linux-kernel - Re: KASAN: use-after-free Read in __nf_hook_entries_try

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Message-ID: <CANn89iJ4EwLU2H4CntDbufc3ZRS9-BZrO0vXGxYosx4ELq8PgA@mail.gmail.com>
Date: Fri, 18 Oct 2024 09:06:12 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Xia Chu <jiangmo9@...il.com>
Cc: pablo@...filter.org, kadlec@...filter.org, fw@...len.de, 
	davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, 
	netfilter-devel@...r.kernel.org, coreteam@...filter.org, 
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller@...glegroups.com
Subject: Re: KASAN: use-after-free Read in __nf_hook_entries_try_shrink

On Fri, Oct 18, 2024 at 9:00 AM Xia Chu <jiangmo9@...il.com> wrote:
>
> Hi,
>
> We would like to report the following bug which has been found by our modified version of syzkaller.
>
> ======================================================
> description: KASAN: use-after-free Read in __nf_hook_entries_try_shrink
> affected file: net/netfilter/core.c
> kernel version: 5.8.0-rc4
> kernel commit: 0aea6d5c5be33ce94c16f9ab2f64de1f481f424b
> git tree: upstream
> kernel config: attached
> crash reproducer: attached
> ======================================================
> Crash log:
> BUG: KASAN: use-after-free in hooks_validate net/netfilter/core.c:177 [inline]
> BUG: KASAN: use-after-free in __nf_hook_entries_try_shrink+0x3c0/0x470 net/netfilter/core.c:260
> Read of size 4 at addr ffff888067fe4220 by task kworker/u4:2/126
>
> CPU: 1 PID: 126 Comm: kworker/u4:2 Tainted: G        W         5.8.0-rc4+ #1

This is an old version of linux, not supported.

What do you expect from us ?