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>
diff --git a/security/tomoyo/gc.c b/security/tomoyo/gc.c
index d9ad35b..245bf42 100644
--- a/security/tomoyo/gc.c
+++ b/security/tomoyo/gc.c
@@ -151,7 +151,8 @@
static void tomoyo_collect_entry(void)
{
- mutex_lock(&tomoyo_policy_lock);
+ if (mutex_lock_interruptible(&tomoyo_policy_lock))
+ return;
{
struct tomoyo_globally_readable_file_entry *ptr;
list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list,
@@ -275,8 +276,6 @@
break;
}
}
- mutex_unlock(&tomoyo_policy_lock);
- mutex_lock(&tomoyo_name_list_lock);
{
int i;
for (i = 0; i < TOMOYO_MAX_HASH; i++) {
@@ -294,7 +293,7 @@
}
}
}
- mutex_unlock(&tomoyo_name_list_lock);
+ mutex_unlock(&tomoyo_policy_lock);
}
static void tomoyo_kfree_entry(void)