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kernel/module.c
82.9 KB
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/* |
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Copyright (C) 2002 Richard Henderson |
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Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
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This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ |
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#include <linux/module.h> #include <linux/moduleloader.h> |
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#include <linux/ftrace_event.h> |
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#include <linux/init.h> |
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#include <linux/kallsyms.h> |
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#include <linux/fs.h> |
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#include <linux/sysfs.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/elf.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> #include <linux/syscalls.h> #include <linux/fcntl.h> #include <linux/rcupdate.h> |
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#include <linux/capability.h> |
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#include <linux/cpu.h> #include <linux/moduleparam.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/vermagic.h> #include <linux/notifier.h> |
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#include <linux/sched.h> |
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#include <linux/stop_machine.h> #include <linux/device.h> |
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#include <linux/string.h> |
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#include <linux/mutex.h> |
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#include <linux/rculist.h> |
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#include <asm/uaccess.h> |
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#include <asm/cacheflush.h> |
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#include <asm/mmu_context.h> |
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#include <linux/license.h> |
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#include <asm/sections.h> |
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#include <linux/tracepoint.h> |
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#include <linux/ftrace.h> |
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#include <linux/async.h> |
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#include <linux/percpu.h> |
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#include <linux/kmemleak.h> |
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#include <linux/jump_label.h> |
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#define CREATE_TRACE_POINTS #include <trace/events/module.h> |
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#if 0 #define DEBUGP printk #else #define DEBUGP(fmt , a...) #endif #ifndef ARCH_SHF_SMALL #define ARCH_SHF_SMALL 0 #endif /* If this is set, the section belongs in the init part of the module */ #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) |
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/* * Mutex protects: * 1) List of modules (also safely readable with preempt_disable), * 2) module_use links, * 3) module_addr_min/module_addr_max. |
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* (delete uses stop_machine/add uses RCU list operations). */ |
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DEFINE_MUTEX(module_mutex); EXPORT_SYMBOL_GPL(module_mutex); |
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static LIST_HEAD(modules); |
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#ifdef CONFIG_KGDB_KDB struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ #endif /* CONFIG_KGDB_KDB */ |
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/* Block module loading/unloading? */ int modules_disabled = 0; |
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/* Waiting for a module to finish initializing? */ static DECLARE_WAIT_QUEUE_HEAD(module_wq); |
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static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
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/* Bounds of module allocation, for speeding __module_address. * Protected by module_mutex. */ |
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static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
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int register_module_notifier(struct notifier_block * nb) { |
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return blocking_notifier_chain_register(&module_notify_list, nb); |
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} EXPORT_SYMBOL(register_module_notifier); int unregister_module_notifier(struct notifier_block * nb) { |
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return blocking_notifier_chain_unregister(&module_notify_list, nb); |
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} EXPORT_SYMBOL(unregister_module_notifier); |
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struct load_info { Elf_Ehdr *hdr; unsigned long len; Elf_Shdr *sechdrs; |
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char *secstrings, *strtab; |
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unsigned long *strmap; unsigned long symoffs, stroffs; |
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struct _ddebug *debug; unsigned int num_debug; |
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struct { unsigned int sym, str, mod, vers, info, pcpu; } index; }; |
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/* We require a truly strong try_module_get(): 0 means failure due to ongoing or failed initialization etc. */ |
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static inline int strong_try_module_get(struct module *mod) { if (mod && mod->state == MODULE_STATE_COMING) |
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return -EBUSY; if (try_module_get(mod)) |
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return 0; |
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else return -ENOENT; |
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} |
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static inline void add_taint_module(struct module *mod, unsigned flag) { add_taint(flag); |
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mod->taints |= (1U << flag); |
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} |
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/* * A thread that wants to hold a reference to a module only while it * is running can call this to safely exit. nfsd and lockd use this. |
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*/ void __module_put_and_exit(struct module *mod, long code) { module_put(mod); do_exit(code); } EXPORT_SYMBOL(__module_put_and_exit); |
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/* Find a module section: 0 means not found. */ |
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static unsigned int find_sec(const struct load_info *info, const char *name) |
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{ unsigned int i; |
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for (i = 1; i < info->hdr->e_shnum; i++) { Elf_Shdr *shdr = &info->sechdrs[i]; |
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/* Alloc bit cleared means "ignore it." */ |
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if ((shdr->sh_flags & SHF_ALLOC) && strcmp(info->secstrings + shdr->sh_name, name) == 0) |
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return i; |
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} |
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return 0; } |
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/* Find a module section, or NULL. */ |
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static void *section_addr(const struct load_info *info, const char *name) |
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{ /* Section 0 has sh_addr 0. */ |
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return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
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} /* Find a module section, or NULL. Fill in number of "objects" in section. */ |
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static void *section_objs(const struct load_info *info, |
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const char *name, size_t object_size, unsigned int *num) { |
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unsigned int sec = find_sec(info, name); |
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/* Section 0 has sh_addr 0 and sh_size 0. */ |
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*num = info->sechdrs[sec].sh_size / object_size; return (void *)info->sechdrs[sec].sh_addr; |
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} |
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/* Provided by the linker */ extern const struct kernel_symbol __start___ksymtab[]; extern const struct kernel_symbol __stop___ksymtab[]; extern const struct kernel_symbol __start___ksymtab_gpl[]; extern const struct kernel_symbol __stop___ksymtab_gpl[]; |
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extern const struct kernel_symbol __start___ksymtab_gpl_future[]; extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
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extern const unsigned long __start___kcrctab[]; extern const unsigned long __start___kcrctab_gpl[]; |
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extern const unsigned long __start___kcrctab_gpl_future[]; |
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#ifdef CONFIG_UNUSED_SYMBOLS extern const struct kernel_symbol __start___ksymtab_unused[]; extern const struct kernel_symbol __stop___ksymtab_unused[]; extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; |
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extern const unsigned long __start___kcrctab_unused[]; extern const unsigned long __start___kcrctab_unused_gpl[]; |
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#endif |
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#ifndef CONFIG_MODVERSIONS #define symversion(base, idx) NULL #else |
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#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
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#endif |
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static bool each_symbol_in_section(const struct symsearch *arr, unsigned int arrsize, struct module *owner, bool (*fn)(const struct symsearch *syms, struct module *owner, unsigned int symnum, void *data), void *data) |
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{ |
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unsigned int i, j; |
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for (j = 0; j < arrsize; j++) { for (i = 0; i < arr[j].stop - arr[j].start; i++) if (fn(&arr[j], owner, i, data)) return true; |
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} |
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return false; |
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} |
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/* Returns true as soon as fn returns true, otherwise false. */ |
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bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner, unsigned int symnum, void *data), void *data) |
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{ struct module *mod; |
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static const struct symsearch arr[] = { |
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{ __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
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NOT_GPL_ONLY, false }, |
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{ __start___ksymtab_gpl, __stop___ksymtab_gpl, |
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__start___kcrctab_gpl, GPL_ONLY, false }, |
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{ __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
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__start___kcrctab_gpl_future, WILL_BE_GPL_ONLY, false }, |
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#ifdef CONFIG_UNUSED_SYMBOLS |
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{ __start___ksymtab_unused, __stop___ksymtab_unused, |
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__start___kcrctab_unused, NOT_GPL_ONLY, true }, |
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{ __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
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__start___kcrctab_unused_gpl, GPL_ONLY, true }, |
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#endif |
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}; |
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if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) return true; |
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list_for_each_entry_rcu(mod, &modules, list) { |
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struct symsearch arr[] = { { mod->syms, mod->syms + mod->num_syms, mod->crcs, |
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NOT_GPL_ONLY, false }, |
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{ mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
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mod->gpl_crcs, GPL_ONLY, false }, |
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{ mod->gpl_future_syms, mod->gpl_future_syms + mod->num_gpl_future_syms, |
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mod->gpl_future_crcs, WILL_BE_GPL_ONLY, false }, |
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#ifdef CONFIG_UNUSED_SYMBOLS |
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{ mod->unused_syms, mod->unused_syms + mod->num_unused_syms, |
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mod->unused_crcs, NOT_GPL_ONLY, true }, |
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{ mod->unused_gpl_syms, mod->unused_gpl_syms + mod->num_unused_gpl_syms, |
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mod->unused_gpl_crcs, GPL_ONLY, true }, |
