This is a note to let you know that I've just added the patch titled
net/tun: fix ioctl() based info leaks
to the 3.0-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-tun-fix-ioctl-based-info-leaks.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From d85ec052dc477d6b7d579cf454f18b0bf8a0de7a Mon Sep 17 00:00:00 2001
From: Mathias Krause <[email protected]>
Date: Sun, 29 Jul 2012 19:45:14 +0000
Subject: net/tun: fix ioctl() based info leaks
From: Mathias Krause <[email protected]>
[ Upstream commits a117dacde0288f3ec60b6e5bcedae8fa37ee0dfc
and 8bbb181308bc348e02bfdbebdedd4e4ec9d452ce ]
The tun module leaks up to 36 bytes of memory by not fully initializing
a structure located on the stack that gets copied to user memory by the
TUNGETIFF and SIOCGIFHWADDR ioctl()s.
Signed-off-by: Mathias Krause <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/tun.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1239,10 +1239,12 @@ static long __tun_chr_ioctl(struct file
int vnet_hdr_sz;
int ret;
- if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
+ if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) {
if (copy_from_user(&ifr, argp, ifreq_len))
return -EFAULT;
-
+ } else {
+ memset(&ifr, 0, sizeof(ifr));
+ }
if (cmd == TUNGETFEATURES) {
/* Currently this just means: "what IFF flags are valid?".
* This is needed because we never checked for invalid flags on
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/net-tun-fix-ioctl-based-info-leaks.patch
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