From: Steffen Klassert <steffen.klassert@secunet.com>
To: David Miller <davem@davemloft.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
Steffen Klassert <steffen.klassert@secunet.com>,
<netdev@vger.kernel.org>
Subject: [PATCH 6/6] xfrm: validate template mode
Date: Mon, 1 Oct 2018 10:58:55 +0200 [thread overview]
Message-ID: <20181001085855.12057-7-steffen.klassert@secunet.com> (raw)
In-Reply-To: <20181001085855.12057-1-steffen.klassert@secunet.com>
From: Sean Tranchetti <stranche@codeaurora.org>
XFRM mode parameters passed as part of the user templates
in the IP_XFRM_POLICY are never properly validated. Passing
values other than valid XFRM modes can cause stack-out-of-bounds
reads to occur later in the XFRM processing:
[ 140.535608] ================================================================
[ 140.543058] BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x17e4/0x1cc4
[ 140.550306] Read of size 4 at addr ffffffc0238a7a58 by task repro/5148
[ 140.557369]
[ 140.558927] Call trace:
[ 140.558936] dump_backtrace+0x0/0x388
[ 140.558940] show_stack+0x24/0x30
[ 140.558946] __dump_stack+0x24/0x2c
[ 140.558949] dump_stack+0x8c/0xd0
[ 140.558956] print_address_description+0x74/0x234
[ 140.558960] kasan_report+0x240/0x264
[ 140.558963] __asan_report_load4_noabort+0x2c/0x38
[ 140.558967] xfrm_state_find+0x17e4/0x1cc4
[ 140.558971] xfrm_resolve_and_create_bundle+0x40c/0x1fb8
[ 140.558975] xfrm_lookup+0x238/0x1444
[ 140.558977] xfrm_lookup_route+0x48/0x11c
[ 140.558984] ip_route_output_flow+0x88/0xc4
[ 140.558991] raw_sendmsg+0xa74/0x266c
[ 140.558996] inet_sendmsg+0x258/0x3b0
[ 140.559002] sock_sendmsg+0xbc/0xec
[ 140.559005] SyS_sendto+0x3a8/0x5a8
[ 140.559008] el0_svc_naked+0x34/0x38
[ 140.559009]
[ 140.592245] page dumped because: kasan: bad access detected
[ 140.597981] page_owner info is not active (free page?)
[ 140.603267]
[ 140.653503] ================================================================
Signed-off-by: Sean Tranchetti <stranche@codeaurora.org>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
---
net/xfrm/xfrm_user.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 5151b3ebf068..d0672c400c2f 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1455,6 +1455,9 @@ static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
(ut[i].family != prev_family))
return -EINVAL;
+ if (ut[i].mode >= XFRM_MODE_MAX)
+ return -EINVAL;
+
prev_family = ut[i].family;
switch (ut[i].family) {
--
2.17.1
next prev parent reply other threads:[~2018-10-01 15:35 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-01 8:58 pull request (net): ipsec 2018-10-01 Steffen Klassert
2018-10-01 8:58 ` [PATCH 1/6] xfrm: Validate address prefix lengths in the xfrm selector Steffen Klassert
2018-10-01 8:58 ` [PATCH 2/6] xfrm6: call kfree_skb when skb is toobig Steffen Klassert
2018-10-01 8:58 ` [PATCH 3/6] xfrm: reset transport header back to network header after all input transforms ahave been applied Steffen Klassert
2018-10-01 8:58 ` [PATCH 4/6] xfrm: reset crypto_done when iterating over multiple input xfrms Steffen Klassert
2018-10-01 8:58 ` [PATCH 5/6] xfrm: Fix NULL pointer dereference when skb_dst_force clears the dst_entry Steffen Klassert
2018-10-01 11:29 ` Sergei Shtylyov
2018-10-01 8:58 ` Steffen Klassert [this message]
2018-10-02 5:29 ` pull request (net): ipsec 2018-10-01 David Miller
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