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2f076a453f
io_ring_ctx's enabled with IORING_SETUP_SINGLE_ISSUER are only allowed
a single task submitting to the ctx. Although the documentation only
mentions this restriction applying to io_uring_enter() syscalls,
commit d7cce96c44 ("io_uring: limit registration w/ SINGLE_ISSUER")
extends it to io_uring_register(). Ensuring only one task interacts
with the io_ring_ctx will be important to allow this task to avoid
taking the uring_lock.
There is, however, one gap in these checks: io_register_clone_buffers()
may take the uring_lock on a second (source) io_ring_ctx, but
__io_uring_register() only checks the current thread against the
*destination* io_ring_ctx's submitter_task. Fail the
IORING_REGISTER_CLONE_BUFFERS with -EEXIST if the source io_ring_ctx has
a registered submitter_task other than the current task.
Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1571 lines
36 KiB
1571 lines
36 KiB