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authorNikolay Aleksandrov <nikolay@cumulusnetworks.com>2017-10-03 13:20:48 +0300
committerDavid S. Miller <davem@davemloft.net>2017-10-03 10:18:00 -0700
commitce024f42c2e28b6bce4ecc1e891b42f57f753892 (patch)
treea1409a700a40b3e4f0ab0dd5acf5df5808366897 /net
parenteefca20eb20c66b06cf5ed09b49b1a7caaa27b7b (diff)
net: rtnetlink: fix info leak in RTM_GETSTATS call
When RTM_GETSTATS was added the fields of its header struct were not all initialized when returning the result thus leaking 4 bytes of information to user-space per rtnl_fill_statsinfo call, so initialize them now. Thanks to Alexander Potapenko for the detailed report and bisection. Reported-by: Alexander Potapenko <glider@google.com> Fixes: 10c9ead9f3c6 ("rtnetlink: add new RTM_GETSTATS message to dump link stats") Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/rtnetlink.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index a78fd61da0ec..d4bcdcc68e92 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3854,6 +3854,9 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
return -EMSGSIZE;
ifsm = nlmsg_data(nlh);
+ ifsm->family = PF_UNSPEC;
+ ifsm->pad1 = 0;
+ ifsm->pad2 = 0;
ifsm->ifindex = dev->ifindex;
ifsm->filter_mask = filter_mask;