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kernel/module.c
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/* Rewritten by Rusty Russell, on the backs of many others... 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 */ #include <linux/config.h> #include <linux/module.h> #include <linux/moduleloader.h> #include <linux/init.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> #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> #include <linux/stop_machine.h> #include <linux/device.h> |
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#include <linux/string.h> |
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#include <linux/sched.h> |
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#include <linux/mutex.h> |
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#include <asm/uaccess.h> #include <asm/semaphore.h> #include <asm/cacheflush.h> #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)) /* Protects module list */ static DEFINE_SPINLOCK(modlist_lock); /* List of modules, protected by module_mutex AND modlist_lock */ |
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static DEFINE_MUTEX(module_mutex); |
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static LIST_HEAD(modules); |
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static DEFINE_MUTEX(notify_mutex); |
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static struct notifier_block * module_notify_list; int register_module_notifier(struct notifier_block * nb) { int err; |
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mutex_lock(¬ify_mutex); |
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err = notifier_chain_register(&module_notify_list, nb); |
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mutex_unlock(¬ify_mutex); |
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return err; } EXPORT_SYMBOL(register_module_notifier); int unregister_module_notifier(struct notifier_block * nb) { int err; |
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mutex_lock(¬ify_mutex); |
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err = notifier_chain_unregister(&module_notify_list, nb); |
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mutex_unlock(¬ify_mutex); |
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return err; } EXPORT_SYMBOL(unregister_module_notifier); /* We require a truly strong try_module_get() */ static inline int strong_try_module_get(struct module *mod) { if (mod && mod->state == MODULE_STATE_COMING) return 0; return try_module_get(mod); } /* A thread that wants to hold a reference to a module only while it * is running can call ths to safely exit. * nfsd and lockd use this. */ void __module_put_and_exit(struct module *mod, long code) { module_put(mod); do_exit(code); } EXPORT_SYMBOL(__module_put_and_exit); /* 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; } /* Provided by the linker */ extern const struct kernel_symbol __start___ksymtab[]; extern const struct kernel_symbol __stop___ksymtab[]; extern const struct kernel_symbol __start___ksymtab_gpl[]; extern const struct kernel_symbol __stop___ksymtab_gpl[]; |
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extern const struct kernel_symbol __start___ksymtab_gpl_future[]; extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
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extern const unsigned long __start___kcrctab[]; extern const unsigned long __start___kcrctab_gpl[]; |
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extern const unsigned long __start___kcrctab_gpl_future[]; |
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#ifndef CONFIG_MODVERSIONS #define symversion(base, idx) NULL #else #define symversion(base, idx) ((base) ? ((base) + (idx)) : NULL) #endif |
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/* 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; } |
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/* Find a symbol, return value, crc and module which owns it */ static unsigned long __find_symbol(const char *name, struct module **owner, const unsigned long **crc, int gplok) { struct module *mod; |
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const struct kernel_symbol *ks; |
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/* Core kernel first. */ *owner = NULL; |
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ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); if (ks) { *crc = symversion(__start___kcrctab, (ks - __start___ksymtab)); return ks->value; |
