A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 03:01:39 -04:00
Code Issues Projects Releases Packages Wiki Activity

netfilter: nf_conntrack: nf_conntrack_alloc() fixes

Browse source 
When a slab cache uses SLAB_DESTROY_BY_RCU, we must be careful when allocating
objects, since slab allocator could give a freed object still used by lockless
readers.

In particular, nf_conntrack RCU lookups rely on ct->tuplehash[xxx].hnnode.next
being always valid (ie containing a valid 'nulls' value, or a valid pointer to next
object in hash chain.)

kmem_cache_zalloc() setups object with NULL values, but a NULL value is not valid
for ct->tuplehash[xxx].hnnode.next.

Fix is to call kmem_cache_alloc() and do the zeroing ourself.

As spotted by Patrick, we also need to make sure lookup keys are committed to
memory before setting refcount to 1, or a lockless reader could get a reference
on the old version of the object. Its key re-check could then pass the barrier.

Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: Patrick McHardy <[email protected]>
This commit is contained in:
Eric Dumazet 2009-07-16 14:03:40 +02:00 • committed by Patrick McHardy
commit 941297f443
2 changed files with 24 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

21
net/netfilter/nf_conntrack_core.c
View file

@ -561,23 +561,38 @@ struct nf_conn *nf_conntrack_alloc(struct net *net,
}
}
ct = kmem_cache_zalloc(nf_conntrack_cachep, gfp);
/*
* Do not use kmem_cache_zalloc(), as this cache uses
* SLAB_DESTROY_BY_RCU.
*/
ct = kmem_cache_alloc(nf_conntrack_cachep, gfp);
if (ct == NULL) {
pr_debug("nf_conntrack_alloc: Can't alloc conntrack.\n");
atomic_dec(&net->ct.count);
return ERR_PTR(-ENOMEM);
}
/*
* Let ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.next
* and ct->tuplehash[IP_CT_DIR_REPLY].hnnode.next unchanged.
*/
memset(&ct->tuplehash[IP_CT_DIR_MAX], 0,
sizeof(*ct) - offsetof(struct nf_conn, tuplehash[IP_CT_DIR_MAX]));
spin_lock_init(&ct->lock);
atomic_set(&ct->ct_general.use, 1);
ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig;
ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL;
ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl;
ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev = NULL;
/* Don't set timer yet: wait for confirmation */
setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct);
#ifdef CONFIG_NET_NS
ct->ct_net = net;
#endif
/*
* changes to lookup keys must be done before setting refcnt to 1
*/
smp_wmb();
atomic_set(&ct->ct_general.use, 1);
return ct;
}
EXPORT_SYMBOL_GPL(nf_conntrack_alloc);