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kernel/module.c
74.4 KB
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/* |
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Copyright (C) 2002 Richard Henderson Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM. 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> #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 <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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#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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/* List of modules, protected by module_mutex or preempt_disable |
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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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/* 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 */ |
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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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/* 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. */ static unsigned int find_sec(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, const char *secstrings, const char *name) { unsigned int i; for (i = 1; i < hdr->e_shnum; i++) /* Alloc bit cleared means "ignore it." */ if ((sechdrs[i].sh_flags & SHF_ALLOC) && strcmp(secstrings+sechdrs[i].sh_name, name) == 0) return i; return 0; } |
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/* Find a module section, or NULL. */ static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs, const char *secstrings, const char *name) { /* Section 0 has sh_addr 0. */ return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr; } /* Find a module section, or NULL. Fill in number of "objects" in section. */ static void *section_objs(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, const char *secstrings, const char *name, size_t object_size, unsigned int *num) { unsigned int sec = find_sec(hdr, sechdrs, secstrings, name); /* Section 0 has sh_addr 0 and sh_size 0. */ *num = sechdrs[sec].sh_size / object_size; return (void *)sechdrs[sec].sh_addr; } |
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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 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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const struct symsearch arr[] = { { __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 * (optional) module which owns it */ |
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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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#ifdef CONFIG_HAVE_DYNAMIC_PER_CPU_AREA static void *percpu_modalloc(unsigned long size, unsigned long align, const char *name) { void *ptr; if (align > PAGE_SIZE) { printk(KERN_WARNING "%s: per-cpu alignment %li > %li ", name, align, PAGE_SIZE); align = PAGE_SIZE; } |
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ptr = __alloc_reserved_percpu(size, align); |
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if (!ptr) printk(KERN_WARNING "Could not allocate %lu bytes percpu data ", size); return ptr; } static void percpu_modfree(void *freeme) { free_percpu(freeme); } #else /* ... !CONFIG_HAVE_DYNAMIC_PER_CPU_AREA */ |
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/* Number of blocks used and allocated. */ static unsigned int pcpu_num_used, pcpu_num_allocated; /* Size of each block. -ve means used. */ static int *pcpu_size; static int split_block(unsigned int i, unsigned short size) { /* Reallocation required? */ if (pcpu_num_used + 1 > pcpu_num_allocated) { |
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int *new; new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2, GFP_KERNEL); |
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if (!new) return 0; |
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pcpu_num_allocated *= 2; |
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pcpu_size = new; } /* Insert a new subblock */ memmove(&pcpu_size[i+1], &pcpu_size[i], sizeof(pcpu_size[0]) * (pcpu_num_used - i)); pcpu_num_used++; pcpu_size[i+1] -= size; pcpu_size[i] = size; return 1; } static inline unsigned int block_size(int val) { if (val < 0) return -val; return val; } |
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static void *percpu_modalloc(unsigned long size, unsigned long align, const char *name) |
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{ unsigned long extra; unsigned int i; void *ptr; |
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if (align > PAGE_SIZE) { printk(KERN_WARNING "%s: per-cpu alignment %li > %li ", name, align, PAGE_SIZE); align = PAGE_SIZE; |
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} |
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ptr = __per_cpu_start; for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { /* Extra for alignment requirement. */ extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr; BUG_ON(i == 0 && extra != 0); if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size) continue; /* Transfer extra to previous block. */ if (pcpu_size[i-1] < 0) pcpu_size[i-1] -= extra; else pcpu_size[i-1] += extra; pcpu_size[i] -= extra; ptr += extra; /* Split block if warranted */ if (pcpu_size[i] - size > sizeof(unsigned long)) if (!split_block(i, size)) return NULL; /* Mark allocated */ pcpu_size[i] = -pcpu_size[i]; return ptr; } printk(KERN_WARNING "Could not allocate %lu bytes percpu data ", size); return NULL; } static void percpu_modfree(void *freeme) { unsigned int i; void *ptr = __per_cpu_start + block_size(pcpu_size[0]); /* First entry is core kernel percpu data. */ for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) { if (ptr == freeme) { pcpu_size[i] = -pcpu_size[i]; goto free; } } BUG(); free: /* Merge with previous? */ if (pcpu_size[i-1] >= 0) { pcpu_size[i-1] += pcpu_size[i]; pcpu_num_used--; memmove(&pcpu_size[i], &pcpu_size[i+1], (pcpu_num_used - i) * sizeof(pcpu_size[0])); i--; } /* Merge with next? */ if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) { pcpu_size[i] += pcpu_size[i+1]; pcpu_num_used--; memmove(&pcpu_size[i+1], &pcpu_size[i+2], (pcpu_num_used - (i+1)) * sizeof(pcpu_size[0])); } } |
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static int percpu_modinit(void) { pcpu_num_used = 2; pcpu_num_allocated = 2; pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated, GFP_KERNEL); /* Static in-kernel percpu data (used). */ |
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pcpu_size[0] = -(__per_cpu_end-__per_cpu_start); |
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/* Free room. */ pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0]; if (pcpu_size[1] < 0) { printk(KERN_ERR "No per-cpu room for modules. "); pcpu_num_used = 1; } return 0; |
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} |
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__initcall(percpu_modinit); |
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#endif /* CONFIG_HAVE_DYNAMIC_PER_CPU_AREA */ |
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static unsigned int find_pcpusec(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, const char *secstrings) { return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); } static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size) { int cpu; for_each_possible_cpu(cpu) memcpy(pcpudest + per_cpu_offset(cpu), from, size); } |
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#else /* ... !CONFIG_SMP */ |
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static inline void *percpu_modalloc(unsigned long size, unsigned long align, const char *name) |
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{ return NULL; } static inline void percpu_modfree(void *pcpuptr) { BUG(); } static inline unsigned int find_pcpusec(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, const char *secstrings) { return 0; } static inline void percpu_modcopy(void *pcpudst, const void *src, unsigned long size) { /* pcpusec should be 0, and size of that section should be 0. */ BUG_ON(size != 0); } |
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#endif /* CONFIG_SMP */ |
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#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) \ { \ |
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570 571 |
kfree(mod->field); \ mod->field = NULL; \ |
c988d2b28
|
572 573 |
} \ static struct module_attribute modinfo_##field = { \ |
7b595756e
|
574 |
.attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b28
|
575 576 577 578 579 580 581 582 |
