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kernel/module.c
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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/unwind.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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#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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static DEFINE_MUTEX(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_text_address */ 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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struct symsearch { const struct kernel_symbol *start, *stop; const unsigned long *crcs; |
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enum { NOT_GPL_ONLY, GPL_ONLY, WILL_BE_GPL_ONLY, } licence; bool unused; |
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}; |
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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. */ static 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; } struct find_symbol_arg { /* Input */ const char *name; bool gplok; bool warn; /* Output */ struct module *owner; const unsigned long *crc; unsigned long value; }; 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); fsa->value = syms->start[symnum].value; return true; } /* Find a symbol, return value, (optional) crc and (optional) module * which owns it */ static unsigned long find_symbol(const char *name, struct module **owner, const unsigned long **crc, bool gplok, bool warn) { 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; return fsa.value; } |
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DEBUGP("Failed to find symbol %s ", name); |
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return -ENOENT; |
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} |
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/* Search for module by name: must hold module_mutex. */ static struct module *find_module(const char *name) { struct module *mod; list_for_each_entry(mod, &modules, list) { if (strcmp(mod->name, name) == 0) return mod; } return NULL; } #ifdef CONFIG_SMP /* 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])); } } static unsigned int find_pcpusec(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, const char *secstrings) { return find_sec(hdr, sechdrs, secstrings, ".data.percpu"); } |
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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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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); #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); } #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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kfree(mod->field); \ mod->field = NULL; \ |
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} \ static struct module_attribute modinfo_##field = { \ |
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.attr = { .name = __stringify(field), .mode = 0444 }, \ |
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.show = show_modinfo_##field, \ .setup = setup_modinfo_##field, \ .test = modinfo_##field##_exists, \ .free = free_modinfo_##field, \ }; MODINFO_ATTR(version); MODINFO_ATTR(srcversion); |
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static char last_unloaded_module[MODULE_NAME_LEN+1]; |
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#ifdef CONFIG_MODULE_UNLOAD |
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/* Init the unload section of the module. */ static void module_unload_init(struct module *mod) { unsigned int i; INIT_LIST_HEAD(&mod->modules_which_use_me); for (i = 0; i < NR_CPUS; i++) local_set(&mod->ref[i].count, 0); /* Hold reference count during initialization. */ |
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local_set(&mod->ref[raw_smp_processor_id()].count, 1); |
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/* 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 */ static int use_module(struct module *a, struct module *b) { struct module_use *use; |
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602 |
int no_warn, err; |
270a6c4ca
|
603 |
|
1da177e4c
|
604 |
if (b == NULL || already_uses(a, b)) return 1; |
c9a3ba55b
|
605 606 607 608 609 610 611 612 613 614 615 616 |
/* 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
|
617 618 619 620 621 622 623 624 625 626 627 628 629 630 |
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
|
631 |
no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name); |
1da177e4c
|
632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 |
return 1; } /* 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
|
650 |
sysfs_remove_link(i->holders_dir, mod->name); |
1da177e4c
|
651 652 653 654 655 656 657 658 |
/* There can be at most one match. */ break; } } } } #ifdef CONFIG_MODULE_FORCE_UNLOAD |
fb1697933
|
659 |
static inline int try_force_unload(unsigned int flags) |
1da177e4c
|
660 661 662 |
{ int ret = (flags & O_TRUNC); if (ret) |
fb1697933
|
663 |
add_taint(TAINT_FORCED_RMMOD); |
1da177e4c
|
664 665 666 |
return ret; } #else |
fb1697933
|
667 |
static inline int try_force_unload(unsigned int flags) |
1da177e4c
|
668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 |
{ 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
|
684 685 |
/* If it's not unused, quit unless we're forcing. */ if (module_refcount(sref->mod) != 0) { |
fb1697933
|
686 |
if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4c
|
687 688 689 690 691 692 693 694 695 696 |
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
|
697 698 |
if (flags & O_NONBLOCK) { struct stopref sref = { mod, flags, forced }; |
1da177e4c
|
699 |
|
9b1a4d383
|
700 |
return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e1
|
701 702 703 704 705 706 |
} else { /* We don't need to stop the machine for this. */ mod->state = MODULE_STATE_GOING; synchronize_sched(); return 0; } |
1da177e4c
|
707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 |
