| /* |
| 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/module.h> |
| #include <linux/moduleloader.h> |
| #include <linux/init.h> |
| #include <linux/kallsyms.h> |
| #include <linux/sysfs.h> |
| #include <linux/kernel.h> |
| #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> |
| #include <linux/capability.h> |
| #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/sched.h> |
| #include <linux/stop_machine.h> |
| #include <linux/device.h> |
| #include <linux/string.h> |
| #include <linux/mutex.h> |
| #include <linux/unwind.h> |
| #include <asm/uaccess.h> |
| #include <asm/cacheflush.h> |
| #include <linux/license.h> |
| #include <asm/sections.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)) |
| |
| /* List of modules, protected by module_mutex or preempt_disable |
| * (add/delete uses stop_machine). */ |
| static DEFINE_MUTEX(module_mutex); |
| static LIST_HEAD(modules); |
| |
| /* Waiting for a module to finish initializing? */ |
| static DECLARE_WAIT_QUEUE_HEAD(module_wq); |
| |
| static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
| |
| int register_module_notifier(struct notifier_block * nb) |
| { |
| return blocking_notifier_chain_register(&module_notify_list, nb); |
| } |
| EXPORT_SYMBOL(register_module_notifier); |
| |
| int unregister_module_notifier(struct notifier_block * nb) |
| { |
| return blocking_notifier_chain_unregister(&module_notify_list, nb); |
| } |
| EXPORT_SYMBOL(unregister_module_notifier); |
| |
| /* We require a truly strong try_module_get(): 0 means failure due to |
| ongoing or failed initialization etc. */ |
| static inline int strong_try_module_get(struct module *mod) |
| { |
| if (mod && mod->state == MODULE_STATE_COMING) |
| return -EBUSY; |
| if (try_module_get(mod)) |
| return 0; |
| else |
| return -ENOENT; |
| } |
| |
| static inline void add_taint_module(struct module *mod, unsigned flag) |
| { |
| add_taint(flag); |
| mod->taints |= flag; |
| } |
| |
| /* |
| * 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. |
| */ |
| 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[]; |
| extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
| extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
| 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[]; |
| extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
| extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
| extern const unsigned long __start___kcrctab[]; |
| extern const unsigned long __start___kcrctab_gpl[]; |
| extern const unsigned long __start___kcrctab_gpl_future[]; |
| extern const unsigned long __start___kcrctab_unused[]; |
| extern const unsigned long __start___kcrctab_unused_gpl[]; |
| |
| #ifndef CONFIG_MODVERSIONS |
| #define symversion(base, idx) NULL |
| #else |
| #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
| #endif |
| |
| /* 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; |
| } |
| |
| static bool always_ok(bool gplok, bool warn, const char *name) |
| { |
| return true; |
| } |
| |
| static bool printk_unused_warning(bool gplok, bool warn, const char *name) |
| { |
| if (warn) { |
| printk(KERN_WARNING "Symbol %s is marked as UNUSED, " |
| "however this module is using it.\n", name); |
| printk(KERN_WARNING |
| "This symbol will go away in the future.\n"); |
| 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.\n"); |
| } |
| return true; |
| } |
| |
| static bool gpl_only_unused_warning(bool gplok, bool warn, const char *name) |
| { |
| if (!gplok) |
| return false; |
| return printk_unused_warning(gplok, warn, name); |
| } |
| |
| static bool gpl_only(bool gplok, bool warn, const char *name) |
| { |
| return gplok; |
| } |
| |
| static bool warn_if_not_gpl(bool gplok, bool warn, const char *name) |
| { |
| if (!gplok && warn) { |
| printk(KERN_WARNING "Symbol %s is being used " |
| "by a non-GPL module, which will not " |
| "be allowed in the future\n", name); |
| printk(KERN_WARNING "Please see the file " |
| "Documentation/feature-removal-schedule.txt " |
| "in the kernel source tree for more details.\n"); |
| } |
| return true; |
| } |
| |
| struct symsearch { |
| const struct kernel_symbol *start, *stop; |
| const unsigned long *crcs; |
| bool (*check)(bool gplok, bool warn, const char *name); |
| }; |
| |
| /* Look through this array of symbol tables for a symbol match which |
| * passes the check function. */ |
| static const struct kernel_symbol *search_symarrays(const struct symsearch *arr, |
| unsigned int num, |
| const char *name, |
| bool gplok, |
| bool warn, |
| const unsigned long **crc) |
| { |
| unsigned int i; |
| const struct kernel_symbol *ks; |
| |
| for (i = 0; i < num; i++) { |
| ks = lookup_symbol(name, arr[i].start, arr[i].stop); |