.show = show_modinfo_##field, \ .setup = setup_modinfo_##field, \ .test = modinfo_##field##_exists, \ .free = free_modinfo_##field, \ }; MODINFO_ATTR(version); MODINFO_ATTR(srcversion); |
e14af7eeb
|
583 |
static char last_unloaded_module[MODULE_NAME_LEN+1]; |
03e88ae1b
|
584 |
#ifdef CONFIG_MODULE_UNLOAD |
1da177e4c
|
585 586 587 |
/* Init the unload section of the module. */ static void module_unload_init(struct module *mod) { |
720eba31f
|
588 |
int cpu; |
1da177e4c
|
589 590 |
INIT_LIST_HEAD(&mod->modules_which_use_me); |
720eba31f
|
591 592 |
for_each_possible_cpu(cpu) local_set(__module_ref_addr(mod, cpu), 0); |
1da177e4c
|
593 |
/* Hold reference count during initialization. */ |
720eba31f
|
594 |
local_set(__module_ref_addr(mod, raw_smp_processor_id()), 1); |
1da177e4c
|
595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 |
/* Backwards compatibility macros put refcount during init. */ mod->waiter = current; } /* modules using other modules */ struct module_use { struct list_head list; struct module *module_which_uses; }; /* Does a already use b? */ static int already_uses(struct module *a, struct module *b) { struct module_use *use; list_for_each_entry(use, &b->modules_which_use_me, list) { if (use->module_which_uses == a) { DEBUGP("%s uses %s! ", a->name, b->name); return 1; } } DEBUGP("%s does not use %s! ", a->name, b->name); return 0; } /* Module a uses b */ |
c6b378019
|
624 |
int use_module(struct module *a, struct module *b) |
1da177e4c
|
625 626 |
{ struct module_use *use; |
c9a3ba55b
|
627 |
int no_warn, err; |
270a6c4ca
|
628 |
|
1da177e4c
|
629 |
if (b == NULL || already_uses(a, b)) return 1; |
c9a3ba55b
|
630 631 632 633 634 635 636 637 638 639 640 641 |
/* If we're interrupted or time out, we fail. */ if (wait_event_interruptible_timeout( module_wq, (err = strong_try_module_get(b)) != -EBUSY, 30 * HZ) <= 0) { printk("%s: gave up waiting for init of module %s. ", a->name, b->name); return 0; } /* If strong_try_module_get() returned a different error, we fail. */ if (err) |
1da177e4c
|
642 643 644 645 646 647 648 649 650 651 652 653 654 655 |
return 0; DEBUGP("Allocating new usage for %s. ", a->name); use = kmalloc(sizeof(*use), GFP_ATOMIC); if (!use) { printk("%s: out of memory loading ", a->name); module_put(b); return 0; } use->module_which_uses = a; list_add(&use->list, &b->modules_which_use_me); |
270a6c4ca
|
656 |
no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name); |
1da177e4c
|
657 658 |
return 1; } |
c6b378019
|
659 |
EXPORT_SYMBOL_GPL(use_module); |
1da177e4c
|
660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 |
/* Clear the unload stuff of the module. */ static void module_unload_free(struct module *mod) { struct module *i; list_for_each_entry(i, &modules, list) { struct module_use *use; list_for_each_entry(use, &i->modules_which_use_me, list) { if (use->module_which_uses == mod) { DEBUGP("%s unusing %s ", mod->name, i->name); module_put(i); list_del(&use->list); kfree(use); |
270a6c4ca
|
676 |
sysfs_remove_link(i->holders_dir, mod->name); |
1da177e4c
|
677 678 679 680 681 682 683 684 |
/* There can be at most one match. */ break; } } } } #ifdef CONFIG_MODULE_FORCE_UNLOAD |
fb1697933
|
685 |
static inline int try_force_unload(unsigned int flags) |
1da177e4c
|
686 687 688 |
{ int ret = (flags & O_TRUNC); if (ret) |
fb1697933
|
689 |
add_taint(TAINT_FORCED_RMMOD); |
1da177e4c
|
690 691 692 |
return ret; } #else |
fb1697933
|
693 |
static inline int try_force_unload(unsigned int flags) |
1da177e4c
|
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 |
{ 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
|
710 711 |
/* If it's not unused, quit unless we're forcing. */ if (module_refcount(sref->mod) != 0) { |
fb1697933
|
712 |
if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4c
|
713 714 715 716 717 718 719 720 721 722 |
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
|
723 724 |
if (flags & O_NONBLOCK) { struct stopref sref = { mod, flags, forced }; |
1da177e4c
|
725 |
|
9b1a4d383
|
726 |
return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e1
|
727 728 729 730 731 732 |
} else { /* We don't need to stop the machine for this. */ mod->state = MODULE_STATE_GOING; synchronize_sched(); return 0; } |
1da177e4c
|
733 734 735 736 |
} unsigned int module_refcount(struct module *mod) { |
720eba31f
|
737 738 |
unsigned int total = 0; int cpu; |
1da177e4c
|
739 |
|
720eba31f
|
740 741 |
for_each_possible_cpu(cpu) total += local_read(__module_ref_addr(mod, cpu)); |
1da177e4c
|
742 743 744 745 746 747 748 749 750 |
return total; } 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
|
751 |
/* Since we might sleep for some time, release the mutex first */ |
6389a3851
|
752 |
mutex_unlock(&module_mutex); |
1da177e4c
|
753 754 755 756 757 758 759 760 761 |
for (;;) { DEBUGP("Looking at refcount... "); set_current_state(TASK_UNINTERRUPTIBLE); if (module_refcount(mod) == 0) break; schedule(); } current->state = TASK_RUNNING; |
6389a3851
|
762 |
mutex_lock(&module_mutex); |
1da177e4c
|
763 |
} |
17da2bd90
|
764 765 |
SYSCALL_DEFINE2(delete_module, const char __user *, name_user, unsigned int, flags) |
1da177e4c
|
766 767 |
{ struct module *mod; |
dfff0a067
|
768 |
char name[MODULE_NAME_LEN]; |
1da177e4c
|
769 |
int ret, forced = 0; |
dfff0a067
|
770 771 772 773 774 775 |
if (!capable(CAP_SYS_MODULE)) return -EPERM; if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) return -EFAULT; name[MODULE_NAME_LEN-1] = '\0'; |
9e01892c4
|
776 777 778 779 780 781 782 783 784 785 |
/* Create stop_machine threads since free_module relies on * a non-failing stop_machine call. */ ret = stop_machine_create(); if (ret) return ret; if (mutex_lock_interruptible(&module_mutex) != 0) { ret = -EINTR; goto out_stop; } |
1da177e4c
|
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 |
mod = find_module(name); if (!mod) { ret = -ENOENT; goto out; } if (!list_empty(&mod->modules_which_use_me)) { /* 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
|
810 |
if (mod->init && !mod->exit) { |
fb1697933
|
811 |
forced = try_force_unload(flags); |
1da177e4c
|
812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 |
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
|
830 |
mutex_unlock(&module_mutex); |
1da177e4c
|
831 |
/* Final destruction now noone is using it. */ |
df4b565e1
|
832 |
if (mod->exit != NULL) |
1da177e4c
|
833 |
mod->exit(); |
df4b565e1
|
834 835 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_GOING, mod); |
22a9d6456
|
836 |
async_synchronize_full(); |
df4b565e1
|
837 |
mutex_lock(&module_mutex); |
e14af7eeb
|
838 |
/* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e3
|
839 |
strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
e9d376f0f
|
840 |
ddebug_remove_module(mod->name); |
1da177e4c
|
841 842 843 |
free_module(mod); out: |
6389a3851
|
844 |
mutex_unlock(&module_mutex); |
9e01892c4
|
845 846 |
out_stop: stop_machine_destroy(); |
1da177e4c
|
847 848 |
return ret; } |
d1e99d7ae
|
849 |
static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4c
|
850 851 852 853 854 855 856 857 858 859 860 861 |
{ 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. */ list_for_each_entry(use, &mod->modules_which_use_me, list) { printed_something = 1; seq_printf(m, "%s,", use->module_which_uses->name); } |
1da177e4c
|
862 863 864 865 866 867 868 869 870 871 872 873 |
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
|
874 |
|
24da1cbff
|
875 |
preempt_disable(); |
414fd31b2
|
876 |
if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4c
|
877 878 |
BUG(); module_put(owner); |
24da1cbff
|
879 |
preempt_enable(); |
1da177e4c
|
880 881 882 883 884 |
} EXPORT_SYMBOL(__symbol_put); void symbol_put_addr(void *addr) { |
5e3766138
|
885 |
struct module *modaddr; |
1da177e4c
|
886 |
|
5e3766138
|
887 888 |
if (core_kernel_text((unsigned long)addr)) return; |
1da177e4c
|
889 |
|
a6e6abd57
|
890 891 892 893 |
/* module_text_address is safe here: we're supposed to have reference * to module from symbol_get, so it can't go away. */ modaddr = __module_text_address((unsigned long)addr); BUG_ON(!modaddr); |
5e3766138
|
894 |
module_put(modaddr); |
1da177e4c
|
895 896 897 898 899 900 |
} EXPORT_SYMBOL_GPL(symbol_put_addr); static ssize_t show_refcnt(struct module_attribute *mattr, struct module *mod, char *buffer) { |
256e2fdf0
|
901 902 |
return sprintf(buffer, "%u ", module_refcount(mod)); |
1da177e4c
|
903 904 905 |
} static struct module_attribute refcnt = { |
7b595756e
|
906 |
.attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4c
|
907 908 |
.show = show_refcnt, }; |
f6a570333
|
909 910 911 912 |
void module_put(struct module *module) { if (module) { unsigned int cpu = get_cpu(); |
