This is a note to let you know that I've just added the patch titled
net: initialize msg.msg_flags in recvfrom
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: net-initialize-msg.msg_flags-in-recvfrom.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Mon Dec 18 14:12:34 CET 2017
From: Alexander Potapenko glider@google.com Date: Wed, 8 Mar 2017 18:08:16 +0100 Subject: net: initialize msg.msg_flags in recvfrom
From: Alexander Potapenko glider@google.com
[ Upstream commit 9f138fa609c47403374a862a08a41394be53d461 ]
KMSAN reports a use of uninitialized memory in put_cmsg() because msg.msg_flags in recvfrom haven't been initialized properly. The flag values don't affect the result on this path, but it's still a good idea to initialize them explicitly.
Signed-off-by: Alexander Potapenko glider@google.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/socket.c | 1 + 1 file changed, 1 insertion(+)
--- a/net/socket.c +++ b/net/socket.c @@ -1702,6 +1702,7 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void /* We assume all kernel code knows the size of sockaddr_storage */ msg.msg_namelen = 0; msg.msg_iocb = NULL; + msg.msg_flags = 0; if (sock->file->f_flags & O_NONBLOCK) flags |= MSG_DONTWAIT; err = sock_recvmsg(sock, &msg, flags);
Patches currently in stable-queue which might be from glider@google.com are
queue-4.9/net-initialize-msg.msg_flags-in-recvfrom.patch