} unsigned int module_refcount(struct module *mod) { unsigned int i, total = 0; for (i = 0; i < NR_CPUS; i++) total += local_read(&mod->ref[i].count); 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
|
724 |
/* Since we might sleep for some time, release the mutex first */ |
6389a3851
|
725 |
mutex_unlock(&module_mutex); |
1da177e4c
|
726 727 728 729 730 731 732 733 734 |
for (;;) { DEBUGP("Looking at refcount... "); set_current_state(TASK_UNINTERRUPTIBLE); if (module_refcount(mod) == 0) break; schedule(); } current->state = TASK_RUNNING; |
6389a3851
|
735 |
mutex_lock(&module_mutex); |
1da177e4c
|
736 |
} |
dfff0a067
|
737 738 |
asmlinkage long sys_delete_module(const char __user *name_user, unsigned int flags) |
1da177e4c
|
739 740 |
{ struct module *mod; |
dfff0a067
|
741 |
char name[MODULE_NAME_LEN]; |
1da177e4c
|
742 |
int ret, forced = 0; |
dfff0a067
|
743 744 745 746 747 748 |
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'; |
6389a3851
|
749 |
if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4c
|
750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 |
return -EINTR; 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
|
775 |
if (mod->init && !mod->exit) { |
fb1697933
|
776 |
forced = try_force_unload(flags); |
1da177e4c
|
777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 |
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
|
795 |
mutex_unlock(&module_mutex); |
1da177e4c
|
796 |
/* Final destruction now noone is using it. */ |
df4b565e1
|
797 |
if (mod->exit != NULL) |
1da177e4c
|
798 |
mod->exit(); |
df4b565e1
|
799 800 801 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_GOING, mod); mutex_lock(&module_mutex); |
e14af7eeb
|
802 |
/* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e3
|
803 |
strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
346e15beb
|
804 |
unregister_dynamic_debug_module(mod->name); |
1da177e4c
|
805 806 807 |
free_module(mod); out: |
6389a3851
|
808 |
mutex_unlock(&module_mutex); |
1da177e4c
|
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 |
return ret; } static void print_unload_info(struct seq_file *m, struct module *mod) { 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
|
825 826 827 828 829 830 831 832 833 834 835 836 |
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
|
837 |
|
24da1cbff
|
838 |
preempt_disable(); |
ad9546c99
|
839 |
if (IS_ERR_VALUE(find_symbol(symbol, &owner, NULL, true, false))) |
1da177e4c
|
840 841 |
BUG(); module_put(owner); |
24da1cbff
|
842 |
preempt_enable(); |
1da177e4c
|
843 844 845 846 847 |
} EXPORT_SYMBOL(__symbol_put); void symbol_put_addr(void *addr) { |
5e3766138
|
848 |
struct module *modaddr; |
1da177e4c
|
849 |
|
5e3766138
|
850 851 |
if (core_kernel_text((unsigned long)addr)) return; |
1da177e4c
|
852 |
|
5e3766138
|
853 854 855 |
if (!(modaddr = module_text_address((unsigned long)addr))) BUG(); module_put(modaddr); |
1da177e4c
|
856 857 858 859 860 861 |
} EXPORT_SYMBOL_GPL(symbol_put_addr); static ssize_t show_refcnt(struct module_attribute *mattr, struct module *mod, char *buffer) { |
256e2fdf0
|
862 863 |
return sprintf(buffer, "%u ", module_refcount(mod)); |
1da177e4c
|
864 865 866 |
} static struct module_attribute refcnt = { |
7b595756e
|
867 |
.attr = { .name = "refcnt", .mode = 0444 }, |
1da177e4c
|
868 869 |
.show = show_refcnt, }; |
f6a570333
|
870 871 872 873 874 875 876 877 878 879 880 881 |
void module_put(struct module *module) { if (module) { unsigned int cpu = get_cpu(); local_dec(&module->ref[cpu].count); /* 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
|
882 883 884 885 886 887 888 889 890 891 892 893 894 |
#else /* !CONFIG_MODULE_UNLOAD */ static void print_unload_info(struct seq_file *m, struct module *mod) { /* We don't know the usage count, or what modules are using. */ seq_printf(m, " - -"); } static inline void module_unload_free(struct module *mod) { } static inline int use_module(struct module *a, struct module *b) { |
c9a3ba55b
|
895 |
return strong_try_module_get(b) == 0; |
1da177e4c
|
896 897 898 899 900 901 |
} static inline void module_unload_init(struct module *mod) { } #endif /* CONFIG_MODULE_UNLOAD */ |
1f71740ab
|
902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 |
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
|
923 |
.attr = { .name = "initstate", .mode = 0444 }, |
1f71740ab
|
924 925 |
.show = show_initstate, }; |
03e88ae1b
|
926 927 928 |
static struct module_attribute *modinfo_attrs[] = { &modinfo_version, &modinfo_srcversion, |
1f71740ab
|
929 |
&initstate, |
03e88ae1b
|
930 931 932 933 934 |
#ifdef CONFIG_MODULE_UNLOAD &refcnt, #endif NULL, }; |
1da177e4c
|
935 |
static const char vermagic[] = VERMAGIC_STRING; |
826e4506a
|
936 937 938 |
static int try_to_force_load(struct module *mod, const char *symname) { #ifdef CONFIG_MODULE_FORCE_LOAD |
25ddbb18a
|
939 |
if (!test_taint(TAINT_FORCED_MODULE)) |
826e4506a
|
940 941 942 943 944 945 946 947 948 |
printk("%s: no version for \"%s\" found: kernel tainted. ", mod->name, symname); add_taint_module(mod, TAINT_FORCED_MODULE); return 0; #else return -ENOEXEC; #endif } |
1da177e4c
|
949 950 951 952 953 954 955 956 957 958 959 960 961 |
#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
|
962 963 964 |
/* No versions at all? modprobe --force does this. */ if (versindex == 0) return try_to_force_load(mod, symname) == 0; |
1da177e4c
|
965 966 967 968 969 970 971 972 973 974 |
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
|
975 976 977 |
DEBUGP("Found checksum %lX vs module %lX ", *crc, versions[i].crc); |
826e4506a
|
978 |
goto bad_version; |
1da177e4c
|
979 |
} |
826e4506a
|
980 |
|
a5dd69707
|
981 982 983 984 |
printk(KERN_WARNING "%s: no symbol version for %s ", mod->name, symname); return 0; |
826e4506a
|
985 986 987 988 989 990 |
bad_version: printk("%s: disagrees about version of symbol %s ", mod->name, symname); return 0; |
1da177e4c
|
991 992 993 994 995 996 997 |
} static inline int check_modstruct_version(Elf_Shdr *sechdrs, unsigned int versindex, struct module *mod) { const unsigned long *crc; |
1da177e4c
|
998 |
|
ad9546c99
|
999 |
if (IS_ERR_VALUE(find_symbol("struct_module", NULL, &crc, true, false))) |
1da177e4c
|
1000 |
BUG(); |
