[PATCH 8/9] netfilter: x_tables: enforce nul-terminated table name from getsockopt GET_ENTRIES

[Pablo Neira Ayuso]

Make sure the table names via getsockopt GET_ENTRIES is nul-terminated
in ebtables and all the x_tables variants and their respective compat
code. Uncovered by KASAN.

Reported-by: Baozeng Ding <splovi...@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
---
 net/bridge/netfilter/ebtables.c | 4 ++++
 net/ipv4/netfilter/arp_tables.c | 2 ++
 net/ipv4/netfilter/ip_tables.c  | 2 ++
 net/ipv6/netfilter/ip6_tables.c | 2 ++
 4 files changed, 10 insertions(+)

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 67b2e27..8570bc7 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1521,6 +1521,8 @@ static int do_ebt_get_ctl(struct sock *sk, int cmd, void 
__user *user, int *len)
        if (copy_from_user(&tmp, user, sizeof(tmp)))
                return -EFAULT;
 
+       tmp.name[sizeof(tmp.name) - 1] = '\0';
+
        t = find_table_lock(net, tmp.name, &ret, &ebt_mutex);
        if (!t)
                return ret;
@@ -2332,6 +2334,8 @@ static int compat_do_ebt_get_ctl(struct sock *sk, int cmd,
        if (copy_from_user(&tmp, user, sizeof(tmp)))
                return -EFAULT;
 
+       tmp.name[sizeof(tmp.name) - 1] = '\0';
+
        t = find_table_lock(net, tmp.name, &ret, &ebt_mutex);
        if (!t)
                return ret;
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index a1bb5e7..4133b0f 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -969,6 +969,7 @@ static int get_entries(struct net *net, struct 
arpt_get_entries __user *uptr,
                         sizeof(struct arpt_get_entries) + get.size);
                return -EINVAL;
        }
+       get.name[sizeof(get.name) - 1] = '\0';
 
        t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
        if (!IS_ERR_OR_NULL(t)) {
@@ -1663,6 +1664,7 @@ static int compat_get_entries(struct net *net,
                         *len, sizeof(get) + get.size);
                return -EINVAL;
        }
+       get.name[sizeof(get.name) - 1] = '\0';
 
        xt_compat_lock(NFPROTO_ARP);
        t = xt_find_table_lock(net, NFPROTO_ARP, get.name);
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 89b5d95..631c100 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1156,6 +1156,7 @@ get_entries(struct net *net, struct ipt_get_entries 
__user *uptr,
                         *len, sizeof(get) + get.size);
                return -EINVAL;
        }
+       get.name[sizeof(get.name) - 1] = '\0';
 
        t = xt_find_table_lock(net, AF_INET, get.name);
        if (!IS_ERR_OR_NULL(t)) {
@@ -1935,6 +1936,7 @@ compat_get_entries(struct net *net, struct 
compat_ipt_get_entries __user *uptr,
                         *len, sizeof(get) + get.size);
                return -EINVAL;
        }
+       get.name[sizeof(get.name) - 1] = '\0';
 
        xt_compat_lock(AF_INET);
        t = xt_find_table_lock(net, AF_INET, get.name);
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 541b59f..86b67b7 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1168,6 +1168,7 @@ get_entries(struct net *net, struct ip6t_get_entries 
__user *uptr,
                         *len, sizeof(get) + get.size);
                return -EINVAL;
        }
+       get.name[sizeof(get.name) - 1] = '\0';
 
        t = xt_find_table_lock(net, AF_INET6, get.name);
        if (!IS_ERR_OR_NULL(t)) {
@@ -1944,6 +1945,7 @@ compat_get_entries(struct net *net, struct 
compat_ip6t_get_entries __user *uptr,
                         *len, sizeof(get) + get.size);
                return -EINVAL;
        }
+       get.name[sizeof(get.name) - 1] = '\0';
 
        xt_compat_lock(AF_INET6);
        t = xt_find_table_lock(net, AF_INET6, get.name);
-- 
2.1.4