[SRU Jammy,OEM-5.17 0/1] CVE-2023-21400

[Thadeu Lima de Souza Cascardo]

[Impact]
Race condition on io_uring may lead to privilege escalation.

[Backport]
Fix was specific to 5.15 and 5.10. It was cleanly cherry picked on 5.15,
but needed adjustment on 5.17 to match that code that moved from
io_iopoll_completed to io_do_iopoll as the former was open coded in the
latter.

Later kernels are not affected as code has changed since 5.18.

[Potential regression]
io_uring users using IOPOLL.

Jens Axboe (1):
  io_uring: ensure IOPOLL locks around deferred work

 io_uring/io_uring.c | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

-- 
2.34.1