diff options
| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2010-05-06 00:18:15 +0900 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2010-05-06 13:19:18 +1000 |
| commit | 292823814261e085cdcef06b6b691e6c2563fbd4 (patch) | |
| tree | 8c1eaebcf8f698ea13ac2a9291b9769abde1905e /security/tomoyo/common.c | |
| parent | 2b9e4688fad8867b6e918610f396af3ab9246898 (diff) | |
TOMOYO: Use mutex_lock_interruptible.
Some of TOMOYO's functions may sleep after mutex_lock(). If OOM-killer selected
a process which is waiting at mutex_lock(), the to-be-killed process can't be
killed. Thus, replace mutex_lock() with mutex_lock_interruptible() so that the
to-be-killed process can immediately return from TOMOYO's functions.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/tomoyo/common.c')
| -rw-r--r-- | security/tomoyo/common.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c index 3c86bbc33ae..8f34036fd31 100644 --- a/security/tomoyo/common.c +++ b/security/tomoyo/common.c @@ -874,13 +874,13 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_domain_info * const domain) static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned int profile) { - static DEFINE_MUTEX(lock); struct tomoyo_profile *ptr = NULL; int i; if (profile >= TOMOYO_MAX_PROFILES) return NULL; - mutex_lock(&lock); + if (mutex_lock_interruptible(&tomoyo_policy_lock)) + return NULL; ptr = tomoyo_profile_ptr[profile]; if (ptr) goto ok; @@ -895,7 +895,7 @@ static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned mb(); /* Avoid out-of-order execution. */ tomoyo_profile_ptr[profile] = ptr; ok: - mutex_unlock(&lock); + mutex_unlock(&tomoyo_policy_lock); return ptr; } @@ -1090,7 +1090,8 @@ static int tomoyo_update_manager_entry(const char *manager, return -ENOMEM; if (!is_delete) entry = kmalloc(sizeof(*entry), GFP_NOFS); - mutex_lock(&tomoyo_policy_lock); + if (mutex_lock_interruptible(&tomoyo_policy_lock)) + goto out; list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) { if (ptr->manager != saved_manager) continue; @@ -1107,6 +1108,7 @@ static int tomoyo_update_manager_entry(const char *manager, error = 0; } mutex_unlock(&tomoyo_policy_lock); + out: tomoyo_put_name(saved_manager); kfree(entry); return error; @@ -1287,7 +1289,8 @@ static int tomoyo_delete_domain(char *domainname) name.name = domainname; tomoyo_fill_path_info(&name); - mutex_lock(&tomoyo_policy_lock); + if (mutex_lock_interruptible(&tomoyo_policy_lock)) + return 0; /* Is there an active domain? */ list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { /* Never delete tomoyo_kernel_domain */ |