From: Hao Xu <haoxu.linux@icloud.com>
To: Jens Axboe <axboe@kernel.dk>,
syzbot <syzbot+b6c9b65b6753d333d833@syzkaller.appspotmail.com>,
asml.silence@gmail.com, io-uring@vger.kernel.org,
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] UBSAN: array-index-out-of-bounds in io_submit_sqes
Date: Tue, 31 May 2022 17:00:23 +0800 [thread overview]
Message-ID: <e0867860-12c6-e958-07de-cfbcf644b9fe@icloud.com> (raw)
In-Reply-To: <3d3c6b5f-84cd-cb25-812e-dac77e02ddbf@kernel.dk>
On 5/31/22 16:45, Jens Axboe wrote:
> On 5/31/22 1:55 AM, syzbot wrote:
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit: 3b46e4e44180 Add linux-next specific files for 20220531
>> git tree: linux-next
>> console output: https://syzkaller.appspot.com/x/log.txt?x=16e151f5f00000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=ccb8d66fc9489ef
>> dashboard link: https://syzkaller.appspot.com/bug?extid=b6c9b65b6753d333d833
>> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>>
>> Unfortunately, I don't have any reproducer for this issue yet.
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+b6c9b65b6753d333d833@syzkaller.appspotmail.com
>>
>> ================================================================================
>> ================================================================================
>> UBSAN: array-index-out-of-bounds in fs/io_uring.c:8860:19
>> index 75 is out of range for type 'io_op_def [47]'
>
> 'def' is just set here, it's not actually used after 'opcode' has been
> verified.
>
Maybe we can move it to be below the opcode check to comfort UBSAN.
next prev parent reply other threads:[~2022-05-31 9:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-31 7:55 syzbot
2022-05-31 8:45 ` Jens Axboe
2022-05-31 8:52 ` Dmitry Vyukov
2022-05-31 8:56 ` Jens Axboe
2022-05-31 9:00 ` Hao Xu [this message]
2022-05-31 9:01 ` Jens Axboe
2022-05-31 9:05 ` Dmitry Vyukov
2022-05-31 9:07 ` Jens Axboe
2022-05-31 9:14 ` Dmitry Vyukov
2022-05-31 9:53 ` Jens Axboe
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