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net: sched: Add policy validation for tc attributes 

[ Upstream commit 8b4c3cdd9d ]

A number of TC attributes are processed without proper validation
(e.g., length checks). Add a tca policy for all input attributes and use
when invoking nlmsg_parse.

The 2 Fixes tags below cover the latest additions. The other attributes
are a string (KIND), nested attribute (OPTIONS which does seem to have
validation in most cases), for dumps only or a flag.

Fixes: 5bc1701881 ("net: sched: introduce multichain support for filters")
Fixes: d47a6b0e7c ("net: sched: introduce ingress/egress block index attributes for qdisc")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
David Ahern 2018-10-03 15:05:36 -07:00 committed by Greg Kroah-Hartman
parent 85ebbc5a25
commit d905742331
1 changed files with 18 additions and 4 deletions
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22
net/sched/sch_api.c
View File

@ -1216,6 +1216,16 @@ check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
* Delete/get qdisc.
*/
const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = {
[TCA_KIND] = { .type = NLA_STRING },
[TCA_OPTIONS] = { .type = NLA_NESTED },
[TCA_RATE] = { .type = NLA_BINARY,
.len = sizeof(struct tc_estimator) },
[TCA_STAB] = { .type = NLA_NESTED },
[TCA_DUMP_INVISIBLE] = { .type = NLA_FLAG },
[TCA_CHAIN] = { .type = NLA_U32 },
};
static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
struct netlink_ext_ack *extack)
{
@ -1232,7 +1242,8 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
return -EPERM;
err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack);
err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, rtm_tca_policy,
extack);
if (err < 0)
return err;
@ -1302,7 +1313,8 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
replay:
/* Reinit, just in case something touches this. */
err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack);
err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, rtm_tca_policy,
extack);
if (err < 0)
return err;
@ -1512,7 +1524,8 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
idx = 0;
ASSERT_RTNL();
err = nlmsg_parse(nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
err = nlmsg_parse(nlh, sizeof(*tcm), tca, TCA_MAX,
rtm_tca_policy, NULL);
if (err < 0)
return err;
@ -1729,7 +1742,8 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
return -EPERM;
err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack);
err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, rtm_tca_policy,
extack);
if (err < 0)
return err;