720eba31f
|
913 |
local_dec(__module_ref_addr(module, cpu)); |
f6a570333
|
914 915 916 917 918 919 920 |
/* Maybe they're waiting for us to drop reference? */ if (unlikely(!module_is_live(module))) wake_up_process(module->waiter); put_cpu(); } } EXPORT_SYMBOL(module_put); |
1da177e4c
|
921 |
#else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7ae
|
922 |
static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4c
|
923 924 925 926 927 928 929 930 |
{ /* We don't know the usage count, or what modules are using. */ seq_printf(m, " - -"); } static inline void module_unload_free(struct module *mod) { } |
c6b378019
|
931 |
int use_module(struct module *a, struct module *b) |
1da177e4c
|
932 |
{ |
c9a3ba55b
|
933 |
return strong_try_module_get(b) == 0; |
1da177e4c
|
934 |
} |
c6b378019
|
935 |
EXPORT_SYMBOL_GPL(use_module); |
1da177e4c
|
936 937 938 939 940 |
static inline void module_unload_init(struct module *mod) { } #endif /* CONFIG_MODULE_UNLOAD */ |
1f71740ab
|
941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 |
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
|
962 |
.attr = { .name = "initstate", .mode = 0444 }, |
1f71740ab
|
963 964 |
.show = show_initstate, }; |
03e88ae1b
|
965 966 967 |
static struct module_attribute *modinfo_attrs[] = { &modinfo_version, &modinfo_srcversion, |
1f71740ab
|
968 |
&initstate, |
03e88ae1b
|
969 970 971 972 973 |
#ifdef CONFIG_MODULE_UNLOAD &refcnt, #endif NULL, }; |
1da177e4c
|
974 |
static const char vermagic[] = VERMAGIC_STRING; |
c6e665c8f
|
975 |
static int try_to_force_load(struct module *mod, const char *reason) |
826e4506a
|
976 977 |
{ #ifdef CONFIG_MODULE_FORCE_LOAD |
25ddbb18a
|
978 |
if (!test_taint(TAINT_FORCED_MODULE)) |
c6e665c8f
|
979 980 981 |
printk(KERN_WARNING "%s: %s: kernel tainted. ", mod->name, reason); |
826e4506a
|
982 983 984 985 986 987 |
add_taint_module(mod, TAINT_FORCED_MODULE); return 0; #else return -ENOEXEC; #endif } |
1da177e4c
|
988 989 990 991 992 993 994 995 996 997 998 999 1000 |
#ifdef CONFIG_MODVERSIONS static int check_version(Elf_Shdr *sechdrs, unsigned int versindex, const char *symname, struct module *mod, const unsigned long *crc) { 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
|
1001 1002 1003 |
/* No versions at all? modprobe --force does this. */ if (versindex == 0) return try_to_force_load(mod, symname) == 0; |
1da177e4c
|
1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 |
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; if (versions[i].crc == *crc) return 1; |
1da177e4c
|
1014 1015 1016 |
DEBUGP("Found checksum %lX vs module %lX ", *crc, versions[i].crc); |
826e4506a
|
1017 |
goto bad_version; |
1da177e4c
|
1018 |
} |
826e4506a
|
1019 |
|
a5dd69707
|
1020 1021 1022 1023 |
printk(KERN_WARNING "%s: no symbol version for %s ", mod->name, symname); return 0; |
826e4506a
|
1024 1025 1026 1027 1028 1029 |
bad_version: printk("%s: disagrees about version of symbol %s ", mod->name, symname); return 0; |
1da177e4c
|
1030 1031 1032 1033 1034 1035 1036 |
} static inline int check_modstruct_version(Elf_Shdr *sechdrs, unsigned int versindex, struct module *mod) { const unsigned long *crc; |
1da177e4c
|
1037 |
|
8c8ef42ae
|
1038 |
if (!find_symbol("module_layout", NULL, &crc, true, false)) |
1da177e4c
|
1039 |
BUG(); |
8c8ef42ae
|
1040 |
return check_version(sechdrs, versindex, "module_layout", mod, crc); |
1da177e4c
|
1041 |
} |
91e37a793
|
1042 1043 1044 |
/* 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
|
1045 |
{ |
91e37a793
|
1046 1047 1048 1049 |
if (has_crcs) { amagic += strcspn(amagic, " "); bmagic += strcspn(bmagic, " "); } |
1da177e4c
|
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 |
return strcmp(amagic, bmagic) == 0; } #else static inline int check_version(Elf_Shdr *sechdrs, unsigned int versindex, const char *symname, struct module *mod, const unsigned long *crc) { return 1; } static inline int check_modstruct_version(Elf_Shdr *sechdrs, unsigned int versindex, struct module *mod) { return 1; } |
91e37a793
|
1068 1069 |
static inline int same_magic(const char *amagic, const char *bmagic, bool has_crcs) |
1da177e4c
|
1070 1071 1072 1073 1074 1075 1076 |
{ return strcmp(amagic, bmagic) == 0; } #endif /* CONFIG_MODVERSIONS */ /* Resolve a symbol for this module. I.e. if we find one, record usage. Must be holding module_mutex. */ |
414fd31b2
|
1077 1078 1079 1080 |
static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs, unsigned int versindex, const char *name, struct module *mod) |
1da177e4c
|
1081 1082 |
{ struct module *owner; |
414fd31b2
|
1083 |
const struct kernel_symbol *sym; |
1da177e4c
|
1084 |
const unsigned long *crc; |
414fd31b2
|
1085 |
sym = find_symbol(name, &owner, &crc, |
25ddbb18a
|
1086 |
!(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
414fd31b2
|
1087 1088 1089 |
/* use_module can fail due to OOM, or module initialization or unloading */ if (sym) { |
1da177e4c
|
1090 1091 |
if (!check_version(sechdrs, versindex, name, mod, crc) || !use_module(mod, owner)) |
414fd31b2
|
1092 |
sym = NULL; |
1da177e4c
|
1093 |
} |
414fd31b2
|
1094 |
return sym; |
1da177e4c
|
1095 |
} |
1da177e4c
|
1096 1097 1098 1099 |
/* * /sys/module/foo/sections stuff * J. Corbet <corbet@lwn.net> */ |
120fc3d77
|
1100 |
#if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
a58730c42
|
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 |
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
|
1114 1115 1116 1117 1118 1119 1120 1121 |
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
|
1122 1123 |
static void free_sect_attrs(struct module_sect_attrs *sect_attrs) { |
a58730c42
|
1124 |
unsigned int section; |
04b1db9fd
|
1125 1126 1127 1128 1129 |
for (section = 0; section < sect_attrs->nsections; section++) kfree(sect_attrs->attrs[section].name); kfree(sect_attrs); } |
1da177e4c
|
1130 1131 1132 1133 1134 1135 1136 |
static void add_sect_attrs(struct module *mod, unsigned int nsect, char *secstrings, Elf_Shdr *sechdrs) { unsigned int nloaded = 0, i, size[2]; struct module_sect_attrs *sect_attrs; struct module_sect_attr *sattr; struct attribute **gattr; |
22a8bdeb5
|
1137 |
|
1da177e4c
|
1138 1139 1140 1141 1142 1143 1144 1145 |
/* Count loaded sections and allocate structures */ for (i = 0; i < nsect; i++) if (sechdrs[i].sh_flags & SHF_ALLOC) 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
|
1146 1147 |
sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); if (sect_attrs == NULL) |
1da177e4c
|
1148 1149 1150 1151 1152 |
return; /* Setup section attributes. */ sect_attrs->grp.name = "sections"; sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; |
04b1db9fd
|
1153 |
sect_attrs->nsections = 0; |
1da177e4c
|
1154 1155 1156 1157 1158 1159 |
sattr = §_attrs->attrs[0]; gattr = §_attrs->grp.attrs[0]; for (i = 0; i < nsect; i++) { if (! (sechdrs[i].sh_flags & SHF_ALLOC)) continue; sattr->address = sechdrs[i].sh_addr; |
04b1db9fd
|
1160 1161 1162 1163 1164 |
sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, GFP_KERNEL); if (sattr->name == NULL) goto out; sect_attrs->nsections++; |
1da177e4c
|
1165 1166 1167 |
sattr->mattr.show = module_sect_show; sattr->mattr.store = NULL; sattr->mattr.attr.name = sattr->name; |
1da177e4c
|
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 |
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
|
1179 |
free_sect_attrs(sect_attrs); |
1da177e4c
|
1180 1181 1182 1183 1184 1185 1186 1187 1188 |
} 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
|
1189 |
free_sect_attrs(mod->sect_attrs); |
1da177e4c
|
1190 1191 1192 |
mod->sect_attrs = NULL; } } |
6d7601338
|
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 |
/* * /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]; }; static ssize_t module_notes_read(struct kobject *kobj, 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
|
1221 |
kobject_put(notes_attrs->dir); |
6d7601338
|
1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 |
} kfree(notes_attrs); } static void add_notes_attrs(struct module *mod, unsigned int nsect, char *secstrings, Elf_Shdr *sechdrs) { unsigned int notes, loaded, i; struct module_notes_attrs *notes_attrs; struct bin_attribute *nattr; /* Count notes sections and allocate structures. */ notes = 0; for (i = 0; i < nsect; i++) if ((sechdrs[i].sh_flags & SHF_ALLOC) && (sechdrs[i].sh_type == SHT_NOTE)) ++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]; for (loaded = i = 0; i < nsect; ++i) { if (!(sechdrs[i].sh_flags & SHF_ALLOC)) continue; if (sechdrs[i].sh_type == SHT_NOTE) { nattr->attr.name = mod->sect_attrs->attrs[loaded].name; nattr->attr.mode = S_IRUGO; nattr->size = sechdrs[i].sh_size; nattr->private = (void *) sechdrs[i].sh_addr; nattr->read = module_notes_read; ++nattr; } ++loaded; } |
