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authorLiping Zhang <zlpnobody@gmail.com>2017-04-17 15:18:57 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2017-04-24 20:06:28 +0200
commit53b56da83d7899de375a9de153fd7f5397de85e6 (patch)
tree28962145c0e5a76f12c59d5eeb25fb7d4f939626
parentnetfilter: ctnetlink: fix deadlock due to acquire _expect_lock twice (diff)
downloadlinux-53b56da83d7899de375a9de153fd7f5397de85e6.tar.xz
linux-53b56da83d7899de375a9de153fd7f5397de85e6.zip
netfilter: ctnetlink: make it safer when updating ct->status
After converting to use rcu for conntrack hash, one CPU may update the ct->status via ctnetlink, while another CPU may process the packets and update the ct->status. So the non-atomic operation "ct->status |= status;" via ctnetlink becomes unsafe, and this may clear the IPS_DYING_BIT bit set by another CPU unexpectedly. For example: CPU0 CPU1 ctnetlink_change_status __nf_conntrack_find_get old = ct->status nf_ct_gc_expired - nf_ct_kill - test_and_set_bit(IPS_DYING_BIT new = old | status; - ct->status = new; <-- oops, _DYING_ is cleared! Now using a series of atomic bit operation to solve the above issue. Also note, user shouldn't set IPS_TEMPLATE, IPS_SEQ_ADJUST directly, so make these two bits be unchangable too. If we set the IPS_TEMPLATE_BIT, ct will be freed by nf_ct_tmpl_free, but actually it is alloced by nf_conntrack_alloc. If we set the IPS_SEQ_ADJUST_BIT, this may cause the NULL pointer deference, as the nfct_seqadj(ct) maybe NULL. Last, add some comments to describe the logic change due to the commit a963d710f367 ("netfilter: ctnetlink: Fix regression in CTA_STATUS processing"), which makes me feel a little confusing. Fixes: 76507f69c44e ("[NETFILTER]: nf_conntrack: use RCU for conntrack hash") Signed-off-by: Liping Zhang <zlpnobody@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
-rw-r--r--include/uapi/linux/netfilter/nf_conntrack_common.h13
-rw-r--r--net/netfilter/nf_conntrack_netlink.c33
2 files changed, 33 insertions, 13 deletions
diff --git a/include/uapi/linux/netfilter/nf_conntrack_common.h b/include/uapi/linux/netfilter/nf_conntrack_common.h
index 6a8e33dd4ecb..38fc383139f0 100644
--- a/include/uapi/linux/netfilter/nf_conntrack_common.h
+++ b/include/uapi/linux/netfilter/nf_conntrack_common.h
@@ -82,10 +82,6 @@ enum ip_conntrack_status {
IPS_DYING_BIT = 9,
IPS_DYING = (1 << IPS_DYING_BIT),
- /* Bits that cannot be altered from userland. */
- IPS_UNCHANGEABLE_MASK = (IPS_NAT_DONE_MASK | IPS_NAT_MASK |
- IPS_EXPECTED | IPS_CONFIRMED | IPS_DYING),
-
/* Connection has fixed timeout. */
IPS_FIXED_TIMEOUT_BIT = 10,
IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
@@ -101,6 +97,15 @@ enum ip_conntrack_status {
/* Conntrack got a helper explicitly attached via CT target. */
IPS_HELPER_BIT = 13,
IPS_HELPER = (1 << IPS_HELPER_BIT),
+
+ /* Be careful here, modifying these bits can make things messy,
+ * so don't let users modify them directly.
+ */
+ IPS_UNCHANGEABLE_MASK = (IPS_NAT_DONE_MASK | IPS_NAT_MASK |
+ IPS_EXPECTED | IPS_CONFIRMED | IPS_DYING |
+ IPS_SEQ_ADJUST | IPS_TEMPLATE),
+
+ __IPS_MAX_BIT = 14,
};
/* Connection tracking event types */
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index e5f97777b1f4..86deed6a8db4 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1419,6 +1419,24 @@ ctnetlink_parse_nat_setup(struct nf_conn *ct,
}
#endif
+static void
+__ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
+ unsigned long off)
+{
+ unsigned int bit;
+
+ /* Ignore these unchangable bits */
+ on &= ~IPS_UNCHANGEABLE_MASK;
+ off &= ~IPS_UNCHANGEABLE_MASK;
+
+ for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
+ if (on & (1 << bit))
+ set_bit(bit, &ct->status);
+ else if (off & (1 << bit))
+ clear_bit(bit, &ct->status);
+ }
+}
+
static int
ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
{
@@ -1438,10 +1456,7 @@ ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
/* ASSURED bit can only be set */
return -EBUSY;
- /* Be careful here, modifying NAT bits can screw up things,
- * so don't let users modify them directly if they don't pass
- * nf_nat_range. */
- ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
+ __ctnetlink_change_status(ct, status, 0);
return 0;
}
@@ -1628,7 +1643,7 @@ ctnetlink_change_seq_adj(struct nf_conn *ct,
if (ret < 0)
return ret;
- ct->status |= IPS_SEQ_ADJUST;
+ set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
}
if (cda[CTA_SEQ_ADJ_REPLY]) {
@@ -1637,7 +1652,7 @@ ctnetlink_change_seq_adj(struct nf_conn *ct,
if (ret < 0)
return ret;
- ct->status |= IPS_SEQ_ADJUST;
+ set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
}
return 0;
@@ -2289,10 +2304,10 @@ ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
/* This check is less strict than ctnetlink_change_status()
* because callers often flip IPS_EXPECTED bits when sending
* an NFQA_CT attribute to the kernel. So ignore the
- * unchangeable bits but do not error out.
+ * unchangeable bits but do not error out. Also user programs
+ * are allowed to clear the bits that they are allowed to change.
*/
- ct->status = (status & ~IPS_UNCHANGEABLE_MASK) |
- (ct->status & IPS_UNCHANGEABLE_MASK);
+ __ctnetlink_change_status(ct, status, ~status);
return 0;
}