Revision 77788775c7132a8d93c6930ab1bd84fc743c7cb7 authored by Jens Axboe on 29 December 2020, 17:50:46 UTC, committed by Jens Axboe on 29 December 2020, 18:00:36 UTC
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: 1e6fa5216a0e ("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>
1 parent 5c8fe58
| File | Mode | Size |
|---|---|---|
| Makefile | -rw-r--r-- | 361 bytes |
| compat.c | -rw-r--r-- | 2.2 KB |
| ipc_sysctl.c | -rw-r--r-- | 6.1 KB |
| mq_sysctl.c | -rw-r--r-- | 2.7 KB |
| mqueue.c | -rw-r--r-- | 43.1 KB |
| msg.c | -rw-r--r-- | 31.6 KB |
| msgutil.c | -rw-r--r-- | 3.6 KB |
| namespace.c | -rw-r--r-- | 5.1 KB |
| sem.c | -rw-r--r-- | 62.7 KB |
| shm.c | -rw-r--r-- | 43.0 KB |
| syscall.c | -rw-r--r-- | 5.1 KB |
| util.c | -rw-r--r-- | 22.8 KB |
| util.h | -rw-r--r-- | 8.7 KB |
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