From: Qingfang Deng <qingfang.deng@linux.dev>
To: Eric Dumazet <edumazet@google.com>, Jaeyoung Chung <jjy600901@snu.ac.kr>
Cc: andrew+netdev@lunn.ch, davem@davemloft.net, kuba@kernel.org,
netdev@vger.kernel.org, pabeni@redhat.com, 726ksm@gmail.com,
kees@kernel.org, linux-kernel@vger.kernel.org,
eulgyukim@snu.ac.kr
Subject: Re: [BUG] KASAN: slab-use-after-free Read in slip_receive_buf
Date: Wed, 26 Aug 2026 13:38:02 +0800 [thread overview]
Message-ID: <8ea9c9ce-e1ed-475b-90d3-abf1bd86c3d7@linux.dev> (raw)
In-Reply-To: <CANn89iJE_HosLBRhZGM-GVpgPCSNtHiS9vnCc3tEmTVaamcJ9g@mail.gmail.com>
Hi,
On 2026/8/25 23:27, Eric Dumazet wrote:
> On Tue, Aug 25, 2026 at 5:07 PM Jaeyoung Chung <jjy600901@snu.ac.kr> wrote:
>> Hello,
>>
>> We found a "KASAN: slab-use-after-free Read in slip_receive_buf" on Linux v7.2.
>> The issue was found by our own race fuzzer. We have not analyzed the root cause,
>> so we do not have a proposed fix to offer.
>>
>> To reproduce the race reliably, we applied the delay patch below to the
>> kernel and ran the C reproducer as root inside an x86_64 QEMU guest. The
>> crash log we observed, the delay patch and the reproducer are all included
>> below.
>>
>> The following kernel config options are required to reproduce the issue:
>> CONFIG_SLIP=y
>> CONFIG_LEGACY_TIOCSTI=y
>> CONFIG_UNIX98_PTYS=y
>> CONFIG_TTY=y
>> CONFIG_KASAN=y
>>
>> We hope this report is useful. Please let us know if any further
>> information would help.
>>
>> Reported-by: Eulgyu Kim <eulgyukim@snu.ac.kr>
>> Reported-by: Jaeyoung Chung <jjy600901@snu.ac.kr>
> This rings a bell; I had a local syzbot report for this issue a while back.
>
> I think we should remove slip_hangup().
ppp_async.c and ppp_synctty.c have the same anti-pattern. Should we
remove theirs as well?
next prev parent reply other threads:[~2026-08-26 5:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-25 15:06 [BUG] KASAN: slab-use-after-free Read in slip_receive_buf Jaeyoung Chung
2026-08-25 15:27 ` Eric Dumazet
2026-08-26 5:38 ` Qingfang Deng [this message]
2026-08-26 5:46 ` Eric Dumazet
2026-08-26 5:53 ` Qingfang Deng
2026-08-26 6:14 ` Eric Dumazet
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=8ea9c9ce-e1ed-475b-90d3-abf1bd86c3d7@linux.dev \
--to=qingfang.deng@linux.dev \
--cc=726ksm@gmail.com \
--cc=andrew+netdev@lunn.ch \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=eulgyukim@snu.ac.kr \
--cc=jjy600901@snu.ac.kr \
--cc=kees@kernel.org \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.