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#endif |
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}; |
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if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) return true; } return false; } |
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EXPORT_SYMBOL_GPL(each_symbol); |
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struct find_symbol_arg { /* Input */ const char *name; bool gplok; bool warn; /* Output */ struct module *owner; const unsigned long *crc; |
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const struct kernel_symbol *sym; |
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}; static bool find_symbol_in_section(const struct symsearch *syms, struct module *owner, unsigned int symnum, void *data) { struct find_symbol_arg *fsa = data; if (strcmp(syms->start[symnum].name, fsa->name) != 0) return false; if (!fsa->gplok) { if (syms->licence == GPL_ONLY) return false; if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { printk(KERN_WARNING "Symbol %s is being used " "by a non-GPL module, which will not " "be allowed in the future ", fsa->name); printk(KERN_WARNING "Please see the file " "Documentation/feature-removal-schedule.txt " "in the kernel source tree for more details. "); |
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} |
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} |
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#ifdef CONFIG_UNUSED_SYMBOLS |
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if (syms->unused && fsa->warn) { printk(KERN_WARNING "Symbol %s is marked as UNUSED, " "however this module is using it. ", fsa->name); printk(KERN_WARNING "This symbol will go away in the future. "); printk(KERN_WARNING "Please evalute if this is the right api to use and if " "it really is, submit a report the linux kernel " "mailinglist together with submitting your code for " "inclusion. "); } |
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#endif |
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fsa->owner = owner; fsa->crc = symversion(syms->crcs, symnum); |
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fsa->sym = &syms->start[symnum]; |
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return true; } |
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/* Find a symbol and return it, along with, (optional) crc and |
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* (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
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const struct kernel_symbol *find_symbol(const char *name, struct module **owner, const unsigned long **crc, bool gplok, bool warn) |
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{ struct find_symbol_arg fsa; fsa.name = name; fsa.gplok = gplok; fsa.warn = warn; if (each_symbol(find_symbol_in_section, &fsa)) { if (owner) *owner = fsa.owner; if (crc) *crc = fsa.crc; |
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return fsa.sym; |
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} |
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DEBUGP("Failed to find symbol %s ", name); |
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return NULL; |
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} |
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EXPORT_SYMBOL_GPL(find_symbol); |
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/* Search for module by name: must hold module_mutex. */ |
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struct module *find_module(const char *name) |
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{ struct module *mod; list_for_each_entry(mod, &modules, list) { if (strcmp(mod->name, name) == 0) return mod; } return NULL; } |
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EXPORT_SYMBOL_GPL(find_module); |
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#ifdef CONFIG_SMP |
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static inline void __percpu *mod_percpu(struct module *mod) |
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{ |
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return mod->percpu; } |
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static int percpu_modalloc(struct module *mod, unsigned long size, unsigned long align) { |
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if (align > PAGE_SIZE) { printk(KERN_WARNING "%s: per-cpu alignment %li > %li ", |
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mod->name, align, PAGE_SIZE); |
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align = PAGE_SIZE; } |
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mod->percpu = __alloc_reserved_percpu(size, align); if (!mod->percpu) { |
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printk(KERN_WARNING |
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"%s: Could not allocate %lu bytes percpu data ", mod->name, size); |
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return -ENOMEM; } mod->percpu_size = size; return 0; |
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} |
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static void percpu_modfree(struct module *mod) |
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{ |
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free_percpu(mod->percpu); |
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} |
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static unsigned int find_pcpusec(struct load_info *info) |
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{ |
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return find_sec(info, ".data..percpu"); |
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} |
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static void percpu_modcopy(struct module *mod, const void *from, unsigned long size) |
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{ int cpu; for_each_possible_cpu(cpu) |
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memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
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} |
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/** * is_module_percpu_address - test whether address is from module static percpu * @addr: address to test * * Test whether @addr belongs to module static percpu area. * * RETURNS: * %true if @addr is from module static percpu area */ bool is_module_percpu_address(unsigned long addr) { struct module *mod; unsigned int cpu; preempt_disable(); list_for_each_entry_rcu(mod, &modules, list) { if (!mod->percpu_size) continue; for_each_possible_cpu(cpu) { void *start = per_cpu_ptr(mod->percpu, cpu); if ((void *)addr >= start && (void *)addr < start + mod->percpu_size) { preempt_enable(); return true; } } } preempt_enable(); return false; |
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} |
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#else /* ... !CONFIG_SMP */ |
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static inline void __percpu *mod_percpu(struct module *mod) |
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{ return NULL; } |
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static inline int percpu_modalloc(struct module *mod, unsigned long size, unsigned long align) { return -ENOMEM; } static inline void percpu_modfree(struct module *mod) |
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{ |
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} |
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static unsigned int find_pcpusec(struct load_info *info) |
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{ return 0; } |
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static inline void percpu_modcopy(struct module *mod, const void *from, unsigned long size) |
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{ /* pcpusec should be 0, and size of that section should be 0. */ BUG_ON(size != 0); } |
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bool is_module_percpu_address(unsigned long addr) { return false; } |
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#endif /* CONFIG_SMP */ |
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|
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 |
#define MODINFO_ATTR(field) \ static void setup_modinfo_##field(struct module *mod, const char *s) \ { \ mod->field = kstrdup(s, GFP_KERNEL); \ } \ static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ struct module *mod, char *buffer) \ { \ return sprintf(buffer, "%s ", mod->field); \ } \ static int modinfo_##field##_exists(struct module *mod) \ { \ return mod->field != NULL; \ } \ static void free_modinfo_##field(struct module *mod) \ { \ |
22a8bdeb5
|
498 499 |
kfree(mod->field); \ mod->field = NULL; \ |
c988d2b28
|
500 501 |
} \ static struct module_attribute modinfo_##field = { \ |
7b595756e
|
502 |
.attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b28
|
503 504 505 506 507 508 509 510 |
.show = show_modinfo_##field, \ .setup = setup_modinfo_##field, \ .test = modinfo_##field##_exists, \ .free = free_modinfo_##field, \ }; MODINFO_ATTR(version); MODINFO_ATTR(srcversion); |
e14af7eeb
|
511 |
static char last_unloaded_module[MODULE_NAME_LEN+1]; |
03e88ae1b
|
512 |
#ifdef CONFIG_MODULE_UNLOAD |
eb0c53771
|
513 514 |
EXPORT_TRACEPOINT_SYMBOL(module_get); |
1da177e4c
|
515 |
/* Init the unload section of the module. */ |
9f85a4bbb
|
516 |
static int module_unload_init(struct module *mod) |
1da177e4c
|
517 |
{ |
9f85a4bbb
|
518 519 520 |
mod->refptr = alloc_percpu(struct module_ref); if (!mod->refptr) return -ENOMEM; |
2c02dfe7f
|
521 522 |
INIT_LIST_HEAD(&mod->source_list); INIT_LIST_HEAD(&mod->target_list); |
e1783a240
|
523 |
|
1da177e4c
|
524 |
/* Hold reference count during initialization. */ |
5fbfb18d7
|
525 |
__this_cpu_write(mod->refptr->incs, 1); |
1da177e4c
|
526 527 |
/* Backwards compatibility macros put refcount during init. */ mod->waiter = current; |
9f85a4bbb
|
528 529 |
return 0; |
1da177e4c
|
530 |
} |
1da177e4c
|
531 532 533 534 |
/* Does a already use b? */ static int already_uses(struct module *a, struct module *b) { struct module_use *use; |
2c02dfe7f
|
535 536 |
list_for_each_entry(use, &b->source_list, source_list) { if (use->source == a) { |
1da177e4c
|
537 538 539 540 541 542 543 544 545 |
DEBUGP("%s uses %s! ", a->name, b->name); return 1; } } DEBUGP("%s does not use %s! ", a->name, b->name); return 0; } |
2c02dfe7f
|
546 547 548 549 550 551 552 553 554 |
/* * Module a uses b * - we add 'a' as a "source", 'b' as a "target" of module use * - the module_use is added to the list of 'b' sources (so * 'b' can walk the list to see who sourced them), and of 'a' * targets (so 'a' can see what modules it targets). */ static int add_module_usage(struct module *a, struct module *b) { |
2c02dfe7f
|
555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 |
struct module_use *use; DEBUGP("Allocating new usage for %s. ", a->name); use = kmalloc(sizeof(*use), GFP_ATOMIC); if (!use) { printk(KERN_WARNING "%s: out of memory loading ", a->name); return -ENOMEM; } use->source = a; use->target = b; list_add(&use->source_list, &b->source_list); list_add(&use->target_list, &a->target_list); |
2c02dfe7f
|
570 571 |
return 0; } |
75676500f
|
572 |
/* Module a uses b: caller needs module_mutex() */ |
9bea7f239
|
573 |
int ref_module(struct module *a, struct module *b) |
1da177e4c
|
574 |
{ |
c8e21ced0
|
575 |
int err; |
270a6c4ca
|
576 |
|
9bea7f239
|
577 |
if (b == NULL || already_uses(a, b)) |
218ce7351
|
578 |
return 0; |
218ce7351
|
579 |
|
9bea7f239
|
580 581 |
/* If module isn't available, we fail. */ err = strong_try_module_get(b); |
c9a3ba55b
|
582 |
if (err) |
9bea7f239
|
583 |
return err; |
1da177e4c
|
584 |
|
2c02dfe7f
|
585 586 |
err = add_module_usage(a, b); if (err) { |
1da177e4c
|
587 |
module_put(b); |
9bea7f239
|
588 |
return err; |
1da177e4c
|
589 |
} |
9bea7f239
|
590 |
return 0; |
1da177e4c
|
591 |
} |
9bea7f239
|
592 |
EXPORT_SYMBOL_GPL(ref_module); |
1da177e4c
|
593 594 595 596 |
/* Clear the unload stuff of the module. */ static void module_unload_free(struct module *mod) { |
2c02dfe7f
|
597 |
struct module_use *use, *tmp; |
1da177e4c
|
598 |
|
75676500f
|
599 |
mutex_lock(&module_mutex); |
2c02dfe7f
|
600 601 602 603 604 605 606 607 |
list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { struct module *i = use->target; DEBUGP("%s unusing %s ", mod->name, i->name); module_put(i); list_del(&use->source_list); list_del(&use->target_list); kfree(use); |
1da177e4c
|
608 |
} |
75676500f
|
609 |
mutex_unlock(&module_mutex); |
9f85a4bbb
|
610 611 |
free_percpu(mod->refptr); |
1da177e4c
|
612 613 614 |
} #ifdef CONFIG_MODULE_FORCE_UNLOAD |
fb1697933
|
615 |
static inline int try_force_unload(unsigned int flags) |
1da177e4c
|
616 617 618 |
{ int ret = (flags & O_TRUNC); if (ret) |
fb1697933
|
619 |
add_taint(TAINT_FORCED_RMMOD); |
1da177e4c
|
620 621 622 |
return ret; } #else |
fb1697933
|
623 |
static inline int try_force_unload(unsigned int flags) |
1da177e4c
|
624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 |
{ return 0; } #endif /* CONFIG_MODULE_FORCE_UNLOAD */ struct stopref { struct module *mod; int flags; int *forced; }; /* Whole machine is stopped with interrupts off when this runs. */ static int __try_stop_module(void *_sref) { struct stopref *sref = _sref; |
da39ba5e1
|
640 641 |
/* If it's not unused, quit unless we're forcing. */ if (module_refcount(sref->mod) != 0) { |
fb1697933
|
642 |
if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4c
|
643 644 645 646 647 648 649 650 651 652 |
return -EWOULDBLOCK; } /* Mark it as dying. */ sref->mod->state = MODULE_STATE_GOING; return 0; } static int try_stop_module(struct module *mod, int flags, int *forced) { |
da39ba5e1
|
653 654 |
if (flags & O_NONBLOCK) { struct stopref sref = { mod, flags, forced }; |
1da177e4c
|
655 |
|
9b1a4d383
|
656 |
return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e1
|
657 658 659 660 661 662 |
} else { /* We don't need to stop the machine for this. */ mod->state = MODULE_STATE_GOING; synchronize_sched(); return 0; } |
1da177e4c
|
663 664 665 666 |
} unsigned int module_refcount(struct module *mod) { |
5fbfb18d7
|
667 |
unsigned int incs = 0, decs = 0; |
720eba31f
|
668 |
int cpu; |
1da177e4c
|
669 |
|
720eba31f
|
670 |
for_each_possible_cpu(cpu) |
5fbfb18d7
|
