diff options
Diffstat (limited to 'kernel/module.c')
-rw-r--r-- | kernel/module.c | 58 |
1 files changed, 27 insertions, 31 deletions
diff --git a/kernel/module.c b/kernel/module.c index d856e96..b3d634e 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -1225,6 +1225,12 @@ static const struct kernel_symbol *resolve_symbol(struct module *mod, const unsigned long *crc; int err; + /* + * 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(); mutex_lock(&module_mutex); sym = find_symbol(name, &owner, &crc, !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); @@ -2305,11 +2311,13 @@ static void layout_symtab(struct module *mod, struct load_info *info) info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym); mod->core_size += strtab_size; + mod->core_size = debug_align(mod->core_size); /* Put string table section at end of init part of module. */ strsect->sh_flags |= SHF_ALLOC; strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, info->index.str) | INIT_OFFSET_MASK; + mod->init_size = debug_align(mod->init_size); pr_debug("\t%s\n", info->secstrings + strsect->sh_name); } @@ -2978,6 +2986,12 @@ static bool finished_loading(const char *name) struct module *mod; bool ret; + /* + * 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(); mutex_lock(&module_mutex); mod = find_module_all(name, strlen(name), true); ret = !mod || mod->state == MODULE_STATE_LIVE @@ -3011,8 +3025,13 @@ static void do_free_init(struct rcu_head *head) kfree(m); } -/* This is where the real work happens */ -static int do_init_module(struct module *mod) +/* + * 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) { int ret = 0; struct mod_initfree *freeinit; @@ -3120,32 +3139,6 @@ static int may_init_module(void) } /* - * Can't use wait_event_interruptible() because our condition - * 'finished_loading()' contains a blocking primitive itself (mutex_lock). - */ -static int wait_finished_loading(struct module *mod) -{ - DEFINE_WAIT_FUNC(wait, woken_wake_function); - int ret = 0; - - add_wait_queue(&module_wq, &wait); - for (;;) { - if (finished_loading(mod->name)) - break; - - if (signal_pending(current)) { - ret = -ERESTARTSYS; - break; - } - - wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); - } - remove_wait_queue(&module_wq, &wait); - - return ret; -} - -/* * 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. @@ -3165,8 +3158,8 @@ again: || old->state == MODULE_STATE_UNFORMED) { /* Wait in case it fails to load. */ mutex_unlock(&module_mutex); - - err = wait_finished_loading(mod); + err = wait_event_interruptible(module_wq, + finished_loading(mod->name)); if (err) goto out_unlocked; goto again; @@ -3265,7 +3258,7 @@ static int load_module(struct load_info *info, const char __user *uargs, mod->sig_ok = info->sig_ok; if (!mod->sig_ok) { pr_notice_once("%s: module verification failed: signature " - "and/or required key missing - tainting " + "and/or required key missing - tainting " "kernel\n", mod->name); add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); } @@ -3356,6 +3349,9 @@ static int load_module(struct load_info *info, const char __user *uargs, module_bug_cleanup(mod); mutex_unlock(&module_mutex); + /* Free lock-classes: */ + lockdep_free_key_range(mod->module_core, mod->core_size); + /* we can't deallocate the module until we clear memory protection */ unset_module_init_ro_nx(mod); unset_module_core_ro_nx(mod); |