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Message-Id: <20210806151149.6356-2-pablo@netfilter.org>
Date: Fri, 6 Aug 2021 17:11:41 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Subject: [PATCH net 1/9] netfilter: ipset: Limit the maximal range of consecutive elements to add/delete
From: Jozsef Kadlecsik <kadlec@...filter.org>
The range size of consecutive elements were not limited. Thus one could
define a huge range which may result soft lockup errors due to the long
execution time. Now the range size is limited to 2^20 entries.
Reported-by: Brad Spengler <spender@...ecurity.net>
Signed-off-by: Jozsef Kadlecsik <kadlec@...filter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/linux/netfilter/ipset/ip_set.h | 3 +++
net/netfilter/ipset/ip_set_hash_ip.c | 9 ++++++++-
net/netfilter/ipset/ip_set_hash_ipmark.c | 10 +++++++++-
net/netfilter/ipset/ip_set_hash_ipport.c | 3 +++
net/netfilter/ipset/ip_set_hash_ipportip.c | 3 +++
net/netfilter/ipset/ip_set_hash_ipportnet.c | 3 +++
net/netfilter/ipset/ip_set_hash_net.c | 11 ++++++++++-
net/netfilter/ipset/ip_set_hash_netiface.c | 10 +++++++++-
net/netfilter/ipset/ip_set_hash_netnet.c | 16 +++++++++++++++-
net/netfilter/ipset/ip_set_hash_netport.c | 11 ++++++++++-
net/netfilter/ipset/ip_set_hash_netportnet.c | 16 +++++++++++++++-
11 files changed, 88 insertions(+), 7 deletions(-)
diff --git a/include/linux/netfilter/ipset/ip_set.h b/include/linux/netfilter/ipset/ip_set.h
index 10279c4830ac..ada1296c87d5 100644
--- a/include/linux/netfilter/ipset/ip_set.h
+++ b/include/linux/netfilter/ipset/ip_set.h
@@ -196,6 +196,9 @@ struct ip_set_region {
u32 elements; /* Number of elements vs timeout */
};
+/* Max range where every element is added/deleted in one step */
+#define IPSET_MAX_RANGE (1<<20)
+
/* The max revision number supported by any set type + 1 */
#define IPSET_REVISION_MAX 9
diff --git a/net/netfilter/ipset/ip_set_hash_ip.c b/net/netfilter/ipset/ip_set_hash_ip.c
index d1bef23fd4f5..dd30c03d5a23 100644
--- a/net/netfilter/ipset/ip_set_hash_ip.c
+++ b/net/netfilter/ipset/ip_set_hash_ip.c
@@ -132,8 +132,11 @@ hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
if (ret)
return ret;
- if (ip > ip_to)
+ if (ip > ip_to) {
+ if (ip_to == 0)
+ return -IPSET_ERR_HASH_ELEM;
swap(ip, ip_to);
+ }
} else if (tb[IPSET_ATTR_CIDR]) {
u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
@@ -144,6 +147,10 @@ hash_ip4_uadt(struct ip_set *set, struct nlattr *tb[],
hosts = h->netmask == 32 ? 1 : 2 << (32 - h->netmask - 1);
+ /* 64bit division is not allowed on 32bit */
+ if (((u64)ip_to - ip + 1) >> (32 - h->netmask) > IPSET_MAX_RANGE)
+ return -ERANGE;
+
if (retried) {
ip = ntohl(h->next.ip);
e.ip = htonl(ip);
diff --git a/net/netfilter/ipset/ip_set_hash_ipmark.c b/net/netfilter/ipset/ip_set_hash_ipmark.c
index 18346d18aa16..153de3457423 100644
--- a/net/netfilter/ipset/ip_set_hash_ipmark.c
+++ b/net/netfilter/ipset/ip_set_hash_ipmark.c
@@ -121,6 +121,8 @@ hash_ipmark4_uadt(struct ip_set *set, struct nlattr *tb[],
e.mark = ntohl(nla_get_be32(tb[IPSET_ATTR_MARK]));
e.mark &= h->markmask;
+ if (e.mark == 0 && e.ip == 0)
+ return -IPSET_ERR_HASH_ELEM;
if (adt == IPSET_TEST ||
!(tb[IPSET_ATTR_IP_TO] || tb[IPSET_ATTR_CIDR])) {
@@ -133,8 +135,11 @@ hash_ipmark4_uadt(struct ip_set *set, struct nlattr *tb[],
ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
if (ret)
return ret;
- if (ip > ip_to)
+ if (ip > ip_to) {
