ACK: [SRU OEM-6.0 0/4] CVE-2023-2430

[Cengiz Can]

On Wed, 2023-06-14 at 18:56 -0300, Thadeu Lima de Souza Cascardo wrote:
> [Impact]
> A race condition when sending a MSG_RING operation to an IOPOLL
> io_uring
> may lead to incorrect behavior.
> 
> [Test case]
> A test case was prepared where incorrect behavior was observed,
> indicating
> a race condition. On 6.0, EAGAIN was observed indicating lock
> contention,
> but successful results were also observed.
> 
> [Backport]
> Except for the last one, all clean cherry-picks.
> 
> [Potential regression]
> io_uring users relying on MSG_RING or IOPOLL would be affected.
> 
> Jens Axboe (2):
>   io_uring/msg_ring: move double lock/unlock helpers higher up
>   io_uring/msg_ring: fix missing lock on overflow for IOPOLL
> 
> Pavel Begunkov (2):
>   io_uring: get rid of double locking
>   io_uring: extract a io_msg_install_complete helper

Acked-by: Cengiz Can <cengiz.can at canonical.com>

> 
>  io_uring/msg_ring.c | 135 +++++++++++++++++++++++++++---------------
> --
>  io_uring/msg_ring.h |   1 +
>  io_uring/opdef.c    |   1 +
>  3 files changed, 84 insertions(+), 53 deletions(-)
> 
> -- 
> 2.34.1
> 
>