lkml.org 
[lkml]   [2022]   [May]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: [syzbot] UBSAN: array-index-out-of-bounds in io_submit_sqes
    From
    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: 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.

    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

    \
     
     \ /
      Last update: 2022-05-31 11:03    [W:2.655 / U:0.032 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site