netdev - [DCCP][QPOLICY]: More strict controlling of supplied parameters

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Date:	Thu, 10 Jul 2008 01:20:45 +0200
From:	Tomasz Grobelny <tomasz@...belny.oswiecenia.net>
To:	Gerrit Renker <gerrit@....abdn.ac.uk>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	dccp@...r.kernel.org, netdev@...r.kernel.org
Subject: [DCCP][QPOLICY]: More strict controlling of supplied parameters

Ensure that cmsg->cmsg_type value is valid for qpolicy that is currently in 
use.

Signed-off-by: Tomasz Grobelny <tomasz@...belny.oswiecenia.net>
---
 net/dccp/dccp.h    |    1 +
 net/dccp/proto.c   |    8 ++++++--
 net/dccp/qpolicy.c |   23 +++++++++++++++++------
 3 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index 9c60d01..988eea7 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -241,6 +241,7 @@ extern bool		dccp_qpolicy_full(struct sock *sk);
 extern void		dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb);
 extern struct sk_buff	*dccp_qpolicy_top(struct sock *sk);
 extern struct sk_buff	*dccp_qpolicy_pop(struct sock *sk);
+extern bool		dccp_qpolicy_param_ok(struct sock *sk, int param);
 
 /*
  * TX Packet Output and TX Timers
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index d818606..7d6dbc1 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -709,7 +709,8 @@ int compat_dccp_getsockopt(struct sock *sk, int level, int 
optname,
 EXPORT_SYMBOL_GPL(compat_dccp_getsockopt);
 #endif
 
-static int dccp_msghdr_parse(struct msghdr *msg, struct sk_buff *skb)
+static int dccp_msghdr_parse(struct msghdr *msg, struct sk_buff *skb,
+							struct sock *sk)
 {
 	struct cmsghdr *cmsg = CMSG_FIRSTHDR(msg);
 
@@ -733,6 +734,9 @@ static int dccp_msghdr_parse(struct msghdr *msg, struct 
sk_buff *skb)
 		if (cmsg->cmsg_level != SOL_DCCP)
 			continue;
 
+		if (!dccp_qpolicy_param_ok(sk, cmsg->cmsg_type))
+			return -EINVAL;
+
 		switch (cmsg->cmsg_type) {
 		case DCCP_SCM_PRIORITY:
 			if (cmsg->cmsg_len != CMSG_LEN(sizeof(__u32)))
@@ -789,7 +793,7 @@ int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, 
struct msghdr *msg,
 	if (rc != 0)
 		goto out_discard;
 
-	rc = dccp_msghdr_parse(msg, skb);
+	rc = dccp_msghdr_parse(msg, skb, sk);
 	if (rc != 0)
 		goto out_discard;
 
diff --git a/net/dccp/qpolicy.c b/net/dccp/qpolicy.c
index 414696b..4ca6e5b 100644
--- a/net/dccp/qpolicy.c
+++ b/net/dccp/qpolicy.c
@@ -73,17 +73,20 @@ static struct dccp_qpolicy_operations {
 	void		(*push)	(struct sock *sk, struct sk_buff *skb);
 	bool		(*full) (struct sock *sk);
 	struct sk_buff*	(*top)  (struct sock *sk);
+	unsigned int	params;
 
 } qpol_table[DCCPQ_POLICY_MAX] = {
 	[DCCPQ_POLICY_SIMPLE] = {
-		.push = qpolicy_simple_push,
-		.full = qpolicy_simple_full,
-		.top  = qpolicy_simple_top,
+		.push   = qpolicy_simple_push,
+		.full   = qpolicy_simple_full,
+		.top    = qpolicy_simple_top,
+		.params = 0,
 	},
 	[DCCPQ_POLICY_PRIO] = {
-		.push = qpolicy_simple_push,
-		.full = qpolicy_prio_full,
-		.top  = qpolicy_prio_best_skb,
+		.push   = qpolicy_simple_push,
+		.full   = qpolicy_prio_full,
+		.top    = qpolicy_prio_best_skb,
+		.params = DCCP_SCM_PRIORITY,
 	},
 };
 
@@ -124,3 +127,11 @@ struct sk_buff *dccp_qpolicy_pop(struct sock *sk)
 		skb_unlink(skb, &sk->sk_write_queue);
 	return skb;
 }
+
+bool dccp_qpolicy_param_ok(struct sock *sk, int param)
+{
+	/* check if exactly one bit is set */
+	if (!param || (param & (param - 1)))
+		return false;
+	return (qpol_table[dccp_sk(sk)->dccps_qpolicy].params & param) == param;
+}
-- 
1.5.4.5
-- 
Regards,
Tomasz Grobelny
--
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