io_uring: hold mmap_sem for mm->locked_vm manipulation

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The kernel doesn't seem to have clear rules around this, but various
spots are using the mmap_sem to serialize access to modifying the
locked_vm count. Play it safe and lock the mm for write when accounting
or unaccounting locked memory.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Jens Axboe 2020-12-17 07:53:33 -07:00

parent a146468d76

commit 4bc4a91253

1 changed files with 10 additions and 4 deletions

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fs/io_uring.c

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