Commit ecd98837 authored by YOSHIFUJI Hideaki / 吉藤英明's avatar YOSHIFUJI Hideaki / 吉藤英明 Committed by David S. Miller
Browse files

ipv6: fix race condition regarding dst->expires and dst->from. 

Eric Dumazet wrote:
| Some strange crashes happen in rt6_check_expired(), with access
| to random addresses.
|
| At first glance, it looks like the RTF_EXPIRES and
| stuff added in commit 1716a961
| (ipv6: fix problem with expired dst cache)
| are racy : same dst could be manipulated at the same time
| on different cpus.
|
| At some point, our stack believes rt->dst.from contains a dst pointer,
| while its really a jiffie value (as rt->dst.expires shares the same area
| of memory)
|
| rt6_update_expires() should be fixed, or am I missing something ?
|
| CC Neil because of https://bugzilla.redhat.com/show_bug.cgi?id=892060



Because we do not have any locks for dst_entry, we cannot change
essential structure in the entry; e.g., we cannot change reference
to other entity.

To fix this issue, split 'from' and 'expires' field in dst_entry
out of union.  Once it is 'from' is assigned in the constructor,
keep the reference until the very last stage of the life time of
the object.

Of course, it is unsafe to change 'from', so make rt6_set_from simple
just for fresh entries.

Reported-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Reported-by: default avatarNeil Horman <nhorman@tuxdriver.com>
CC: Gao Feng <gaofeng@cn.fujitsu.com>
Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Reviewed-by: default avatarEric Dumazet <edumazet@google.com>
Reported-by: default avatarSteinar H. Gunderson <sesse@google.com>
Reviewed-by: default avatarNeil Horman <nhorman@tuxdriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 68534c68

include/net/dst.h

+2 −6
Original line number Diff line number Diff line
@@ -36,13 +36,9 @@ struct dst_entry { 
	struct net_device       *dev;

	struct  dst_ops	        *ops;

	unsigned long		_metrics;

	union {

	unsigned long           expires;

		/* point to where the dst_entry copied from */

		struct dst_entry        *from;

	};

	struct dst_entry	*path;

	void			*__pad0;

	struct dst_entry	*from;

#ifdef CONFIG_XFRM

	struct xfrm_state	*xfrm;

#else

include/net/ip6_fib.h

+12 −27
Original line number Diff line number Diff line
@@ -164,50 +164,35 @@ static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) 


static inline void rt6_clean_expires(struct rt6_info *rt)

{

	if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)

		dst_release(rt->dst.from);



	rt->rt6i_flags &= ~RTF_EXPIRES;

	rt->dst.from = NULL;

}



static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)

{

	if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)

		dst_release(rt->dst.from);



	rt->rt6i_flags |= RTF_EXPIRES;

	rt->dst.expires = expires;

	rt->rt6i_flags |= RTF_EXPIRES;

}



static inline void rt6_update_expires(struct rt6_info *rt, int timeout)

static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)

{

	if (!(rt->rt6i_flags & RTF_EXPIRES)) {

		if (rt->dst.from)

			dst_release(rt->dst.from);

		/* dst_set_expires relies on expires == 0 

		 * if it has not been set previously.

		 */

		rt->dst.expires = 0;

	}

	struct rt6_info *rt;



	dst_set_expires(&rt->dst, timeout);

	rt->rt6i_flags |= RTF_EXPIRES;

	for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES);

	     rt = (struct rt6_info *)rt->dst.from);

	if (rt && rt != rt0)

		rt0->dst.expires = rt->dst.expires;



	dst_set_expires(&rt0->dst, timeout);

	rt0->rt6i_flags |= RTF_EXPIRES;

}



static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)

{

	struct dst_entry *new = (struct dst_entry *) from;



	if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {

		if (new == rt->dst.from)

			return;

		dst_release(rt->dst.from);

	}



	rt->rt6i_flags &= ~RTF_EXPIRES;

	rt->dst.from = new;

	dst_hold(new);

	rt->dst.from = new;

}



static inline void ip6_rt_put(struct rt6_info *rt)

net/core/dst.c

+1 −0
Original line number Diff line number Diff line
@@ -179,6 +179,7 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev, 
	dst_init_metrics(dst, dst_default_metrics, true);

	dst->expires = 0UL;

	dst->path = dst;

	dst->from = NULL;

#ifdef CONFIG_XFRM

	dst->xfrm = NULL;

#endif

net/ipv6/route.c

+3 −5
Original line number Diff line number Diff line
@@ -287,6 +287,7 @@ static void ip6_dst_destroy(struct dst_entry *dst) 
{

	struct rt6_info *rt = (struct rt6_info *)dst;

	struct inet6_dev *idev = rt->rt6i_idev;

	struct dst_entry *from = dst->from;



	if (!(rt->dst.flags & DST_HOST))

		dst_destroy_metrics_generic(dst);
@@ -296,8 +297,8 @@ static void ip6_dst_destroy(struct dst_entry *dst) 
		in6_dev_put(idev);

	}



	if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from)

		dst_release(dst->from);

	dst->from = NULL;

	dst_release(from);



	if (rt6_has_peer(rt)) {

		struct inet_peer *peer = rt6_peer_ptr(rt);
@@ -1010,7 +1011,6 @@ struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_ori 


		rt->rt6i_gateway = ort->rt6i_gateway;

		rt->rt6i_flags = ort->rt6i_flags;

		rt6_clean_expires(rt);

		rt->rt6i_metric = 0;



		memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
@@ -1784,8 +1784,6 @@ static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, 
		if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) ==

		    (RTF_DEFAULT | RTF_ADDRCONF))

			rt6_set_from(rt, ort);

		else

			rt6_clean_expires(rt);

		rt->rt6i_metric = 0;



#ifdef CONFIG_IPV6_SUBTREES

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