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| author |   Jann Horn <jannh@google.com> | 2025-01-14 18:49:00 +0100 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2025-01-14 10:59:48 -0700 |
| commit | 19d340a2988d4f3e673cded9dde405d727d7e248 (patch) | |
| tree | a972160c33c1120f172f2ef330f0b8bee376eff7 /scripts/generate_rust_analyzer.py | |
| parent | io_uring: simplify the SQPOLL thread check when cancelling requests (diff) | |
| download | wireguard-linux-19d340a2988d4f3e673cded9dde405d727d7e248.tar.xz wireguard-linux-19d340a2988d4f3e673cded9dde405d727d7e248.zip | |
io_uring/rsrc: require cloned buffers to share accounting contexts
When IORING_REGISTER_CLONE_BUFFERS is used to clone buffers from uring
instance A to uring instance B, where A and B use different MMs for
accounting, the accounting can go wrong:
If uring instance A is closed before uring instance B, the pinned memory
counters for uring instance B will be decremented, even though the pinned
memory was originally accounted through uring instance A; so the MM of
uring instance B can end up with negative locked memory.
Cc: stable@vger.kernel.org
Closes: https://lore.kernel.org/r/CAG48ez1zez4bdhmeGLEFxtbFADY4Czn3CV0u9d_TMcbvRA01bg@mail.gmail.com
Fixes: 7cc2a6eadcd7 ("io_uring: add IORING_REGISTER_COPY_BUFFERS method")
Signed-off-by: Jann Horn <jannh@google.com>
Link: https://lore.kernel.org/r/20250114-uring-check-accounting-v1-1-42e4145aa743@google.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'scripts/generate_rust_analyzer.py')
0 files changed, 0 insertions, 0 deletions