ad9546c99
|
1001 |
return check_version(sechdrs, versindex, "struct_module", mod, crc); |
1da177e4c
|
1002 |
} |
91e37a793
|
1003 1004 1005 |
/* 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
|
1006 |
{ |
91e37a793
|
1007 1008 1009 1010 |
if (has_crcs) { amagic += strcspn(amagic, " "); bmagic += strcspn(bmagic, " "); } |
1da177e4c
|
1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 |
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
|
1029 1030 |
static inline int same_magic(const char *amagic, const char *bmagic, bool has_crcs) |
1da177e4c
|
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 |
{ 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. */ static unsigned long resolve_symbol(Elf_Shdr *sechdrs, unsigned int versindex, const char *name, struct module *mod) { struct module *owner; unsigned long ret; const unsigned long *crc; |
ad9546c99
|
1046 |
ret = find_symbol(name, &owner, &crc, |
25ddbb18a
|
1047 |
!(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
88173507e
|
1048 |
if (!IS_ERR_VALUE(ret)) { |
9a4b9708f
|
1049 1050 |
/* use_module can fail due to OOM, or module initialization or unloading */ |
1da177e4c
|
1051 1052 |
if (!check_version(sechdrs, versindex, name, mod, crc) || !use_module(mod, owner)) |
88173507e
|
1053 |
ret = -EINVAL; |
1da177e4c
|
1054 |
} |
1da177e4c
|
1055 1056 |
return ret; } |
1da177e4c
|
1057 1058 1059 1060 |
/* * /sys/module/foo/sections stuff * J. Corbet <corbet@lwn.net> */ |
120fc3d77
|
1061 |
#if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
a58730c42
|
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 |
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
|
1075 1076 1077 1078 1079 1080 1081 1082 |
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
|
1083 1084 |
static void free_sect_attrs(struct module_sect_attrs *sect_attrs) { |
a58730c42
|
1085 |
unsigned int section; |
04b1db9fd
|
1086 1087 1088 1089 1090 |
for (section = 0; section < sect_attrs->nsections; section++) kfree(sect_attrs->attrs[section].name); kfree(sect_attrs); } |
1da177e4c
|
1091 1092 1093 1094 1095 1096 1097 |
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
|
1098 |
|
1da177e4c
|
1099 1100 1101 1102 1103 1104 1105 1106 |
/* 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
|
1107 1108 |
sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); if (sect_attrs == NULL) |
1da177e4c
|
1109 1110 1111 1112 1113 |
return; /* Setup section attributes. */ sect_attrs->grp.name = "sections"; sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; |
04b1db9fd
|
1114 |
sect_attrs->nsections = 0; |
1da177e4c
|
1115 1116 1117 1118 1119 1120 |
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
|
1121 1122 1123 1124 1125 |
sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, GFP_KERNEL); if (sattr->name == NULL) goto out; sect_attrs->nsections++; |
1da177e4c
|
1126 1127 1128 |
sattr->mattr.show = module_sect_show; sattr->mattr.store = NULL; sattr->mattr.attr.name = sattr->name; |
1da177e4c
|
1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 |
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
|
1140 |
free_sect_attrs(sect_attrs); |
1da177e4c
|
1141 1142 1143 1144 1145 1146 1147 1148 1149 |
} 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
|
1150 |
free_sect_attrs(mod->sect_attrs); |
1da177e4c
|
1151 1152 1153 |
mod->sect_attrs = NULL; } } |
6d7601338
|
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 |
/* * /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
|
1182 |
kobject_put(notes_attrs->dir); |
6d7601338
|
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 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 1221 1222 1223 1224 |
} 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
|
1225 |
notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d7601338
|
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 |
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
|
1246 |
#else |
04b1db9fd
|
1247 |
|
1da177e4c
|
1248 1249 1250 1251 1252 1253 1254 1255 |
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
|
1256 1257 1258 1259 1260 1261 1262 1263 1264 |
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
|
1265 |
#endif |
1da177e4c
|
1266 |
|
ef665c1a0
|
1267 1268 |
#ifdef CONFIG_SYSFS int module_add_modinfo_attrs(struct module *mod) |
c988d2b28
|
1269 1270 |
{ struct module_attribute *attr; |
03e88ae1b
|
1271 |
struct module_attribute *temp_attr; |
c988d2b28
|
1272 1273 |
int error = 0; int i; |
03e88ae1b
|
1274 1275 1276 1277 1278 1279 1280 |
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
|
1281 1282 |
for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { if (!attr->test || |
03e88ae1b
|
1283 1284 |
(attr->test && attr->test(mod))) { memcpy(temp_attr, attr, sizeof(*temp_attr)); |
03e88ae1b
|
1285 1286 1287 |
error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); ++temp_attr; } |
c988d2b28
|
1288 1289 1290 |
} return error; } |
ef665c1a0
|
1291 |
void module_remove_modinfo_attrs(struct module *mod) |
c988d2b28
|
1292 1293 1294 |
{ struct module_attribute *attr; int i; |
03e88ae1b
|
1295 1296 1297 1298 |
for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { /* pick a field to test for end of list */ if (!attr->attr.name) break; |
c988d2b28
|
1299 |
sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1b
|
1300 1301 |
if (attr->free) attr->free(mod); |
c988d2b28
|
1302 |
} |
03e88ae1b
|
1303 |
kfree(mod->modinfo_attrs); |
c988d2b28
|
1304 |
} |
1da177e4c
|
1305 |
|
ef665c1a0
|
1306 |
int mod_sysfs_init(struct module *mod) |
1da177e4c
|
1307 1308 |
{ int err; |
6494a93d5
|
1309 |
struct kobject *kobj; |
1da177e4c
|
1310 |
|
823bccfc4
|
1311 1312 1313 |
if (!module_sysfs_initialized) { printk(KERN_ERR "%s: module sysfs not initialized ", |
1cc5f7142
|
1314 1315 1316 1317 |
mod->name); err = -EINVAL; goto out; } |
6494a93d5
|
1318 1319 1320 1321 1322 1323 1324 1325 1326 |
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
|
1327 |
mod->mkobj.mod = mod; |
e17e0f51a
|
1328 |
|
ac3c8141f
|
1329 1330 1331 1332 1333 1334 |
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
|
1335 |
|
97c146ef0
|
1336 |