| if (!ks || !arr[i].check(gplok, warn, name)) |
| continue; |
| |
| if (crc) |
| *crc = symversion(arr[i].crcs, ks - arr[i].start); |
| return ks; |
| } |
| return NULL; |
| } |
| |
| /* 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 module *mod; |
| const struct kernel_symbol *ks; |
| const struct symsearch arr[] = { |
| { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
| always_ok }, |
| { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
| __start___kcrctab_gpl, gpl_only }, |
| { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
| __start___kcrctab_gpl_future, warn_if_not_gpl }, |
| { __start___ksymtab_unused, __stop___ksymtab_unused, |
| __start___kcrctab_unused, printk_unused_warning }, |
| { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
| __start___kcrctab_unused_gpl, gpl_only_unused_warning }, |
| }; |
| |
| /* Core kernel first. */ |
| ks = search_symarrays(arr, ARRAY_SIZE(arr), name, gplok, warn, crc); |
| if (ks) { |
| if (owner) |
| *owner = NULL; |
| return ks->value; |
| } |
| |
| /* Now try modules. */ |
| list_for_each_entry(mod, &modules, list) { |
| struct symsearch arr[] = { |
| { mod->syms, mod->syms + mod->num_syms, mod->crcs, |
| always_ok }, |
| { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
| mod->gpl_crcs, gpl_only }, |
| { mod->gpl_future_syms, |
| mod->gpl_future_syms + mod->num_gpl_future_syms, |
| mod->gpl_future_crcs, warn_if_not_gpl }, |
| { mod->unused_syms, |
| mod->unused_syms + mod->num_unused_syms, |
| mod->unused_crcs, printk_unused_warning }, |
| { mod->unused_gpl_syms, |
| mod->unused_gpl_syms + mod->num_unused_gpl_syms, |
| mod->unused_gpl_crcs, gpl_only_unused_warning }, |
| }; |
| |
| ks = search_symarrays(arr, ARRAY_SIZE(arr), |
| name, gplok, warn, crc); |
| if (ks) { |
| if (owner) |
| *owner = mod; |
| return ks->value; |
| } |
| } |
| |
| DEBUGP("Failed to find symbol %s\n", name); |
| return -ENOENT; |
| } |
| |
| /* 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; |
| |
| new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2, |
| GFP_KERNEL); |
| if (!new) |
| return 0; |
| |
| pcpu_num_allocated *= 2; |
| 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; |
| } |
| |
| static void *percpu_modalloc(unsigned long size, unsigned long align, |
| const char *name) |
| { |
| unsigned long extra; |
| unsigned int i; |
| void *ptr; |
| |
| if (align > PAGE_SIZE) { |
| printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", |
| name, align, PAGE_SIZE); |
| align = PAGE_SIZE; |
| } |
| |
| 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\n", |
| 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 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); |
| } |
| |
| 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] = -(__per_cpu_end-__per_cpu_start); |
| /* 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.\n"); |
| pcpu_num_used = 1; |
| } |
| |
| return 0; |
| } |
| __initcall(percpu_modinit); |
| #else /* ... !CONFIG_SMP */ |
| static inline void *percpu_modalloc(unsigned long size, unsigned long align, |
| const char *name) |
| { |
| 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 */ |
| |
| #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\n", 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 }, \ |
| .show = show_modinfo_##field, \ |
| .setup = setup_modinfo_##field, \ |
| .test = modinfo_##field##_exists, \ |
| .free = free_modinfo_##field, \ |
| }; |
| |
| MODINFO_ATTR(version); |
| MODINFO_ATTR(srcversion); |
| |
| static char last_unloaded_module[MODULE_NAME_LEN+1]; |
| |
| #ifdef CONFIG_MODULE_UNLOAD |
| /* 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. */ |
| local_set(&mod->ref[raw_smp_processor_id()].count, 1); |
| /* 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!\n", a->name, b->name); |
| return 1; |
| } |
| } |
| DEBUGP("%s does not use %s!\n", a->name, b->name); |
| return 0; |
| } |
| |
| /* Module a uses b */ |
| static int use_module(struct module *a, struct module *b) |
| { |
| struct module_use *use; |
| int no_warn, err; |
| |
| if (b == NULL || already_uses(a, b)) return 1; |
| |
| /* 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.\n", |
| a->name, b->name); |
| return 0; |
| } |
| |
| /* If strong_try_module_get() returned a different error, we fail. */ |
| if (err) |
| return 0; |
| |
| DEBUGP("Allocating new usage for %s.\n", a->name); |
| use = kmalloc(sizeof(*use), GFP_ATOMIC); |
| if (!use) { |
| printk("%s: out of memory loading\n", a->name); |
| module_put(b); |
| return 0; |
| } |
| |
| use->module_which_uses = a; |
| list_add(&use->list, &b->modules_which_use_me); |
