diff options
| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2021-02-01 11:52:11 +0900 |
|---|---|---|
| committer | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2021-02-01 11:52:11 +0900 |
| commit | 5797e861e402fff2bedce4ec8b7c89f4248b6073 (patch) | |
| tree | 8703689665da1be3512f2a3efa3024f6404dea9c /security/tomoyo/util.c | |
| parent | 1048ba83fb1c00cd24172e23e8263972f6b5d9ac (diff) | |
tomoyo: ignore data race while checking quota
syzbot is reporting that tomoyo's quota check is racy [1]. But this check
is tolerant of some degree of inaccuracy. Thus, teach KCSAN to ignore
this data race.
[1] https://syzkaller.appspot.com/bug?id=999533deec7ba6337f8aa25d8bd1a4d5f7e50476
Reported-by: syzbot <syzbot+0789a72b46fd91431bd8@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Diffstat (limited to 'security/tomoyo/util.c')
| -rw-r--r-- | security/tomoyo/util.c | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c index 176b803ebcfc..e89cac913583 100644 --- a/security/tomoyo/util.c +++ b/security/tomoyo/util.c @@ -1058,30 +1058,30 @@ bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r) if (ptr->is_deleted) continue; + /* + * Reading perm bitmap might race with tomoyo_merge_*() because + * caller does not hold tomoyo_policy_lock mutex. But exceeding + * max_learning_entry parameter by a few entries does not harm. + */ switch (ptr->type) { case TOMOYO_TYPE_PATH_ACL: - perm = container_of(ptr, struct tomoyo_path_acl, head) - ->perm; + data_race(perm = container_of(ptr, struct tomoyo_path_acl, head)->perm); break; case TOMOYO_TYPE_PATH2_ACL: - perm = container_of(ptr, struct tomoyo_path2_acl, head) - ->perm; + data_race(perm = container_of(ptr, struct tomoyo_path2_acl, head)->perm); break; case TOMOYO_TYPE_PATH_NUMBER_ACL: - perm = container_of(ptr, struct tomoyo_path_number_acl, - head)->perm; + data_race(perm = container_of(ptr, struct tomoyo_path_number_acl, head) + ->perm); break; case TOMOYO_TYPE_MKDEV_ACL: - perm = container_of(ptr, struct tomoyo_mkdev_acl, - head)->perm; + data_race(perm = container_of(ptr, struct tomoyo_mkdev_acl, head)->perm); break; case TOMOYO_TYPE_INET_ACL: - perm = container_of(ptr, struct tomoyo_inet_acl, - head)->perm; + data_race(perm = container_of(ptr, struct tomoyo_inet_acl, head)->perm); break; case TOMOYO_TYPE_UNIX_ACL: - perm = container_of(ptr, struct tomoyo_unix_acl, - head)->perm; + data_race(perm = container_of(ptr, struct tomoyo_unix_acl, head)->perm); break; case TOMOYO_TYPE_MANUAL_TASK_ACL: perm = 0; |