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

[Timo Aaltonen]

Thadeu Lima de Souza Cascardo kirjoitti 15.6.2023 klo 0.56:
> [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
> 
>   io_uring/msg_ring.c | 135 +++++++++++++++++++++++++++-----------------
>   io_uring/msg_ring.h |   1 +
>   io_uring/opdef.c    |   1 +
>   3 files changed, 84 insertions(+), 53 deletions(-)
> 

applied to oem-6.0, thanks

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t