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} if (gplok) { |
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ks = lookup_symbol(name, __start___ksymtab_gpl, __stop___ksymtab_gpl); if (ks) { *crc = symversion(__start___kcrctab_gpl, (ks - __start___ksymtab_gpl)); return ks->value; } |
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} |
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ks = lookup_symbol(name, __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future); if (ks) { if (!gplok) { printk(KERN_WARNING "Symbol %s is being used " "by a non-GPL module, which will not " "be allowed in the future ", name); printk(KERN_WARNING "Please see the file " "Documentation/feature-removal-schedule.txt " "in the kernel source tree for more " "details. "); } *crc = symversion(__start___kcrctab_gpl_future, (ks - __start___ksymtab_gpl_future)); return ks->value; } |
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/* Now try modules. */ list_for_each_entry(mod, &modules, list) { *owner = mod; |
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ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); if (ks) { *crc = symversion(mod->crcs, (ks - mod->syms)); return ks->value; } |
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if (gplok) { |
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ks = lookup_symbol(name, mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms); if (ks) { *crc = symversion(mod->gpl_crcs, (ks - mod->gpl_syms)); return ks->value; |
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} } |
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ks = lookup_symbol(name, mod->gpl_future_syms, (mod->gpl_future_syms + mod->num_gpl_future_syms)); if (ks) { if (!gplok) { printk(KERN_WARNING "Symbol %s is being used " "by a non-GPL module, which will not " "be allowed in the future ", name); printk(KERN_WARNING "Please see the file " "Documentation/feature-removal-schedule.txt " "in the kernel source tree for more " "details. "); } *crc = symversion(mod->gpl_future_crcs, (ks - mod->gpl_future_syms)); return ks->value; } |
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} DEBUGP("Failed to find symbol %s ", name); return 0; } |
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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) { int *new = kmalloc(sizeof(new[0]) * pcpu_num_allocated*2, GFP_KERNEL); if (!new) return 0; memcpy(new, pcpu_size, sizeof(new[0])*pcpu_num_allocated); pcpu_num_allocated *= 2; kfree(pcpu_size); 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; } /* Created by linker magic */ extern char __per_cpu_start[], __per_cpu_end[]; |
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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 > SMP_CACHE_BYTES) { printk(KERN_WARNING "%s: per-cpu alignment %li > %i ", name, align, SMP_CACHE_BYTES); align = SMP_CACHE_BYTES; } |
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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"); } 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). */ pcpu_size[0] = -ALIGN(__per_cpu_end-__per_cpu_start, SMP_CACHE_BYTES); /* 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; } __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) \ { \ kfree(mod->field); \ mod->field = NULL; \ } \ static struct module_attribute modinfo_##field = { \ .attr = { .name = __stringify(field), .mode = 0444, \ .owner = THIS_MODULE }, \ .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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#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; if (b == NULL || already_uses(a, b)) return 1; if (!strong_try_module_get(b)) 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); 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); /* There can be at most one match. */ break; } } } } #ifdef CONFIG_MODULE_FORCE_UNLOAD |
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static inline int try_force_unload(unsigned int flags) |
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{ int ret = (flags & O_TRUNC); if (ret) |
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add_taint(TAINT_FORCED_RMMOD); |
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return ret; } #else |
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static inline int try_force_unload(unsigned int flags) |
