io_uring: limit registration w/ SINGLE_ISSUER
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: 97bbdc06a4
("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>
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@ -3890,6 +3890,9 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
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if (WARN_ON_ONCE(percpu_ref_is_dying(&ctx->refs)))
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if (WARN_ON_ONCE(percpu_ref_is_dying(&ctx->refs)))
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return -ENXIO;
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return -ENXIO;
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if (ctx->submitter_task && ctx->submitter_task != current)
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return -EEXIST;
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if (ctx->restricted) {
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if (ctx->restricted) {
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if (opcode >= IORING_REGISTER_LAST)
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if (opcode >= IORING_REGISTER_LAST)
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return -EINVAL;
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return -EINVAL;
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