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netfilter: check if the socket netns is correct.

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Netfilter assumes that if the socket is present in the skb, then
it can be used because that reference is cleaned up while the skb
is crossing netns.

We want to change that to preserve the socket reference in a future
patch, so this is a preparation updating netfilter to check if the
socket netns matches before use it.

Signed-off-by: Flavio Leitner <fbl@redhat.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Flavio Leitner 2018-06-27 10:34:25 -03:00 committed by David S. Miller
parent 003504a23a
commit f564650106
12 changed files with 44 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/netfilter/nf_log.h
View File

@ -106,7 +106,8 @@ int nf_log_dump_udp_header(struct nf_log_buf *m, const struct sk_buff *skb,
int nf_log_dump_tcp_header(struct nf_log_buf *m, const struct sk_buff *skb, int nf_log_dump_tcp_header(struct nf_log_buf *m, const struct sk_buff *skb,
u8 proto, int fragment, unsigned int offset, u8 proto, int fragment, unsigned int offset,
unsigned int logflags); unsigned int logflags);
void nf_log_dump_sk_uid_gid(struct nf_log_buf *m, struct sock *sk); void nf_log_dump_sk_uid_gid(struct net *net, struct nf_log_buf *m,
struct sock *sk);
void nf_log_dump_packet_common(struct nf_log_buf *m, u_int8_t pf, void nf_log_dump_packet_common(struct nf_log_buf *m, u_int8_t pf,
unsigned int hooknum, const struct sk_buff *skb, unsigned int hooknum, const struct sk_buff *skb,
const struct net_device *in, const struct net_device *in,

8
net/ipv4/netfilter/nf_log_ipv4.c
View File

@ -35,7 +35,7 @@ static const struct nf_loginfo default_loginfo = {
}; };
/* One level of recursion won't kill us */ /* One level of recursion won't kill us */
static void dump_ipv4_packet(struct nf_log_buf *m, static void dump_ipv4_packet(struct net *net, struct nf_log_buf *m,
const struct nf_loginfo *info, const struct nf_loginfo *info,
const struct sk_buff *skb, unsigned int iphoff) const struct sk_buff *skb, unsigned int iphoff)
{ {
@ -183,7 +183,7 @@ static void dump_ipv4_packet(struct nf_log_buf *m,
/* Max length: 3+maxlen */ /* Max length: 3+maxlen */
if (!iphoff) { /* Only recurse once. */ if (!iphoff) { /* Only recurse once. */
nf_log_buf_add(m, "["); nf_log_buf_add(m, "[");
dump_ipv4_packet(m, info, skb, dump_ipv4_packet(net, m, info, skb,
iphoff + ih->ihl*4+sizeof(_icmph)); iphoff + ih->ihl*4+sizeof(_icmph));
nf_log_buf_add(m, "] "); nf_log_buf_add(m, "] ");
} }
@ -251,7 +251,7 @@ static void dump_ipv4_packet(struct nf_log_buf *m,
/* Max length: 15 "UID=4294967295 " */ /* Max length: 15 "UID=4294967295 " */
if ((logflags & NF_LOG_UID) && !iphoff) if ((logflags & NF_LOG_UID) && !iphoff)
nf_log_dump_sk_uid_gid(m, skb->sk); nf_log_dump_sk_uid_gid(net, m, skb->sk);
/* Max length: 16 "MARK=0xFFFFFFFF " */ /* Max length: 16 "MARK=0xFFFFFFFF " */
if (!iphoff && skb->mark) if (!iphoff && skb->mark)
@ -333,7 +333,7 @@ static void nf_log_ip_packet(struct net *net, u_int8_t pf,
if (in != NULL) if (in != NULL)
dump_ipv4_mac_header(m, loginfo, skb); dump_ipv4_mac_header(m, loginfo, skb);
dump_ipv4_packet(m, loginfo, skb, 0); dump_ipv4_packet(net, m, loginfo, skb, 0);
nf_log_buf_close(m); nf_log_buf_close(m);
} }