671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 |
decs += per_cpu_ptr(mod->refptr, cpu)->decs; /* * ensure the incs are added up after the decs. * module_put ensures incs are visible before decs with smp_wmb. * * This 2-count scheme avoids the situation where the refcount * for CPU0 is read, then CPU0 increments the module refcount, * then CPU1 drops that refcount, then the refcount for CPU1 is * read. We would record a decrement but not its corresponding * increment so we would see a low count (disaster). * * Rare situation? But module_refcount can be preempted, and we * might be tallying up 4096+ CPUs. So it is not impossible. */ smp_rmb(); for_each_possible_cpu(cpu) incs += per_cpu_ptr(mod->refptr, cpu)->incs; return incs - decs; |
1da177e4c
|
689 690 691 692 693 694 695 696 |
} EXPORT_SYMBOL(module_refcount); /* This exists whether we can unload or not */ static void free_module(struct module *mod); static void wait_for_zero_refcount(struct module *mod) { |
a65502075
|
697 |
/* Since we might sleep for some time, release the mutex first */ |
6389a3851
|
698 |
mutex_unlock(&module_mutex); |
1da177e4c
|
699 700 701 702 703 704 705 706 707 |
for (;;) { DEBUGP("Looking at refcount... "); set_current_state(TASK_UNINTERRUPTIBLE); if (module_refcount(mod) == 0) break; schedule(); } current->state = TASK_RUNNING; |
6389a3851
|
708 |
mutex_lock(&module_mutex); |
1da177e4c
|
709 |
} |
17da2bd90
|
710 711 |
SYSCALL_DEFINE2(delete_module, const char __user *, name_user, unsigned int, flags) |
1da177e4c
|
712 713 |
{ struct module *mod; |
dfff0a067
|
714 |
char name[MODULE_NAME_LEN]; |
1da177e4c
|
715 |
int ret, forced = 0; |
3d43321b7
|
716 |
if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a067
|
717 718 719 720 721 |
return -EPERM; if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) return -EFAULT; name[MODULE_NAME_LEN-1] = '\0'; |
3fc1f1e27
|
722 723 |
if (mutex_lock_interruptible(&module_mutex) != 0) return -EINTR; |
1da177e4c
|
724 725 726 727 728 729 |
mod = find_module(name); if (!mod) { ret = -ENOENT; goto out; } |
2c02dfe7f
|
730 |
if (!list_empty(&mod->source_list)) { |
1da177e4c
|
731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 |
/* Other modules depend on us: get rid of them first. */ ret = -EWOULDBLOCK; goto out; } /* Doing init or already dying? */ if (mod->state != MODULE_STATE_LIVE) { /* FIXME: if (force), slam module count and wake up waiter --RR */ DEBUGP("%s already dying ", mod->name); ret = -EBUSY; goto out; } /* If it has an init func, it must have an exit func to unload */ |
af49d9248
|
747 |
if (mod->init && !mod->exit) { |
fb1697933
|
748 |
forced = try_force_unload(flags); |
1da177e4c
|
749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 |
if (!forced) { /* This module can't be removed */ ret = -EBUSY; goto out; } } /* Set this up before setting mod->state */ mod->waiter = current; /* Stop the machine so refcounts can't move and disable module. */ ret = try_stop_module(mod, flags, &forced); if (ret != 0) goto out; /* Never wait if forced. */ if (!forced && module_refcount(mod) != 0) wait_for_zero_refcount(mod); |
df4b565e1
|
767 |
mutex_unlock(&module_mutex); |
1da177e4c
|
768 |
/* Final destruction now noone is using it. */ |
df4b565e1
|
769 |
if (mod->exit != NULL) |
1da177e4c
|
770 |
mod->exit(); |
df4b565e1
|
771 772 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_GOING, mod); |
22a9d6456
|
773 |
async_synchronize_full(); |
75676500f
|
774 |
|
e14af7eeb
|
775 |
/* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e3
|
776 |
strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4c
|
777 |
|
75676500f
|
778 779 780 |
free_module(mod); return 0; out: |
6389a3851
|
781 |
mutex_unlock(&module_mutex); |
1da177e4c
|
782 783 |
return ret; } |
d1e99d7ae
|
784 |
static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4c
|
785 786 787 788 789 790 791 792 |
{ struct module_use *use; int printed_something = 0; seq_printf(m, " %u ", module_refcount(mod)); /* Always include a trailing , so userspace can differentiate between this and the old multi-field proc format. */ |
2c02dfe7f
|
793 |
list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4c
|
794 |
printed_something = 1; |
2c02dfe7f
|
795 |
seq_printf(m, "%s,", use->source->name); |
1da177e4c
|
796 |
} |
1da177e4c
|
797 798 799 800 801 802 803 804 805 806 807 808 |
if (mod->init != NULL && mod->exit == NULL) { printed_something = 1; seq_printf(m, "[permanent],"); } if (!printed_something) seq_printf(m, "-"); } void __symbol_put(const char *symbol) { struct module *owner; |
1da177e4c
|
809 |
|
24da1cbff
|
810 |
preempt_disable(); |
414fd31b2
|
811 |
if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4c
|
812 813 |
BUG(); module_put(owner); |
24da1cbff
|
814 |
preempt_enable(); |
1da177e4c
|
815 816 |
} EXPORT_SYMBOL(__symbol_put); |
7d1d16e41
|
817 |
/* Note this assumes addr is a function, which it currently always is. */ |
1da177e4c
|
818 819 |
void symbol_put_addr(void *addr) { |
5e3766138
|
820 |
struct module *modaddr; |
7d1d16e41
|
821 |
unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4c
|
822 |
|
7d1d16e41
|
823 |
if (core_kernel_text(a)) |
5e3766138
|
824 |
return; |
1da177e4c
|
825 |
|
a6e6abd57
|
826 827 |
/* module_text_address is safe here: we're supposed to have reference * to module from symbol_get, so it can't go away. */ |
7d1d16e41
|
828 |
modaddr = __module_text_address(a); |
a6e6abd57
|
829 |
BUG_ON(!modaddr); |
5e3766138
|
830 |
module_put(modaddr); |
1da177e4c
|
831 832 833 834 835 836 |
} EXPORT_SYMBOL_GPL(symbol_put_addr); static ssize_t show_refcnt(struct module_attribute *mattr, struct module *mod, char *buffer) { |
256e2fdf0
|
837 838 |
return sprintf(buffer, "%u ", module_refcount(mod)); |
1da177e4c
|
839 840 841 |
} static struct module_attribute refcnt = { |
7b595756e
|
842 |
.attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4c
|
843 844 |
.show = show_refcnt, }; |
f6a570333
|
845 846 847 |
void module_put(struct module *module) { if (module) { |
e1783a240
|
848 |
preempt_disable(); |
5fbfb18d7
|
849 850 |
smp_wmb(); /* see comment in module_refcount */ __this_cpu_inc(module->refptr->decs); |
e1783a240
|
851 |
|
ae832d1e0
|
852 |
trace_module_put(module, _RET_IP_); |
f6a570333
|
853 854 855 |
/* Maybe they're waiting for us to drop reference? */ if (unlikely(!module_is_live(module))) wake_up_process(module->waiter); |
e1783a240
|
856 |
preempt_enable(); |
f6a570333
|
857 858 859 |
} } EXPORT_SYMBOL(module_put); |
1da177e4c
|
860 |
#else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7ae
|
861 |
static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4c
|
862 863 864 865 866 867 868 869 |
{ /* We don't know the usage count, or what modules are using. */ seq_printf(m, " - -"); } static inline void module_unload_free(struct module *mod) { } |
9bea7f239
|
870 |
int ref_module(struct module *a, struct module *b) |
1da177e4c
|
871 |
{ |
9bea7f239
|
872 |
return strong_try_module_get(b); |
1da177e4c
|
873 |
} |
9bea7f239
|
874 |
EXPORT_SYMBOL_GPL(ref_module); |
1da177e4c
|
875 |
|
9f85a4bbb
|
876 |
static inline int module_unload_init(struct module *mod) |
1da177e4c
|
877 |
{ |
9f85a4bbb
|
878 |
return 0; |
1da177e4c
|
879 880 |
} #endif /* CONFIG_MODULE_UNLOAD */ |
1f71740ab
|
881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 |
static ssize_t show_initstate(struct module_attribute *mattr, struct module *mod, char *buffer) { const char *state = "unknown"; switch (mod->state) { case MODULE_STATE_LIVE: state = "live"; break; case MODULE_STATE_COMING: state = "coming"; break; case MODULE_STATE_GOING: state = "going"; break; } return sprintf(buffer, "%s ", state); } static struct module_attribute initstate = { |
7b595756e
|
902 |
.attr = { .name = "initstate", .mode = 0444 }, |
1f71740ab
|
903 904 |
.show = show_initstate, }; |
03e88ae1b
|
905 906 907 |
static struct module_attribute *modinfo_attrs[] = { &modinfo_version, &modinfo_srcversion, |
1f71740ab
|
908 |
&initstate, |
03e88ae1b
|
909 910 911 912 913 |
#ifdef CONFIG_MODULE_UNLOAD &refcnt, #endif NULL, }; |
1da177e4c
|
914 |
static const char vermagic[] = VERMAGIC_STRING; |
c6e665c8f
|
915 |
static int try_to_force_load(struct module *mod, const char *reason) |
826e4506a
|
916 917 |
{ #ifdef CONFIG_MODULE_FORCE_LOAD |
25ddbb18a
|
918 |
if (!test_taint(TAINT_FORCED_MODULE)) |
c6e665c8f
|
919 920 921 |
printk(KERN_WARNING "%s: %s: kernel tainted. ", mod->name, reason); |
826e4506a
|
922 923 924 925 926 927 |
add_taint_module(mod, TAINT_FORCED_MODULE); return 0; #else return -ENOEXEC; #endif } |
1da177e4c
|
928 |
#ifdef CONFIG_MODVERSIONS |
d4703aefd
|
929 930 931 932 933 934 935 936 937 938 |
/* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ static unsigned long maybe_relocated(unsigned long crc, const struct module *crc_owner) { #ifdef ARCH_RELOCATES_KCRCTAB if (crc_owner == NULL) return crc - (unsigned long)reloc_start; #endif return crc; } |
1da177e4c
|
939 940 941 942 |
static int check_version(Elf_Shdr *sechdrs, unsigned int versindex, const char *symname, struct module *mod, |
d4703aefd
|
943 944 |
const unsigned long *crc, const struct module *crc_owner) |
1da177e4c
|
945 946 947 948 949 950 951 |
{ unsigned int i, num_versions; struct modversion_info *versions; /* Exporting module didn't supply crcs? OK, we're already tainted. */ if (!crc) return 1; |
a5dd69707
|
952 953 954 |
/* No versions at all? modprobe --force does this. */ if (versindex == 0) return try_to_force_load(mod, symname) == 0; |
1da177e4c
|
955 956 957 958 959 960 961 |
versions = (void *) sechdrs[versindex].sh_addr; num_versions = sechdrs[versindex].sh_size / sizeof(struct modversion_info); for (i = 0; i < num_versions; i++) { if (strcmp(versions[i].name, symname) != 0) continue; |
d4703aefd
|
962 |
if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4c
|
963 |
return 1; |
1da177e4c
|
964 965 |
DEBUGP("Found checksum %lX vs module %lX ", |
d4703aefd
|
966 |
maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506a
|
967 |
goto bad_version; |
1da177e4c
|
968 |
} |
826e4506a
|
969 |
|
a5dd69707
|
970 971 972 973 |
printk(KERN_WARNING "%s: no symbol version for %s ", mod->name, symname); return 0; |
826e4506a
|
974 975 976 977 978 979 |
bad_version: printk("%s: disagrees about version of symbol %s ", mod->name, symname); return 0; |
1da177e4c
|
980 981 982 983 984 985 986 |
} static inline int check_modstruct_version(Elf_Shdr *sechdrs, unsigned int versindex, struct module *mod) { const unsigned long *crc; |
1da177e4c
|
987 |
|
75676500f
|
988 989 |
/* Since this should be found in kernel (which can't be removed), * no locking is necessary. */ |
6560dc160
|
990 991 |
if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL, &crc, true, false)) |
1da177e4c
|
992 |
BUG(); |
d4703aefd
|
993 994 |
return check_version(sechdrs, versindex, "module_layout", mod, crc, NULL); |
1da177e4c
|
995 |
} |
91e37a793
|
996 997 998 |
/* First part is kernel version, which we ignore if module has crcs. */ static inline int same_magic(const char *amagic, const char *bmagic, bool has_crcs) |
1da177e4c
|
999 |
{ |
91e37a793
|
1000 1001 1002 1003 |
if (has_crcs) { amagic += strcspn(amagic, " "); bmagic += strcspn(bmagic, " "); } |
1da177e4c
|
1004 1005 1006 1007 1008 1009 1010 |
return strcmp(amagic, bmagic) == 0; } #else static inline int check_version(Elf_Shdr *sechdrs, unsigned int versindex, const char *symname, struct module *mod, |
d4703aefd
|
1011 1012 |
const unsigned long *crc, const struct module *crc_owner) |
1da177e4c
|
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 |
{ return 1; } static inline int check_modstruct_version(Elf_Shdr *sechdrs, unsigned int versindex, struct module *mod) { return 1; } |
91e37a793
|
1023 1024 |
static inline int same_magic(const char *amagic, const char *bmagic, bool has_crcs) |
1da177e4c
|
1025 1026 1027 1028 |
{ return strcmp(amagic, bmagic) == 0; } #endif /* CONFIG_MODVERSIONS */ |
75676500f
|
1029 |
/* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688d
|
1030 1031 |
static const struct kernel_symbol *resolve_symbol(struct module *mod, const struct load_info *info, |
414fd31b2
|
1032 |
const char *name, |
9bea7f239
|
1033 |
char ownername[]) |
1da177e4c
|
1034 1035 |
{ struct module *owner; |
414fd31b2
|
1036 |
const struct kernel_symbol *sym; |
1da177e4c
|
1037 |
const unsigned long *crc; |
9bea7f239
|
1038 |
int err; |
1da177e4c
|
1039 |
|
75676500f
|
1040 |
mutex_lock(&module_mutex); |
414fd31b2
|
1041 |
sym = find_symbol(name, &owner, &crc, |
25ddbb18a
|
1042 |
!(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f239
|
1043 1044 |
if (!sym) goto unlock; |
49668688d
|
1045 1046 |
if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, owner)) { |
9bea7f239
|
1047 1048 |
sym = ERR_PTR(-EINVAL); goto getname; |
1da177e4c
|
1049 |
} |
9bea7f239
|
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 |
err = ref_module(mod, owner); if (err) { sym = ERR_PTR(err); goto getname; } getname: /* We must make copy under the lock if we failed to get ref. */ strncpy(ownername, module_name(owner), MODULE_NAME_LEN); unlock: |
75676500f
|
1061 |
mutex_unlock(&module_mutex); |
218ce7351
|
1062 |
return sym; |
1da177e4c
|
1063 |
} |
49668688d
|
1064 1065 1066 1067 |
static const struct kernel_symbol * resolve_symbol_wait(struct module *mod, const struct load_info *info, const char *name) |
9bea7f239
|
1068 1069 |
{ const struct kernel_symbol *ksym; |
49668688d
|
1070 |
char owner[MODULE_NAME_LEN]; |
9bea7f239
|
1071 1072 |
if (wait_event_interruptible_timeout(module_wq, |
49668688d
|
1073 1074 |
!IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) || PTR_ERR(ksym) != -EBUSY, |
9bea7f239
|
1075 1076 1077 |
30 * HZ) <= 0) { printk(KERN_WARNING "%s: gave up waiting for init of module %s. ", |
49668688d
|
1078 |
mod->name, owner); |
9bea7f239
|
1079 1080 1081 |
} return ksym; } |
1da177e4c
|
1082 1083 1084 1085 |
/* * /sys/module/foo/sections stuff * J. Corbet <corbet@lwn.net> */ |
8f6d03781
|
1086 |
#ifdef CONFIG_SYSFS |
10b465aaf
|
1087 |
|
8f6d03781
|
1088 |
#ifdef CONFIG_KALLSYMS |
10b465aaf
|
1089 1090 1091 1092 |
static inline bool sect_empty(const Elf_Shdr *sect) { return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; } |
a58730c42
|
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 |
struct module_sect_attr { struct module_attribute mattr; char *name; unsigned long address; }; struct module_sect_attrs { struct attribute_group grp; unsigned int nsections; struct module_sect_attr attrs[0]; }; |
