This is a note to let you know that I've just added the patch titled
net: socket: error on a negative msg_namelen
to the 3.4-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-socket-error-on-a-negative-msg_namelen.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Apr 14 15:32:12 PDT 2014
From: Matthew Leach <matthew.leach@xxxxxxx>
Date: Tue, 11 Mar 2014 11:58:27 +0000
Subject: net: socket: error on a negative msg_namelen
From: Matthew Leach <matthew.leach@xxxxxxx>
[ Upstream commit dbb490b96584d4e958533fb637f08b557f505657 ]
When copying in a struct msghdr from the user, if the user has set the
msg_namelen parameter to a negative value it gets clamped to a valid
size due to a comparison between signed and unsigned values.
Ensure the syscall errors when the user passes in a negative value.
Signed-off-by: Matthew Leach <matthew.leach@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/socket.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/net/socket.c
+++ b/net/socket.c
@@ -1907,6 +1907,10 @@ static int copy_msghdr_from_user(struct
{
if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
return -EFAULT;
+
+ if (kmsg->msg_namelen < 0)
+ return -EINVAL;
+
if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
kmsg->msg_namelen = sizeof(struct sockaddr_storage);
return 0;
Patches currently in stable-queue which might be from matthew.leach@xxxxxxx are
queue-3.4/net-socket-error-on-a-negative-msg_namelen.patch
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