1723 * LKM RO/NX protection: protect module's text/ro-data
1724 * from modification and any data from execution.
1726 void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages))
1728 unsigned long begin_pfn = PFN_DOWN((unsigned long)start);
1729 unsigned long end_pfn = PFN_DOWN((unsigned long)end);
1731 if (end_pfn > begin_pfn)
1732 set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1735 static void set_section_ro_nx(void *base,
1736 unsigned long text_size,
1737 unsigned long ro_size,
1738 unsigned long total_size)
1740 /* begin and end PFNs of the current subsection */
1741 unsigned long begin_pfn;
1742 unsigned long end_pfn;
1745 * Set RO for module text and RO-data:
1746 * - Always protect first page.
1747 * - Do not protect last partial page.
1750 set_page_attributes(base, base + ro_size, set_memory_ro);
1753 * Set NX permissions for module data:
1754 * - Do not protect first partial page.
1755 * - Always protect last page.
1757 if (total_size > text_size) {
1758 begin_pfn = PFN_UP((unsigned long)base + text_size);
1759 end_pfn = PFN_UP((unsigned long)base + total_size);
1760 if (end_pfn > begin_pfn)
1761 set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1765 static void unset_module_core_ro_nx(struct module *mod)
1767 set_page_attributes(mod->module_core + mod->core_text_size,
1768 mod->module_core + mod->core_size,
1770 set_page_attributes(mod->module_core,
1771 mod->module_core + mod->core_ro_size,
1775 static void unset_module_init_ro_nx(struct module *mod)
1777 set_page_attributes(mod->module_init + mod->init_text_size,
1778 mod->module_init + mod->init_size,
1780 set_page_attributes(mod->module_init,
1781 mod->module_init + mod->init_ro_size,
1785 /* Iterate through all modules and set each module's text as RW */
1786 void set_all_modules_text_rw(void)
1790 mutex_lock(&module_mutex);
1791 list_for_each_entry_rcu(mod, &modules, list) {
1792 if ((mod->module_core) && (mod->core_text_size)) {
1793 set_page_attributes(mod->module_core,
1794 mod->module_core + mod->core_text_size,
1797 if ((mod->module_init) && (mod->init_text_size)) {
1798 set_page_attributes(mod->module_init,
1799 mod->module_init + mod->init_text_size,
1803 mutex_unlock(&module_mutex);
1806 /* Iterate through all modules and set each module's text as RO */
1807 void set_all_modules_text_ro(void)
1811 mutex_lock(&module_mutex);
1812 list_for_each_entry_rcu(mod, &modules, list) {
1813 if ((mod->module_core) && (mod->core_text_size)) {
1814 set_page_attributes(mod->module_core,
1815 mod->module_core + mod->core_text_size,
1818 if ((mod->module_init) && (mod->init_text_size)) {
1819 set_page_attributes(mod->module_init,
1820 mod->module_init + mod->init_text_size,
1824 mutex_unlock(&module_mutex);
1827 static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { }
1828 static void unset_module_core_ro_nx(struct module *mod) { }
1829 static void unset_module_init_ro_nx(struct module *mod) { }
1832 void __weak module_free(struct module *mod, void *module_region)
1834 vfree(module_region);
1837 void __weak module_arch_cleanup(struct module *mod)
1841 /* Free a module, remove from lists, etc. */
1842 static void free_module(struct module *mod)
1844 trace_module_free(mod);
1846 /* Delete from various lists */
1847 mutex_lock(&module_mutex);
1848 stop_machine(__unlink_module, mod, NULL);
1849 mutex_unlock(&module_mutex);
1850 mod_sysfs_teardown(mod);
1852 /* Remove dynamic debug info */
1853 ddebug_remove_module(mod->name);
1855 /* Arch-specific cleanup. */
1856 module_arch_cleanup(mod);
1858 /* Module unload stuff */
1859 module_unload_free(mod);
1861 /* Free any allocated parameters. */
1862 destroy_params(mod->kp, mod->num_kp);
1864 /* This may be NULL, but that's OK */
1865 unset_module_init_ro_nx(mod);
1866 module_free(mod, mod->module_init);
1868 percpu_modfree(mod);
1870 /* Free lock-classes: */
1871 lockdep_free_key_range(mod->module_core, mod->core_size);
1873 /* Finally, free the core (containing the module structure) */
1874 unset_module_core_ro_nx(mod);
1875 module_free(mod, mod->module_core);
1878 update_protections(current->mm);
1882 void *__symbol_get(const char *symbol)
1884 struct module *owner;
1885 const struct kernel_symbol *sym;
1888 sym = find_symbol(symbol, &owner, NULL, true, true);
1889 if (sym && strong_try_module_get(owner))
1893 return sym ? (void *)sym->value : NULL;
1895 EXPORT_SYMBOL_GPL(__symbol_get);
1898 * Ensure that an exported symbol [global namespace] does not already exist
1899 * in the kernel or in some other module's exported symbol table.
1901 * You must hold the module_mutex.
