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Commit 5d944c64 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

gen_estimator: deadlock fix 



One of my test machine got a deadlock during "tc" sessions,
adding/deleting classes & filters, using traffic estimators.

After some analysis, I believe we have a potential use after free case
in est_timer() :

spin_lock(e->stats_lock); << HERE >>
read_lock(&est_lock);
if (e->bstats == NULL)   << TEST >>
	goto skip;

Test is done a bit late, because after estimator is killed, and before
rcu grace period elapsed, we might already have freed/reuse memory where
e->stats_locks points to (some qdisc->q.lock)

A possible fix is to respect a rcu grace period at Qdisc dismantle time.

On 64bit, sizeof(struct Qdisc) is exactly 192 bytes. Adding 16 bytes to
it (for struct rcu_head) is a problem because it might change
performance, given QDISC_ALIGNTO is 32 bytes.

This is why I also change QDISC_ALIGNTO to 64 bytes, to satisfy most
current alignment requirements.

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d4fc6dbb

include/net/pkt_sched.h

+1 −1
Original line number Diff line number Diff line
@@ -12,7 +12,7 @@ struct qdisc_walker { 
	int	(*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);

};



#define QDISC_ALIGNTO		32

#define QDISC_ALIGNTO		64

#define QDISC_ALIGN(len)	(((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))



static inline void *qdisc_priv(struct Qdisc *q)

include/net/sch_generic.h

+1 −0
Original line number Diff line number Diff line
@@ -73,6 +73,7 @@ struct Qdisc { 
	struct sk_buff_head	q;

	struct gnet_stats_basic_packed bstats;

	struct gnet_stats_queue	qstats;

	struct rcu_head     rcu_head;

};



struct Qdisc_class_ops {

net/sched/sch_generic.c

+13 −2
Original line number Diff line number Diff line
@@ -528,7 +528,7 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, 
	unsigned int size;

	int err = -ENOBUFS;



	/* ensure that the Qdisc and the private data are 32-byte aligned */

	/* ensure that the Qdisc and the private data are 64-byte aligned */

	size = QDISC_ALIGN(sizeof(*sch));

	size += ops->priv_size + (QDISC_ALIGNTO - 1);
@@ -590,6 +590,13 @@ void qdisc_reset(struct Qdisc *qdisc) 
}

EXPORT_SYMBOL(qdisc_reset);



static void qdisc_rcu_free(struct rcu_head *head)

{

	struct Qdisc *qdisc = container_of(head, struct Qdisc, rcu_head);



	kfree((char *) qdisc - qdisc->padded);

}



void qdisc_destroy(struct Qdisc *qdisc)

{

	const struct Qdisc_ops  *ops = qdisc->ops;
@@ -613,7 +620,11 @@ void qdisc_destroy(struct Qdisc *qdisc) 
	dev_put(qdisc_dev(qdisc));



	kfree_skb(qdisc->gso_skb);

	kfree((char *) qdisc - qdisc->padded);

	/*

	 * gen_estimator est_timer() might access qdisc->q.lock,

	 * wait a RCU grace period before freeing qdisc.

	 */

	call_rcu(&qdisc->rcu_head, qdisc_rcu_free);

}

EXPORT_SYMBOL(qdisc_destroy);