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| author |   Florian Westphal <fw@strlen.de> | 2017-11-30 21:08:05 +0100 |
|---|---|---|
| committer |   Pablo Neira Ayuso <pablo@netfilter.org> | 2018-01-08 18:01:04 +0100 |
| commit | a778a15fa5cf5f632cd55845f548189a29e9b57b (patch) | |
| tree | e9259d75cb6a7342e4cacf2d982ff6ef812a8b6d /net/netfilter/ipset/ip_set_hash_gen.h | |
| parent | netfilter: ipset: use nfnl_mutex_is_locked (diff) | |
| download | linux-dev-a778a15fa5cf5f632cd55845f548189a29e9b57b.tar.xz linux-dev-a778a15fa5cf5f632cd55845f548189a29e9b57b.zip | |
netfilter: ipset: add resched points during set listing
When sets are extremely large we can get softlockup during ipset -L.
We could fix this by adding cond_resched_rcu() at the right location
during iteration, but this only works if RCU nesting depth is 1.
At this time entire variant->list() is called under under rcu_read_lock_bh.
This used to be a read_lock_bh() but as rcu doesn't really lock anything,
it does not appear to be needed, so remove it (ipset increments set
reference count before this, so a set deletion should not be possible).
Reported-by: Li Shuang <shuali@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to '')
| -rw-r--r-- | net/netfilter/ipset/ip_set_hash_gen.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/netfilter/ipset/ip_set_hash_gen.h b/net/netfilter/ipset/ip_set_hash_gen.h index efffc8eabafe..8ef079db7d34 100644 --- a/net/netfilter/ipset/ip_set_hash_gen.h +++ b/net/netfilter/ipset/ip_set_hash_gen.h @@ -1143,6 +1143,7 @@ mtype_list(const struct ip_set *set, rcu_read_lock(); for (; cb->args[IPSET_CB_ARG0] < jhash_size(t->htable_bits); cb->args[IPSET_CB_ARG0]++) { + cond_resched_rcu(); incomplete = skb_tail_pointer(skb); n = rcu_dereference(hbucket(t, cb->args[IPSET_CB_ARG0])); pr_debug("cb->arg bucket: %lu, t %p n %p\n", |