Ensure that cmsg->cmsg_type value is valid for qpolicy that is currently in use.
Slightly revised version after comments from Gerrit.
Signed-off-by: Tomasz Grobelny <tomasz@xxxxxxxxxxxxxxxxxxxxxxx>
---
net/dccp/dccp.h | 1 +
net/dccp/proto.c | 3 +++
net/dccp/qpolicy.c | 23 +++++++++++++++++------
3 files changed, 21 insertions(+), 6 deletions(-)
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index 9c60d01..286bb34 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, __be32 param);
/*
* TX Packet Output and TX Timers
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index d818606..582d37d 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -733,6 +733,9 @@ static int dccp_msghdr_parse(struct msghdr *msg, struct sk_buff *skb)
if (cmsg->cmsg_level != SOL_DCCP)
continue;
+ if (!dccp_qpolicy_param_ok(skb->sk, cmsg->cmsg_type))
+ return -EINVAL;
+
switch (cmsg->cmsg_type) {
case DCCP_SCM_PRIORITY:
if (cmsg->cmsg_len != CMSG_LEN(sizeof(__u32)))
diff --git a/net/dccp/qpolicy.c b/net/dccp/qpolicy.c
index 414696b..27383f8 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);
+ __be32 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, __be32 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
--
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