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 |
|---|---|---|
| Kconfig | -rw-r--r-- | 75.6 KB |
| Makefile | -rw-r--r-- | 1.2 KB |
| calibrate.c | -rw-r--r-- | 8.6 KB |
| do_mounts.c | -rw-r--r-- | 14.9 KB |
| do_mounts.h | -rw-r--r-- | 908 bytes |
| do_mounts_initrd.c | -rw-r--r-- | 3.4 KB |
| do_mounts_rd.c | -rw-r--r-- | 7.7 KB |
| init_task.c | -rw-r--r-- | 6.1 KB |
| initramfs.c | -rw-r--r-- | 13.9 KB |
| main.c | -rw-r--r-- | 37.5 KB |
| noinitramfs.c | -rw-r--r-- | 813 bytes |
| version.c | -rw-r--r-- | 1.3 KB |
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