| no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name); |
| 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\n", mod->name, i->name); |
| module_put(i); |
| list_del(&use->list); |
| kfree(use); |
| sysfs_remove_link(i->holders_dir, mod->name); |
| /* There can be at most one match. */ |
| break; |
| } |
| } |
| } |
| } |
| |
| #ifdef CONFIG_MODULE_FORCE_UNLOAD |
| static inline int try_force_unload(unsigned int flags) |
| { |
| int ret = (flags & O_TRUNC); |
| if (ret) |
| add_taint(TAINT_FORCED_RMMOD); |
| return ret; |
| } |
| #else |
| static inline int try_force_unload(unsigned int flags) |
| { |
| 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) { |
| if (!(*sref->forced = try_force_unload(sref->flags))) |
| 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, release the mutex first */ |
| mutex_unlock(&module_mutex); |
| for (;;) { |
| DEBUGP("Looking at refcount...\n"); |
| set_current_state(TASK_UNINTERRUPTIBLE); |
| if (module_refcount(mod) == 0) |
| break; |
| schedule(); |
| } |
| current->state = TASK_RUNNING; |
| mutex_lock(&module_mutex); |
| } |
| |
| 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'; |
| |
| if (mutex_lock_interruptible(&module_mutex) != 0) |
| 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\n", mod->name); |
| ret = -EBUSY; |
| goto out; |
| } |
| |
| /* If it has an init func, it must have an exit func to unload */ |
| if (mod->init && !mod->exit) { |
| forced = try_force_unload(flags); |
| 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); |
| |
| mutex_unlock(&module_mutex); |
| /* Final destruction now noone is using it. */ |
| if (mod->exit != NULL) |
| mod->exit(); |
| blocking_notifier_call_chain(&module_notify_list, |
| MODULE_STATE_GOING, mod); |
| mutex_lock(&module_mutex); |
| /* Store the name of the last unloaded module for diagnostic purposes */ |
| strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
| free_module(mod); |
| |
| out: |
| mutex_unlock(&module_mutex); |
| 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->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; |
| |
| preempt_disable(); |
| if (IS_ERR_VALUE(find_symbol(symbol, &owner, NULL, true, false))) |
| BUG(); |
| module_put(owner); |
| preempt_enable(); |
| } |
| EXPORT_SYMBOL(__symbol_put); |
| |
| void symbol_put_addr(void *addr) |
| { |
| struct module *modaddr; |
| |
| if (core_kernel_text((unsigned long)addr)) |
| return; |
| |
| if (!(modaddr = module_text_address((unsigned long)addr))) |
| BUG(); |
| module_put(modaddr); |
| } |
| EXPORT_SYMBOL_GPL(symbol_put_addr); |
| |
| static ssize_t show_refcnt(struct module_attribute *mattr, |
| struct module *mod, char *buffer) |
| { |
| return sprintf(buffer, "%u\n", module_refcount(mod)); |
| } |
| |
| static struct module_attribute refcnt = { |
| .attr = { .name = "refcnt", .mode = 0444 }, |
| .show = show_refcnt, |
| }; |
| |
| 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); |
| |
| #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) == 0; |
| } |
| |
| static inline void module_unload_init(struct module *mod) |
| { |
| } |
| #endif /* CONFIG_MODULE_UNLOAD */ |
| |
| 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\n", state); |
| } |
| |
| static struct module_attribute initstate = { |
| .attr = { .name = "initstate", .mode = 0444 }, |
| .show = show_initstate, |
| }; |
| |
| static struct module_attribute *modinfo_attrs[] = { |
| &modinfo_version, |
| &modinfo_srcversion, |
| &initstate, |
| #ifdef CONFIG_MODULE_UNLOAD |
| &refcnt, |
| #endif |
| NULL, |
| }; |
| |
| static const char vermagic[] = VERMAGIC_STRING; |
| |
| static int try_to_force_load(struct module *mod, const char *symname) |
| { |
| #ifdef CONFIG_MODULE_FORCE_LOAD |
| if (!(tainted & TAINT_FORCED_MODULE)) |
| printk("%s: no version for \"%s\" found: kernel tainted.\n", |
| mod->name, symname); |
| add_taint_module(mod, TAINT_FORCED_MODULE); |
| return 0; |
| #else |
| return -ENOEXEC; |
| #endif |
| } |
| |
| #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; |
| |
| /* No versions at all? modprobe --force does this. */ |
| if (versindex == 0) |
| return try_to_force_load(mod, symname) == 0; |
| |
| 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; |
| DEBUGP("Found checksum %lX vs module %lX\n", |
| *crc, versions[i].crc); |
| goto bad_version; |
| } |
| |
| printk(KERN_WARNING "%s: no symbol version for %s\n", |
| mod->name, symname); |
| return 0; |
| |
| bad_version: |
| printk("%s: disagrees about version of symbol %s\n", |
| mod->name, symname); |
| return 0; |
| } |
| |
| static inline int check_modstruct_version(Elf_Shdr *sechdrs, |
| unsigned int versindex, |
| struct module *mod) |
| { |
| const unsigned long *crc; |