1da177e4c
|
1106 1107 1108 1109 1110 1111 1112 1113 |
static ssize_t module_sect_show(struct module_attribute *mattr, struct module *mod, char *buf) { struct module_sect_attr *sattr = container_of(mattr, struct module_sect_attr, mattr); return sprintf(buf, "0x%lx ", sattr->address); } |
04b1db9fd
|
1114 1115 |
static void free_sect_attrs(struct module_sect_attrs *sect_attrs) { |
a58730c42
|
1116 |
unsigned int section; |
04b1db9fd
|
1117 1118 1119 1120 1121 |
for (section = 0; section < sect_attrs->nsections; section++) kfree(sect_attrs->attrs[section].name); kfree(sect_attrs); } |
8f6d03781
|
1122 |
static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4c
|
1123 1124 1125 1126 1127 |
{ unsigned int nloaded = 0, i, size[2]; struct module_sect_attrs *sect_attrs; struct module_sect_attr *sattr; struct attribute **gattr; |
22a8bdeb5
|
1128 |
|
1da177e4c
|
1129 |
/* Count loaded sections and allocate structures */ |
8f6d03781
|
1130 1131 |
for (i = 0; i < info->hdr->e_shnum; i++) if (!sect_empty(&info->sechdrs[i])) |
1da177e4c
|
1132 1133 1134 1135 1136 |
nloaded++; size[0] = ALIGN(sizeof(*sect_attrs) + nloaded * sizeof(sect_attrs->attrs[0]), sizeof(sect_attrs->grp.attrs[0])); size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); |
04b1db9fd
|
1137 1138 |
sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); if (sect_attrs == NULL) |
1da177e4c
|
1139 1140 1141 1142 1143 |
return; /* Setup section attributes. */ sect_attrs->grp.name = "sections"; sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; |
04b1db9fd
|
1144 |
sect_attrs->nsections = 0; |
1da177e4c
|
1145 1146 |
sattr = §_attrs->attrs[0]; gattr = §_attrs->grp.attrs[0]; |
8f6d03781
|
1147 1148 1149 |
for (i = 0; i < info->hdr->e_shnum; i++) { Elf_Shdr *sec = &info->sechdrs[i]; if (sect_empty(sec)) |
35dead423
|
1150 |
continue; |
8f6d03781
|
1151 1152 |
sattr->address = sec->sh_addr; sattr->name = kstrdup(info->secstrings + sec->sh_name, |
04b1db9fd
|
1153 1154 1155 1156 |
GFP_KERNEL); if (sattr->name == NULL) goto out; sect_attrs->nsections++; |
361795b1e
|
1157 |
sysfs_attr_init(&sattr->mattr.attr); |
1da177e4c
|
1158 1159 1160 |
sattr->mattr.show = module_sect_show; sattr->mattr.store = NULL; sattr->mattr.attr.name = sattr->name; |
1da177e4c
|
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 |
sattr->mattr.attr.mode = S_IRUGO; *(gattr++) = &(sattr++)->mattr.attr; } *gattr = NULL; if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) goto out; mod->sect_attrs = sect_attrs; return; out: |
04b1db9fd
|
1172 |
free_sect_attrs(sect_attrs); |
1da177e4c
|
1173 1174 1175 1176 1177 1178 1179 1180 1181 |
} static void remove_sect_attrs(struct module *mod) { if (mod->sect_attrs) { sysfs_remove_group(&mod->mkobj.kobj, &mod->sect_attrs->grp); /* We are positive that no one is using any sect attrs * at this point. Deallocate immediately. */ |
04b1db9fd
|
1182 |
free_sect_attrs(mod->sect_attrs); |
1da177e4c
|
1183 1184 1185 |
mod->sect_attrs = NULL; } } |
6d7601338
|
1186 1187 1188 1189 1190 1191 1192 1193 1194 |
/* * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. */ struct module_notes_attrs { struct kobject *dir; unsigned int notes; struct bin_attribute attrs[0]; }; |
2c3c8bea6
|
1195 |
static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d7601338
|
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 |
struct bin_attribute *bin_attr, char *buf, loff_t pos, size_t count) { /* * The caller checked the pos and count against our size. */ memcpy(buf, bin_attr->private + pos, count); return count; } static void free_notes_attrs(struct module_notes_attrs *notes_attrs, unsigned int i) { if (notes_attrs->dir) { while (i-- > 0) sysfs_remove_bin_file(notes_attrs->dir, ¬es_attrs->attrs[i]); |
e94320939
|
1213 |
kobject_put(notes_attrs->dir); |
6d7601338
|
1214 1215 1216 |
} kfree(notes_attrs); } |
8f6d03781
|
1217 |
static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d7601338
|
1218 1219 1220 1221 |
{ unsigned int notes, loaded, i; struct module_notes_attrs *notes_attrs; struct bin_attribute *nattr; |
ea6bff368
|
1222 1223 1224 |
/* failed to create section attributes, so can't create notes */ if (!mod->sect_attrs) return; |
6d7601338
|
1225 1226 |
/* Count notes sections and allocate structures. */ notes = 0; |
8f6d03781
|
1227 1228 1229 |
for (i = 0; i < info->hdr->e_shnum; i++) if (!sect_empty(&info->sechdrs[i]) && (info->sechdrs[i].sh_type == SHT_NOTE)) |
6d7601338
|
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 |
++notes; if (notes == 0) return; notes_attrs = kzalloc(sizeof(*notes_attrs) + notes * sizeof(notes_attrs->attrs[0]), GFP_KERNEL); if (notes_attrs == NULL) return; notes_attrs->notes = notes; nattr = ¬es_attrs->attrs[0]; |
8f6d03781
|
1243 1244 |
for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { if (sect_empty(&info->sechdrs[i])) |
6d7601338
|
1245 |
continue; |
8f6d03781
|
1246 |
if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1e
|
1247 |
sysfs_bin_attr_init(nattr); |
6d7601338
|
1248 1249 |
nattr->attr.name = mod->sect_attrs->attrs[loaded].name; nattr->attr.mode = S_IRUGO; |
8f6d03781
|
1250 1251 |
nattr->size = info->sechdrs[i].sh_size; nattr->private = (void *) info->sechdrs[i].sh_addr; |
6d7601338
|
1252 1253 1254 1255 1256 |
nattr->read = module_notes_read; ++nattr; } ++loaded; } |
4ff6abff8
|
1257 |
notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d7601338
|
1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 |
if (!notes_attrs->dir) goto out; for (i = 0; i < notes; ++i) if (sysfs_create_bin_file(notes_attrs->dir, ¬es_attrs->attrs[i])) goto out; mod->notes_attrs = notes_attrs; return; out: free_notes_attrs(notes_attrs, i); } static void remove_notes_attrs(struct module *mod) { if (mod->notes_attrs) free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); } |
1da177e4c
|
1278 |
#else |
04b1db9fd
|
1279 |
|
8f6d03781
|
1280 1281 |
static inline void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4c
|
1282 1283 1284 1285 1286 1287 |
{ } static inline void remove_sect_attrs(struct module *mod) { } |
6d7601338
|
1288 |
|
8f6d03781
|
1289 1290 |
static inline void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d7601338
|
1291 1292 1293 1294 1295 1296 |
{ } static inline void remove_notes_attrs(struct module *mod) { } |
8f6d03781
|
1297 |
#endif /* CONFIG_KALLSYMS */ |
1da177e4c
|
1298 |
|
80a3d1bb4
|
1299 1300 1301 1302 1303 |
static void add_usage_links(struct module *mod) { #ifdef CONFIG_MODULE_UNLOAD struct module_use *use; int nowarn; |
75676500f
|
1304 |
mutex_lock(&module_mutex); |
80a3d1bb4
|
1305 1306 1307 1308 |
list_for_each_entry(use, &mod->target_list, target_list) { nowarn = sysfs_create_link(use->target->holders_dir, &mod->mkobj.kobj, mod->name); } |
75676500f
|
1309 |
mutex_unlock(&module_mutex); |
80a3d1bb4
|
1310 1311 1312 1313 1314 1315 1316 |
#endif } static void del_usage_links(struct module *mod) { #ifdef CONFIG_MODULE_UNLOAD struct module_use *use; |
75676500f
|
1317 |
mutex_lock(&module_mutex); |
80a3d1bb4
|
1318 1319 |
list_for_each_entry(use, &mod->target_list, target_list) sysfs_remove_link(use->target->holders_dir, mod->name); |
75676500f
|
1320 |
mutex_unlock(&module_mutex); |
80a3d1bb4
|
1321 1322 |
#endif } |
6407ebb27
|
1323 |
static int module_add_modinfo_attrs(struct module *mod) |
c988d2b28
|
1324 1325 |
{ struct module_attribute *attr; |
03e88ae1b
|
1326 |
struct module_attribute *temp_attr; |
c988d2b28
|
1327 1328 |
int error = 0; int i; |
03e88ae1b
|
1329 1330 1331 1332 1333 1334 1335 |
mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * (ARRAY_SIZE(modinfo_attrs) + 1)), GFP_KERNEL); if (!mod->modinfo_attrs) return -ENOMEM; temp_attr = mod->modinfo_attrs; |
c988d2b28
|
1336 1337 |
for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { if (!attr->test || |
03e88ae1b
|
1338 1339 |
(attr->test && attr->test(mod))) { memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1e
|
1340 |
sysfs_attr_init(&temp_attr->attr); |
03e88ae1b
|
1341 1342 1343 |
error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); ++temp_attr; } |
c988d2b28
|
1344 1345 1346 |
} return error; } |
6407ebb27
|
1347 |
static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b28
|
1348 1349 1350 |
{ struct module_attribute *attr; int i; |
03e88ae1b
|
1351 1352 1353 1354 |
for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { /* pick a field to test for end of list */ if (!attr->attr.name) break; |
c988d2b28
|
1355 |
sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1b
|
1356 1357 |
if (attr->free) attr->free(mod); |
c988d2b28
|
1358 |
} |
03e88ae1b
|
1359 |
kfree(mod->modinfo_attrs); |
c988d2b28
|
1360 |
} |
1da177e4c
|
1361 |
|
6407ebb27
|
1362 |
static int mod_sysfs_init(struct module *mod) |
1da177e4c
|
1363 1364 |
{ int err; |
6494a93d5
|
1365 |
struct kobject *kobj; |
1da177e4c
|
1366 |
|
823bccfc4
|
1367 1368 1369 |
if (!module_sysfs_initialized) { printk(KERN_ERR "%s: module sysfs not initialized ", |
1cc5f7142
|
1370 1371 1372 1373 |
mod->name); err = -EINVAL; goto out; } |
6494a93d5
|
1374 1375 1376 1377 1378 1379 1380 1381 1382 |
kobj = kset_find_obj(module_kset, mod->name); if (kobj) { printk(KERN_ERR "%s: module is already loaded ", mod->name); kobject_put(kobj); err = -EINVAL; goto out; } |
1da177e4c
|
1383 |
mod->mkobj.mod = mod; |
e17e0f51a
|
1384 |
|
ac3c8141f
|
1385 1386 1387 1388 1389 1390 |
memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); mod->mkobj.kobj.kset = module_kset; err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, "%s", mod->name); if (err) kobject_put(&mod->mkobj.kobj); |
270a6c4ca
|
1391 |
|
97c146ef0
|
1392 |
/* delay uevent until full sysfs population */ |
270a6c4ca
|
1393 1394 1395 |
out: return err; } |
6407ebb27
|
1396 |
static int mod_sysfs_setup(struct module *mod, |
8f6d03781
|
1397 |
const struct load_info *info, |
270a6c4ca
|
1398 1399 1400 1401 |
struct kernel_param *kparam, unsigned int num_params) { int err; |
80a3d1bb4
|
1402 1403 1404 |
err = mod_sysfs_init(mod); if (err) goto out; |
4ff6abff8
|
1405 |
mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e18
|
1406 1407 |
if (!mod->holders_dir) { err = -ENOMEM; |
270a6c4ca
|
1408 |
goto out_unreg; |
240936e18
|
1409 |
} |
270a6c4ca
|
1410 |
|
1da177e4c
|
1411 1412 |
err = module_param_sysfs_setup(mod, kparam, num_params); if (err) |
270a6c4ca
|
1413 |
goto out_unreg_holders; |
1da177e4c
|
1414 |
|
c988d2b28
|
1415 1416 |
err = module_add_modinfo_attrs(mod); if (err) |
e17e0f51a
|
1417 |
goto out_unreg_param; |
c988d2b28
|
1418 |
|
80a3d1bb4
|
1419 |
add_usage_links(mod); |
8f6d03781
|
1420 1421 |
add_sect_attrs(mod, info); add_notes_attrs(mod, info); |
80a3d1bb4
|
1422 |
|
e17e0f51a
|
1423 |
kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4c
|
1424 |
return 0; |
e17e0f51a
|
1425 1426 |
out_unreg_param: module_param_sysfs_remove(mod); |
270a6c4ca
|
1427 |
out_unreg_holders: |
78a2d906b
|
1428 |
kobject_put(mod->holders_dir); |
270a6c4ca
|
1429 |
out_unreg: |
e17e0f51a
|
1430 |
kobject_put(&mod->mkobj.kobj); |
80a3d1bb4
|
1431 |
out: |
1da177e4c
|
1432 1433 |
return err; } |
34e4e2fef
|
1434 1435 1436 |
static void mod_sysfs_fini(struct module *mod) { |
8f6d03781
|
1437 1438 |
remove_notes_attrs(mod); remove_sect_attrs(mod); |
34e4e2fef
|
1439 1440 |
kobject_put(&mod->mkobj.kobj); } |
8f6d03781
|
1441 |
#else /* !CONFIG_SYSFS */ |
34e4e2fef
|
1442 |
|
8f6d03781
|
1443 1444 |
static int mod_sysfs_setup(struct module *mod, const struct load_info *info, |
6407ebb27
|
1445 1446 1447 1448 1449 |
struct kernel_param *kparam, unsigned int num_params) { return 0; } |
34e4e2fef
|
1450 1451 1452 |
static void mod_sysfs_fini(struct module *mod) { } |
36b0360d1
|
1453 1454 1455 |
static void module_remove_modinfo_attrs(struct module *mod) { } |
80a3d1bb4
|
1456 1457 1458 |
static void del_usage_links(struct module *mod) { } |
34e4e2fef
|
1459 |
#endif /* CONFIG_SYSFS */ |
1da177e4c
|
1460 |
|
36b0360d1
|
1461 |
static void mod_sysfs_teardown(struct module *mod) |
1da177e4c
|
1462 |
{ |
80a3d1bb4
|
1463 |
del_usage_links(mod); |
c988d2b28
|
1464 |
module_remove_modinfo_attrs(mod); |
1da177e4c
|
1465 |
module_param_sysfs_remove(mod); |
78a2d906b
|
1466 1467 |
kobject_put(mod->mkobj.drivers_dir); kobject_put(mod->holders_dir); |
34e4e2fef
|
1468 |
mod_sysfs_fini(mod); |
1da177e4c
|
1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 |
} /* * unlink the module with the whole machine is stopped with interrupts off * - this defends against kallsyms not taking locks */ static int __unlink_module(void *_mod) { struct module *mod = _mod; list_del(&mod->list); |
5336377d6
|
1479 |
module_bug_cleanup(mod); |
1da177e4c
|
1480 1481 |
return 0; } |
75676500f
|
1482 |
/* Free a module, remove from lists, etc. */ |
1da177e4c
|
1483 1484 |
static void free_module(struct module *mod) { |
7ead8b831
|
1485 |
trace_module_free(mod); |
1da177e4c
|
1486 |
/* Delete from various lists */ |
75676500f
|
1487 |
mutex_lock(&module_mutex); |
9b1a4d383
|
1488 |
stop_machine(__unlink_module, mod, NULL); |
75676500f
|
1489 |
mutex_unlock(&module_mutex); |
36b0360d1
|
1490 |
mod_sysfs_teardown(mod); |
1da177e4c
|
1491 |
|
b82bab4bb
|
1492 1493 |
/* Remove dynamic debug info */ ddebug_remove_module(mod->name); |
1da177e4c
|
1494 1495 1496 1497 1498 |
/* Arch-specific cleanup. */ module_arch_cleanup(mod); /* Module unload stuff */ module_unload_free(mod); |
e180a6b77
|
1499 1500 |
/* Free any allocated parameters. */ destroy_params(mod->kp, mod->num_kp); |
1da177e4c
|
1501 1502 1503 |
/* This may be NULL, but that's OK */ module_free(mod, mod->module_init); kfree(mod->args); |
259354dea
|
1504 |
percpu_modfree(mod); |
9f85a4bbb
|
1505 |
|
fbb9ce953
|
1506 1507 |
/* Free lock-classes: */ lockdep_free_key_range(mod->module_core, mod->core_size); |
1da177e4c
|
1508 1509 |
/* Finally, free the core (containing the module structure) */ module_free(mod, mod->module_core); |
eb8cdec4a
|
1510 1511 1512 1513 |
#ifdef CONFIG_MPU update_protections(current->mm); #endif |
1da177e4c
|
1514 1515 1516 1517 1518 |
} void *__symbol_get(const char *symbol) { struct module *owner; |
414fd31b2
|
1519 |
const struct kernel_symbol *sym; |
1da177e4c
|
1520 |
|
24da1cbff
|
1521 |
preempt_disable(); |
414fd31b2
|
1522 1523 1524 |
sym = find_symbol(symbol, &owner, NULL, true, true); if (sym && strong_try_module_get(owner)) sym = NULL; |
24da1cbff
|
1525 |
preempt_enable(); |
