* Patch "net: initialize msg.msg_flags in recvfrom" has been added to the 4.9-stable tree
@ 2017-12-18 13:21 gregkh
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From: gregkh @ 2017-12-18 13:21 UTC (permalink / raw)
To: glider, alexander.levin, davem, gregkh; +Cc: stable, stable-commits
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;a=summary
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
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2017-12-18 13:21 Patch "net: initialize msg.msg_flags in recvfrom" has been added to the 4.9-stable tree gregkh
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