Bit helper functions were used for manipulation with NFACCT_F_OVERQUOTA,
but they are accepting pit position, but not a bit mask. As a result
not a third bit for NFACCT_F_OVERQUOTA was set, but forth. Such
behaviour was dangarous and could lead to unexpected overquota report
result.
Signed-off-by: Alexey Perevalov <a.perevalov@xxxxxxxxxxx>
---
include/uapi/linux/netfilter/nfnetlink_acct.h | 5 ++++-
net/netfilter/nfnetlink_acct.c | 7 ++++---
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/include/uapi/linux/netfilter/nfnetlink_acct.h b/include/uapi/linux/netfilter/nfnetlink_acct.h
index 51404ec..81410b7 100644
--- a/include/uapi/linux/netfilter/nfnetlink_acct.h
+++ b/include/uapi/linux/netfilter/nfnetlink_acct.h
@@ -14,10 +14,13 @@ enum nfnl_acct_msg_types {
NFNL_MSG_ACCT_MAX
};
+#define NFACCT_OVERQUOTA_BIT 2
+
enum nfnl_acct_flags {
NFACCT_F_QUOTA_PKTS = (1 << 0),
NFACCT_F_QUOTA_BYTES = (1 << 1),
- NFACCT_F_OVERQUOTA = (1 << 2), /* can't be set from userspace */
+ NFACCT_F_OVERQUOTA = (1 << NFACCT_OVERQUOTA_BIT), /* can't be
+ set from userspace */
};
enum nfnl_acct_type {
diff --git a/net/netfilter/nfnetlink_acct.c b/net/netfilter/nfnetlink_acct.c
index 11d863c..5f6b1fb 100644
--- a/net/netfilter/nfnetlink_acct.c
+++ b/net/netfilter/nfnetlink_acct.c
@@ -77,7 +77,8 @@ nfnl_acct_new(struct sock *nfnl, struct sk_buff *skb,
smp_mb__before_atomic();
/* reset overquota flag if quota is enabled. */
if ((matching->flags & NFACCT_F_QUOTA))
- clear_bit(NFACCT_F_OVERQUOTA, &matching->flags);
+ clear_bit(NFACCT_OVERQUOTA_BIT,
+ &matching->flags);
return 0;
}
return -EBUSY;
@@ -150,7 +151,7 @@ nfnl_acct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
bytes = atomic64_xchg(&acct->bytes, 0);
smp_mb__before_atomic();
if (acct->flags & NFACCT_F_QUOTA)
- clear_bit(NFACCT_F_OVERQUOTA, &acct->flags);
+ clear_bit(NFACCT_OVERQUOTA_BIT, &acct->flags);
} else {
pkts = atomic64_read(&acct->pkts);
bytes = atomic64_read(&acct->bytes);
@@ -414,7 +415,7 @@ int nfnl_acct_overquota(const struct sk_buff *skb, struct nf_acct *nfacct)
ret = now > *quota;
if (now >= *quota &&
- !test_and_set_bit(NFACCT_F_OVERQUOTA, &nfacct->flags)) {
+ !test_and_set_bit(NFACCT_OVERQUOTA_BIT, &nfacct->flags)) {
nfnl_overquota_report(nfacct);
}
--
1.7.9.5
--
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