| |
| if (IS_ERR_VALUE(find_symbol("struct_module", NULL, &crc, true, false))) |
| BUG(); |
| return check_version(sechdrs, versindex, "struct_module", mod, crc); |
| } |
| |
| /* 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) |
| { |
| if (has_crcs) { |
| 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, |
| bool has_crcs) |
| { |
| 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; |
| |
| ret = find_symbol(name, &owner, &crc, |
| !(mod->taints & TAINT_PROPRIETARY_MODULE), true); |
| if (!IS_ERR_VALUE(ret)) { |
| /* use_module can fail due to OOM, |
| or module initialization or unloading */ |
| if (!check_version(sechdrs, versindex, name, mod, crc) || |
| !use_module(mod, owner)) |
| ret = -EINVAL; |
| } |
| return ret; |
| } |
| |
| /* |
| * /sys/module/foo/sections stuff |
| * J. Corbet <corbet@lwn.net> |
| */ |
| #if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS) |
| 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]; |
| }; |
| |
| 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\n", sattr->address); |
| } |
| |
| static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
| { |
| unsigned int section; |
| |
| for (section = 0; section < sect_attrs->nsections; section++) |
| kfree(sect_attrs->attrs[section].name); |
| kfree(sect_attrs); |
| } |
| |
| 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]); |
| sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
| if (sect_attrs == NULL) |
| return; |
| |
| /* Setup section attributes. */ |
| sect_attrs->grp.name = "sections"; |
| sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; |
| |
| sect_attrs->nsections = 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; |
| sattr->name = kstrdup(secstrings + sechdrs[i].sh_name, |
| GFP_KERNEL); |
| if (sattr->name == NULL) |
| goto out; |
| sect_attrs->nsections++; |
| sattr->mattr.show = module_sect_show; |
| sattr->mattr.store = NULL; |
| sattr->mattr.attr.name = sattr->name; |
| 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: |
| free_sect_attrs(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. */ |
| free_sect_attrs(mod->sect_attrs); |
| mod->sect_attrs = NULL; |
| } |
| } |
| |
| /* |
| * /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]); |
| kobject_del(notes_attrs->dir); |
| } |
| 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; |
| } |
| |
| notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
| 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); |
| } |
| |
| #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) |
| { |
| } |
| |
| 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) |
| { |
| } |
| #endif |
| |
| #ifdef CONFIG_SYSFS |
| int module_add_modinfo_attrs(struct module *mod) |
| { |
| struct module_attribute *attr; |
| struct module_attribute *temp_attr; |
| int error = 0; |
| int i; |
| |
| 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; |
| for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
| if (!attr->test || |
| (attr->test && attr->test(mod))) { |
| memcpy(temp_attr, attr, sizeof(*temp_attr)); |
| error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
| ++temp_attr; |
| } |
| } |
| return error; |
| } |
| |
| void module_remove_modinfo_attrs(struct module *mod) |
| { |
| struct module_attribute *attr; |
| int i; |
| |
| for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
| /* pick a field to test for end of list */ |
| if (!attr->attr.name) |
| break; |
| sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
| if (attr->free) |
| attr->free(mod); |
| } |
| kfree(mod->modinfo_attrs); |
| } |
| |
| int mod_sysfs_init(struct module *mod) |
| { |
| int err; |
| struct kobject *kobj; |
| |
| if (!module_sysfs_initialized) { |
| printk(KERN_ERR "%s: module sysfs not initialized\n", |
| mod->name); |
| err = -EINVAL; |
| goto out; |
| } |
| |
| kobj = kset_find_obj(module_kset, mod->name); |
| if (kobj) { |
| printk(KERN_ERR "%s: module is already loaded\n", mod->name); |
| kobject_put(kobj); |
| err = -EINVAL; |
| goto out; |
| } |
| |
| mod->mkobj.mod = mod; |
| |
| 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); |
| |
| /* delay uevent until full sysfs population */ |
| out: |
| return err; |
| } |
| |
| int mod_sysfs_setup(struct module *mod, |
| struct kernel_param *kparam, |
| unsigned int num_params) |
| { |
| int err; |
| |
| mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
| if (!mod->holders_dir) { |
| err = -ENOMEM; |
| goto out_unreg; |
| } |
| |
| err = module_param_sysfs_setup(mod, kparam, num_params); |
| if (err) |
| goto out_unreg_holders; |
| |
| err = module_add_modinfo_attrs(mod); |
| if (err) |
| goto out_unreg_param; |
| |
| kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
| return 0; |
| |
| out_unreg_param: |
| module_param_sysfs_remove(mod); |
| out_unreg_holders: |
| kobject_put(mod->holders_dir); |
| out_unreg: |
| kobject_put(&mod->mkobj.kobj); |
| return err; |
| } |
| |
| 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 */ |
| |
| static void mod_kobject_remove(struct module *mod) |
| { |
| module_remove_modinfo_attrs(mod); |
| module_param_sysfs_remove(mod); |
| kobject_put(mod->mkobj.drivers_dir); |
| kobject_put(mod->holders_dir); |
| mod_sysfs_fini(mod); |
| } |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * 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_notes_attrs(mod); |
| remove_sect_attrs(mod); |
| mod_kobject_remove(mod); |
| |
| unwind_remove_table(mod->unwind_info, 0); |
| |
| /* 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); |
| |
| /* Free lock-classes: */ |
| lockdep_free_key_range(mod->module_core, mod->core_size); |
| |
| /* 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; |
| |
| preempt_disable(); |
| value = find_symbol(symbol, &owner, NULL, true, true); |
| if (IS_ERR_VALUE(value)) |
| value = 0; |
| else if (strong_try_module_get(owner)) |
| value = 0; |
| preempt_enable(); |
| |
| return (void *)value; |
| } |
| EXPORT_SYMBOL_GPL(__symbol_get); |
| |
| /* |
| * Ensure that an exported symbol [global namespace] does not already exist |
| * in the kernel or in some other module's exported symbol table. |
| */ |
| static int verify_export_symbols(struct module *mod) |
| { |
| unsigned int i; |
| struct module *owner; |
| 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 }, |
| { mod->unused_syms, mod->num_unused_syms }, |
| { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, |
| }; |
| |
| 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)\n", |
| mod->name, s->name, module_name(owner)); |
| return -ENOEXEC; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| /* Change all symbols so that st_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\n", strtab + sym[i].st_name); |
| printk("%s: please compile with -fno-common\n", |
| mod->name); |
| ret = -ENOEXEC; |
| break; |
| |
| case SHN_ABS: |
| /* Don't need to do anything */ |
| DEBUGP("Absolute symbol: 0x%08lx\n", |
| (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 (!IS_ERR_VALUE(sym[i].st_value)) |
| break; |
| /* Ok if weak. */ |
| if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
| break; |
| |
| printk(KERN_WARNING "%s: Unknown symbol %s\n", |
| 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:\n"); |
| 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\n", secstrings + s->sh_name); |
| } |
| if (m == 0) |
| mod->core_text_size = mod->core_size; |
| } |
| |
| DEBUGP("Init section allocation order:\n"); |
| 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\n", secstrings + s->sh_name); |
| } |
| if (m == 0) |
| mod->init_text_size = mod->init_size; |
| } |
| } |
| |
| static void set_license(struct module *mod, const char *license) |
| { |
| if (!license) |
| license = "unspecified"; |
| |
| if (!license_is_gpl_compatible(license)) { |
| if (!(tainted & TAINT_PROPRIETARY_MODULE)) |
| printk(KERN_WARNING "%s: module license '%s' taints " |
| "kernel.\n", mod->name, license); |
| add_taint_module(mod, TAINT_PROPRIETARY_MODULE); |
| } |
| } |
| |
| /* 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; |
| } |
| |
| 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)); |
| } |
| } |
| |
| #ifdef CONFIG_KALLSYMS |
| static int is_exported(const char *name, const struct module *mod) |
| { |
| if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab)) |
| return 1; |
| else |
| if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms)) |
| return 1; |
| else |
| return 0; |
| } |
| |
| /* 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; |
| unsigned int symindex = 0; |
| unsigned int strindex = 0; |
| unsigned int setupindex; |
| unsigned int exindex; |
| unsigned int exportindex; |
| unsigned int modindex; |
| unsigned int obsparmindex; |
| unsigned int infoindex; |
| unsigned int gplindex; |
| unsigned int crcindex; |
| unsigned int gplcrcindex; |
| unsigned int versindex; |
| unsigned int pcpuindex; |
| unsigned int gplfutureindex; |
| unsigned int gplfuturecrcindex; |
| unsigned int unwindex = 0; |
| unsigned int unusedindex; |
| unsigned int unusedcrcindex; |
| unsigned int unusedgplindex; |
| unsigned int unusedgplcrcindex; |
| unsigned int markersindex; |
| unsigned int markersstringsindex; |
| struct module *mod; |
| long err = 0; |
| void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */ |
| struct exception_table_entry *extable; |
| mm_segment_t old_fs; |