1da177e4c
|
1526 |
|
414fd31b2
|
1527 |
return sym ? (void *)sym->value : NULL; |
1da177e4c
|
1528 1529 |
} EXPORT_SYMBOL_GPL(__symbol_get); |
eea8b54dc
|
1530 1531 |
/* * Ensure that an exported symbol [global namespace] does not already exist |
02a3e59a0
|
1532 |
* in the kernel or in some other module's exported symbol table. |
be593f4ce
|
1533 1534 |
* * You must hold the module_mutex. |
eea8b54dc
|
1535 1536 1537 |
*/ static int verify_export_symbols(struct module *mod) { |
b211104d1
|
1538 |
unsigned int i; |
eea8b54dc
|
1539 |
struct module *owner; |
b211104d1
|
1540 1541 1542 1543 1544 1545 1546 1547 |
const struct kernel_symbol *s; struct { const struct kernel_symbol *sym; unsigned int num; } arr[] = { { mod->syms, mod->num_syms }, { mod->gpl_syms, mod->num_gpl_syms }, { mod->gpl_future_syms, mod->num_gpl_future_syms }, |
f7f5b6755
|
1548 |
#ifdef CONFIG_UNUSED_SYMBOLS |
b211104d1
|
1549 1550 |
{ mod->unused_syms, mod->num_unused_syms }, { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, |
f7f5b6755
|
1551 |
#endif |
b211104d1
|
1552 |
}; |
eea8b54dc
|
1553 |
|
b211104d1
|
1554 1555 |
for (i = 0; i < ARRAY_SIZE(arr); i++) { for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { |
be593f4ce
|
1556 |
if (find_symbol(s->name, &owner, NULL, true, false)) { |
b211104d1
|
1557 1558 1559 1560 1561 1562 1563 |
printk(KERN_ERR "%s: exports duplicate symbol %s" " (owned by %s) ", mod->name, s->name, module_name(owner)); return -ENOEXEC; } |
eea8b54dc
|
1564 |
} |
b211104d1
|
1565 1566 |
} return 0; |
eea8b54dc
|
1567 |
} |
9a4b9708f
|
1568 |
/* Change all symbols so that st_value encodes the pointer directly. */ |
49668688d
|
1569 1570 1571 1572 |
static int simplify_symbols(struct module *mod, const struct load_info *info) { Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; Elf_Sym *sym = (void *)symsec->sh_addr; |
1da177e4c
|
1573 |
unsigned long secbase; |
49668688d
|
1574 |
unsigned int i; |
1da177e4c
|
1575 |
int ret = 0; |
414fd31b2
|
1576 |
const struct kernel_symbol *ksym; |
1da177e4c
|
1577 |
|
49668688d
|
1578 1579 |
for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { const char *name = info->strtab + sym[i].st_name; |
1da177e4c
|
1580 1581 1582 1583 |
switch (sym[i].st_shndx) { case SHN_COMMON: /* We compiled with -fno-common. These are not supposed to happen. */ |
49668688d
|
1584 1585 |
DEBUGP("Common symbol: %s ", name); |
1da177e4c
|
1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 |
printk("%s: please compile with -fno-common ", mod->name); ret = -ENOEXEC; break; case SHN_ABS: /* Don't need to do anything */ DEBUGP("Absolute symbol: 0x%08lx ", (long)sym[i].st_value); break; case SHN_UNDEF: |
49668688d
|
1600 |
ksym = resolve_symbol_wait(mod, info, name); |
1da177e4c
|
1601 |
/* Ok if resolved. */ |
9bea7f239
|
1602 |
if (ksym && !IS_ERR(ksym)) { |
414fd31b2
|
1603 |
sym[i].st_value = ksym->value; |
1da177e4c
|
1604 |
break; |
414fd31b2
|
1605 |
} |
1da177e4c
|
1606 |
/* Ok if weak. */ |
9bea7f239
|
1607 |
if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4c
|
1608 |
break; |
9bea7f239
|
1609 1610 |
printk(KERN_WARNING "%s: Unknown symbol %s (err %li) ", |
49668688d
|
1611 |
mod->name, name, PTR_ERR(ksym)); |
9bea7f239
|
1612 |
ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4c
|
1613 1614 1615 1616 |
break; default: /* Divert to percpu allocation if a percpu var. */ |
49668688d
|
1617 |
if (sym[i].st_shndx == info->index.pcpu) |
259354dea
|
1618 |
secbase = (unsigned long)mod_percpu(mod); |
1da177e4c
|
1619 |
else |
49668688d
|
1620 |
secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4c
|
1621 1622 1623 1624 1625 1626 1627 |
sym[i].st_value += secbase; break; } } return ret; } |
49668688d
|
1628 |
static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268ebe
|
1629 1630 1631 1632 1633 |
{ unsigned int i; int err = 0; /* Now do relocations. */ |
49668688d
|
1634 1635 |
for (i = 1; i < info->hdr->e_shnum; i++) { unsigned int infosec = info->sechdrs[i].sh_info; |
22e268ebe
|
1636 1637 |
/* Not a valid relocation section? */ |
49668688d
|
1638 |
if (infosec >= info->hdr->e_shnum) |
22e268ebe
|
1639 1640 1641 |
continue; /* Don't bother with non-allocated sections */ |
49668688d
|
1642 |
if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268ebe
|
1643 |
continue; |
49668688d
|
1644 1645 1646 1647 1648 1649 |
if (info->sechdrs[i].sh_type == SHT_REL) err = apply_relocate(info->sechdrs, info->strtab, info->index.sym, i, mod); else if (info->sechdrs[i].sh_type == SHT_RELA) err = apply_relocate_add(info->sechdrs, info->strtab, info->index.sym, i, mod); |
22e268ebe
|
1650 1651 1652 1653 1654 |
if (err < 0) break; } return err; } |
088af9a6e
|
1655 1656 1657 1658 1659 1660 1661 |
/* Additional bytes needed by arch in front of individual sections */ unsigned int __weak arch_mod_section_prepend(struct module *mod, unsigned int section) { /* default implementation just returns zero */ return 0; } |
1da177e4c
|
1662 |
/* Update size with this section: return offset. */ |
088af9a6e
|
1663 1664 |
static long get_offset(struct module *mod, unsigned int *size, Elf_Shdr *sechdr, unsigned int section) |
1da177e4c
|
1665 1666 |
{ long ret; |
088af9a6e
|
1667 |
*size += arch_mod_section_prepend(mod, section); |
1da177e4c
|
1668 1669 1670 1671 1672 1673 1674 1675 1676 |
ret = ALIGN(*size, sechdr->sh_addralign ?: 1); *size = ret + sechdr->sh_size; return ret; } /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld might -- code, read-only data, read-write data, small data. Tally sizes, and place the offsets into sh_entsize fields: high bit means it belongs in init. */ |
49668688d
|
1677 |
static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4c
|
1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 |
{ static unsigned long const masks[][2] = { /* NOTE: all executable code must be the first section * in this array; otherwise modify the text_size * finder in the two loops below */ { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, { ARCH_SHF_SMALL | SHF_ALLOC, 0 } }; unsigned int m, i; |
49668688d
|
1689 1690 |
for (i = 0; i < info->hdr->e_shnum; i++) info->sechdrs[i].sh_entsize = ~0UL; |
1da177e4c
|
1691 1692 1693 1694 |
DEBUGP("Core section allocation order: "); for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688d
|
1695 1696 1697 |
for (i = 0; i < info->hdr->e_shnum; ++i) { Elf_Shdr *s = &info->sechdrs[i]; const char *sname = info->secstrings + s->sh_name; |
1da177e4c
|
1698 1699 1700 1701 |
if ((s->sh_flags & masks[m][0]) != masks[m][0] || (s->sh_flags & masks[m][1]) || s->sh_entsize != ~0UL |
49668688d
|
1702 |
|| strstarts(sname, ".init")) |
1da177e4c
|
1703 |
continue; |
088af9a6e
|
1704 |
s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
49668688d
|
1705 1706 |
DEBUGP("\t%s ", name); |
1da177e4c
|
1707 1708 1709 1710 1711 1712 1713 1714 |
} if (m == 0) mod->core_text_size = mod->core_size; } DEBUGP("Init section allocation order: "); for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688d
|
1715 1716 1717 |
for (i = 0; i < info->hdr->e_shnum; ++i) { Elf_Shdr *s = &info->sechdrs[i]; const char *sname = info->secstrings + s->sh_name; |
1da177e4c
|
1718 1719 1720 1721 |
if ((s->sh_flags & masks[m][0]) != masks[m][0] || (s->sh_flags & masks[m][1]) || s->sh_entsize != ~0UL |
49668688d
|
1722 |
|| !strstarts(sname, ".init")) |
1da177e4c
|
1723 |
continue; |
088af9a6e
|
1724 |
s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4c
|
1725 |
| INIT_OFFSET_MASK); |
49668688d
|
1726 1727 |
DEBUGP("\t%s ", sname); |
1da177e4c
|
1728 1729 1730 1731 1732 |
} if (m == 0) mod->init_text_size = mod->init_size; } } |
1da177e4c
|
1733 1734 1735 1736 |
static void set_license(struct module *mod, const char *license) { if (!license) license = "unspecified"; |
fa3ba2e81
|
1737 |
if (!license_is_gpl_compatible(license)) { |
25ddbb18a
|
1738 |
if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d26276
|
1739 |
printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e81
|
1740 1741 1742 |
"kernel. ", mod->name, license); add_taint_module(mod, TAINT_PROPRIETARY_MODULE); |
1da177e4c
|
1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 |
} } /* Parse tag=value strings from .modinfo section */ static char *next_string(char *string, unsigned long *secsize) { /* Skip non-zero chars */ while (string[0]) { string++; if ((*secsize)-- <= 1) return NULL; } /* Skip any zero padding. */ while (!string[0]) { string++; if ((*secsize)-- <= 1) return NULL; } return string; } |
49668688d
|
1764 |
static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4c
|
1765 1766 1767 |
{ char *p; unsigned int taglen = strlen(tag); |
49668688d
|
1768 1769 |
Elf_Shdr *infosec = &info->sechdrs[info->index.info]; unsigned long size = infosec->sh_size; |
1da177e4c
|
1770 |
|
49668688d
|
1771 |
for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4c
|
1772 1773 1774 1775 1776 |
if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') return p + taglen + 1; } return NULL; } |
49668688d
|
1777 |
static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b28
|
1778 1779 1780 1781 1782 1783 |
{ struct module_attribute *attr; int i; for (i = 0; (attr = modinfo_attrs[i]); i++) { if (attr->setup) |
49668688d
|
1784 |
attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b28
|
1785 1786 |
} } |
c988d2b28
|
1787 |
|
a263f7763
|
1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 |
static void free_modinfo(struct module *mod) { struct module_attribute *attr; int i; for (i = 0; (attr = modinfo_attrs[i]); i++) { if (attr->free) attr->free(mod); } } |
1da177e4c
|
1798 |
#ifdef CONFIG_KALLSYMS |
15bba37d6
|
1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 |
/* lookup symbol in given range of kernel_symbols */ static const struct kernel_symbol *lookup_symbol(const char *name, const struct kernel_symbol *start, const struct kernel_symbol *stop) { const struct kernel_symbol *ks = start; for (; ks < stop; ks++) if (strcmp(ks->name, name) == 0) return ks; return NULL; } |
ca4787b77
|
1811 1812 |
static int is_exported(const char *name, unsigned long value, const struct module *mod) |
1da177e4c
|
1813 |
{ |
ca4787b77
|
1814 1815 1816 |
const struct kernel_symbol *ks; if (!mod) ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f4
|
1817 |
else |
ca4787b77
|
1818 1819 |
ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); return ks != NULL && ks->value == value; |
1da177e4c
|
1820 1821 1822 |
} /* As per nm */ |
eded41c1c
|
1823 |
static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4c
|
1824 |
{ |
eded41c1c
|
1825 |
const Elf_Shdr *sechdrs = info->sechdrs; |
1da177e4c
|
1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 |
if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) return 'v'; else return 'w'; } if (sym->st_shndx == SHN_UNDEF) return 'U'; if (sym->st_shndx == SHN_ABS) return 'a'; if (sym->st_shndx >= SHN_LORESERVE) return '?'; if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) return 't'; if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) return 'r'; else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) return 'g'; else return 'd'; } if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) return 's'; else return 'b'; } |
eded41c1c
|
1855 1856 |
if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, ".debug")) { |
1da177e4c
|
1857 |
return 'n'; |
eded41c1c
|
1858 |
} |
1da177e4c
|
1859 1860 |
return '?'; } |
4a4962263
|
1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 |
static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, unsigned int shnum) { const Elf_Shdr *sec; if (src->st_shndx == SHN_UNDEF || src->st_shndx >= shnum || !src->st_name) return false; sec = sechdrs + src->st_shndx; if (!(sec->sh_flags & SHF_ALLOC) #ifndef CONFIG_KALLSYMS_ALL || !(sec->sh_flags & SHF_EXECINSTR) #endif || (sec->sh_entsize & INIT_OFFSET_MASK)) return false; return true; } |
49668688d
|
1881 |
static void layout_symtab(struct module *mod, struct load_info *info) |
4a4962263
|
1882 |
{ |
49668688d
|
1883 1884 |
Elf_Shdr *symsect = info->sechdrs + info->index.sym; Elf_Shdr *strsect = info->sechdrs + info->index.str; |
4a4962263
|
1885 1886 1887 1888 1889 1890 |
const Elf_Sym *src; unsigned int i, nsrc, ndst; /* Put symbol section at end of init part of module. */ symsect->sh_flags |= SHF_ALLOC; symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, |
49668688d
|
1891 1892 1893 |
info->index.sym) | INIT_OFFSET_MASK; DEBUGP("\t%s ", info->secstrings + symsect->sh_name); |
4a4962263
|
1894 |
|
49668688d
|
1895 |
src = (void *)info->hdr + symsect->sh_offset; |
4a4962263
|
1896 1897 |
nsrc = symsect->sh_size / sizeof(*src); for (ndst = i = 1; i < nsrc; ++i, ++src) |
49668688d
|
1898 |
if (is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) { |
554bdfe5a
|
1899 |
unsigned int j = src->st_name; |
49668688d
|
1900 1901 |
while (!__test_and_set_bit(j, info->strmap) && info->strtab[j]) |
554bdfe5a
|
1902 |
++j; |
4a4962263
|
1903 |
++ndst; |
554bdfe5a
|
1904 |
} |
4a4962263
|
1905 1906 |
/* Append room for core symbols at end of core part. */ |
49668688d
|
1907 1908 |
info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym); |
4a4962263
|
1909 |
|
554bdfe5a
|
1910 1911 1912 |
/* Put string table section at end of init part of module. */ strsect->sh_flags |= SHF_ALLOC; strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, |
49668688d
|
1913 1914 1915 |
info->index.str) | INIT_OFFSET_MASK; DEBUGP("\t%s ", info->secstrings + strsect->sh_name); |
554bdfe5a
|
1916 1917 |
/* Append room for core symbols' strings at end of core part. */ |
49668688d
|
1918 1919 1920 |
info->stroffs = mod->core_size; __set_bit(0, info->strmap); mod->core_size += bitmap_weight(info->strmap, strsect->sh_size); |
4a4962263
|
1921 |
} |
811d66a0e
|
1922 |
static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4c
|
1923 |
{ |
4a4962263
|
1924 1925 1926 |
unsigned int i, ndst; const Elf_Sym *src; Elf_Sym *dst; |
554bdfe5a
|
1927 |
char *s; |
eded41c1c
|
1928 |
Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4c
|
1929 |
|
eded41c1c
|
1930 1931 |
mod->symtab = (void *)symsec->sh_addr; mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); |
511ca6ae4
|
1932 1933 |
/* Make sure we get permanent strtab: don't use info->strtab. */ mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1da177e4c
|
1934 1935 1936 |
/* Set types up while we still have access to sections. */ for (i = 0; i < mod->num_symtab; i++) |
