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kernel/module.c
103 KB
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/* |
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Copyright (C) 2002 Richard Henderson |
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Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
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This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ |
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#include <linux/export.h> |
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#include <linux/moduleloader.h> |
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#include <linux/trace_events.h> |
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#include <linux/init.h> |
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#include <linux/kallsyms.h> |
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#include <linux/file.h> |
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#include <linux/fs.h> |
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#include <linux/sysfs.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/elf.h> |
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#include <linux/proc_fs.h> |
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#include <linux/security.h> |
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#include <linux/seq_file.h> #include <linux/syscalls.h> #include <linux/fcntl.h> #include <linux/rcupdate.h> |
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#include <linux/capability.h> |
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#include <linux/cpu.h> #include <linux/moduleparam.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/vermagic.h> #include <linux/notifier.h> |
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#include <linux/sched.h> |
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#include <linux/device.h> |
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#include <linux/string.h> |
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#include <linux/mutex.h> |
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#include <linux/rculist.h> |
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#include <asm/uaccess.h> |
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#include <asm/cacheflush.h> |
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#include <asm/mmu_context.h> |
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#include <linux/license.h> |
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#include <asm/sections.h> |
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#include <linux/tracepoint.h> |
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#include <linux/ftrace.h> |
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#include <linux/async.h> |
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#include <linux/percpu.h> |
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#include <linux/kmemleak.h> |
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#include <linux/jump_label.h> |
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#include <linux/pfn.h> |
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#include <linux/bsearch.h> |
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#include <uapi/linux/module.h> |
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#include "module-internal.h" |
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#define CREATE_TRACE_POINTS #include <trace/events/module.h> |
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#ifndef ARCH_SHF_SMALL #define ARCH_SHF_SMALL 0 #endif |
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/* * Modules' sections will be aligned on page boundaries * to ensure complete separation of code and data, but * only when CONFIG_DEBUG_SET_MODULE_RONX=y */ #ifdef CONFIG_DEBUG_SET_MODULE_RONX # define debug_align(X) ALIGN(X, PAGE_SIZE) #else # define debug_align(X) (X) #endif |
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/* If this is set, the section belongs in the init part of the module */ #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) |
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/* * Mutex protects: * 1) List of modules (also safely readable with preempt_disable), * 2) module_use links, * 3) module_addr_min/module_addr_max. |
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* (delete and add uses RCU list operations). */ |
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DEFINE_MUTEX(module_mutex); EXPORT_SYMBOL_GPL(module_mutex); |
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static LIST_HEAD(modules); |
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#ifdef CONFIG_MODULES_TREE_LOOKUP |
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/* * Use a latched RB-tree for __module_address(); this allows us to use * RCU-sched lookups of the address from any context. * |
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* This is conditional on PERF_EVENTS || TRACING because those can really hit * __module_address() hard by doing a lot of stack unwinding; potentially from * NMI context. |
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*/ static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) |
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{ |
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struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
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return (unsigned long)layout->base; |
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} static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) { |
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struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
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return (unsigned long)layout->size; |
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} static __always_inline bool mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) { return __mod_tree_val(a) < __mod_tree_val(b); } static __always_inline int mod_tree_comp(void *key, struct latch_tree_node *n) { unsigned long val = (unsigned long)key; unsigned long start, end; start = __mod_tree_val(n); if (val < start) return -1; end = start + __mod_tree_size(n); if (val >= end) return 1; |
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return 0; } |
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static const struct latch_tree_ops mod_tree_ops = { .less = mod_tree_less, .comp = mod_tree_comp, }; |
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static struct mod_tree_root { struct latch_tree_root root; unsigned long addr_min; unsigned long addr_max; } mod_tree __cacheline_aligned = { .addr_min = -1UL, |
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}; |
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#define module_addr_min mod_tree.addr_min #define module_addr_max mod_tree.addr_max static noinline void __mod_tree_insert(struct mod_tree_node *node) { latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); } static void __mod_tree_remove(struct mod_tree_node *node) { latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); } |
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/* * These modifications: insert, remove_init and remove; are serialized by the * module_mutex. */ static void mod_tree_insert(struct module *mod) { |
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mod->core_layout.mtn.mod = mod; mod->init_layout.mtn.mod = mod; |
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__mod_tree_insert(&mod->core_layout.mtn); if (mod->init_layout.size) __mod_tree_insert(&mod->init_layout.mtn); |
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} static void mod_tree_remove_init(struct module *mod) { |
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if (mod->init_layout.size) __mod_tree_remove(&mod->init_layout.mtn); |
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} static void mod_tree_remove(struct module *mod) { |
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__mod_tree_remove(&mod->core_layout.mtn); |
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mod_tree_remove_init(mod); } |
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static struct module *mod_find(unsigned long addr) |
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{ struct latch_tree_node *ltn; |
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ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
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if (!ltn) return NULL; return container_of(ltn, struct mod_tree_node, node)->mod; } |
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#else /* MODULES_TREE_LOOKUP */ |
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static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
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static void mod_tree_insert(struct module *mod) { } static void mod_tree_remove_init(struct module *mod) { } static void mod_tree_remove(struct module *mod) { } static struct module *mod_find(unsigned long addr) { struct module *mod; list_for_each_entry_rcu(mod, &modules, list) { if (within_module(addr, mod)) return mod; } return NULL; } #endif /* MODULES_TREE_LOOKUP */ |
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/* * Bounds of module text, for speeding up __module_address. * Protected by module_mutex. */ static void __mod_update_bounds(void *base, unsigned int size) { unsigned long min = (unsigned long)base; unsigned long max = min + size; if (min < module_addr_min) module_addr_min = min; if (max > module_addr_max) module_addr_max = max; } static void mod_update_bounds(struct module *mod) { |
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__mod_update_bounds(mod->core_layout.base, mod->core_layout.size); if (mod->init_layout.size) __mod_update_bounds(mod->init_layout.base, mod->init_layout.size); |
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} |
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#ifdef CONFIG_KGDB_KDB struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ #endif /* CONFIG_KGDB_KDB */ |
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static void module_assert_mutex(void) { lockdep_assert_held(&module_mutex); } static void module_assert_mutex_or_preempt(void) { #ifdef CONFIG_LOCKDEP if (unlikely(!debug_locks)) return; WARN_ON(!rcu_read_lock_sched_held() && !lockdep_is_held(&module_mutex)); #endif } |
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static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); #ifndef CONFIG_MODULE_SIG_FORCE |
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module_param(sig_enforce, bool_enable_only, 0644); #endif /* !CONFIG_MODULE_SIG_FORCE */ |
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/* Block module loading/unloading? */ int modules_disabled = 0; |
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core_param(nomodule, modules_disabled, bint, 0); |
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/* Waiting for a module to finish initializing? */ static DECLARE_WAIT_QUEUE_HEAD(module_wq); |
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static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
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int register_module_notifier(struct notifier_block *nb) |
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{ |
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return blocking_notifier_chain_register(&module_notify_list, nb); |
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} EXPORT_SYMBOL(register_module_notifier); |
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int unregister_module_notifier(struct notifier_block *nb) |
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{ |
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return blocking_notifier_chain_unregister(&module_notify_list, nb); |
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} EXPORT_SYMBOL(unregister_module_notifier); |
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struct load_info { Elf_Ehdr *hdr; unsigned long len; Elf_Shdr *sechdrs; |
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char *secstrings, *strtab; |
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unsigned long symoffs, stroffs; |
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struct _ddebug *debug; unsigned int num_debug; |
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bool sig_ok; |
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struct { unsigned int sym, str, mod, vers, info, pcpu; } index; }; |
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/* We require a truly strong try_module_get(): 0 means failure due to ongoing or failed initialization etc. */ |
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static inline int strong_try_module_get(struct module *mod) { |
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BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
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if (mod && mod->state == MODULE_STATE_COMING) |
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return -EBUSY; if (try_module_get(mod)) |
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return 0; |
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else return -ENOENT; |
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} |
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static inline void add_taint_module(struct module *mod, unsigned flag, enum lockdep_ok lockdep_ok) |
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{ |
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add_taint(flag, lockdep_ok); |
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mod->taints |= (1U << flag); |
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} |
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/* * A thread that wants to hold a reference to a module only while it * is running can call this to safely exit. nfsd and lockd use this. |
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*/ void __module_put_and_exit(struct module *mod, long code) { module_put(mod); do_exit(code); } EXPORT_SYMBOL(__module_put_and_exit); |
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/* Find a module section: 0 means not found. */ |
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static unsigned int find_sec(const struct load_info *info, const char *name) |
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{ unsigned int i; |
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for (i = 1; i < info->hdr->e_shnum; i++) { Elf_Shdr *shdr = &info->sechdrs[i]; |
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/* Alloc bit cleared means "ignore it." */ |
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if ((shdr->sh_flags & SHF_ALLOC) && strcmp(info->secstrings + shdr->sh_name, name) == 0) |
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return i; |
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} |
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return 0; } |
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/* Find a module section, or NULL. */ |
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static void *section_addr(const struct load_info *info, const char *name) |
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{ /* Section 0 has sh_addr 0. */ |
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return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
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} /* Find a module section, or NULL. Fill in number of "objects" in section. */ |
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static void *section_objs(const struct load_info *info, |
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const char *name, size_t object_size, unsigned int *num) { |
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unsigned int sec = find_sec(info, name); |
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/* Section 0 has sh_addr 0 and sh_size 0. */ |
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*num = info->sechdrs[sec].sh_size / object_size; return (void *)info->sechdrs[sec].sh_addr; |
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} |
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/* Provided by the linker */ extern const struct kernel_symbol __start___ksymtab[]; extern const struct kernel_symbol __stop___ksymtab[]; extern const struct kernel_symbol __start___ksymtab_gpl[]; extern const struct kernel_symbol __stop___ksymtab_gpl[]; |
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extern const struct kernel_symbol __start___ksymtab_gpl_future[]; extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; |
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extern const unsigned long __start___kcrctab[]; extern const unsigned long __start___kcrctab_gpl[]; |
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extern const unsigned long __start___kcrctab_gpl_future[]; |
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#ifdef CONFIG_UNUSED_SYMBOLS extern const struct kernel_symbol __start___ksymtab_unused[]; extern const struct kernel_symbol __stop___ksymtab_unused[]; extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; |
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extern const unsigned long __start___kcrctab_unused[]; extern const unsigned long __start___kcrctab_unused_gpl[]; |
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#endif |
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#ifndef CONFIG_MODVERSIONS #define symversion(base, idx) NULL #else |
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#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
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#endif |
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static bool each_symbol_in_section(const struct symsearch *arr, unsigned int arrsize, struct module *owner, bool (*fn)(const struct symsearch *syms, struct module *owner, |
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void *data), |
