TOMOYO: Fix race on updating profile's comment line.

In tomoyo_write_profile() since 2.6.34, a lock was by error missing when
replacing profile's comment line. If multiple threads attempted

  echo '0-COMMENT=comment' > /sys/kernel/security/tomoyo/profile

in parallel, garbage collector will fail to kfree() the old value.
Protect the replacement using a lock. Also, keep the old value rather than
replace with empty string when out of memory error has occurred.

Signed-off-by: Xiaochen Wang <wangxiaochen0@gmail.com>
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/common.c b/security/tomoyo/common.c
index 7556315..2b7b1a1 100644 (file)
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -459,8 +459,16 @@ static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
        if (profile == &tomoyo_default_profile)
                return -EINVAL;
        if (!strcmp(data, "COMMENT")) {
-               const struct tomoyo_path_info *old_comment = profile->comment;
-               profile->comment = tomoyo_get_name(cp);
+               static DEFINE_SPINLOCK(lock);
+               const struct tomoyo_path_info *new_comment
+                       = tomoyo_get_name(cp);
+               const struct tomoyo_path_info *old_comment;
+               if (!new_comment)
+                       return -ENOMEM;
+               spin_lock(&lock);
+               old_comment = profile->comment;
+               profile->comment = new_comment;
+               spin_unlock(&lock);
                tomoyo_put_name(old_comment);
                return 0;
        }