From 2e9684595ceeb850702f21b84f25f39c4cece24c Mon Sep 17 00:00:00 2001

From: Nelson Elhage <nelhage@ksplice.com>

Date: Wed, 3 Nov 2010 16:35:41 +0000

Subject: inet_diag: Make sure we actually run the same bytecode we audited.

We were using nlmsg_find_attr() to look up the bytecode by attribute when

auditing, but then just using the first attribute when actually running

bytecode. So, if we received a message with two attribute elements, where only

the second had type INET_DIAG_REQ_BYTECODE, we would validate and run different

bytecode strings.

Fix this by consistently using nlmsg_find_attr everywhere.

Signed-off-by: Nelson Elhage <nelhage@ksplice.com>

Signed-off-by: Thomas Graf <tgraf@infradead.org>

Signed-off-by: David S. Miller <davem@davemloft.net>

---

 net/ipv4/inet_diag.c |   27 ++++++++++++++++-----------

 1 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c

index e5fa2dd..7403b9b 100644

--- a/net/ipv4/inet_diag.c

+++ b/net/ipv4/inet_diag.c

@@ -490,9 +490,11 @@ static int inet_csk_diag_dump(struct sock *sk,

 {

 	struct inet_diag_req *r = NLMSG_DATA(cb->nlh);

-	if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {

+	if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {

 		struct inet_diag_entry entry;

-		struct rtattr *bc = (struct rtattr *)(r + 1);

+		const struct nlattr *bc = nlmsg_find_attr(cb->nlh,

+							  sizeof(*r),

+							  INET_DIAG_REQ_BYTECODE);

 		struct inet_sock *inet = inet_sk(sk);

 		entry.family = sk->sk_family;

@@ -512,7 +514,7 @@ static int inet_csk_diag_dump(struct sock *sk,

 		entry.dport = ntohs(inet->inet_dport);

 		entry.userlocks = sk->sk_userlocks;

-		if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))

+		if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))

 			return 0;

 	}

@@ -527,9 +529,11 @@ static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,

 {

 	struct inet_diag_req *r = NLMSG_DATA(cb->nlh);

-	if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {

+	if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {

 		struct inet_diag_entry entry;

-		struct rtattr *bc = (struct rtattr *)(r + 1);

+		const struct nlattr *bc = nlmsg_find_attr(cb->nlh,

+							  sizeof(*r),

+							  INET_DIAG_REQ_BYTECODE);

 		entry.family = tw->tw_family;

 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)

@@ -548,7 +552,7 @@ static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,

 		entry.dport = ntohs(tw->tw_dport);

 		entry.userlocks = 0;

-		if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))

+		if (!inet_diag_bc_run(nla_data(bc), nla_len(bc), &entry))

 			return 0;

 	}

@@ -618,7 +622,7 @@ static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,

 	struct inet_diag_req *r = NLMSG_DATA(cb->nlh);

 	struct inet_connection_sock *icsk = inet_csk(sk);

 	struct listen_sock *lopt;

-	struct rtattr *bc = NULL;

+	const struct nlattr *bc = NULL;

 	struct inet_sock *inet = inet_sk(sk);

 	int j, s_j;

 	int reqnum, s_reqnum;

@@ -638,8 +642,9 @@ static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,

 	if (!lopt || !lopt->qlen)

 		goto out;

-	if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {

-		bc = (struct rtattr *)(r + 1);

+	if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {

+		bc = nlmsg_find_attr(cb->nlh, sizeof(*r),

+				     INET_DIAG_REQ_BYTECODE);

 		entry.sport = inet->inet_num;

 		entry.userlocks = sk->sk_userlocks;

 	}

@@ -672,8 +677,8 @@ static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,

 					&ireq->rmt_addr;

 				entry.dport = ntohs(ireq->rmt_port);

-				if (!inet_diag_bc_run(RTA_DATA(bc),

-						    RTA_PAYLOAD(bc), &entry))

+				if (!inet_diag_bc_run(nla_data(bc),

+						      nla_len(bc), &entry))

 					continue;

 			}

-- 

1.7.3.2