8
net/ipv6/netfilter/nf_log_ipv6.c
View File

@ -36,7 +36,7 @@ static const struct nf_loginfo default_loginfo = {
}; };
/* One level of recursion won't kill us */ /* One level of recursion won't kill us */
static void dump_ipv6_packet(struct nf_log_buf *m, static void dump_ipv6_packet(struct net *net, struct nf_log_buf *m,
const struct nf_loginfo *info, const struct nf_loginfo *info,
const struct sk_buff *skb, unsigned int ip6hoff, const struct sk_buff *skb, unsigned int ip6hoff,
int recurse) int recurse)
@ -258,7 +258,7 @@ static void dump_ipv6_packet(struct nf_log_buf *m,
/* Max length: 3+maxlen */ /* Max length: 3+maxlen */
if (recurse) { if (recurse) {
nf_log_buf_add(m, "["); nf_log_buf_add(m, "[");
dump_ipv6_packet(m, info, skb, dump_ipv6_packet(net, m, info, skb,
ptr + sizeof(_icmp6h), 0); ptr + sizeof(_icmp6h), 0);
nf_log_buf_add(m, "] "); nf_log_buf_add(m, "] ");
} }
@ -278,7 +278,7 @@ static void dump_ipv6_packet(struct nf_log_buf *m,
/* Max length: 15 "UID=4294967295 " */ /* Max length: 15 "UID=4294967295 " */
if ((logflags & NF_LOG_UID) && recurse) if ((logflags & NF_LOG_UID) && recurse)
nf_log_dump_sk_uid_gid(m, skb->sk); nf_log_dump_sk_uid_gid(net, m, skb->sk);
/* Max length: 16 "MARK=0xFFFFFFFF " */ /* Max length: 16 "MARK=0xFFFFFFFF " */
if (recurse && skb->mark) if (recurse && skb->mark)
@ -365,7 +365,7 @@ static void nf_log_ip6_packet(struct net *net, u_int8_t pf,
if (in != NULL) if (in != NULL)
dump_ipv6_mac_header(m, loginfo, skb); dump_ipv6_mac_header(m, loginfo, skb);
dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1); dump_ipv6_packet(net, m, loginfo, skb, skb_network_offset(skb), 1);
nf_log_buf_close(m); nf_log_buf_close(m);
} }

2
net/netfilter/nf_conntrack_broadcast.c
View File

@ -32,7 +32,7 @@ int nf_conntrack_broadcast_help(struct sk_buff *skb,
__be32 mask = 0; __be32 mask = 0;
/* we're only interested in locally generated packets */ /* we're only interested in locally generated packets */
if (skb->sk == NULL) if (skb->sk == NULL || !net_eq(nf_ct_net(ct), sock_net(skb->sk)))
goto out; goto out;
if (rt == NULL || !(rt->rt_flags & RTCF_BROADCAST)) if (rt == NULL || !(rt->rt_flags & RTCF_BROADCAST))
goto out; goto out;

5
net/netfilter/nf_log_common.c
View File

@ -132,9 +132,10 @@ int nf_log_dump_tcp_header(struct nf_log_buf *m, const struct sk_buff *skb,
} }
EXPORT_SYMBOL_GPL(nf_log_dump_tcp_header); EXPORT_SYMBOL_GPL(nf_log_dump_tcp_header);
void nf_log_dump_sk_uid_gid(struct nf_log_buf *m, struct sock *sk) void nf_log_dump_sk_uid_gid(struct net *net, struct nf_log_buf *m,
struct sock *sk)
{ {
if (!sk || !sk_fullsock(sk)) if (!sk || !sk_fullsock(sk) || !net_eq(net, sock_net(sk)))
return; return;
read_lock_bh(&sk->sk_callback_lock); read_lock_bh(&sk->sk_callback_lock);

