diff options
Diffstat (limited to 'kernel/module/main.c')
| -rw-r--r-- | kernel/module/main.c | 65 |
1 files changed, 60 insertions, 5 deletions
diff --git a/kernel/module/main.c b/kernel/module/main.c index 75b23257128d..01fffa8afef2 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -56,6 +56,7 @@ #include <linux/dynamic_debug.h> #include <linux/audit.h> #include <linux/cfi.h> +#include <linux/debugfs.h> #include <uapi/linux/module.h> #include "internal.h" @@ -2500,6 +2501,18 @@ static noinline int do_init_module(struct module *mod) { int ret = 0; struct mod_initfree *freeinit; +#if defined(CONFIG_MODULE_STATS) + unsigned int text_size = 0, total_size = 0; + + for_each_mod_mem_type(type) { + const struct module_memory *mod_mem = &mod->mem[type]; + if (mod_mem->size) { + total_size += mod_mem->size; + if (type == MOD_TEXT || type == MOD_INIT_TEXT) + text_size += mod_mem->size; + } + } +#endif freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); if (!freeinit) { @@ -2561,6 +2574,7 @@ static noinline int do_init_module(struct module *mod) mod->mem[type].base = NULL; mod->mem[type].size = 0; } + #ifdef CONFIG_DEBUG_INFO_BTF_MODULES /* .BTF is not SHF_ALLOC and will get removed, so sanitize pointer */ mod->btf_data = NULL; @@ -2584,6 +2598,11 @@ static noinline int do_init_module(struct module *mod) mutex_unlock(&module_mutex); wake_up_all(&module_wq); + mod_stat_add_long(text_size, &total_text_size); + mod_stat_add_long(total_size, &total_mod_size); + + mod_stat_inc(&modcount); + return 0; fail_free_freeinit: @@ -2599,6 +2618,7 @@ fail: ftrace_release_mod(mod); free_module(mod); wake_up_all(&module_wq); + return ret; } @@ -2632,7 +2652,8 @@ static bool finished_loading(const char *name) } /* Must be called with module_mutex held */ -static int module_patient_check_exists(const char *name) +static int module_patient_check_exists(const char *name, + enum fail_dup_mod_reason reason) { struct module *old; int err = 0; @@ -2655,6 +2676,9 @@ static int module_patient_check_exists(const char *name) old = find_module_all(name, strlen(name), true); } + if (try_add_failed_module(name, reason)) + pr_warn("Could not add fail-tracking for module: %s\n", name); + /* * We are here only when the same module was being loaded. Do * not try to load it again right now. It prevents long delays @@ -2679,7 +2703,7 @@ static int add_unformed_module(struct module *mod) mod->state = MODULE_STATE_UNFORMED; mutex_lock(&module_mutex); - err = module_patient_check_exists(mod->name); + err = module_patient_check_exists(mod->name, FAIL_DUP_MOD_LOAD); if (err) goto out; @@ -2800,6 +2824,7 @@ static int load_module(struct load_info *info, const char __user *uargs, int flags) { struct module *mod; + bool module_allocated = false; long err = 0; char *after_dashes; @@ -2839,6 +2864,8 @@ static int load_module(struct load_info *info, const char __user *uargs, goto free_copy; } + module_allocated = true; + audit_log_kern_module(mod->name); /* Reserve our place in the list. */ @@ -2983,6 +3010,7 @@ static int load_module(struct load_info *info, const char __user *uargs, synchronize_rcu(); mutex_unlock(&module_mutex); free_module: + mod_stat_bump_invalid(info, flags); /* Free lock-classes; relies on the preceding sync_rcu() */ for_class_mod_mem_type(type, core_data) { lockdep_free_key_range(mod->mem[type].base, @@ -2991,6 +3019,13 @@ static int load_module(struct load_info *info, const char __user *uargs, module_deallocate(mod, info); free_copy: + /* + * The info->len is always set. We distinguish between + * failures once the proper module was allocated and + * before that. + */ + if (!module_allocated) + mod_stat_bump_becoming(info, flags); free_copy(info, flags); return err; } @@ -3009,8 +3044,11 @@ SYSCALL_DEFINE3(init_module, void __user *, umod, umod, len, uargs); err = copy_module_from_user(umod, len, &info); - if (err) + if (err) { + mod_stat_inc(&failed_kreads); + mod_stat_add_long(len, &invalid_kread_bytes); return err; + } return load_module(&info, uargs, 0); } @@ -3035,14 +3073,20 @@ SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) len = kernel_read_file_from_fd(fd, 0, &buf, INT_MAX, NULL, READING_MODULE); - if (len < 0) + if (len < 0) { + mod_stat_inc(&failed_kreads); + mod_stat_add_long(len, &invalid_kread_bytes); return len; + } if (flags & MODULE_INIT_COMPRESSED_FILE) { err = module_decompress(&info, buf, len); vfree(buf); /* compressed data is no longer needed */ - if (err) + if (err) { + mod_stat_inc(&failed_decompress); + mod_stat_add_long(len, &invalid_decompress_bytes); return err; + } } else { info.hdr = buf; info.len = len; @@ -3216,3 +3260,14 @@ void print_modules(void) last_unloaded_module.taints); pr_cont("\n"); } + +#ifdef CONFIG_MODULE_DEBUGFS +struct dentry *mod_debugfs_root; + +static int module_debugfs_init(void) +{ + mod_debugfs_root = debugfs_create_dir("modules", NULL); + return 0; +} +module_init(module_debugfs_init); +#endif |