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Date: Sun, 21 Aug 2016 17:29:10 +0200
From: Willy Tarreau <w@....eu>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Dave Jones <davej@...emonkey.org.uk>,
Pablo Neira Ayuso <pablo@...filter.org>,
Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 020/180] netfilter: ensure number of counters is >0 in do_replace()
From: Dave Jones <davej@...emonkey.org.uk>
commit 1086bbe97a074844188c6c988fa0b1a98c3ccbb9 upstream.
After improving setsockopt() coverage in trinity, I started triggering
vmalloc failures pretty reliably from this code path:
warn_alloc_failed+0xe9/0x140
__vmalloc_node_range+0x1be/0x270
vzalloc+0x4b/0x50
__do_replace+0x52/0x260 [ip_tables]
do_ipt_set_ctl+0x15d/0x1d0 [ip_tables]
nf_setsockopt+0x65/0x90
ip_setsockopt+0x61/0xa0
raw_setsockopt+0x16/0x60
sock_common_setsockopt+0x14/0x20
SyS_setsockopt+0x71/0xd0
It turns out we don't validate that the num_counters field in the
struct we pass in from userspace is initialized.
The same problem also exists in ebtables, arptables, ipv6, and the
compat variants.
Signed-off-by: Dave Jones <davej@...emonkey.org.uk>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
net/bridge/netfilter/ebtables.c | 4 ++++
net/ipv4/netfilter/arp_tables.c | 6 ++++++
net/ipv4/netfilter/ip_tables.c | 6 ++++++
net/ipv6/netfilter/ip6_tables.c | 6 ++++++
4 files changed, 22 insertions(+)
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 6651a77..8d60948 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1105,6 +1105,8 @@ static int do_replace(struct net *net, const void __user *user,
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct ebt_counter))
return -ENOMEM;
+ if (tmp.num_counters == 0)
+ return -EINVAL;
tmp.name[sizeof(tmp.name) - 1] = 0;
@@ -2150,6 +2152,8 @@ static int compat_copy_ebt_replace_from_user(struct ebt_replace *repl,
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct ebt_counter))
return -ENOMEM;
+ if (tmp.num_counters == 0)
+ return -EINVAL;
memcpy(repl, &tmp, offsetof(struct ebt_replace, hook_entry));
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index b6fa4cc..b65b562 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -1076,6 +1076,9 @@ static int do_replace(struct net *net, const void __user *user,
/* overflow check */
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
+ if (tmp.num_counters == 0)
+ return -EINVAL;
+
tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);
@@ -1490,6 +1493,9 @@ static int compat_do_replace(struct net *net, void __user *user,
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
+ if (tmp.num_counters == 0)
+ return -EINVAL;
+
tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index d68137b..b9dd1fd 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1262,6 +1262,9 @@ do_replace(struct net *net, const void __user *user, unsigned int len)
/* overflow check */
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
+ if (tmp.num_counters == 0)
+ return -EINVAL;
+
tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);
@@ -1797,6 +1800,9 @@ compat_do_replace(struct net *net, void __user *user, unsigned int len)
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
+ if (tmp.num_counters == 0)
+ return -EINVAL;
+
tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 49ec278..6e7f5ac 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -1272,6 +1272,9 @@ do_replace(struct net *net, const void __user *user, unsigned int len)
/* overflow check */
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
+ if (tmp.num_counters == 0)
+ return -EINVAL;
+
tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);
@@ -1806,6 +1809,9 @@ compat_do_replace(struct net *net, void __user *user, unsigned int len)
return -ENOMEM;
if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters))
return -ENOMEM;
+ if (tmp.num_counters == 0)
+ return -EINVAL;
+
tmp.name[sizeof(tmp.name)-1] = 0;
newinfo = xt_alloc_table_info(tmp.size);
--
2.8.0.rc2.1.gbe9624a
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