| |
| DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n", |
| 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, SELFMAG) != 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\n"); |
| err = -ENOEXEC; |
| goto free_hdr; |
| } |
| mod = (void *)sechdrs[modindex].sh_addr; |
| |
| if (symindex == 0) { |
| printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", |
| mod->name); |
| err = -ENOEXEC; |
| goto free_hdr; |
| } |
| |
| /* Optional sections */ |
| exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab"); |
| gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl"); |
| gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future"); |
| unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused"); |
| unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl"); |
| crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab"); |
| gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl"); |
| gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future"); |
| unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused"); |
| unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl"); |
| 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); |
| #ifdef ARCH_UNWIND_SECTION_NAME |
| unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME); |
| #endif |
| |
| /* Don't keep modinfo and version sections. */ |
| sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC; |
| sechdrs[versindex].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 |
| if (unwindex) |
| sechdrs[unwindex].sh_flags |= SHF_ALLOC; |
| |
| /* 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) { |
| err = try_to_force_load(mod, "magic"); |
| if (err) |
| goto free_hdr; |
| } else if (!same_magic(modmagic, vermagic, versindex)) { |
| printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
| mod->name, modmagic, vermagic); |
| err = -ENOEXEC; |
| goto free_hdr; |
| } |
| |
| /* Now copy in args */ |
| args = strndup_user(uargs, ~0UL >> 1); |
| if (IS_ERR(args)) { |
| err = PTR_ERR(args); |
| goto free_hdr; |
| } |
| |
| 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, |
| sechdrs[pcpuindex].sh_addralign, |
| mod->name); |
| 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:\n"); |
| 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\n", 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); |
| |
| /* add kobject, so we can reference it. */ |
| err = mod_sysfs_init(mod); |
| if (err) |
| goto free_unload; |
| |
| /* Set up license info based on the info section */ |
| set_license(mod, get_modinfo(sechdrs, infoindex, "license")); |
| |
| /* |
| * ndiswrapper is under GPL by itself, but loads proprietary modules. |
| * Don't use add_taint_module(), as it would prevent ndiswrapper from |
| * using GPL-only symbols it needs. |
| */ |
| if (strcmp(mod->name, "ndiswrapper") == 0) |
| add_taint(TAINT_PROPRIETARY_MODULE); |
| |
| /* driverloader was caught wrongly pretending to be under GPL */ |
| if (strcmp(mod->name, "driverloader") == 0) |
| add_taint_module(mod, TAINT_PROPRIETARY_MODULE); |
| |
| /* Set up MODINFO_ATTR fields */ |
| setup_modinfo(mod, sechdrs, infoindex); |
| |
| /* 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; |
| mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size / |
| sizeof(*mod->gpl_future_syms); |
| mod->num_unused_syms = sechdrs[unusedindex].sh_size / |
| sizeof(*mod->unused_syms); |
| mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size / |
| sizeof(*mod->unused_gpl_syms); |
| mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr; |
| if (gplfuturecrcindex) |
| mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr; |
| |
| mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr; |
| if (unusedcrcindex) |
| mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr; |
| mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr; |
| if (unusedgplcrcindex) |
| mod->unused_gpl_crcs |
| = (void *)sechdrs[unusedgplcrcindex].sh_addr; |
| |
| #ifdef CONFIG_MODVERSIONS |
| if ((mod->num_syms && !crcindex) || |
| (mod->num_gpl_syms && !gplcrcindex) || |
| (mod->num_gpl_future_syms && !gplfuturecrcindex) || |
| (mod->num_unused_syms && !unusedcrcindex) || |
| (mod->num_unused_gpl_syms && !unusedgplcrcindex)) { |
| printk(KERN_WARNING "%s: No versions for exported symbols.\n", mod->name); |
| err = try_to_force_load(mod, "nocrc"); |
| if (err) |
| goto cleanup; |
| } |
| #endif |
| markersindex = find_sec(hdr, sechdrs, secstrings, "__markers"); |
| markersstringsindex = find_sec(hdr, sechdrs, secstrings, |
| "__markers_strings"); |
| |
| /* 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; |
| } |
| #ifdef CONFIG_MARKERS |