4ff6abff8
|
1264 |
notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d7601338
|
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 |
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
|
1285 |
#else |
04b1db9fd
|
1286 |
|
1da177e4c
|
1287 1288 1289 1290 1291 1292 1293 1294 |
static inline void add_sect_attrs(struct module *mod, unsigned int nsect, char *sectstrings, Elf_Shdr *sechdrs) { } static inline void remove_sect_attrs(struct module *mod) { } |
6d7601338
|
1295 1296 1297 1298 1299 1300 1301 1302 1303 |
static inline void add_notes_attrs(struct module *mod, unsigned int nsect, char *sectstrings, Elf_Shdr *sechdrs) { } static inline void remove_notes_attrs(struct module *mod) { } |
120fc3d77
|
1304 |
#endif |
1da177e4c
|
1305 |
|
ef665c1a0
|
1306 1307 |
#ifdef CONFIG_SYSFS int module_add_modinfo_attrs(struct module *mod) |
c988d2b28
|
1308 1309 |
{ struct module_attribute *attr; |
03e88ae1b
|
1310 |
struct module_attribute *temp_attr; |
c988d2b28
|
1311 1312 |
int error = 0; int i; |
03e88ae1b
|
1313 1314 1315 1316 1317 1318 1319 |
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
|
1320 1321 |
for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { if (!attr->test || |
03e88ae1b
|
1322 1323 |
(attr->test && attr->test(mod))) { memcpy(temp_attr, attr, sizeof(*temp_attr)); |
03e88ae1b
|
1324 1325 1326 |
error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); ++temp_attr; } |
c988d2b28
|
1327 1328 1329 |
} return error; } |
ef665c1a0
|
1330 |
void module_remove_modinfo_attrs(struct module *mod) |
c988d2b28
|
1331 1332 1333 |
{ struct module_attribute *attr; int i; |
03e88ae1b
|
1334 1335 1336 1337 |
for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { /* pick a field to test for end of list */ if (!attr->attr.name) break; |
c988d2b28
|
1338 |
sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1b
|
1339 1340 |
if (attr->free) attr->free(mod); |
c988d2b28
|
1341 |
} |
03e88ae1b
|
1342 |
kfree(mod->modinfo_attrs); |
c988d2b28
|
1343 |
} |
1da177e4c
|
1344 |
|
ef665c1a0
|
1345 |
int mod_sysfs_init(struct module *mod) |
1da177e4c
|
1346 1347 |
{ int err; |
6494a93d5
|
1348 |
struct kobject *kobj; |
1da177e4c
|
1349 |
|
823bccfc4
|
1350 1351 1352 |
if (!module_sysfs_initialized) { printk(KERN_ERR "%s: module sysfs not initialized ", |
1cc5f7142
|
1353 1354 1355 1356 |
mod->name); err = -EINVAL; goto out; } |
6494a93d5
|
1357 1358 1359 1360 1361 1362 1363 1364 1365 |
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
|
1366 |
mod->mkobj.mod = mod; |
e17e0f51a
|
1367 |
|
ac3c8141f
|
1368 1369 1370 1371 1372 1373 |
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
|
1374 |
|
97c146ef0
|
1375 |
/* delay uevent until full sysfs population */ |
270a6c4ca
|
1376 1377 1378 |
out: return err; } |
ef665c1a0
|
1379 |
int mod_sysfs_setup(struct module *mod, |
270a6c4ca
|
1380 1381 1382 1383 |
struct kernel_param *kparam, unsigned int num_params) { int err; |
4ff6abff8
|
1384 |
mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e18
|
1385 1386 |
if (!mod->holders_dir) { err = -ENOMEM; |
270a6c4ca
|
1387 |
goto out_unreg; |
240936e18
|
1388 |
} |
270a6c4ca
|
1389 |
|
1da177e4c
|
1390 1391 |
err = module_param_sysfs_setup(mod, kparam, num_params); if (err) |
270a6c4ca
|
1392 |
goto out_unreg_holders; |
1da177e4c
|
1393 |
|
c988d2b28
|
1394 1395 |
err = module_add_modinfo_attrs(mod); if (err) |
e17e0f51a
|
1396 |
goto out_unreg_param; |
c988d2b28
|
1397 |
|
e17e0f51a
|
1398 |
kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4c
|
1399 |
return 0; |
e17e0f51a
|
1400 1401 |
out_unreg_param: module_param_sysfs_remove(mod); |
270a6c4ca
|
1402 |
out_unreg_holders: |
78a2d906b
|
1403 |
kobject_put(mod->holders_dir); |
270a6c4ca
|
1404 |
out_unreg: |
e17e0f51a
|
1405 |
kobject_put(&mod->mkobj.kobj); |
1da177e4c
|
1406 1407 |
return err; } |
34e4e2fef
|
1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 |
static void mod_sysfs_fini(struct module *mod) { kobject_put(&mod->mkobj.kobj); } #else /* CONFIG_SYSFS */ static void mod_sysfs_fini(struct module *mod) { } #endif /* CONFIG_SYSFS */ |
1da177e4c
|
1421 1422 1423 |
static void mod_kobject_remove(struct module *mod) { |
c988d2b28
|
1424 |
module_remove_modinfo_attrs(mod); |
1da177e4c
|
1425 |
module_param_sysfs_remove(mod); |
78a2d906b
|
1426 1427 |
kobject_put(mod->mkobj.drivers_dir); kobject_put(mod->holders_dir); |
34e4e2fef
|
1428 |
mod_sysfs_fini(mod); |
1da177e4c
|
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 |
} /* * 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); return 0; } |
02a3e59a0
|
1441 |
/* Free a module, remove from lists, etc (must hold module_mutex). */ |
1da177e4c
|
1442 1443 1444 |
static void free_module(struct module *mod) { /* Delete from various lists */ |
9b1a4d383
|
1445 |
stop_machine(__unlink_module, mod, NULL); |
6d7601338
|
1446 |
remove_notes_attrs(mod); |
1da177e4c
|
1447 1448 1449 1450 1451 1452 1453 1454 |
remove_sect_attrs(mod); mod_kobject_remove(mod); /* Arch-specific cleanup. */ module_arch_cleanup(mod); /* Module unload stuff */ module_unload_free(mod); |
e180a6b77
|
1455 1456 |
/* Free any allocated parameters. */ destroy_params(mod->kp, mod->num_kp); |
fed1939c6
|
1457 1458 |
/* release any pointers to mcount in this module */ ftrace_release(mod->module_core, mod->core_size); |
1da177e4c
|
1459 1460 1461 1462 1463 |
/* This may be NULL, but that's OK */ module_free(mod, mod->module_init); kfree(mod->args); if (mod->percpu) percpu_modfree(mod->percpu); |
720eba31f
|
1464 1465 1466 1467 |
#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) if (mod->refptr) percpu_modfree(mod->refptr); #endif |
fbb9ce953
|
1468 1469 |
/* Free lock-classes: */ lockdep_free_key_range(mod->module_core, mod->core_size); |
1da177e4c
|
1470 1471 1472 1473 1474 1475 1476 |
/* Finally, free the core (containing the module structure) */ module_free(mod, mod->module_core); } void *__symbol_get(const char *symbol) { struct module *owner; |
414fd31b2
|
1477 |
const struct kernel_symbol *sym; |
1da177e4c
|
1478 |
|
24da1cbff
|
1479 |
preempt_disable(); |
414fd31b2
|
1480 1481 1482 |
sym = find_symbol(symbol, &owner, NULL, true, true); if (sym && strong_try_module_get(owner)) sym = NULL; |
24da1cbff
|
1483 |
preempt_enable(); |
1da177e4c
|
1484 |
|
414fd31b2
|
1485 |
return sym ? (void *)sym->value : NULL; |
1da177e4c
|
1486 1487 |
} EXPORT_SYMBOL_GPL(__symbol_get); |
eea8b54dc
|
1488 1489 |
/* * Ensure that an exported symbol [global namespace] does not already exist |
02a3e59a0
|
1490 |
* in the kernel or in some other module's exported symbol table. |
eea8b54dc
|
1491 1492 1493 |
*/ static int verify_export_symbols(struct module *mod) { |
b211104d1
|
1494 |
unsigned int i; |
eea8b54dc
|
1495 |
struct module *owner; |
b211104d1
|
1496 1497 1498 1499 1500 1501 1502 1503 |
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
|
1504 |
#ifdef CONFIG_UNUSED_SYMBOLS |
b211104d1
|
1505 1506 |
{ mod->unused_syms, mod->num_unused_syms }, { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, |
f7f5b6755
|
1507 |
#endif |
b211104d1
|
1508 |
}; |
eea8b54dc
|
1509 |
|
b211104d1
|
1510 1511 |
for (i = 0; i < ARRAY_SIZE(arr); i++) { for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { |
414fd31b2
|
1512 |
if (find_symbol(s->name, &owner, NULL, true, false)) { |
b211104d1
|
1513 1514 1515 1516 1517 1518 1519 |
printk(KERN_ERR "%s: exports duplicate symbol %s" " (owned by %s) ", mod->name, s->name, module_name(owner)); return -ENOEXEC; } |
eea8b54dc
|
1520 |
} |
b211104d1
|
1521 1522 |
} return 0; |
eea8b54dc
|
1523 |
} |
9a4b9708f
|
1524 |
/* Change all symbols so that st_value encodes the pointer directly. */ |
1da177e4c
|
1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 |
static int simplify_symbols(Elf_Shdr *sechdrs, unsigned int symindex, const char *strtab, unsigned int versindex, unsigned int pcpuindex, struct module *mod) { Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; unsigned long secbase; unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); int ret = 0; |
414fd31b2
|
1536 |
const struct kernel_symbol *ksym; |
1da177e4c
|
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 |
for (i = 1; i < n; i++) { switch (sym[i].st_shndx) { case SHN_COMMON: /* We compiled with -fno-common. These are not supposed to happen. */ DEBUGP("Common symbol: %s ", strtab + sym[i].st_name); 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: |
414fd31b2
|
1559 1560 |
ksym = resolve_symbol(sechdrs, versindex, strtab + sym[i].st_name, mod); |
1da177e4c
|
1561 |
/* Ok if resolved. */ |
414fd31b2
|
1562 1563 |
if (ksym) { sym[i].st_value = ksym->value; |