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{ 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; /* If it's not unused, quit unless we are told to block. */ if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) { |
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if (!(*sref->forced = try_force_unload(sref->flags))) |
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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) { struct stopref sref = { mod, flags, forced }; return stop_machine_run(__try_stop_module, &sref, NR_CPUS); } 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) { /* Since we might sleep for some time, drop the semaphore first */ |
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mutex_unlock(&module_mutex); |
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for (;;) { DEBUGP("Looking at refcount... "); set_current_state(TASK_UNINTERRUPTIBLE); if (module_refcount(mod) == 0) break; schedule(); } current->state = TASK_RUNNING; |
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mutex_lock(&module_mutex); |
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} asmlinkage long sys_delete_module(const char __user *name_user, unsigned int flags) { struct module *mod; char name[MODULE_NAME_LEN]; int ret, forced = 0; 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'; |
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if (mutex_lock_interruptible(&module_mutex) != 0) |
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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 */ if ((mod->init != NULL && mod->exit == NULL) || mod->unsafe) { |
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forced = try_force_unload(flags); |
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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); /* Final destruction now noone is using it. */ if (mod->exit != NULL) { |
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mutex_unlock(&module_mutex); |
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mod->exit(); |
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mutex_lock(&module_mutex); |
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} free_module(mod); out: |
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mutex_unlock(&module_mutex); |
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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); } if (mod->unsafe) { printed_something = 1; seq_printf(m, "[unsafe],"); } 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; unsigned long flags; const unsigned long *crc; spin_lock_irqsave(&modlist_lock, flags); if (!__find_symbol(symbol, &owner, &crc, 1)) BUG(); module_put(owner); spin_unlock_irqrestore(&modlist_lock, flags); } EXPORT_SYMBOL(__symbol_put); void symbol_put_addr(void *addr) { unsigned long flags; spin_lock_irqsave(&modlist_lock, flags); if (!kernel_text_address((unsigned long)addr)) BUG(); module_put(module_text_address((unsigned long)addr)); spin_unlock_irqrestore(&modlist_lock, flags); } EXPORT_SYMBOL_GPL(symbol_put_addr); static ssize_t show_refcnt(struct module_attribute *mattr, struct module *mod, char *buffer) { /* sysfs holds a reference */ return sprintf(buffer, "%u ", module_refcount(mod)-1); } static struct module_attribute refcnt = { .attr = { .name = "refcnt", .mode = 0444, .owner = THIS_MODULE }, .show = show_refcnt, }; #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) { return strong_try_module_get(b); } static inline void module_unload_init(struct module *mod) { } #endif /* CONFIG_MODULE_UNLOAD */ |
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static struct module_attribute *modinfo_attrs[] = { &modinfo_version, &modinfo_srcversion, #ifdef CONFIG_MODULE_UNLOAD &refcnt, #endif NULL, }; |
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776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 |
static const char vermagic[] = VERMAGIC_STRING; #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; 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; printk("%s: disagrees about version of symbol %s ", mod->name, symname); DEBUGP("Found checksum %lX vs module %lX ", *crc, versions[i].crc); return 0; } /* Not in module's version table. OK, but that taints the kernel. */ if (!(tainted & TAINT_FORCED_MODULE)) { printk("%s: no version for \"%s\" found: kernel tainted. ", mod->name, symname); |
9f1583339
|
815 |
add_taint(TAINT_FORCED_MODULE); |
1da177e4c
|
816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 |
