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io_uring: fix 32-bit compatability with sendmsg/recvmsg

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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: aa1fa28fc7 ("io_uring: add support for recvmsg()")
Fixes: 0fa03c624d ("io_uring: add support for sendmsg()")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2020-02-27 14:17:49 -07:00 • committed by Greg Kroah-Hartman
commit 7eaf718b83
1 changed files with 5 additions and 0 deletions
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5
fs/io_uring.c
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@ -1657,6 +1657,11 @@ static int io_send_recvmsg(struct io_kiocb *req, const struct io_uring_sqe *sqe,
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);