eded41c1c
|
1937 |
mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a4962263
|
1938 |
|
d913188c7
|
1939 |
mod->core_symtab = dst = mod->module_core + info->symoffs; |
4a4962263
|
1940 1941 1942 |
src = mod->symtab; *dst = *src; for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) { |
eded41c1c
|
1943 |
if (!is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) |
4a4962263
|
1944 1945 |
continue; dst[ndst] = *src; |
d913188c7
|
1946 1947 |
dst[ndst].st_name = bitmap_weight(info->strmap, dst[ndst].st_name); |
4a4962263
|
1948 1949 1950 |
++ndst; } mod->core_num_syms = ndst; |
554bdfe5a
|
1951 |
|
d913188c7
|
1952 |
mod->core_strtab = s = mod->module_core + info->stroffs; |
eded41c1c
|
1953 |
for (*s = 0, i = 1; i < info->sechdrs[info->index.str].sh_size; ++i) |
d913188c7
|
1954 |
if (test_bit(i, info->strmap)) |
554bdfe5a
|
1955 |
*++s = mod->strtab[i]; |
1da177e4c
|
1956 1957 |
} #else |
49668688d
|
1958 |
static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a4962263
|
1959 1960 |
{ } |
3ae91c21d
|
1961 |
|
abbce906d
|
1962 |
static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4c
|
1963 1964 1965 |
{ } #endif /* CONFIG_KALLSYMS */ |
e9d376f0f
|
1966 |
static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15beb
|
1967 |
{ |
811d66a0e
|
1968 1969 |
if (!debug) return; |
e9d376f0f
|
1970 1971 1972 1973 1974 1975 |
#ifdef CONFIG_DYNAMIC_DEBUG if (ddebug_add_module(debug, num, debug->modname)) printk(KERN_ERR "dynamic debug error adding module: %s ", debug->modname); #endif |
5e458cc0f
|
1976 |
} |
346e15beb
|
1977 |
|
ff49d74ad
|
1978 1979 1980 1981 1982 |
static void dynamic_debug_remove(struct _ddebug *debug) { if (debug) ddebug_remove_module(debug->modname); } |
3a642e99b
|
1983 1984 1985 1986 1987 |
static void *module_alloc_update_bounds(unsigned long size) { void *ret = module_alloc(size); if (ret) { |
75676500f
|
1988 |
mutex_lock(&module_mutex); |
3a642e99b
|
1989 1990 1991 1992 1993 |
/* Update module bounds. */ if ((unsigned long)ret < module_addr_min) module_addr_min = (unsigned long)ret; if ((unsigned long)ret + size > module_addr_max) module_addr_max = (unsigned long)ret + size; |
75676500f
|
1994 |
mutex_unlock(&module_mutex); |
3a642e99b
|
1995 1996 1997 |
} return ret; } |
4f2294b6d
|
1998 |
#ifdef CONFIG_DEBUG_KMEMLEAK |
49668688d
|
1999 2000 |
static void kmemleak_load_module(const struct module *mod, const struct load_info *info) |
4f2294b6d
|
2001 2002 2003 2004 |
{ unsigned int i; /* only scan the sections containing data */ |
c017b4be3
|
2005 |
kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6d
|
2006 |
|
49668688d
|
2007 2008 2009 |
for (i = 1; i < info->hdr->e_shnum; i++) { const char *name = info->secstrings + info->sechdrs[i].sh_name; if (!(info->sechdrs[i].sh_flags & SHF_ALLOC)) |
4f2294b6d
|
2010 |
continue; |
49668688d
|
2011 |
if (!strstarts(name, ".data") && !strstarts(name, ".bss")) |
4f2294b6d
|
2012 |
continue; |
49668688d
|
2013 2014 |
kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, info->sechdrs[i].sh_size, GFP_KERNEL); |
4f2294b6d
|
2015 2016 2017 |
} } #else |
49668688d
|
2018 2019 |
static inline void kmemleak_load_module(const struct module *mod, const struct load_info *info) |
4f2294b6d
|
2020 2021 2022 |
{ } #endif |
6526c534b
|
2023 |
/* Sets info->hdr and info->len. */ |
d913188c7
|
2024 2025 2026 |
static int copy_and_check(struct load_info *info, const void __user *umod, unsigned long len, const char __user *uargs) |
40dd2560e
|
2027 2028 2029 2030 2031 2032 2033 2034 2035 |
{ int err; Elf_Ehdr *hdr; if (len < sizeof(*hdr)) return -ENOEXEC; /* Suck in entire file: we'll want most of it. */ /* vmalloc barfs on "unusual" numbers. Check here */ |
3264d3f9d
|
2036 |
if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) |
40dd2560e
|
2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 |
return -ENOMEM; if (copy_from_user(hdr, umod, len) != 0) { err = -EFAULT; goto free_hdr; } /* Sanity checks against insmoding binaries or wrong arch, weird elf version */ if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 || hdr->e_type != ET_REL || !elf_check_arch(hdr) || hdr->e_shentsize != sizeof(Elf_Shdr)) { err = -ENOEXEC; goto free_hdr; } if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) { err = -ENOEXEC; goto free_hdr; } |
d913188c7
|
2058 |
|
3264d3f9d
|
2059 2060 |
info->hdr = hdr; info->len = len; |
40dd2560e
|
2061 2062 2063 2064 2065 2066 |
return 0; free_hdr: vfree(hdr); return err; } |
d913188c7
|
2067 2068 |
static void free_copy(struct load_info *info) { |
d913188c7
|
2069 2070 |
vfree(info->hdr); } |
8b5f61a79
|
2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 |
static int rewrite_section_headers(struct load_info *info) { unsigned int i; /* This should always be true, but let's be sure. */ info->sechdrs[0].sh_addr = 0; for (i = 1; i < info->hdr->e_shnum; i++) { Elf_Shdr *shdr = &info->sechdrs[i]; if (shdr->sh_type != SHT_NOBITS && info->len < shdr->sh_offset + shdr->sh_size) { printk(KERN_ERR "Module len %lu truncated ", info->len); return -ENOEXEC; } /* Mark all sections sh_addr with their address in the temporary image. */ shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; #ifndef CONFIG_MODULE_UNLOAD /* Don't load .exit sections */ if (strstarts(info->secstrings+shdr->sh_name, ".exit")) shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; #endif |
8b5f61a79
|
2097 |
} |
d6df72a06
|
2098 2099 |
/* Track but don't keep modinfo and version sections. */ |
49668688d
|
2100 2101 |
info->index.vers = find_sec(info, "__versions"); info->index.info = find_sec(info, ".modinfo"); |
d6df72a06
|
2102 2103 |
info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
8b5f61a79
|
2104 2105 |
return 0; } |
3264d3f9d
|
2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 |
/* * Set up our basic convenience variables (pointers to section headers, * search for module section index etc), and do some basic section * verification. * * Return the temporary module pointer (we'll replace it with the final * one when we move the module sections around). */ static struct module *setup_load_info(struct load_info *info) { unsigned int i; |
8b5f61a79
|
2117 |
int err; |
3264d3f9d
|
2118 2119 2120 2121 |
struct module *mod; /* Set up the convenience variables */ info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; |
8b5f61a79
|
2122 2123 |
info->secstrings = (void *)info->hdr + info->sechdrs[info->hdr->e_shstrndx].sh_offset; |
3264d3f9d
|
2124 |
|
8b5f61a79
|
2125 2126 2127 |
err = rewrite_section_headers(info); if (err) return ERR_PTR(err); |
3264d3f9d
|
2128 |
|
8b5f61a79
|
2129 2130 |
/* Find internal symbols and strings. */ for (i = 1; i < info->hdr->e_shnum; i++) { |
3264d3f9d
|
2131 2132 2133 |
if (info->sechdrs[i].sh_type == SHT_SYMTAB) { info->index.sym = i; info->index.str = info->sechdrs[i].sh_link; |
8b5f61a79
|
2134 2135 2136 |
info->strtab = (char *)info->hdr + info->sechdrs[info->index.str].sh_offset; break; |
3264d3f9d
|
2137 |
} |
3264d3f9d
|
2138 |
} |
49668688d
|
2139 |
info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9d
|
2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 |
if (!info->index.mod) { printk(KERN_WARNING "No module found in object "); return ERR_PTR(-ENOEXEC); } /* This is temporary: point mod into copy of data. */ mod = (void *)info->sechdrs[info->index.mod].sh_addr; if (info->index.sym == 0) { printk(KERN_WARNING "%s: module has no symbols (stripped?) ", mod->name); return ERR_PTR(-ENOEXEC); } |
49668688d
|
2154 |
info->index.pcpu = find_pcpusec(info); |
3264d3f9d
|
2155 |
|
3264d3f9d
|
2156 2157 2158 2159 2160 |
/* Check module struct version now, before we try to use module. */ if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) return ERR_PTR(-ENOEXEC); return mod; |
3264d3f9d
|
2161 |
} |
49668688d
|
2162 |
static int check_modinfo(struct module *mod, struct load_info *info) |
40dd2560e
|
2163 |
{ |
49668688d
|
2164 |
const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560e
|
2165 2166 2167 2168 2169 2170 2171 |
int err; /* This is allowed: modprobe --force will invalidate it. */ if (!modmagic) { err = try_to_force_load(mod, "bad vermagic"); if (err) return err; |
49668688d
|
2172 |
} else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
40dd2560e
|
2173 2174 2175 2176 2177 |
printk(KERN_ERR "%s: version magic '%s' should be '%s' ", mod->name, modmagic, vermagic); return -ENOEXEC; } |
49668688d
|
2178 |
if (get_modinfo(info, "staging")) { |
40dd2560e
|
2179 2180 2181 2182 2183 2184 |
add_taint_module(mod, TAINT_CRAP); printk(KERN_WARNING "%s: module is from the staging directory," " the quality is unknown, you have been warned. ", mod->name); } |
22e268ebe
|
2185 2186 |
/* Set up license info based on the info section */ |
49668688d
|
2187 |
set_license(mod, get_modinfo(info, "license")); |
22e268ebe
|
2188 |
|
40dd2560e
|
2189 2190 |
return 0; } |
811d66a0e
|
2191 |
static void find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb9
|
2192 |
{ |
49668688d
|
2193 |
mod->kp = section_objs(info, "__param", |
f91a13bb9
|
2194 |
sizeof(*mod->kp), &mod->num_kp); |
49668688d
|
2195 |
mod->syms = section_objs(info, "__ksymtab", |
f91a13bb9
|
2196 |
sizeof(*mod->syms), &mod->num_syms); |
49668688d
|
2197 2198 |
mod->crcs = section_addr(info, "__kcrctab"); mod->gpl_syms = section_objs(info, "__ksymtab_gpl", |
f91a13bb9
|
2199 2200 |
sizeof(*mod->gpl_syms), &mod->num_gpl_syms); |
49668688d
|
2201 2202 |
mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); mod->gpl_future_syms = section_objs(info, |
f91a13bb9
|
2203 2204 2205 |
"__ksymtab_gpl_future", sizeof(*mod->gpl_future_syms), &mod->num_gpl_future_syms); |
49668688d
|
2206 |
mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb9
|
2207 2208 |
#ifdef CONFIG_UNUSED_SYMBOLS |
49668688d
|
2209 |
mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb9
|
2210 2211 |
sizeof(*mod->unused_syms), &mod->num_unused_syms); |
49668688d
|
2212 2213 |
mod->unused_crcs = section_addr(info, "__kcrctab_unused"); mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", |
f91a13bb9
|
2214 2215 |
sizeof(*mod->unused_gpl_syms), &mod->num_unused_gpl_syms); |
49668688d
|
2216 |
mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb9
|
2217 2218 |
#endif #ifdef CONFIG_CONSTRUCTORS |
49668688d
|
2219 |
mod->ctors = section_objs(info, ".ctors", |
f91a13bb9
|
2220 2221 2222 2223 |
sizeof(*mod->ctors), &mod->num_ctors); #endif #ifdef CONFIG_TRACEPOINTS |
49668688d
|
2224 |
mod->tracepoints = section_objs(info, "__tracepoints", |
f91a13bb9
|
2225 2226 2227 |
sizeof(*mod->tracepoints), &mod->num_tracepoints); #endif |
bf5438fca
|
2228 2229 2230 2231 2232 |
#ifdef HAVE_JUMP_LABEL mod->jump_entries = section_objs(info, "__jump_table", sizeof(*mod->jump_entries), &mod->num_jump_entries); #endif |
f91a13bb9
|
2233 |
#ifdef CONFIG_EVENT_TRACING |
49668688d
|
2234 |
mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb9
|
2235 2236 2237 2238 2239 2240 2241 2242 2243 |
sizeof(*mod->trace_events), &mod->num_trace_events); /* * This section contains pointers to allocated objects in the trace * code and not scanning it leads to false positives. */ kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) * mod->num_trace_events, GFP_KERNEL); #endif |
13b9b6e74
|
2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 |
#ifdef CONFIG_TRACING mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", sizeof(*mod->trace_bprintk_fmt_start), &mod->num_trace_bprintk_fmt); /* * This section contains pointers to allocated objects in the trace * code and not scanning it leads to false positives. */ kmemleak_scan_area(mod->trace_bprintk_fmt_start, sizeof(*mod->trace_bprintk_fmt_start) * mod->num_trace_bprintk_fmt, GFP_KERNEL); #endif |
f91a13bb9
|
2256 2257 |
#ifdef CONFIG_FTRACE_MCOUNT_RECORD /* sechdrs[0].sh_size is always zero */ |
49668688d
|
2258 |
mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb9
|
2259 2260 2261 |
sizeof(*mod->ftrace_callsites), &mod->num_ftrace_callsites); #endif |
22e268ebe
|
2262 |
|
811d66a0e
|
2263 2264 |
mod->extable = section_objs(info, "__ex_table", sizeof(*mod->extable), &mod->num_exentries); |
49668688d
|
2265 |
if (section_addr(info, "__obsparm")) |
22e268ebe
|
2266 2267 2268 |
printk(KERN_WARNING "%s: Ignoring obsolete parameters ", mod->name); |
811d66a0e
|
2269 2270 2271 |
info->debug = section_objs(info, "__verbose", sizeof(*info->debug), &info->num_debug); |
f91a13bb9
|
2272 |
} |
49668688d
|
2273 |
static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4d
|
2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 |
{ int i; void *ptr; /* Do the allocs. */ ptr = module_alloc_update_bounds(mod->core_size); /* * The pointer to this block is stored in the module structure * which is inside the block. Just mark it as not being a * leak. */ kmemleak_not_leak(ptr); if (!ptr) |
d913188c7
|
2287 |
return -ENOMEM; |
65b8a9b4d
|
2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 |
memset(ptr, 0, mod->core_size); mod->module_core = ptr; ptr = module_alloc_update_bounds(mod->init_size); /* * The pointer to this block is stored in the module structure * which is inside the block. This block doesn't need to be * scanned as it contains data and code that will be freed * after the module is initialized. */ kmemleak_ignore(ptr); if (!ptr && mod->init_size) { module_free(mod, mod->module_core); |
d913188c7
|
2302 |
return -ENOMEM; |
65b8a9b4d
|
2303 2304 2305 2306 2307 2308 2309 |
} memset(ptr, 0, mod->init_size); mod->module_init = ptr; /* Transfer each section which specifies SHF_ALLOC */ DEBUGP("final section addresses: "); |
49668688d
|
2310 |
for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4d
|
2311 |
void *dest; |
49668688d
|
2312 |
Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4d
|
2313 |
|
49668688d
|
2314 |
if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4d
|
2315 |
continue; |
49668688d
|
2316 |
if (shdr->sh_entsize & INIT_OFFSET_MASK) |
65b8a9b4d
|
2317 |
dest = mod->module_init |
49668688d
|
2318 |
+ (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4d
|
2319 |
else |
49668688d
|
2320 |
dest = mod->module_core + shdr->sh_entsize; |
65b8a9b4d
|
2321 |
|
49668688d
|
2322 2323 |
if (shdr->sh_type != SHT_NOBITS) memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); |
65b8a9b4d
|
2324 |
/* Update sh_addr to point to copy in image. */ |
49668688d
|
2325 |
shdr->sh_addr = (unsigned long)dest; |
65b8a9b4d
|