1da177e4c
|
1564 |
break; |
414fd31b2
|
1565 |
} |
1da177e4c
|
1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 |
/* Ok if weak. */ if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) break; printk(KERN_WARNING "%s: Unknown symbol %s ", mod->name, strtab + sym[i].st_name); ret = -ENOENT; break; default: /* Divert to percpu allocation if a percpu var. */ if (sym[i].st_shndx == pcpuindex) secbase = (unsigned long)mod->percpu; else secbase = sechdrs[sym[i].st_shndx].sh_addr; sym[i].st_value += secbase; break; } } return ret; } |
088af9a6e
|
1589 1590 1591 1592 1593 1594 1595 |
/* 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
|
1596 |
/* Update size with this section: return offset. */ |
088af9a6e
|
1597 1598 |
static long get_offset(struct module *mod, unsigned int *size, Elf_Shdr *sechdr, unsigned int section) |
1da177e4c
|
1599 1600 |
{ long ret; |
088af9a6e
|
1601 |
*size += arch_mod_section_prepend(mod, section); |
1da177e4c
|
1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 |
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. */ static void layout_sections(struct module *mod, const Elf_Ehdr *hdr, Elf_Shdr *sechdrs, const char *secstrings) { 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; for (i = 0; i < hdr->e_shnum; i++) sechdrs[i].sh_entsize = ~0UL; DEBUGP("Core section allocation order: "); for (m = 0; m < ARRAY_SIZE(masks); ++m) { for (i = 0; i < hdr->e_shnum; ++i) { Elf_Shdr *s = &sechdrs[i]; if ((s->sh_flags & masks[m][0]) != masks[m][0] || (s->sh_flags & masks[m][1]) || s->sh_entsize != ~0UL |
49502677e
|
1639 |
|| strstarts(secstrings + s->sh_name, ".init")) |
1da177e4c
|
1640 |
continue; |
088af9a6e
|
1641 |
s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
1da177e4c
|
1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 |
DEBUGP("\t%s ", secstrings + s->sh_name); } if (m == 0) mod->core_text_size = mod->core_size; } DEBUGP("Init section allocation order: "); for (m = 0; m < ARRAY_SIZE(masks); ++m) { for (i = 0; i < hdr->e_shnum; ++i) { Elf_Shdr *s = &sechdrs[i]; if ((s->sh_flags & masks[m][0]) != masks[m][0] || (s->sh_flags & masks[m][1]) || s->sh_entsize != ~0UL |
49502677e
|
1658 |
|| !strstarts(secstrings + s->sh_name, ".init")) |
1da177e4c
|
1659 |
continue; |
088af9a6e
|
1660 |
s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4c
|
1661 1662 1663 1664 1665 1666 1667 1668 |
| INIT_OFFSET_MASK); DEBUGP("\t%s ", secstrings + s->sh_name); } if (m == 0) mod->init_text_size = mod->init_size; } } |
1da177e4c
|
1669 1670 1671 1672 |
static void set_license(struct module *mod, const char *license) { if (!license) license = "unspecified"; |
fa3ba2e81
|
1673 |
if (!license_is_gpl_compatible(license)) { |
25ddbb18a
|
1674 |
if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d26276
|
1675 |
printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e81
|
1676 1677 1678 |
"kernel. ", mod->name, license); add_taint_module(mod, TAINT_PROPRIETARY_MODULE); |
1da177e4c
|
1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 |
} } /* 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; } static char *get_modinfo(Elf_Shdr *sechdrs, unsigned int info, const char *tag) { char *p; unsigned int taglen = strlen(tag); unsigned long size = sechdrs[info].sh_size; for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) { if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') return p + taglen + 1; } return NULL; } |
c988d2b28
|
1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 |
static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs, unsigned int infoindex) { struct module_attribute *attr; int i; for (i = 0; (attr = modinfo_attrs[i]); i++) { if (attr->setup) attr->setup(mod, get_modinfo(sechdrs, infoindex, attr->attr.name)); } } |
c988d2b28
|
1729 |
|
1da177e4c
|
1730 |
#ifdef CONFIG_KALLSYMS |
15bba37d6
|
1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 |
/* 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
|
1743 1744 |
static int is_exported(const char *name, unsigned long value, const struct module *mod) |
1da177e4c
|
1745 |
{ |
ca4787b77
|
1746 1747 1748 |
const struct kernel_symbol *ks; if (!mod) ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f4
|
1749 |
else |
ca4787b77
|
1750 1751 |
ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); return ks != NULL && ks->value == value; |
1da177e4c
|
1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 |
} /* As per nm */ static char elf_type(const Elf_Sym *sym, Elf_Shdr *sechdrs, const char *secstrings, struct module *mod) { 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'; } |
49502677e
|
1789 |
if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug")) |
1da177e4c
|
1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 |
return 'n'; return '?'; } static void add_kallsyms(struct module *mod, Elf_Shdr *sechdrs, unsigned int symindex, unsigned int strindex, const char *secstrings) { unsigned int i; mod->symtab = (void *)sechdrs[symindex].sh_addr; mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym); mod->strtab = (void *)sechdrs[strindex].sh_addr; /* Set types up while we still have access to sections. */ for (i = 0; i < mod->num_symtab; i++) mod->symtab[i].st_info = elf_type(&mod->symtab[i], sechdrs, secstrings, mod); } #else static inline void add_kallsyms(struct module *mod, Elf_Shdr *sechdrs, unsigned int symindex, unsigned int strindex, const char *secstrings) { } #endif /* CONFIG_KALLSYMS */ |
e9d376f0f
|
1820 |
static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15beb
|
1821 |
{ |
e9d376f0f
|
1822 1823 1824 1825 1826 1827 |
#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
|
1828 |
} |
346e15beb
|
1829 |
|
3a642e99b
|
1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 |
static void *module_alloc_update_bounds(unsigned long size) { void *ret = module_alloc(size); if (ret) { /* 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; } return ret; } |
1da177e4c
|
1843 1844 |
/* Allocate and load the module: note that size of section 0 is always zero, and we rely on this for optional sections. */ |
ffb4ba76a
|
1845 |
static noinline struct module *load_module(void __user *umod, |
1da177e4c
|
1846 1847 1848 1849 1850 1851 |
unsigned long len, const char __user *uargs) { Elf_Ehdr *hdr; Elf_Shdr *sechdrs; char *secstrings, *args, *modmagic, *strtab = NULL; |
061b1bd39
|
1852 |
char *staging; |
84860f997
|
1853 1854 1855 |
unsigned int i; unsigned int symindex = 0; unsigned int strindex = 0; |
5e458cc0f
|
1856 |
unsigned int modindex, versindex, infoindex, pcpuindex; |
e180a6b77
|
1857 |
unsigned int num_mcount; |
1da177e4c
|
1858 1859 1860 |
struct module *mod; long err = 0; void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ |
5e458cc0f
|
1861 |
unsigned long *mseg; |
378bac820
|
1862 |
mm_segment_t old_fs; |
1da177e4c
|
1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 |
DEBUGP("load_module: umod=%p, len=%lu, uargs=%p ", umod, len, uargs); if (len < sizeof(*hdr)) return ERR_PTR(-ENOEXEC); /* Suck in entire file: we'll want most of it. */ /* vmalloc barfs on "unusual" numbers. Check here */ if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL) return ERR_PTR(-ENOMEM); |
9e01892c4
|
1874 |
|
1da177e4c
|
1875 1876 1877 1878 1879 1880 1881 |
if (copy_from_user(hdr, umod, len) != 0) { err = -EFAULT; goto free_hdr; } /* Sanity checks against insmoding binaries or wrong arch, weird elf version */ |
c4ea6fcf5
|
1882 |
if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 |
1da177e4c
|
1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 |
|| hdr->e_type != ET_REL || !elf_check_arch(hdr) || hdr->e_shentsize != sizeof(*sechdrs)) { err = -ENOEXEC; goto free_hdr; } if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) goto truncated; /* Convenience variables */ sechdrs = (void *)hdr + hdr->e_shoff; secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; sechdrs[0].sh_addr = 0; for (i = 1; i < hdr->e_shnum; i++) { if (sechdrs[i].sh_type != SHT_NOBITS && len < sechdrs[i].sh_offset + sechdrs[i].sh_size) goto truncated; /* Mark all sections sh_addr with their address in the temporary image. */ sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset; /* Internal symbols and strings. */ if (sechdrs[i].sh_type == SHT_SYMTAB) { symindex = i; strindex = sechdrs[i].sh_link; strtab = (char *)hdr + sechdrs[strindex].sh_offset; } #ifndef CONFIG_MODULE_UNLOAD /* Don't load .exit sections */ |
49502677e
|
1915 |
if (strstarts(secstrings+sechdrs[i].sh_name, ".exit")) |
1da177e4c
|
1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 |
sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC; #endif } modindex = find_sec(hdr, sechdrs, secstrings, ".gnu.linkonce.this_module"); if (!modindex) { printk(KERN_WARNING "No module found in object "); err = -ENOEXEC; goto free_hdr; } |
