linux-kernel - [PATCH 3.16 095/134] Bluetooth: Fix user channel for 32bit userspace on 64bit kernel

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Message-ID: <lsq.1503062000.832269062@decadent.org.uk>
Date:   Fri, 18 Aug 2017 14:13:20 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Marcel Holtmann" <marcel@...tmann.org>,
        "Marko Kiiskila" <marko@...time.io>,
        "Szymon Janc" <szymon.janc@...ecoup.pl>
Subject: [PATCH 3.16 095/134] Bluetooth: Fix user channel for 32bit
 userspace on 64bit kernel

3.16.47-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Szymon Janc <szymon.janc@...ecoup.pl>

commit ab89f0bdd63a3721f7cd3f064f39fc4ac7ca14d4 upstream.

Running 32bit userspace on 64bit kernel results in MSG_CMSG_COMPAT being
defined as 0x80000000. This results in sendmsg failure if used from 32bit
userspace running on 64bit kernel. Fix this by accounting for MSG_CMSG_COMPAT
in flags check in hci_sock_sendmsg.

Signed-off-by: Szymon Janc <szymon.janc@...ecoup.pl>
Signed-off-by: Marko Kiiskila <marko@...time.io>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/bluetooth/hci_sock.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -886,7 +886,8 @@ static int hci_sock_sendmsg(struct kiocb
 	if (msg->msg_flags & MSG_OOB)
 		return -EOPNOTSUPP;
 
-	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
+	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE|
+			       MSG_CMSG_COMPAT))
 		return -EINVAL;
 
 	if (len < 4 || len > HCI_MAX_FRAME_SIZE)