Commit 9420e955 authored by Eric Dumazet's avatar Eric Dumazet Committed by Ben Hutchings

netfilter: xt_socket: fix a stack corruption bug

commit 78296c97 upstream.

As soon as extract_icmp6_fields() returns, its local storage (automatic
variables) is deallocated and can be overwritten.

Lets add an additional parameter to make sure storage is valid long
enough.

While we are at it, adds some const qualifiers.
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Fixes: b64c9256 ("tproxy: added IPv6 support to the socket match")
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 1e5bf5ca
......@@ -205,12 +205,13 @@ static int
extract_icmp6_fields(const struct sk_buff *skb,
unsigned int outside_hdrlen,
int *protocol,
struct in6_addr **raddr,
struct in6_addr **laddr,
const struct in6_addr **raddr,
const struct in6_addr **laddr,
__be16 *rport,
__be16 *lport)
__be16 *lport,
struct ipv6hdr *ipv6_var)
{
struct ipv6hdr *inside_iph, _inside_iph;
const struct ipv6hdr *inside_iph;
struct icmp6hdr *icmph, _icmph;
__be16 *ports, _ports[2];
u8 inside_nexthdr;
......@@ -224,12 +225,15 @@ extract_icmp6_fields(const struct sk_buff *skb,
if (icmph->icmp6_type & ICMPV6_INFOMSG_MASK)
return 1;
inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph), sizeof(_inside_iph), &_inside_iph);
inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph),
sizeof(*ipv6_var), ipv6_var);
if (inside_iph == NULL)
return 1;
inside_nexthdr = inside_iph->nexthdr;
inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) + sizeof(_inside_iph), &inside_nexthdr);
inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) +
sizeof(*ipv6_var),
&inside_nexthdr);
if (inside_hdrlen < 0)
return 1; /* hjm: Packet has no/incomplete transport layer headers. */
......@@ -256,10 +260,10 @@ extract_icmp6_fields(const struct sk_buff *skb,
static bool
socket_mt6_v1(const struct sk_buff *skb, struct xt_action_param *par)
{
struct ipv6hdr *iph = ipv6_hdr(skb);
struct ipv6hdr ipv6_var, *iph = ipv6_hdr(skb);
struct udphdr _hdr, *hp = NULL;
struct sock *sk;
struct in6_addr *daddr, *saddr;
const struct in6_addr *daddr, *saddr;
__be16 dport, sport;
int thoff, tproto;
const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo;
......@@ -283,7 +287,7 @@ socket_mt6_v1(const struct sk_buff *skb, struct xt_action_param *par)
} else if (tproto == IPPROTO_ICMPV6) {
if (extract_icmp6_fields(skb, thoff, &tproto, &saddr, &daddr,
&sport, &dport))
&sport, &dport, &ipv6_var))
return false;
} else {
return false;
......
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