summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2017-03-29 13:26:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-03-29 13:26:22 -0700
commit52b9c816807abd46c285cd8ab183fe93194bfb3f (patch)
tree3888fddd6dbaeb7a960d9c776181ee276ea40e72
parent72c33734b5fa8a788734ad2312a89b944589c5a0 (diff)
parentf843ee6dd019bcece3e74e76ad9df0155655d0df (diff)
downloadlinux-52b9c816807abd46c285cd8ab183fe93194bfb3f.tar.bz2
Merge branch 'apw' (xfrm_user fixes)
Merge xfrm_user validation fixes from Andy Whitcroft: "Two patches we are applying to Ubuntu for XFRM_MSG_NEWAE validation issue reported by ZDI. The first of these is the primary fix, and the second is for a more theoretical issue that Kees pointed out when reviewing the first" * emailed patches from Andy Whitcroft <apw@canonical.com>: xfrm_user: validate XFRM_MSG_NEWAE incoming ESN size harder xfrm_user: validate XFRM_MSG_NEWAE XFRMA_REPLAY_ESN_VAL replay_window
-rw-r--r--net/xfrm/xfrm_user.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 9705c279494b..40a8aa39220d 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -412,7 +412,14 @@ static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_es
up = nla_data(rp);
ulen = xfrm_replay_state_esn_len(up);
- if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
+ /* Check the overall length and the internal bitmap length to avoid
+ * potential overflow. */
+ if (nla_len(rp) < ulen ||
+ xfrm_replay_state_esn_len(replay_esn) != ulen ||
+ replay_esn->bmp_len != up->bmp_len)
+ return -EINVAL;
+
+ if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
return -EINVAL;
return 0;