| mod->markers = (void *)sechdrs[markersindex].sh_addr; |
| mod->num_markers = |
| sechdrs[markersindex].sh_size / sizeof(*mod->markers); |
| #endif |
| |
| /* Find duplicate symbols */ |
| err = verify_export_symbols(mod); |
| |
| if (err < 0) |
| goto cleanup; |
| |
| /* 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); |
| |
| #ifdef CONFIG_MARKERS |
| if (!mod->taints) |
| marker_update_probe_range(mod->markers, |
| mod->markers + mod->num_markers); |
| #endif |
| err = module_finalize(hdr, sechdrs, mod); |
| if (err < 0) |
| goto cleanup; |
| |
| /* 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); |
| |
| mod->args = args; |
| if (obsparmindex) |
| printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
| mod->name); |
| |
| /* Now sew it into the lists so we can get lockdep and oops |
| * info during argument parsing. Noone should access us, since |
| * strong_try_module_get() will fail. */ |
| stop_machine_run(__link_module, mod, NR_CPUS); |
| |
| /* 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); |
| if (err < 0) |
| goto unlink; |
| |
| err = mod_sysfs_setup(mod, |
| (struct kernel_param *) |
| sechdrs[setupindex].sh_addr, |
| sechdrs[setupindex].sh_size |
| / sizeof(struct kernel_param)); |
| if (err < 0) |
| goto unlink; |
| add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
| add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs); |
| |
| /* Size of section 0 is 0, so this works well if no unwind info. */ |
| mod->unwind_info = unwind_add_table(mod, |
| (void *)sechdrs[unwindex].sh_addr, |
| sechdrs[unwindex].sh_size); |
| |
| /* Get rid of temporary copy */ |
| vfree(hdr); |
| |
| /* Done! */ |
| return mod; |
| |
| unlink: |
| stop_machine_run(__unlink_module, mod, NR_CPUS); |
| module_arch_cleanup(mod); |
| cleanup: |
| kobject_del(&mod->mkobj.kobj); |
| kobject_put(&mod->mkobj.kobj); |
| free_unload: |
| 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); |
| return ERR_PTR(err); |
| |
| truncated: |
| printk(KERN_ERR "Module len %lu truncated\n", len); |
| err = -ENOEXEC; |
| goto free_hdr; |
| } |
| |
| /* 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 */ |
| if (mutex_lock_interruptible(&module_mutex) != 0) |
| return -EINTR; |
| |
| /* Do all the hard work */ |
| mod = load_module(umod, len, uargs); |
| if (IS_ERR(mod)) { |
| mutex_unlock(&module_mutex); |
| return PTR_ERR(mod); |
| } |
| |
| /* Drop lock so they can recurse */ |
| mutex_unlock(&module_mutex); |
| |
| blocking_notifier_call_chain(&module_notify_list, |
| MODULE_STATE_COMING, mod); |
| |
| /* 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; |
| synchronize_sched(); |
| module_put(mod); |
| blocking_notifier_call_chain(&module_notify_list, |
| MODULE_STATE_GOING, mod); |
| mutex_lock(&module_mutex); |
| free_module(mod); |
| mutex_unlock(&module_mutex); |
| wake_up(&module_wq); |
| return ret; |
| } |
| if (ret > 0) { |
| printk(KERN_WARNING "%s: '%s'->init suspiciously returned %d, " |
| "it should follow 0/-E convention\n" |
| KERN_WARNING "%s: loading module anyway...\n", |
| __func__, mod->name, ret, |
| __func__); |
| dump_stack(); |
| } |
| |
| /* Now it's a first class citizen! Wake up anyone waiting for it. */ |
| mod->state = MODULE_STATE_LIVE; |
| wake_up(&module_wq); |
| |
| mutex_lock(&module_mutex); |
| /* Drop initial reference. */ |
| module_put(mod); |
| unwind_remove_table(mod->unwind_info, 1); |
| module_free(mod, mod->module_init); |
| mod->module_init = NULL; |
| mod->init_size = 0; |
| mod->init_text_size = 0; |
| mutex_unlock(&module_mutex); |
| |
| 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; |
| |
| if (size) |
| *size = nextval - mod->symtab[best].st_value; |
| if (offset) |
| *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. Careful |
| * not to lock to avoid deadlock on oopses, simply disable preemption. */ |
| const char *module_address_lookup(unsigned long addr, |
| unsigned long *size, |
| unsigned long *offset, |
| char **modname, |
| char *namebuf) |
| { |
| struct module *mod; |
| const char *ret = NULL; |
| |
| preempt_disable(); |
| list_for_each_entry(mod, &modules, list) { |
| if (within(addr, mod->module_init, mod->init_size) |
| || within(addr, mod->module_core, mod->core_size)) { |
| if (modname) |
| *modname = mod->name; |
| ret = get_ksymbol(mod, addr, size, offset); |
| break; |
| } |
| } |
| /* Make a copy in here where it's safe */ |
| if (ret) { |
| strncpy(namebuf, ret, KSYM_NAME_LEN - 1); |
| ret = namebuf; |
| } |
| preempt_enable(); |
| return ret; |
| } |
| |
| int lookup_module_symbol_name(unsigned long addr, char *symname) |
| { |
| struct module *mod; |
| |
| preempt_disable(); |
| list_for_each_entry(mod, &modules, list) { |