1903 static int verify_export_symbols(struct module *mod)
1906 struct module *owner;
1907 const struct kernel_symbol *s;
1909 const struct kernel_symbol *sym;
1912 { mod->syms, mod->num_syms },
1913 { mod->gpl_syms, mod->num_gpl_syms },
1914 { mod->gpl_future_syms, mod->num_gpl_future_syms },
1915 #ifdef CONFIG_UNUSED_SYMBOLS
1916 { mod->unused_syms, mod->num_unused_syms },
1917 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
1921 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1922 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1923 if (find_symbol(s->name, &owner, NULL, true, false)) {
1925 "%s: exports duplicate symbol %s"
1927 mod->name, s->name, module_name(owner));
1935 /* Change all symbols so that st_value encodes the pointer directly. */
1936 static int simplify_symbols(struct module *mod, const struct load_info *info)
1938 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
1939 Elf_Sym *sym = (void *)symsec->sh_addr;
1940 unsigned long secbase;
1943 const struct kernel_symbol *ksym;
1945 for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
1946 const char *name = info->strtab + sym[i].st_name;
1948 switch (sym[i].st_shndx) {
1950 /* We compiled with -fno-common. These are not
1951 supposed to happen. */
1952 pr_debug("Common symbol: %s\n", name);
1953 printk("%s: please compile with -fno-common\n",
1959 /* Don't need to do anything */
1960 pr_debug("Absolute symbol: 0x%08lx\n",
1961 (long)sym[i].st_value);
1965 ksym = resolve_symbol_wait(mod, info, name);
1966 /* Ok if resolved. */
1967 if (ksym && !IS_ERR(ksym)) {
1968 sym[i].st_value = ksym->value;
1973 if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
1976 printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
1977 mod->name, name, PTR_ERR(ksym));
1978 ret = PTR_ERR(ksym) ?: -ENOENT;
1982 /* Divert to percpu allocation if a percpu var. */
1983 if (sym[i].st_shndx == info->index.pcpu)
1984 secbase = (unsigned long)mod_percpu(mod);
1986 secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
1987 sym[i].st_value += secbase;
1995 static int apply_relocations(struct module *mod, const struct load_info *info)
2000 /* Now do relocations. */
2001 for (i = 1; i < info->hdr->e_shnum; i++) {
2002 unsigned int infosec = info->sechdrs[i].sh_info;
2004 /* Not a valid relocation section? */
2005 if (infosec >= info->hdr->e_shnum)
2008 /* Don't bother with non-allocated sections */
2009 if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
2012 if (info->sechdrs[i].sh_type == SHT_REL)
2013 err = apply_relocate(info->sechdrs, info->strtab,
2014 info->index.sym, i, mod);
2015 else if (info->sechdrs[i].sh_type == SHT_RELA)
2016 err = apply_relocate_add(info->sechdrs, info->strtab,
2017 info->index.sym, i, mod);
2024 /* Additional bytes needed by arch in front of individual sections */
2025 unsigned int __weak arch_mod_section_prepend(struct module *mod,
2026 unsigned int section)
2028 /* default implementation just returns zero */
2032 /* Update size with this section: return offset. */
2033 static long get_offset(struct module *mod, unsigned int *size,
2034 Elf_Shdr *sechdr, unsigned int section)
2038 *size += arch_mod_section_prepend(mod, section);
2039 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
2040 *size = ret + sechdr->sh_size;
2044 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2045 might -- code, read-only data, read-write data, small data. Tally
2046 sizes, and place the offsets into sh_entsize fields: high bit means it
2048 static void layout_sections(struct module *mod, struct load_info *info)
2050 static unsigned long const masks[][2] = {
2051 /* NOTE: all executable code must be the first section
2052 * in this array; otherwise modify the text_size
2053 * finder in the two loops below */
2054 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
2055 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
2056 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
2057 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
2061 for (i = 0; i < info->hdr->e_shnum; i++)
2062 info->sechdrs[i].sh_entsize = ~0UL;
2064 pr_debug("Core section allocation order:\n");
2065 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
2066 for (i = 0; i < info->hdr->e_shnum; ++i) {
2067 Elf_Shdr *s = &info->sechdrs[i];
2068 const char *sname = info->secstrings + s->sh_name;
2070 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2071 || (s->sh_flags & masks[m][1])
2072 || s->sh_entsize != ~0UL
2073 || strstarts(sname, ".init"))
2075 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
2076 pr_debug("\t%s\n", sname);
2079 case 0: /* executable */
2080 mod->core_size = debug_align(mod->core_size);
2081 mod->core_text_size = mod->core_size;
2083 case 1: /* RO: text and ro-data */
2084 mod->core_size = debug_align(mod->core_size);
2085 mod->core_ro_size = mod->core_size;
2087 case 3: /* whole core */
2088 mod->core_size = debug_align(mod->core_size);
2093 pr_debug("Init section allocation order:\n");
2094 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
2095 for (i = 0; i < info->hdr->e_shnum; ++i) {
2096 Elf_Shdr *s = &info->sechdrs[i];
2097 const char *sname = info->secstrings + s->sh_name;
2099 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2100 || (s->sh_flags & masks[m][1])
2101 || s->sh_entsize != ~0UL
2102 || !strstarts(sname, ".init"))
2104 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
2105 | INIT_OFFSET_MASK);
2106 pr_debug("\t%s\n", sname);
2109 case 0: /* executable */
2110 mod->init_size = debug_align(mod->init_size);
2111 mod->init_text_size = mod->init_size;
2113 case 1: /* RO: text and ro-data */
2114 mod->init_size = debug_align(mod->init_size);
2115 mod->init_ro_size = mod->init_size;
2117 case 3: /* whole init */
2118 mod->init_size = debug_align(mod->init_size);
2124 static void set_license(struct module *mod, const char *license)
2127 license = "unspecified";
2129 if (!license_is_gpl_compatible(license)) {
2130 if (!test_taint(TAINT_PROPRIETARY_MODULE))
2131 printk(KERN_WARNING "%s: module license '%s' taints "
2132 "kernel.\n", mod->name, license);
2133 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2137 /* Parse tag=value strings from .modinfo section */
2138 static char *next_string(char *string, unsigned long *secsize)
2140 /* Skip non-zero chars */
2143 if ((*secsize)-- <= 1)
2147 /* Skip any zero padding. */
2148 while (!string[0]) {
2150 if ((*secsize)-- <= 1)
2156 static char *get_modinfo(struct load_info *info, const char *tag)
2159 unsigned int taglen = strlen(tag);
2160 Elf_Shdr *infosec = &info->sechdrs[info->index.info];
2161 unsigned long size = infosec->sh_size;
2163 for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
2164 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
2165 return p + taglen + 1;
2170 static void setup_modinfo(struct module *mod, struct load_info *info)
2172 struct module_attribute *attr;