/* delay uevent until full sysfs population */ |
270a6c4ca
|
1337 1338 1339 |
out: return err; } |
ef665c1a0
|
1340 |
int mod_sysfs_setup(struct module *mod, |
270a6c4ca
|
1341 1342 1343 1344 |
struct kernel_param *kparam, unsigned int num_params) { int err; |
4ff6abff8
|
1345 |
mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e18
|
1346 1347 |
if (!mod->holders_dir) { err = -ENOMEM; |
270a6c4ca
|
1348 |
goto out_unreg; |
240936e18
|
1349 |
} |
270a6c4ca
|
1350 |
|
1da177e4c
|
1351 1352 |
err = module_param_sysfs_setup(mod, kparam, num_params); if (err) |
270a6c4ca
|
1353 |
goto out_unreg_holders; |
1da177e4c
|
1354 |
|
c988d2b28
|
1355 1356 |
err = module_add_modinfo_attrs(mod); if (err) |
e17e0f51a
|
1357 |
goto out_unreg_param; |
c988d2b28
|
1358 |
|
e17e0f51a
|
1359 |
kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4c
|
1360 |
return 0; |
e17e0f51a
|
1361 1362 |
out_unreg_param: module_param_sysfs_remove(mod); |
270a6c4ca
|
1363 |
out_unreg_holders: |
78a2d906b
|
1364 |
kobject_put(mod->holders_dir); |
270a6c4ca
|
1365 |
out_unreg: |
e17e0f51a
|
1366 |
kobject_put(&mod->mkobj.kobj); |
1da177e4c
|
1367 1368 |
return err; } |
34e4e2fef
|
1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 |
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
|
1382 1383 1384 |
static void mod_kobject_remove(struct module *mod) { |
c988d2b28
|
1385 |
module_remove_modinfo_attrs(mod); |
1da177e4c
|
1386 |
module_param_sysfs_remove(mod); |
78a2d906b
|
1387 1388 |
kobject_put(mod->mkobj.drivers_dir); kobject_put(mod->holders_dir); |
34e4e2fef
|
1389 |
mod_sysfs_fini(mod); |
1da177e4c
|
1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 |
} /* * 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
|
1402 |
/* Free a module, remove from lists, etc (must hold module_mutex). */ |
1da177e4c
|
1403 1404 1405 |
static void free_module(struct module *mod) { /* Delete from various lists */ |
9b1a4d383
|
1406 |
stop_machine(__unlink_module, mod, NULL); |
6d7601338
|
1407 |
remove_notes_attrs(mod); |
1da177e4c
|
1408 1409 |
remove_sect_attrs(mod); mod_kobject_remove(mod); |
4552d5dc0
|
1410 |
unwind_remove_table(mod->unwind_info, 0); |
1da177e4c
|
1411 1412 1413 1414 1415 |
/* Arch-specific cleanup. */ module_arch_cleanup(mod); /* Module unload stuff */ module_unload_free(mod); |
fed1939c6
|
1416 1417 |
/* release any pointers to mcount in this module */ ftrace_release(mod->module_core, mod->core_size); |
1da177e4c
|
1418 1419 1420 1421 1422 |
/* This may be NULL, but that's OK */ module_free(mod, mod->module_init); kfree(mod->args); if (mod->percpu) percpu_modfree(mod->percpu); |
fbb9ce953
|
1423 1424 |
/* Free lock-classes: */ lockdep_free_key_range(mod->module_core, mod->core_size); |
1da177e4c
|
1425 1426 1427 1428 1429 1430 1431 |
/* Finally, free the core (containing the module structure) */ module_free(mod, mod->module_core); } void *__symbol_get(const char *symbol) { struct module *owner; |
24da1cbff
|
1432 |
unsigned long value; |
1da177e4c
|
1433 |
|
24da1cbff
|
1434 |
preempt_disable(); |
ad9546c99
|
1435 |
value = find_symbol(symbol, &owner, NULL, true, true); |
88173507e
|
1436 1437 1438 |
if (IS_ERR_VALUE(value)) value = 0; else if (strong_try_module_get(owner)) |
1da177e4c
|
1439 |
value = 0; |
24da1cbff
|
1440 |
preempt_enable(); |
1da177e4c
|
1441 1442 1443 1444 |
return (void *)value; } EXPORT_SYMBOL_GPL(__symbol_get); |
eea8b54dc
|
1445 1446 |
/* * Ensure that an exported symbol [global namespace] does not already exist |
02a3e59a0
|
1447 |
* in the kernel or in some other module's exported symbol table. |
eea8b54dc
|
1448 1449 1450 |
*/ static int verify_export_symbols(struct module *mod) { |
b211104d1
|
1451 |
unsigned int i; |
eea8b54dc
|
1452 |
struct module *owner; |
b211104d1
|
1453 1454 1455 1456 1457 1458 1459 1460 |
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
|
1461 |
#ifdef CONFIG_UNUSED_SYMBOLS |
b211104d1
|
1462 1463 |
{ mod->unused_syms, mod->num_unused_syms }, { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, |
f7f5b6755
|
1464 |
#endif |
b211104d1
|
1465 |
}; |
eea8b54dc
|
1466 |
|
b211104d1
|
1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 |
for (i = 0; i < ARRAY_SIZE(arr); i++) { for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { if (!IS_ERR_VALUE(find_symbol(s->name, &owner, NULL, true, false))) { printk(KERN_ERR "%s: exports duplicate symbol %s" " (owned by %s) ", mod->name, s->name, module_name(owner)); return -ENOEXEC; } |
eea8b54dc
|
1478 |
} |
b211104d1
|
1479 1480 |
} return 0; |
eea8b54dc
|
1481 |
} |
9a4b9708f
|
1482 |
/* Change all symbols so that st_value encodes the pointer directly. */ |
1da177e4c
|
1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 |
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; 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: sym[i].st_value = resolve_symbol(sechdrs, versindex, strtab + sym[i].st_name, mod); /* Ok if resolved. */ |
88173507e
|
1521 |
if (!IS_ERR_VALUE(sym[i].st_value)) |
1da177e4c
|
1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 |
break; /* 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; } /* Update size with this section: return offset. */ |
2f0f2a334
|
1548 |
static long get_offset(unsigned int *size, Elf_Shdr *sechdr) |
1da177e4c
|
1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 |
{ long ret; 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 || strncmp(secstrings + s->sh_name, ".init", 5) == 0) continue; s->sh_entsize = get_offset(&mod->core_size, s); 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 || strncmp(secstrings + s->sh_name, ".init", 5) != 0) continue; s->sh_entsize = (get_offset(&mod->init_size, s) | INIT_OFFSET_MASK); DEBUGP("\t%s ", secstrings + s->sh_name); } if (m == 0) mod->init_text_size = mod->init_size; } } |
1da177e4c
|
1621 1622 1623 1624 |
static void set_license(struct module *mod, const char *license) { if (!license) license = "unspecified"; |
fa3ba2e81
|
1625 |
if (!license_is_gpl_compatible(license)) { |
25ddbb18a
|
1626 |
if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d26276
|
1627 |
printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e81