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void *data) |
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{ |
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unsigned int j; |
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for (j = 0; j < arrsize; j++) { |
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if (fn(&arr[j], owner, data)) return true; |
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} |
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return false; |
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} |
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/* Returns true as soon as fn returns true, otherwise false. */ |
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bool each_symbol_section(bool (*fn)(const struct symsearch *arr, struct module *owner, void *data), void *data) |
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{ struct module *mod; |
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static const struct symsearch arr[] = { |
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{ __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
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NOT_GPL_ONLY, false }, |
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{ __start___ksymtab_gpl, __stop___ksymtab_gpl, |
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__start___kcrctab_gpl, GPL_ONLY, false }, |
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{ __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
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__start___kcrctab_gpl_future, WILL_BE_GPL_ONLY, false }, |
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#ifdef CONFIG_UNUSED_SYMBOLS |
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{ __start___ksymtab_unused, __stop___ksymtab_unused, |
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__start___kcrctab_unused, NOT_GPL_ONLY, true }, |
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{ __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
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__start___kcrctab_unused_gpl, GPL_ONLY, true }, |
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#endif |
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}; |
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module_assert_mutex_or_preempt(); |
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if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) return true; |
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list_for_each_entry_rcu(mod, &modules, list) { |
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struct symsearch arr[] = { { mod->syms, mod->syms + mod->num_syms, mod->crcs, |
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NOT_GPL_ONLY, false }, |
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{ mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
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mod->gpl_crcs, GPL_ONLY, false }, |
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{ mod->gpl_future_syms, mod->gpl_future_syms + mod->num_gpl_future_syms, |
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mod->gpl_future_crcs, WILL_BE_GPL_ONLY, false }, |
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#ifdef CONFIG_UNUSED_SYMBOLS |
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{ mod->unused_syms, mod->unused_syms + mod->num_unused_syms, |
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mod->unused_crcs, NOT_GPL_ONLY, true }, |
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{ mod->unused_gpl_syms, mod->unused_gpl_syms + mod->num_unused_gpl_syms, |
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mod->unused_gpl_crcs, GPL_ONLY, true }, |
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#endif |
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}; |
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if (mod->state == MODULE_STATE_UNFORMED) continue; |
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if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) return true; } return false; } |
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EXPORT_SYMBOL_GPL(each_symbol_section); |
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struct find_symbol_arg { /* Input */ const char *name; bool gplok; bool warn; /* Output */ struct module *owner; const unsigned long *crc; |
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const struct kernel_symbol *sym; |
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}; |
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static bool check_symbol(const struct symsearch *syms, struct module *owner, unsigned int symnum, void *data) |
dafd0940c
|
469 470 |
{ struct find_symbol_arg *fsa = data; |
dafd0940c
|
471 472 473 474 |
if (!fsa->gplok) { if (syms->licence == GPL_ONLY) return false; if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { |
bddb12b32
|
475 476 477 478 |
pr_warn("Symbol %s is being used by a non-GPL module, " "which will not be allowed in the future ", fsa->name); |
9f28bb7e1
|
479 |
} |
1da177e4c
|
480 |
} |
ad9546c99
|
481 |
|
f7f5b6755
|
482 |
#ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940c
|
483 |
if (syms->unused && fsa->warn) { |
bddb12b32
|
484 485 486 487 488 |
pr_warn("Symbol %s is marked as UNUSED, however this module is " "using it. ", fsa->name); pr_warn("This symbol will go away in the future. "); |
7b63c3ab9
|
489 490 491 |
pr_warn("Please evaluate if this is the right api to use and " "if it really is, submit a report to the linux kernel " "mailing list together with submitting your code for " |
bddb12b32
|
492 493 |
"inclusion. "); |
dafd0940c
|
494 |
} |
f7f5b6755
|
495 |
#endif |
dafd0940c
|
496 497 498 |
fsa->owner = owner; fsa->crc = symversion(syms->crcs, symnum); |
414fd31b2
|
499 |
fsa->sym = &syms->start[symnum]; |
dafd0940c
|
500 501 |
return true; } |
403ed2784
|
502 503 504 505 506 507 508 |
static int cmp_name(const void *va, const void *vb) { const char *a; const struct kernel_symbol *b; a = va; b = vb; return strcmp(a, b->name); } |
de4d8d534
|
509 510 511 512 513 |
static bool find_symbol_in_section(const struct symsearch *syms, struct module *owner, void *data) { struct find_symbol_arg *fsa = data; |
403ed2784
|
514 515 516 517 518 519 520 |
struct kernel_symbol *sym; sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, sizeof(struct kernel_symbol), cmp_name); if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) return true; |
de4d8d534
|
521 |
|
de4d8d534
|
522 523 |
return false; } |
414fd31b2
|
524 |
/* Find a symbol and return it, along with, (optional) crc and |
75676500f
|
525 |
* (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b378019
|
526 527 528 529 530 |
const struct kernel_symbol *find_symbol(const char *name, struct module **owner, const unsigned long **crc, bool gplok, bool warn) |
dafd0940c
|
531 532 533 534 535 536 |
{ struct find_symbol_arg fsa; fsa.name = name; fsa.gplok = gplok; fsa.warn = warn; |
de4d8d534
|
537 |
if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940c
|
538 539 540 541 |
if (owner) *owner = fsa.owner; if (crc) *crc = fsa.crc; |
414fd31b2
|
542 |
return fsa.sym; |
dafd0940c
|
543 |
} |
5e1241692
|
544 545 |
pr_debug("Failed to find symbol %s ", name); |
414fd31b2
|
546 |
return NULL; |
1da177e4c
|
547 |
} |
c6b378019
|
548 |
EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4c
|
549 |
|
fe0d34d24
|
550 551 552 553 |
/* * Search for module by name: must hold module_mutex (or preempt disabled * for read-only access). */ |
4f6de4d51
|
554 |
static struct module *find_module_all(const char *name, size_t len, |
0d21b0e34
|
555 |
bool even_unformed) |
1da177e4c
|
556 557 |
{ struct module *mod; |
fe0d34d24
|
558 |
module_assert_mutex_or_preempt(); |
0be964be0
|
559 |
|
1da177e4c
|
560 |
list_for_each_entry(mod, &modules, list) { |
0d21b0e34
|
561 562 |
if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) continue; |
4f6de4d51
|
563 |
if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
1da177e4c
|
564 565 566 567 |
return mod; } return NULL; } |
0d21b0e34
|
568 569 570 |
struct module *find_module(const char *name) { |
fe0d34d24
|
571 |
module_assert_mutex(); |
4f6de4d51
|
572 |
return find_module_all(name, strlen(name), false); |
0d21b0e34
|
573 |
} |
c6b378019
|
574 |
EXPORT_SYMBOL_GPL(find_module); |
1da177e4c
|
575 576 |
#ifdef CONFIG_SMP |
fbf59bc9d
|
577 |
|
259354dea
|
578 |
static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9d
|
579 |
{ |
259354dea
|
580 581 |
return mod->percpu; } |
fbf59bc9d
|
582 |
|
9eb76d779
|
583 |
static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354dea
|
584 |
{ |
9eb76d779
|
585 586 587 588 589 |
Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; unsigned long align = pcpusec->sh_addralign; if (!pcpusec->sh_size) return 0; |
fbf59bc9d
|
590 |
if (align > PAGE_SIZE) { |
bddb12b32
|
591 592 593 |
pr_warn("%s: per-cpu alignment %li > %li ", mod->name, align, PAGE_SIZE); |
fbf59bc9d
|
594 595 |
align = PAGE_SIZE; } |
9eb76d779
|
596 |
mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
259354dea
|
597 |
if (!mod->percpu) { |
bddb12b32
|
598 599 600 |
pr_warn("%s: Could not allocate %lu bytes percpu data ", mod->name, (unsigned long)pcpusec->sh_size); |
259354dea
|
601 602 |
return -ENOMEM; } |
9eb76d779
|
603 |
mod->percpu_size = pcpusec->sh_size; |
259354dea
|
604 |
return 0; |
fbf59bc9d
|
605 |
} |
259354dea
|
606 |
static void percpu_modfree(struct module *mod) |
fbf59bc9d
|
607 |
{ |
259354dea
|
608 |
free_percpu(mod->percpu); |
fbf59bc9d
|
609 |
} |
49668688d
|
610 |
static unsigned int find_pcpusec(struct load_info *info) |
6b588c18f
|
611 |
{ |
49668688d
|
612 |
return find_sec(info, ".data..percpu"); |
6b588c18f
|
613 |
} |
259354dea
|
614 615 |
static void percpu_modcopy(struct module *mod, const void *from, unsigned long size) |
6b588c18f
|
616 617 618 619 |
{ int cpu; for_each_possible_cpu(cpu) |
259354dea
|
620 |
memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18f
|
621 |
} |
10fad5e46
|
622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 |
/** * is_module_percpu_address - test whether address is from module static percpu * @addr: address to test * * Test whether @addr belongs to module static percpu area. * * RETURNS: * %true if @addr is from module static percpu area */ bool is_module_percpu_address(unsigned long addr) { struct module *mod; unsigned int cpu; preempt_disable(); list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e34
|
639 640 |
if (mod->state == MODULE_STATE_UNFORMED) continue; |
10fad5e46
|
641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 |
if (!mod->percpu_size) continue; for_each_possible_cpu(cpu) { void *start = per_cpu_ptr(mod->percpu, cpu); if ((void *)addr >= start && (void *)addr < start + mod->percpu_size) { preempt_enable(); return true; } } } preempt_enable(); return false; |
6b588c18f
|
656 |
} |
1da177e4c
|
657 |
#else /* ... !CONFIG_SMP */ |
6b588c18f
|
658 |
|
259354dea
|
659 |
static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4c
|
660 661 662 |
{ return NULL; } |
9eb76d779
|
663 |
static int percpu_modalloc(struct module *mod, struct load_info *info) |
259354dea
|
664 |
{ |
9eb76d779
|
665 666 667 668 |
/* UP modules shouldn't have this section: ENOMEM isn't quite right */ if (info->sechdrs[info->index.pcpu].sh_size != 0) return -ENOMEM; return 0; |
259354dea
|
669 670 |
} static inline void percpu_modfree(struct module *mod) |
1da177e4c
|
671 |
{ |
1da177e4c
|
672 |
} |
49668688d
|
673 |
static unsigned int find_pcpusec(struct load_info *info) |
1da177e4c
|
674 675 676 |
{ return 0; } |
259354dea
|
677 678 |
static inline void percpu_modcopy(struct module *mod, const void *from, unsigned long size) |
1da177e4c
|
679 680 681 682 |
{ /* pcpusec should be 0, and size of that section should be 0. */ BUG_ON(size != 0); } |
10fad5e46
|
683 684 685 686 |
bool is_module_percpu_address(unsigned long addr) { return false; } |
6b588c18f
|
687 |
|
1da177e4c
|
688 |
#endif /* CONFIG_SMP */ |
c988d2b28
|
689 690 691 692 693 694 |
#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, \ |
4befb026c
|
695 |
struct module_kobject *mk, char *buffer) \ |
c988d2b28
|
696 |
{ \ |
cc56ded3f
|
697 698 |
return scnprintf(buffer, PAGE_SIZE, "%s ", mk->mod->field); \ |
c988d2b28
|
699 700 701 702 703 704 705 |
} \ static int modinfo_##field##_exists(struct module *mod) \ { \ return mod->field != NULL; \ } \ static void free_modinfo_##field(struct module *mod) \ { \ |
22a8bdeb5
|
706 707 |
kfree(mod->field); \ mod->field = NULL; \ |
c988d2b28
|
708 709 |
} \ static struct module_attribute modinfo_##field = { \ |
7b595756e
|
710 |
.attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b28
|
711 712 713 714 715 716 717 718 |
.show = show_modinfo_##field, \ .setup = setup_modinfo_##field, \ .test = modinfo_##field##_exists, \ .free = free_modinfo_##field, \ }; MODINFO_ATTR(version); MODINFO_ATTR(srcversion); |
e14af7eeb
|
719 |
static char last_unloaded_module[MODULE_NAME_LEN+1]; |
03e88ae1b
|
720 |
#ifdef CONFIG_MODULE_UNLOAD |
eb0c53771
|
721 722 |
EXPORT_TRACEPOINT_SYMBOL(module_get); |
e513cc1c0
|
723 724 |
/* MODULE_REF_BASE is the base reference count by kmodule loader. */ #define MODULE_REF_BASE 1 |
1da177e4c
|
725 |
/* Init the unload section of the module. */ |
9f85a4bbb
|
726 |
static int module_unload_init(struct module *mod) |
1da177e4c
|
727 |
{ |
e513cc1c0
|
728 729 730 731 732 |
/* * Initialize reference counter to MODULE_REF_BASE. * refcnt == 0 means module is going. */ atomic_set(&mod->refcnt, MODULE_REF_BASE); |
9f85a4bbb
|
733 |
|
2c02dfe7f
|
734 735 |
INIT_LIST_HEAD(&mod->source_list); INIT_LIST_HEAD(&mod->target_list); |
e1783a240
|
736 |
|
1da177e4c
|
737 |
/* Hold reference count during initialization. */ |
e513cc1c0
|
738 |
atomic_inc(&mod->refcnt); |
9f85a4bbb
|
739 740 |
return 0; |
1da177e4c
|
741 |
} |
1da177e4c
|
742 743 744 745 |
/* Does a already use b? */ static int already_uses(struct module *a, struct module *b) { struct module_use *use; |
2c02dfe7f
|
746 747 |
list_for_each_entry(use, &b->source_list, source_list) { if (use->source == a) { |
5e1241692
|
748 749 |
pr_debug("%s uses %s! ", a->name, b->name); |
1da177e4c
|
750 751 752 |
return 1; } } |
5e1241692
|
753 754 |
pr_debug("%s does not use %s! ", a->name, b->name); |
1da177e4c
|
755 756 |
return 0; } |
2c02dfe7f
|
757 758 759 760 761 762 763 764 765 |
/* * Module a uses b * - we add 'a' as a "source", 'b' as a "target" of module use * - the module_use is added to the list of 'b' sources (so * 'b' can walk the list to see who sourced them), and of 'a' * targets (so 'a' can see what modules it targets). */ static int add_module_usage(struct module *a, struct module *b) { |
2c02dfe7f
|
766 |
struct module_use *use; |
5e1241692
|
767 768 |
pr_debug("Allocating new usage for %s. ", a->name); |
2c02dfe7f
|
769 770 |
use = kmalloc(sizeof(*use), GFP_ATOMIC); if (!use) { |
bddb12b32
|
771 772 |
pr_warn("%s: out of memory loading ", a->name); |
2c02dfe7f
|
773 774 775 776 777 778 779 |
return -ENOMEM; } use->source = a; use->target = b; list_add(&use->source_list, &b->source_list); list_add(&use->target_list, &a->target_list); |
2c02dfe7f
|
780 781 |
return 0; } |
75676500f
|
782 |
/* Module a uses b: caller needs module_mutex() */ |
9bea7f239
|
783 |
int ref_module(struct module *a, struct module *b) |
1da177e4c
|
784 |
{ |
c8e21ced0
|
785 |
int err; |
270a6c4ca
|
786 |
|
9bea7f239
|
787 |
if (b == NULL || already_uses(a, b)) |
218ce7351
|
788 |
return 0; |
218ce7351
|
789 |
|
9bea7f239
|
790 791 |
/* If module isn't available, we fail. */ err = strong_try_module_get(b); |
c9a3ba55b
|
792 |
if (err) |
9bea7f239
|
793 |
return err; |
1da177e4c
|
794 |
|
2c02dfe7f
|
795 796 |
err = add_module_usage(a, b); if (err) { |
1da177e4c
|
797 |
module_put(b); |
9bea7f239
|
798 |
return err; |
1da177e4c
|
799 |
} |
9bea7f239
|
800 |
return 0; |
1da177e4c
|
801 |
} |
9bea7f239
|
802 |
EXPORT_SYMBOL_GPL(ref_module); |
1da177e4c
|
803 804 805 806 |
/* Clear the unload stuff of the module. */ static void module_unload_free(struct module *mod) { |
2c02dfe7f
|
807 |
struct module_use *use, *tmp; |
1da177e4c
|
808 |
|
75676500f
|
809 |
mutex_lock(&module_mutex); |
2c02dfe7f
|
810 811 |
list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { struct module *i = use->target; |
5e1241692
|
812 813 |
pr_debug("%s unusing %s ", mod->name, i->name); |
2c02dfe7f
|
814 815 816 817 |
module_put(i); list_del(&use->source_list); list_del(&use->target_list); kfree(use); |
1da177e4c
|
818 |
} |
75676500f
|
819 |
mutex_unlock(&module_mutex); |
1da177e4c
|
820 821 822 |
} #ifdef CONFIG_MODULE_FORCE_UNLOAD |
fb1697933
|
823 |
static inline int try_force_unload(unsigned int flags) |
1da177e4c
|
824 825 826 |
{ int ret = (flags & O_TRUNC); if (ret) |
373d4d099
|
827 |
add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
1da177e4c
|
828 829 830 |
return ret; } #else |
fb1697933
|
831 |
static inline int try_force_unload(unsigned int flags) |
1da177e4c
|
832 833 834 835 |
{ return 0; } #endif /* CONFIG_MODULE_FORCE_UNLOAD */ |
e513cc1c0
|
836 837 |
/* Try to release refcount of module, 0 means success. */ static int try_release_module_ref(struct module *mod) |
1da177e4c
|
838 |
{ |
e513cc1c0
|
839 |
int ret; |
1da177e4c
|
840 |
|
e513cc1c0
|
841 842 843 844 845 846 |
/* Try to decrement refcnt which we set at loading */ ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); BUG_ON(ret < 0); if (ret) /* Someone can put this right now, recover with checking */ ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); |
1da177e4c
|
847 |
|
e513cc1c0
|
848 849 |
return ret; } |
1da177e4c
|
850 |
|
e513cc1c0
|
851 852 |
static int try_stop_module(struct module *mod, int flags, int *forced) { |
da39ba5e1
|
853 |
/* If it's not unused, quit unless we're forcing. */ |
e513cc1c0
|
854 855 856 |
if (try_release_module_ref(mod) != 0) { *forced = try_force_unload(flags); if (!(*forced)) |
1da177e4c
|
857 858 859 860 |
return -EWOULDBLOCK; } /* Mark it as dying. */ |
e513cc1c0
|
861 |
mod->state = MODULE_STATE_GOING; |
1da177e4c
|
862 |