6
net/netfilter/nf_nat_core.c
View File

@ -108,6 +108,7 @@ int nf_xfrm_me_harder(struct net *net, struct sk_buff *skb, unsigned int family)
struct flowi fl; struct flowi fl;
unsigned int hh_len; unsigned int hh_len;
struct dst_entry *dst; struct dst_entry *dst;
struct sock *sk = skb->sk;
int err; int err;
err = xfrm_decode_session(skb, &fl, family); err = xfrm_decode_session(skb, &fl, family);
@ -119,7 +120,10 @@ int nf_xfrm_me_harder(struct net *net, struct sk_buff *skb, unsigned int family)
dst = ((struct xfrm_dst *)dst)->route; dst = ((struct xfrm_dst *)dst)->route;
dst_hold(dst); dst_hold(dst);
dst = xfrm_lookup(net, dst, &fl, skb->sk, 0); if (sk && !net_eq(net, sock_net(sk)))
sk = NULL;
dst = xfrm_lookup(net, dst, &fl, sk, 0);
if (IS_ERR(dst)) if (IS_ERR(dst))
return PTR_ERR(dst); return PTR_ERR(dst);

9
net/netfilter/nft_meta.c
View File

@ -107,7 +107,8 @@ static void nft_meta_get_eval(const struct nft_expr *expr,
break; break;
case NFT_META_SKUID: case NFT_META_SKUID:
sk = skb_to_full_sk(skb); sk = skb_to_full_sk(skb);
if (!sk || !sk_fullsock(sk)) if (!sk || !sk_fullsock(sk) ||
!net_eq(nft_net(pkt), sock_net(sk)))
goto err; goto err;
read_lock_bh(&sk->sk_callback_lock); read_lock_bh(&sk->sk_callback_lock);
@ -123,7 +124,8 @@ static void nft_meta_get_eval(const struct nft_expr *expr,
break; break;
case NFT_META_SKGID: case NFT_META_SKGID:
sk = skb_to_full_sk(skb); sk = skb_to_full_sk(skb);
if (!sk || !sk_fullsock(sk)) if (!sk || !sk_fullsock(sk) ||
!net_eq(nft_net(pkt), sock_net(sk)))
goto err; goto err;
read_lock_bh(&sk->sk_callback_lock); read_lock_bh(&sk->sk_callback_lock);
@ -214,7 +216,8 @@ static void nft_meta_get_eval(const struct nft_expr *expr,
#ifdef CONFIG_CGROUP_NET_CLASSID #ifdef CONFIG_CGROUP_NET_CLASSID
case NFT_META_CGROUP: case NFT_META_CGROUP:
sk = skb_to_full_sk(skb); sk = skb_to_full_sk(skb);
if (!sk || !sk_fullsock(sk)) if (!sk || !sk_fullsock(sk) ||
!net_eq(nft_net(pkt), sock_net(sk)))
goto err; goto err;
*dest = sock_cgroup_classid(&sk->sk_cgrp_data); *dest = sock_cgroup_classid(&sk->sk_cgrp_data);
break; break;

5
net/netfilter/nft_socket.c
View File

@ -23,6 +23,9 @@ static void nft_socket_eval(const struct nft_expr *expr,
struct sock *sk = skb->sk; struct sock *sk = skb->sk;
u32 *dest = &regs->data[priv->dreg]; u32 *dest = &regs->data[priv->dreg];
if (sk && !net_eq(nft_net(pkt), sock_net(sk)))
sk = NULL;
if (!sk) if (!sk)
switch(nft_pf(pkt)) { switch(nft_pf(pkt)) {
case NFPROTO_IPV4: case NFPROTO_IPV4:
@ -39,7 +42,7 @@ static void nft_socket_eval(const struct nft_expr *expr,
return; return;
} }
if(!sk) { if (!sk) {
nft_reg_store8(dest, 0); nft_reg_store8(dest, 0);
return; return;
} }

