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 fb861f90fde6610d7fa4f7b6908742b307a4b9d0..260749956ef329bdee3c702009606c5add32249f 100644 (file)
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -912,6 +912,7 @@ 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;
@@ -1074,8 +1075,13 @@ 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;
@@ -1090,7 +1096,7 @@ 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;