|
e513cc1c0
|
863 |
return 0; |
1da177e4c
|
864 |
} |
d5db139ab
|
865 866 867 868 869 870 871 872 873 874 |
/** * module_refcount - return the refcount or -1 if unloading * * @mod: the module we're checking * * Returns: * -1 if the module is in the process of unloading * otherwise the number of references in the kernel to the module */ int module_refcount(struct module *mod) |
1da177e4c
|
875 |
{ |
d5db139ab
|
876 |
return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
1da177e4c
|
877 878 879 880 881 |
} EXPORT_SYMBOL(module_refcount); /* This exists whether we can unload or not */ static void free_module(struct module *mod); |
17da2bd90
|
882 883 |
SYSCALL_DEFINE2(delete_module, const char __user *, name_user, unsigned int, flags) |
1da177e4c
|
884 885 |
{ struct module *mod; |
dfff0a067
|
886 |
char name[MODULE_NAME_LEN]; |
1da177e4c
|
887 |
int ret, forced = 0; |
3d43321b7
|
888 |
if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a067
|
889 890 891 892 893 |
return -EPERM; if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) return -EFAULT; name[MODULE_NAME_LEN-1] = '\0'; |
3fc1f1e27
|
894 895 |
if (mutex_lock_interruptible(&module_mutex) != 0) return -EINTR; |
1da177e4c
|
896 897 898 899 900 901 |
mod = find_module(name); if (!mod) { ret = -ENOENT; goto out; } |
2c02dfe7f
|
902 |
if (!list_empty(&mod->source_list)) { |
1da177e4c
|
903 904 905 906 907 908 909 |
/* 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) { |
3f2b9c9cd
|
910 |
/* FIXME: if (force), slam module count damn the torpedoes */ |
5e1241692
|
911 912 |
pr_debug("%s already dying ", mod->name); |
1da177e4c
|
913 914 915 916 917 |
ret = -EBUSY; goto out; } /* If it has an init func, it must have an exit func to unload */ |
af49d9248
|
918 |
if (mod->init && !mod->exit) { |
fb1697933
|
919 |
forced = try_force_unload(flags); |
1da177e4c
|
920 921 922 923 924 925 |
if (!forced) { /* This module can't be removed */ ret = -EBUSY; goto out; } } |
1da177e4c
|
926 927 928 929 |
/* Stop the machine so refcounts can't move and disable module. */ ret = try_stop_module(mod, flags, &forced); if (ret != 0) goto out; |
df4b565e1
|
930 |
mutex_unlock(&module_mutex); |
25985edce
|
931 |
/* Final destruction now no one is using it. */ |
df4b565e1
|
932 |
if (mod->exit != NULL) |
1da177e4c
|
933 |
mod->exit(); |
df4b565e1
|
934 935 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_GOING, mod); |
22a9d6456
|
936 |
async_synchronize_full(); |
75676500f
|
937 |
|
e14af7eeb
|
938 |
/* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e3
|
939 |
strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4c
|
940 |
|
75676500f
|
941 942 943 |
free_module(mod); return 0; out: |
6389a3851
|
944 |
mutex_unlock(&module_mutex); |
1da177e4c
|
945 946 |
return ret; } |
d1e99d7ae
|
947 |
static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4c
|
948 949 950 |
{ struct module_use *use; int printed_something = 0; |
d5db139ab
|
951 |
seq_printf(m, " %i ", module_refcount(mod)); |
1da177e4c
|
952 |
|
6da0b5651
|
953 954 955 956 |
/* * Always include a trailing , so userspace can differentiate * between this and the old multi-field proc format. */ |
2c02dfe7f
|
957 |
list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4c
|
958 |
printed_something = 1; |
2c02dfe7f
|
959 |
seq_printf(m, "%s,", use->source->name); |
1da177e4c
|
960 |
} |
1da177e4c
|
961 962 |
if (mod->init != NULL && mod->exit == NULL) { printed_something = 1; |
6da0b5651
|
963 |
seq_puts(m, "[permanent],"); |
1da177e4c
|
964 965 966 |
} if (!printed_something) |
6da0b5651
|
967 |
seq_puts(m, "-"); |
1da177e4c
|
968 969 970 971 972 |
} void __symbol_put(const char *symbol) { struct module *owner; |
1da177e4c
|
973 |
|
24da1cbff
|
974 |
preempt_disable(); |
414fd31b2
|
975 |
if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4c
|
976 977 |
BUG(); module_put(owner); |
24da1cbff
|
978 |
preempt_enable(); |
1da177e4c
|
979 980 |
} EXPORT_SYMBOL(__symbol_put); |
7d1d16e41
|
981 |
/* Note this assumes addr is a function, which it currently always is. */ |
1da177e4c
|
982 983 |
void symbol_put_addr(void *addr) { |
5e3766138
|
984 |
struct module *modaddr; |
7d1d16e41
|
985 |
unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4c
|
986 |
|
7d1d16e41
|
987 |
if (core_kernel_text(a)) |
5e3766138
|
988 |
return; |
1da177e4c
|
989 |
|
275d7d44d
|
990 991 992 993 994 |
/* * Even though we hold a reference on the module; we still need to * disable preemption in order to safely traverse the data structure. */ preempt_disable(); |
7d1d16e41
|
995 |
modaddr = __module_text_address(a); |
a6e6abd57
|
996 |
BUG_ON(!modaddr); |
5e3766138
|
997 |
module_put(modaddr); |
275d7d44d
|
998 |
preempt_enable(); |
1da177e4c
|
999 1000 1001 1002 |
} EXPORT_SYMBOL_GPL(symbol_put_addr); static ssize_t show_refcnt(struct module_attribute *mattr, |
4befb026c
|
1003 |
struct module_kobject *mk, char *buffer) |
1da177e4c
|
1004 |
{ |
d5db139ab
|
1005 1006 |
return sprintf(buffer, "%i ", module_refcount(mk->mod)); |
1da177e4c
|
1007 |
} |
cca3e7073
|
1008 1009 |
static struct module_attribute modinfo_refcnt = __ATTR(refcnt, 0444, show_refcnt, NULL); |
1da177e4c
|
1010 |
|
d53799be6
|
1011 1012 1013 1014 |
void __module_get(struct module *module) { if (module) { preempt_disable(); |
2f35c41f5
|
1015 |
atomic_inc(&module->refcnt); |
d53799be6
|
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 |
trace_module_get(module, _RET_IP_); preempt_enable(); } } EXPORT_SYMBOL(__module_get); bool try_module_get(struct module *module) { bool ret = true; if (module) { preempt_disable(); |
e513cc1c0
|
1028 1029 1030 |
/* Note: here, we can fail to get a reference */ if (likely(module_is_live(module) && atomic_inc_not_zero(&module->refcnt) != 0)) |
d53799be6
|
1031 |
trace_module_get(module, _RET_IP_); |
e513cc1c0
|
1032 |
else |
d53799be6
|
1033 1034 1035 1036 1037 1038 1039 |
ret = false; preempt_enable(); } return ret; } EXPORT_SYMBOL(try_module_get); |
f6a570333
|
1040 1041 |
void module_put(struct module *module) { |
e513cc1c0
|
1042 |
int ret; |
f6a570333
|
1043 |
if (module) { |
e1783a240
|
1044 |
preempt_disable(); |
e513cc1c0
|
1045 1046 |
ret = atomic_dec_if_positive(&module->refcnt); WARN_ON(ret < 0); /* Failed to put refcount */ |
ae832d1e0
|
1047 |
trace_module_put(module, _RET_IP_); |
e1783a240
|
1048 |
preempt_enable(); |
f6a570333
|
1049 1050 1051 |
} } EXPORT_SYMBOL(module_put); |
1da177e4c
|
1052 |
#else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7ae
|
1053 |
static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4c
|
1054 1055 |
{ /* We don't know the usage count, or what modules are using. */ |
6da0b5651
|
1056 |
seq_puts(m, " - -"); |
1da177e4c
|
1057 1058 1059 1060 1061 |
} static inline void module_unload_free(struct module *mod) { } |
9bea7f239
|
1062 |
int ref_module(struct module *a, struct module *b) |
1da177e4c
|
1063 |
{ |
9bea7f239
|
1064 |
return strong_try_module_get(b); |
1da177e4c
|
1065 |
} |
9bea7f239
|
1066 |
EXPORT_SYMBOL_GPL(ref_module); |
1da177e4c
|
1067 |
|
9f85a4bbb
|
1068 |
static inline int module_unload_init(struct module *mod) |
1da177e4c
|
1069 |
{ |
9f85a4bbb
|
1070 |
return 0; |
1da177e4c
|
1071 1072 |
} #endif /* CONFIG_MODULE_UNLOAD */ |
53999bf34
|
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 |
static size_t module_flags_taint(struct module *mod, char *buf) { size_t l = 0; if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) buf[l++] = 'P'; if (mod->taints & (1 << TAINT_OOT_MODULE)) buf[l++] = 'O'; if (mod->taints & (1 << TAINT_FORCED_MODULE)) buf[l++] = 'F'; if (mod->taints & (1 << TAINT_CRAP)) buf[l++] = 'C'; |
66cc69e34
|
1085 |
if (mod->taints & (1 << TAINT_UNSIGNED_MODULE)) |
57673c2b0
|
1086 |
buf[l++] = 'E'; |
53999bf34
|
1087 1088 |
/* * TAINT_FORCED_RMMOD: could be added. |
8c90487cd
|
1089 |
* TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't |
53999bf34
|
1090 1091 1092 1093 |
* apply to modules. */ return l; } |
1f71740ab
|
1094 |
static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026c
|
1095 |
struct module_kobject *mk, char *buffer) |
1f71740ab
|
1096 1097 |
{ const char *state = "unknown"; |
4befb026c
|
1098 |
switch (mk->mod->state) { |
1f71740ab
|
1099 1100 1101 1102 1103 1104 1105 1106 1107 |
case MODULE_STATE_LIVE: state = "live"; break; case MODULE_STATE_COMING: state = "coming"; break; case MODULE_STATE_GOING: state = "going"; break; |
0d21b0e34
|
1108 1109 |
default: BUG(); |
1f71740ab
|
1110 1111 1112 1113 |
} return sprintf(buffer, "%s ", state); } |
cca3e7073
|
1114 1115 |
static struct module_attribute modinfo_initstate = __ATTR(initstate, 0444, show_initstate, NULL); |
1f71740ab
|
1116 |
|
88bfa3247
|
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 |
static ssize_t store_uevent(struct module_attribute *mattr, struct module_kobject *mk, const char *buffer, size_t count) { enum kobject_action action; if (kobject_action_type(buffer, count, &action) == 0) kobject_uevent(&mk->kobj, action); return count; } |
cca3e7073
|
1127 1128 1129 1130 1131 1132 |
struct module_attribute module_uevent = __ATTR(uevent, 0200, NULL, store_uevent); static ssize_t show_coresize(struct module_attribute *mattr, struct module_kobject *mk, char *buffer) { |
7523e4dc5
|
1133 1134 |
return sprintf(buffer, "%u ", mk->mod->core_layout.size); |
cca3e7073
|
1135 1136 1137 1138 1139 1140 1141 1142 |
} static struct module_attribute modinfo_coresize = __ATTR(coresize, 0444, show_coresize, NULL); static ssize_t show_initsize(struct module_attribute *mattr, struct module_kobject *mk, char *buffer) { |
7523e4dc5
|
1143 1144 |
return sprintf(buffer, "%u ", mk->mod->init_layout.size); |
cca3e7073
|
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 |
} static struct module_attribute modinfo_initsize = __ATTR(initsize, 0444, show_initsize, NULL); static ssize_t show_taint(struct module_attribute *mattr, struct module_kobject *mk, char *buffer) { size_t l; l = module_flags_taint(mk->mod, buffer); buffer[l++] = ' '; return l; } static struct module_attribute modinfo_taint = __ATTR(taint, 0444, show_taint, NULL); |
88bfa3247
|
1163 |
|
03e88ae1b
|
1164 |
static struct module_attribute *modinfo_attrs[] = { |
cca3e7073
|
1165 |
&module_uevent, |
03e88ae1b
|
1166 1167 |
&modinfo_version, &modinfo_srcversion, |
cca3e7073
|
1168 1169 1170 1171 |
&modinfo_initstate, &modinfo_coresize, &modinfo_initsize, &modinfo_taint, |
03e88ae1b
|
1172 |
#ifdef CONFIG_MODULE_UNLOAD |
cca3e7073
|
1173 |
&modinfo_refcnt, |
03e88ae1b
|
1174 1175 1176 |
#endif NULL, }; |
1da177e4c
|
1177 |
static const char vermagic[] = VERMAGIC_STRING; |
c6e665c8f
|
1178 |
static int try_to_force_load(struct module *mod, const char *reason) |
826e4506a
|
1179 1180 |
{ #ifdef CONFIG_MODULE_FORCE_LOAD |
25ddbb18a
|
1181 |
if (!test_taint(TAINT_FORCED_MODULE)) |
bddb12b32
|
1182 1183 |
pr_warn("%s: %s: kernel tainted. ", mod->name, reason); |
373d4d099
|
1184 |
add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
826e4506a
|
1185 1186 1187 1188 1189 |
return 0; #else return -ENOEXEC; #endif } |
1da177e4c
|
1190 |
#ifdef CONFIG_MODVERSIONS |
d4703aefd
|
1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 |
/* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ static unsigned long maybe_relocated(unsigned long crc, const struct module *crc_owner) { #ifdef ARCH_RELOCATES_KCRCTAB if (crc_owner == NULL) return crc - (unsigned long)reloc_start; #endif return crc; } |
1da177e4c
|
1201 1202 1203 |
static int check_version(Elf_Shdr *sechdrs, unsigned int versindex, const char *symname, |
6da0b5651
|
1204 |
struct module *mod, |
d4703aefd
|
1205 1206 |
const unsigned long *crc, const struct module *crc_owner) |
1da177e4c
|
1207 1208 1209 1210 1211 1212 1213 |
{ unsigned int i, num_versions; struct modversion_info *versions; /* Exporting module didn't supply crcs? OK, we're already tainted. */ if (!crc) return 1; |
a5dd69707
|
1214 1215 1216 |
/* No versions at all? modprobe --force does this. */ if (versindex == 0) return try_to_force_load(mod, symname) == 0; |
1da177e4c
|
1217 1218 1219 1220 1221 1222 1223 |
versions = (void *) sechdrs[versindex].sh_addr; num_versions = sechdrs[versindex].sh_size / sizeof(struct modversion_info); for (i = 0; i < num_versions; i++) { if (strcmp(versions[i].name, symname) != 0) continue; |
d4703aefd
|
1224 |
if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4c
|
1225 |
return 1; |
5e1241692
|
1226 1227 |
pr_debug("Found checksum %lX vs module %lX ", |
d4703aefd
|
1228 |
maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506a
|
1229 |
goto bad_version; |
1da177e4c
|
1230 |
} |
826e4506a
|
1231 |
|
bddb12b32
|
1232 1233 |
pr_warn("%s: no symbol version for %s ", mod->name, symname); |
a5dd69707
|
1234 |
return 0; |
826e4506a
|
1235 1236 |
bad_version: |
6da0b5651
|
1237 1238 |
pr_warn("%s: disagrees about version of symbol %s ", |
826e4506a
|
1239 1240 |
mod->name, symname); return 0; |
1da177e4c
|
1241 1242 1243 1244 1245 1246 1247 |
} static inline int check_modstruct_version(Elf_Shdr *sechdrs, unsigned int versindex, struct module *mod) { const unsigned long *crc; |
1da177e4c
|
1248 |
|
926a59b1d
|
1249 1250 1251 1252 1253 |
/* * Since this should be found in kernel (which can't be removed), no * locking is necessary -- use preempt_disable() to placate lockdep. */ preempt_disable(); |
b92021b09
|
1254 |
if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL, |
926a59b1d
|
1255 1256 |
&crc, true, false)) { preempt_enable(); |
1da177e4c
|
1257 |
BUG(); |
926a59b1d
|
1258 1259 |
} preempt_enable(); |
a4b6a77b7
|
1260 1261 |
return check_version(sechdrs, versindex, VMLINUX_SYMBOL_STR(module_layout), mod, crc, |
d4703aefd
|
1262 |
NULL); |
1da177e4c
|
1263 |
} |
91e37a793
|
1264 1265 1266 |
/* First part is kernel version, which we ignore if module has crcs. */ static inline int same_magic(const char *amagic, const char *bmagic, bool has_crcs) |
1da177e4c
|
1267 |
{ |
91e37a793
|
1268 1269 1270 1271 |
if (has_crcs) { amagic += strcspn(amagic, " "); bmagic += strcspn(bmagic, " "); } |
1da177e4c
|
1272 1273 1274 1275 1276 1277 |
return strcmp(amagic, bmagic) == 0; } #else static inline int check_version(Elf_Shdr *sechdrs, unsigned int versindex, const char *symname, |
6da0b5651
|
1278 |
struct module *mod, |
d4703aefd
|
1279 1280 |
const unsigned long *crc, const struct module *crc_owner) |
1da177e4c
|
1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 |
{ return 1; } static inline int check_modstruct_version(Elf_Shdr *sechdrs, unsigned int versindex, struct module *mod) { return 1; } |
91e37a793
|
1291 1292 |
static inline int same_magic(const char *amagic, const char *bmagic, bool has_crcs) |
1da177e4c
|
1293 1294 1295 1296 |
{ return strcmp(amagic, bmagic) == 0; } #endif /* CONFIG_MODVERSIONS */ |
75676500f
|
1297 |
/* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688d
|
1298 1299 |
static const struct kernel_symbol *resolve_symbol(struct module *mod, const struct load_info *info, |
414fd31b2
|
1300 |
const char *name, |
9bea7f239
|
1301 |
char ownername[]) |
1da177e4c
|
1302 1303 |
{ struct module *owner; |
414fd31b2
|
1304 |
const struct kernel_symbol *sym; |
1da177e4c
|
1305 |
const unsigned long *crc; |
9bea7f239
|
1306 |
int err; |
1da177e4c
|
1307 |
|
d64810f56
|
1308 1309 1310 1311 1312 1313 |
/* * The module_mutex should not be a heavily contended lock; * if we get the occasional sleep here, we'll go an extra iteration * in the wait_event_interruptible(), which is harmless. */ sched_annotate_sleep(); |
75676500f
|
1314 |
mutex_lock(&module_mutex); |
414fd31b2
|
1315 |
sym = find_symbol(name, &owner, &crc, |
25ddbb18a
|
1316 |
!(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f239
|
1317 1318 |
if (!sym) goto unlock; |
49668688d
|
1319 1320 |
if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, owner)) { |
9bea7f239
|
1321 1322 |
sym = ERR_PTR(-EINVAL); goto getname; |
1da177e4c
|
1323 |
} |
9bea7f239
|
1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 |
err = ref_module(mod, owner); if (err) { sym = ERR_PTR(err); goto getname; } getname: /* We must make copy under the lock if we failed to get ref. */ strncpy(ownername, module_name(owner), MODULE_NAME_LEN); unlock: |
75676500f
|
1335 |
mutex_unlock(&module_mutex); |
218ce7351
|
1336 |
return sym; |
1da177e4c
|
1337 |
} |
49668688d
|
1338 1339 1340 1341 |
static const struct kernel_symbol * resolve_symbol_wait(struct module *mod, const struct load_info *info, const char *name) |
9bea7f239
|
1342 1343 |
{ const struct kernel_symbol *ksym; |
49668688d
|
1344 |
char owner[MODULE_NAME_LEN]; |
9bea7f239
|
1345 1346 |
if (wait_event_interruptible_timeout(module_wq, |
49668688d
|
1347 1348 |
!IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) || PTR_ERR(ksym) != -EBUSY, |
9bea7f239
|
1349 |
30 * HZ) <= 0) { |
bddb12b32
|
1350 1351 1352 |
pr_warn("%s: gave up waiting for init of module %s. ", mod->name, owner); |
9bea7f239
|
1353 1354 1355 |
} return ksym; } |
1da177e4c
|
1356 1357 1358 1359 |
/* * /sys/module/foo/sections stuff * J. Corbet <corbet@lwn.net> */ |
8f6d03781
|
1360 |
#ifdef CONFIG_SYSFS |
10b465aaf
|
1361 |
|
8f6d03781
|
1362 |
#ifdef CONFIG_KALLSYMS |
10b465aaf
|
1363 1364 1365 1366 |
static inline bool sect_empty(const Elf_Shdr *sect) { return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; } |
6da0b5651
|
1367 |
struct module_sect_attr { |
a58730c42
|
1368 1369 1370 1371 |
struct module_attribute mattr; char *name; unsigned long address; }; |
6da0b5651
|
1372 |
struct module_sect_attrs { |
a58730c42
|
1373 1374 1375 1376 |
struct attribute_group grp; unsigned int nsections; struct module_sect_attr attrs[0]; }; |
1da177e4c
|
1377 |
static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026c
|
1378 |
struct module_kobject *mk, char *buf) |
1da177e4c
|
1379 1380 1381 |
{ struct module_sect_attr *sattr = container_of(mattr, struct module_sect_attr, mattr); |
9f36e2c44
|
1382 1383 |
return sprintf(buf, "0x%pK ", (void *)sattr->address); |
1da177e4c
|
1384 |
} |
04b1db9fd
|
1385 1386 |
static void free_sect_attrs(struct module_sect_attrs *sect_attrs) { |
a58730c42
|
1387 |
unsigned int section; |
04b1db9fd
|
