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Subject[PATCH 5.3 027/344] net_sched: add policy validation for action attributes
Date
From: Cong Wang <xiyou.wangcong@gmail.com>

[ Upstream commit 199ce850ce112315cfc68d42b694bcaa27b097b7 ]

Similar to commit 8b4c3cdd9dd8
("net: sched: Add policy validation for tc attributes"), we need
to add proper policy validation for TC action attributes too.

Cc: David Ahern <dsahern@gmail.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/sched/act_api.c | 34 ++++++++++++++++++----------------
1 file changed, 18 insertions(+), 16 deletions(-)

--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -831,6 +831,15 @@ static struct tc_cookie *nla_memdup_cook
return c;
}

+static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = {
+ [TCA_ACT_KIND] = { .type = NLA_NUL_STRING,
+ .len = IFNAMSIZ - 1 },
+ [TCA_ACT_INDEX] = { .type = NLA_U32 },
+ [TCA_ACT_COOKIE] = { .type = NLA_BINARY,
+ .len = TC_COOKIE_MAX_SIZE },
+ [TCA_ACT_OPTIONS] = { .type = NLA_NESTED },
+};
+
struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
struct nlattr *nla, struct nlattr *est,
char *name, int ovr, int bind,
@@ -846,8 +855,8 @@ struct tc_action *tcf_action_init_1(stru
int err;

if (name == NULL) {
- err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, NULL,
- extack);
+ err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
+ tcf_action_policy, extack);
if (err < 0)
goto err_out;
err = -EINVAL;
@@ -856,18 +865,9 @@ struct tc_action *tcf_action_init_1(stru
NL_SET_ERR_MSG(extack, "TC action kind must be specified");
goto err_out;
}
- if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) {
- NL_SET_ERR_MSG(extack, "TC action name too long");
- goto err_out;
- }
- if (tb[TCA_ACT_COOKIE]) {
- int cklen = nla_len(tb[TCA_ACT_COOKIE]);
-
- if (cklen > TC_COOKIE_MAX_SIZE) {
- NL_SET_ERR_MSG(extack, "TC cookie size above the maximum");
- goto err_out;
- }
+ nla_strlcpy(act_name, kind, IFNAMSIZ);

+ if (tb[TCA_ACT_COOKIE]) {
cookie = nla_memdup_cookie(tb);
if (!cookie) {
NL_SET_ERR_MSG(extack, "No memory to generate TC cookie");
@@ -1098,7 +1098,8 @@ static struct tc_action *tcf_action_get_
int index;
int err;

- err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, NULL, extack);
+ err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
+ tcf_action_policy, extack);
if (err < 0)
goto err_out;

@@ -1152,7 +1153,8 @@ static int tca_action_flush(struct net *

b = skb_tail_pointer(skb);

- err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla, NULL, extack);
+ err = nla_parse_nested_deprecated(tb, TCA_ACT_MAX, nla,
+ tcf_action_policy, extack);
if (err < 0)
goto err_out;

@@ -1440,7 +1442,7 @@ static struct nlattr *find_dump_kind(str

if (tb[1] == NULL)
return NULL;
- if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], NULL, NULL) < 0)
+ if (nla_parse_nested_deprecated(tb2, TCA_ACT_MAX, tb[1], tcf_action_policy, NULL) < 0)
return NULL;
kind = tb2[TCA_ACT_KIND];


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