Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 6.0 017/862] io_uring: limit registration w/ SINGLE_ISSUER | Date | Wed, 19 Oct 2022 10:21:44 +0200 |
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From: Pavel Begunkov <asml.silence@gmail.com>
commit d7cce96c449e35bbfd41e830b341b95973891eed upstream.
IORING_SETUP_SINGLE_ISSUER restricts what tasks can submit requests. Extend it to registration as well, so non-owning task can't do registrations. It's not necessary at the moment but might be useful in the future.
Cc: <stable@vger.kernel.org> # 6.0 Fixes: 97bbdc06a444 ("io_uring: add IORING_SETUP_SINGLE_ISSUER") Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/f52a6a9c8a8990d4a831f73c0571e7406aac2bba.1664237592.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- io_uring/io_uring.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -3710,6 +3710,9 @@ static int __io_uring_register(struct io if (WARN_ON_ONCE(percpu_ref_is_dying(&ctx->refs))) return -ENXIO; + if (ctx->submitter_task && ctx->submitter_task != current) + return -EEXIST; + if (ctx->restricted) { if (opcode >= IORING_REGISTER_LAST) return -EINVAL;
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