1388 1389 1390 1391 1392 |
for (section = 0; section < sect_attrs->nsections; section++) kfree(sect_attrs->attrs[section].name); kfree(sect_attrs); } |
8f6d03781
|
1393 |
static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4c
|
1394 1395 1396 1397 1398 |
{ unsigned int nloaded = 0, i, size[2]; struct module_sect_attrs *sect_attrs; struct module_sect_attr *sattr; struct attribute **gattr; |
22a8bdeb5
|
1399 |
|
1da177e4c
|
1400 |
/* Count loaded sections and allocate structures */ |
8f6d03781
|
1401 1402 |
for (i = 0; i < info->hdr->e_shnum; i++) if (!sect_empty(&info->sechdrs[i])) |
1da177e4c
|
1403 1404 1405 1406 1407 |
nloaded++; size[0] = ALIGN(sizeof(*sect_attrs) + nloaded * sizeof(sect_attrs->attrs[0]), sizeof(sect_attrs->grp.attrs[0])); size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); |
04b1db9fd
|
1408 1409 |
sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); if (sect_attrs == NULL) |
1da177e4c
|
1410 1411 1412 1413 1414 |
return; /* Setup section attributes. */ sect_attrs->grp.name = "sections"; sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; |
04b1db9fd
|
1415 |
sect_attrs->nsections = 0; |
1da177e4c
|
1416 1417 |
sattr = §_attrs->attrs[0]; gattr = §_attrs->grp.attrs[0]; |
8f6d03781
|
1418 1419 1420 |
for (i = 0; i < info->hdr->e_shnum; i++) { Elf_Shdr *sec = &info->sechdrs[i]; if (sect_empty(sec)) |
35dead423
|
1421 |
continue; |
8f6d03781
|
1422 1423 |
sattr->address = sec->sh_addr; sattr->name = kstrdup(info->secstrings + sec->sh_name, |
04b1db9fd
|
1424 1425 1426 1427 |
GFP_KERNEL); if (sattr->name == NULL) goto out; sect_attrs->nsections++; |
361795b1e
|
1428 |
sysfs_attr_init(&sattr->mattr.attr); |
1da177e4c
|
1429 1430 1431 |
sattr->mattr.show = module_sect_show; sattr->mattr.store = NULL; sattr->mattr.attr.name = sattr->name; |
1da177e4c
|
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 |
sattr->mattr.attr.mode = S_IRUGO; *(gattr++) = &(sattr++)->mattr.attr; } *gattr = NULL; if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) goto out; mod->sect_attrs = sect_attrs; return; out: |
04b1db9fd
|
1443 |
free_sect_attrs(sect_attrs); |
1da177e4c
|
1444 1445 1446 1447 1448 1449 1450 1451 1452 |
} static void remove_sect_attrs(struct module *mod) { if (mod->sect_attrs) { sysfs_remove_group(&mod->mkobj.kobj, &mod->sect_attrs->grp); /* We are positive that no one is using any sect attrs * at this point. Deallocate immediately. */ |
04b1db9fd
|
1453 |
free_sect_attrs(mod->sect_attrs); |
1da177e4c
|
1454 1455 1456 |
mod->sect_attrs = NULL; } } |
6d7601338
|
1457 1458 1459 1460 1461 1462 1463 1464 1465 |
/* * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. */ struct module_notes_attrs { struct kobject *dir; unsigned int notes; struct bin_attribute attrs[0]; }; |
2c3c8bea6
|
1466 |
static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d7601338
|
1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 |
struct bin_attribute *bin_attr, char *buf, loff_t pos, size_t count) { /* * The caller checked the pos and count against our size. */ memcpy(buf, bin_attr->private + pos, count); return count; } static void free_notes_attrs(struct module_notes_attrs *notes_attrs, unsigned int i) { if (notes_attrs->dir) { while (i-- > 0) sysfs_remove_bin_file(notes_attrs->dir, ¬es_attrs->attrs[i]); |
e94320939
|
1484 |
kobject_put(notes_attrs->dir); |
6d7601338
|
1485 1486 1487 |
} kfree(notes_attrs); } |
8f6d03781
|
1488 |
static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d7601338
|
1489 1490 1491 1492 |
{ unsigned int notes, loaded, i; struct module_notes_attrs *notes_attrs; struct bin_attribute *nattr; |
ea6bff368
|
1493 1494 1495 |
/* failed to create section attributes, so can't create notes */ if (!mod->sect_attrs) return; |
6d7601338
|
1496 1497 |
/* Count notes sections and allocate structures. */ notes = 0; |
8f6d03781
|
1498 1499 1500 |
for (i = 0; i < info->hdr->e_shnum; i++) if (!sect_empty(&info->sechdrs[i]) && (info->sechdrs[i].sh_type == SHT_NOTE)) |
6d7601338
|
1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 |
++notes; if (notes == 0) return; notes_attrs = kzalloc(sizeof(*notes_attrs) + notes * sizeof(notes_attrs->attrs[0]), GFP_KERNEL); if (notes_attrs == NULL) return; notes_attrs->notes = notes; nattr = ¬es_attrs->attrs[0]; |
8f6d03781
|
1514 1515 |
for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { if (sect_empty(&info->sechdrs[i])) |
6d7601338
|
1516 |
continue; |
8f6d03781
|
1517 |
if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1e
|
1518 |
sysfs_bin_attr_init(nattr); |
6d7601338
|
1519 1520 |
nattr->attr.name = mod->sect_attrs->attrs[loaded].name; nattr->attr.mode = S_IRUGO; |
8f6d03781
|
1521 1522 |
nattr->size = info->sechdrs[i].sh_size; nattr->private = (void *) info->sechdrs[i].sh_addr; |
6d7601338
|
1523 1524 1525 1526 1527 |
nattr->read = module_notes_read; ++nattr; } ++loaded; } |
4ff6abff8
|
1528 |
notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d7601338
|
1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 |
if (!notes_attrs->dir) goto out; for (i = 0; i < notes; ++i) if (sysfs_create_bin_file(notes_attrs->dir, ¬es_attrs->attrs[i])) goto out; mod->notes_attrs = notes_attrs; return; out: free_notes_attrs(notes_attrs, i); } static void remove_notes_attrs(struct module *mod) { if (mod->notes_attrs) free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); } |
1da177e4c
|
1549 |
#else |
04b1db9fd
|
1550 |
|
8f6d03781
|
1551 1552 |
static inline void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4c
|
1553 1554 1555 1556 1557 1558 |
{ } static inline void remove_sect_attrs(struct module *mod) { } |
6d7601338
|
1559 |
|
8f6d03781
|
1560 1561 |
static inline void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d7601338
|
1562 1563 1564 1565 1566 1567 |
{ } static inline void remove_notes_attrs(struct module *mod) { } |
8f6d03781
|
1568 |
#endif /* CONFIG_KALLSYMS */ |
1da177e4c
|
1569 |
|
80a3d1bb4
|
1570 1571 1572 1573 1574 |
static void add_usage_links(struct module *mod) { #ifdef CONFIG_MODULE_UNLOAD struct module_use *use; int nowarn; |
75676500f
|
1575 |
mutex_lock(&module_mutex); |
80a3d1bb4
|
1576 1577 1578 1579 |
list_for_each_entry(use, &mod->target_list, target_list) { nowarn = sysfs_create_link(use->target->holders_dir, &mod->mkobj.kobj, mod->name); } |
75676500f
|
1580 |
mutex_unlock(&module_mutex); |
80a3d1bb4
|
1581 1582 1583 1584 1585 1586 1587 |
#endif } static void del_usage_links(struct module *mod) { #ifdef CONFIG_MODULE_UNLOAD struct module_use *use; |
75676500f
|
1588 |
mutex_lock(&module_mutex); |
80a3d1bb4
|
1589 1590 |
list_for_each_entry(use, &mod->target_list, target_list) sysfs_remove_link(use->target->holders_dir, mod->name); |
75676500f
|
1591 |
mutex_unlock(&module_mutex); |
80a3d1bb4
|
1592 1593 |
#endif } |
6407ebb27
|
1594 |
static int module_add_modinfo_attrs(struct module *mod) |
c988d2b28
|
1595 1596 |
{ struct module_attribute *attr; |
03e88ae1b
|
1597 |
struct module_attribute *temp_attr; |
c988d2b28
|
1598 1599 |
int error = 0; int i; |
03e88ae1b
|
1600 1601 1602 1603 1604 1605 1606 |
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
|
1607 1608 |
for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { if (!attr->test || |
03e88ae1b
|
1609 1610 |
(attr->test && attr->test(mod))) { memcpy(temp_attr, attr, sizeof(*temp_attr)); |
361795b1e
|
1611 |
sysfs_attr_init(&temp_attr->attr); |
6da0b5651
|
1612 1613 |
error = sysfs_create_file(&mod->mkobj.kobj, &temp_attr->attr); |
03e88ae1b
|
1614 1615 |
++temp_attr; } |
c988d2b28
|
1616 1617 1618 |
} return error; } |
6407ebb27
|
1619 |
static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b28
|
1620 1621 1622 |
{ struct module_attribute *attr; int i; |
03e88ae1b
|
1623 1624 1625 1626 |
for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { /* pick a field to test for end of list */ if (!attr->attr.name) break; |
6da0b5651
|
1627 |
sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
03e88ae1b
|
1628 1629 |
if (attr->free) attr->free(mod); |
c988d2b28
|
1630 |
} |
03e88ae1b
|
1631 |
kfree(mod->modinfo_attrs); |
c988d2b28
|
1632 |
} |
1da177e4c
|
1633 |
|
942e44312
|
1634 1635 1636 1637 1638 1639 1640 |
static void mod_kobject_put(struct module *mod) { DECLARE_COMPLETION_ONSTACK(c); mod->mkobj.kobj_completion = &c; kobject_put(&mod->mkobj.kobj); wait_for_completion(&c); } |
6407ebb27
|
1641 |
static int mod_sysfs_init(struct module *mod) |
1da177e4c
|
1642 1643 |
{ int err; |
6494a93d5
|
1644 |
struct kobject *kobj; |
1da177e4c
|
1645 |
|
823bccfc4
|
1646 |
if (!module_sysfs_initialized) { |
bddb12b32
|
1647 1648 |
pr_err("%s: module sysfs not initialized ", mod->name); |
1cc5f7142
|
1649 1650 1651 |
err = -EINVAL; goto out; } |
6494a93d5
|
1652 1653 1654 |
kobj = kset_find_obj(module_kset, mod->name); if (kobj) { |
bddb12b32
|
1655 1656 |
pr_err("%s: module is already loaded ", mod->name); |
6494a93d5
|
1657 1658 1659 1660 |
kobject_put(kobj); err = -EINVAL; goto out; } |
1da177e4c
|
1661 |
mod->mkobj.mod = mod; |
e17e0f51a
|
1662 |
|
ac3c8141f
|
1663 1664 1665 1666 1667 |
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) |
942e44312
|
1668 |
mod_kobject_put(mod); |
270a6c4ca
|
1669 |
|
97c146ef0
|
1670 |
/* delay uevent until full sysfs population */ |
270a6c4ca
|
1671 1672 1673 |
out: return err; } |
6407ebb27
|
1674 |
static int mod_sysfs_setup(struct module *mod, |
8f6d03781
|
1675 |
const struct load_info *info, |
270a6c4ca
|
1676 1677 1678 1679 |
struct kernel_param *kparam, unsigned int num_params) { int err; |
80a3d1bb4
|
1680 1681 1682 |
err = mod_sysfs_init(mod); if (err) goto out; |
4ff6abff8
|
1683 |
mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e18
|
1684 1685 |
if (!mod->holders_dir) { err = -ENOMEM; |
270a6c4ca
|
1686 |
goto out_unreg; |
240936e18
|
1687 |
} |
270a6c4ca
|
1688 |
|
1da177e4c
|
1689 1690 |
err = module_param_sysfs_setup(mod, kparam, num_params); if (err) |
270a6c4ca
|
1691 |
goto out_unreg_holders; |
1da177e4c
|
1692 |
|
c988d2b28
|
1693 1694 |
err = module_add_modinfo_attrs(mod); if (err) |
e17e0f51a
|
1695 |
goto out_unreg_param; |
c988d2b28
|
1696 |
|
80a3d1bb4
|
1697 |
add_usage_links(mod); |
8f6d03781
|
1698 1699 |
add_sect_attrs(mod, info); add_notes_attrs(mod, info); |
80a3d1bb4
|
1700 |
|
e17e0f51a
|
1701 |
kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4c
|
1702 |
return 0; |
e17e0f51a
|
1703 1704 |
out_unreg_param: module_param_sysfs_remove(mod); |
270a6c4ca
|
1705 |
out_unreg_holders: |
78a2d906b
|
1706 |
kobject_put(mod->holders_dir); |
270a6c4ca
|
1707 |
out_unreg: |
942e44312
|
1708 |
mod_kobject_put(mod); |
80a3d1bb4
|
1709 |
out: |
1da177e4c
|
1710 1711 |
return err; } |
34e4e2fef
|
1712 1713 1714 |
static void mod_sysfs_fini(struct module *mod) { |
8f6d03781
|
1715 1716 |
remove_notes_attrs(mod); remove_sect_attrs(mod); |
942e44312
|
1717 |
mod_kobject_put(mod); |
34e4e2fef
|
1718 |
} |
cf2fde7b3
|
1719 1720 1721 1722 |
static void init_param_lock(struct module *mod) { mutex_init(&mod->param_lock); } |
8f6d03781
|
1723 |
#else /* !CONFIG_SYSFS */ |
34e4e2fef
|
1724 |
|
8f6d03781
|
1725 1726 |
static int mod_sysfs_setup(struct module *mod, const struct load_info *info, |
6407ebb27
|
1727 1728 1729 1730 1731 |
struct kernel_param *kparam, unsigned int num_params) { return 0; } |
34e4e2fef
|
1732 1733 1734 |
static void mod_sysfs_fini(struct module *mod) { } |
36b0360d1
|
1735 1736 1737 |
static void module_remove_modinfo_attrs(struct module *mod) { } |
80a3d1bb4
|
1738 1739 1740 |
static void del_usage_links(struct module *mod) { } |
cf2fde7b3
|
1741 1742 1743 |
static void init_param_lock(struct module *mod) { } |
34e4e2fef
|
1744 |
#endif /* CONFIG_SYSFS */ |
1da177e4c
|
1745 |
|
36b0360d1
|
1746 |
static void mod_sysfs_teardown(struct module *mod) |
1da177e4c
|
1747 |
{ |
80a3d1bb4
|
1748 |
del_usage_links(mod); |
c988d2b28
|
1749 |
module_remove_modinfo_attrs(mod); |
1da177e4c
|
1750 |
module_param_sysfs_remove(mod); |
78a2d906b
|
1751 1752 |
kobject_put(mod->mkobj.drivers_dir); kobject_put(mod->holders_dir); |
34e4e2fef
|
1753 |
mod_sysfs_fini(mod); |
1da177e4c
|
1754 |
} |
84e1c6bb3
|
1755 1756 1757 1758 |
#ifdef CONFIG_DEBUG_SET_MODULE_RONX /* * LKM RO/NX protection: protect module's text/ro-data * from modification and any data from execution. |
85c898db6
|
1759 1760 1761 1762 1763 1764 1765 1766 |
* * General layout of module is: * [text] [read-only-data] [writable data] * text_size -----^ ^ ^ * ro_size ------------------------| | * size -------------------------------------------| * * These values are always page-aligned (as is base) |
84e1c6bb3
|
1767 |
*/ |
85c898db6
|
1768 1769 |
static void frob_text(const struct module_layout *layout, int (*set_memory)(unsigned long start, int num_pages)) |
84e1c6bb3
|
1770 |
{ |
85c898db6
|
1771 1772 1773 1774 |
BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); set_memory((unsigned long)layout->base, layout->text_size >> PAGE_SHIFT); |
84e1c6bb3
|
1775 |
} |
84e1c6bb3
|
1776 |
|
85c898db6
|
1777 1778 |
static void frob_rodata(const struct module_layout *layout, int (*set_memory)(unsigned long start, int num_pages)) |
84e1c6bb3
|
1779 |
{ |
85c898db6
|
1780 1781 1782 1783 1784 |
BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); set_memory((unsigned long)layout->base + layout->text_size, (layout->ro_size - layout->text_size) >> PAGE_SHIFT); |
84e1c6bb3
|
1785 |
} |
85c898db6
|
1786 1787 |
static void frob_writable_data(const struct module_layout *layout, int (*set_memory)(unsigned long start, int num_pages)) |
84e1c6bb3
|
1788 |
{ |
85c898db6
|
1789 1790 1791 1792 1793 |
BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); set_memory((unsigned long)layout->base + layout->ro_size, (layout->size - layout->ro_size) >> PAGE_SHIFT); |
84e1c6bb3
|
1794 |
} |
84e1c6bb3
|
1795 |
|
85c898db6
|
1796 1797 |
/* livepatching wants to disable read-only so it can frob module. */ void module_disable_ro(const struct module *mod) |
20ef10c1b
|
1798 |
{ |
85c898db6
|
1799 1800 1801 1802 |
frob_text(&mod->core_layout, set_memory_rw); frob_rodata(&mod->core_layout, set_memory_rw); frob_text(&mod->init_layout, set_memory_rw); frob_rodata(&mod->init_layout, set_memory_rw); |
20ef10c1b
|
1803 |
} |
84e1c6bb3
|
1804 |
|
85c898db6
|
1805 |
void module_enable_ro(const struct module *mod) |
01526ed08
|
1806 |
{ |
85c898db6
|
1807 1808 1809 1810 |
frob_text(&mod->core_layout, set_memory_ro); frob_rodata(&mod->core_layout, set_memory_ro); frob_text(&mod->init_layout, set_memory_ro); frob_rodata(&mod->init_layout, set_memory_ro); |
84e1c6bb3
|
1811 |
} |
85c898db6
|
1812 |
static void module_enable_nx(const struct module *mod) |
01526ed08
|
1813 |
{ |
85c898db6
|
1814 1815 1816 1817 |
frob_rodata(&mod->core_layout, set_memory_nx); frob_writable_data(&mod->core_layout, set_memory_nx); frob_rodata(&mod->init_layout, set_memory_nx); frob_writable_data(&mod->init_layout, set_memory_nx); |
01526ed08
|
1818 |
} |
85c898db6
|
1819 |
static void module_disable_nx(const struct module *mod) |
01526ed08
|
1820 |
{ |
85c898db6
|
1821 1822 1823 1824 |
frob_rodata(&mod->core_layout, set_memory_x); frob_writable_data(&mod->core_layout, set_memory_x); frob_rodata(&mod->init_layout, set_memory_x); frob_writable_data(&mod->init_layout, set_memory_x); |
84e1c6bb3
|
1825 1826 1827 |
} /* Iterate through all modules and set each module's text as RW */ |
5d05c7084
|
1828 |
void set_all_modules_text_rw(void) |
84e1c6bb3
|
1829 1830 1831 1832 1833 |
{ struct module *mod; mutex_lock(&module_mutex); list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e34
|
1834 1835 |
if (mod->state == MODULE_STATE_UNFORMED) continue; |
85c898db6
|
1836 1837 1838 |
frob_text(&mod->core_layout, set_memory_rw); frob_text(&mod->init_layout, set_memory_rw); |
84e1c6bb3
|
1839 1840 1841 1842 1843 |
} mutex_unlock(&module_mutex); } /* Iterate through all modules and set each module's text as RO */ |
5d05c7084
|
1844 |
void set_all_modules_text_ro(void) |
84e1c6bb3
|
1845 1846 1847 1848 1849 |
{ struct module *mod; mutex_lock(&module_mutex); list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e34
|
1850 1851 |
if (mod->state == MODULE_STATE_UNFORMED) continue; |
85c898db6
|
1852 1853 1854 |
frob_text(&mod->core_layout, set_memory_ro); frob_text(&mod->init_layout, set_memory_ro); |
84e1c6bb3
|
1855 1856 1857 |
} mutex_unlock(&module_mutex); } |
85c898db6
|
1858 1859 1860 1861 1862 1863 1864 1865 |
static void disable_ro_nx(const struct module_layout *layout) { frob_text(layout, set_memory_rw); frob_rodata(layout, set_memory_rw); frob_rodata(layout, set_memory_x); frob_writable_data(layout, set_memory_x); } |
84e1c6bb3
|
1866 |
#else |
85c898db6
|
1867 1868 1869 |
static void disable_ro_nx(const struct module_layout *layout) { } static void module_enable_nx(const struct module *mod) { } static void module_disable_nx(const struct module *mod) { } |
84e1c6bb3
|
1870 |
#endif |
be1f221c0
|
1871 |
void __weak module_memfree(void *module_region) |
74e08fcf7
|
1872 1873 1874 1875 1876 1877 1878 |
{ vfree(module_region); } void __weak module_arch_cleanup(struct module *mod) { } |
d453cded0
|
1879 1880 1881 |
void __weak module_arch_freeing_init(struct module *mod) { } |
75676500f
|
1882 |
/* Free a module, remove from lists, etc. */ |
1da177e4c
|
1883 1884 |
static void free_module(struct module *mod) { |
7ead8b831
|
1885 |
trace_module_free(mod); |
36b0360d1
|
1886 |
mod_sysfs_teardown(mod); |
1da177e4c
|
1887 |
|
944a1fa01
|
1888 1889 |
/* We leave it in list to prevent duplicate loads, but make sure * that noone uses it while it's being deconstructed. */ |
d3051b489
|
1890 |
mutex_lock(&module_mutex); |
944a1fa01
|
1891 |
mod->state = MODULE_STATE_UNFORMED; |
d3051b489
|
1892 |
mutex_unlock(&module_mutex); |
944a1fa01
|
1893 |
|
b82bab4bb
|
1894 1895 |
/* Remove dynamic debug info */ ddebug_remove_module(mod->name); |
1da177e4c
|
1896 1897 1898 1899 1900 |
/* Arch-specific cleanup. */ module_arch_cleanup(mod); /* Module unload stuff */ module_unload_free(mod); |
e180a6b77
|
1901 1902 |
/* Free any allocated parameters. */ destroy_params(mod->kp, mod->num_kp); |
944a1fa01
|
1903 1904 |
/* Now we can delete it from the lists */ mutex_lock(&module_mutex); |