2175 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2177 attr->setup(mod, get_modinfo(info, attr->attr.name));
2181 static void free_modinfo(struct module *mod)
2183 struct module_attribute *attr;
2186 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2192 #ifdef CONFIG_KALLSYMS
2194 /* lookup symbol in given range of kernel_symbols */
2195 static const struct kernel_symbol *lookup_symbol(const char *name,
2196 const struct kernel_symbol *start,
2197 const struct kernel_symbol *stop)
2199 return bsearch(name, start, stop - start,
2200 sizeof(struct kernel_symbol), cmp_name);
2203 static int is_exported(const char *name, unsigned long value,
2204 const struct module *mod)
2206 const struct kernel_symbol *ks;
2208 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
2210 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
2211 return ks != NULL && ks->value == value;
2215 static char elf_type(const Elf_Sym *sym, const struct load_info *info)
2217 const Elf_Shdr *sechdrs = info->sechdrs;
2219 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
2220 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
2225 if (sym->st_shndx == SHN_UNDEF)
2227 if (sym->st_shndx == SHN_ABS)
2229 if (sym->st_shndx >= SHN_LORESERVE)
2231 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
2233 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
2234 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
2235 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
2237 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2242 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
2243 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2248 if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
2255 static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
2258 const Elf_Shdr *sec;
2260 if (src->st_shndx == SHN_UNDEF
2261 || src->st_shndx >= shnum
2265 sec = sechdrs + src->st_shndx;
2266 if (!(sec->sh_flags & SHF_ALLOC)
2267 #ifndef CONFIG_KALLSYMS_ALL
2268 || !(sec->sh_flags & SHF_EXECINSTR)
2270 || (sec->sh_entsize & INIT_OFFSET_MASK))
2277 * We only allocate and copy the strings needed by the parts of symtab
2278 * we keep. This is simple, but has the effect of making multiple
2279 * copies of duplicates. We could be more sophisticated, see
2280 * linux-kernel thread starting with
2281 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2283 static void layout_symtab(struct module *mod, struct load_info *info)
2285 Elf_Shdr *symsect = info->sechdrs + info->index.sym;
2286 Elf_Shdr *strsect = info->sechdrs + info->index.str;
2288 unsigned int i, nsrc, ndst, strtab_size = 0;
2290 /* Put symbol section at end of init part of module. */
2291 symsect->sh_flags |= SHF_ALLOC;
2292 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
2293 info->index.sym) | INIT_OFFSET_MASK;
2294 pr_debug("\t%s\n", info->secstrings + symsect->sh_name);
2296 src = (void *)info->hdr + symsect->sh_offset;
2297 nsrc = symsect->sh_size / sizeof(*src);
2299 /* Compute total space required for the core symbols' strtab. */
2300 for (ndst = i = 0; i < nsrc; i++) {
2302 is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) {
2303 strtab_size += strlen(&info->strtab[src[i].st_name])+1;
2308 /* Append room for core symbols at end of core part. */
2309 info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
2310 info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
2311 mod->core_size += strtab_size;
2313 /* Put string table section at end of init part of module. */
2314 strsect->sh_flags |= SHF_ALLOC;
2315 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
2316 info->index.str) | INIT_OFFSET_MASK;
2317 pr_debug("\t%s\n", info->secstrings + strsect->sh_name);
2320 static void add_kallsyms(struct module *mod, const struct load_info *info)
2322 unsigned int i, ndst;
2326 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
2328 mod->symtab = (void *)symsec->sh_addr;
2329 mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
2330 /* Make sure we get permanent strtab: don't use info->strtab. */
2331 mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
2333 /* Set types up while we still have access to sections. */
2334 for (i = 0; i < mod->num_symtab; i++)
2335 mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
2337 mod->core_symtab = dst = mod->module_core + info->symoffs;
2338 mod->core_strtab = s = mod->module_core + info->stroffs;
2340 for (ndst = i = 0; i < mod->num_symtab; i++) {
2342 is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) {
2344 dst[ndst++].st_name = s - mod->core_strtab;
2345 s += strlcpy(s, &mod->strtab[src[i].st_name],
2349 mod->core_num_syms = ndst;
2352 static inline void layout_symtab(struct module *mod, struct load_info *info)
2356 static void add_kallsyms(struct module *mod, const struct load_info *info)
2359 #endif /* CONFIG_KALLSYMS */
2361 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
2365 #ifdef CONFIG_DYNAMIC_DEBUG
2366 if (ddebug_add_module(debug, num, debug->modname))
2367 printk(KERN_ERR "dynamic debug error adding module: %s\n",
2372 static void dynamic_debug_remove(struct _ddebug *debug)
2375 ddebug_remove_module(debug->modname);
2378 void * __weak module_alloc(unsigned long size)
2380 return vmalloc_exec(size);
2383 static void *module_alloc_update_bounds(unsigned long size)
2385 void *ret = module_alloc(size);
2388 mutex_lock(&module_mutex);
2389 /* Update module bounds. */
2390 if ((unsigned long)ret < module_addr_min)
2391 module_addr_min = (unsigned long)ret;
2392 if ((unsigned long)ret + size > module_addr_max)
2393 module_addr_max = (unsigned long)ret + size;
2394 mutex_unlock(&module_mutex);
2399 #ifdef CONFIG_DEBUG_KMEMLEAK
2400 static void kmemleak_load_module(const struct module *mod,
2401 const struct load_info *info)
2405 /* only scan the sections containing data */
2406 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
2408 for (i = 1; i < info->hdr->e_shnum; i++) {
2409 const char *name = info->secstrings + info->sechdrs[i].sh_name;
2410 if (!(info->sechdrs[i].sh_flags & SHF_ALLOC))
2412 if (!strstarts(name, ".data") && !strstarts(name, ".bss"))
2415 kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
2416 info->sechdrs[i].sh_size, GFP_KERNEL);
2420 static inline void kmemleak_load_module(const struct module *mod,
2421 const struct load_info *info)
2426 #ifdef CONFIG_MODULE_SIG
2427 static int module_sig_check(struct load_info *info)
2430 const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
2431 const void *mod = info->hdr;
2433 if (info->len > markerlen &&
2434 memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) {
2435 /* We truncate the module to discard the signature */
2436 info->len -= markerlen;
2437 err = mod_verify_sig(mod, &info->len);
2441 info->sig_ok = true;
2445 /* Not having a signature is only an error if we're strict. */
2446 if (err < 0 && fips_enabled)
