ACK[J]+NACK[L]/Cmnt: [SRU][Lunar 0/2, Jammy 0/1] CVE-2023-46862

[Stefan Bader]

On 22.01.24 19:24, Bethany Jamison wrote:
> [Impact]
> 
> An issue was discovered in the Linux kernel through 6.5.9. During a
> race with SQ thread exit, an io_uring/fdinfo.c io_uring_show_fdinfo
> NULL pointer dereference can occur.
> 
> [Fix]
> 
> Lunar: Clean cherry-pick.
> Jammy: Manual backport of original fix commit. The structure of
> io_uring in Jammy is different from  upstream, so I found where the
> chunk of code had been moved to in Jammy and directly applied the
> changes.
> 
> [Test Case]
> 
> Compile and boot test.
> 
> [Regression Potential]
> 
> Issues could occur during SQ thread exit races.
> 
> Jens Axboe (2):
>    io_uring/fdinfo: get rid of ref tryget
>    io_uring/fdinfo: lock SQ thread while retrieving thread cpu/pid
> 
>   io_uring/fdinfo.c | 36 ++++++++++++++++++------------------
>   1 file changed, 18 insertions(+), 18 deletions(-)
> 
Lunar goes EOL by Jan-25. There is no planned future update on it. For 
Jammy with emphasis on that "manually backported" must be amended when 
applying.

Acked-by: Stefan Bader <stefan.bader at canonical.com>

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