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Commit 77788775 authored by Jens Axboe's avatar Jens Axboe
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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: default avatarChristian Brauner <christian.brauner@ubuntu.com&gt;:>
Tested-by: default avatarChristian Brauner <christian.brauner@ubuntu.com&gt;:>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 5c8fe583
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