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authorTaehee Yoo <ap420073@gmail.com>2018-11-05 03:44:11 +0900
committerPablo Neira Ayuso <pablo@netfilter.org>2018-11-12 15:48:35 +0100
commit31568ec09ea02a050249921698c9729419539cce (patch)
treeb060e5bff15c9b09758ecd8716d573ca5a4b4ba2 /net/netfilter
parentfd3e71a9f71e232181a225301a75936373636ccc (diff)
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netfilter: nf_conncount: fix list_del corruption in conn_free
nf_conncount_tuple is an element of nft_connlimit and that is deleted by conn_free(). Elements can be deleted by both GC routine and data path functions (nf_conncount_lookup, nf_conncount_add) and they call conn_free() to free elements. But conn_free() only protects lists, not each element. So that list_del corruption could occurred. The conn_free() doesn't check whether element is already deleted. In order to protect elements, dead flag is added. If an element is deleted, dead flag is set. The only conn_free() can delete elements so that both list lock and dead flag are enough to protect it. test commands: %nft add table ip filter %nft add chain ip filter input { type filter hook input priority 0\; } %nft add rule filter input meter test { ip id ct count over 2 } counter splat looks like: [ 1779.495778] list_del corruption, ffff8800b6e12008->prev is LIST_POISON2 (dead000000000200) [ 1779.505453] ------------[ cut here ]------------ [ 1779.506260] kernel BUG at lib/list_debug.c:50! [ 1779.515831] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI [ 1779.516772] CPU: 0 PID: 33 Comm: kworker/0:2 Not tainted 4.19.0-rc6+ #22 [ 1779.516772] Workqueue: events_power_efficient nft_rhash_gc [nf_tables_set] [ 1779.516772] RIP: 0010:__list_del_entry_valid+0xd8/0x150 [ 1779.516772] Code: 39 48 83 c4 08 b8 01 00 00 00 5b 5d c3 48 89 ea 48 c7 c7 00 c3 5b 98 e8 0f dc 40 ff 0f 0b 48 c7 c7 60 c3 5b 98 e8 01 dc 40 ff <0f> 0b 48 c7 c7 c0 c3 5b 98 e8 f3 db 40 ff 0f 0b 48 c7 c7 20 c4 5b [ 1779.516772] RSP: 0018:ffff880119127420 EFLAGS: 00010286 [ 1779.516772] RAX: 000000000000004e RBX: dead000000000200 RCX: 0000000000000000 [ 1779.516772] RDX: 000000000000004e RSI: 0000000000000008 RDI: ffffed0023224e7a [ 1779.516772] RBP: ffff88011934bc10 R08: ffffed002367cea9 R09: ffffed002367cea9 [ 1779.516772] R10: 0000000000000001 R11: ffffed002367cea8 R12: ffff8800b6e12008 [ 1779.516772] R13: ffff8800b6e12010 R14: ffff88011934bc20 R15: ffff8800b6e12008 [ 1779.516772] FS: 0000000000000000(0000) GS:ffff88011b200000(0000) knlGS:0000000000000000 [ 1779.516772] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1779.516772] CR2: 00007fc876534010 CR3: 000000010da16000 CR4: 00000000001006f0 [ 1779.516772] Call Trace: [ 1779.516772] conn_free+0x9f/0x2b0 [nf_conncount] [ 1779.516772] ? nf_ct_tmpl_alloc+0x2a0/0x2a0 [nf_conntrack] [ 1779.516772] ? nf_conncount_add+0x520/0x520 [nf_conncount] [ 1779.516772] ? do_raw_spin_trylock+0x1a0/0x1a0 [ 1779.516772] ? do_raw_spin_trylock+0x10/0x1a0 [ 1779.516772] find_or_evict+0xe5/0x150 [nf_conncount] [ 1779.516772] nf_conncount_gc_list+0x162/0x360 [nf_conncount] [ 1779.516772] ? nf_conncount_lookup+0xee0/0xee0 [nf_conncount] [ 1779.516772] ? _raw_spin_unlock_irqrestore+0x45/0x50 [ 1779.516772] ? trace_hardirqs_off+0x6b/0x220 [ 1779.516772] ? trace_hardirqs_on_caller+0x220/0x220 [ 1779.516772] nft_rhash_gc+0x16b/0x540 [nf_tables_set] [ ... ] Fixes: 5c789e131cbb ("netfilter: nf_conncount: Add list lock and gc worker, and RCU for init tree search") Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nf_conncount.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/net/netfilter/nf_conncount.c b/net/netfilter/nf_conncount.c
index 71b1f4f99580..cb33709138df 100644
--- a/net/netfilter/nf_conncount.c
+++ b/net/netfilter/nf_conncount.c
@@ -49,6 +49,7 @@ struct nf_conncount_tuple {
struct nf_conntrack_zone zone;
int cpu;
u32 jiffies32;
+ bool dead;
struct rcu_head rcu_head;
};
@@ -106,6 +107,7 @@ nf_conncount_add(struct nf_conncount_list *list,
conn->zone = *zone;
conn->cpu = raw_smp_processor_id();
conn->jiffies32 = (u32)jiffies;
+ conn->dead = false;
spin_lock_bh(&list->list_lock);
if (list->dead == true) {
kmem_cache_free(conncount_conn_cachep, conn);
@@ -134,12 +136,13 @@ static bool conn_free(struct nf_conncount_list *list,
spin_lock_bh(&list->list_lock);
- if (list->count == 0) {
+ if (conn->dead) {
spin_unlock_bh(&list->list_lock);
- return free_entry;
+ return free_entry;
}
list->count--;
+ conn->dead = true;
list_del_rcu(&conn->node);
if (list->count == 0)
free_entry = true;