|
1628 1629 1630 |
"kernel. ", mod->name, license); add_taint_module(mod, TAINT_PROPRIETARY_MODULE); |
1da177e4c
|
1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 |
} } /* 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
|
1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 |
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
|
1681 |
|
1da177e4c
|
1682 |
#ifdef CONFIG_KALLSYMS |
15bba37d6
|
1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 |
/* 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; } |
ea07890a6
|
1695 |
static int is_exported(const char *name, const struct module *mod) |
1da177e4c
|
1696 |
{ |
3fd6805f4
|
1697 1698 1699 |
if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab)) return 1; else |
f867d2a2e
|
1700 |
if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms)) |
1da177e4c
|
1701 |
return 1; |
3fd6805f4
|
1702 1703 |
else return 0; |
1da177e4c
|
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 |
} /* 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'; } if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug", strlen(".debug")) == 0) 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 */ |
5e458cc0f
|
1773 |
static void dynamic_printk_setup(struct mod_debug *debug, unsigned int num) |
346e15beb
|
1774 |
{ |
5e458cc0f
|
1775 1776 |
#ifdef CONFIG_DYNAMIC_PRINTK_DEBUG unsigned int i; |
346e15beb
|
1777 |
|
5e458cc0f
|
1778 1779 1780 1781 1782 1783 |
for (i = 0; i < num; i++) { register_dynamic_debug_module(debug[i].modname, debug[i].type, debug[i].logical_modname, debug[i].flag_names, debug[i].hash, debug[i].hash2); |
346e15beb
|
1784 |
} |
346e15beb
|
1785 |
#endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */ |
5e458cc0f
|
1786 |
} |
346e15beb
|
1787 |
|
3a642e99b
|
1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 |
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
|
1801 1802 |
/* Allocate and load the module: note that size of section 0 is always zero, and we rely on this for optional sections. */ |
ffb4ba76a
|
1803 |
static noinline struct module *load_module(void __user *umod, |
1da177e4c
|
1804 1805 1806 1807 1808 1809 |
unsigned long len, const char __user *uargs) { Elf_Ehdr *hdr; Elf_Shdr *sechdrs; char *secstrings, *args, *modmagic, *strtab = NULL; |
061b1bd39
|
1810 |
char *staging; |
84860f997
|
1811 1812 1813 |
unsigned int i; unsigned int symindex = 0; unsigned int strindex = 0; |
5e458cc0f
|
1814 |
unsigned int modindex, versindex, infoindex, pcpuindex; |
84860f997
|
1815 |
unsigned int unwindex = 0; |
5e458cc0f
|
1816 1817 |
unsigned int num_kp, num_mcount; struct kernel_param *kp; |
1da177e4c
|
1818 1819 1820 |
struct module *mod; long err = 0; void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ |
5e458cc0f
|
1821 |
unsigned long *mseg; |
378bac820
|
1822 |
mm_segment_t old_fs; |
1da177e4c
|
1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 |
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); 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
|
1841 |
if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 |
1da177e4c
|
1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 |
|| 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 */ if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0) 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
|
1887 |
/* This is temporary: point mod into copy of data. */ |
1da177e4c
|
1888 1889 1890 1891 1892 1893 1894 1895 1896 |
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
|
1897 1898 1899 |
versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); |
4552d5dc0
|
1900 1901 1902 |
#ifdef ARCH_UNWIND_SECTION_NAME unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME); #endif |
1da177e4c
|
1903 |
|
ea01e798e
|
1904 |
/* Don't keep modinfo and version sections. */ |
1da177e4c
|
1905 |
sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
ea01e798e
|
1906 |
sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4c
|
1907 1908 1909 1910 1911 |
#ifdef CONFIG_KALLSYMS /* Keep symbol and string tables for decoding later. */ sechdrs[symindex].sh_flags |= SHF_ALLOC; sechdrs[strindex].sh_flags |= SHF_ALLOC; #endif |
4552d5dc0
|
1912 1913 |
if (unwindex) sechdrs[unwindex].sh_flags |= SHF_ALLOC; |
1da177e4c
|
1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 |
/* 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) { |
826e4506a
|
1924 1925 1926 |
err = try_to_force_load(mod, "magic"); if (err) goto free_hdr; |
91e37a793
|
1927 |
} else if (!same_magic(modmagic, vermagic, versindex)) { |
1da177e4c
|
1928 1929 1930 1931 1932 1933 |
printk(KERN_ERR "%s: version magic '%s' should be '%s' ", mod->name, modmagic, vermagic); err = -ENOEXEC; goto free_hdr; } |
061b1bd39
|
1934 1935 1936 1937 1938 1939 1940 1941 |
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
|
1942 |
/* Now copy in args */ |
24277dda3
|
1943 1944 1945 |
args = strndup_user(uargs, ~0UL >> 1); if (IS_ERR(args)) { err = PTR_ERR(args); |
1da177e4c
|
1946 1947 |
goto free_hdr; } |
8e08b7568
|
1948 |
|
1da177e4c
|
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 |
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
|
1964 1965 |
sechdrs[pcpuindex].sh_addralign, mod->name); |
1da177e4c
|
1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 |
if (!percpu) { err = -ENOMEM; goto free_mod; } 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
|
1980 |
ptr = module_alloc_update_bounds(mod->core_size); |
1da177e4c
|
1981 1982 1983 1984 1985 1986 |
if (!ptr) { err = -ENOMEM; goto free_percpu; } memset(ptr, 0, mod->core_size); mod->module_core = ptr; |
3a642e99b
|
1987 |
ptr = module_alloc_update_bounds(mod->init_size); |
1da177e4c
|
1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 |
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; /* Now we've moved module, initialize linked lists, etc. */ module_unload_init(mod); |
97c146ef0
|
2023 |
/* add kobject, so we can reference it. */ |
d58ae6781
|
2024 2025 |
err = mod_sysfs_init(mod); if (err) |
97c146ef0
|
2026 |
goto free_unload; |
270a6c4ca
|
2027 |
|
1da177e4c
|
2028 2029 |