} return 1; } static inline int check_modstruct_version(Elf_Shdr *sechdrs, unsigned int versindex, struct module *mod) { const unsigned long *crc; struct module *owner; if (!__find_symbol("struct_module", &owner, &crc, 1)) BUG(); return check_version(sechdrs, versindex, "struct_module", mod, crc); } /* First part is kernel version, which we ignore. */ static inline int same_magic(const char *amagic, const char *bmagic) { amagic += strcspn(amagic, " "); bmagic += strcspn(bmagic, " "); 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; } static inline int same_magic(const char *amagic, const char *bmagic) { 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; |
1da177e4c
|
873 874 875 876 877 878 879 |
ret = __find_symbol(name, &owner, &crc, mod->license_gplok); if (ret) { /* use_module can fail due to OOM, or module unloading */ if (!check_version(sechdrs, versindex, name, mod, crc) || !use_module(mod, owner)) ret = 0; } |
1da177e4c
|
880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 |
return ret; } /* * /sys/module/foo/sections stuff * J. Corbet <corbet@lwn.net> */ #ifdef CONFIG_KALLSYMS 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); } 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; /* 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]); if (! (sect_attrs = kmalloc(size[0] + size[1], GFP_KERNEL))) return; /* Setup section attributes. */ sect_attrs->grp.name = "sections"; sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; 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; strlcpy(sattr->name, secstrings + sechdrs[i].sh_name, MODULE_SECT_NAME_LEN); sattr->mattr.show = module_sect_show; sattr->mattr.store = NULL; sattr->mattr.attr.name = sattr->name; sattr->mattr.attr.owner = mod; 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: kfree(sect_attrs); } 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. */ kfree(mod->sect_attrs); mod->sect_attrs = NULL; } } #else 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) { } #endif /* CONFIG_KALLSYMS */ |
c988d2b28
|
970 971 972 |
static int module_add_modinfo_attrs(struct module *mod) { struct module_attribute *attr; |
03e88ae1b
|
973 |
struct module_attribute *temp_attr; |
c988d2b28
|
974 975 |
int error = 0; int i; |
03e88ae1b
|
976 977 978 979 980 981 982 |
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
|
983 984 |
for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { if (!attr->test || |
03e88ae1b
|
985 986 987 988 989 990 |
(attr->test && attr->test(mod))) { memcpy(temp_attr, attr, sizeof(*temp_attr)); temp_attr->attr.owner = mod; error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); ++temp_attr; } |
c988d2b28
|
991 992 993 994 995 996 997 998 |
} return error; } static void module_remove_modinfo_attrs(struct module *mod) { struct module_attribute *attr; int i; |
03e88ae1b
|
999 1000 1001 1002 |
for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { /* pick a field to test for end of list */ if (!attr->attr.name) break; |
c988d2b28
|
1003 |
sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1b
|
1004 1005 |
if (attr->free) attr->free(mod); |
c988d2b28
|
1006 |
} |
03e88ae1b
|
1007 |
kfree(mod->modinfo_attrs); |
c988d2b28
|
1008 |
} |
1da177e4c
|
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 |
static int mod_sysfs_setup(struct module *mod, struct kernel_param *kparam, unsigned int num_params) { int err; memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name); if (err) goto out; kobj_set_kset_s(&mod->mkobj, module_subsys); mod->mkobj.mod = mod; err = kobject_register(&mod->mkobj.kobj); if (err) goto out; |
1da177e4c
|
1025 1026 1027 |
err = module_param_sysfs_setup(mod, kparam, num_params); if (err) goto out_unreg; |
c988d2b28
|
1028 1029 1030 |
err = module_add_modinfo_attrs(mod); if (err) goto out_unreg; |
c988d2b28
|
1031 |
|
1da177e4c
|
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 |
return 0; out_unreg: kobject_unregister(&mod->mkobj.kobj); out: return err; } static void mod_kobject_remove(struct module *mod) { |
c988d2b28
|
1042 |
module_remove_modinfo_attrs(mod); |
1da177e4c
|
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 |
