io_uring: remove MSG_NOSIGNAL from recvmsg

commit 7605c43d67face310b4b87dee1a28bc0c8cd8c0f upstream.

MSG_NOSIGNAL is not applicable for the receiving side, SIGPIPE is
generated when trying to write to a "broken pipe".  AF_PACKET's
packet_recvmsg() does enforce this, giving back EINVAL when MSG_NOSIGNAL
is set - making it unuseable in io_uring's recvmsg.

Remove MSG_NOSIGNAL from io_recvmsg_prep().

Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: David Lamparter <equinox@diac24.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20230224150123.128346-1-equinox@diac24.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/io_uring/net.c b/io_uring/net.c
index 520a73b..55d822b 100644 (file)
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -553,7 +553,7 @@ int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
        sr->flags = READ_ONCE(sqe->ioprio);
        if (sr->flags & ~(RECVMSG_FLAGS))
                return -EINVAL;
-       sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
+       sr->msg_flags = READ_ONCE(sqe->msg_flags);
        if (sr->msg_flags & MSG_DONTWAIT)
                req->flags |= REQ_F_NOWAIT;
        if (sr->msg_flags & MSG_ERRQUEUE)