2326 2327 |
DEBUGP("\t0x%lx %s ", |
49668688d
|
2328 |
shdr->sh_addr, info->secstrings + shdr->sh_name); |
65b8a9b4d
|
2329 |
} |
d913188c7
|
2330 2331 |
return 0; |
65b8a9b4d
|
2332 |
} |
49668688d
|
2333 |
static int check_module_license_and_versions(struct module *mod) |
22e268ebe
|
2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 |
{ /* * ndiswrapper is under GPL by itself, but loads proprietary modules. * Don't use add_taint_module(), as it would prevent ndiswrapper from * using GPL-only symbols it needs. */ if (strcmp(mod->name, "ndiswrapper") == 0) add_taint(TAINT_PROPRIETARY_MODULE); /* driverloader was caught wrongly pretending to be under GPL */ if (strcmp(mod->name, "driverloader") == 0) add_taint_module(mod, TAINT_PROPRIETARY_MODULE); #ifdef CONFIG_MODVERSIONS if ((mod->num_syms && !mod->crcs) || (mod->num_gpl_syms && !mod->gpl_crcs) || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) #ifdef CONFIG_UNUSED_SYMBOLS || (mod->num_unused_syms && !mod->unused_crcs) || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) #endif ) { return try_to_force_load(mod, "no versions for exported symbols"); } #endif return 0; } static void flush_module_icache(const struct module *mod) { mm_segment_t old_fs; /* flush the icache in correct context */ old_fs = get_fs(); set_fs(KERNEL_DS); /* * Flush the instruction cache, since we've played with text. * Do it before processing of module parameters, so the module * can provide parameter accessor functions of its own. */ if (mod->module_init) flush_icache_range((unsigned long)mod->module_init, (unsigned long)mod->module_init + mod->init_size); flush_icache_range((unsigned long)mod->module_core, (unsigned long)mod->module_core + mod->core_size); set_fs(old_fs); } |
d913188c7
|
2385 |
static struct module *layout_and_allocate(struct load_info *info) |
1da177e4c
|
2386 |
{ |
d913188c7
|
2387 |
/* Module within temporary copy. */ |
1da177e4c
|
2388 |
struct module *mod; |
49668688d
|
2389 |
Elf_Shdr *pcpusec; |
d913188c7
|
2390 |
int err; |
3ae91c21d
|
2391 |
|
d913188c7
|
2392 2393 2394 |
mod = setup_load_info(info); if (IS_ERR(mod)) return mod; |
1da177e4c
|
2395 |
|
49668688d
|
2396 |
err = check_modinfo(mod, info); |
40dd2560e
|
2397 2398 |
if (err) return ERR_PTR(err); |
1da177e4c
|
2399 |
|
1da177e4c
|
2400 |
/* Allow arches to frob section contents and sizes. */ |
49668688d
|
2401 2402 |
err = module_frob_arch_sections(info->hdr, info->sechdrs, info->secstrings, mod); |
1da177e4c
|
2403 |
if (err < 0) |
6526c534b
|
2404 |
goto out; |
1da177e4c
|
2405 |
|
49668688d
|
2406 2407 |
pcpusec = &info->sechdrs[info->index.pcpu]; if (pcpusec->sh_size) { |
1da177e4c
|
2408 |
/* We have a special allocation for this section. */ |
49668688d
|
2409 2410 |
err = percpu_modalloc(mod, pcpusec->sh_size, pcpusec->sh_addralign); |
259354dea
|
2411 |
if (err) |
6526c534b
|
2412 |
goto out; |
49668688d
|
2413 |
pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4c
|
2414 2415 2416 2417 2418 |
} /* Determine total sizes, and put offsets in sh_entsize. For now this is done generically; there doesn't appear to be any special cases for the architectures. */ |
49668688d
|
2419 |
layout_sections(mod, info); |
d913188c7
|
2420 2421 2422 2423 2424 2425 2426 |
info->strmap = kzalloc(BITS_TO_LONGS(info->sechdrs[info->index.str].sh_size) * sizeof(long), GFP_KERNEL); if (!info->strmap) { err = -ENOMEM; goto free_percpu; } |
49668688d
|
2427 |
layout_symtab(mod, info); |
1da177e4c
|
2428 |
|
65b8a9b4d
|
2429 |
/* Allocate and move to the final place */ |
49668688d
|
2430 |
err = move_module(mod, info); |
d913188c7
|
2431 2432 2433 2434 2435 |
if (err) goto free_strmap; /* Module has been copied to its final place now: return it. */ mod = (void *)info->sechdrs[info->index.mod].sh_addr; |
49668688d
|
2436 |
kmemleak_load_module(mod, info); |
d913188c7
|
2437 2438 2439 2440 2441 2442 |
return mod; free_strmap: kfree(info->strmap); free_percpu: percpu_modfree(mod); |
6526c534b
|
2443 |
out: |
d913188c7
|
2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 |
return ERR_PTR(err); } /* mod is no longer valid after this! */ static void module_deallocate(struct module *mod, struct load_info *info) { kfree(info->strmap); percpu_modfree(mod); module_free(mod, mod->module_init); module_free(mod, mod->module_core); } |
811d66a0e
|
2455 2456 |
static int post_relocation(struct module *mod, const struct load_info *info) { |
51f3d0f47
|
2457 |
/* Sort exception table now relocations are done. */ |
811d66a0e
|
2458 2459 2460 2461 2462 |
sort_extable(mod->extable, mod->extable + mod->num_exentries); /* Copy relocated percpu area over. */ percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, info->sechdrs[info->index.pcpu].sh_size); |
51f3d0f47
|
2463 |
/* Setup kallsyms-specific fields. */ |
811d66a0e
|
2464 2465 2466 2467 2468 |
add_kallsyms(mod, info); /* Arch-specific module finalizing. */ return module_finalize(info->hdr, info->sechdrs, mod); } |
d913188c7
|
2469 2470 |
/* Allocate and load the module: note that size of section 0 is always zero, and we rely on this for optional sections. */ |
51f3d0f47
|
2471 |
static struct module *load_module(void __user *umod, |
d913188c7
|
2472 2473 2474 2475 2476 2477 |
unsigned long len, const char __user *uargs) { struct load_info info = { NULL, }; struct module *mod; long err; |
d913188c7
|
2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 |
DEBUGP("load_module: umod=%p, len=%lu, uargs=%p ", umod, len, uargs); /* Copy in the blobs from userspace, check they are vaguely sane. */ err = copy_and_check(&info, umod, len, uargs); if (err) return ERR_PTR(err); /* Figure out module layout, and allocate all the memory. */ mod = layout_and_allocate(&info); |
65b8a9b4d
|
2490 2491 |
if (IS_ERR(mod)) { err = PTR_ERR(mod); |
d913188c7
|
2492 |
goto free_copy; |
1da177e4c
|
2493 |
} |
1da177e4c
|
2494 |
|
49668688d
|
2495 |
/* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bbb
|
2496 2497 |
err = module_unload_init(mod); if (err) |
d913188c7
|
2498 |
goto free_module; |
1da177e4c
|
2499 |
|
22e268ebe
|
2500 2501 |
/* Now we've got everything in the final locations, we can * find optional sections. */ |
49668688d
|
2502 |
find_module_sections(mod, &info); |
9b37ccfc6
|
2503 |
|
49668688d
|
2504 |
err = check_module_license_and_versions(mod); |
22e268ebe
|
2505 2506 |
if (err) goto free_unload; |
9841d61d7
|
2507 |
|
c988d2b28
|
2508 |
/* Set up MODINFO_ATTR fields */ |
49668688d
|
2509 |
setup_modinfo(mod, &info); |
c988d2b28
|
2510 |
|
1da177e4c
|
2511 |
/* Fix up syms, so that st_value is a pointer to location. */ |
49668688d
|
2512 |
err = simplify_symbols(mod, &info); |
1da177e4c
|
2513 |
if (err < 0) |
d913188c7
|
2514 |
goto free_modinfo; |
1da177e4c
|
2515 |
|
49668688d
|
2516 |
err = apply_relocations(mod, &info); |
22e268ebe
|
2517 |
if (err < 0) |
d913188c7
|
2518 |
goto free_modinfo; |
1da177e4c
|
2519 |
|
811d66a0e
|
2520 |
err = post_relocation(mod, &info); |
1da177e4c
|
2521 |
if (err < 0) |
d913188c7
|
2522 |
goto free_modinfo; |
1da177e4c
|
2523 |
|
22e268ebe
|
2524 |
flush_module_icache(mod); |
378bac820
|
2525 |
|
6526c534b
|
2526 2527 2528 2529 2530 2531 |
/* Now copy in args */ mod->args = strndup_user(uargs, ~0UL >> 1); if (IS_ERR(mod->args)) { err = PTR_ERR(mod->args); goto free_arch_cleanup; } |
8d3b33f67
|
2532 |
|
51f3d0f47
|
2533 |
/* Mark state as coming so strong_try_module_get() ignores us. */ |
d913188c7
|
2534 |
mod->state = MODULE_STATE_COMING; |
bb9d3d56e
|
2535 |
/* Now sew it into the lists so we can get lockdep and oops |
d72b37513
|
2536 2537 2538 2539 2540 2541 |
* info during argument parsing. Noone should access us, since * strong_try_module_get() will fail. * lockdep/oops can run asynchronous, so use the RCU list insertion * function to insert in a way safe to concurrent readers. * The mutex protects against concurrent writers. */ |
75676500f
|
2542 |
mutex_lock(&module_mutex); |
3bafeb624
|
2543 2544 |
if (find_module(mod->name)) { err = -EEXIST; |
be593f4ce
|
2545 |
goto unlock; |
3bafeb624
|
2546 |
} |
811d66a0e
|
2547 2548 2549 |
/* This has to be done once we're sure module name is unique. */ if (!mod->taints) dynamic_debug_setup(info.debug, info.num_debug); |
ff49d74ad
|
2550 |
|
be593f4ce
|
2551 2552 2553 |
/* Find duplicate symbols */ err = verify_export_symbols(mod); if (err < 0) |
ff49d74ad
|
2554 |
goto ddebug; |
be593f4ce
|
2555 |
|
5336377d6
|
2556 |
module_bug_finalize(info.hdr, info.sechdrs, mod); |
d72b37513
|
2557 |
list_add_rcu(&mod->list, &modules); |
75676500f
|
2558 |
mutex_unlock(&module_mutex); |
bb9d3d56e
|
2559 |
|
51f3d0f47
|
2560 |
/* Module is ready to execute: parsing args may do that. */ |
e180a6b77
|
2561 |
err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL); |
1da177e4c
|
2562 |
if (err < 0) |
bb9d3d56e
|
2563 |
goto unlink; |
1da177e4c
|
2564 |
|
51f3d0f47
|
2565 |
/* Link in to syfs. */ |
8f6d03781
|
2566 |
err = mod_sysfs_setup(mod, &info, mod->kp, mod->num_kp); |
1da177e4c
|
2567 |
if (err < 0) |
bb9d3d56e
|
2568 |
goto unlink; |
80a3d1bb4
|
2569 |
|
d913188c7
|
2570 2571 2572 |
/* Get rid of temporary copy and strmap. */ kfree(info.strmap); free_copy(&info); |
1da177e4c
|
2573 2574 |
/* Done! */ |
51f3d0f47
|
2575 |
trace_module_load(mod); |
1da177e4c
|
2576 |
return mod; |
bb9d3d56e
|
2577 |
unlink: |
75676500f
|
2578 |
mutex_lock(&module_mutex); |
e91defa26
|
2579 2580 |
/* Unlink carefully: kallsyms could be walking list. */ list_del_rcu(&mod->list); |
5336377d6
|
2581 |
module_bug_cleanup(mod); |
ff49d74ad
|
2582 |
ddebug: |
811d66a0e
|
2583 2584 |
if (!mod->taints) dynamic_debug_remove(info.debug); |
be593f4ce
|
2585 |
unlock: |
75676500f
|
2586 |
mutex_unlock(&module_mutex); |
e91defa26
|
2587 |
synchronize_sched(); |
6526c534b
|
2588 2589 |
kfree(mod->args); free_arch_cleanup: |
1da177e4c
|
2590 |
module_arch_cleanup(mod); |
d913188c7
|
2591 |
free_modinfo: |
a263f7763
|
2592 |
free_modinfo(mod); |
22e268ebe
|
2593 |
free_unload: |
1da177e4c
|
2594 |
module_unload_free(mod); |
d913188c7
|
2595 2596 2597 2598 |
free_module: module_deallocate(mod, &info); free_copy: free_copy(&info); |
6fe2e70bb
|
2599 |
return ERR_PTR(err); |
1da177e4c
|
2600 |
} |
b99b87f70
|
2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 |
/* Call module constructors. */ static void do_mod_ctors(struct module *mod) { #ifdef CONFIG_CONSTRUCTORS unsigned long i; for (i = 0; i < mod->num_ctors; i++) mod->ctors[i](); #endif } |
1da177e4c
|
2611 |
/* This is where the real work happens */ |
17da2bd90
|
2612 2613 |
SYSCALL_DEFINE3(init_module, void __user *, umod, unsigned long, len, const char __user *, uargs) |
1da177e4c
|
2614 2615 2616 2617 2618 |
{ struct module *mod; int ret = 0; /* Must have permission */ |
3d43321b7
|
2619 |
if (!capable(CAP_SYS_MODULE) || modules_disabled) |
1da177e4c
|
2620 |
return -EPERM; |
1da177e4c
|
2621 2622 |
/* Do all the hard work */ mod = load_module(umod, len, uargs); |
75676500f
|
2623 |
if (IS_ERR(mod)) |
1da177e4c
|
2624 |
return PTR_ERR(mod); |
1da177e4c
|
2625 |
|
e041c6834
|
2626 2627 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_COMING, mod); |
1da177e4c
|
2628 |
|
b99b87f70
|
2629 |
do_mod_ctors(mod); |
1da177e4c
|
2630 2631 |
/* Start the module */ if (mod->init != NULL) |
59f9415ff
|
2632 |
ret = do_one_initcall(mod->init); |
1da177e4c
|
2633 2634 2635 2636 |
if (ret < 0) { /* Init routine failed: abort. Try to protect us from buggy refcounters. */ mod->state = MODULE_STATE_GOING; |
fbd568a3e
|
2637 |
synchronize_sched(); |
af49d9248
|
2638 |
module_put(mod); |
df4b565e1
|
2639 2640 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_GOING, mod); |
af49d9248
|
2641 |
free_module(mod); |
c9a3ba55b
|
2642 |
wake_up(&module_wq); |
1da177e4c
|
2643 2644 |
return ret; } |
e24e2e64c
|
2645 |
if (ret > 0) { |
ad361c988
|
2646 2647 2648 2649 2650 |
printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention " "%s: loading module anyway... ", |
e24e2e64c
|
2651 2652 2653 2654 |
__func__, mod->name, ret, __func__); dump_stack(); } |
1da177e4c
|
2655 |
|
6c5db22d2
|
2656 |
/* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4c
|
2657 |
mod->state = MODULE_STATE_LIVE; |
6c5db22d2
|
2658 |
wake_up(&module_wq); |
0deddf436
|
2659 2660 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_LIVE, mod); |
6c5db22d2
|
2661 |
|
d6de2c80e
|
2662 2663 |
/* We need to finish all async code before the module init sequence is done */ async_synchronize_full(); |
6c5db22d2
|
2664 |
mutex_lock(&module_mutex); |
1da177e4c
|
2665 2666 |
/* Drop initial reference. */ module_put(mod); |
ad6561dff
|
2667 |
trim_init_extable(mod); |
4a4962263
|
2668 2669 2670 |
#ifdef CONFIG_KALLSYMS mod->num_symtab = mod->core_num_syms; mod->symtab = mod->core_symtab; |
554bdfe5a
|
2671 |
mod->strtab = mod->core_strtab; |
4a4962263
|
2672 |
#endif |
1da177e4c
|
2673 2674 2675 2676 |
module_free(mod, mod->module_init); mod->module_init = NULL; mod->init_size = 0; mod->init_text_size = 0; |
6389a3851
|
2677 |
mutex_unlock(&module_mutex); |
1da177e4c
|
2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 |
return 0; } static inline int within(unsigned long addr, void *start, unsigned long size) { return ((void *)addr >= start && (void *)addr < start + size); } #ifdef CONFIG_KALLSYMS /* * This ignores the intensely annoying "mapping symbols" found * in ARM ELF files: $a, $t and $d. */ static inline int is_arm_mapping_symbol(const char *str) { |
22a8bdeb5
|
2694 |
return str[0] == '$' && strchr("atd", str[1]) |
1da177e4c
|
2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 |
&& (str[2] == '\0' || str[2] == '.'); } static const char *get_ksymbol(struct module *mod, unsigned long addr, unsigned long *size, unsigned long *offset) { unsigned int i, best = 0; unsigned long nextval; /* At worse, next value is at end of module */ |
a06f6211e
|
2707 |
if (within_module_init(addr, mod)) |
1da177e4c
|
2708 |
nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb5
|
2709 |
else |
1da177e4c
|
2710 2711 2712 |
nextval = (unsigned long)mod->module_core+mod->core_text_size; /* Scan for closest preceeding symbol, and next symbol. (ELF |
22a8bdeb5
|
2713 |
starts real symbols at 1). */ |
1da177e4c
|
2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 |