module_param_sysfs_remove(mod); kobject_unregister(&mod->mkobj.kobj); } /* * 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; } /* Free a module, remove from lists, etc (must hold module mutex). */ static void free_module(struct module *mod) { /* Delete from various lists */ stop_machine_run(__unlink_module, mod, NR_CPUS); remove_sect_attrs(mod); mod_kobject_remove(mod); /* Arch-specific cleanup. */ module_arch_cleanup(mod); /* Module unload stuff */ module_unload_free(mod); /* This may be NULL, but that's OK */ module_free(mod, mod->module_init); kfree(mod->args); if (mod->percpu) percpu_modfree(mod->percpu); /* Finally, free the core (containing the module structure) */ module_free(mod, mod->module_core); } void *__symbol_get(const char *symbol) { struct module *owner; unsigned long value, flags; const unsigned long *crc; spin_lock_irqsave(&modlist_lock, flags); value = __find_symbol(symbol, &owner, &crc, 1); if (value && !strong_try_module_get(owner)) value = 0; spin_unlock_irqrestore(&modlist_lock, flags); return (void *)value; } EXPORT_SYMBOL_GPL(__symbol_get); |
eea8b54dc
|
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 |
/* * Ensure that an exported symbol [global namespace] does not already exist * in the Kernel or in some other modules exported symbol table. */ static int verify_export_symbols(struct module *mod) { const char *name = NULL; unsigned long i, ret = 0; struct module *owner; const unsigned long *crc; for (i = 0; i < mod->num_syms; i++) if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) { name = mod->syms[i].name; ret = -ENOEXEC; goto dup; } for (i = 0; i < mod->num_gpl_syms; i++) if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) { name = mod->gpl_syms[i].name; ret = -ENOEXEC; goto dup; } dup: if (ret) printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s) ", mod->name, name, module_name(owner)); return ret; } |
1da177e4c
|
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 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 1182 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 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 |
/* Change all symbols so that sh_value encodes the pointer directly. */ 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. */ if (sym[i].st_value != 0) 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. */ static long get_offset(unsigned long *size, Elf_Shdr *sechdr) { 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; } } static inline int license_is_gpl_compatible(const char *license) { return (strcmp(license, "GPL") == 0 || strcmp(license, "GPL v2") == 0 || strcmp(license, "GPL and additional rights") == 0 || strcmp(license, "Dual BSD/GPL") == 0 || strcmp(license, "Dual MPL/GPL") == 0); } static void set_license(struct module *mod, const char *license) { if (!license) license = "unspecified"; mod->license_gplok = license_is_gpl_compatible(license); if (!mod->license_gplok && !(tainted & TAINT_PROPRIETARY_MODULE)) { printk(KERN_WARNING "%s: module license '%s' taints kernel. ", mod->name, license); |
9f1583339
|
1290 |
add_taint(TAINT_PROPRIETARY_MODULE); |
1da177e4c
|
1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 |
} } /* 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
|
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 |
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
|
1341 |
|
1da177e4c
|
1342 1343 1344 |
#ifdef CONFIG_KALLSYMS int is_exported(const char *name, const struct module *mod) { |
3fd6805f4
|
1345 1346 1347 1348 |
if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab)) return 1; else if (lookup_symbol(name, mod->syms, mod->syms + mod->num_syms)) |
1da177e4c
|
1349 |
return 1; |
3fd6805f4
|
1350 1351 |
else return 0; |
1da177e4c
|
1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 |
} /* 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 */ /* Allocate and load the module: note that size of section 0 is always zero, and we rely on this for optional sections. */ static struct module *load_module(void __user *umod, unsigned long len, const char __user *uargs) { Elf_Ehdr *hdr; Elf_Shdr *sechdrs; char *secstrings, *args, *modmagic, *strtab = NULL; unsigned int i, symindex = 0, strindex = 0, setupindex, exindex, exportindex, modindex, obsparmindex, infoindex, gplindex, |
9f28bb7e1
|
1433 1434 |
crcindex, gplcrcindex, versindex, pcpuindex, gplfutureindex, gplfuturecrcindex; |
1da177e4c
|
1435 1436 1437 1438 |
struct module *mod; long err = 0; void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ struct exception_table_entry *extable; |
378bac820
|
1439 |
mm_segment_t old_fs; |
1da177e4c
|
1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 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 |
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 */ if (memcmp(hdr->e_ident, ELFMAG, 4) != 0 || 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; } 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; } /* Optional sections */ exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab"); gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl"); |