+ if (e.mark == 0 && ip_to == 0)
+ return -IPSET_ERR_HASH_ELEM;
swap(ip, ip_to);
+ }
} else if (tb[IPSET_ATTR_CIDR]) {
u8 cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
@@ -143,6 +148,9 @@ hash_ipmark4_uadt(struct ip_set *set, struct nlattr *tb[],
ip_set_mask_from_to(ip, ip_to, cidr);
}
+ if (((u64)ip_to - ip + 1) > IPSET_MAX_RANGE)
+ return -ERANGE;
+
if (retried)
ip = ntohl(h->next.ip);
for (; ip <= ip_to; ip++) {
diff --git a/net/netfilter/ipset/ip_set_hash_ipport.c b/net/netfilter/ipset/ip_set_hash_ipport.c
index e1ca11196515..7303138e46be 100644
--- a/net/netfilter/ipset/ip_set_hash_ipport.c
+++ b/net/netfilter/ipset/ip_set_hash_ipport.c
@@ -173,6 +173,9 @@ hash_ipport4_uadt(struct ip_set *set, struct nlattr *tb[],
swap(port, port_to);
}
+ if (((u64)ip_to - ip + 1)*(port_to - port + 1) > IPSET_MAX_RANGE)
+ return -ERANGE;
+
if (retried)
ip = ntohl(h->next.ip);
for (; ip <= ip_to; ip++) {
diff --git a/net/netfilter/ipset/ip_set_hash_ipportip.c b/net/netfilter/ipset/ip_set_hash_ipportip.c
index ab179e064597..334fb1ad0e86 100644
--- a/net/netfilter/ipset/ip_set_hash_ipportip.c
+++ b/net/netfilter/ipset/ip_set_hash_ipportip.c
@@ -180,6 +180,9 @@ hash_ipportip4_uadt(struct ip_set *set, struct nlattr *tb[],
swap(port, port_to);
}
+ if (((u64)ip_to - ip + 1)*(port_to - port + 1) > IPSET_MAX_RANGE)
+ return -ERANGE;
+
if (retried)
ip = ntohl(h->next.ip);
for (; ip <= ip_to; ip++) {
diff --git a/net/netfilter/ipset/ip_set_hash_ipportnet.c b/net/netfilter/ipset/ip_set_hash_ipportnet.c
index 8f075b44cf64..7df94f437f60 100644
--- a/net/netfilter/ipset/ip_set_hash_ipportnet.c
+++ b/net/netfilter/ipset/ip_set_hash_ipportnet.c
@@ -253,6 +253,9 @@ hash_ipportnet4_uadt(struct ip_set *set, struct nlattr *tb[],
swap(port, port_to);
}
+ if (((u64)ip_to - ip + 1)*(port_to - port + 1) > IPSET_MAX_RANGE)
+ return -ERANGE;
+
ip2_to = ip2_from;
if (tb[IPSET_ATTR_IP2_TO]) {
ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP2_TO], &ip2_to);
diff --git a/net/netfilter/ipset/ip_set_hash_net.c b/net/netfilter/ipset/ip_set_hash_net.c
index c1a11f041ac6..1422739d9aa2 100644
--- a/net/netfilter/ipset/ip_set_hash_net.c
+++ b/net/netfilter/ipset/ip_set_hash_net.c
@@ -140,7 +140,7 @@ hash_net4_uadt(struct ip_set *set, struct nlattr *tb[],
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_net4_elem e = { .cidr = HOST_MASK };
struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
- u32 ip = 0, ip_to = 0;
+ u32 ip = 0, ip_to = 0, ipn, n = 0;
int ret;
if (tb[IPSET_ATTR_LINENO])
@@ -188,6 +188,15 @@ hash_net4_uadt(struct ip_set *set, struct nlattr *tb[],
if (ip + UINT_MAX == ip_to)
return -IPSET_ERR_HASH_RANGE;
}
+ ipn = ip;
+ do {
+ ipn = ip_set_range_to_cidr(ipn, ip_to, &e.cidr);
+ n++;
+ } while (ipn++ < ip_to);
+
+ if (n > IPSET_MAX_RANGE)
+ return -ERANGE;
+
if (retried)
ip = ntohl(h->next.ip);
do {
diff --git a/net/netfilter/ipset/ip_set_hash_netiface.c b/net/netfilter/ipset/ip_set_hash_netiface.c
index ddd51c2e1cb3..9810f5bf63f5 100644
--- a/net/netfilter/ipset/ip_set_hash_netiface.c
+++ b/net/netfilter/ipset/ip_set_hash_netiface.c
@@ -202,7 +202,7 @@ hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[],
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_netiface4_elem e = { .cidr = HOST_MASK, .elem = 1 };
struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
- u32 ip = 0, ip_to = 0;
+ u32 ip = 0, ip_to = 0, ipn, n = 0;
int ret;
if (tb[IPSET_ATTR_LINENO])