/* Set up license info based on the info section */ set_license(mod, get_modinfo(sechdrs, infoindex, "license")); |
9b37ccfc6
|
2030 2031 2032 2033 2034 |
/* * 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
|
2035 |
if (strcmp(mod->name, "ndiswrapper") == 0) |
9b37ccfc6
|
2036 2037 2038 |
add_taint(TAINT_PROPRIETARY_MODULE); /* driverloader was caught wrongly pretending to be under GPL */ |
fa3ba2e81
|
2039 2040 |
if (strcmp(mod->name, "driverloader") == 0) add_taint_module(mod, TAINT_PROPRIETARY_MODULE); |
9841d61d7
|
2041 |
|
c988d2b28
|
2042 2043 |
/* Set up MODINFO_ATTR fields */ setup_modinfo(mod, sechdrs, infoindex); |
c988d2b28
|
2044 |
|
1da177e4c
|
2045 2046 2047 2048 2049 |
/* 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
|
2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 |
/* Now we've got everything in the final locations, we can * find optional sections. */ kp = section_objs(hdr, sechdrs, secstrings, "__param", sizeof(*kp), &num_kp); 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
|
2067 |
|
f7f5b6755
|
2068 |
#ifdef CONFIG_UNUSED_SYMBOLS |
5e458cc0f
|
2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 |
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
|
2092 |
#endif |
f71d20e96
|
2093 |
|
1da177e4c
|
2094 |
#ifdef CONFIG_MODVERSIONS |
5e458cc0f
|
2095 2096 2097 |
if ((mod->num_syms && !mod->crcs) || (mod->num_gpl_syms && !mod->gpl_crcs) || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) |
f7f5b6755
|
2098 |
#ifdef CONFIG_UNUSED_SYMBOLS |
5e458cc0f
|
2099 2100 |
|| (mod->num_unused_syms && !mod->unused_crcs) || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) |
f7f5b6755
|
2101 2102 |
#endif ) { |
826e4506a
|
2103 2104 2105 2106 2107 |
printk(KERN_WARNING "%s: No versions for exported symbols. ", mod->name); err = try_to_force_load(mod, "nocrc"); if (err) goto cleanup; |
1da177e4c
|
2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 |
} #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
|
2132 2133 |
/* Find duplicate symbols */ err = verify_export_symbols(mod); |
eea8b54dc
|
2134 2135 |
if (err < 0) goto cleanup; |
1da177e4c
|
2136 |
/* Set up and sort exception table */ |
5e458cc0f
|
2137 2138 2139 |
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
|
2140 2141 2142 2143 2144 2145 |
/* 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
|
2146 |
if (!mod->taints) { |
5e458cc0f
|
2147 2148 |
struct mod_debug *debug; unsigned int num_debug; |
5e458cc0f
|
2149 2150 2151 |
debug = section_objs(hdr, sechdrs, secstrings, "__verbose", sizeof(*debug), &num_debug); dynamic_printk_setup(debug, num_debug); |
97e1c18e8
|
2152 |
} |
90d595fe5
|
2153 |
|
fed1939c6
|
2154 |
/* sechdrs[0].sh_size is always zero */ |
5e458cc0f
|
2155 2156 |
mseg = section_objs(hdr, sechdrs, secstrings, "__mcount_loc", sizeof(*mseg), &num_mcount); |
31e889098
|
2157 |
ftrace_init_module(mod, mseg, mseg + num_mcount); |
90d595fe5
|
2158 |
|
1da177e4c
|
2159 2160 2161 |
err = module_finalize(hdr, sechdrs, mod); if (err < 0) goto cleanup; |
378bac820
|
2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 |
/* 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
|
2179 |
mod->args = args; |
5e458cc0f
|
2180 |
if (section_addr(hdr, sechdrs, secstrings, "__obsparm")) |
8d3b33f67
|
2181 2182 2183 |
printk(KERN_WARNING "%s: Ignoring obsolete parameters ", mod->name); |
bb9d3d56e
|
2184 |
/* Now sew it into the lists so we can get lockdep and oops |
d72b37513
|
2185 2186 2187 2188 2189 2190 2191 |
* 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
|
2192 |
|
5e458cc0f
|
2193 |
err = parse_args(mod->name, mod->args, kp, num_kp, NULL); |
1da177e4c
|
2194 |
if (err < 0) |
bb9d3d56e
|
2195 |
goto unlink; |
1da177e4c
|
2196 |
|
5e458cc0f
|
2197 |
err = mod_sysfs_setup(mod, kp, num_kp); |
1da177e4c
|
2198 |
if (err < 0) |
bb9d3d56e
|
2199 |
goto unlink; |
1da177e4c
|
2200 |
add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
6d7601338
|
2201 |
add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
1da177e4c
|
2202 |
|
4552d5dc0
|
2203 2204 |
/* Size of section 0 is 0, so this works well if no unwind info. */ mod->unwind_info = unwind_add_table(mod, |
22a8bdeb5
|
2205 2206 |
(void *)sechdrs[unwindex].sh_addr, sechdrs[unwindex].sh_size); |
4552d5dc0
|
2207 |
|
1da177e4c
|
2208 2209 2210 2211 2212 |
/* Get rid of temporary copy */ vfree(hdr); /* Done! */ return mod; |
bb9d3d56e
|
2213 |
unlink: |
9b1a4d383
|
2214 |
stop_machine(__unlink_module, mod, NULL); |
1da177e4c
|
2215 2216 |
module_arch_cleanup(mod); cleanup: |
97c146ef0
|
2217 2218 |
kobject_del(&mod->mkobj.kobj); kobject_put(&mod->mkobj.kobj); |
fed1939c6
|
2219 |
ftrace_release(mod->module_core, mod->core_size); |
97c146ef0
|
2220 |
free_unload: |
1da177e4c
|
2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 |
module_unload_free(mod); module_free(mod, mod->module_init); free_core: module_free(mod, mod->module_core); free_percpu: if (percpu) percpu_modfree(percpu); free_mod: kfree(args); free_hdr: vfree(hdr); |
6fe2e70bb
|
2232 |
return ERR_PTR(err); |
1da177e4c
|
2233 2234 2235 2236 2237 2238 2239 |
truncated: printk(KERN_ERR "Module len %lu truncated ", len); err = -ENOEXEC; goto free_hdr; } |
1da177e4c
|
2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 |
/* This is where the real work happens */ asmlinkage long sys_init_module(void __user *umod, unsigned long len, const char __user *uargs) { 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
|
2254 |
if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4c
|
2255 2256 2257 2258 2259 |
return -EINTR; /* Do all the hard work */ mod = load_module(umod, len, uargs); if (IS_ERR(mod)) { |
6389a3851
|
2260 |
mutex_unlock(&module_mutex); |
1da177e4c
|
2261 2262 |
return PTR_ERR(mod); } |
1da177e4c
|
2263 |
/* Drop lock so they can recurse */ |
6389a3851
|
2264 |
mutex_unlock(&module_mutex); |
1da177e4c
|
2265 |
|
e041c6834
|
2266 2267 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_COMING, mod); |
1da177e4c
|
2268 2269 2270 |
/* Start the module */ if (mod->init != NULL) |
59f9415ff
|
2271 |
ret = do_one_initcall(mod->init); |
1da177e4c
|
2272 2273 2274 2275 |
if (ret < 0) { /* Init routine failed: abort. Try to protect us from buggy refcounters. */ mod->state = MODULE_STATE_GOING; |
fbd568a3e
|
2276 |
synchronize_sched(); |
af49d9248
|
2277 |
module_put(mod); |
df4b565e1
|
2278 2279 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_GOING, mod); |
af49d9248
|
2280 2281 2282 |
mutex_lock(&module_mutex); free_module(mod); mutex_unlock(&module_mutex); |
c9a3ba55b
|
2283 |
wake_up(&module_wq); |
1da177e4c
|
2284 2285 |
return ret; } |
e24e2e64c
|
2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 |
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
|
2296 |
|
6c5db22d2
|
2297 |
/* Now it's a first class citizen! Wake up anyone waiting for it. */ |
1da177e4c
|
2298 |
mod->state = MODULE_STATE_LIVE; |
6c5db22d2
|
2299 2300 2301 |
wake_up(&module_wq); mutex_lock(&module_mutex); |
1da177e4c
|
2302 2303 |
/* Drop initial reference. */ module_put(mod); |
4552d5dc0
|
2304 |
unwind_remove_table(mod->unwind_info, 1); |
1da177e4c
|
2305 2306 2307 2308 |
module_free(mod, mod->module_init); mod->module_init = NULL; mod->init_size = 0; mod->init_text_size = 0; |
6389a3851
|
2309 |
mutex_unlock(&module_mutex); |
1da177e4c
|
2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 |
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 $d. */ static inline int is_arm_mapping_symbol(const char *str) { |
22a8bdeb5
|
2326 |
return str[0] == '$' && strchr("atd", str[1]) |
1da177e4c
|
2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 |
&& (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 */ if (within(addr, mod->module_init, mod->init_size)) nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb5
|
2341 |
else |
1da177e4c
|
2342 2343 2344 |
nextval = (unsigned long)mod->module_core+mod->core_text_size; /* Scan for closest preceeding symbol, and next symbol. (ELF |
22a8bdeb5
|
2345 |
starts real symbols at 1). */ |
1da177e4c
|
2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 |
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
|
2366 2367 2368 2369 |
if (size) *size = nextval - mod->symtab[best].st_value; if (offset) *offset = addr - mod->symtab[best].st_value; |
1da177e4c
|
2370 2371 |
return mod->strtab + mod->symtab[best].st_name; } |
6dd06c9fb
|
2372 2373 |
/* For kallsyms to ask for address resolution. NULL means not found. Careful * not to lock to avoid deadlock on oopses, simply disable preemption. */ |
92dfc9dc7
|
2374 |
const char *module_address_lookup(unsigned long addr, |
6dd06c9fb
|
2375 2376 2377 2378 |
unsigned long *size, unsigned long *offset, char **modname, char *namebuf) |
1da177e4c
|
2379 2380 |
{ struct module *mod; |
cb2a52052
|
2381 |
const char *ret = NULL; |
1da177e4c
|
2382 |
|
cb2a52052
|
2383 |
preempt_disable(); |
d72b37513
|
2384 |
list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4c
|
2385 2386 |
if (within(addr, mod->module_init, mod->init_size) || within(addr, mod->module_core, mod->core_size)) { |
ffc508919
|
2387 2388 |
if (modname) *modname = mod->name; |
cb2a52052
|
2389 2390 |
ret = get_ksymbol(mod, addr, size, offset); break; |
1da177e4c
|
2391 2392 |
} } |
6dd06c9fb
|
2393 2394 2395 2396 2397 |
/* Make a copy in here where it's safe */ if (ret) { strncpy(namebuf, ret, KSYM_NAME_LEN - 1); ret = namebuf; } |
cb2a52052
|
2398 |
preempt_enable(); |
92dfc9dc7
|
2399 |
return ret; |
1da177e4c
|
2400 |
} |
9d65cb4a1
|
2401 2402 2403 |
int lookup_module_symbol_name(unsigned long addr, char *symname) { struct module *mod; |
cb2a52052
|
2404 |
preempt_disable(); |
d72b37513
|
2405 |
list_for_each_entry_rcu(mod, &modules, list) { |
9d65cb4a1
|
2406 2407 2408 2409 2410 2411 2412 |
if (within(addr, mod->module_init, mod->init_size) || within(addr, mod->module_core, mod->core_size)) { const char *sym; sym = get_ksymbol(mod, addr, NULL, NULL); if (!sym) goto out; |
9281acea6
|
2413 |
strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a52052
|
2414 |
preempt_enable(); |
9d65cb4a1
|
2415 2416 2417 2418 |
return 0; } } out: |
cb2a52052
|
2419 |
preempt_enable(); |
9d65cb4a1
|
2420 2421 |
return -ERANGE; } |
a5c43dae7
|
2422 2423 2424 2425 |
int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) { struct module *mod; |
cb2a52052
|
2426 |
preempt_disable(); |
d72b37513
|
2427 |
list_for_each_entry_rcu(mod, &modules, list) { |
a5c43dae7
|
2428 2429 2430 2431 2432 2433 2434 2435 |
if (within(addr, mod->module_init, mod->init_size) || within(addr, mod->module_core, mod->core_size)) { const char *sym; sym = get_ksymbol(mod, addr, size, offset); if (!sym) goto out; if (modname) |
9281acea6
|
2436 |
strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae7
|
2437 |
if (name) |
9281acea6
|
2438 |
strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a52052
|
2439 |
preempt_enable(); |
a5c43dae7
|
2440 2441 2442 2443 |
return 0; } } out: |
cb2a52052
|
2444 |
preempt_enable(); |
a5c43dae7
|
2445 2446 |
return -ERANGE; } |
ea07890a6
|
2447 2448 |
int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, char *name, char *module_name, int *exported) |
1da177e4c
|
2449 2450 |
{ struct module *mod; |
cb2a52052
|
2451 |
preempt_disable(); |
d72b37513
|
2452 |
list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4c
|
2453 2454 2455 |
if (symnum < mod->num_symtab) { *value = mod->symtab[symnum].st_value; *type = mod->symtab[symnum].st_info; |
098c5eea0
|
2456 |
strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea6
|
2457 2458 |
KSYM_NAME_LEN); strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ea07890a6
|
2459 |
*exported = is_exported(name, mod); |
cb2a52052
|
2460 |
preempt_enable(); |
ea07890a6
|
2461 |
return 0; |
1da177e4c
|
2462 2463 2464 |
} symnum -= mod->num_symtab; } |
cb2a52052
|
2465 |
preempt_enable(); |
ea07890a6
|
2466 |
return -ERANGE; |
1da177e4c
|
2467 2468 2469 2470 2471 2472 2473 |
} static unsigned long mod_find_symname(struct module *mod, const char *name) { unsigned int i; for (i = 0; i < mod->num_symtab; i++) |
54e8ce463
|
2474 2475 |
if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && mod->symtab[i].st_info != 'U') |
1da177e4c
|
2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 |