2447 panic("Module verification failed with error %d in FIPS mode\n",
2449 if (err == -ENOKEY && !sig_enforce)
2454 #else /* !CONFIG_MODULE_SIG */
2455 static int module_sig_check(struct load_info *info)
2459 #endif /* !CONFIG_MODULE_SIG */
2461 /* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2462 static int elf_header_check(struct load_info *info)
2464 if (info->len < sizeof(*(info->hdr)))
2467 if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0
2468 || info->hdr->e_type != ET_REL
2469 || !elf_check_arch(info->hdr)
2470 || info->hdr->e_shentsize != sizeof(Elf_Shdr))
2473 if (info->hdr->e_shoff >= info->len
2474 || (info->hdr->e_shnum * sizeof(Elf_Shdr) >
2475 info->len - info->hdr->e_shoff))
2481 /* Sets info->hdr and info->len. */
2482 static int copy_module_from_user(const void __user *umod, unsigned long len,
2483 struct load_info *info)
2488 if (info->len < sizeof(*(info->hdr)))
2491 err = security_kernel_module_from_file(NULL);
2495 /* Suck in entire file: we'll want most of it. */
2496 info->hdr = vmalloc(info->len);
2500 if (copy_from_user(info->hdr, umod, info->len) != 0) {
2508 /* Sets info->hdr and info->len. */
2509 static int copy_module_from_fd(int fd, struct load_info *info)
2521 err = security_kernel_module_from_file(file);
2525 err = vfs_getattr(file->f_vfsmnt, file->f_dentry, &stat);
2529 if (stat.size > INT_MAX) {
2533 info->hdr = vmalloc(stat.size);
2540 while (pos < stat.size) {
2541 bytes = kernel_read(file, pos, (char *)(info->hdr) + pos,
2559 static void free_copy(struct load_info *info)
2564 static int rewrite_section_headers(struct load_info *info, int flags)
2568 /* This should always be true, but let's be sure. */
2569 info->sechdrs[0].sh_addr = 0;
2571 for (i = 1; i < info->hdr->e_shnum; i++) {
2572 Elf_Shdr *shdr = &info->sechdrs[i];
2573 if (shdr->sh_type != SHT_NOBITS
2574 && info->len < shdr->sh_offset + shdr->sh_size) {
2575 printk(KERN_ERR "Module len %lu truncated\n",
2580 /* Mark all sections sh_addr with their address in the
2582 shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
2584 #ifndef CONFIG_MODULE_UNLOAD
2585 /* Don't load .exit sections */
2586 if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
2587 shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
2591 /* Track but don't keep modinfo and version sections. */
2592 if (flags & MODULE_INIT_IGNORE_MODVERSIONS)
2593 info->index.vers = 0; /* Pretend no __versions section! */
2595 info->index.vers = find_sec(info, "__versions");
2596 info->index.info = find_sec(info, ".modinfo");
2597 info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
2598 info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
2603 * Set up our basic convenience variables (pointers to section headers,
2604 * search for module section index etc), and do some basic section
2607 * Return the temporary module pointer (we'll replace it with the final
2608 * one when we move the module sections around).
2610 static struct module *setup_load_info(struct load_info *info, int flags)
2616 /* Set up the convenience variables */
2617 info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
2618 info->secstrings = (void *)info->hdr
2619 + info->sechdrs[info->hdr->e_shstrndx].sh_offset;
2621 err = rewrite_section_headers(info, flags);
2623 return ERR_PTR(err);
2625 /* Find internal symbols and strings. */
2626 for (i = 1; i < info->hdr->e_shnum; i++) {
2627 if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
2628 info->index.sym = i;
2629 info->index.str = info->sechdrs[i].sh_link;
2630 info->strtab = (char *)info->hdr
2631 + info->sechdrs[info->index.str].sh_offset;
2636 info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
2637 if (!info->index.mod) {
2638 printk(KERN_WARNING "No module found in object\n");
2639 return ERR_PTR(-ENOEXEC);
2641 /* This is temporary: point mod into copy of data. */
2642 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2644 if (info->index.sym == 0) {
2645 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
2647 return ERR_PTR(-ENOEXEC);
2650 info->index.pcpu = find_pcpusec(info);
2652 /* Check module struct version now, before we try to use module. */
2653 if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
2654 return ERR_PTR(-ENOEXEC);
2659 static int check_modinfo(struct module *mod, struct load_info *info, int flags)
2661 const char *modmagic = get_modinfo(info, "vermagic");
2664 if (flags & MODULE_INIT_IGNORE_VERMAGIC)
2667 /* This is allowed: modprobe --force will invalidate it. */
2669 err = try_to_force_load(mod, "bad vermagic");
2672 } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
2673 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
2674 mod->name, modmagic, vermagic);
2678 if (!get_modinfo(info, "intree"))
2679 add_taint_module(mod, TAINT_OOT_MODULE);
2681 if (get_modinfo(info, "staging")) {
2682 add_taint_module(mod, TAINT_CRAP);
2683 printk(KERN_WARNING "%s: module is from the staging directory,"
2684 " the quality is unknown, you have been warned.\n",
2688 /* Set up license info based on the info section */
2689 set_license(mod, get_modinfo(info, "license"));
2694 static void find_module_sections(struct module *mod, struct load_info *info)
2696 mod->kp = section_objs(info, "__param",
2697 sizeof(*mod->kp), &mod->num_kp);
2698 mod->syms = section_objs(info, "__ksymtab",
2699 sizeof(*mod->syms), &mod->num_syms);
2700 mod->crcs = section_addr(info, "__kcrctab");
2701 mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
2702 sizeof(*mod->gpl_syms),
2703 &mod->num_gpl_syms);
2704 mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
2705 mod->gpl_future_syms = section_objs(info,
2706 "__ksymtab_gpl_future",
2707 sizeof(*mod->gpl_future_syms),
2708 &mod->num_gpl_future_syms);
2709 mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
2711 #ifdef CONFIG_UNUSED_SYMBOLS
2712 mod->unused_syms = section_objs(info, "__ksymtab_unused",
2713 sizeof(*mod->unused_syms),
2714 &mod->num_unused_syms);
2715 mod->unused_crcs = section_addr(info, "__kcrctab_unused");
2716 mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
2717 sizeof(*mod->unused_gpl_syms),
2718 &mod->num_unused_gpl_syms);
2719 mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
2721 #ifdef CONFIG_CONSTRUCTORS
2722 mod->ctors = section_objs(info, ".ctors",
2723 sizeof(*mod->ctors), &mod->num_ctors);
2726 #ifdef CONFIG_TRACEPOINTS
2727 mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
2728 sizeof(*mod->tracepoints_ptrs),
2729 &mod->num_tracepoints);
2731 #ifdef HAVE_JUMP_LABEL
2732 mod->jump_entries = section_objs(info, "__jump_table",
2733 sizeof(*mod->jump_entries),
2734 &mod->num_jump_entries);
2736 #ifdef CONFIG_EVENT_TRACING
2737 mod->trace_events = section_objs(info, "_ftrace_events",
2738 sizeof(*mod->trace_events),
2739 &mod->num_trace_events);
2741 * This section contains pointers to allocated objects in the trace
2742 * code and not scanning it leads to false positives.
