linux-kernel - Re: [syzbot] UBSAN: array-index-out-of-bounds in io_submit

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Date:   Tue, 31 May 2022 02:45:04 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     syzbot <syzbot+b6c9b65b6753d333d833@...kaller.appspotmail.com>,
        asml.silence@...il.com, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] UBSAN: array-index-out-of-bounds in io_submit_sqes

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@...kaller.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.

-- 
Jens Axboe