This is a note to let you know that I've just added the patch titled
tools: hv: Netlink source address validation allows DoS
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:
tools-hv-netlink-source-address-validation-allows-dos.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 95a69adab9acfc3981c504737a2b6578e4d846ef Mon Sep 17 00:00:00 2001
From: Tomas Hozza <thozza@xxxxxxxxxx>
Date: Thu, 8 Nov 2012 10:53:29 +0100
Subject: tools: hv: Netlink source address validation allows DoS
From: Tomas Hozza <thozza@xxxxxxxxxx>
commit 95a69adab9acfc3981c504737a2b6578e4d846ef upstream.
The source code without this patch caused hypervkvpd to exit when it processed
a spoofed Netlink packet which has been sent from an untrusted local user.
Now Netlink messages with a non-zero nl_pid source address are ignored
and a warning is printed into the syslog.
Signed-off-by: Tomas Hozza <thozza@xxxxxxxxxx>
Acked-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/hv/hv_kvp_daemon.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -727,13 +727,19 @@ int main(void)
len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
addr_p, &addr_l);
- if (len < 0 || addr.nl_pid) {
+ if (len < 0) {
syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
addr.nl_pid, errno, strerror(errno));
close(fd);
return -1;
}
+ if (addr.nl_pid) {
+ syslog(LOG_WARNING, "Received packet from untrusted pid:%u",
+ addr.nl_pid);
+ continue;
+ }
+
incoming_msg = (struct nlmsghdr *)kvp_recv_buffer;
incoming_cn_msg = (struct cn_msg *)NLMSG_DATA(incoming_msg);
hv_msg = (struct hv_kvp_msg *)incoming_cn_msg->data;
Patches currently in stable-queue which might be from thozza@xxxxxxxxxx are
queue-3.4/tools-hv-netlink-source-address-validation-allows-dos.patch
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