linux-kernel - Re: general protection fault in qdisc

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Message-ID: <CAKrymDRCzCJsNJcVffRvYV+wg8zB_nLhBcDNFsh0eLP73A-mcw@mail.gmail.com>
Date: Mon, 19 Aug 2024 16:14:30 +0900
From: 김민성 <ii4gsp@...il.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: jhs@...atatu.com, xiyou.wangcong@...il.com, pabeni@...hat.com, 
	netdev@...r.kernel.org, kuba@...nel.org, jiri@...nulli.us, 
	linux-kernel@...r.kernel.org, davem@...emloft.net, syzkaller@...glegroups.com
Subject: Re: general protection fault in qdisc_reset

Thanks for the tip!

2024년 8월 19일 (월) 오후 4:13, Eric Dumazet <edumazet@...gle.com>님이 작성:
>
> On Mon, Aug 19, 2024 at 9:11 AM 김민성 <ii4gsp@...il.com> wrote:
> >
> > Hi,
> >
> > I have been fuzzing Linux 6.10.0-rc3 with Syzkaller and found.
> >
> > kernel config: https://github.com/ii4gsp/etc/blob/main/200767fee68b8d90c9cf284390e34fa9b17542c9/config_v6.10.0_rc3
> > C repro: https://github.com/ii4gsp/etc/blob/main/200767fee68b8d90c9cf284390e34fa9b17542c9/repro.cprog
> > repro syscall steps:
> > https://github.com/ii4gsp/etc/blob/main/200767fee68b8d90c9cf284390e34fa9b17542c9/repro.prog
>
> Please do not fuzz old rc kernels, this will avoid finding issues that
> were already fixed.
>
> For instance, this problem has been fixed two months ago
>
> commit bab4923132feb3e439ae45962979c5d9d5c7c1f1
> Author: Yunseong Kim <yskelg@...il.com>
> Date:   Tue Jun 25 02:33:23 2024 +0900
>
>     tracing/net_sched: NULL pointer dereference in perf_trace_qdisc_reset()