linux-kernel - Re: [syzbot] [net?] KASAN: slab-use-after-free Read in unix_stream_read

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Message-ID: <CANn89iLfdNpdibU=kWZKgHPAeMSpekePovmBNbaox4d=Zyr+OA@mail.gmail.com>
Date: Thu, 5 Sep 2024 10:04:10 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Shoaib Rao <rao.shoaib@...cle.com>
Cc: syzbot <syzbot+8811381d455e3e9ec788@...kaller.appspotmail.com>, 
	davem@...emloft.net, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] KASAN: slab-use-after-free Read in
 unix_stream_read_actor (2)

On Thu, Sep 5, 2024 at 9:35 AM Shoaib Rao <rao.shoaib@...cle.com> wrote:
>

> >
> Hi All,
>
> I am not able to reproduce the issue. I have run the C program at least
> 100 times in a loop. In the I do get an EFAULT, not sure if that is
> intentional or not but no panic. Should I be doing something
> differently? The kernel version I am using is
> v6.11-rc6-70-gc763c4339688. Later I can try with the exact version.


Have you selected ASAN in your kernel build ?

CONFIG_KASAN=y
CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX=y
CONFIG_KASAN_GENERIC=y
CONFIG_KASAN_INLINE=y
CONFIG_KASAN_STACK=y
CONFIG_KASAN_VMALLOC=y

>
> [rshoaib@...bo-2 debug_pnic]$ gcc cause_panic.c -o panic_sys
> [rshoaib@...bo-2 debug_pnic]$ strace -f ./panic_sys
> execve("./panic_sys", ["./panic_sys"], 0x7ffe7d271d38 /* 63 vars */) = 0
> brk(NULL)                               = 0x18104000