From: David Lamparter <equinox@xxxxxxxxxx> 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@xxxxxxxxxxxxxxx # v5.10+ Signed-off-by: David Lamparter <equinox@xxxxxxxxxx> Cc: Eric Dumazet <edumazet@xxxxxxxxxx> Cc: Jens Axboe <axboe@xxxxxxxxx> Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx> Link: https://lore.kernel.org/r/20230224150123.128346-1-equinox@xxxxxxxxxx Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- io_uring/net.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/io_uring/net.c +++ b/io_uring/net.c @@ -553,7 +553,7 @@ int io_recvmsg_prep(struct io_kiocb *req 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)