9f28bb7e1
|
1517 |
gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future"); |
1da177e4c
|
1518 1519 |
crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab"); gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl"); |
9f28bb7e1
|
1520 |
gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future"); |
1da177e4c
|
1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 |
setupindex = find_sec(hdr, sechdrs, secstrings, "__param"); exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table"); obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm"); versindex = find_sec(hdr, sechdrs, secstrings, "__versions"); infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo"); pcpuindex = find_pcpusec(hdr, sechdrs, secstrings); /* Don't keep modinfo section */ sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; #ifdef CONFIG_KALLSYMS /* Keep symbol and string tables for decoding later. */ sechdrs[symindex].sh_flags |= SHF_ALLOC; sechdrs[strindex].sh_flags |= SHF_ALLOC; #endif /* Check module struct version now, before we try to use module. */ if (!check_modstruct_version(sechdrs, versindex, mod)) { err = -ENOEXEC; goto free_hdr; } modmagic = get_modinfo(sechdrs, infoindex, "vermagic"); /* This is allowed: modprobe --force will invalidate it. */ if (!modmagic) { |
9f1583339
|
1545 |
add_taint(TAINT_FORCED_MODULE); |
1da177e4c
|
1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 |
printk(KERN_WARNING "%s: no version magic, tainting kernel. ", mod->name); } else if (!same_magic(modmagic, vermagic)) { printk(KERN_ERR "%s: version magic '%s' should be '%s' ", mod->name, modmagic, vermagic); err = -ENOEXEC; goto free_hdr; } /* Now copy in args */ |
24277dda3
|
1558 1559 1560 |
args = strndup_user(uargs, ~0UL >> 1); if (IS_ERR(args)) { err = PTR_ERR(args); |
1da177e4c
|
1561 1562 |
goto free_hdr; } |
8e08b7568
|
1563 |
|
1da177e4c
|
1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 |
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
|
1579 1580 |
sechdrs[pcpuindex].sh_addralign, mod->name); |
1da177e4c
|
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 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 |
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. */ ptr = module_alloc(mod->core_size); if (!ptr) { err = -ENOMEM; goto free_percpu; } memset(ptr, 0, mod->core_size); mod->module_core = ptr; ptr = module_alloc(mod->init_size); 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); /* Set up license info based on the info section */ set_license(mod, get_modinfo(sechdrs, infoindex, "license")); |
9841d61d7
|
1642 1643 1644 1645 |
if (strcmp(mod->name, "ndiswrapper") == 0) add_taint(TAINT_PROPRIETARY_MODULE); if (strcmp(mod->name, "driverloader") == 0) add_taint(TAINT_PROPRIETARY_MODULE); |
c988d2b28
|
1646 1647 |
/* Set up MODINFO_ATTR fields */ setup_modinfo(mod, sechdrs, infoindex); |
c988d2b28
|
1648 |
|
1da177e4c
|
1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 |
/* 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; /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */ mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms); mod->syms = (void *)sechdrs[exportindex].sh_addr; if (crcindex) mod->crcs = (void *)sechdrs[crcindex].sh_addr; mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms); mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr; if (gplcrcindex) mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr; |
9f28bb7e1
|
1664 1665 1666 1667 1668 |
mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size / sizeof(*mod->gpl_future_syms); mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr; if (gplfuturecrcindex) mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr; |
1da177e4c
|
1669 1670 1671 |
#ifdef CONFIG_MODVERSIONS if ((mod->num_syms && !crcindex) || |
9f28bb7e1
|
1672 1673 |
(mod->num_gpl_syms && !gplcrcindex) || (mod->num_gpl_future_syms && !gplfuturecrcindex)) { |
1da177e4c
|
1674 1675 1676 |
printk(KERN_WARNING "%s: No versions for exported symbols." " Tainting kernel. ", mod->name); |
9f1583339
|
1677 |
add_taint(TAINT_FORCED_MODULE); |
1da177e4c
|
1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 |
} #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
|
1702 1703 1704 1705 1706 |
/* Find duplicate symbols */ err = verify_export_symbols(mod); if (err < 0) goto cleanup; |
