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    Subject[PATCH 6.0 017/862] io_uring: limit registration w/ SINGLE_ISSUER
    Date
    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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