diff options
| author | Amol Grover <frextrite@gmail.com> | 2020-04-06 16:29:50 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-01 13:18:13 +0200 |
| commit | 8ebf2b77d7e5687d49fd9a1505d7fe30009a8433 (patch) | |
| tree | beb91313623e081957f53628c5967f5c908733f2 /security | |
| parent | 5b84cd71c1da50fb99cd81d526563ed2e3a93c1b (diff) | |
device_cgroup: Fix RCU list debugging warning
[ Upstream commit bc62d68e2a0a69fcdcf28aca8edb01abf306b698 ]
exceptions may be traversed using list_for_each_entry_rcu()
outside of an RCU read side critical section BUT under the
protection of decgroup_mutex. Hence add the corresponding
lockdep expression to fix the following false-positive
warning:
[ 2.304417] =============================
[ 2.304418] WARNING: suspicious RCU usage
[ 2.304420] 5.5.4-stable #17 Tainted: G E
[ 2.304422] -----------------------------
[ 2.304424] security/device_cgroup.c:355 RCU-list traversed in non-reader section!!
Signed-off-by: Amol Grover <frextrite@gmail.com>
Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/device_cgroup.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/security/device_cgroup.c b/security/device_cgroup.c index 725674f3276d..5d7bb91c6487 100644 --- a/security/device_cgroup.c +++ b/security/device_cgroup.c @@ -352,7 +352,8 @@ static bool match_exception_partial(struct list_head *exceptions, short type, { struct dev_exception_item *ex; - list_for_each_entry_rcu(ex, exceptions, list) { + list_for_each_entry_rcu(ex, exceptions, list, + lockdep_is_held(&devcgroup_mutex)) { if ((type & DEVCG_DEV_BLOCK) && !(ex->type & DEVCG_DEV_BLOCK)) continue; if ((type & DEVCG_DEV_CHAR) && !(ex->type & DEVCG_DEV_CHAR)) |