From: Jens Axboe <axboe@xxxxxxxxx> commit d876836204897b6d7d911f942084f69a1e9d5c4d upstream. We must set MSG_CMSG_COMPAT if we're in compatability mode, otherwise the iovec import for these commands will not do the right thing and fail the command with -EINVAL. Found by running the test suite compiled as 32-bit. Cc: stable@xxxxxxxxxxxxxxx Fixes: aa1fa28fc73e ("io_uring: add support for recvmsg()") Fixes: 0fa03c624d8f ("io_uring: add support for sendmsg()") Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/io_uring.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1657,6 +1657,11 @@ static int io_send_recvmsg(struct io_kio else if (force_nonblock) flags |= MSG_DONTWAIT; +#ifdef CONFIG_COMPAT + if (req->ctx->compat) + flags |= MSG_CMSG_COMPAT; +#endif + msg = (struct user_msghdr __user *) (unsigned long) READ_ONCE(sqe->addr);