From: Herbert Xu <herbert@gondor.apana.org.au>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: syzbot
<bot+413384116f7f7dab7903d54c53fc4af6a4441965@syzkaller.appspotmail.com>,
David Miller <davem@davemloft.net>,
LKML <linux-kernel@vger.kernel.org>,
netdev <netdev@vger.kernel.org>,
Steffen Klassert <steffen.klassert@secunet.com>,
syzkaller-bugs@googlegroups.com
Subject: Re: kernel BUG at net/key/af_key.c:LINE!
Date: Fri, 10 Nov 2017 13:04:59 +1100 [thread overview]
Message-ID: <20171110020459.GA22329@gondor.apana.org.au> (raw)
In-Reply-To: <20171109113857.GA15280@gondor.apana.org.au>
On Thu, Nov 09, 2017 at 10:38:57PM +1100, Herbert Xu wrote:
>
> The xfrm code path is meant to forbid the creation of such a policy.
> I don't currently see how this is bypassing that check. But
> clearly it has found a way through the check since it's crashing.
By castrating the reproducer to not perform a pfkey dump I have
captured the corrupted policy via xfrm:
src ???/0 dst ???/0 uid 0
socket in action allow index 2083 priority 0 ptype main share any flag (0x00000000)
lifetime config:
limit: soft 0(bytes), hard 0(bytes)
limit: soft 0(packets), hard 0(packets)
expire add: soft 0(sec), hard 0(sec)
expire use: soft 0(sec), hard 0(sec)
lifetime current:
0(bytes), 0(packets)
add 2017-11-10 09:58:17 use 2017-11-10 09:58:20
tmpl src ac14:bb:: dst ::
proto 0 spi 0x00000000(0) reqid 0(0x00000000) mode transport
level 5 share any
enc-mask 00000000 auth-mask 00000000 comp-mask 00000000
For comparison here is a good policy that was also created by the
reproducer:
src fe80::bb/0 dst ::/0 uid 0
socket in action allow index 2083 priority 0 ptype main share any flag (0x00000000)
lifetime config:
limit: soft 0(bytes), hard 0(bytes)
limit: soft 0(packets), hard 0(packets)
expire add: soft 0(sec), hard 0(sec)
expire use: soft 0(sec), hard 0(sec)
lifetime current:
0(bytes), 0(packets)
add 2017-11-10 09:58:17 use 2017-11-10 09:58:17
tmpl src ac14:bb:: dst ::
proto 0 spi 0x00000000(0) reqid 0(0x00000000) mode transport
level 5 share any
enc-mask 00000000 auth-mask 00000000 comp-mask 00000000
Cheers,
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
next prev parent reply other threads:[~2017-11-10 2:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-24 15:08 kernel BUG at net/key/af_key.c:LINE! syzbot
2017-10-24 15:10 ` Dmitry Vyukov
2017-11-08 7:47 ` Herbert Xu
2017-11-08 7:59 ` Dmitry Vyukov
2017-11-08 8:00 ` Dmitry Vyukov
2017-11-09 11:38 ` Herbert Xu
2017-11-10 2:04 ` Herbert Xu [this message]
2017-11-10 2:11 ` Herbert Xu
2017-11-10 2:30 ` Herbert Xu
2017-11-10 3:14 ` Herbert Xu
2017-11-15 11:29 ` Steffen Klassert
2017-12-03 20:28 ` Eric Biggers
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