net: sched: Fix memory exposure from short TCA_U32_SEL

Via u32_change(), TCA_U32_SEL has an unspecified type in the netlink
policy, so max length isn't enforced, only minimum. This means nkeys
(from userspace) was being trusted without checking the actual size of
nla_len(), which could lead to a memory over-read, and ultimately an
exposure via a call to u32_dump(). Reachability is CAP_NET_ADMIN within
a namespace.

Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index d5d2a6dc39216b0ca28bd11094f0b64fda5c5964..f218ccf1e2d9a651ad07c2a6276742b97d3b2102 100644 (file)
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -914,6 +914,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
        struct nlattr *opt = tca[TCA_OPTIONS];
        struct nlattr *tb[TCA_U32_MAX + 1];
        u32 htid, flags = 0;
+       size_t sel_size;
        int err;
 #ifdef CONFIG_CLS_U32_PERF
        size_t size;
@@ -1076,8 +1077,13 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
        }
 
        s = nla_data(tb[TCA_U32_SEL]);
+       sel_size = struct_size(s, keys, s->nkeys);
+       if (nla_len(tb[TCA_U32_SEL]) < sel_size) {
+               err = -EINVAL;
+               goto erridr;
+       }
 
-       n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
+       n = kzalloc(offsetof(typeof(*n), sel) + sel_size, GFP_KERNEL);
        if (n == NULL) {
                err = -ENOBUFS;
                goto erridr;
@@ -1092,7 +1098,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
        }
 #endif
 
-       memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
+       memcpy(&n->sel, s, sel_size);
        RCU_INIT_POINTER(n->ht_up, ht);
        n->handle = handle;
        n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;