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 13:11:45 +1100 [thread overview]
Message-ID: <20171110021145.GB22329@gondor.apana.org.au> (raw)
In-Reply-To: <20171110020459.GA22329@gondor.apana.org.au>
On Fri, Nov 10, 2017 at 01:04:59PM +1100, Herbert Xu wrote:
>
> 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
Oh and this is an important clue. We have two policies with
identical index values. The index value is meant to be unique
so clearly something funny is going on.
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 2:11 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
2017-11-10 2:11 ` Herbert Xu [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171110021145.GB22329@gondor.apana.org.au \
--to=herbert@gondor.apana.org.au \
--cc=bot+413384116f7f7dab7903d54c53fc4af6a4441965@syzkaller.appspotmail.com \
--cc=davem@davemloft.net \
--cc=dvyukov@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=steffen.klassert@secunet.com \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).