path: root/net
diff options
authorJohannes Berg <johannes.berg@intel.com>2013-08-13 09:04:05 +0200
committerDavid S. Miller <davem@davemloft.net>2013-08-13 00:57:06 -0700
commit58ad436fcf49810aa006016107f494c9ac9013db (patch)
tree0853904283d081562e2c07bed067c36e03936c0c /net
parent771085d6bf3c52de29fc213e5bad07a82e57c23e (diff)
genetlink: fix family dump race
When dumping generic netlink families, only the first dump call is locked with genl_lock(), which protects the list of families, and thus subsequent calls can access the data without locking, racing against family addition/removal. This can cause a crash. Fix it - the locking needs to be conditional because the first time around it's already locked. A similar bug was reported to me on an old kernel (3.4.47) but the exact scenario that happened there is no longer possible, on those kernels the first round wasn't locked either. Looking at the current code I found the race described above, which had also existed on the old kernel. Cc: stable@vger.kernel.org Reported-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
1 files changed, 7 insertions, 0 deletions
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 512718adb0d..f85f8a2ad6c 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -789,6 +789,10 @@ static int ctrl_dumpfamily(struct sk_buff *skb, struct netlink_callback *cb)
struct net *net = sock_net(skb->sk);
int chains_to_skip = cb->args[0];
int fams_to_skip = cb->args[1];
+ bool need_locking = chains_to_skip || fams_to_skip;
+ if (need_locking)
+ genl_lock();
for (i = chains_to_skip; i < GENL_FAM_TAB_SIZE; i++) {
n = 0;
@@ -810,6 +814,9 @@ errout:
cb->args[0] = i;
cb->args[1] = n;
+ if (need_locking)
+ genl_unlock();
return skb->len;