From: Jens Axboe <[email protected]>
To: Hao Xu <[email protected]>,
syzbot <[email protected]>,
[email protected], [email protected],
[email protected], [email protected]
Subject: Re: [syzbot] UBSAN: array-index-out-of-bounds in io_submit_sqes
Date: Tue, 31 May 2022 03:01:44 -0600 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 5/31/22 3:00 AM, Hao Xu wrote:
> 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: [email protected]
>>>
>>> ================================================================================
>>> ================================================================================
>>> 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.
Yeah that's what I did, just rebased it to get rid of it:
https://git.kernel.dk/cgit/linux-block/commit/?h=io_uring-5.19&id=fcde59feb1affb6d56aecadc3868df4631480da5
--
Jens Axboe
next prev parent reply other threads:[~2022-05-31 9:01 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-31 7:55 [syzbot] UBSAN: array-index-out-of-bounds in io_submit_sqes 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
2022-05-31 9:01 ` Jens Axboe [this message]
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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