461e34aed
|
1905 1906 |
/* Unlink carefully: kallsyms could be walking list. */ list_del_rcu(&mod->list); |
93c2e105f
|
1907 |
mod_tree_remove(mod); |
0286b5ea1
|
1908 |
/* Remove this module from bug list, this uses list_del_rcu */ |
461e34aed
|
1909 |
module_bug_cleanup(mod); |
0be964be0
|
1910 1911 |
/* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ synchronize_sched(); |
944a1fa01
|
1912 |
mutex_unlock(&module_mutex); |
85c898db6
|
1913 1914 |
/* This may be empty, but that's OK */ disable_ro_nx(&mod->init_layout); |
d453cded0
|
1915 |
module_arch_freeing_init(mod); |
7523e4dc5
|
1916 |
module_memfree(mod->init_layout.base); |
1da177e4c
|
1917 |
kfree(mod->args); |
259354dea
|
1918 |
percpu_modfree(mod); |
9f85a4bbb
|
1919 |
|
35a9393c9
|
1920 |
/* Free lock-classes; relies on the preceding sync_rcu(). */ |
7523e4dc5
|
1921 |
lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
fbb9ce953
|
1922 |
|
1da177e4c
|
1923 |
/* Finally, free the core (containing the module structure) */ |
85c898db6
|
1924 |
disable_ro_nx(&mod->core_layout); |
7523e4dc5
|
1925 |
module_memfree(mod->core_layout.base); |
eb8cdec4a
|
1926 1927 1928 1929 |
#ifdef CONFIG_MPU update_protections(current->mm); #endif |
1da177e4c
|
1930 1931 1932 1933 1934 |
} void *__symbol_get(const char *symbol) { struct module *owner; |
414fd31b2
|
1935 |
const struct kernel_symbol *sym; |
1da177e4c
|
1936 |
|
24da1cbff
|
1937 |
preempt_disable(); |
414fd31b2
|
1938 1939 1940 |
sym = find_symbol(symbol, &owner, NULL, true, true); if (sym && strong_try_module_get(owner)) sym = NULL; |
24da1cbff
|
1941 |
preempt_enable(); |
1da177e4c
|
1942 |
|
414fd31b2
|
1943 |
return sym ? (void *)sym->value : NULL; |
1da177e4c
|
1944 1945 |
} EXPORT_SYMBOL_GPL(__symbol_get); |
eea8b54dc
|
1946 1947 |
/* * Ensure that an exported symbol [global namespace] does not already exist |
02a3e59a0
|
1948 |
* in the kernel or in some other module's exported symbol table. |
be593f4ce
|
1949 1950 |
* * You must hold the module_mutex. |
eea8b54dc
|
1951 1952 1953 |
*/ static int verify_export_symbols(struct module *mod) { |
b211104d1
|
1954 |
unsigned int i; |
eea8b54dc
|
1955 |
struct module *owner; |
b211104d1
|
1956 1957 1958 1959 1960 1961 1962 1963 |
const struct kernel_symbol *s; struct { const struct kernel_symbol *sym; unsigned int num; } arr[] = { { mod->syms, mod->num_syms }, { mod->gpl_syms, mod->num_gpl_syms }, { mod->gpl_future_syms, mod->num_gpl_future_syms }, |
f7f5b6755
|
1964 |
#ifdef CONFIG_UNUSED_SYMBOLS |
b211104d1
|
1965 1966 |
{ mod->unused_syms, mod->num_unused_syms }, { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, |
f7f5b6755
|
1967 |
#endif |
b211104d1
|
1968 |
}; |
eea8b54dc
|
1969 |
|
b211104d1
|
1970 1971 |
for (i = 0; i < ARRAY_SIZE(arr); i++) { for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { |
be593f4ce
|
1972 |
if (find_symbol(s->name, &owner, NULL, true, false)) { |
bddb12b32
|
1973 |
pr_err("%s: exports duplicate symbol %s" |
b211104d1
|
1974 1975 1976 1977 1978 |
" (owned by %s) ", mod->name, s->name, module_name(owner)); return -ENOEXEC; } |
eea8b54dc
|
1979 |
} |
b211104d1
|
1980 1981 |
} return 0; |
eea8b54dc
|
1982 |
} |
9a4b9708f
|
1983 |
/* Change all symbols so that st_value encodes the pointer directly. */ |
49668688d
|
1984 1985 1986 1987 |
static int simplify_symbols(struct module *mod, const struct load_info *info) { Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; Elf_Sym *sym = (void *)symsec->sh_addr; |
1da177e4c
|
1988 |
unsigned long secbase; |
49668688d
|
1989 |
unsigned int i; |
1da177e4c
|
1990 |
int ret = 0; |
414fd31b2
|
1991 |
const struct kernel_symbol *ksym; |
1da177e4c
|
1992 |
|
49668688d
|
1993 1994 |
for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { const char *name = info->strtab + sym[i].st_name; |
1da177e4c
|
1995 1996 |
switch (sym[i].st_shndx) { case SHN_COMMON: |
80375980f
|
1997 1998 1999 |
/* Ignore common symbols */ if (!strncmp(name, "__gnu_lto", 9)) break; |
1da177e4c
|
2000 2001 |
/* We compiled with -fno-common. These are not supposed to happen. */ |
5e1241692
|
2002 2003 |
pr_debug("Common symbol: %s ", name); |
6da0b5651
|
2004 2005 |
pr_warn("%s: please compile with -fno-common ", |
1da177e4c
|
2006 2007 2008 2009 2010 2011 |
mod->name); ret = -ENOEXEC; break; case SHN_ABS: /* Don't need to do anything */ |
5e1241692
|
2012 2013 |
pr_debug("Absolute symbol: 0x%08lx ", |
1da177e4c
|
2014 2015 2016 2017 |
(long)sym[i].st_value); break; case SHN_UNDEF: |
49668688d
|
2018 |
ksym = resolve_symbol_wait(mod, info, name); |
1da177e4c
|
2019 |
/* Ok if resolved. */ |
9bea7f239
|
2020 |
if (ksym && !IS_ERR(ksym)) { |
414fd31b2
|
2021 |
sym[i].st_value = ksym->value; |
1da177e4c
|
2022 |
break; |
414fd31b2
|
2023 |
} |
1da177e4c
|
2024 |
/* Ok if weak. */ |
9bea7f239
|
2025 |
if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4c
|
2026 |
break; |
bddb12b32
|
2027 2028 2029 |
pr_warn("%s: Unknown symbol %s (err %li) ", mod->name, name, PTR_ERR(ksym)); |
9bea7f239
|
2030 |
ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4c
|
2031 2032 2033 2034 |
break; default: /* Divert to percpu allocation if a percpu var. */ |
49668688d
|
2035 |
if (sym[i].st_shndx == info->index.pcpu) |
259354dea
|
2036 |
secbase = (unsigned long)mod_percpu(mod); |
1da177e4c
|
2037 |
else |
49668688d
|
2038 |
secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4c
|
2039 2040 2041 2042 2043 2044 2045 |
sym[i].st_value += secbase; break; } } return ret; } |
49668688d
|
2046 |
static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268ebe
|
2047 2048 2049 2050 2051 |
{ unsigned int i; int err = 0; /* Now do relocations. */ |
49668688d
|
2052 2053 |
for (i = 1; i < info->hdr->e_shnum; i++) { unsigned int infosec = info->sechdrs[i].sh_info; |
22e268ebe
|
2054 2055 |
/* Not a valid relocation section? */ |
49668688d
|
2056 |
if (infosec >= info->hdr->e_shnum) |
22e268ebe
|
2057 2058 2059 |
continue; /* Don't bother with non-allocated sections */ |
49668688d
|
2060 |
if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268ebe
|
2061 |
continue; |
49668688d
|
2062 2063 2064 2065 2066 2067 |
if (info->sechdrs[i].sh_type == SHT_REL) err = apply_relocate(info->sechdrs, info->strtab, info->index.sym, i, mod); else if (info->sechdrs[i].sh_type == SHT_RELA) err = apply_relocate_add(info->sechdrs, info->strtab, info->index.sym, i, mod); |
22e268ebe
|
2068 2069 2070 2071 2072 |
if (err < 0) break; } return err; } |
088af9a6e
|
2073 2074 2075 2076 2077 2078 2079 |
/* Additional bytes needed by arch in front of individual sections */ unsigned int __weak arch_mod_section_prepend(struct module *mod, unsigned int section) { /* default implementation just returns zero */ return 0; } |
1da177e4c
|
2080 |
/* Update size with this section: return offset. */ |
088af9a6e
|
2081 2082 |
static long get_offset(struct module *mod, unsigned int *size, Elf_Shdr *sechdr, unsigned int section) |
1da177e4c
|
2083 2084 |
{ long ret; |
088af9a6e
|
2085 |
*size += arch_mod_section_prepend(mod, section); |
1da177e4c
|
2086 2087 2088 2089 2090 2091 2092 2093 2094 |
ret = ALIGN(*size, sechdr->sh_addralign ?: 1); *size = ret + sechdr->sh_size; return ret; } /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld might -- code, read-only data, read-write data, small data. Tally sizes, and place the offsets into sh_entsize fields: high bit means it belongs in init. */ |
49668688d
|
2095 |
static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4c
|
2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 |
{ static unsigned long const masks[][2] = { /* NOTE: all executable code must be the first section * in this array; otherwise modify the text_size * finder in the two loops below */ { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, { ARCH_SHF_SMALL | SHF_ALLOC, 0 } }; unsigned int m, i; |
49668688d
|
2107 2108 |
for (i = 0; i < info->hdr->e_shnum; i++) info->sechdrs[i].sh_entsize = ~0UL; |
1da177e4c
|
2109 |
|
5e1241692
|
2110 2111 |
pr_debug("Core section allocation order: "); |
1da177e4c
|
2112 |
for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688d
|
2113 2114 2115 |
for (i = 0; i < info->hdr->e_shnum; ++i) { Elf_Shdr *s = &info->sechdrs[i]; const char *sname = info->secstrings + s->sh_name; |
1da177e4c
|
2116 2117 2118 2119 |
if ((s->sh_flags & masks[m][0]) != masks[m][0] || (s->sh_flags & masks[m][1]) || s->sh_entsize != ~0UL |
49668688d
|
2120 |
|| strstarts(sname, ".init")) |
1da177e4c
|
2121 |
continue; |
7523e4dc5
|
2122 |
s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
5e1241692
|
2123 2124 |
pr_debug("\t%s ", sname); |
1da177e4c
|
2125 |
} |
84e1c6bb3
|
2126 2127 |
switch (m) { case 0: /* executable */ |
7523e4dc5
|
2128 2129 |
mod->core_layout.size = debug_align(mod->core_layout.size); mod->core_layout.text_size = mod->core_layout.size; |
84e1c6bb3
|
2130 2131 |
break; case 1: /* RO: text and ro-data */ |
7523e4dc5
|
2132 2133 |
mod->core_layout.size = debug_align(mod->core_layout.size); mod->core_layout.ro_size = mod->core_layout.size; |
84e1c6bb3
|
2134 2135 |
break; case 3: /* whole core */ |
7523e4dc5
|
2136 |
mod->core_layout.size = debug_align(mod->core_layout.size); |
84e1c6bb3
|
2137 2138 |
break; } |
1da177e4c
|
2139 |
} |
5e1241692
|
2140 2141 |
pr_debug("Init section allocation order: "); |
1da177e4c
|
2142 |
for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688d
|
2143 2144 2145 |
for (i = 0; i < info->hdr->e_shnum; ++i) { Elf_Shdr *s = &info->sechdrs[i]; const char *sname = info->secstrings + s->sh_name; |
1da177e4c
|
2146 2147 2148 2149 |
if ((s->sh_flags & masks[m][0]) != masks[m][0] || (s->sh_flags & masks[m][1]) || s->sh_entsize != ~0UL |
49668688d
|
2150 |
|| !strstarts(sname, ".init")) |
1da177e4c
|
2151 |
continue; |
7523e4dc5
|
2152 |
s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
1da177e4c
|
2153 |
| INIT_OFFSET_MASK); |
5e1241692
|
2154 2155 |
pr_debug("\t%s ", sname); |
1da177e4c
|
2156 |
} |
84e1c6bb3
|
2157 2158 |
switch (m) { case 0: /* executable */ |
7523e4dc5
|
2159 2160 |
mod->init_layout.size = debug_align(mod->init_layout.size); mod->init_layout.text_size = mod->init_layout.size; |
84e1c6bb3
|
2161 2162 |
break; case 1: /* RO: text and ro-data */ |
7523e4dc5
|
2163 2164 |
mod->init_layout.size = debug_align(mod->init_layout.size); mod->init_layout.ro_size = mod->init_layout.size; |
84e1c6bb3
|
2165 2166 |
break; case 3: /* whole init */ |
7523e4dc5
|
2167 |
mod->init_layout.size = debug_align(mod->init_layout.size); |
84e1c6bb3
|
2168 2169 |
break; } |
1da177e4c
|
2170 2171 |
} } |
1da177e4c
|
2172 2173 2174 2175 |
static void set_license(struct module *mod, const char *license) { if (!license) license = "unspecified"; |
fa3ba2e81
|
2176 |
if (!license_is_gpl_compatible(license)) { |
25ddbb18a
|
2177 |
if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
bddb12b32
|
2178 2179 2180 |
pr_warn("%s: module license '%s' taints kernel. ", mod->name, license); |
373d4d099
|
2181 2182 |
add_taint_module(mod, TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
1da177e4c
|
2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 |
} } /* Parse tag=value strings from .modinfo section */ static char *next_string(char *string, unsigned long *secsize) { /* Skip non-zero chars */ while (string[0]) { string++; if ((*secsize)-- <= 1) return NULL; } /* Skip any zero padding. */ while (!string[0]) { string++; if ((*secsize)-- <= 1) return NULL; } return string; } |
49668688d
|
2204 |
static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4c
|
2205 2206 2207 |
{ char *p; unsigned int taglen = strlen(tag); |
49668688d
|
2208 2209 |
Elf_Shdr *infosec = &info->sechdrs[info->index.info]; unsigned long size = infosec->sh_size; |
1da177e4c
|
2210 |
|
49668688d
|
2211 |
for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4c
|
2212 2213 2214 2215 2216 |
if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') return p + taglen + 1; } return NULL; } |
49668688d
|
2217 |
static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b28
|
2218 2219 2220 2221 2222 2223 |
{ struct module_attribute *attr; int i; for (i = 0; (attr = modinfo_attrs[i]); i++) { if (attr->setup) |
49668688d
|
2224 |
attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b28
|
2225 2226 |
} } |
c988d2b28
|
2227 |
|
a263f7763
|
2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 |
static void free_modinfo(struct module *mod) { struct module_attribute *attr; int i; for (i = 0; (attr = modinfo_attrs[i]); i++) { if (attr->free) attr->free(mod); } } |
1da177e4c
|
2238 |
#ifdef CONFIG_KALLSYMS |
15bba37d6
|
2239 2240 2241 2242 2243 2244 |
/* 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) { |
9d63487f8
|
2245 2246 |
return bsearch(name, start, stop - start, sizeof(struct kernel_symbol), cmp_name); |
15bba37d6
|
2247 |
} |
ca4787b77
|
2248 2249 |
static int is_exported(const char *name, unsigned long value, const struct module *mod) |
1da177e4c
|
2250 |
{ |
ca4787b77
|
2251 2252 2253 |
const struct kernel_symbol *ks; if (!mod) ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); |
3fd6805f4
|
2254 |
else |
ca4787b77
|
2255 2256 |
ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); return ks != NULL && ks->value == value; |
1da177e4c
|
2257 2258 2259 |
} /* As per nm */ |
eded41c1c
|
2260 |
static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4c
|
2261 |
{ |
eded41c1c
|
2262 |
const Elf_Shdr *sechdrs = info->sechdrs; |
1da177e4c
|
2263 2264 2265 2266 2267 2268 2269 2270 |
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'; |
e02244185
|
2271 |
if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
1da177e4c
|
2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 |
return 'a'; if (sym->st_shndx >= SHN_LORESERVE) return '?'; if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) return 't'; if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) return 'r'; else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) return 'g'; else return 'd'; } if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) return 's'; else return 'b'; } |
eded41c1c
|
2292 2293 |
if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, ".debug")) { |
1da177e4c
|
2294 |
return 'n'; |
eded41c1c
|
2295 |
} |
1da177e4c
|
2296 2297 |
return '?'; } |
4a4962263
|
2298 |
static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
e02244185
|
2299 |
unsigned int shnum, unsigned int pcpundx) |
4a4962263
|
2300 2301 2302 2303 2304 2305 2306 |
{ const Elf_Shdr *sec; if (src->st_shndx == SHN_UNDEF || src->st_shndx >= shnum || !src->st_name) return false; |
e02244185
|
2307 2308 2309 2310 |
#ifdef CONFIG_KALLSYMS_ALL if (src->st_shndx == pcpundx) return true; #endif |
4a4962263
|
2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 |
sec = sechdrs + src->st_shndx; if (!(sec->sh_flags & SHF_ALLOC) #ifndef CONFIG_KALLSYMS_ALL || !(sec->sh_flags & SHF_EXECINSTR) #endif || (sec->sh_entsize & INIT_OFFSET_MASK)) return false; return true; } |
48fd11880
|
2321 2322 2323 2324 2325 2326 2327 |
/* * We only allocate and copy the strings needed by the parts of symtab * we keep. This is simple, but has the effect of making multiple * copies of duplicates. We could be more sophisticated, see * linux-kernel thread starting with * <73defb5e4bca04a6431392cc341112b1@localhost>. */ |
49668688d
|
2328 |
static void layout_symtab(struct module *mod, struct load_info *info) |
4a4962263
|
2329 |
{ |
49668688d
|
2330 2331 |
Elf_Shdr *symsect = info->sechdrs + info->index.sym; Elf_Shdr *strsect = info->sechdrs + info->index.str; |
4a4962263
|
2332 |
const Elf_Sym *src; |
54523ec71
|
2333 |
unsigned int i, nsrc, ndst, strtab_size = 0; |
4a4962263
|
2334 2335 2336 |
/* Put symbol section at end of init part of module. */ symsect->sh_flags |= SHF_ALLOC; |
7523e4dc5
|
2337 |
symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
49668688d
|
2338 |
info->index.sym) | INIT_OFFSET_MASK; |
5e1241692
|
2339 2340 |
pr_debug("\t%s ", info->secstrings + symsect->sh_name); |
4a4962263
|
2341 |
|
49668688d
|
2342 |
src = (void *)info->hdr + symsect->sh_offset; |
4a4962263
|
2343 |
nsrc = symsect->sh_size / sizeof(*src); |
70b1e9161
|
2344 |
|
48fd11880
|
2345 |
/* Compute total space required for the core symbols' strtab. */ |
59ef28b1f
|
2346 2347 |
for (ndst = i = 0; i < nsrc; i++) { if (i == 0 || |
e02244185
|
2348 2349 |
is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, info->index.pcpu)) { |
59ef28b1f
|
2350 |
strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
48fd11880
|
2351 |
ndst++; |
554bdfe5a
|
2352 |
} |
59ef28b1f
|
2353 |
} |
4a4962263
|
2354 2355 |
/* Append room for core symbols at end of core part. */ |
7523e4dc5
|
2356 2357 2358 2359 |
info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); mod->core_layout.size += strtab_size; mod->core_layout.size = debug_align(mod->core_layout.size); |
4a4962263
|
2360 |
|
554bdfe5a
|
2361 2362 |
/* Put string table section at end of init part of module. */ strsect->sh_flags |= SHF_ALLOC; |
7523e4dc5
|
2363 |
strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
49668688d
|
2364 |
info->index.str) | INIT_OFFSET_MASK; |
7523e4dc5
|
2365 |
mod->init_layout.size = debug_align(mod->init_layout.size); |
5e1241692
|
2366 2367 |
pr_debug("\t%s ", info->secstrings + strsect->sh_name); |
4a4962263
|
2368 |
} |
811d66a0e
|
2369 |
static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4c
|
2370 |
{ |
4a4962263
|
2371 2372 2373 |
unsigned int i, ndst; const Elf_Sym *src; Elf_Sym *dst; |
554bdfe5a
|
2374 |
char *s; |
eded41c1c
|
2375 |
Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4c
|
2376 |
|
eded41c1c
|
2377 2378 |
mod->symtab = (void *)symsec->sh_addr; mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); |
511ca6ae4
|
2379 2380 |
/* Make sure we get permanent strtab: don't use info->strtab. */ mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
1da177e4c
|
2381 2382 2383 |
/* Set types up while we still have access to sections. */ for (i = 0; i < mod->num_symtab; i++) |
eded41c1c
|
2384 |
mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a4962263
|
2385 |
|
7523e4dc5
|
2386 2387 |
