This is a note to let you know that I've just added the patch titled
net: clamp ->msg_namelen instead of returning an error
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-clamp-msg_namelen-instead-of-returning-an-error.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 0cd7168f61e9fca226bcc1052463995348ff4e3d Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Wed, 27 Nov 2013 15:40:21 +0300
Subject: net: clamp ->msg_namelen instead of returning an error
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
[ Upstream commit db31c55a6fb245fdbb752a2ca4aefec89afabb06 ]
If kmsg->msg_namelen > sizeof(struct sockaddr_storage) then in the
original code that would lead to memory corruption in the kernel if you
had audit configured. If you didn't have audit configured it was
harmless.
There are some programs such as beta versions of Ruby which use too
large of a buffer and returning an error code breaks them. We should
clamp the ->msg_namelen value instead.
Fixes: 1661bf364ae9 ("net: heap overflow in __audit_sockaddr()")
Reported-by: Eric Wong <normalperson@xxxxxxxx>
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Tested-by: Eric Wong <normalperson@xxxxxxxx>
Acked-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/compat.c | 2 +-
net/socket.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/net/compat.c
+++ b/net/compat.c
@@ -72,7 +72,7 @@ int get_compat_msghdr(struct msghdr *kms
__get_user(kmsg->msg_flags, &umsg->msg_flags))
return -EFAULT;
if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
- return -EINVAL;
+ kmsg->msg_namelen = sizeof(struct sockaddr_storage);
kmsg->msg_name = compat_ptr(tmp1);
kmsg->msg_iov = compat_ptr(tmp2);
kmsg->msg_control = compat_ptr(tmp3);
--- a/net/socket.c
+++ b/net/socket.c
@@ -1908,7 +1908,7 @@ static int copy_msghdr_from_user(struct
if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
return -EFAULT;
if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
- return -EINVAL;
+ kmsg->msg_namelen = sizeof(struct sockaddr_storage);
return 0;
}
Patches currently in stable-queue which might be from dan.carpenter@xxxxxxxxxx are
queue-3.4/net-clamp-msg_namelen-instead-of-returning-an-error.patch
queue-3.4/isdnloop-use-strlcpy-instead-of-strcpy.patch
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