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authorJakub Kicinski <jakub.kicinski@netronome.com>2019-01-18 10:46:21 -0800
committerDavid S. Miller <davem@davemloft.net>2019-01-19 10:09:58 -0800
commit4b1373de73a3a3a4d1b95b4995db4258cf268639 (patch)
treeacb432307f06e183f8ede3c95a5e8c9e84971ec6 /net/ipv6
parentd0440029831bcb21ceb89a3dbcadc7d6dca0a39a (diff)
downloadlinux-stericsson-4b1373de73a3a3a4d1b95b4995db4258cf268639.tar.gz
net: ipv6: addr: perform strict checks also for doit handlers
Make RTM_GETADDR's doit handler use strict checks when NETLINK_F_STRICT_CHK is set. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/addrconf.c49
1 files changed, 47 insertions, 2 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 93d5ad2b1a69..339a82cfe5f2 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5179,6 +5179,52 @@ static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
return inet6_dump_addr(skb, cb, type);
}
+static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ struct nlattr **tb,
+ struct netlink_ext_ack *extack)
+{
+ struct ifaddrmsg *ifm;
+ int i, err;
+
+ if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
+ NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
+ return -EINVAL;
+ }
+
+ ifm = nlmsg_data(nlh);
+ if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
+ NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
+ return -EINVAL;
+ }
+
+ if (!netlink_strict_get_check(skb))
+ return nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX,
+ ifa_ipv6_policy, extack);
+
+ err = nlmsg_parse_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
+ ifa_ipv6_policy, extack);
+ if (err)
+ return err;
+
+ for (i = 0; i <= IFA_MAX; i++) {
+ if (!tb[i])
+ continue;
+
+ switch (i) {
+ case IFA_TARGET_NETNSID:
+ case IFA_ADDRESS:
+ case IFA_LOCAL:
+ break;
+ default:
+ NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
@@ -5199,8 +5245,7 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct sk_buff *skb;
int err;
- err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
- extack);
+ err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
if (err < 0)
return err;