2744 kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
2745 mod->num_trace_events, GFP_KERNEL);
2747 #ifdef CONFIG_TRACING
2748 mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt",
2749 sizeof(*mod->trace_bprintk_fmt_start),
2750 &mod->num_trace_bprintk_fmt);
2752 * This section contains pointers to allocated objects in the trace
2753 * code and not scanning it leads to false positives.
2755 kmemleak_scan_area(mod->trace_bprintk_fmt_start,
2756 sizeof(*mod->trace_bprintk_fmt_start) *
2757 mod->num_trace_bprintk_fmt, GFP_KERNEL);
2759 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
2760 /* sechdrs[0].sh_size is always zero */
2761 mod->ftrace_callsites = section_objs(info, "__mcount_loc",
2762 sizeof(*mod->ftrace_callsites),
2763 &mod->num_ftrace_callsites);
2766 mod->extable = section_objs(info, "__ex_table",
2767 sizeof(*mod->extable), &mod->num_exentries);
2769 if (section_addr(info, "__obsparm"))
2770 printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
2773 info->debug = section_objs(info, "__verbose",
2774 sizeof(*info->debug), &info->num_debug);
2777 static int move_module(struct module *mod, struct load_info *info)
2782 /* Do the allocs. */
2783 ptr = module_alloc_update_bounds(mod->core_size);
2785 * The pointer to this block is stored in the module structure
2786 * which is inside the block. Just mark it as not being a
2789 kmemleak_not_leak(ptr);
2793 memset(ptr, 0, mod->core_size);
2794 mod->module_core = ptr;
2796 if (mod->init_size) {
2797 ptr = module_alloc_update_bounds(mod->init_size);
2799 * The pointer to this block is stored in the module structure
2800 * which is inside the block. This block doesn't need to be
2801 * scanned as it contains data and code that will be freed
2802 * after the module is initialized.
2804 kmemleak_ignore(ptr);
2806 module_free(mod, mod->module_core);
2809 memset(ptr, 0, mod->init_size);
2810 mod->module_init = ptr;
2812 mod->module_init = NULL;
2814 /* Transfer each section which specifies SHF_ALLOC */
2815 pr_debug("final section addresses:\n");
2816 for (i = 0; i < info->hdr->e_shnum; i++) {
2818 Elf_Shdr *shdr = &info->sechdrs[i];
2820 if (!(shdr->sh_flags & SHF_ALLOC))
2823 if (shdr->sh_entsize & INIT_OFFSET_MASK)
2824 dest = mod->module_init
2825 + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
2827 dest = mod->module_core + shdr->sh_entsize;
2829 if (shdr->sh_type != SHT_NOBITS)
2830 memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
2831 /* Update sh_addr to point to copy in image. */
2832 shdr->sh_addr = (unsigned long)dest;
2833 pr_debug("\t0x%lx %s\n",
2834 (long)shdr->sh_addr, info->secstrings + shdr->sh_name);
2840 static int check_module_license_and_versions(struct module *mod)
2843 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2844 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2845 * using GPL-only symbols it needs.
2847 if (strcmp(mod->name, "ndiswrapper") == 0)
2848 add_taint(TAINT_PROPRIETARY_MODULE);
2850 /* driverloader was caught wrongly pretending to be under GPL */
2851 if (strcmp(mod->name, "driverloader") == 0)
2852 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2854 /* lve claims to be GPL but upstream won't provide source */
2855 if (strcmp(mod->name, "lve") == 0)
2856 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
2858 #ifdef CONFIG_MODVERSIONS
2859 if ((mod->num_syms && !mod->crcs)
2860 || (mod->num_gpl_syms && !mod->gpl_crcs)
2861 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2862 #ifdef CONFIG_UNUSED_SYMBOLS
2863 || (mod->num_unused_syms && !mod->unused_crcs)
2864 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2867 return try_to_force_load(mod,
2868 "no versions for exported symbols");
2874 static void flush_module_icache(const struct module *mod)
2876 mm_segment_t old_fs;
2878 /* flush the icache in correct context */
2883 * Flush the instruction cache, since we've played with text.
2884 * Do it before processing of module parameters, so the module
2885 * can provide parameter accessor functions of its own.
