UPSTREAM: io_uring: ensure recv and recvmsg handle MSG_WAITALL correctly

commit 7ba89d2a upstream.

We currently don't attempt to get the full asked for length even if
MSG_WAITALL is set, if we get a partial receive. If we do see a partial
receive, then just note how many bytes we did and return -EAGAIN to
get it retried.

The iov is advanced appropriately for the vector based case, and we
manually bump the buffer and remainder for the non-vector case.

Cc: stable@vger.kernel.org
Reported-by: Constantine Gavrilov <constantine.gavrilov@gmail.com>
Change-Id: Ic855be831471c36f579c6e9025698a4b81f4e4b2
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 9b7b0f21)
Bug: 268174392
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>