diff options
| author | Nikolay Aleksandrov <nikolay@cumulusnetworks.com> | 2017-10-03 12:20:48 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-10-03 19:18:00 +0200 |
| commit | ce024f42c2e28b6bce4ecc1e891b42f57f753892 (patch) | |
| tree | a1409a700a40b3e4f0ab0dd5acf5df5808366897 /net | |
| parent | socket, bpf: fix possible use after free (diff) | |
| download | linux-ce024f42c2e28b6bce4ecc1e891b42f57f753892.tar.xz linux-ce024f42c2e28b6bce4ecc1e891b42f57f753892.zip | |
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.c | 3 |
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; |