2887 if (mod->module_init)
2888 flush_icache_range((unsigned long)mod->module_init,
2889 (unsigned long)mod->module_init
2891 flush_icache_range((unsigned long)mod->module_core,
2892 (unsigned long)mod->module_core + mod->core_size);
2897 int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
2905 static struct module *layout_and_allocate(struct load_info *info, int flags)
2907 /* Module within temporary copy. */
2912 mod = setup_load_info(info, flags);
2916 err = check_modinfo(mod, info, flags);
2918 return ERR_PTR(err);
2920 /* Allow arches to frob section contents and sizes. */
2921 err = module_frob_arch_sections(info->hdr, info->sechdrs,
2922 info->secstrings, mod);
2926 pcpusec = &info->sechdrs[info->index.pcpu];
2927 if (pcpusec->sh_size) {
2928 /* We have a special allocation for this section. */
2929 err = percpu_modalloc(mod,
2930 pcpusec->sh_size, pcpusec->sh_addralign);
2933 pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC;
2936 /* Determine total sizes, and put offsets in sh_entsize. For now
2937 this is done generically; there doesn't appear to be any
2938 special cases for the architectures. */
2939 layout_sections(mod, info);
2940 layout_symtab(mod, info);
2942 /* Allocate and move to the final place */
2943 err = move_module(mod, info);
2947 /* Module has been copied to its final place now: return it. */
2948 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2949 kmemleak_load_module(mod, info);
2953 percpu_modfree(mod);
2955 return ERR_PTR(err);
2958 /* mod is no longer valid after this! */
2959 static void module_deallocate(struct module *mod, struct load_info *info)
2961 percpu_modfree(mod);
2962 module_free(mod, mod->module_init);
2963 module_free(mod, mod->module_core);
2966 int __weak module_finalize(const Elf_Ehdr *hdr,
2967 const Elf_Shdr *sechdrs,
2973 static int post_relocation(struct module *mod, const struct load_info *info)
2975 /* Sort exception table now relocations are done. */
2976 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2978 /* Copy relocated percpu area over. */
2979 percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
2980 info->sechdrs[info->index.pcpu].sh_size);
2982 /* Setup kallsyms-specific fields. */
2983 add_kallsyms(mod, info);
2985 /* Arch-specific module finalizing. */
2986 return module_finalize(info->hdr, info->sechdrs, mod);
2989 /* Is this module of this name done loading? No locks held. */
2990 static bool finished_loading(const char *name)
2995 mutex_lock(&module_mutex);
2996 mod = find_module(name);
2997 ret = !mod || mod->state != MODULE_STATE_COMING;
2998 mutex_unlock(&module_mutex);
3003 /* Call module constructors. */
3004 static void do_mod_ctors(struct module *mod)
3006 #ifdef CONFIG_CONSTRUCTORS
3009 for (i = 0; i < mod->num_ctors; i++)
3014 /* This is where the real work happens */
3015 static int do_init_module(struct module *mod)
3019 blocking_notifier_call_chain(&module_notify_list,
3020 MODULE_STATE_COMING, mod);
3022 /* Set RO and NX regions for core */
3023 set_section_ro_nx(mod->module_core,
3024 mod->core_text_size,
3028 /* Set RO and NX regions for init */
3029 set_section_ro_nx(mod->module_init,
3030 mod->init_text_size,
3035 /* Start the module */
3036 if (mod->init != NULL)
3037 ret = do_one_initcall(mod->init);
3039 /* Init routine failed: abort. Try to protect us from
3040 buggy refcounters. */
3041 mod->state = MODULE_STATE_GOING;
3042 synchronize_sched();
3044 blocking_notifier_call_chain(&module_notify_list,
3045 MODULE_STATE_GOING, mod);
3047 wake_up_all(&module_wq);
3052 "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n"
3053 "%s: loading module anyway...\n",
3054 __func__, mod->name, ret,
3059 /* Now it's a first class citizen! */
3060 mod->state = MODULE_STATE_LIVE;
3061 blocking_notifier_call_chain(&module_notify_list,
3062 MODULE_STATE_LIVE, mod);
3064 /* We need to finish all async code before the module init sequence is done */
3065 async_synchronize_full();
3067 mutex_lock(&module_mutex);
3068 /* Drop initial reference. */
3070 trim_init_extable(mod);
3071 #ifdef CONFIG_KALLSYMS
3072 mod->num_symtab = mod->core_num_syms;
3073 mod->symtab = mod->core_symtab;
3074 mod->strtab = mod->core_strtab;
3076 unset_module_init_ro_nx(mod);
3077 module_free(mod, mod->module_init);
3078 mod->module_init = NULL;
3080 mod->init_ro_size = 0;
3081 mod->init_text_size = 0;
3082 mutex_unlock(&module_mutex);
3083 wake_up_all(&module_wq);
3088 static int may_init_module(void)
3090 if (!capable(CAP_SYS_MODULE) || modules_disabled)
3096 /* Allocate and load the module: note that size of section 0 is always
3097 zero, and we rely on this for optional sections. */
3098 static int load_module(struct load_info *info, const char __user *uargs,
3101 struct module *mod, *old;
3104 err = module_sig_check(info);
3108 err = elf_header_check(info);
3112 /* Figure out module layout, and allocate all the memory. */
3113 mod = layout_and_allocate(info, flags);
3119 #ifdef CONFIG_MODULE_SIG
3120 mod->sig_ok = info->sig_ok;
3122 add_taint_module(mod, TAINT_FORCED_MODULE);
3125 /* Now module is in final location, initialize linked lists, etc. */
3126 err = module_unload_init(mod);
3130 /* Now we've got everything in the final locations, we can
3131 * find optional sections. */
3132 find_module_sections(mod, info);
3134 err = check_module_license_and_versions(mod);
3138 /* Set up MODINFO_ATTR fields */
3139 setup_modinfo(mod, info);
3141 /* Fix up syms, so that st_value is a pointer to location. */
3142 err = simplify_symbols(mod, info);
3146 err = apply_relocations(mod, info);
3150 err = post_relocation(mod, info);
3154 flush_module_icache(mod);
3156 /* Now copy in args */
3157 mod->args = strndup_user(uargs, ~0UL >> 1);
3158 if (IS_ERR(mod->args)) {
3159 err = PTR_ERR(mod->args);
3160 goto free_arch_cleanup;
3163 /* Mark state as coming so strong_try_module_get() ignores us. */
3164 mod->state = MODULE_STATE_COMING;
3166 /* Now sew it into the lists so we can get lockdep and oops
3167 * info during argument parsing. No one should access us, since
3168 * strong_try_module_get() will fail.
3169 * lockdep/oops can run asynchronous, so use the RCU list insertion
3170 * function to insert in a way safe to concurrent readers.
3171 * The mutex protects against concurrent writers.
