ACK: [UBUNTU OEM-5.17,OEM-6.0 0/5] CVE-2023-0468

[Tim Gardner]

On 4/4/23 6:08 PM, Thadeu Lima de Souza Cascardo wrote:
> [Impact]
>   Lin Ma discovered a race condition in the io_uring subsystem in the Linux
>   kernel, leading to a null pointer dereference vulnerability. A local
>   attacker could use this to cause a denial of service (system crash).
> 
> [Fix/Backport]
> 5.15 version of these were applied to 5.17. 6.0 were clean upstream
> cherry-picks.
> 
> [Potential regression]
> io_uring users could regress.
> 
> Lin Ma (1):
>    io_uring/poll: fix poll_refs race with cancelation
> 
> Pavel Begunkov (4):
>    io_uring: update res mask in io_poll_check_events
>    io_uring: fix tw losing poll events
>    io_uring: cmpxchg for poll arm refs release
>    io_uring: make poll refs more robust
> 
>   fs/io_uring.c | 57 ++++++++++++++++++++++++++++++++++++++++++++-------
>   1 file changed, 50 insertions(+), 7 deletions(-)
> 
Acked-by: Tim Gardner <tim.gardner at canonical.com>
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Tim Gardner
Canonical, Inc