1da177e4c
|
1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 |
/* Set up and sort exception table */ mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable); mod->extable = extable = (void *)sechdrs[exindex].sh_addr; sort_extable(extable, extable + mod->num_exentries); /* 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); err = module_finalize(hdr, sechdrs, mod); if (err < 0) goto cleanup; |
378bac820
|
1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 |
/* 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
|
1738 |
mod->args = args; |
8d3b33f67
|
1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 |
if (obsparmindex) printk(KERN_WARNING "%s: Ignoring obsolete parameters ", mod->name); /* Size of section 0 is 0, so this works well if no params */ err = parse_args(mod->name, mod->args, (struct kernel_param *) sechdrs[setupindex].sh_addr, sechdrs[setupindex].sh_size / sizeof(struct kernel_param), NULL); |
1da177e4c
|
1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 |
if (err < 0) goto arch_cleanup; err = mod_sysfs_setup(mod, (struct kernel_param *) sechdrs[setupindex].sh_addr, sechdrs[setupindex].sh_size / sizeof(struct kernel_param)); if (err < 0) goto arch_cleanup; add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); /* Get rid of temporary copy */ vfree(hdr); /* Done! */ return mod; arch_cleanup: module_arch_cleanup(mod); cleanup: 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
|
1783 |
return ERR_PTR(err); |
1da177e4c
|
1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 |
truncated: printk(KERN_ERR "Module len %lu truncated ", len); err = -ENOEXEC; goto free_hdr; } /* * link the module with the whole machine is stopped with interrupts off * - this defends against kallsyms not taking locks */ static int __link_module(void *_mod) { struct module *mod = _mod; list_add(&mod->list, &modules); return 0; } /* 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
|
1817 |
if (mutex_lock_interruptible(&module_mutex) != 0) |
1da177e4c
|
1818 1819 1820 1821 1822 |
return -EINTR; /* Do all the hard work */ mod = load_module(umod, len, uargs); if (IS_ERR(mod)) { |
6389a3851
|
1823 |
mutex_unlock(&module_mutex); |
1da177e4c
|
1824 1825 |
return PTR_ERR(mod); } |
1da177e4c
|
1826 1827 1828 1829 1830 |
/* Now sew it into the lists. They won't access us, since strong_try_module_get() will fail. */ stop_machine_run(__link_module, mod, NR_CPUS); /* Drop lock so they can recurse */ |
6389a3851
|
1831 |
mutex_unlock(&module_mutex); |
1da177e4c
|
1832 |
|
97d1f15b7
|
1833 |
mutex_lock(¬ify_mutex); |
1da177e4c
|
1834 |
notifier_call_chain(&module_notify_list, MODULE_STATE_COMING, mod); |
97d1f15b7
|
1835 |
mutex_unlock(¬ify_mutex); |
1da177e4c
|
1836 1837 1838 1839 1840 1841 1842 1843 |
/* Start the module */ if (mod->init != NULL) ret = mod->init(); if (ret < 0) { /* Init routine failed: abort. Try to protect us from buggy refcounters. */ mod->state = MODULE_STATE_GOING; |
fbd568a3e
|
1844 |
synchronize_sched(); |
1da177e4c
|
1845 1846 1847 1848 1849 1850 |
if (mod->unsafe) printk(KERN_ERR "%s: module is now stuck! ", mod->name); else { module_put(mod); |
6389a3851
|
1851 |
mutex_lock(&module_mutex); |
1da177e4c
|
1852 |
free_module(mod); |
6389a3851
|
1853 |
mutex_unlock(&module_mutex); |
1da177e4c
|
1854 1855 1856 1857 1858 |
} return ret; } /* Now it's a first class citizen! */ |
6389a3851
|
1859 |
mutex_lock(&module_mutex); |
1da177e4c
|
1860 1861 1862 1863 1864 1865 1866 |
mod->state = MODULE_STATE_LIVE; /* Drop initial reference. */ module_put(mod); module_free(mod, mod->module_init); mod->module_init = NULL; mod->init_size = 0; mod->init_text_size = 0; |
6389a3851
|
1867 |
mutex_unlock(&module_mutex); |
1da177e4c
|
1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 |
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 $d. */ static inline int is_arm_mapping_symbol(const char *str) { return str[0] == '$' && strchr("atd", str[1]) && (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; else nextval = (unsigned long)mod->module_core+mod->core_text_size; /* Scan for closest preceeding symbol, and next symbol. (ELF starts real symbols at 1). */ 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; *size = nextval - mod->symtab[best].st_value; *offset = addr - mod->symtab[best].st_value; return mod->strtab + mod->symtab[best].st_name; } /* For kallsyms to ask for address resolution. NULL means not found. We don't lock, as this is used for oops resolution and races are a lesser concern. */ const char *module_address_lookup(unsigned long addr, unsigned long *size, unsigned long *offset, char **modname) { struct module *mod; list_for_each_entry(mod, &modules, list) { if (within(addr, mod->module_init, mod->init_size) || within(addr, mod->module_core, mod->core_size)) { *modname = mod->name; return get_ksymbol(mod, addr, size, offset); } } return NULL; } struct module *module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, char namebuf[128]) { struct module *mod; |
