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| author |   Amol Grover <frextrite@gmail.com> | 2020-04-06 16:29:50 +0530 |
|---|---|---|
| committer |   James Morris <jmorris@namei.org> | 2020-08-20 11:25:03 -0700 |
| commit | bc62d68e2a0a69fcdcf28aca8edb01abf306b698 (patch) | |
| tree | f0fc3b848bf3d3df26fb1ac238d084bb73e08c9b | |
| parent | Linux 5.8 (diff) | |
| download | linux-dev-bc62d68e2a0a69fcdcf28aca8edb01abf306b698.tar.xz linux-dev-bc62d68e2a0a69fcdcf28aca8edb01abf306b698.zip | |
device_cgroup: Fix RCU list debugging warning
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>
| -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 43ab0ad45c1b..04375df52fc9 100644 --- a/security/device_cgroup.c +++ b/security/device_cgroup.c @@ -354,7 +354,8 @@ 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)) |