From f0c6b2b4efc1578b0bd5e86d04d5c802e6d2100e Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 27 Feb 2020 14:17:49 -0700 Subject: [PATCH] io_uring: fix 32-bit compatability with sendmsg/recvmsg 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@vger.kernel.org Fixes: aa1fa28fc73e ("io_uring: add support for recvmsg()") Fixes: 0fa03c624d8f ("io_uring: add support for sendmsg()") Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- fs/io_uring.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/fs/io_uring.c b/fs/io_uring.c index de4bd647cd1df..60a4832089982 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2166,6 +2166,11 @@ static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) sr->msg_flags = READ_ONCE(sqe->msg_flags); sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); +#ifdef CONFIG_COMPAT + if (req->ctx->compat) + sr->msg_flags |= MSG_CMSG_COMPAT; +#endif + if (!io) return 0; @@ -2258,6 +2263,11 @@ static int io_recvmsg_prep(struct io_kiocb *req, sr->msg_flags = READ_ONCE(sqe->msg_flags); sr->msg = u64_to_user_ptr(READ_ONCE(sqe->addr)); +#ifdef CONFIG_COMPAT + if (req->ctx->compat) + sr->msg_flags |= MSG_CMSG_COMPAT; +#endif + if (!io) return 0; -- 2.47.3