3174 mutex_lock(&module_mutex);
3175 if ((old = find_module(mod->name)) != NULL) {
3176 if (old->state == MODULE_STATE_COMING) {
3177 /* Wait in case it fails to load. */
3178 mutex_unlock(&module_mutex);
3179 err = wait_event_interruptible(module_wq,
3180 finished_loading(mod->name));
3182 goto free_arch_cleanup;
3189 /* This has to be done once we're sure module name is unique. */
3190 dynamic_debug_setup(info->debug, info->num_debug);
3192 /* Find duplicate symbols */
3193 err = verify_export_symbols(mod);
3197 module_bug_finalize(info->hdr, info->sechdrs, mod);
3198 list_add_rcu(&mod->list, &modules);
3199 mutex_unlock(&module_mutex);
3201 /* Module is ready to execute: parsing args may do that. */
3202 err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
3203 -32768, 32767, &ddebug_dyndbg_module_param_cb);
3207 /* Link in to syfs. */
3208 err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp);
3212 /* Get rid of temporary copy. */
3216 trace_module_load(mod);
3218 return do_init_module(mod);
3221 mutex_lock(&module_mutex);
3222 /* Unlink carefully: kallsyms could be walking list. */
3223 list_del_rcu(&mod->list);
3224 module_bug_cleanup(mod);
3225 wake_up_all(&module_wq);
3227 dynamic_debug_remove(info->debug);
3229 mutex_unlock(&module_mutex);
3230 synchronize_sched();
3233 module_arch_cleanup(mod);
3237 module_unload_free(mod);
3239 module_deallocate(mod, info);
3245 SYSCALL_DEFINE3(init_module, void __user *, umod,
3246 unsigned long, len, const char __user *, uargs)
3249 struct load_info info = { };
3251 err = may_init_module();
3255 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3258 err = copy_module_from_user(umod, len, &info);
3262 return load_module(&info, uargs, 0);
3265 SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
3268 struct load_info info = { };
3270 err = may_init_module();
3274 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags);
3276 if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS
3277 |MODULE_INIT_IGNORE_VERMAGIC))
3280 err = copy_module_from_fd(fd, &info);
3284 return load_module(&info, uargs, flags);
3287 static inline int within(unsigned long addr, void *start, unsigned long size)
3289 return ((void *)addr >= start && (void *)addr < start + size);
3292 #ifdef CONFIG_KALLSYMS
3294 * This ignores the intensely annoying "mapping symbols" found
3295 * in ARM ELF files: $a, $t and $d.
3297 static inline int is_arm_mapping_symbol(const char *str)
3299 return str[0] == '$' && strchr("atd", str[1])
3300 && (str[2] == '\0' || str[2] == '.');
3303 static const char *get_ksymbol(struct module *mod,
3305 unsigned long *size,
3306 unsigned long *offset)
3308 unsigned int i, best = 0;
3309 unsigned long nextval;
3311 /* At worse, next value is at end of module */
3312 if (within_module_init(addr, mod))
3313 nextval = (unsigned long)mod->module_init+mod->init_text_size;
3315 nextval = (unsigned long)mod->module_core+mod->core_text_size;
3317 /* Scan for closest preceding symbol, and next symbol. (ELF
3318 starts real symbols at 1). */
3319 for (i = 1; i < mod->num_symtab; i++) {
3320 if (mod->symtab[i].st_shndx == SHN_UNDEF)
3323 /* We ignore unnamed symbols: they're uninformative
3324 * and inserted at a whim. */
3325 if (mod->symtab[i].st_value <= addr
3326 && mod->symtab[i].st_value > mod->symtab[best].st_value
3327 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3328 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3330 if (mod->symtab[i].st_value > addr
3331 && mod->symtab[i].st_value < nextval
3332 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3333 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3334 nextval = mod->symtab[i].st_value;
3341 *size = nextval - mod->symtab[best].st_value;
3343 *offset = addr - mod->symtab[best].st_value;
3344 return mod->strtab + mod->symtab[best].st_name;
3347 /* For kallsyms to ask for address resolution. NULL means not found. Careful
3348 * not to lock to avoid deadlock on oopses, simply disable preemption. */
3349 const char *module_address_lookup(unsigned long addr,
3350 unsigned long *size,
3351 unsigned long *offset,
3356 const char *ret = NULL;
3359 list_for_each_entry_rcu(mod, &modules, list) {
3360 if (within_module_init(addr, mod) ||
3361 within_module_core(addr, mod)) {
3363 *modname = mod->name;
3364 ret = get_ksymbol(mod, addr, size, offset);
3368 /* Make a copy in here where it's safe */
3370 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
3377 int lookup_module_symbol_name(unsigned long addr, char *symname)
3382 list_for_each_entry_rcu(mod, &modules, list) {
3383 if (within_module_init(addr, mod) ||
3384 within_module_core(addr, mod)) {
3387 sym = get_ksymbol(mod, addr, NULL, NULL);
3390 strlcpy(symname, sym, KSYM_NAME_LEN);
3400 int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
3401 unsigned long *offset, char *modname, char *name)
3406 list_for_each_entry_rcu(mod, &modules, list) {
3407 if (within_module_init(addr, mod) ||
3408 within_module_core(addr, mod)) {
3411 sym = get_ksymbol(mod, addr, size, offset);
3415 strlcpy(modname, mod->name, MODULE_NAME_LEN);
3417 strlcpy(name, sym, KSYM_NAME_LEN);
3427 int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
3428 char *name, char *module_name, int *exported)
3433 list_for_each_entry_rcu(mod, &modules, list) {
3434 if (symnum < mod->num_symtab) {
3435 *value = mod->symtab[symnum].st_value;
3436 *type = mod->symtab[symnum].st_info;
3437 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
3439 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
3440 *exported = is_exported(name, *value, mod);
3444 symnum -= mod->num_symtab;
3450 static unsigned long mod_find_symname(struct module *mod, const char *name)
3454 for (i = 0; i < mod->num_symtab; i++)
3455 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
