This is a note to let you know that I've just added the patch titled
rtnl: stats - add missing netlink message size checks
to the 4.9-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:
rtnl-stats-add-missing-netlink-message-size-checks.patch
and it can be found in the queue-4.9 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 Thu Jan 12 21:37:26 CET 2017
From: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Date: Wed, 28 Dec 2016 17:52:15 +0100
Subject: rtnl: stats - add missing netlink message size checks
From: Mathias Krause <minipli@xxxxxxxxxxxxxx>
[ Upstream commit 4775cc1f2d5abca894ac32774eefc22c45347d1c ]
We miss to check if the netlink message is actually big enough to contain
a struct if_stats_msg.
Add a check to prevent userland from sending us short messages that would
make us access memory beyond the end of the message.
Fixes: 10c9ead9f3c6 ("rtnetlink: add new RTM_GETSTATS message to dump...")
Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Cc: Roopa Prabhu <roopa@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/core/rtnetlink.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3886,6 +3886,9 @@ static int rtnl_stats_get(struct sk_buff
u32 filter_mask;
int err;
+ if (nlmsg_len(nlh) < sizeof(*ifsm))
+ return -EINVAL;
+
ifsm = nlmsg_data(nlh);
if (ifsm->ifindex > 0)
dev = __dev_get_by_index(net, ifsm->ifindex);
@@ -3935,6 +3938,9 @@ static int rtnl_stats_dump(struct sk_buf
cb->seq = net->dev_base_seq;
+ if (nlmsg_len(cb->nlh) < sizeof(*ifsm))
+ return -EINVAL;
+
ifsm = nlmsg_data(cb->nlh);
filter_mask = ifsm->filter_mask;
if (!filter_mask)
Patches currently in stable-queue which might be from minipli@xxxxxxxxxxxxxx are
queue-4.9/rtnl-stats-add-missing-netlink-message-size-checks.patch
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