io_uring: don't assume mm is constant across submits
If we COW the identity, we assume that ->mm never changes. But this isn't true of multiple processes end up sharing the ring. Hence treat id->mm like like any other process compontent when it comes to the identity mapping. This is pretty trivial, just moving the existing grab into io_grab_identity(), and including a check for the match. Cc: stable@vger.kernel.org # 5.10 Fixes: 1e6fa521 ("io_uring: COW io_identity on mismatch") Reported-by:Christian Brauner <christian.brauner@ubuntu.com>:> Tested-by:
Christian Brauner <christian.brauner@ubuntu.com>:> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
parent
5c8fe583
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