3456 mod->symtab[i].st_info != 'U')
3457 return mod->symtab[i].st_value;
3461 /* Look for this name: can be of form module:name. */
3462 unsigned long module_kallsyms_lookup_name(const char *name)
3466 unsigned long ret = 0;
3468 /* Don't lock: we're in enough trouble already. */
3470 if ((colon = strchr(name, ':')) != NULL) {
3472 if ((mod = find_module(name)) != NULL)
3473 ret = mod_find_symname(mod, colon+1);
3476 list_for_each_entry_rcu(mod, &modules, list)
3477 if ((ret = mod_find_symname(mod, name)) != 0)
3484 int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
3485 struct module *, unsigned long),
3492 list_for_each_entry(mod, &modules, list) {
3493 for (i = 0; i < mod->num_symtab; i++) {
3494 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
3495 mod, mod->symtab[i].st_value);
3502 #endif /* CONFIG_KALLSYMS */
3504 static char *module_flags(struct module *mod, char *buf)
3509 mod->state == MODULE_STATE_GOING ||
3510 mod->state == MODULE_STATE_COMING) {
3512 bx += module_flags_taint(mod, buf + bx);
3513 /* Show a - for module-is-being-unloaded */
3514 if (mod->state == MODULE_STATE_GOING)
3516 /* Show a + for module-is-being-loaded */
3517 if (mod->state == MODULE_STATE_COMING)
3526 #ifdef CONFIG_PROC_FS
3527 /* Called by the /proc file system to return a list of modules. */
3528 static void *m_start(struct seq_file *m, loff_t *pos)
3530 mutex_lock(&module_mutex);
3531 return seq_list_start(&modules, *pos);
3534 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
3536 return seq_list_next(p, &modules, pos);
3539 static void m_stop(struct seq_file *m, void *p)
3541 mutex_unlock(&module_mutex);
3544 static int m_show(struct seq_file *m, void *p)
3546 struct module *mod = list_entry(p, struct module, list);
3549 seq_printf(m, "%s %u",
3550 mod->name, mod->init_size + mod->core_size);
3551 print_unload_info(m, mod);
3553 /* Informative for users. */
3554 seq_printf(m, " %s",
3555 mod->state == MODULE_STATE_GOING ? "Unloading":
3556 mod->state == MODULE_STATE_COMING ? "Loading":
3558 /* Used by oprofile and other similar tools. */
3559 seq_printf(m, " 0x%pK", mod->module_core);
3563 seq_printf(m, " %s", module_flags(mod, buf));
3565 seq_printf(m, "\n");
3569 /* Format: modulename size refcount deps address
3571 Where refcount is a number or -, and deps is a comma-separated list
3574 static const struct seq_operations modules_op = {
3581 static int modules_open(struct inode *inode, struct file *file)
3583 return seq_open(file, &modules_op);
3586 static const struct file_operations proc_modules_operations = {
3587 .open = modules_open,
3589 .llseek = seq_lseek,
3590 .release = seq_release,
3593 static int __init proc_modules_init(void)
3595 proc_create("modules", 0, NULL, &proc_modules_operations);
3598 module_init(proc_modules_init);
3601 /* Given an address, look for it in the module exception tables. */
3602 const struct exception_table_entry *search_module_extables(unsigned long addr)
3604 const struct exception_table_entry *e = NULL;
3608 list_for_each_entry_rcu(mod, &modules, list) {
3609 if (mod->num_exentries == 0)
3612 e = search_extable(mod->extable,
3613 mod->extable + mod->num_exentries - 1,
3620 /* Now, if we found one, we are running inside it now, hence
3621 we cannot unload the module, hence no refcnt needed. */
3626 * is_module_address - is this address inside a module?
3627 * @addr: the address to check.
3629 * See is_module_text_address() if you simply want to see if the address
3630 * is code (not data).
3632 bool is_module_address(unsigned long addr)
3637 ret = __module_address(addr) != NULL;
3644 * __module_address - get the module which contains an address.
3645 * @addr: the address.
3647 * Must be called with preempt disabled or module mutex held so that
3648 * module doesn't get freed during this.
3650 struct module *__module_address(unsigned long addr)
3654 if (addr < module_addr_min || addr > module_addr_max)
3657 list_for_each_entry_rcu(mod, &modules, list)
3658 if (within_module_core(addr, mod)
3659 || within_module_init(addr, mod))
3663 EXPORT_SYMBOL_GPL(__module_address);
3666 * is_module_text_address - is this address inside module code?
3667 * @addr: the address to check.
3669 * See is_module_address() if you simply want to see if the address is
3670 * anywhere in a module. See kernel_text_address() for testing if an
3671 * address corresponds to kernel or module code.
3673 bool is_module_text_address(unsigned long addr)
3678 ret = __module_text_address(addr) != NULL;
3685 * __module_text_address - get the module whose code contains an address.
3686 * @addr: the address.
3688 * Must be called with preempt disabled or module mutex held so that
3689 * module doesn't get freed during this.
3691 struct module *__module_text_address(unsigned long addr)
3693 struct module *mod = __module_address(addr);
3695 /* Make sure it's within the text section. */
3696 if (!within(addr, mod->module_init, mod->init_text_size)
3697 && !within(addr, mod->module_core, mod->core_text_size))
3702 EXPORT_SYMBOL_GPL(__module_text_address);
3704 /* Don't grab lock, we're oopsing. */
3705 void print_modules(void)
3710 printk(KERN_DEFAULT "Modules linked in:");
3711 /* Most callers should already have preempt disabled, but make sure */
3713 list_for_each_entry_rcu(mod, &modules, list)
3714 printk(" %s%s", mod->name, module_flags(mod, buf));
3716 if (last_unloaded_module[0])
3717 printk(" [last unloaded: %s]", last_unloaded_module);
3721 #ifdef CONFIG_MODVERSIONS
3722 /* Generate the signature for all relevant module structures here.
3723 * If these change, we don't want to try to parse the module. */
3724 void module_layout(struct module *mod,
3725 struct modversion_info *ver,
3726 struct kernel_param *kp,
3727 struct kernel_symbol *ks,
3728 struct tracepoint * const *tp)
3731 EXPORT_SYMBOL(module_layout);