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Date: Tue, 2 Sep 2014 11:07:19 -0700
From: Cong Wang <xiyou.wangcong@...il.com>
To: netdev@...r.kernel.org
Cc: Cong Wang <xiyou.wangcong@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Hannes Frederic Sowa <hannes@...essinduktion.org>,
Sabrina Dubroca <sd@...asysnail.net>
Subject: [Patch net] ipv6: fix rtnl lock assertion failure in ipv6_sock_ac_join()
Tommi reported the following RTNL lock assertion failure:
[ 77.297196] RTNL: assertion failed at net/ipv6/addrconf.c (1699)
[ 77.298080] CPU: 0 PID: 4842 Comm: trinity-main Not tainted 3.17.0-rc2+ #30
[ 77.299039] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 77.299789] ffff88003d76a618 ffff880026133c50 ffffffff8238ba79
ffff880037c84520
[ 77.300829] ffff880026133c90 ffffffff820bd52b 0000000000000000
ffffffff82d86c40
[ 77.301869] 0000000000000000 00000000f76fd1e1 ffff8800382d8000
ffff8800382d8220
[ 77.302906] Call Trace:
[ 77.303246] [<ffffffff8238ba79>] dump_stack+0x4d/0x66
[ 77.303928] [<ffffffff820bd52b>] addrconf_join_solict+0x4b/0xb0
[ 77.304731] [<ffffffff820b031b>] ipv6_dev_ac_inc+0x2bb/0x330
[ 77.305498] [<ffffffff820b0060>] ? ac6_seq_start+0x260/0x260
[ 77.306257] [<ffffffff820b05fe>] ipv6_sock_ac_join+0x26e/0x360
[ 77.307046] [<ffffffff820b0429>] ? ipv6_sock_ac_join+0x99/0x360
[ 77.307798] [<ffffffff820cdd60>] do_ipv6_setsockopt.isra.5+0xa70/0xf20
This is due to we don't hold rtnl lock when calling addrconf_join_solict()
in ipv6_sock_ac_join(). So hold rtnl lock instead of RCU lock here,
after all it is not a hot path.
BTW, mcast _might_ have similar problem, but I don't touch it since no one
reports so far.
Reported-by: Tommi Rantala <tt.rantala@...il.com>
Tested-by: Sabrina Dubroca <sd@...asysnail.net>
Cc: David S. Miller <davem@...emloft.net>
Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
include/linux/netdevice.h | 4 ++--
net/core/dev.c | 13 +++++++------
net/ipv6/anycast.c | 22 +++++++++++-----------
3 files changed, 20 insertions(+), 19 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 38377392..71838bb 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2074,8 +2074,8 @@ void __dev_remove_pack(struct packet_type *pt);
void dev_add_offload(struct packet_offload *po);
void dev_remove_offload(struct packet_offload *po);
-struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
- unsigned short mask);
+struct net_device *__dev_get_by_flags(struct net *net, unsigned short flags,
+ unsigned short mask);
struct net_device *dev_get_by_name(struct net *net, const char *name);
struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
struct net_device *__dev_get_by_name(struct net *net, const char *name);
diff --git a/net/core/dev.c b/net/core/dev.c
index ab9a165..343847a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -897,23 +897,24 @@ struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
EXPORT_SYMBOL(dev_getfirstbyhwtype);
/**
- * dev_get_by_flags_rcu - find any device with given flags
+ * __dev_get_by_flags - find any device with given flags
* @net: the applicable net namespace
* @if_flags: IFF_* values
* @mask: bitmask of bits in if_flags to check
*
* Search for any interface with the given flags. Returns NULL if a device
* is not found or a pointer to the device. Must be called inside
- * rcu_read_lock(), and result refcount is unchanged.
+ * rtnl_lock(), and result refcount is unchanged.
*/
-struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
- unsigned short mask)
+struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags,
+ unsigned short mask)
{
struct net_device *dev, *ret;
+ ASSERT_RTNL();
ret = NULL;
- for_each_netdev_rcu(net, dev) {
+ for_each_netdev(net, dev) {
if (((dev->flags ^ if_flags) & mask) == 0) {
ret = dev;
break;
@@ -921,7 +922,7 @@ struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags
}
return ret;
}
-EXPORT_SYMBOL(dev_get_by_flags_rcu);
+EXPORT_SYMBOL(__dev_get_by_flags);
/**
* dev_valid_name - check if name is okay for network device
diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c
index 2101832..484ed23 100644
--- a/net/ipv6/anycast.c
+++ b/net/ipv6/anycast.c
@@ -77,7 +77,7 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
pac->acl_next = NULL;
pac->acl_addr = *addr;
- rcu_read_lock();
+ rtnl_lock();
if (ifindex == 0) {
struct rt6_info *rt;
@@ -90,11 +90,11 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
goto error;
} else {
/* router, no matching interface: just pick one */
- dev = dev_get_by_flags_rcu(net, IFF_UP,
- IFF_UP | IFF_LOOPBACK);
+ dev = __dev_get_by_flags(net, IFF_UP,
+ IFF_UP | IFF_LOOPBACK);
}
} else
- dev = dev_get_by_index_rcu(net, ifindex);
+ dev = __dev_get_by_index(net, ifindex);
if (dev == NULL) {
err = -ENODEV;
@@ -136,7 +136,7 @@ int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
}
error:
- rcu_read_unlock();
+ rtnl_unlock();
if (pac)
sock_kfree_s(sk, pac, sizeof(*pac));
return err;
@@ -171,11 +171,11 @@ int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
spin_unlock_bh(&ipv6_sk_ac_lock);
- rcu_read_lock();
- dev = dev_get_by_index_rcu(net, pac->acl_ifindex);
+ rtnl_lock();
+ dev = __dev_get_by_index(net, pac->acl_ifindex);
if (dev)
ipv6_dev_ac_dec(dev, &pac->acl_addr);
- rcu_read_unlock();
+ rtnl_unlock();
sock_kfree_s(sk, pac, sizeof(*pac));
return 0;
@@ -198,7 +198,7 @@ void ipv6_sock_ac_close(struct sock *sk)
spin_unlock_bh(&ipv6_sk_ac_lock);
prev_index = 0;
- rcu_read_lock();
+ rtnl_lock();
while (pac) {
struct ipv6_ac_socklist *next = pac->acl_next;
@@ -211,7 +211,7 @@ void ipv6_sock_ac_close(struct sock *sk)
sock_kfree_s(sk, pac, sizeof(*pac));
pac = next;
}
- rcu_read_unlock();
+ rtnl_unlock();
}
static void aca_put(struct ifacaddr6 *ac)
@@ -331,7 +331,7 @@ int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr)
return 0;
}
-/* called with rcu_read_lock() */
+/* called with rtnl_lock() */
static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr)
{
struct inet6_dev *idev = __in6_dev_get(dev);
--
1.8.3.1
--
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