diff options
| author |   Pawan Gupta <pawan.kumar.gupta@linux.intel.com> | 2021-08-28 23:41:40 -0700 |
|---|---|---|
| committer |   Casey Schaufler <casey@schaufler-ca.com> | 2021-09-15 16:42:25 -0700 |
| commit | 0817534ff9ea809fac1322c5c8c574be8483ea57 (patch) | |
| tree | a76cf7ab4439063bbeb1620c50cf6a9c7ec5f1d5 /security/smack/smack_lsm.c | |
| parent | Linux 5.15-rc1 (diff) | |
| download | linux-dev-0817534ff9ea809fac1322c5c8c574be8483ea57.tar.xz linux-dev-0817534ff9ea809fac1322c5c8c574be8483ea57.zip | |
smackfs: Fix use-after-free in netlbl_catmap_walk()
Syzkaller reported use-after-free bug as described in [1]. The bug is
triggered when smk_set_cipso() tries to free stale category bitmaps
while there are concurrent reader(s) using the same bitmaps.
Wait for RCU grace period to finish before freeing the category bitmaps
in smk_set_cipso(). This makes sure that there are no more readers using
the stale bitmaps and freeing them should be safe.
[1] https://lore.kernel.org/netdev/000000000000a814c505ca657a4e@google.com/
Reported-by: syzbot+3f91de0b813cc3d19a80@syzkaller.appspotmail.com
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions