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| author | Pawan Gupta <pawan.kumar.gupta@linux.intel.com> | 2021-08-28 23:41:40 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-18 14:03:53 +0100 |
| commit | 3fac6feca95fd7e8029c72be874bd62796f2f9cb (patch) | |
| tree | 87a35c3cb3545907c2c4533aa77c92c31800453c /security | |
| parent | 02ddf26d849dd241e22a8713e15e243d851199cc (diff) | |
| download | linux-stable-3fac6feca95fd7e8029c72be874bd62796f2f9cb.tar.gz linux-stable-3fac6feca95fd7e8029c72be874bd62796f2f9cb.tar.bz2 linux-stable-3fac6feca95fd7e8029c72be874bd62796f2f9cb.zip | |
smackfs: Fix use-after-free in netlbl_catmap_walk()
[ Upstream commit 0817534ff9ea809fac1322c5c8c574be8483ea57 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/smack/smackfs.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index b88c1a953833..e33f98d25fc0 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -831,6 +831,7 @@ static int smk_open_cipso(struct inode *inode, struct file *file) static ssize_t smk_set_cipso(struct file *file, const char __user *buf, size_t count, loff_t *ppos, int format) { + struct netlbl_lsm_catmap *old_cat; struct smack_known *skp; struct netlbl_lsm_secattr ncats; char mapcatset[SMK_CIPSOLEN]; @@ -920,9 +921,11 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf, rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); if (rc >= 0) { - netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat); + old_cat = skp->smk_netlabel.attr.mls.cat; skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; + synchronize_rcu(); + netlbl_catmap_free(old_cat); rc = count; /* * This mapping may have been cached, so clear the cache. |