6389a3851
|
1956 |
mutex_lock(&module_mutex); |
1da177e4c
|
1957 1958 1959 1960 1961 1962 1963 |
list_for_each_entry(mod, &modules, list) { if (symnum < mod->num_symtab) { *value = mod->symtab[symnum].st_value; *type = mod->symtab[symnum].st_info; strncpy(namebuf, mod->strtab + mod->symtab[symnum].st_name, 127); |
6389a3851
|
1964 |
mutex_unlock(&module_mutex); |
1da177e4c
|
1965 1966 1967 1968 |
return mod; } symnum -= mod->num_symtab; } |
6389a3851
|
1969 |
mutex_unlock(&module_mutex); |
1da177e4c
|
1970 1971 1972 1973 1974 1975 1976 1977 |
return NULL; } static unsigned long mod_find_symname(struct module *mod, const char *name) { unsigned int i; for (i = 0; i < mod->num_symtab; i++) |
54e8ce463
|
1978 1979 |
if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && mod->symtab[i].st_info != 'U') |
1da177e4c
|
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 |
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. */ if ((colon = strchr(name, ':')) != NULL) { *colon = '\0'; if ((mod = find_module(name)) != NULL) ret = mod_find_symname(mod, colon+1); *colon = ':'; } else { list_for_each_entry(mod, &modules, list) if ((ret = mod_find_symname(mod, name)) != 0) break; } return ret; } #endif /* CONFIG_KALLSYMS */ /* Called by the /proc file system to return a list of modules. */ static void *m_start(struct seq_file *m, loff_t *pos) { struct list_head *i; loff_t n = 0; |
6389a3851
|
2011 |
mutex_lock(&module_mutex); |
1da177e4c
|
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 |
list_for_each(i, &modules) { if (n++ == *pos) break; } if (i == &modules) return NULL; return i; } static void *m_next(struct seq_file *m, void *p, loff_t *pos) { struct list_head *i = p; (*pos)++; if (i->next == &modules) return NULL; return i->next; } static void m_stop(struct seq_file *m, void *p) { |
6389a3851
|
2032 |
mutex_unlock(&module_mutex); |
1da177e4c
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} static int m_show(struct seq_file *m, void *p) { struct module *mod = list_entry(p, struct module, list); seq_printf(m, "%s %lu", 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); 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 -. */ struct seq_operations modules_op = { .start = m_start, .next = m_next, .stop = m_stop, .show = m_show }; /* Given an address, look for it in the module exception tables. */ const struct exception_table_entry *search_module_extables(unsigned long addr) { unsigned long flags; const struct exception_table_entry *e = NULL; struct module *mod; spin_lock_irqsave(&modlist_lock, flags); list_for_each_entry(mod, &modules, list) { if (mod->num_exentries == 0) continue; e = search_extable(mod->extable, mod->extable + mod->num_exentries - 1, addr); if (e) break; } spin_unlock_irqrestore(&modlist_lock, flags); /* Now, if we found one, we are running inside it now, hence we cannot unload the module, hence no refcnt needed. */ return e; } /* Is this a valid kernel address? We don't grab the lock: we are oopsing. */ struct module *__module_text_address(unsigned long addr) { struct module *mod; list_for_each_entry(mod, &modules, list) 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; unsigned long flags; spin_lock_irqsave(&modlist_lock, flags); mod = __module_text_address(addr); spin_unlock_irqrestore(&modlist_lock, flags); return mod; } /* Don't grab lock, we're oopsing. */ void print_modules(void) { struct module *mod; printk("Modules linked in:"); list_for_each_entry(mod, &modules, list) printk(" %s", mod->name); printk(" "); } void module_add_driver(struct module *mod, struct device_driver *drv) { if (!mod || !drv) return; /* Don't check return code; this call is idempotent */ sysfs_create_link(&drv->kobj, &mod->mkobj.kobj, "module"); } EXPORT_SYMBOL(module_add_driver); void module_remove_driver(struct device_driver *drv) { if (!drv) return; sysfs_remove_link(&drv->kobj, "module"); } EXPORT_SYMBOL(module_remove_driver); #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 |