@@ -256,6 +256,14 @@ hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[],
} else {
ip_set_mask_from_to(ip, ip_to, e.cidr);
}
+ ipn = ip;
+ do {
+ ipn = ip_set_range_to_cidr(ipn, ip_to, &e.cidr);
+ n++;
+ } while (ipn++ < ip_to);
+
+ if (n > IPSET_MAX_RANGE)
+ return -ERANGE;
if (retried)
ip = ntohl(h->next.ip);
diff --git a/net/netfilter/ipset/ip_set_hash_netnet.c b/net/netfilter/ipset/ip_set_hash_netnet.c
index 6532f0505e66..3d09eefe998a 100644
--- a/net/netfilter/ipset/ip_set_hash_netnet.c
+++ b/net/netfilter/ipset/ip_set_hash_netnet.c
@@ -168,7 +168,8 @@ hash_netnet4_uadt(struct ip_set *set, struct nlattr *tb[],
struct hash_netnet4_elem e = { };
struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
u32 ip = 0, ip_to = 0;
- u32 ip2 = 0, ip2_from = 0, ip2_to = 0;
+ u32 ip2 = 0, ip2_from = 0, ip2_to = 0, ipn;
+ u64 n = 0, m = 0;
int ret;
if (tb[IPSET_ATTR_LINENO])
@@ -244,6 +245,19 @@ hash_netnet4_uadt(struct ip_set *set, struct nlattr *tb[],
} else {
ip_set_mask_from_to(ip2_from, ip2_to, e.cidr[1]);
}
+ ipn = ip;
+ do {
+ ipn = ip_set_range_to_cidr(ipn, ip_to, &e.cidr[0]);
+ n++;
+ } while (ipn++ < ip_to);
+ ipn = ip2_from;
+ do {
+ ipn = ip_set_range_to_cidr(ipn, ip2_to, &e.cidr[1]);
+ m++;
+ } while (ipn++ < ip2_to);
+
+ if (n*m > IPSET_MAX_RANGE)
+ return -ERANGE;
if (retried) {
ip = ntohl(h->next.ip[0]);
diff --git a/net/netfilter/ipset/ip_set_hash_netport.c b/net/netfilter/ipset/ip_set_hash_netport.c
index ec1564a1cb5a..09cf72eb37f8 100644
--- a/net/netfilter/ipset/ip_set_hash_netport.c
+++ b/net/netfilter/ipset/ip_set_hash_netport.c
@@ -158,7 +158,8 @@ hash_netport4_uadt(struct ip_set *set, struct nlattr *tb[],
ipset_adtfn adtfn = set->variant->adt[adt];
struct hash_netport4_elem e = { .cidr = HOST_MASK - 1 };
struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
- u32 port, port_to, p = 0, ip = 0, ip_to = 0;
+ u32 port, port_to, p = 0, ip = 0, ip_to = 0, ipn;
+ u64 n = 0;
bool with_ports = false;
u8 cidr;
int ret;
@@ -235,6 +236,14 @@ hash_netport4_uadt(struct ip_set *set, struct nlattr *tb[],
} else {
ip_set_mask_from_to(ip, ip_to, e.cidr + 1);
}
+ ipn = ip;
+ do {
+ ipn = ip_set_range_to_cidr(ipn, ip_to, &cidr);
+ n++;
+ } while (ipn++ < ip_to);
+
+ if (n*(port_to - port + 1) > IPSET_MAX_RANGE)
+ return -ERANGE;
if (retried) {
ip = ntohl(h->next.ip);
diff --git a/net/netfilter/ipset/ip_set_hash_netportnet.c b/net/netfilter/ipset/ip_set_hash_netportnet.c
index 0e91d1e82f1c..19bcdb3141f6 100644
--- a/net/netfilter/ipset/ip_set_hash_netportnet.c
+++ b/net/netfilter/ipset/ip_set_hash_netportnet.c
@@ -182,7 +182,8 @@ hash_netportnet4_uadt(struct ip_set *set, struct nlattr *tb[],
struct hash_netportnet4_elem e = { };
struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
u32 ip = 0, ip_to = 0, p = 0, port, port_to;
- u32 ip2_from = 0, ip2_to = 0, ip2;
+ u32 ip2_from = 0, ip2_to = 0, ip2, ipn;
+ u64 n = 0, m = 0;
bool with_ports = false;
int ret;
@@ -284,6 +285,19 @@ hash_netportnet4_uadt(struct ip_set *set, struct nlattr *tb[],
} else {
ip_set_mask_from_to(ip2_from, ip2_to, e.cidr[1]);
}
+ ipn = ip;
+ do {
+ ipn = ip_set_range_to_cidr(ipn, ip_to, &e.cidr[0]);
+ n++;
+ } while (ipn++ < ip_to);
+ ipn = ip2_from;
+ do {
+ ipn = ip_set_range_to_cidr(ipn, ip2_to, &e.cidr[1]);
+ m++;
+ } while (ipn++ < ip2_to);
+
+ if (n*m*(port_to - port + 1) > IPSET_MAX_RANGE)
+ return -ERANGE;
if (retried) {
ip = ntohl(h->next.ip[0]);
--
2.20.1
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