lkml.org 
[lkml]   [2018]   [May]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
Subject[PATCH 3.2 087/153] xfrm_user: uncoditionally validate esn replay attribute struct
3.2.102-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Florian Westphal <fw@strlen.de>

commit d97ca5d714a5334aecadadf696875da40f1fbf3e upstream.

The sanity test added in ecd7918745234 can be bypassed, validation
only occurs if XFRM_STATE_ESN flag is set, but rest of code doesn't care
and just checks if the attribute itself is present.

So always validate. Alternative is to reject if we have the attribute
without the flag but that would change abi.

Reported-by: syzbot+0ab777c27d2bb7588f73@syzkaller.appspotmail.com
Cc: Mathias Krause <minipli@googlemail.com>
Fixes: ecd7918745234 ("xfrm_user: ensure user supplied esn replay window is valid")
Fixes: d8647b79c3b7e ("xfrm: Add user interface for esn and big anti-replay windows")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
net/xfrm/xfrm_user.c | 21 ++++++++-------------
1 file changed, 8 insertions(+), 13 deletions(-)

--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -125,22 +125,17 @@ static inline int verify_replay(struct x
struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
struct xfrm_replay_state_esn *rs;

- if (p->flags & XFRM_STATE_ESN) {
- if (!rt)
- return -EINVAL;
-
- rs = nla_data(rt);
+ if (!rt)
+ return (p->flags & XFRM_STATE_ESN) ? -EINVAL : 0;

- if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
- return -EINVAL;
+ rs = nla_data(rt);

- if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
- nla_len(rt) != sizeof(*rs))
- return -EINVAL;
- }
+ if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
+ return -EINVAL;

- if (!rt)
- return 0;
+ if (nla_len(rt) < (int)xfrm_replay_state_esn_len(rs) &&
+ nla_len(rt) != sizeof(*rs))
+ return -EINVAL;

if (p->id.proto != IPPROTO_ESP)
return -EINVAL;
\
 
 \ /
  Last update: 2018-05-30 13:29    [W:0.464 / U:2.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site