netdev - [PATCH] netfilter: x_tables: fix incorrect parameter length before call copy_from

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Date: Tue,  9 Apr 2024 23:00:20 +0800
From: Edward Adam Davis <eadavis@...com>
To: netdev@...r.kernel.org
Cc: andrii@...nel.org,
	ast@...nel.org,
	bpf@...r.kernel.org,
	daniel@...earbox.net,
	haoluo@...gle.com,
	john.fastabend@...il.com,
	jolsa@...nel.org,
	kpsingh@...nel.org,
	linux-kernel@...r.kernel.org,
	martin.lau@...ux.dev,
	sdf@...gle.com,
	song@...nel.org,
	syzkaller-bugs@...glegroups.com,
	yonghong.song@...ux.dev
Subject: [PATCH] netfilter: x_tables: fix incorrect parameter length before call copy_from_sockptr

If len < sizeof(tmp) it will trigger oob, so take the min of them.

Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 net/ipv4/netfilter/arp_tables.c | 4 ++--
 net/ipv4/netfilter/ip_tables.c  | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 2407066b0fec..dc9166b48069 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -956,7 +956,7 @@ static int do_replace(struct net *net, sockptr_t arg, unsigned int len)
 	void *loc_cpu_entry;
 	struct arpt_entry *iter;
 
-	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, min_t(unsigned int, sizeof(tmp), len)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
@@ -1254,7 +1254,7 @@ static int compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
 	void *loc_cpu_entry;
 	struct arpt_entry *iter;
 
-	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, min_t(unsigned int, sizeof(tmp), len)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 7da1df4997d0..94a0afd8f94f 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1108,7 +1108,7 @@ do_replace(struct net *net, sockptr_t arg, unsigned int len)
 	void *loc_cpu_entry;
 	struct ipt_entry *iter;
 
-	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, min_t(unsigned int, sizeof(tmp), len)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
@@ -1492,7 +1492,7 @@ compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
 	void *loc_cpu_entry;
 	struct ipt_entry *iter;
 
-	if (copy_from_sockptr(&tmp, arg, sizeof(tmp)) != 0)
+	if (copy_from_sockptr(&tmp, arg, min_t(unsigned int, sizeof(tmp), len)) != 0)
 		return -EFAULT;
 
 	/* overflow check */
-- 
2.43.0