netdev - [PATCHSET 0/2] Disallow ancillary data from __sys_{recv,send}msg

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Date:   Mon, 25 Nov 2019 18:31:43 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net
Subject: [PATCHSET 0/2] Disallow ancillary data from __sys_{recv,send}msg_file()

io_uring currently uses __sys_sendmsg_file() and __sys_recvmsg_file() to
handle sendmsg and recvmsg operations. This generally works fine, but we
don't want to allow cmsg type operations, just "normal" data transfers.

This small patchset first splits the msghdr copy from the two main
helpers in net/socket.c, then changes __sys_sendmsg_file() and
__sys_recvmsg_file() to use those helpers. With patch 2, we also add a
check to explicitly check for msghdr->msg_control and
msghdr->msg_controllen and return -EINVAL if they are set.

 net/socket.c | 184 ++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 132 insertions(+), 52 deletions(-)

-- 
Jens Axboe