diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/core.c | 2 | ||||
| -rw-r--r-- | kernel/debug/kdb/kdb_main.c | 2 | ||||
| -rw-r--r-- | kernel/kprobes.c | 2 | ||||
| -rw-r--r-- | kernel/module.c | 91 | ||||
| -rw-r--r-- | kernel/params.c | 3 | ||||
| -rw-r--r-- | kernel/sys.c | 4 | ||||
| -rw-r--r-- | kernel/time/ntp.c | 7 | ||||
| -rw-r--r-- | kernel/time/time.c | 4 | ||||
| -rw-r--r-- | kernel/workqueue.c | 25 |
9 files changed, 97 insertions, 43 deletions
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index d6594e457a25..a64e7a207d2b 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -163,7 +163,7 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, void bpf_jit_binary_free(struct bpf_binary_header *hdr) { - module_free(NULL, hdr); + module_memfree(hdr); } #endif /* CONFIG_BPF_JIT */ diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c index f191bddf64b8..7b40c5f07dce 100644 --- a/kernel/debug/kdb/kdb_main.c +++ b/kernel/debug/kdb/kdb_main.c @@ -2023,7 +2023,7 @@ static int kdb_lsmod(int argc, const char **argv) kdb_printf("%-20s%8u 0x%p ", mod->name, mod->core_size, (void *)mod); #ifdef CONFIG_MODULE_UNLOAD - kdb_printf("%4ld ", module_refcount(mod)); + kdb_printf("%4d ", module_refcount(mod)); #endif if (mod->state == MODULE_STATE_GOING) kdb_printf(" (Unloading)"); diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 06f58309fed2..ee619929cf90 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -127,7 +127,7 @@ static void *alloc_insn_page(void) static void free_insn_page(void *page) { - module_free(NULL, page); + module_memfree(page); } struct kprobe_insn_cache kprobe_insn_slots = { diff --git a/kernel/module.c b/kernel/module.c index 3965511ae133..d856e96a3cce 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -772,9 +772,18 @@ static int try_stop_module(struct module *mod, int flags, int *forced) return 0; } -unsigned long module_refcount(struct module *mod) +/** + * 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) { - return (unsigned long)atomic_read(&mod->refcnt) - MODULE_REF_BASE; + return atomic_read(&mod->refcnt) - MODULE_REF_BASE; } EXPORT_SYMBOL(module_refcount); @@ -856,7 +865,7 @@ static inline void print_unload_info(struct seq_file *m, struct module *mod) struct module_use *use; int printed_something = 0; - seq_printf(m, " %lu ", module_refcount(mod)); + seq_printf(m, " %i ", module_refcount(mod)); /* * Always include a trailing , so userspace can differentiate @@ -908,7 +917,7 @@ EXPORT_SYMBOL_GPL(symbol_put_addr); static ssize_t show_refcnt(struct module_attribute *mattr, struct module_kobject *mk, char *buffer) { - return sprintf(buffer, "%lu\n", module_refcount(mk->mod)); + return sprintf(buffer, "%i\n", module_refcount(mk->mod)); } static struct module_attribute modinfo_refcnt = @@ -1795,7 +1804,7 @@ static void unset_module_core_ro_nx(struct module *mod) { } static void unset_module_init_ro_nx(struct module *mod) { } #endif -void __weak module_free(struct module *mod, void *module_region) +void __weak module_memfree(void *module_region) { vfree(module_region); } @@ -1804,6 +1813,10 @@ void __weak module_arch_cleanup(struct module *mod) { } +void __weak module_arch_freeing_init(struct module *mod) +{ +} + /* Free a module, remove from lists, etc. */ static void free_module(struct module *mod) { @@ -1841,7 +1854,8 @@ static void free_module(struct module *mod) /* This may be NULL, but that's OK */ unset_module_init_ro_nx(mod); - module_free(mod, mod->module_init); + module_arch_freeing_init(mod); + module_memfree(mod->module_init); kfree(mod->args); percpu_modfree(mod); @@ -1850,7 +1864,7 @@ static void free_module(struct module *mod) /* Finally, free the core (containing the module structure) */ unset_module_core_ro_nx(mod); - module_free(mod, mod->module_core); + module_memfree(mod->module_core); #ifdef CONFIG_MPU update_protections(current->mm); @@ -2785,7 +2799,7 @@ static int move_module(struct module *mod, struct load_info *info) */ kmemleak_ignore(ptr); if (!ptr) { - module_free(mod, mod->module_core); + module_memfree(mod->module_core); return -ENOMEM; } memset(ptr, 0, mod->init_size); @@ -2930,8 +2944,9 @@ static struct module *layout_and_allocate(struct load_info *info, int flags) static void module_deallocate(struct module *mod, struct load_info *info) { percpu_modfree(mod); - module_free(mod, mod->module_init); - module_free(mod, mod->module_core); + module_arch_freeing_init(mod); + module_memfree(mod->module_init); + module_memfree(mod->module_core); } int __weak module_finalize(const Elf_Ehdr *hdr, @@ -2983,10 +2998,31 @@ static void do_mod_ctors(struct module *mod) #endif } +/* 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); +} + /* This is where the real work happens */ static int do_init_module(struct module *mod) { int ret = 0; + struct mod_initfree *freeinit; + + freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); + if (!freeinit) { + ret = -ENOMEM; + goto fail; + } + freeinit->module_init = mod->module_init; /* * We want to find out whether @mod uses async during init. Clear @@ -2999,18 +3035,7 @@ static int do_init_module(struct module *mod) if (mod->init != NULL) ret = do_one_initcall(mod->init); if (ret < 0) { - /* - * Init routine failed: abort. Try to protect us from - * buggy refcounters. - */ - mod->state = MODULE_STATE_GOING; - synchronize_sched(); - module_put(mod); - blocking_notifier_call_chain(&module_notify_list, - MODULE_STATE_GOING, mod); - free_module(mod); - wake_up_all(&module_wq); - return ret; + goto fail_free_freeinit; } if (ret > 0) { pr_warn("%s: '%s'->init suspiciously returned %d, it should " @@ -3055,15 +3080,35 @@ static int do_init_module(struct module *mod) mod->strtab = mod->core_strtab; #endif unset_module_init_ro_nx(mod); - module_free(mod, mod->module_init); + module_arch_freeing_init(mod); mod->module_init = NULL; mod->init_size = 0; mod->init_ro_size = 0; mod->init_text_size = 0; + /* + * We want to free module_init, but be aware that kallsyms may be + * walking this with preempt disabled. In all the failure paths, + * we call synchronize_rcu/synchronize_sched, but we don't want + * to slow down the success path, so use actual RCU here. + */ + call_rcu(&freeinit->rcu, do_free_init); mutex_unlock(&module_mutex); wake_up_all(&module_wq); return 0; + +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; } static int may_init_module(void) diff --git a/kernel/params.c b/kernel/params.c index 0af9b2c4e56c..728e05b167de 100644 --- a/kernel/params.c +++ b/kernel/params.c @@ -642,12 +642,15 @@ static __modinit int add_sysfs_param(struct module_kobject *mk, mk->mp->grp.attrs = new_attrs; /* Tack new one on the end. */ + memset(&mk->mp->attrs[mk->mp->num], 0, sizeof(mk->mp->attrs[0])); sysfs_attr_init(&mk->mp->attrs[mk->mp->num].mattr.attr); mk->mp->attrs[mk->mp->num].param = kp; mk->mp->attrs[mk->mp->num].mattr.show = param_attr_show; /* Do not allow runtime DAC changes to make param writable. */ if ((kp->perm & (S_IWUSR | S_IWGRP | S_IWOTH)) != 0) mk->mp->attrs[mk->mp->num].mattr.store = param_attr_store; + else + mk->mp->attrs[mk->mp->num].mattr.store = NULL; mk->mp->attrs[mk->mp->num].mattr.attr.name = (char *)name; mk->mp->attrs[mk->mp->num].mattr.attr.mode = kp->perm; mk->mp->num++; diff --git a/kernel/sys.c b/kernel/sys.c index a8c9f5a7dda6..ea9c88109894 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -2210,9 +2210,13 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, up_write(&me->mm->mmap_sem); break; case PR_MPX_ENABLE_MANAGEMENT: + if (arg2 || arg3 || arg4 || arg5) + return -EINVAL; error = MPX_ENABLE_MANAGEMENT(me); break; case PR_MPX_DISABLE_MANAGEMENT: + if (arg2 || arg3 || arg4 || arg5) + return -EINVAL; error = MPX_DISABLE_MANAGEMENT(me); break; default: diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c index 87a346fd6d61..28bf91c60a0b 100644 --- a/kernel/time/ntp.c +++ b/kernel/time/ntp.c @@ -633,6 +633,13 @@ int ntp_validate_timex(struct timex *txc) if ((txc->modes & ADJ_SETOFFSET) && (!capable(CAP_SYS_TIME))) return -EPERM; + if (txc->modes & ADJ_FREQUENCY) { + if (LONG_MIN / PPM_SCALE > txc->freq) + return -EINVAL; + if (LONG_MAX / PPM_SCALE < txc->freq) + return -EINVAL; + } + return 0; } diff --git a/kernel/time/time.c b/kernel/time/time.c index 6390517e77d4..2c85b7724af4 100644 --- a/kernel/time/time.c +++ b/kernel/time/time.c @@ -196,6 +196,10 @@ SYSCALL_DEFINE2(settimeofday, struct timeval __user *, tv, if (tv) { if (copy_from_user(&user_tv, tv, sizeof(*tv))) return -EFAULT; + + if (!timeval_valid(&user_tv)) + return -EINVAL; + new_ts.tv_sec = user_tv.tv_sec; new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC; } diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 6202b08f1933..beeeac9e0e3e 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1841,17 +1841,11 @@ static void pool_mayday_timeout(unsigned long __pool) * spin_lock_irq(pool->lock) which may be released and regrabbed * multiple times. Does GFP_KERNEL allocations. Called only from * manager. - * - * Return: - * %false if no action was taken and pool->lock stayed locked, %true - * otherwise. */ -static bool maybe_create_worker(struct worker_pool *pool) +static void maybe_create_worker(struct worker_pool *pool) __releases(&pool->lock) __acquires(&pool->lock) { - if (!need_to_create_worker(pool)) - return false; restart: spin_unlock_irq(&pool->lock); @@ -1877,7 +1871,6 @@ restart: */ if (need_to_create_worker(pool)) goto restart; - return true; } /** @@ -1897,16 +1890,14 @@ restart: * multiple times. Does GFP_KERNEL allocations. * * Return: - * %false if the pool don't need management and the caller can safely start - * processing works, %true indicates that the function released pool->lock - * and reacquired it to perform some management function and that the - * conditions that the caller verified while holding the lock before - * calling the function might no longer be true. + * %false if the pool doesn't need management and the caller can safely + * start processing works, %true if management function was performed and + * the conditions that the caller verified before calling the function may + * no longer be true. */ static bool manage_workers(struct worker *worker) { struct worker_pool *pool = worker->pool; - bool ret = false; /* * Anyone who successfully grabs manager_arb wins the arbitration @@ -1919,12 +1910,12 @@ static bool manage_workers(struct worker *worker) * actual management, the pool may stall indefinitely. */ if (!mutex_trylock(&pool->manager_arb)) - return ret; + return false; - ret |= maybe_create_worker(pool); + maybe_create_worker(pool); mutex_unlock(&pool->manager_arb); - return ret; + return true; } /** |