for (i = 1; i < mod->num_symtab; i++) { if (mod->symtab[i].st_shndx == SHN_UNDEF) continue; /* We ignore unnamed symbols: they're uninformative * and inserted at a whim. */ if (mod->symtab[i].st_value <= addr && mod->symtab[i].st_value > mod->symtab[best].st_value && *(mod->strtab + mod->symtab[i].st_name) != '\0' && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) best = i; if (mod->symtab[i].st_value > addr && mod->symtab[i].st_value < nextval && *(mod->strtab + mod->symtab[i].st_name) != '\0' && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) nextval = mod->symtab[i].st_value; } if (!best) return NULL; |
ffb451227
|
2734 2735 2736 2737 |
if (size) *size = nextval - mod->symtab[best].st_value; if (offset) *offset = addr - mod->symtab[best].st_value; |
1da177e4c
|
2738 2739 |
return mod->strtab + mod->symtab[best].st_name; } |
6dd06c9fb
|
2740 2741 |
/* For kallsyms to ask for address resolution. NULL means not found. Careful * not to lock to avoid deadlock on oopses, simply disable preemption. */ |
92dfc9dc7
|
2742 |
const char *module_address_lookup(unsigned long addr, |
6dd06c9fb
|
2743 2744 2745 2746 |
unsigned long *size, unsigned long *offset, char **modname, char *namebuf) |
1da177e4c
|
2747 2748 |
{ struct module *mod; |
cb2a52052
|
2749 |
const char *ret = NULL; |
1da177e4c
|
2750 |
|
cb2a52052
|
2751 |
preempt_disable(); |
d72b37513
|
2752 |
list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211e
|
2753 2754 |
if (within_module_init(addr, mod) || within_module_core(addr, mod)) { |
ffc508919
|
2755 2756 |
if (modname) *modname = mod->name; |
cb2a52052
|
2757 2758 |
ret = get_ksymbol(mod, addr, size, offset); break; |
1da177e4c
|
2759 2760 |
} } |
6dd06c9fb
|
2761 2762 2763 2764 2765 |
/* Make a copy in here where it's safe */ if (ret) { strncpy(namebuf, ret, KSYM_NAME_LEN - 1); ret = namebuf; } |
cb2a52052
|
2766 |
preempt_enable(); |
92dfc9dc7
|
2767 |
return ret; |
1da177e4c
|
2768 |
} |
9d65cb4a1
|
2769 2770 2771 |
int lookup_module_symbol_name(unsigned long addr, char *symname) { struct module *mod; |
cb2a52052
|
2772 |
preempt_disable(); |
d72b37513
|
2773 |
list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211e
|
2774 2775 |
if (within_module_init(addr, mod) || within_module_core(addr, mod)) { |
9d65cb4a1
|
2776 2777 2778 2779 2780 |
const char *sym; sym = get_ksymbol(mod, addr, NULL, NULL); if (!sym) goto out; |
9281acea6
|
2781 |
strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a52052
|
2782 |
preempt_enable(); |
9d65cb4a1
|
2783 2784 2785 2786 |
return 0; } } out: |
cb2a52052
|
2787 |
preempt_enable(); |
9d65cb4a1
|
2788 2789 |
return -ERANGE; } |
a5c43dae7
|
2790 2791 2792 2793 |
int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) { struct module *mod; |
cb2a52052
|
2794 |
preempt_disable(); |
d72b37513
|
2795 |
list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211e
|
2796 2797 |
if (within_module_init(addr, mod) || within_module_core(addr, mod)) { |
a5c43dae7
|
2798 2799 2800 2801 2802 2803 |
const char *sym; sym = get_ksymbol(mod, addr, size, offset); if (!sym) goto out; if (modname) |
9281acea6
|
2804 |
strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae7
|
2805 |
if (name) |
9281acea6
|
2806 |
strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a52052
|
2807 |
preempt_enable(); |
a5c43dae7
|
2808 2809 2810 2811 |
return 0; } } out: |
cb2a52052
|
2812 |
preempt_enable(); |
a5c43dae7
|
2813 2814 |
return -ERANGE; } |
ea07890a6
|
2815 2816 |
int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, char *name, char *module_name, int *exported) |
1da177e4c
|
2817 2818 |
{ struct module *mod; |
cb2a52052
|
2819 |
preempt_disable(); |
d72b37513
|
2820 |
list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4c
|
2821 2822 2823 |
if (symnum < mod->num_symtab) { *value = mod->symtab[symnum].st_value; *type = mod->symtab[symnum].st_info; |
098c5eea0
|
2824 |
strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea6
|
2825 2826 |
KSYM_NAME_LEN); strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b77
|
2827 |
*exported = is_exported(name, *value, mod); |
cb2a52052
|
2828 |
preempt_enable(); |
ea07890a6
|
2829 |
return 0; |
1da177e4c
|
2830 2831 2832 |
} symnum -= mod->num_symtab; } |
cb2a52052
|
2833 |
preempt_enable(); |
ea07890a6
|
2834 |
return -ERANGE; |
1da177e4c
|
2835 2836 2837 2838 2839 2840 2841 |
} static unsigned long mod_find_symname(struct module *mod, const char *name) { unsigned int i; for (i = 0; i < mod->num_symtab; i++) |
54e8ce463
|
2842 2843 |
if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && mod->symtab[i].st_info != 'U') |
1da177e4c
|
2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 |
return mod->symtab[i].st_value; return 0; } /* Look for this name: can be of form module:name. */ unsigned long module_kallsyms_lookup_name(const char *name) { struct module *mod; char *colon; unsigned long ret = 0; /* Don't lock: we're in enough trouble already. */ |
cb2a52052
|
2856 |
preempt_disable(); |
1da177e4c
|
2857 2858 2859 2860 2861 2862 |
if ((colon = strchr(name, ':')) != NULL) { *colon = '\0'; if ((mod = find_module(name)) != NULL) ret = mod_find_symname(mod, colon+1); *colon = ':'; } else { |
d72b37513
|
2863 |
list_for_each_entry_rcu(mod, &modules, list) |
1da177e4c
|
2864 2865 2866 |
if ((ret = mod_find_symname(mod, name)) != 0) break; } |
cb2a52052
|
2867 |
preempt_enable(); |
1da177e4c
|
2868 2869 |
return ret; } |
75a66614d
|
2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 |
int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, unsigned long), void *data) { struct module *mod; unsigned int i; int ret; list_for_each_entry(mod, &modules, list) { for (i = 0; i < mod->num_symtab; i++) { ret = fn(data, mod->strtab + mod->symtab[i].st_name, mod, mod->symtab[i].st_value); if (ret != 0) return ret; } } return 0; } |
1da177e4c
|
2889 |
#endif /* CONFIG_KALLSYMS */ |
21aa9280b
|
2890 |
static char *module_flags(struct module *mod, char *buf) |
fa3ba2e81
|
2891 2892 |
{ int bx = 0; |
21aa9280b
|
2893 2894 2895 |
if (mod->taints || mod->state == MODULE_STATE_GOING || mod->state == MODULE_STATE_COMING) { |
fa3ba2e81
|
2896 |
buf[bx++] = '('; |
25ddbb18a
|
2897 |
if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
fa3ba2e81
|
2898 |
buf[bx++] = 'P'; |
25ddbb18a
|
2899 |
if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
fa3ba2e81
|
2900 |
buf[bx++] = 'F'; |
26e9a3977
|
2901 |
if (mod->taints & (1 << TAINT_CRAP)) |
061b1bd39
|
2902 |
buf[bx++] = 'C'; |
fa3ba2e81
|
2903 2904 2905 2906 2907 |
/* * TAINT_FORCED_RMMOD: could be added. * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't * apply to modules. */ |
21aa9280b
|
2908 2909 2910 2911 2912 2913 2914 |
/* Show a - for module-is-being-unloaded */ if (mod->state == MODULE_STATE_GOING) buf[bx++] = '-'; /* Show a + for module-is-being-loaded */ if (mod->state == MODULE_STATE_COMING) buf[bx++] = '+'; |
fa3ba2e81
|
2915 2916 2917 2918 2919 2920 |
buf[bx++] = ')'; } buf[bx] = '\0'; return buf; } |
3b5d5c6b0
|
2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 |
#ifdef CONFIG_PROC_FS /* Called by the /proc file system to return a list of modules. */ static void *m_start(struct seq_file *m, loff_t *pos) { mutex_lock(&module_mutex); return seq_list_start(&modules, *pos); } static void *m_next(struct seq_file *m, void *p, loff_t *pos) { return seq_list_next(p, &modules, pos); } static void m_stop(struct seq_file *m, void *p) { mutex_unlock(&module_mutex); } |
1da177e4c
|
2938 2939 2940 |
static int m_show(struct seq_file *m, void *p) { struct module *mod = list_entry(p, struct module, list); |
fa3ba2e81
|
2941 |
char buf[8]; |
2f0f2a334
|
2942 |
seq_printf(m, "%s %u", |
1da177e4c
|
2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 |
mod->name, mod->init_size + mod->core_size); print_unload_info(m, mod); /* Informative for users. */ seq_printf(m, " %s", mod->state == MODULE_STATE_GOING ? "Unloading": mod->state == MODULE_STATE_COMING ? "Loading": "Live"); /* Used by oprofile and other similar tools. */ seq_printf(m, " 0x%p", mod->module_core); |
fa3ba2e81
|
2953 2954 |
/* Taints info */ if (mod->taints) |
21aa9280b
|
2955 |
seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e81
|
2956 |
|
1da177e4c
|
2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 |
seq_printf(m, " "); return 0; } /* Format: modulename size refcount deps address Where refcount is a number or -, and deps is a comma-separated list of depends or -. */ |
3b5d5c6b0
|
2967 |
static const struct seq_operations modules_op = { |
1da177e4c
|
2968 2969 2970 2971 2972 |
.start = m_start, .next = m_next, .stop = m_stop, .show = m_show }; |
3b5d5c6b0
|
2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 |
static int modules_open(struct inode *inode, struct file *file) { return seq_open(file, &modules_op); } static const struct file_operations proc_modules_operations = { .open = modules_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; static int __init proc_modules_init(void) { proc_create("modules", 0, NULL, &proc_modules_operations); return 0; } module_init(proc_modules_init); #endif |
1da177e4c
|
2992 2993 2994 |
/* Given an address, look for it in the module exception tables. */ const struct exception_table_entry *search_module_extables(unsigned long addr) { |
1da177e4c
|
2995 2996 |
const struct exception_table_entry *e = NULL; struct module *mod; |
24da1cbff
|
2997 |
preempt_disable(); |
d72b37513
|
2998 |
list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4c
|
2999 3000 |
if (mod->num_exentries == 0) continue; |
22a8bdeb5
|
3001 |
|
1da177e4c
|
3002 3003 3004 3005 3006 3007 |
e = search_extable(mod->extable, mod->extable + mod->num_exentries - 1, addr); if (e) break; } |
24da1cbff
|
3008 |
preempt_enable(); |
1da177e4c
|
3009 3010 |
/* Now, if we found one, we are running inside it now, hence |
22a8bdeb5
|
3011 |
we cannot unload the module, hence no refcnt needed. */ |
1da177e4c
|
3012 3013 |
return e; } |
4d435f9d8
|
3014 |
/* |
e610499e2
|
3015 3016 3017 3018 3019 |
* is_module_address - is this address inside a module? * @addr: the address to check. * * See is_module_text_address() if you simply want to see if the address * is code (not data). |
4d435f9d8
|
3020 |
*/ |
e610499e2
|
3021 |
bool is_module_address(unsigned long addr) |
4d435f9d8
|
3022 |
{ |
e610499e2
|
3023 |
bool ret; |
4d435f9d8
|
3024 |
|
24da1cbff
|
3025 |
preempt_disable(); |
e610499e2
|
3026 |
ret = __module_address(addr) != NULL; |
24da1cbff
|
3027 |
preempt_enable(); |
4d435f9d8
|
3028 |
|
e610499e2
|
3029 |
return ret; |
4d435f9d8
|
3030 |
} |
e610499e2
|
3031 3032 3033 3034 3035 3036 3037 |
/* * __module_address - get the module which contains an address. * @addr: the address. * * Must be called with preempt disabled or module mutex held so that * module doesn't get freed during this. */ |
714f83d5d
|
3038 |
struct module *__module_address(unsigned long addr) |
1da177e4c
|
3039 3040 |
{ struct module *mod; |
3a642e99b
|
3041 3042 |
if (addr < module_addr_min || addr > module_addr_max) return NULL; |
d72b37513
|
3043 |
list_for_each_entry_rcu(mod, &modules, list) |
e610499e2
|
3044 3045 |
if (within_module_core(addr, mod) || within_module_init(addr, mod)) |
1da177e4c
|
3046 3047 3048 |
return mod; return NULL; } |
c6b378019
|
3049 |
EXPORT_SYMBOL_GPL(__module_address); |
1da177e4c
|
3050 |
|
e610499e2
|
3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 |
/* * is_module_text_address - is this address inside module code? * @addr: the address to check. * * See is_module_address() if you simply want to see if the address is * anywhere in a module. See kernel_text_address() for testing if an * address corresponds to kernel or module code. */ bool is_module_text_address(unsigned long addr) { bool ret; preempt_disable(); ret = __module_text_address(addr) != NULL; preempt_enable(); return ret; } /* * __module_text_address - get the module whose code contains an address. * @addr: the address. * * Must be called with preempt disabled or module mutex held so that * module doesn't get freed during this. */ struct module *__module_text_address(unsigned long addr) { struct module *mod = __module_address(addr); if (mod) { /* Make sure it's within the text section. */ if (!within(addr, mod->module_init, mod->init_text_size) && !within(addr, mod->module_core, mod->core_text_size)) mod = NULL; } return mod; } |
c6b378019
|
3088 |
EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e2
|
3089 |
|
1da177e4c
|
3090 3091 3092 3093 |
/* Don't grab lock, we're oopsing. */ void print_modules(void) { struct module *mod; |
2bc2d61a9
|
3094 |
char buf[8]; |
1da177e4c
|
3095 |
|
b231125af
|
3096 |
printk(KERN_DEFAULT "Modules linked in:"); |
d72b37513
|
3097 3098 3099 |
/* Most callers should already have preempt disabled, but make sure */ preempt_disable(); list_for_each_entry_rcu(mod, &modules, list) |
21aa9280b
|
3100 |
printk(" %s%s", mod->name, module_flags(mod, buf)); |
d72b37513
|
3101 |
preempt_enable(); |
e14af7eeb
|
3102 3103 |
if (last_unloaded_module[0]) printk(" [last unloaded: %s]", last_unloaded_module); |
1da177e4c
|
3104 3105 3106 |
printk(" "); } |
1da177e4c
|
3107 |
#ifdef CONFIG_MODVERSIONS |
8c8ef42ae
|
3108 3109 3110 3111 3112 3113 |
/* Generate the signature for all relevant module structures here. * If these change, we don't want to try to parse the module. */ void module_layout(struct module *mod, struct modversion_info *ver, struct kernel_param *kp, struct kernel_symbol *ks, |
8c8ef42ae
|
3114 3115 3116 3117 |
struct tracepoint *tp) { } EXPORT_SYMBOL(module_layout); |
1da177e4c
|
3118 |
#endif |
8256e47cd
|
3119 |
|
97e1c18e8
|
3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 |
#ifdef CONFIG_TRACEPOINTS void module_update_tracepoints(void) { struct module *mod; mutex_lock(&module_mutex); list_for_each_entry(mod, &modules, list) if (!mod->taints) tracepoint_update_probe_range(mod->tracepoints, mod->tracepoints + mod->num_tracepoints); mutex_unlock(&module_mutex); } /* * Returns 0 if current not found. * Returns 1 if current found. */ int module_get_iter_tracepoints(struct tracepoint_iter *iter) { struct module *iter_mod; int found = 0; mutex_lock(&module_mutex); list_for_each_entry(iter_mod, &modules, list) { if (!iter_mod->taints) { /* * Sorted module list */ if (iter_mod < iter->module) continue; else if (iter_mod > iter->module) iter->tracepoint = NULL; found = tracepoint_get_iter_range(&iter->tracepoint, iter_mod->tracepoints, iter_mod->tracepoints + iter_mod->num_tracepoints); if (found) { iter->module = iter_mod; break; } } } mutex_unlock(&module_mutex); return found; } #endif |