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>

1 files changed, 3 insertions, 4 deletions

diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index 6a51e0af2417..62062a68525a 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -240,8 +240,6 @@ void tomoyo_memory_free(void *ptr)
  * "const struct tomoyo_path_info *".
  */
 struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
-/* Lock for protecting tomoyo_name_list . */
-DEFINE_MUTEX(tomoyo_name_list_lock);
 
 /**
  * tomoyo_get_name - Allocate permanent memory for string data.
@@ -263,7 +261,8 @@ const struct tomoyo_path_info *tomoyo_get_name(const char *name)
         len = strlen(name) + 1;
         hash = full_name_hash((const unsigned char *) name, len - 1);
         head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)];
-        mutex_lock(&tomoyo_name_list_lock);
+        if (mutex_lock_interruptible(&tomoyo_policy_lock))
+                return NULL;
         list_for_each_entry(ptr, head, list) {
                 if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name))
                         continue;
@@ -290,7 +289,7 @@ const struct tomoyo_path_info *tomoyo_get_name(const char *name)
         tomoyo_fill_path_info(&ptr->entry);
         list_add_tail(&ptr->list, head);
  out:
-        mutex_unlock(&tomoyo_name_list_lock);
+        mutex_unlock(&tomoyo_policy_lock);
         return ptr ? &ptr->entry : NULL;
 }