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
|
2488 |
preempt_disable(); |
1da177e4c
|
2489 2490 2491 2492 2493 2494 |
if ((colon = strchr(name, ':')) != NULL) { *colon = '\0'; if ((mod = find_module(name)) != NULL) ret = mod_find_symname(mod, colon+1); *colon = ':'; } else { |
d72b37513
|
2495 |
list_for_each_entry_rcu(mod, &modules, list) |
1da177e4c
|
2496 2497 2498 |
if ((ret = mod_find_symname(mod, name)) != 0) break; } |
cb2a52052
|
2499 |
preempt_enable(); |
1da177e4c
|
2500 2501 2502 |
return ret; } #endif /* CONFIG_KALLSYMS */ |
21aa9280b
|
2503 |
static char *module_flags(struct module *mod, char *buf) |
fa3ba2e81
|
2504 2505 |
{ int bx = 0; |
21aa9280b
|
2506 2507 2508 |
if (mod->taints || mod->state == MODULE_STATE_GOING || mod->state == MODULE_STATE_COMING) { |
fa3ba2e81
|
2509 |
buf[bx++] = '('; |
25ddbb18a
|
2510 |
if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) |
fa3ba2e81
|
2511 |
buf[bx++] = 'P'; |
25ddbb18a
|
2512 |
if (mod->taints & (1 << TAINT_FORCED_MODULE)) |
fa3ba2e81
|
2513 |
buf[bx++] = 'F'; |
26e9a3977
|
2514 |
if (mod->taints & (1 << TAINT_CRAP)) |
061b1bd39
|
2515 |
buf[bx++] = 'C'; |
fa3ba2e81
|
2516 2517 2518 2519 2520 |
/* * TAINT_FORCED_RMMOD: could be added. * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't * apply to modules. */ |
21aa9280b
|
2521 2522 2523 2524 2525 2526 2527 |
/* 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
|
2528 2529 2530 2531 2532 2533 |
buf[bx++] = ')'; } buf[bx] = '\0'; return buf; } |
3b5d5c6b0
|
2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 |
#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
|
2551 2552 2553 |
static int m_show(struct seq_file *m, void *p) { struct module *mod = list_entry(p, struct module, list); |
fa3ba2e81
|
2554 |
char buf[8]; |
2f0f2a334
|
2555 |
seq_printf(m, "%s %u", |
1da177e4c
|
2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 |
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
|
2566 2567 |
/* Taints info */ if (mod->taints) |
21aa9280b
|
2568 |
seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e81
|
2569 |
|
1da177e4c
|
2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 |
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
|
2580 |
static const struct seq_operations modules_op = { |
1da177e4c
|
2581 2582 2583 2584 2585 |
.start = m_start, .next = m_next, .stop = m_stop, .show = m_show }; |
3b5d5c6b0
|
2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 |
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
|
2605 2606 2607 |
/* Given an address, look for it in the module exception tables. */ const struct exception_table_entry *search_module_extables(unsigned long addr) { |
1da177e4c
|
2608 2609 |
const struct exception_table_entry *e = NULL; struct module *mod; |
24da1cbff
|
2610 |
preempt_disable(); |
d72b37513
|
2611 |
list_for_each_entry_rcu(mod, &modules, list) { |
1da177e4c
|
2612 2613 |
if (mod->num_exentries == 0) continue; |
22a8bdeb5
|
2614 |
|
1da177e4c
|
2615 2616 2617 2618 2619 2620 |
e = search_extable(mod->extable, mod->extable + mod->num_exentries - 1, addr); if (e) break; } |
24da1cbff
|
2621 |
preempt_enable(); |
1da177e4c
|
2622 2623 |
/* Now, if we found one, we are running inside it now, hence |
22a8bdeb5
|
2624 |
we cannot unload the module, hence no refcnt needed. */ |
1da177e4c
|
2625 2626 |
return e; } |
4d435f9d8
|
2627 2628 2629 2630 2631 |
/* * Is this a valid module address? */ int is_module_address(unsigned long addr) { |
4d435f9d8
|
2632 |
struct module *mod; |
24da1cbff
|
2633 |
preempt_disable(); |
4d435f9d8
|
2634 |
|
d72b37513
|
2635 |
list_for_each_entry_rcu(mod, &modules, list) { |
4d435f9d8
|
2636 |
if (within(addr, mod->module_core, mod->core_size)) { |
24da1cbff
|
2637 |
preempt_enable(); |
4d435f9d8
|
2638 2639 2640 |
return 1; } } |
24da1cbff
|
2641 |
preempt_enable(); |
4d435f9d8
|
2642 2643 2644 |
return 0; } |
24da1cbff
|
2645 |
/* Is this a valid kernel address? */ |
8b96f0119
|
2646 |
__notrace_funcgraph struct module *__module_text_address(unsigned long addr) |
1da177e4c
|
2647 2648 |
{ struct module *mod; |
3a642e99b
|
2649 2650 |
if (addr < module_addr_min || addr > module_addr_max) return NULL; |
d72b37513
|
2651 |
list_for_each_entry_rcu(mod, &modules, list) |
1da177e4c
|
2652 2653 2654 2655 2656 2657 2658 2659 2660 |
if (within(addr, mod->module_init, mod->init_text_size) || within(addr, mod->module_core, mod->core_text_size)) return mod; return NULL; } struct module *module_text_address(unsigned long addr) { struct module *mod; |
1da177e4c
|
2661 |
|
24da1cbff
|
2662 |
preempt_disable(); |
1da177e4c
|
2663 |
mod = __module_text_address(addr); |
24da1cbff
|
2664 |
preempt_enable(); |
1da177e4c
|
2665 2666 2667 2668 2669 2670 2671 2672 |
return mod; } /* Don't grab lock, we're oopsing. */ void print_modules(void) { struct module *mod; |
2bc2d61a9
|
2673 |
char buf[8]; |
1da177e4c
|
2674 2675 |
printk("Modules linked in:"); |
d72b37513
|
2676 2677 2678 |
/* Most callers should already have preempt disabled, but make sure */ preempt_disable(); list_for_each_entry_rcu(mod, &modules, list) |
21aa9280b
|
2679 |
printk(" %s%s", mod->name, module_flags(mod, buf)); |
d72b37513
|
2680 |
preempt_enable(); |
e14af7eeb
|
2681 2682 |
if (last_unloaded_module[0]) printk(" [last unloaded: %s]", last_unloaded_module); |
1da177e4c
|
2683 2684 2685 |
printk(" "); } |
1da177e4c
|
2686 2687 2688 2689 2690 |
#ifdef CONFIG_MODVERSIONS /* Generate the signature for struct module here, too, for modversions. */ void struct_module(struct module *mod) { return; } EXPORT_SYMBOL(struct_module); #endif |
8256e47cd
|
2691 2692 |
#ifdef CONFIG_MARKERS |
fb40bd78b
|
2693 |
void module_update_markers(void) |
8256e47cd
|
2694 2695 2696 2697 2698 2699 2700 |
{ struct module *mod; mutex_lock(&module_mutex); list_for_each_entry(mod, &modules, list) if (!mod->taints) marker_update_probe_range(mod->markers, |
fb40bd78b
|
2701 |
mod->markers + mod->num_markers); |
8256e47cd
|
2702 2703 2704 |
mutex_unlock(&module_mutex); } #endif |
97e1c18e8
|
2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 |
#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 |