net: sched: Fix memory exposure from short TCA_U32_SEL

[ Upstream commit 98c8f125fd8a6240ea343c1aa50a1be9047791b8 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index ba37d8f57e68655d3e9e9b8c75967b1e36d09b8f..0c9bc29dcf97a599359038bfe4dd7e17e90ebc01 100644 (file)
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -903,6 +903,7 @@ 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;
@@ -1024,8 +1025,11 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
                return -EINVAL;
 
        s = nla_data(tb[TCA_U32_SEL]);
+       sel_size = sizeof(*s) + sizeof(*s->keys) * s->nkeys;
+       if (nla_len(tb[TCA_U32_SEL]) < sel_size)
+               return -EINVAL;
 
-       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)
                return -ENOBUFS;
 
@@ -1038,7 +1042,7 @@ 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;