mod->core_symtab = dst = mod->core_layout.base + info->symoffs; mod->core_strtab = s = mod->core_layout.base + info->stroffs; |
4a4962263
|
2388 |
src = mod->symtab; |
59ef28b1f
|
2389 2390 |
for (ndst = i = 0; i < mod->num_symtab; i++) { if (i == 0 || |
e02244185
|
2391 2392 |
is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, info->index.pcpu)) { |
59ef28b1f
|
2393 2394 2395 2396 2397 |
dst[ndst] = src[i]; dst[ndst++].st_name = s - mod->core_strtab; s += strlcpy(s, &mod->strtab[src[i].st_name], KSYM_NAME_LEN) + 1; } |
4a4962263
|
2398 2399 |
} mod->core_num_syms = ndst; |
1da177e4c
|
2400 2401 |
} #else |
49668688d
|
2402 |
static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a4962263
|
2403 2404 |
{ } |
3ae91c21d
|
2405 |
|
abbce906d
|
2406 |
static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4c
|
2407 2408 2409 |
{ } #endif /* CONFIG_KALLSYMS */ |
e9d376f0f
|
2410 |
static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15beb
|
2411 |
{ |
811d66a0e
|
2412 2413 |
if (!debug) return; |
e9d376f0f
|
2414 2415 |
#ifdef CONFIG_DYNAMIC_DEBUG if (ddebug_add_module(debug, num, debug->modname)) |
bddb12b32
|
2416 2417 2418 |
pr_err("dynamic debug error adding module: %s ", debug->modname); |
e9d376f0f
|
2419 |
#endif |
5e458cc0f
|
2420 |
} |
346e15beb
|
2421 |
|
ff49d74ad
|
2422 2423 2424 2425 2426 |
static void dynamic_debug_remove(struct _ddebug *debug) { if (debug) ddebug_remove_module(debug->modname); } |
74e08fcf7
|
2427 2428 |
void * __weak module_alloc(unsigned long size) { |
82fab442f
|
2429 |
return vmalloc_exec(size); |
74e08fcf7
|
2430 |
} |
4f2294b6d
|
2431 |
#ifdef CONFIG_DEBUG_KMEMLEAK |
49668688d
|
2432 2433 |
static void kmemleak_load_module(const struct module *mod, const struct load_info *info) |
4f2294b6d
|
2434 2435 2436 2437 |
{ unsigned int i; /* only scan the sections containing data */ |
c017b4be3
|
2438 |
kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6d
|
2439 |
|
49668688d
|
2440 |
for (i = 1; i < info->hdr->e_shnum; i++) { |
06c9494c0
|
2441 2442 2443 2444 |
/* Scan all writable sections that's not executable */ if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || !(info->sechdrs[i].sh_flags & SHF_WRITE) || (info->sechdrs[i].sh_flags & SHF_EXECINSTR)) |
4f2294b6d
|
2445 |
continue; |
49668688d
|
2446 2447 |
kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, info->sechdrs[i].sh_size, GFP_KERNEL); |
4f2294b6d
|
2448 2449 2450 |
} } #else |
49668688d
|
2451 2452 |
static inline void kmemleak_load_module(const struct module *mod, const struct load_info *info) |
4f2294b6d
|
2453 2454 2455 |
{ } #endif |
106a4ee25
|
2456 |
#ifdef CONFIG_MODULE_SIG |
34e1169d9
|
2457 |
static int module_sig_check(struct load_info *info) |
106a4ee25
|
2458 2459 |
{ int err = -ENOKEY; |
34e1169d9
|
2460 2461 |
const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; const void *mod = info->hdr; |
caabe2405
|
2462 |
|
34e1169d9
|
2463 2464 |
if (info->len > markerlen && memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
caabe2405
|
2465 |
/* We truncate the module to discard the signature */ |
34e1169d9
|
2466 2467 |
info->len -= markerlen; err = mod_verify_sig(mod, &info->len); |
106a4ee25
|
2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 |
} if (!err) { info->sig_ok = true; return 0; } /* Not having a signature is only an error if we're strict. */ if (err == -ENOKEY && !sig_enforce) err = 0; return err; } #else /* !CONFIG_MODULE_SIG */ |
34e1169d9
|
2482 |
static int module_sig_check(struct load_info *info) |
106a4ee25
|
2483 2484 2485 2486 |
{ return 0; } #endif /* !CONFIG_MODULE_SIG */ |
34e1169d9
|
2487 2488 |
/* Sanity checks against invalid binaries, wrong arch, weird elf version. */ static int elf_header_check(struct load_info *info) |
40dd2560e
|
2489 |
{ |
34e1169d9
|
2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 |
if (info->len < sizeof(*(info->hdr))) return -ENOEXEC; if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 || info->hdr->e_type != ET_REL || !elf_check_arch(info->hdr) || info->hdr->e_shentsize != sizeof(Elf_Shdr)) return -ENOEXEC; if (info->hdr->e_shoff >= info->len || (info->hdr->e_shnum * sizeof(Elf_Shdr) > info->len - info->hdr->e_shoff)) return -ENOEXEC; |
40dd2560e
|
2503 |
|
34e1169d9
|
2504 2505 |
return 0; } |
3afe9f849
|
2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 |
#define COPY_CHUNK_SIZE (16*PAGE_SIZE) static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) { do { unsigned long n = min(len, COPY_CHUNK_SIZE); if (copy_from_user(dst, usrc, n) != 0) return -EFAULT; cond_resched(); dst += n; usrc += n; len -= n; } while (len); return 0; } |
34e1169d9
|
2522 2523 2524 |
/* Sets info->hdr and info->len. */ static int copy_module_from_user(const void __user *umod, unsigned long len, struct load_info *info) |
40dd2560e
|
2525 2526 |
{ int err; |
40dd2560e
|
2527 |
|
34e1169d9
|
2528 2529 |
info->len = len; if (info->len < sizeof(*(info->hdr))) |
40dd2560e
|
2530 |
return -ENOEXEC; |
2e72d51b4
|
2531 2532 2533 |
err = security_kernel_module_from_file(NULL); if (err) return err; |
40dd2560e
|
2534 |
/* Suck in entire file: we'll want most of it. */ |
cc9e605dc
|
2535 2536 |
info->hdr = __vmalloc(info->len, GFP_KERNEL | __GFP_HIGHMEM | __GFP_NOWARN, PAGE_KERNEL); |
34e1169d9
|
2537 |
if (!info->hdr) |
40dd2560e
|
2538 |
return -ENOMEM; |
3afe9f849
|
2539 |
if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
34e1169d9
|
2540 2541 |
vfree(info->hdr); return -EFAULT; |
40dd2560e
|
2542 |
} |
34e1169d9
|
2543 2544 2545 2546 2547 2548 |
return 0; } /* Sets info->hdr and info->len. */ static int copy_module_from_fd(int fd, struct load_info *info) { |
a2e0578be
|
2549 |
struct fd f = fdget(fd); |
34e1169d9
|
2550 2551 2552 2553 |
int err; struct kstat stat; loff_t pos; ssize_t bytes = 0; |
a2e0578be
|
2554 |
if (!f.file) |
34e1169d9
|
2555 |
return -ENOEXEC; |
a2e0578be
|
2556 |
err = security_kernel_module_from_file(f.file); |
106a4ee25
|
2557 |
if (err) |
2e72d51b4
|
2558 |
goto out; |
106a4ee25
|
2559 |
|
a2e0578be
|
2560 |
err = vfs_getattr(&f.file->f_path, &stat); |
106a4ee25
|
2561 |
if (err) |
34e1169d9
|
2562 |
goto out; |
40dd2560e
|
2563 |
|
34e1169d9
|
2564 2565 2566 |
if (stat.size > INT_MAX) { err = -EFBIG; goto out; |
40dd2560e
|
2567 |
} |
52441fa8f
|
2568 2569 2570 2571 2572 2573 |
/* Don't hand 0 to vmalloc, it whines. */ if (stat.size == 0) { err = -EINVAL; goto out; } |
34e1169d9
|
2574 2575 2576 2577 |
info->hdr = vmalloc(stat.size); if (!info->hdr) { err = -ENOMEM; goto out; |
40dd2560e
|
2578 |
} |
d913188c7
|
2579 |
|
34e1169d9
|
2580 2581 |
pos = 0; while (pos < stat.size) { |
a2e0578be
|
2582 |
bytes = kernel_read(f.file, pos, (char *)(info->hdr) + pos, |
34e1169d9
|
2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 |
stat.size - pos); if (bytes < 0) { vfree(info->hdr); err = bytes; goto out; } if (bytes == 0) break; pos += bytes; } info->len = pos; |
40dd2560e
|
2594 |
|
34e1169d9
|
2595 |
out: |
a2e0578be
|
2596 |
fdput(f); |
40dd2560e
|
2597 2598 |
return err; } |
d913188c7
|
2599 2600 |
static void free_copy(struct load_info *info) { |
d913188c7
|
2601 2602 |
vfree(info->hdr); } |
2f3238aeb
|
2603 |
static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a79
|
2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 |
{ unsigned int i; /* This should always be true, but let's be sure. */ info->sechdrs[0].sh_addr = 0; for (i = 1; i < info->hdr->e_shnum; i++) { Elf_Shdr *shdr = &info->sechdrs[i]; if (shdr->sh_type != SHT_NOBITS && info->len < shdr->sh_offset + shdr->sh_size) { |
bddb12b32
|
2614 2615 |
pr_err("Module len %lu truncated ", info->len); |
8b5f61a79
|
2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 |
return -ENOEXEC; } /* Mark all sections sh_addr with their address in the temporary image. */ shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; #ifndef CONFIG_MODULE_UNLOAD /* Don't load .exit sections */ if (strstarts(info->secstrings+shdr->sh_name, ".exit")) shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; #endif |
8b5f61a79
|
2628 |
} |
d6df72a06
|
2629 2630 |
/* Track but don't keep modinfo and version sections. */ |
2f3238aeb
|
2631 2632 2633 2634 |
if (flags & MODULE_INIT_IGNORE_MODVERSIONS) info->index.vers = 0; /* Pretend no __versions section! */ else info->index.vers = find_sec(info, "__versions"); |
49668688d
|
2635 |
info->index.info = find_sec(info, ".modinfo"); |
d6df72a06
|
2636 2637 |
info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
8b5f61a79
|
2638 2639 |
return 0; } |
3264d3f9d
|
2640 2641 2642 2643 2644 2645 2646 2647 |
/* * Set up our basic convenience variables (pointers to section headers, * search for module section index etc), and do some basic section * verification. * * Return the temporary module pointer (we'll replace it with the final * one when we move the module sections around). */ |
2f3238aeb
|
2648 |
static struct module *setup_load_info(struct load_info *info, int flags) |
3264d3f9d
|
2649 2650 |
{ unsigned int i; |
8b5f61a79
|
2651 |
int err; |
3264d3f9d
|
2652 2653 2654 2655 |
struct module *mod; /* Set up the convenience variables */ info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; |
8b5f61a79
|
2656 2657 |
info->secstrings = (void *)info->hdr + info->sechdrs[info->hdr->e_shstrndx].sh_offset; |
3264d3f9d
|
2658 |
|
2f3238aeb
|
2659 |
err = rewrite_section_headers(info, flags); |
8b5f61a79
|
2660 2661 |
if (err) return ERR_PTR(err); |
3264d3f9d
|
2662 |
|
8b5f61a79
|
2663 2664 |
/* Find internal symbols and strings. */ for (i = 1; i < info->hdr->e_shnum; i++) { |
3264d3f9d
|
2665 2666 2667 |
if (info->sechdrs[i].sh_type == SHT_SYMTAB) { info->index.sym = i; info->index.str = info->sechdrs[i].sh_link; |
8b5f61a79
|
2668 2669 2670 |
info->strtab = (char *)info->hdr + info->sechdrs[info->index.str].sh_offset; break; |
3264d3f9d
|
2671 |
} |
3264d3f9d
|
2672 |
} |
49668688d
|
2673 |
info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9d
|
2674 |
if (!info->index.mod) { |
bddb12b32
|
2675 2676 |
pr_warn("No module found in object "); |
3264d3f9d
|
2677 2678 2679 2680 2681 2682 |
return ERR_PTR(-ENOEXEC); } /* This is temporary: point mod into copy of data. */ mod = (void *)info->sechdrs[info->index.mod].sh_addr; if (info->index.sym == 0) { |
bddb12b32
|
2683 2684 |
pr_warn("%s: module has no symbols (stripped?) ", mod->name); |
3264d3f9d
|
2685 2686 |
return ERR_PTR(-ENOEXEC); } |
49668688d
|
2687 |
info->index.pcpu = find_pcpusec(info); |
3264d3f9d
|
2688 |
|
3264d3f9d
|
2689 2690 2691 2692 2693 |
/* Check module struct version now, before we try to use module. */ if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) return ERR_PTR(-ENOEXEC); return mod; |
3264d3f9d
|
2694 |
} |
2f3238aeb
|
2695 |
static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560e
|
2696 |
{ |
49668688d
|
2697 |
const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560e
|
2698 |
int err; |
2f3238aeb
|
2699 2700 |
if (flags & MODULE_INIT_IGNORE_VERMAGIC) modmagic = NULL; |
40dd2560e
|
2701 2702 2703 2704 2705 |
/* This is allowed: modprobe --force will invalidate it. */ if (!modmagic) { err = try_to_force_load(mod, "bad vermagic"); if (err) return err; |
49668688d
|
2706 |
} else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
bddb12b32
|
2707 2708 |
pr_err("%s: version magic '%s' should be '%s' ", |
40dd2560e
|
2709 2710 2711 |
mod->name, modmagic, vermagic); return -ENOEXEC; } |
2449b8ba0
|
2712 |
if (!get_modinfo(info, "intree")) |
373d4d099
|
2713 |
add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
2449b8ba0
|
2714 |
|
49668688d
|
2715 |
if (get_modinfo(info, "staging")) { |
373d4d099
|
2716 |
add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
bddb12b32
|
2717 2718 2719 |
pr_warn("%s: module is from the staging directory, the quality " "is unknown, you have been warned. ", mod->name); |
40dd2560e
|
2720 |
} |
22e268ebe
|
2721 2722 |
/* Set up license info based on the info section */ |
49668688d
|
2723 |
set_license(mod, get_modinfo(info, "license")); |
22e268ebe
|
2724 |
|
40dd2560e
|
2725 2726 |
return 0; } |
eb3057df7
|
2727 |
static int find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb9
|
2728 |
{ |
49668688d
|
2729 |
mod->kp = section_objs(info, "__param", |
f91a13bb9
|
2730 |
sizeof(*mod->kp), &mod->num_kp); |
49668688d
|
2731 |
mod->syms = section_objs(info, "__ksymtab", |
f91a13bb9
|
2732 |
sizeof(*mod->syms), &mod->num_syms); |
49668688d
|
2733 2734 |
mod->crcs = section_addr(info, "__kcrctab"); mod->gpl_syms = section_objs(info, "__ksymtab_gpl", |
f91a13bb9
|
2735 2736 |
sizeof(*mod->gpl_syms), &mod->num_gpl_syms); |
49668688d
|
2737 2738 |
mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); mod->gpl_future_syms = section_objs(info, |
f91a13bb9
|
2739 2740 2741 |
"__ksymtab_gpl_future", sizeof(*mod->gpl_future_syms), &mod->num_gpl_future_syms); |
49668688d
|
2742 |
mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb9
|
2743 2744 |
#ifdef CONFIG_UNUSED_SYMBOLS |
49668688d
|
2745 |
mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb9
|
2746 2747 |
sizeof(*mod->unused_syms), &mod->num_unused_syms); |
49668688d
|
2748 2749 |
mod->unused_crcs = section_addr(info, "__kcrctab_unused"); mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", |
f91a13bb9
|
2750 2751 |
sizeof(*mod->unused_gpl_syms), &mod->num_unused_gpl_syms); |
49668688d
|
2752 |
mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb9
|
2753 2754 |
#endif #ifdef CONFIG_CONSTRUCTORS |
49668688d
|
2755 |
mod->ctors = section_objs(info, ".ctors", |
f91a13bb9
|
2756 |
sizeof(*mod->ctors), &mod->num_ctors); |
eb3057df7
|
2757 2758 2759 2760 2761 2762 2763 2764 |
if (!mod->ctors) mod->ctors = section_objs(info, ".init_array", sizeof(*mod->ctors), &mod->num_ctors); else if (find_sec(info, ".init_array")) { /* * This shouldn't happen with same compiler and binutils * building all parts of the module. */ |
6da0b5651
|
2765 2766 |
pr_warn("%s: has both .ctors and .init_array. ", |
eb3057df7
|
2767 2768 2769 |
mod->name); return -EINVAL; } |
f91a13bb9
|
2770 2771 2772 |
#endif #ifdef CONFIG_TRACEPOINTS |
654986462
|
2773 2774 2775 |
mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", sizeof(*mod->tracepoints_ptrs), &mod->num_tracepoints); |
f91a13bb9
|
2776 |
#endif |
bf5438fca
|
2777 2778 2779 2780 2781 |
#ifdef HAVE_JUMP_LABEL mod->jump_entries = section_objs(info, "__jump_table", sizeof(*mod->jump_entries), &mod->num_jump_entries); #endif |
f91a13bb9
|
2782 |
#ifdef CONFIG_EVENT_TRACING |
49668688d
|
2783 |
mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb9
|
2784 2785 |
sizeof(*mod->trace_events), &mod->num_trace_events); |
3673b8e4c
|
2786 2787 2788 |
mod->trace_enums = section_objs(info, "_ftrace_enum_map", sizeof(*mod->trace_enums), &mod->num_trace_enums); |
f91a13bb9
|
2789 |
#endif |
13b9b6e74
|
2790 2791 2792 2793 |
#ifdef CONFIG_TRACING mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", sizeof(*mod->trace_bprintk_fmt_start), &mod->num_trace_bprintk_fmt); |
13b9b6e74
|
2794 |
#endif |
f91a13bb9
|
2795 2796 |
#ifdef CONFIG_FTRACE_MCOUNT_RECORD /* sechdrs[0].sh_size is always zero */ |
49668688d
|
2797 |
mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb9
|
2798 2799 2800 |
sizeof(*mod->ftrace_callsites), &mod->num_ftrace_callsites); #endif |
22e268ebe
|
2801 |
|
811d66a0e
|
2802 2803 |
mod->extable = section_objs(info, "__ex_table", sizeof(*mod->extable), &mod->num_exentries); |
49668688d
|
2804 |
if (section_addr(info, "__obsparm")) |
bddb12b32
|
2805 2806 |
pr_warn("%s: Ignoring obsolete parameters ", mod->name); |
811d66a0e
|
2807 2808 2809 |
info->debug = section_objs(info, "__verbose", sizeof(*info->debug), &info->num_debug); |
eb3057df7
|
2810 2811 |
return 0; |
f91a13bb9
|
2812 |
} |
49668688d
|
2813 |
static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4d
|
2814 2815 2816 2817 2818 |
{ int i; void *ptr; /* Do the allocs. */ |
7523e4dc5
|
2819 |
ptr = module_alloc(mod->core_layout.size); |
65b8a9b4d
|
2820 2821 2822 2823 2824 2825 2826 |
/* * The pointer to this block is stored in the module structure * which is inside the block. Just mark it as not being a * leak. */ kmemleak_not_leak(ptr); if (!ptr) |
d913188c7
|
2827 |
return -ENOMEM; |
65b8a9b4d
|
2828 |
|
7523e4dc5
|
2829 2830 |
memset(ptr, 0, mod->core_layout.size); mod->core_layout.base = ptr; |
65b8a9b4d
|
2831 |
|
7523e4dc5
|
2832 2833 |
if (mod->init_layout.size) { ptr = module_alloc(mod->init_layout.size); |
82fab442f
|
2834 2835 2836 2837 2838 2839 2840 2841 |
/* * The pointer to this block is stored in the module structure * which is inside the block. This block doesn't need to be * scanned as it contains data and code that will be freed * after the module is initialized. */ kmemleak_ignore(ptr); if (!ptr) { |
7523e4dc5
|
2842 |
module_memfree(mod->core_layout.base); |
82fab442f
|
2843 2844 |
return -ENOMEM; } |
7523e4dc5
|
2845 2846 |
memset(ptr, 0, mod->init_layout.size); mod->init_layout.base = ptr; |
82fab442f
|
2847 |
} else |
7523e4dc5
|
2848 |
mod->init_layout.base = NULL; |
65b8a9b4d
|
2849 2850 |
/* Transfer each section which specifies SHF_ALLOC */ |
5e1241692
|
2851 2852 |
pr_debug("final section addresses: "); |
49668688d
|
2853 |
for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4d
|
2854 |
void *dest; |
49668688d
|
2855 |
Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4d
|
2856 |
|
49668688d
|
2857 |
if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4d
|
2858 |
continue; |
49668688d
|
2859 |
if (shdr->sh_entsize & INIT_OFFSET_MASK) |
7523e4dc5
|
2860 |
dest = mod->init_layout.base |
49668688d
|
2861 |
+ (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4d
|
2862 |
else |
7523e4dc5
|
2863 |
dest = mod->core_layout.base + shdr->sh_entsize; |
65b8a9b4d
|
2864 |
|
49668688d
|
2865 2866 |
if (shdr->sh_type != SHT_NOBITS) memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); |
65b8a9b4d
|
2867 |
/* Update sh_addr to point to copy in image. */ |
49668688d
|
2868 |
shdr->sh_addr = (unsigned long)dest; |
5e1241692
|
2869 2870 2871 |
pr_debug("\t0x%lx %s ", (long)shdr->sh_addr, info->secstrings + shdr->sh_name); |
65b8a9b4d
|
2872 |
} |
d913188c7
|
2873 2874 |
