linux-kernel - Re: KASAN: slab-out-of-bounds in hfsplus_bnode

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Message-Id: <5703A932-C5B0-4C98-BC5D-133F6E7943B3@m.fudan.edu.cn>
Date: Wed, 7 May 2025 18:03:15 +0800
From: 胡焜 <huk23@...udan.edu.cn>
To: Viacheslav Dubeyko <slava@...eyko.com>
Cc: Viacheslav Dubeyko <Slava.Dubeyko@....com>,
 "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "glaubitz@...sik.fu-berlin.de" <glaubitz@...sik.fu-berlin.de>,
 "frank.li@...o.com" <frank.li@...o.com>,
 "baishuoran@...eu.edu.cn" <baishuoran@...eu.edu.cn>,
 "jjtan24@...udan.edu.cn" <jjtan24@...udan.edu.cn>
Subject: Re: KASAN: slab-out-of-bounds in hfsplus_bnode_read+0x268/0x290

> I have the fix and I would like to check it. I am trying to use the C
> reproducer for triggering the issue. Probably, I am doing something
> wrong. I have complied the kernel by using the shared kernel config and
> I have compiled the C reproducer. It works several hours already and I
> still cannot trigger the issue. Am I doing something wrong? How long
> should I wait the issue reproduction? Could you please share the
> correct way of the issue reproduction?
> 
> Thanks,
> Slava. 
> 

Hi Slava,
Thank you for taking your time.

We originally obtained this issue's syz and C reproducers using Syzkaller's repro tool (refer to the URL below). The issue was triggered when we ran the syz reproducer through Syzkaller.

Url: https://github.com/google/syzkaller/blob/master/docs/reproducing_crashes.md

Syzkaller also provides syz-execprog to verify whether the C program can trigger the issue. We are currently in the process of verifying whether the C reproducer can reliably reproduce the issue. Please allow us some time to complete this verification.

We'll follow up with you once we have more concrete results.

Best regards,
Kun