| 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; |
| strlcpy(symname, sym, KSYM_NAME_LEN); |
| preempt_enable(); |
| return 0; |
| } |
| } |
| out: |
| preempt_enable(); |
| return -ERANGE; |
| } |
| |
| int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
| unsigned long *offset, char *modname, char *name) |
| { |
| struct module *mod; |
| |
| preempt_disable(); |
| list_for_each_entry(mod, &modules, list) { |
| 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) |
| strlcpy(modname, mod->name, MODULE_NAME_LEN); |
| if (name) |
| strlcpy(name, sym, KSYM_NAME_LEN); |
| preempt_enable(); |
| return 0; |
| } |
| } |
| out: |
| preempt_enable(); |
| return -ERANGE; |
| } |
| |
| int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
| char *name, char *module_name, int *exported) |
| { |
| struct module *mod; |
| |
| preempt_disable(); |
| list_for_each_entry(mod, &modules, list) { |
| if (symnum < mod->num_symtab) { |
| *value = mod->symtab[symnum].st_value; |
| *type = mod->symtab[symnum].st_info; |
| strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
| KSYM_NAME_LEN); |
| strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
| *exported = is_exported(name, mod); |
| preempt_enable(); |
| return 0; |
| } |
| symnum -= mod->num_symtab; |
| } |
| preempt_enable(); |
| return -ERANGE; |
| } |
| |
| static unsigned long mod_find_symname(struct module *mod, const char *name) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < mod->num_symtab; i++) |
| if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
| mod->symtab[i].st_info != 'U') |
| 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. */ |
| preempt_disable(); |
| 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; |
| } |
| preempt_enable(); |
| 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) |
| { |
| 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); |
| } |
| |
| static char *module_flags(struct module *mod, char *buf) |
| { |
| int bx = 0; |
| |
| if (mod->taints || |
| mod->state == MODULE_STATE_GOING || |
| mod->state == MODULE_STATE_COMING) { |
| buf[bx++] = '('; |
| if (mod->taints & TAINT_PROPRIETARY_MODULE) |
| buf[bx++] = 'P'; |
| if (mod->taints & TAINT_FORCED_MODULE) |
| buf[bx++] = 'F'; |
| /* |
| * TAINT_FORCED_RMMOD: could be added. |
| * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't |
| * apply to modules. |
| */ |
| |
| /* 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++] = '+'; |
| buf[bx++] = ')'; |
| } |
| buf[bx] = '\0'; |
| |
| return buf; |
| } |
| |
| static int m_show(struct seq_file *m, void *p) |
| { |
| struct module *mod = list_entry(p, struct module, list); |
| char buf[8]; |
| |
| 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); |
| |
| /* Taints info */ |
| if (mod->taints) |
| seq_printf(m, " %s", module_flags(mod, buf)); |
| |
| seq_printf(m, "\n"); |
| return 0; |
| } |
| |
| /* Format: modulename size refcount deps address |
| |
| Where refcount is a number or -, and deps is a comma-separated list |
| of depends or -. |
| */ |
| const 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) |
| { |
| const struct exception_table_entry *e = NULL; |
| struct module *mod; |
| |
| preempt_disable(); |
| 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; |
| } |
| preempt_enable(); |
| |
| /* 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 module address? |
| */ |
| int is_module_address(unsigned long addr) |
| { |
| struct module *mod; |
| |
| preempt_disable(); |
| |
| list_for_each_entry(mod, &modules, list) { |
| if (within(addr, mod->module_core, mod->core_size)) { |
| preempt_enable(); |
| return 1; |
| } |
| } |
| |
| preempt_enable(); |
| |
| return 0; |
| } |
| |
| |
| /* Is this a valid kernel address? */ |
| 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; |
| |
| preempt_disable(); |
| mod = __module_text_address(addr); |
| preempt_enable(); |
| |
| return mod; |
| } |
| |
| /* Don't grab lock, we're oopsing. */ |
| void print_modules(void) |
| { |
| struct module *mod; |
| char buf[8]; |
| |
| printk("Modules linked in:"); |
| list_for_each_entry(mod, &modules, list) |
| printk(" %s%s", mod->name, module_flags(mod, buf)); |
| if (last_unloaded_module[0]) |
| printk(" [last unloaded: %s]", last_unloaded_module); |
| printk("\n"); |
| } |
| |
| #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 |
| |
| #ifdef CONFIG_MARKERS |
| void module_update_markers(void) |
| { |
| struct module *mod; |
| |
| mutex_lock(&module_mutex); |
| list_for_each_entry(mod, &modules, list) |
| if (!mod->taints) |
| marker_update_probe_range(mod->markers, |
| mod->markers + mod->num_markers); |
| mutex_unlock(&module_mutex); |
| } |
| #endif |