return 0; |
65b8a9b4d
|
2875 |
} |
49668688d
|
2876 |
static int check_module_license_and_versions(struct module *mod) |
22e268ebe
|
2877 2878 2879 2880 2881 2882 2883 |
{ /* * 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) |
373d4d099
|
2884 |
add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268ebe
|
2885 2886 2887 |
/* driverloader was caught wrongly pretending to be under GPL */ if (strcmp(mod->name, "driverloader") == 0) |
373d4d099
|
2888 2889 |
add_taint_module(mod, TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
22e268ebe
|
2890 |
|
c99af3752
|
2891 2892 |
/* lve claims to be GPL but upstream won't provide source */ if (strcmp(mod->name, "lve") == 0) |
373d4d099
|
2893 2894 |
add_taint_module(mod, TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
c99af3752
|
2895 |
|
22e268ebe
|
2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 |
#ifdef CONFIG_MODVERSIONS if ((mod->num_syms && !mod->crcs) || (mod->num_gpl_syms && !mod->gpl_crcs) || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) #ifdef CONFIG_UNUSED_SYMBOLS || (mod->num_unused_syms && !mod->unused_crcs) || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) #endif ) { return try_to_force_load(mod, "no versions for exported symbols"); } #endif return 0; } static void flush_module_icache(const struct module *mod) { mm_segment_t old_fs; /* flush the icache in correct context */ old_fs = get_fs(); set_fs(KERNEL_DS); /* * Flush the instruction cache, since we've played with text. * Do it before processing of module parameters, so the module * can provide parameter accessor functions of its own. */ |
7523e4dc5
|
2925 2926 2927 2928 2929 2930 |
if (mod->init_layout.base) flush_icache_range((unsigned long)mod->init_layout.base, (unsigned long)mod->init_layout.base + mod->init_layout.size); flush_icache_range((unsigned long)mod->core_layout.base, (unsigned long)mod->core_layout.base + mod->core_layout.size); |
22e268ebe
|
2931 2932 2933 |
set_fs(old_fs); } |
74e08fcf7
|
2934 2935 2936 2937 2938 2939 2940 |
int __weak module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, char *secstrings, struct module *mod) { return 0; } |
2f3238aeb
|
2941 |
static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4c
|
2942 |
{ |
d913188c7
|
2943 |
/* Module within temporary copy. */ |
1da177e4c
|
2944 |
struct module *mod; |
d913188c7
|
2945 |
int err; |
3ae91c21d
|
2946 |
|
2f3238aeb
|
2947 |
mod = setup_load_info(info, flags); |
d913188c7
|
2948 2949 |
if (IS_ERR(mod)) return mod; |
1da177e4c
|
2950 |
|
2f3238aeb
|
2951 |
err = check_modinfo(mod, info, flags); |
40dd2560e
|
2952 2953 |
if (err) return ERR_PTR(err); |
1da177e4c
|
2954 |
|
1da177e4c
|
2955 |
/* Allow arches to frob section contents and sizes. */ |
49668688d
|
2956 2957 |
err = module_frob_arch_sections(info->hdr, info->sechdrs, info->secstrings, mod); |
1da177e4c
|
2958 |
if (err < 0) |
8d8022e8a
|
2959 |
return ERR_PTR(err); |
1da177e4c
|
2960 |
|
8d8022e8a
|
2961 2962 |
/* We will do a special allocation for per-cpu sections later. */ info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4c
|
2963 2964 2965 2966 |
/* Determine total sizes, and put offsets in sh_entsize. For now this is done generically; there doesn't appear to be any special cases for the architectures. */ |
49668688d
|
2967 |
layout_sections(mod, info); |
49668688d
|
2968 |
layout_symtab(mod, info); |
1da177e4c
|
2969 |
|
65b8a9b4d
|
2970 |
/* Allocate and move to the final place */ |
49668688d
|
2971 |
err = move_module(mod, info); |
d913188c7
|
2972 |
if (err) |
8d8022e8a
|
2973 |
return ERR_PTR(err); |
d913188c7
|
2974 2975 2976 |
/* Module has been copied to its final place now: return it. */ mod = (void *)info->sechdrs[info->index.mod].sh_addr; |
49668688d
|
2977 |
kmemleak_load_module(mod, info); |
d913188c7
|
2978 |
return mod; |
d913188c7
|
2979 2980 2981 2982 2983 |
} /* mod is no longer valid after this! */ static void module_deallocate(struct module *mod, struct load_info *info) { |
d913188c7
|
2984 |
percpu_modfree(mod); |
d453cded0
|
2985 |
module_arch_freeing_init(mod); |
7523e4dc5
|
2986 2987 |
module_memfree(mod->init_layout.base); module_memfree(mod->core_layout.base); |
d913188c7
|
2988 |
} |
74e08fcf7
|
2989 2990 2991 2992 2993 2994 |
int __weak module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *me) { return 0; } |
811d66a0e
|
2995 2996 |
static int post_relocation(struct module *mod, const struct load_info *info) { |
51f3d0f47
|
2997 |
/* Sort exception table now relocations are done. */ |
811d66a0e
|
2998 2999 3000 3001 3002 |
sort_extable(mod->extable, mod->extable + mod->num_exentries); /* Copy relocated percpu area over. */ percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, info->sechdrs[info->index.pcpu].sh_size); |
51f3d0f47
|
3003 |
/* Setup kallsyms-specific fields. */ |
811d66a0e
|
3004 3005 3006 3007 3008 |
add_kallsyms(mod, info); /* Arch-specific module finalizing. */ return module_finalize(info->hdr, info->sechdrs, mod); } |
9bb9c3be5
|
3009 3010 3011 3012 3013 |
/* Is this module of this name done loading? No locks held. */ static bool finished_loading(const char *name) { struct module *mod; bool ret; |
9cc019b8c
|
3014 3015 3016 3017 3018 3019 |
/* * The module_mutex should not be a heavily contended lock; * if we get the occasional sleep here, we'll go an extra iteration * in the wait_event_interruptible(), which is harmless. */ sched_annotate_sleep(); |
9bb9c3be5
|
3020 |
mutex_lock(&module_mutex); |
4f6de4d51
|
3021 |
mod = find_module_all(name, strlen(name), true); |
0d21b0e34
|
3022 3023 |
ret = !mod || mod->state == MODULE_STATE_LIVE || mod->state == MODULE_STATE_GOING; |
9bb9c3be5
|
3024 3025 3026 3027 |
mutex_unlock(&module_mutex); return ret; } |
34e1169d9
|
3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 |
/* Call module constructors. */ static void do_mod_ctors(struct module *mod) { #ifdef CONFIG_CONSTRUCTORS unsigned long i; for (i = 0; i < mod->num_ctors; i++) mod->ctors[i](); #endif } |
c74963790
|
3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 |
/* For freeing module_init on success, in case kallsyms traversing */ struct mod_initfree { struct rcu_head rcu; void *module_init; }; static void do_free_init(struct rcu_head *head) { struct mod_initfree *m = container_of(head, struct mod_initfree, rcu); module_memfree(m->module_init); kfree(m); } |
be02a1862
|
3050 3051 3052 3053 3054 3055 3056 |
/* * This is where the real work happens. * * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb * helper command 'lx-symbols'. */ static noinline int do_init_module(struct module *mod) |
34e1169d9
|
3057 3058 |
{ int ret = 0; |
c74963790
|
3059 3060 3061 3062 3063 3064 3065 |
struct mod_initfree *freeinit; freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); if (!freeinit) { ret = -ENOMEM; goto fail; } |
7523e4dc5
|
3066 |
freeinit->module_init = mod->init_layout.base; |
34e1169d9
|
3067 |
|
774a1221e
|
3068 3069 3070 3071 3072 |
/* * We want to find out whether @mod uses async during init. Clear * PF_USED_ASYNC. async_schedule*() will set it. */ current->flags &= ~PF_USED_ASYNC; |
34e1169d9
|
3073 3074 3075 3076 3077 |
do_mod_ctors(mod); /* Start the module */ if (mod->init != NULL) ret = do_one_initcall(mod->init); if (ret < 0) { |
c74963790
|
3078 |
goto fail_free_freeinit; |
34e1169d9
|
3079 3080 |
} if (ret > 0) { |
bddb12b32
|
3081 3082 3083 3084 3085 3086 |
pr_warn("%s: '%s'->init suspiciously returned %d, it should " "follow 0/-E convention " "%s: loading module anyway... ", __func__, mod->name, ret, __func__); |
34e1169d9
|
3087 3088 3089 3090 3091 3092 3093 |
dump_stack(); } /* Now it's a first class citizen! */ mod->state = MODULE_STATE_LIVE; blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_LIVE, mod); |
774a1221e
|
3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 |
/* * We need to finish all async code before the module init sequence * is done. This has potential to deadlock. For example, a newly * detected block device can trigger request_module() of the * default iosched from async probing task. Once userland helper * reaches here, async_synchronize_full() will wait on the async * task waiting on request_module() and deadlock. * * This deadlock is avoided by perfomring async_synchronize_full() * iff module init queued any async jobs. This isn't a full * solution as it will deadlock the same if module loading from * async jobs nests more than once; however, due to the various * constraints, this hack seems to be the best option for now. * Please refer to the following thread for details. * * http://thread.gmane.org/gmane.linux.kernel/1420814 */ |
f2411da74
|
3111 |
if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
774a1221e
|
3112 |
async_synchronize_full(); |
34e1169d9
|
3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 |
mutex_lock(&module_mutex); /* Drop initial reference. */ module_put(mod); trim_init_extable(mod); #ifdef CONFIG_KALLSYMS mod->num_symtab = mod->core_num_syms; mod->symtab = mod->core_symtab; mod->strtab = mod->core_strtab; #endif |
93c2e105f
|
3123 |
mod_tree_remove_init(mod); |
85c898db6
|
3124 |
disable_ro_nx(&mod->init_layout); |
d453cded0
|
3125 |
module_arch_freeing_init(mod); |
7523e4dc5
|
3126 3127 3128 3129 |
mod->init_layout.base = NULL; mod->init_layout.size = 0; mod->init_layout.ro_size = 0; mod->init_layout.text_size = 0; |
c74963790
|
3130 3131 |
/* * We want to free module_init, but be aware that kallsyms may be |
0be964be0
|
3132 3133 3134 |
* walking this with preempt disabled. In all the failure paths, we * call synchronize_sched(), but we don't want to slow down the success * path, so use actual RCU here. |
c74963790
|
3135 |
*/ |
0be964be0
|
3136 |
call_rcu_sched(&freeinit->rcu, do_free_init); |
34e1169d9
|
3137 3138 3139 3140 |
mutex_unlock(&module_mutex); wake_up_all(&module_wq); return 0; |
c74963790
|
3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 |
fail_free_freeinit: kfree(freeinit); fail: /* 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); free_module(mod); wake_up_all(&module_wq); return ret; |
34e1169d9
|
3154 3155 3156 3157 3158 3159 3160 3161 3162 |
} static int may_init_module(void) { if (!capable(CAP_SYS_MODULE) || modules_disabled) return -EPERM; return 0; } |
a3535c7e4
|
3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 |
/* * We try to place it in the list now to make sure it's unique before * we dedicate too many resources. In particular, temporary percpu * memory exhaustion. */ static int add_unformed_module(struct module *mod) { int err; struct module *old; mod->state = MODULE_STATE_UNFORMED; again: mutex_lock(&module_mutex); |
4f6de4d51
|
3177 3178 |
old = find_module_all(mod->name, strlen(mod->name), true); if (old != NULL) { |
a3535c7e4
|
3179 3180 3181 3182 |
if (old->state == MODULE_STATE_COMING || old->state == MODULE_STATE_UNFORMED) { /* Wait in case it fails to load. */ mutex_unlock(&module_mutex); |
9cc019b8c
|
3183 3184 |
err = wait_event_interruptible(module_wq, finished_loading(mod->name)); |
a3535c7e4
|
3185 3186 3187 3188 3189 3190 3191 |
if (err) goto out_unlocked; goto again; } err = -EEXIST; goto out; } |
4f666546d
|
3192 |
mod_update_bounds(mod); |
a3535c7e4
|
3193 |
list_add_rcu(&mod->list, &modules); |
93c2e105f
|
3194 |
mod_tree_insert(mod); |
a3535c7e4
|
3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 |
err = 0; out: mutex_unlock(&module_mutex); out_unlocked: return err; } static int complete_formation(struct module *mod, struct load_info *info) { int err; mutex_lock(&module_mutex); /* Find duplicate symbols (must be called under lock). */ err = verify_export_symbols(mod); if (err < 0) goto out; /* This relies on module_mutex for list integrity. */ module_bug_finalize(info->hdr, info->sechdrs, mod); |
20ef10c1b
|
3216 |
/* Set RO and NX regions */ |
85c898db6
|
3217 3218 |
module_enable_ro(mod); module_enable_nx(mod); |
4982223e5
|
3219 |
|
a3535c7e4
|
3220 3221 3222 |
/* Mark state as coming so strong_try_module_get() ignores us, * but kallsyms etc. can see us. */ mod->state = MODULE_STATE_COMING; |
4982223e5
|
3223 3224 3225 3226 3227 |
mutex_unlock(&module_mutex); blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_COMING, mod); return 0; |
a3535c7e4
|
3228 3229 3230 3231 3232 |
out: mutex_unlock(&module_mutex); return err; } |
ecc861705
|
3233 3234 |
static int unknown_module_param_cb(char *param, char *val, const char *modname, void *arg) |
54041d8a7
|
3235 |
{ |
f2411da74
|
3236 3237 3238 3239 3240 3241 3242 |
struct module *mod = arg; int ret; if (strcmp(param, "async_probe") == 0) { mod->async_probe_requested = true; return 0; } |
6da0b5651
|
3243 |
/* Check for magic 'dyndbg' arg */ |
f2411da74
|
3244 |
ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
bddb12b32
|
3245 3246 3247 |
if (ret != 0) pr_warn("%s: unknown parameter '%s' ignored ", modname, param); |
54041d8a7
|
3248 3249 |
return 0; } |
d913188c7
|
3250 3251 |
/* Allocate and load the module: note that size of section 0 is always zero, and we rely on this for optional sections. */ |
2f3238aeb
|
3252 3253 |
static int load_module(struct load_info *info, const char __user *uargs, int flags) |
d913188c7
|
3254 |
{ |
a3535c7e4
|
3255 |
struct module *mod; |
d913188c7
|
3256 |
long err; |
51e158c12
|
3257 |
char *after_dashes; |
d913188c7
|
3258 |
|
34e1169d9
|
3259 3260 3261 |
err = module_sig_check(info); if (err) goto free_copy; |
d913188c7
|
3262 |
|
34e1169d9
|
3263 |
err = elf_header_check(info); |
d913188c7
|
3264 |
if (err) |
34e1169d9
|
3265 |
goto free_copy; |
d913188c7
|
3266 3267 |
/* Figure out module layout, and allocate all the memory. */ |
2f3238aeb
|
3268 |
mod = layout_and_allocate(info, flags); |
65b8a9b4d
|
3269 3270 |
if (IS_ERR(mod)) { err = PTR_ERR(mod); |
d913188c7
|
3271 |
goto free_copy; |
1da177e4c
|
3272 |
} |
1da177e4c
|
3273 |
|
a3535c7e4
|
3274 3275 3276 |
/* Reserve our place in the list. */ err = add_unformed_module(mod); if (err) |
1fb9341ac
|
3277 |
goto free_module; |
1fb9341ac
|
3278 |
|
106a4ee25
|
3279 |
#ifdef CONFIG_MODULE_SIG |
34e1169d9
|
3280 |
mod->sig_ok = info->sig_ok; |
64748a2c9
|
3281 |
if (!mod->sig_ok) { |
bddb12b32
|
3282 |
pr_notice_once("%s: module verification failed: signature " |
ab92ebbb8
|
3283 |
"and/or required key missing - tainting " |
bddb12b32
|
3284 3285 |
"kernel ", mod->name); |
66cc69e34
|
3286 |
add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
64748a2c9
|
3287 |
} |
106a4ee25
|
3288 |
#endif |
8d8022e8a
|
3289 |
/* To avoid stressing percpu allocator, do this once we're unique. */ |
9eb76d779
|
3290 |
err = percpu_modalloc(mod, info); |
8d8022e8a
|
3291 3292 |
if (err) goto unlink_mod; |
49668688d
|
3293 |
/* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bbb
|
3294 3295 |
err = module_unload_init(mod); if (err) |
1fb9341ac
|
3296 |
goto unlink_mod; |
1da177e4c
|
3297 |
|
cf2fde7b3
|
3298 |
init_param_lock(mod); |
b51d23e4e
|
3299 |
|
22e268ebe
|
3300 3301 |
/* Now we've got everything in the final locations, we can * find optional sections. */ |
eb3057df7
|
3302 3303 3304 |
err = find_module_sections(mod, info); if (err) goto free_unload; |
9b37ccfc6
|
3305 |
|
49668688d
|
3306 |
err = check_module_license_and_versions(mod); |
22e268ebe
|
3307 3308 |
if (err) goto free_unload; |
9841d61d7
|
3309 |
|
c988d2b28
|
3310 |
/* Set up MODINFO_ATTR fields */ |
34e1169d9
|
3311 |
setup_modinfo(mod, info); |
c988d2b28
|
3312 |
|
1da177e4c
|
3313 |
/* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d9
|
3314 |
err = simplify_symbols(mod, info); |
1da177e4c
|
3315 |
if (err < 0) |
d913188c7
|
3316 |
goto free_modinfo; |
1da177e4c
|
3317 |
|
34e1169d9
|
3318 |
err = apply_relocations(mod, info); |
22e268ebe
|
3319 |
if (err < 0) |
d913188c7
|
3320 |
goto free_modinfo; |
1da177e4c
|
3321 |
|
34e1169d9
|
3322 |
err = post_relocation(mod, info); |
1da177e4c
|
3323 |
if (err < 0) |
d913188c7
|
3324 |
goto free_modinfo; |
1da177e4c
|
3325 |
|
22e268ebe
|
3326 |
flush_module_icache(mod); |
378bac820
|
3327 |
|
6526c534b
|
3328 3329 3330 3331 3332 3333 |
/* Now copy in args */ mod->args = strndup_user(uargs, ~0UL >> 1); if (IS_ERR(mod->args)) { err = PTR_ERR(mod->args); goto free_arch_cleanup; } |
8d3b33f67
|
3334 |
|
34e1169d9
|
3335 |
dynamic_debug_setup(info->debug, info->num_debug); |
ff49d74ad
|
3336 |
|
a949ae560
|
3337 3338 |
/* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ ftrace_module_init(mod); |
a3535c7e4
|
3339 3340 3341 |
/* Finally it's fully formed, ready to start executing. */ err = complete_formation(mod, info); if (err) |
1fb9341ac
|
3342 |
goto ddebug_cleanup; |
be593f4ce
|
3343 |
|
51f3d0f47
|
3344 |
/* Module is ready to execute: parsing args may do that. */ |
51e158c12
|
3345 |
after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
ecc861705
|
3346 3347 |
-32768, 32767, NULL, unknown_module_param_cb); |
51e158c12
|
3348 3349 |
if (IS_ERR(after_dashes)) { err = PTR_ERR(after_dashes); |
1fb9341ac
|
3350 |
goto bug_cleanup; |
51e158c12
|
3351 3352 3353 3354 3355 |
} else if (after_dashes) { pr_warn("%s: parameters '%s' after `--' ignored ", mod->name, after_dashes); } |
1da177e4c
|
3356 |
|
51f3d0f47
|
3357 |
/* Link in to syfs. */ |
34e1169d9
|
3358 |
err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4c
|
3359 |
if (err < 0) |
1fb9341ac
|
3360 |
goto bug_cleanup; |
80a3d1bb4
|
3361 |
|
48fd11880
|
3362 |
/* Get rid of temporary copy. */ |
34e1169d9
|
3363 |
free_copy(info); |
1da177e4c
|
3364 3365 |
/* Done! */ |
51f3d0f47
|
3366 |
trace_module_load(mod); |
34e1169d9
|
3367 3368 |
return do_init_module(mod); |
1da177e4c
|
3369 |
|
1fb9341ac
|
3370 3371 |
bug_cleanup: /* module_bug_cleanup needs module_mutex protection */ |
75676500f
|
3372 |
mutex_lock(&module_mutex); |
5336377d6
|
3373 |
module_bug_cleanup(mod); |
ee61abb32
|
3374 |
mutex_unlock(&module_mutex); |
ff7e0055b
|
3375 |
|
37815bf86
|
3376 3377 |
blocking_notifier_call_chain(&module_notify_list, MODULE_STATE_GOING, mod); |
ff7e0055b
|
3378 |
/* we can't deallocate the module until we clear memory protection */ |
85c898db6
|
3379 3380 |
module_disable_ro(mod); module_disable_nx(mod); |
ff7e0055b
|
3381 |
|