6
net/netfilter/xt_cgroup.c
View File

@ -72,8 +72,9 @@ static bool
cgroup_mt_v0(const struct sk_buff *skb, struct xt_action_param *par) cgroup_mt_v0(const struct sk_buff *skb, struct xt_action_param *par)
{ {
const struct xt_cgroup_info_v0 *info = par->matchinfo; const struct xt_cgroup_info_v0 *info = par->matchinfo;
struct sock *sk = skb->sk;
if (skb->sk == NULL || !sk_fullsock(skb->sk)) if (!sk || !sk_fullsock(sk) || !net_eq(xt_net(par), sock_net(sk)))
return false; return false;
return (info->id == sock_cgroup_classid(&skb->sk->sk_cgrp_data)) ^ return (info->id == sock_cgroup_classid(&skb->sk->sk_cgrp_data)) ^
@ -85,8 +86,9 @@ static bool cgroup_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
const struct xt_cgroup_info_v1 *info = par->matchinfo; const struct xt_cgroup_info_v1 *info = par->matchinfo;
struct sock_cgroup_data *skcd = &skb->sk->sk_cgrp_data; struct sock_cgroup_data *skcd = &skb->sk->sk_cgrp_data;
struct cgroup *ancestor = info->priv; struct cgroup *ancestor = info->priv;
struct sock *sk = skb->sk;
if (!skb->sk || !sk_fullsock(skb->sk)) if (!sk || !sk_fullsock(sk) || !net_eq(xt_net(par), sock_net(sk)))
return false; return false;
if (ancestor) if (ancestor)

2
net/netfilter/xt_owner.c
View File

@ -67,7 +67,7 @@ owner_mt(const struct sk_buff *skb, struct xt_action_param *par)
struct sock *sk = skb_to_full_sk(skb); struct sock *sk = skb_to_full_sk(skb);
struct net *net = xt_net(par); struct net *net = xt_net(par);
if (sk == NULL || sk->sk_socket == NULL) if (!sk || !sk->sk_socket || !net_eq(net, sock_net(sk)))
return (info->match ^ info->invert) == 0; return (info->match ^ info->invert) == 0;
else if (info->match & info->invert & XT_OWNER_SOCKET) else if (info->match & info->invert & XT_OWNER_SOCKET)
/* /*

3
net/netfilter/xt_recent.c
View File

@ -265,7 +265,8 @@ recent_mt(const struct sk_buff *skb, struct xt_action_param *par)
} }
/* use TTL as seen before forwarding */ /* use TTL as seen before forwarding */
if (xt_out(par) != NULL && skb->sk == NULL) if (xt_out(par) != NULL &&
(!skb->sk || !net_eq(net, sock_net(skb->sk))))
ttl++; ttl++;
spin_lock_bh(&recent_lock); spin_lock_bh(&recent_lock);

8
net/netfilter/xt_socket.c
View File

@ -56,8 +56,12 @@ socket_match(const struct sk_buff *skb, struct xt_action_param *par,
struct sk_buff *pskb = (struct sk_buff *)skb; struct sk_buff *pskb = (struct sk_buff *)skb;
struct sock *sk = skb->sk; struct sock *sk = skb->sk;
if (!net_eq(xt_net(par), sock_net(sk)))
sk = NULL;
if (!sk) if (!sk)
sk = nf_sk_lookup_slow_v4(xt_net(par), skb, xt_in(par)); sk = nf_sk_lookup_slow_v4(xt_net(par), skb, xt_in(par));
if (sk) { if (sk) {
bool wildcard; bool wildcard;
bool transparent = true; bool transparent = true;
@ -113,8 +117,12 @@ socket_mt6_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
struct sk_buff *pskb = (struct sk_buff *)skb; struct sk_buff *pskb = (struct sk_buff *)skb;
struct sock *sk = skb->sk; struct sock *sk = skb->sk;
if (!net_eq(xt_net(par), sock_net(sk)))
sk = NULL;
if (!sk) if (!sk)
sk = nf_sk_lookup_slow_v6(xt_net(par), skb, xt_in(par)); sk = nf_sk_lookup_slow_v6(xt_net(par), skb, xt_in(par));
if (sk) { if (sk) {
bool wildcard; bool wildcard;
bool transparent = true; bool transparent = true;