This is a note to let you know that I've just added the patch titled
audit: use nlmsg_len() to get message payload length
to the 3.12-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:
audit-use-nlmsg_len-to-get-message-payload-length.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4d8fe7376a12bf4524783dd95cbc00f1fece6232 Mon Sep 17 00:00:00 2001
From: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Date: Mon, 30 Sep 2013 22:04:25 +0200
Subject: audit: use nlmsg_len() to get message payload length
From: Mathias Krause <minipli@xxxxxxxxxxxxxx>
commit 4d8fe7376a12bf4524783dd95cbc00f1fece6232 upstream.
Using the nlmsg_len member of the netlink header to test if the message
is valid is wrong as it includes the size of the netlink header itself.
Thereby allowing to send short netlink messages that pass those checks.
Use nlmsg_len() instead to test for the right message length. The result
of nlmsg_len() is guaranteed to be non-negative as the netlink message
already passed the checks of nlmsg_ok().
Also switch to min_t() to please checkpatch.pl.
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Eric Paris <eparis@xxxxxxxxxx>
Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Signed-off-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
Signed-off-by: Eric Paris <eparis@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/audit.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -670,7 +670,7 @@ static int audit_receive_msg(struct sk_b
&status_set, sizeof(status_set));
break;
case AUDIT_SET:
- if (nlh->nlmsg_len < sizeof(struct audit_status))
+ if (nlmsg_len(nlh) < sizeof(struct audit_status))
return -EINVAL;
status_get = (struct audit_status *)data;
if (status_get->mask & AUDIT_STATUS_ENABLED) {
@@ -832,7 +832,7 @@ static int audit_receive_msg(struct sk_b
memset(&s, 0, sizeof(s));
/* guard against past and future API changes */
- memcpy(&s, data, min(sizeof(s), (size_t)nlh->nlmsg_len));
+ memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh)));
if ((s.enabled != 0 && s.enabled != 1) ||
(s.log_passwd != 0 && s.log_passwd != 1))
return -EINVAL;
Patches currently in stable-queue which might be from minipli@xxxxxxxxxxxxxx are
queue-3.12/ipc-msg-fix-message-length-check-for-negative-values.patch
queue-3.12/audit-fix-info-leak-in-audit_get-requests.patch
queue-3.12/audit-use-nlmsg_len-to-get-message-payload-length.patch
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