a3535c7e4
|
3382 |
ddebug_cleanup: |
1fb9341ac
|
3383 |
dynamic_debug_remove(info->debug); |
e91defa26
|
3384 |
synchronize_sched(); |
6526c534b
|
3385 3386 |
kfree(mod->args); free_arch_cleanup: |
1da177e4c
|
3387 |
module_arch_cleanup(mod); |
d913188c7
|
3388 |
free_modinfo: |
a263f7763
|
3389 |
free_modinfo(mod); |
22e268ebe
|
3390 |
free_unload: |
1da177e4c
|
3391 |
module_unload_free(mod); |
1fb9341ac
|
3392 3393 3394 3395 |
unlink_mod: mutex_lock(&module_mutex); /* Unlink carefully: kallsyms could be walking list. */ list_del_rcu(&mod->list); |
758556bdc
|
3396 |
mod_tree_remove(mod); |
1fb9341ac
|
3397 |
wake_up_all(&module_wq); |
0be964be0
|
3398 3399 |
/* Wait for RCU-sched synchronizing before releasing mod->list. */ synchronize_sched(); |
1fb9341ac
|
3400 |
mutex_unlock(&module_mutex); |
d913188c7
|
3401 |
free_module: |
049fb9bd4
|
3402 3403 3404 3405 3406 3407 |
/* * Ftrace needs to clean up what it initialized. * This does nothing if ftrace_module_init() wasn't called, * but it must be called outside of module_mutex. */ ftrace_release_mod(mod); |
35a9393c9
|
3408 |
/* Free lock-classes; relies on the preceding sync_rcu() */ |
7523e4dc5
|
3409 |
lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
35a9393c9
|
3410 |
|
34e1169d9
|
3411 |
module_deallocate(mod, info); |
d913188c7
|
3412 |
free_copy: |
34e1169d9
|
3413 3414 |
free_copy(info); return err; |
b99b87f70
|
3415 |
} |
17da2bd90
|
3416 3417 |
SYSCALL_DEFINE3(init_module, void __user *, umod, unsigned long, len, const char __user *, uargs) |
1da177e4c
|
3418 |
{ |
34e1169d9
|
3419 3420 |
int err; struct load_info info = { }; |
1da177e4c
|
3421 |
|
34e1169d9
|
3422 3423 3424 |
err = may_init_module(); if (err) return err; |
1da177e4c
|
3425 |
|
34e1169d9
|
3426 3427 3428 |
pr_debug("init_module: umod=%p, len=%lu, uargs=%p ", umod, len, uargs); |
1da177e4c
|
3429 |
|
34e1169d9
|
3430 3431 3432 |
err = copy_module_from_user(umod, len, &info); if (err) return err; |
1da177e4c
|
3433 |
|
2f3238aeb
|
3434 |
return load_module(&info, uargs, 0); |
34e1169d9
|
3435 |
} |
94462ad3b
|
3436 |
|
2f3238aeb
|
3437 |
SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d9
|
3438 3439 3440 |
{ int err; struct load_info info = { }; |
94462ad3b
|
3441 |
|
34e1169d9
|
3442 3443 3444 |
err = may_init_module(); if (err) return err; |
1da177e4c
|
3445 |
|
2f3238aeb
|
3446 3447 |
pr_debug("finit_module: fd=%d, uargs=%p, flags=%i ", fd, uargs, flags); |
6c5db22d2
|
3448 |
|
2f3238aeb
|
3449 3450 3451 |
if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |MODULE_INIT_IGNORE_VERMAGIC)) return -EINVAL; |
d6de2c80e
|
3452 |
|
34e1169d9
|
3453 3454 3455 |
err = copy_module_from_fd(fd, &info); if (err) return err; |
1da177e4c
|
3456 |
|
2f3238aeb
|
3457 |
return load_module(&info, uargs, flags); |
1da177e4c
|
3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 |
} 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 $d. */ static inline int is_arm_mapping_symbol(const char *str) { |
2e3a10a15
|
3472 3473 |
if (str[0] == '.' && str[1] == 'L') return true; |
6c34f1f54
|
3474 |
return str[0] == '$' && strchr("axtd", str[1]) |
1da177e4c
|
3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 |
&& (str[2] == '\0' || str[2] == '.'); } static const char *get_ksymbol(struct module *mod, unsigned long addr, unsigned long *size, unsigned long *offset) { unsigned int i, best = 0; unsigned long nextval; /* At worse, next value is at end of module */ |
a06f6211e
|
3487 |
if (within_module_init(addr, mod)) |
7523e4dc5
|
3488 |
nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
22a8bdeb5
|
3489 |
else |
7523e4dc5
|
3490 |
nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
1da177e4c
|
3491 |
|
25985edce
|
3492 |
/* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb5
|
3493 |
starts real symbols at 1). */ |
1da177e4c
|
3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 |
for (i = 1; i < mod->num_symtab; i++) { if (mod->symtab[i].st_shndx == SHN_UNDEF) continue; /* We ignore unnamed symbols: they're uninformative * and inserted at a whim. */ if (mod->symtab[i].st_value <= addr && mod->symtab[i].st_value > mod->symtab[best].st_value && *(mod->strtab + mod->symtab[i].st_name) != '\0' && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) best = i; if (mod->symtab[i].st_value > addr && mod->symtab[i].st_value < nextval && *(mod->strtab + mod->symtab[i].st_name) != '\0' && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) nextval = mod->symtab[i].st_value; } if (!best) return NULL; |
ffb451227
|
3514 3515 3516 3517 |
if (size) *size = nextval - mod->symtab[best].st_value; if (offset) *offset = addr - mod->symtab[best].st_value; |
1da177e4c
|
3518 3519 |
return mod->strtab + mod->symtab[best].st_name; } |
6dd06c9fb
|
3520 3521 |
/* For kallsyms to ask for address resolution. NULL means not found. Careful * not to lock to avoid deadlock on oopses, simply disable preemption. */ |
92dfc9dc7
|
3522 |
const char *module_address_lookup(unsigned long addr, |
6dd06c9fb
|
3523 3524 3525 3526 |
unsigned long *size, unsigned long *offset, char **modname, char *namebuf) |
1da177e4c
|
3527 |
{ |
cb2a52052
|
3528 |
const char *ret = NULL; |
b7df4d1b2
|
3529 |
struct module *mod; |
1da177e4c
|
3530 |
|
cb2a52052
|
3531 |
preempt_disable(); |
b7df4d1b2
|
3532 3533 3534 3535 3536 |
mod = __module_address(addr); if (mod) { if (modname) *modname = mod->name; ret = get_ksymbol(mod, addr, size, offset); |
1da177e4c
|
3537 |
} |
6dd06c9fb
|
3538 3539 3540 3541 3542 |
/* Make a copy in here where it's safe */ if (ret) { strncpy(namebuf, ret, KSYM_NAME_LEN - 1); ret = namebuf; } |
cb2a52052
|
3543 |
preempt_enable(); |
b7df4d1b2
|
3544 |
|
92dfc9dc7
|
3545 |
return ret; |
1da177e4c
|
3546 |
} |
9d65cb4a1
|
3547 3548 3549 |
int lookup_module_symbol_name(unsigned long addr, char *symname) { struct module *mod; |
cb2a52052
|
3550 |
preempt_disable(); |
d72b37513
|
3551 |
list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e34
|
3552 3553 |
if (mod->state == MODULE_STATE_UNFORMED) continue; |
9b20a352d
|
3554 |
if (within_module(addr, mod)) { |
9d65cb4a1
|
3555 3556 3557 3558 3559 |
const char *sym; sym = get_ksymbol(mod, addr, NULL, NULL); if (!sym) goto out; |
9281acea6
|
3560 |
strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a52052
|
3561 |
preempt_enable(); |
9d65cb4a1
|
3562 3563 3564 3565 |
return 0; } } out: |
cb2a52052
|
3566 |
preempt_enable(); |
9d65cb4a1
|
3567 3568 |
return -ERANGE; } |
a5c43dae7
|
3569 3570 3571 3572 |
int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) { struct module *mod; |
cb2a52052
|
3573 |
preempt_disable(); |
d72b37513
|
3574 |
list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e34
|
3575 3576 |
if (mod->state == MODULE_STATE_UNFORMED) continue; |
9b20a352d
|
3577 |
if (within_module(addr, mod)) { |
a5c43dae7
|
3578 3579 3580 3581 3582 3583 |
const char *sym; sym = get_ksymbol(mod, addr, size, offset); if (!sym) goto out; if (modname) |
9281acea6
|
3584 |
strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae7
|
3585 |
if (name) |
9281acea6
|
3586 |
strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a52052
|
3587 |
preempt_enable(); |
a5c43dae7
|
3588 3589 3590 3591 |
return 0; } } out: |
cb2a52052
|
3592 |
preempt_enable(); |
a5c43dae7
|
3593 3594 |
return -ERANGE; } |
ea07890a6
|
3595 3596 |
int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, char *name, char *module_name, int *exported) |
1da177e4c
|
3597 3598 |
{ struct module *mod; |
cb2a52052
|
3599 |
preempt_disable(); |
d72b37513
|
3600 |
list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e34
|
3601 3602 |
if (mod->state == MODULE_STATE_UNFORMED) continue; |
1da177e4c
|
3603 3604 3605 |
if (symnum < mod->num_symtab) { *value = mod->symtab[symnum].st_value; *type = mod->symtab[symnum].st_info; |
098c5eea0
|
3606 |
strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea6
|
3607 3608 |
KSYM_NAME_LEN); strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
ca4787b77
|
3609 |
*exported = is_exported(name, *value, mod); |
cb2a52052
|
3610 |
preempt_enable(); |
ea07890a6
|
3611 |
return 0; |
1da177e4c
|
3612 3613 3614 |
} symnum -= mod->num_symtab; } |
cb2a52052
|
3615 |
preempt_enable(); |
ea07890a6
|
3616 |
return -ERANGE; |
1da177e4c
|
3617 3618 3619 3620 3621 3622 3623 |
} static unsigned long mod_find_symname(struct module *mod, const char *name) { unsigned int i; for (i = 0; i < mod->num_symtab; i++) |
54e8ce463
|
3624 3625 |
if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && mod->symtab[i].st_info != 'U') |
1da177e4c
|
3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 |
return mod->symtab[i].st_value; return 0; } /* Look for this name: can be of form module:name. */ unsigned long module_kallsyms_lookup_name(const char *name) { struct module *mod; char *colon; unsigned long ret = 0; /* Don't lock: we're in enough trouble already. */ |
cb2a52052
|
3638 |
preempt_disable(); |
1da177e4c
|
3639 |
if ((colon = strchr(name, ':')) != NULL) { |
4f6de4d51
|
3640 |
if ((mod = find_module_all(name, colon - name, false)) != NULL) |
1da177e4c
|
3641 |
ret = mod_find_symname(mod, colon+1); |
1da177e4c
|
3642 |
} else { |
0d21b0e34
|
3643 3644 3645 |
list_for_each_entry_rcu(mod, &modules, list) { if (mod->state == MODULE_STATE_UNFORMED) continue; |
1da177e4c
|
3646 3647 |
if ((ret = mod_find_symname(mod, name)) != 0) break; |
0d21b0e34
|
3648 |
} |
1da177e4c
|
3649 |
} |
cb2a52052
|
3650 |
preempt_enable(); |
1da177e4c
|
3651 3652 |
return ret; } |
75a66614d
|
3653 3654 3655 3656 3657 3658 3659 3660 |
int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, unsigned long), void *data) { struct module *mod; unsigned int i; int ret; |
0be964be0
|
3661 |
module_assert_mutex(); |
75a66614d
|
3662 |
list_for_each_entry(mod, &modules, list) { |
0d21b0e34
|
3663 3664 |
if (mod->state == MODULE_STATE_UNFORMED) continue; |
75a66614d
|
3665 3666 3667 3668 3669 3670 3671 3672 3673 |
for (i = 0; i < mod->num_symtab; i++) { ret = fn(data, mod->strtab + mod->symtab[i].st_name, mod, mod->symtab[i].st_value); if (ret != 0) return ret; } } return 0; } |
1da177e4c
|
3674 |
#endif /* CONFIG_KALLSYMS */ |
21aa9280b
|
3675 |
static char *module_flags(struct module *mod, char *buf) |
fa3ba2e81
|
3676 3677 |
{ int bx = 0; |
0d21b0e34
|
3678 |
BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280b
|
3679 3680 3681 |
if (mod->taints || mod->state == MODULE_STATE_GOING || mod->state == MODULE_STATE_COMING) { |
fa3ba2e81
|
3682 |
buf[bx++] = '('; |
cca3e7073
|
3683 |
bx += module_flags_taint(mod, buf + bx); |
21aa9280b
|
3684 3685 3686 3687 3688 3689 |
/* Show a - for module-is-being-unloaded */ if (mod->state == MODULE_STATE_GOING) buf[bx++] = '-'; /* Show a + for module-is-being-loaded */ if (mod->state == MODULE_STATE_COMING) buf[bx++] = '+'; |
fa3ba2e81
|
3690 3691 3692 3693 3694 3695 |
buf[bx++] = ')'; } buf[bx] = '\0'; return buf; } |
3b5d5c6b0
|
3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 |
#ifdef CONFIG_PROC_FS /* Called by the /proc file system to return a list of modules. */ static void *m_start(struct seq_file *m, loff_t *pos) { mutex_lock(&module_mutex); return seq_list_start(&modules, *pos); } static void *m_next(struct seq_file *m, void *p, loff_t *pos) { return seq_list_next(p, &modules, pos); } static void m_stop(struct seq_file *m, void *p) { mutex_unlock(&module_mutex); } |
1da177e4c
|
3713 3714 3715 |
static int m_show(struct seq_file *m, void *p) { struct module *mod = list_entry(p, struct module, list); |
fa3ba2e81
|
3716 |
char buf[8]; |
0d21b0e34
|
3717 3718 3719 |
/* We always ignore unformed modules. */ if (mod->state == MODULE_STATE_UNFORMED) return 0; |
2f0f2a334
|
3720 |
seq_printf(m, "%s %u", |
7523e4dc5
|
3721 |
mod->name, mod->init_layout.size + mod->core_layout.size); |
1da177e4c
|
3722 3723 3724 3725 |
print_unload_info(m, mod); /* Informative for users. */ seq_printf(m, " %s", |
6da0b5651
|
3726 3727 |
mod->state == MODULE_STATE_GOING ? "Unloading" : mod->state == MODULE_STATE_COMING ? "Loading" : |
1da177e4c
|
3728 3729 |
"Live"); /* Used by oprofile and other similar tools. */ |
7523e4dc5
|
3730 |
seq_printf(m, " 0x%pK", mod->core_layout.base); |
1da177e4c
|
3731 |
|
fa3ba2e81
|
3732 3733 |
/* Taints info */ if (mod->taints) |
21aa9280b
|
3734 |
seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e81
|
3735 |
|
6da0b5651
|
3736 3737 |
seq_puts(m, " "); |
1da177e4c
|
3738 3739 3740 3741 3742 3743 3744 3745 |
return 0; } /* Format: modulename size refcount deps address Where refcount is a number or -, and deps is a comma-separated list of depends or -. */ |
3b5d5c6b0
|
3746 |
static const struct seq_operations modules_op = { |
1da177e4c
|
3747 3748 3749 3750 3751 |
.start = m_start, .next = m_next, .stop = m_stop, .show = m_show }; |
3b5d5c6b0
|
3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 |
static int modules_open(struct inode *inode, struct file *file) { return seq_open(file, &modules_op); } static const struct file_operations proc_modules_operations = { .open = modules_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; static int __init proc_modules_init(void) { proc_create("modules", 0, NULL, &proc_modules_operations); return 0; } module_init(proc_modules_init); #endif |
1da177e4c
|
3771 3772 3773 |
/* Given an address, look for it in the module exception tables. */ const struct exception_table_entry *search_module_extables(unsigned long addr) { |
1da177e4c
|
3774 3775 |
const struct exception_table_entry *e = NULL; struct module *mod; |
24da1cbff
|
3776 |
preempt_disable(); |
d72b37513
|
3777 |
list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e34
|
3778 3779 |
if (mod->state == MODULE_STATE_UNFORMED) continue; |
1da177e4c
|
3780 3781 |
if (mod->num_exentries == 0) continue; |
22a8bdeb5
|
3782 |
|
1da177e4c
|
3783 3784 3785 3786 3787 3788 |
e = search_extable(mod->extable, mod->extable + mod->num_exentries - 1, addr); if (e) break; } |
24da1cbff
|
3789 |
preempt_enable(); |
1da177e4c
|
3790 3791 |
/* Now, if we found one, we are running inside it now, hence |
22a8bdeb5
|
3792 |
we cannot unload the module, hence no refcnt needed. */ |
1da177e4c
|
3793 3794 |
return e; } |
4d435f9d8
|
3795 |
/* |
e610499e2
|
3796 3797 3798 3799 3800 |
* is_module_address - is this address inside a module? * @addr: the address to check. * * See is_module_text_address() if you simply want to see if the address * is code (not data). |
4d435f9d8
|
3801 |
*/ |
e610499e2
|
3802 |
bool is_module_address(unsigned long addr) |
4d435f9d8
|
3803 |
{ |
e610499e2
|
3804 |
bool ret; |
4d435f9d8
|
3805 |
|
24da1cbff
|
3806 |
preempt_disable(); |
e610499e2
|
3807 |
ret = __module_address(addr) != NULL; |
24da1cbff
|
3808 |
preempt_enable(); |
4d435f9d8
|
3809 |
|
e610499e2
|
3810 |
return ret; |
4d435f9d8
|
3811 |
} |
e610499e2
|
3812 3813 3814 3815 3816 3817 3818 |
/* * __module_address - get the module which contains an address. * @addr: the address. * * Must be called with preempt disabled or module mutex held so that * module doesn't get freed during this. */ |
714f83d5d
|
3819 |
struct module *__module_address(unsigned long addr) |
1da177e4c
|
3820 3821 |
{ struct module *mod; |
3a642e99b
|
3822 3823 |
if (addr < module_addr_min || addr > module_addr_max) return NULL; |
0be964be0
|
3824 |
module_assert_mutex_or_preempt(); |
6c9692e2d
|
3825 |
mod = mod_find(addr); |
93c2e105f
|
3826 3827 |
if (mod) { BUG_ON(!within_module(addr, mod)); |
0d21b0e34
|
3828 |
if (mod->state == MODULE_STATE_UNFORMED) |
93c2e105f
|
3829 |
mod = NULL; |
0d21b0e34
|
3830 |
} |
93c2e105f
|
3831 |
return mod; |
1da177e4c
|
3832 |
} |
c6b378019
|
3833 |
EXPORT_SYMBOL_GPL(__module_address); |
1da177e4c
|
3834 |
|
e610499e2
|
3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 |
/* * is_module_text_address - is this address inside module code? * @addr: the address to check. * * See is_module_address() if you simply want to see if the address is * anywhere in a module. See kernel_text_address() for testing if an * address corresponds to kernel or module code. */ bool is_module_text_address(unsigned long addr) { bool ret; preempt_disable(); ret = __module_text_address(addr) != NULL; preempt_enable(); return ret; } /* * __module_text_address - get the module whose code contains an address. * @addr: the address. * * Must be called with preempt disabled or module mutex held so that * module doesn't get freed during this. */ struct module *__module_text_address(unsigned long addr) { struct module *mod = __module_address(addr); if (mod) { /* Make sure it's within the text section. */ |
7523e4dc5
|
3866 3867 |
if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) && !within(addr, mod->core_layout.base, mod->core_layout.text_size)) |
e610499e2
|
3868 3869 3870 3871 |
mod = NULL; } return mod; } |
c6b378019
|
3872 |
EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e2
|
3873 |
|
1da177e4c
|
3874 3875 3876 3877 |
/* Don't grab lock, we're oopsing. */ void print_modules(void) { struct module *mod; |
2bc2d61a9
|
3878 |
char buf[8]; |
1da177e4c
|
3879 |
|
b231125af
|
3880 |
printk(KERN_DEFAULT "Modules linked in:"); |
d72b37513
|
3881 3882 |
/* Most callers should already have preempt disabled, but make sure */ preempt_disable(); |
0d21b0e34
|
3883 3884 3885 |
list_for_each_entry_rcu(mod, &modules, list) { if (mod->state == MODULE_STATE_UNFORMED) continue; |
27bba4d6b
|
3886 |
pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e34
|
3887 |
} |
d72b37513
|
3888 |
preempt_enable(); |
e14af7eeb
|
3889 |
if (last_unloaded_module[0]) |
27bba4d6b
|
3890 3891 3892 |
pr_cont(" [last unloaded: %s]", last_unloaded_module); pr_cont(" "); |
1da177e4c
|
3893 |
} |
1da177e4c
|
3894 |
#ifdef CONFIG_MODVERSIONS |
8c8ef42ae
|
3895 3896 3897 3898 3899 3900 |
/* Generate the signature for all relevant module structures here. * If these change, we don't want to try to parse the module. */ void module_layout(struct module *mod, struct modversion_info *ver, struct kernel_param *kp, struct kernel_symbol *ks, |
654986462
|
3901 |
struct tracepoint * const *tp) |
8c8ef42ae
|
3902 3903 3904 |
{ } EXPORT_SYMBOL(module_layout); |
1da177e4c
|
3905 |
#endif |