5e458cc0f
|
1928 |
/* This is temporary: point mod into copy of data. */ |
1da177e4c
|
1929 1930 1931 1932 1933 1934 1935 1936 1937 |
mod = (void *)sechdrs[modindex].sh_addr; if (symindex == 0) { printk(KERN_WARNING "%s: module has no symbols (stripped?) ", mod->name); err = -ENOEXEC; goto free_hdr; } |
1da177e4c
|
1938 1939 1940 |
versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); |
ea01e798e
|
1941 |
/* Don't keep modinfo and version sections. */ |
1da177e4c
|
1942 |
sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
ea01e798e
|
1943 |
sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4c
|
1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 |
#ifdef CONFIG_KALLSYMS /* Keep symbol and string tables for decoding later. */ sechdrs[symindex].sh_flags |= SHF_ALLOC; sechdrs[strindex].sh_flags |= SHF_ALLOC; #endif /* Check module struct version now, before we try to use module. */ if (!check_modstruct_version(sechdrs, versindex, mod)) { err = -ENOEXEC; goto free_hdr; } modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); /* This is allowed: modprobe --force will invalidate it. */ if (!modmagic) { |
c6e665c8f
|
1959 |
err = try_to_force_load(mod, "bad vermagic"); |
826e4506a
|
1960 1961 |
if (err) goto free_hdr; |
91e37a793
|
1962 |
} else if (!same_magic(modmagic, vermagic, versindex)) { |
1da177e4c
|
1963 1964 1965 1966 1967 1968 |
printk(KERN_ERR "%s: version magic '%s' should be '%s' ", mod->name, modmagic, vermagic); err = -ENOEXEC; goto free_hdr; } |
061b1bd39
|
1969 1970 1971 1972 1973 1974 1975 1976 |
staging = get_modinfo(sechdrs, infoindex, "staging"); if (staging) { 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); } |
1da177e4c
|
1977 |
/* Now copy in args */ |
24277dda3
|
1978 1979 1980 |
args = strndup_user(uargs, ~0UL >> 1); if (IS_ERR(args)) { err = PTR_ERR(args); |
1da177e4c
|
1981 1982 |
goto free_hdr; } |
8e08b7568
|
1983 |
|
1da177e4c
|
1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 |
if (find_module(mod->name)) { err = -EEXIST; goto free_mod; } mod->state = MODULE_STATE_COMING; /* Allow arches to frob section contents and sizes. */ err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod); if (err < 0) goto free_mod; if (pcpuindex) { /* We have a special allocation for this section. */ percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size, |
842bbaaa7
|
1999 2000 |
sechdrs[pcpuindex].sh_addralign, mod->name); |
1da177e4c
|
2001 2002 |
if (!percpu) { err = -ENOMEM; |
6e2b75740
|
2003 |
goto free_mod; |
1da177e4c
|
2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 |
} sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC; mod->percpu = percpu; } /* 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. */ layout_sections(mod, hdr, sechdrs, secstrings); /* Do the allocs. */ |
3a642e99b
|
2015 |
ptr = module_alloc_update_bounds(mod->core_size); |
1da177e4c
|
2016 2017 2018 2019 2020 2021 |
if (!ptr) { err = -ENOMEM; goto free_percpu; } memset(ptr, 0, mod->core_size); mod->module_core = ptr; |
3a642e99b
|
2022 |
ptr = module_alloc_update_bounds(mod->init_size); |
1da177e4c
|
2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 |
if (!ptr && mod->init_size) { err = -ENOMEM; goto free_core; } memset(ptr, 0, mod->init_size); mod->module_init = ptr; /* Transfer each section which specifies SHF_ALLOC */ DEBUGP("final section addresses: "); for (i = 0; i < hdr->e_shnum; i++) { void *dest; if (!(sechdrs[i].sh_flags & SHF_ALLOC)) continue; if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK) dest = mod->module_init + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK); else dest = mod->module_core + sechdrs[i].sh_entsize; if (sechdrs[i].sh_type != SHT_NOBITS) memcpy(dest, (void *)sechdrs[i].sh_addr, sechdrs[i].sh_size); /* Update sh_addr to point to copy in image. */ sechdrs[i].sh_addr = (unsigned long)dest; DEBUGP("\t0x%lx %s ", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name); } /* Module has been moved. */ mod = (void *)sechdrs[modindex].sh_addr; |
6e2b75740
|
2055 2056 2057 2058 2059 2060 2061 2062 |
#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) mod->refptr = percpu_modalloc(sizeof(local_t), __alignof__(local_t), mod->name); if (!mod->refptr) { err = -ENOMEM; goto free_init; } #endif |
1da177e4c
|
2063 2064 |
/* Now we've moved module, initialize linked lists, etc. */ module_unload_init(mod); |
97c146ef0
|
2065 |
/* add kobject, so we can reference it. */ |
d58ae6781
|
2066 2067 |
err = mod_sysfs_init(mod); if (err) |
97c146ef0
|
2068 |
goto free_unload; |
270a6c4ca
|
2069 |
|
1da177e4c
|
2070 2071 |
/* Set up license info based on the info section */ set_license(mod, get_modinfo(sechdrs, infoindex, "license")); |
9b37ccfc6
|
2072 2073 2074 2075 2076 |
/* * 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. */ |
fa3ba2e81
|
2077 |
if (strcmp(mod->name, "ndiswrapper") == 0) |
9b37ccfc6
|
2078 2079 2080 |
add_taint(TAINT_PROPRIETARY_MODULE); /* driverloader was caught wrongly pretending to be under GPL */ |
fa3ba2e81
|
2081 2082 |
if (strcmp(mod->name, "driverloader") == 0) add_taint_module(mod, TAINT_PROPRIETARY_MODULE); |
9841d61d7
|
2083 |
|
c988d2b28
|
2084 2085 |
/* Set up MODINFO_ATTR fields */ setup_modinfo(mod, sechdrs, infoindex); |
c988d2b28
|
2086 |
|
1da177e4c
|
2087 2088 2089 2090 2091 |
/* Fix up syms, so that st_value is a pointer to location. */ err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex, mod); if (err < 0) goto cleanup; |
5e458cc0f
|
2092 2093 |
/* Now we've got everything in the final locations, we can * find optional sections. */ |
e180a6b77
|
2094 2095 |
mod->kp = section_objs(hdr, sechdrs, secstrings, "__param", sizeof(*mod->kp), &mod->num_kp); |
5e458cc0f
|
2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 |
mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab", sizeof(*mod->syms), &mod->num_syms); mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab"); mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl", sizeof(*mod->gpl_syms), &mod->num_gpl_syms); mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl"); mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl_future", sizeof(*mod->gpl_future_syms), &mod->num_gpl_future_syms); mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl_future"); |
1da177e4c
|
2109 |
|
f7f5b6755
|
2110 |
#ifdef CONFIG_UNUSED_SYMBOLS |
5e458cc0f
|
2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 |
mod->unused_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_unused", sizeof(*mod->unused_syms), &mod->num_unused_syms); mod->unused_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_unused"); mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl", sizeof(*mod->unused_gpl_syms), &mod->num_unused_gpl_syms); mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl"); #endif #ifdef CONFIG_MARKERS mod->markers = section_objs(hdr, sechdrs, secstrings, "__markers", sizeof(*mod->markers), &mod->num_markers); #endif #ifdef CONFIG_TRACEPOINTS mod->tracepoints = section_objs(hdr, sechdrs, secstrings, "__tracepoints", sizeof(*mod->tracepoints), &mod->num_tracepoints); |
f7f5b6755
|
2134 |
#endif |
f71d20e96
|
2135 |
|
1da177e4c
|
2136 |
#ifdef CONFIG_MODVERSIONS |
5e458cc0f
|
2137 2138 2139 |
if ((mod->num_syms && !mod->crcs) || (mod->num_gpl_syms && !mod->gpl_crcs) || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) |
f7f5b6755
|
2140 |
#ifdef CONFIG_UNUSED_SYMBOLS |
5e458cc0f
|
2141 2142 |
|| (mod->num_unused_syms && !mod->unused_crcs) || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) |
f7f5b6755
|
2143 2144 |
#endif ) { |
c6e665c8f
|
2145 2146 |
err = try_to_force_load(mod, "no versions for exported symbols"); |
826e4506a
|
2147 2148 |
if (err) goto cleanup; |
1da177e4c
|
2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 |
} #endif /* Now do relocations. */ for (i = 1; i < hdr->e_shnum; i++) { const char *strtab = (char *)sechdrs[strindex].sh_addr; unsigned int info = sechdrs[i].sh_info; /* Not a valid relocation section? */ if (info >= hdr->e_shnum) continue; /* Don't bother with non-allocated sections */ if (!(sechdrs[info].sh_flags & SHF_ALLOC)) continue; if (sechdrs[i].sh_type == SHT_REL) err = apply_relocate(sechdrs, strtab, symindex, i,mod); else if (sechdrs[i].sh_type == SHT_RELA) err = apply_relocate_add(sechdrs, strtab, symindex, i, mod); if (err < 0) goto cleanup; } |
eea8b54dc
|
2173 2174 |
/* Find duplicate symbols */ err = verify_export_symbols(mod); |
eea8b54dc
|
2175 2176 |
if (err < 0) goto cleanup; |
1da177e4c
|
2177 |
/* Set up and sort exception table */ |
5e458cc0f
|
2178 2179 2180 |
mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table", sizeof(*mod->extable), &mod->num_exentries); sort_extable(mod->extable, mod->extable + mod->num_exentries); |
1da177e4c
|
2181 2182 2183 2184 2185 2186 |
/* Finally, copy percpu area over. */ percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr, sechdrs[pcpuindex].sh_size); add_kallsyms(mod, sechdrs, symindex, strindex, secstrings); |
97e1c18e8
|
2187 |
if (!mod->taints) { |
e9d376f0f
|
2188 |
struct _ddebug *debug; |
5e458cc0f
|
2189 |
unsigned int num_debug; |
5e458cc0f
|
2190 2191 |
debug = section_objs(hdr, sechdrs, secstrings, "__verbose", sizeof(*debug), &num_debug); |
e9d376f0f
|
2192 2193 |
if (debug) dynamic_debug_setup(debug, num_debug); |
97e1c18e8
|
2194 |
} |
90d595fe5
|
2195 |
|
fed1939c6
|
2196 |
/* sechdrs[0].sh_size is always zero */ |
5e458cc0f
|
2197 2198 |
mseg = section_objs(hdr, sechdrs, secstrings, "__mcount_loc", sizeof(*mseg), &num_mcount); |
31e889098
|
2199 |
ftrace_init_module(mod, mseg, mseg + num_mcount); |
90d595fe5
|
2200 |
|
1da177e4c
|
2201 2202 2203 |
err = module_finalize(hdr, sechdrs, mod); if (err < 0) goto cleanup; |
378bac820
|
2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 |
/* 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); |
1da177e4c
|
2221 |
mod->args = args; |
5e458cc0f
|
2222 |
if (section_addr(hdr, sechdrs, secstrings, "__obsparm")) |
8d3b33f67
|
2223 2224 2225 |
printk(KERN_WARNING "%s: Ignoring obsolete parameters ", mod->name); |
bb9d3d56e
|
2226 |
/* Now sew it into the lists so we can get lockdep and oops |
d72b37513
|
2227 2228 2229 2230 2231 2232 2233 |
* 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. */ list_add_rcu(&mod->list, &modules); |
bb9d3d56e
|
2234 |
|
e180a6b77
|
2235 |
err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL); |
1da177e4c
|
2236 |
if (err < 0) |
bb9d3d56e
|
2237 |
goto unlink; |
1da177e4c
|
2238 |
|
e180a6b77
|
2239 |
err = mod_sysfs_setup(mod, mod->kp, mod->num_kp); |
1da177e4c
|
2240 |
if (err < 0) |
bb9d3d56e
|
2241 |
goto unlink; |
1da177e4c
|
2242 |
add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
6d7601338
|
2243 |
add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
1da177e4c
|
2244 2245 2246 2247 2248 2249 |
/* Get rid of temporary copy */ vfree(hdr); /* Done! */ return mod; |
bb9d3d56e
|
2250 |
unlink: |
e91defa26
|
2251 2252 2253 |
/* Unlink carefully: kallsyms could be walking list. */ list_del_rcu(&mod->list); synchronize_sched(); |
1da177e4c
|
2254 2255 |
module_arch_cleanup(mod); cleanup: |
97c146ef0
|
2256 2257 |
kobject_del(&mod->mkobj.kobj); kobject_put(&mod->mkobj.kobj); |
fed1939c6
|
2258 |
ftrace_release(mod->module_core, mod->core_size); |
97c146ef0
|
2259 |
free_unload: |
1da177e4c
|
2260 |
module_unload_free(mod); |
6e2b75740
|
2261 |
#if defined(CONFIG_MODULE_UNLOAD) && defined(CONFIG_SMP) |
b10153fe3
|
2262 |
free_init: |
6e2b75740
|
2263 2264 |
percpu_modfree(mod->refptr); #endif |
1da177e4c
|
2265 2266 2267 |
module_free(mod, mod->module_init); free_core: module_free(mod, mod->module_core); |
6e2b75740
|
2268 |
/* mod will be freed with core. Don't access it beyond this line! */ |
1da177e4c
|
2269 2270 2271 2272 2273 2274 2275 |
free_percpu: if (percpu) percpu_modfree(percpu); free_mod: kfree(args); free_hdr: vfree(hdr); |
6fe2e70bb
|
2276 |
return ERR_PTR(err); |
1da177e4c
|
2277 2278 2279 2280 2281 2282 2283 |
truncated: printk(KERN_ERR "Module len %lu truncated ", len); err = -ENOEXEC; goto free_hdr; } |
1da177e4c
|
2284 |
/* This is where the real work happens */ |
17da2bd90
|
2285 2286 |
SYSCALL_DEFINE3(init_module, void __user *, umod, unsigned long, len, const char __user *, uargs) |
1da177e4c
|
2287 2288 2289 2290 2291 2292 2293 2294 2295 |
{ struct module *mod; int ret = 0; /* Must have permission */ if (!capable(CAP_SYS_MODULE)) return -EPERM; /* Only one module load at a time, please */ |
6389a3851
|
2296 |
if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4c
|
2297 2298 2299 2300 2301 |
return -EINTR; /* Do all the hard work */ mod = load_module(umod, len, uargs); if (IS_ERR(mod)) { |
6389a3851
|
2302 |
mutex_unlock(&module_mutex); |
1da177e4c
|
2303 2304 |
return PTR_ERR(mod); } |
1da177e4c
|
2305 |
/* Drop lock so they can recurse */ |
6389a3851
|
2306 |
mutex_unlock(&module_mutex); |
1da177e4c
|
2307 |
|
e041c6834
|
2308 2309 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_COMING, mod); |
1da177e4c
|
2310 2311 2312 |
/* Start the module */ if (mod->init != NULL) |
59f9415ff
|
2313 |
ret = do_one_initcall(mod->init); |
1da177e4c
|
2314 2315 2316 2317 |
if (ret < 0) { /* Init routine failed: abort. Try to protect us from buggy refcounters. */ mod->state = MODULE_STATE_GOING; |
fbd568a3e
|
2318 |
synchronize_sched(); |
af49d9248
|
2319 |
module_put(mod); |
df4b565e1
|
2320 2321 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_GOING, mod); |
af49d9248
|
2322 2323 2324 |
mutex_lock(&module_mutex); free_module(mod); mutex_unlock(&module_mutex); |
c9a3ba55b
|
2325 |
wake_up(&module_wq); |
1da177e4c
|
2326 2327 |
return ret; } |
e24e2e64c
|
2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 |
if (ret > 0) { printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, " "it should follow 0/-E convention " KERN_WARNING "%s: loading module anyway... ", __func__, mod->name, ret, __func__); dump_stack(); } |
1da177e4c
|
2338 |
|
6c5db22d2
|
2339 |
/* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4c
|
2340 |
mod->state = MODULE_STATE_LIVE; |
6c5db22d2
|
2341 |
wake_up(&module_wq); |
0deddf436
|
2342 2343 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_LIVE, mod); |
6c5db22d2
|
2344 |
|
d6de2c80e
|
2345 2346 |
/* We need to finish all async code before the module init sequence is done */ async_synchronize_full(); |
6c5db22d2
|
2347 |
mutex_lock(&module_mutex); |
1da177e4c
|
2348 2349 2350 2351 2352 2353 |
/* Drop initial reference. */ module_put(mod); module_free(mod, mod->module_init); mod->module_init = NULL; mod->init_size = 0; mod->init_text_size = 0; |
6389a3851
|
2354 |
mutex_unlock(&module_mutex); |
1da177e4c
|
2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 |
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 $d. */ static inline int is_arm_mapping_symbol(const char *str) { |
22a8bdeb5
|
2371 |
return str[0] == '$' && strchr("atd", str[1]) |
1da177e4c
|
2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 |
&& (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
|
2384 |
if (within_module_init(addr, mod)) |
1da177e4c
|
2385 |
nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb5
|
2386 |
else |
1da177e4c
|
2387 2388 2389 |
nextval = (unsigned long)mod->module_core+mod->core_text_size; /* Scan for closest preceeding symbol, and next symbol. (ELF |
22a8bdeb5
|
2390 |
starts real symbols at 1). */ |
1da177e4c
|
2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 |
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
|
2411 2412 2413 2414 |
if (size) *size = nextval - mod->symtab[best].st_value; if (offset) *offset = addr - mod->symtab[best].st_value; |
1da177e4c
|
2415 2416 |
return mod->strtab + mod->symtab[best].st_name; } |
6dd06c9fb
|
2417 2418 |
/* For kallsyms to ask for address resolution. NULL means not found. Careful * not to lock to avoid deadlock on oopses, simply disable preemption. */ |
92dfc9dc7
|
2419 |
const char *module_address_lookup(unsigned long addr, |
6dd06c9fb
|
2420 2421 2422 2423 |
unsigned long *size, unsigned long *offset, char **modname, char *namebuf) |
1da177e4c
|
2424 2425 |
{ struct module *mod; |
cb2a52052
|
2426 |
const char *ret = NULL; |
1da177e4c
|
2427 |
|
cb2a52052
|
2428 |
preempt_disable(); |
d72b37513
|
2429 |
list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211e
|
2430 2431 |
if (within_module_init(addr, mod) || within_module_core(addr, mod)) { |
ffc508919
|
2432 2433 |
if (modname) *modname = mod->name; |
cb2a52052
|
2434 2435 |
ret = get_ksymbol(mod, addr, size, offset); break; |
1da177e4c
|
2436 2437 |
} } |
6dd06c9fb
|
2438 2439 2440 2441 2442 |
/* Make a copy in here where it's safe */ if (ret) { strncpy(namebuf, ret, KSYM_NAME_LEN - 1); ret = namebuf; } |
cb2a52052
|
2443 |
preempt_enable(); |
92dfc9dc7
|
2444 |
return ret; |
1da177e4c
|
2445 |
} |
9d65cb4a1
|
2446 2447 2448 |
int lookup_module_symbol_name(unsigned long addr, char *symname) { struct module *mod; |
cb2a52052
|
2449 |
preempt_disable(); |
d72b37513
|
2450 |
list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211e
|
2451 2452 |
if (within_module_init(addr, mod) || within_module_core(addr, mod)) { |
9d65cb4a1
|
2453 2454 2455 2456 2457 |
const char *sym; sym = get_ksymbol(mod, addr, NULL, NULL); if (!sym) goto out; |
9281acea6
|
2458 |
strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a52052
|
2459 |
preempt_enable(); |
9d65cb4a1
|
2460 2461 2462 2463 |
return 0; } } out: |
cb2a52052
|
2464 |
preempt_enable(); |
9d65cb4a1
|
2465 2466 |
return -ERANGE; } |
a5c43dae7
|
2467 2468 2469 2470 |
int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) { struct module *mod; |
cb2a52052
|
2471 |
preempt_disable(); |
d72b37513
|
2472 |
list_for_each_entry_rcu(mod, &modules, list) { |
a06f6211e
|
2473 2474 |
if (within_module_init(addr, mod) || within_module_core(addr, mod)) { |
a5c43dae7
|
2475 2476 2477 2478 2479 2480 |
const char *sym; sym = get_ksymbol(mod, addr, size, offset); if (!sym) goto out; if (modname) |
9281acea6
|
2481 |
strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae7
|
2482 |
if (name) |
9281acea6
|
2483 |
strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a52052
|
2484 |
preempt_enable(); |
a5c43dae7
|
2485 2486 2487 2488 |
return 0; } } out: |
cb2a52052
|
2489 |
preempt_enable(); |
a5c43dae7
|
2490 2491 |
return -ERANGE; } |
ea07890a6
|
2492 2493 |
int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, char *name, char *module_name, int *exported) |
1da177e4c
|
2494 2495 |
{ struct module *mod; |
cb2a52052
|
2496 |
preempt_disable(); |
d72b37513
|
2497 |
list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4c
|
2498 2499 2500 |
if (symnum < mod->num_symtab) { *value = mod->symtab[symnum].st_value; *type = mod->symtab[symnum].st_info; |
098c5eea0
|
2501 |
strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea6
|
2502 2503 |
KSYM_NAME_LEN); strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b77
|
2504 |
*exported = is_exported(name, *value, mod); |
cb2a52052
|
2505 |
preempt_enable(); |
ea07890a6
|
2506 |
return 0; |
1da177e4c
|
2507 2508 2509 |
} symnum -= mod->num_symtab; } |
cb2a52052
|
2510 |
preempt_enable(); |
ea07890a6
|
2511 |
return -ERANGE; |
1da177e4c
|
2512 2513 2514 2515 2516 2517 2518 |
} static unsigned long mod_find_symname(struct module *mod, const char *name) { unsigned int i; for (i = 0; i < mod->num_symtab; i++) |
54e8ce463
|
2519 2520 |
if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && mod->symtab[i].st_info != 'U') |
1da177e4c
|
2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 |
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
|
2533 |
preempt_disable(); |
1da177e4c
|
2534 2535 2536 2537 2538 2539 |
if ((colon = strchr(name, ':')) != NULL) { *colon = '\0'; if ((mod = find_module(name)) != NULL) ret = mod_find_symname(mod, colon+1); *colon = ':'; } else { |
d72b37513
|
2540 |
list_for_each_entry_rcu(mod, &modules, list) |
1da177e4c
|
2541 2542 2543 |
if ((ret = mod_find_symname(mod, name)) != 0) break; } |
cb2a52052
|
2544 |
preempt_enable(); |
1da177e4c
|
2545 2546 |
return ret; } |
75a66614d
|
2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 |
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
|
2566 |
#endif /* CONFIG_KALLSYMS */ |
21aa9280b
|
2567 |
static char *module_flags(struct module *mod, char *buf) |
fa3ba2e81
|
2568 2569 |
{ int bx = 0; |
21aa9280b
|
2570 2571 2572 |
if (mod->taints || mod->state == MODULE_STATE_GOING || mod->state == MODULE_STATE_COMING) { |
fa3ba2e81
|
2573 |
buf[bx++] = '('; |
25ddbb18a
|
2574 |
if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
fa3ba2e81
|
2575 |
buf[bx++] = 'P'; |
25ddbb18a
|
2576 |
if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
fa3ba2e81
|
2577 |
buf[bx++] = 'F'; |
26e9a3977
|
2578 |
if (mod->taints & (1 << TAINT_CRAP)) |
061b1bd39
|
2579 |
buf[bx++] = 'C'; |
fa3ba2e81
|
2580 2581 2582 2583 2584 |
/* * TAINT_FORCED_RMMOD: could be added. * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't * apply to modules. */ |
21aa9280b
|
2585 2586 2587 2588 2589 2590 2591 |
/* 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
|
2592 2593 2594 2595 2596 2597 |
buf[bx++] = ')'; } buf[bx] = '\0'; return buf; } |
3b5d5c6b0
|
2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 |
#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
|
2615 2616 2617 |
static int m_show(struct seq_file *m, void *p) { struct module *mod = list_entry(p, struct module, list); |
fa3ba2e81
|
2618 |
char buf[8]; |
2f0f2a334
|
2619 |
seq_printf(m, "%s %u", |
1da177e4c
|
2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 |
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
|
2630 2631 |
/* Taints info */ if (mod->taints) |
21aa9280b
|
2632 |
seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e81
|
2633 |
|
1da177e4c
|
2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 |
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
|
2644 |
static const struct seq_operations modules_op = { |
1da177e4c
|
2645 2646 2647 2648 2649 |
.start = m_start, .next = m_next, .stop = m_stop, .show = m_show }; |
3b5d5c6b0
|
2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 |
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
|
2669 2670 2671 |
/* Given an address, look for it in the module exception tables. */ const struct exception_table_entry *search_module_extables(unsigned long addr) { |
1da177e4c
|
2672 2673 |
const struct exception_table_entry *e = NULL; struct module *mod; |
24da1cbff
|
2674 |
preempt_disable(); |
d72b37513
|
2675 |
list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4c
|
2676 2677 |
if (mod->num_exentries == 0) continue; |
22a8bdeb5
|
2678 |
|
1da177e4c
|
2679 2680 2681 2682 2683 2684 |
e = search_extable(mod->extable, mod->extable + mod->num_exentries - 1, addr); if (e) break; } |
24da1cbff
|
2685 |
preempt_enable(); |
1da177e4c
|
2686 2687 |
/* Now, if we found one, we are running inside it now, hence |
22a8bdeb5
|
2688 |
we cannot unload the module, hence no refcnt needed. */ |
1da177e4c
|
2689 2690 |
return e; } |
4d435f9d8
|
2691 |
/* |
e610499e2
|
2692 2693 2694 2695 2696 |
* 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
|
2697 |
*/ |
e610499e2
|
2698 |
bool is_module_address(unsigned long addr) |
4d435f9d8
|
2699 |
{ |
e610499e2
|
2700 |
bool ret; |
4d435f9d8
|
2701 |
|
24da1cbff
|
2702 |
preempt_disable(); |
e610499e2
|
2703 |
ret = __module_address(addr) != NULL; |
24da1cbff
|
2704 |
preempt_enable(); |
4d435f9d8
|
2705 |
|
e610499e2
|
2706 |
return ret; |
4d435f9d8
|
2707 |
} |
e610499e2
|
2708 2709 2710 2711 2712 2713 2714 |
/* * __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
|
2715 |
struct module *__module_address(unsigned long addr) |
1da177e4c
|
2716 2717 |
{ struct module *mod; |
3a642e99b
|
2718 2719 |
if (addr < module_addr_min || addr > module_addr_max) return NULL; |
d72b37513
|
2720 |
list_for_each_entry_rcu(mod, &modules, list) |
e610499e2
|
2721 2722 |
if (within_module_core(addr, mod) || within_module_init(addr, mod)) |
1da177e4c
|
2723 2724 2725 |
return mod; return NULL; } |
c6b378019
|
2726 |
EXPORT_SYMBOL_GPL(__module_address); |
1da177e4c
|
2727 |
|
e610499e2
|
2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 |
/* * 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
|
2765 |
EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e2
|
2766 |
|
1da177e4c
|
2767 2768 2769 2770 |
/* Don't grab lock, we're oopsing. */ void print_modules(void) { struct module *mod; |
2bc2d61a9
|
2771 |
char buf[8]; |
1da177e4c
|
2772 2773 |
printk("Modules linked in:"); |
d72b37513
|
2774 2775 2776 |
/* Most callers should already have preempt disabled, but make sure */ preempt_disable(); list_for_each_entry_rcu(mod, &modules, list) |
21aa9280b
|
2777 |
printk(" %s%s", mod->name, module_flags(mod, buf)); |
d72b37513
|
2778 |
preempt_enable(); |
e14af7eeb
|
2779 2780 |
if (last_unloaded_module[0]) printk(" [last unloaded: %s]", last_unloaded_module); |
1da177e4c
|
2781 2782 2783 |
printk(" "); } |
1da177e4c
|
2784 |
#ifdef CONFIG_MODVERSIONS |
8c8ef42ae
|
2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 |
/* 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, struct marker *marker, struct tracepoint *tp) { } EXPORT_SYMBOL(module_layout); |
1da177e4c
|
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#endif |
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#ifdef CONFIG_MARKERS |
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void module_update_markers(void) |
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{ struct module *mod; mutex_lock(&module_mutex); list_for_each_entry(mod, &modules, list) if (!mod->taints) marker_update_probe_range(mod->markers, |
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mod->markers + mod->num_markers); |
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mutex_unlock(&module_mutex); } #endif |
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#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 |