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authorJulian Anastasov <ja@ssi.bg>2019-06-04 21:56:35 +0300
committerPaul Gortmaker <paul.gortmaker@windriver.com>2019-09-16 12:21:48 -0400
commit86968937f41ff1ca93b5bb856c007185a4eba697 (patch)
treeb70938e6872109525b1820d4e1585681783cfb07
parent98d726f8a5d8b6cc272d0c8f6d3995ca98f37d18 (diff)
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ipvs: defer hook registration to avoid leaks
commit cf47a0b882a4e5f6b34c7949d7b293e9287f1972 upstream. syzkaller reports for memory leak when registering hooks [1] As we moved the nf_unregister_net_hooks() call into __ip_vs_dev_cleanup(), defer the nf_register_net_hooks() call, so that hooks are allocated and freed from same pernet_operations (ipvs_core_dev_ops). [1] BUG: memory leak unreferenced object 0xffff88810acd8a80 (size 96): comm "syz-executor073", pid 7254, jiffies 4294950560 (age 22.250s) hex dump (first 32 bytes): 02 00 00 00 00 00 00 00 50 8b bb 82 ff ff ff ff ........P....... 00 00 00 00 00 00 00 00 00 77 bb 82 ff ff ff ff .........w...... backtrace: [<0000000013db61f1>] kmemleak_alloc_recursive include/linux/kmemleak.h:55 [inline] [<0000000013db61f1>] slab_post_alloc_hook mm/slab.h:439 [inline] [<0000000013db61f1>] slab_alloc_node mm/slab.c:3269 [inline] [<0000000013db61f1>] kmem_cache_alloc_node_trace+0x15b/0x2a0 mm/slab.c:3597 [<000000001a27307d>] __do_kmalloc_node mm/slab.c:3619 [inline] [<000000001a27307d>] __kmalloc_node+0x38/0x50 mm/slab.c:3627 [<0000000025054add>] kmalloc_node include/linux/slab.h:590 [inline] [<0000000025054add>] kvmalloc_node+0x4a/0xd0 mm/util.c:431 [<0000000050d1bc00>] kvmalloc include/linux/mm.h:637 [inline] [<0000000050d1bc00>] kvzalloc include/linux/mm.h:645 [inline] [<0000000050d1bc00>] allocate_hook_entries_size+0x3b/0x60 net/netfilter/core.c:61 [<00000000e8abe142>] nf_hook_entries_grow+0xae/0x270 net/netfilter/core.c:128 [<000000004b94797c>] __nf_register_net_hook+0x9a/0x170 net/netfilter/core.c:337 [<00000000d1545cbc>] nf_register_net_hook+0x34/0xc0 net/netfilter/core.c:464 [<00000000876c9b55>] nf_register_net_hooks+0x53/0xc0 net/netfilter/core.c:480 [<000000002ea868e0>] __ip_vs_init+0xe8/0x170 net/netfilter/ipvs/ip_vs_core.c:2280 [<000000002eb2d451>] ops_init+0x4c/0x140 net/core/net_namespace.c:130 [<000000000284ec48>] setup_net+0xde/0x230 net/core/net_namespace.c:316 [<00000000a70600fa>] copy_net_ns+0xf0/0x1e0 net/core/net_namespace.c:439 [<00000000ff26c15e>] create_new_namespaces+0x141/0x2a0 kernel/nsproxy.c:107 [<00000000b103dc79>] copy_namespaces+0xa1/0xe0 kernel/nsproxy.c:165 [<000000007cc008a2>] copy_process.part.0+0x11fd/0x2150 kernel/fork.c:2035 [<00000000c344af7c>] copy_process kernel/fork.c:1800 [inline] [<00000000c344af7c>] _do_fork+0x121/0x4f0 kernel/fork.c:2369 Reported-by: syzbot+722da59ccb264bc19910@syzkaller.appspotmail.com Fixes: 719c7d563c17 ("ipvs: Fix use-after-free in ip_vs_in") Signed-off-by: Julian Anastasov <ja@ssi.bg> Acked-by: Simon Horman <horms@verge.net.au> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
-rw-r--r--net/netfilter/ipvs/ip_vs_core.c21
1 files changed, 14 insertions, 7 deletions
diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index 62c0e80dcd71..a71f777d1353 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -2218,7 +2218,6 @@ static const struct nf_hook_ops ip_vs_ops[] = {
static int __net_init __ip_vs_init(struct net *net)
{
struct netns_ipvs *ipvs;
- int ret;
ipvs = net_generic(net, ip_vs_net_id);
if (ipvs == NULL)
@@ -2250,17 +2249,11 @@ static int __net_init __ip_vs_init(struct net *net)
if (ip_vs_sync_net_init(ipvs) < 0)
goto sync_fail;
- ret = nf_register_net_hooks(net, ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
- if (ret < 0)
- goto hook_fail;
-
return 0;
/*
* Error handling
*/
-hook_fail:
- ip_vs_sync_net_cleanup(ipvs);
sync_fail:
ip_vs_conn_net_cleanup(ipvs);
conn_fail:
@@ -2290,6 +2283,19 @@ static void __net_exit __ip_vs_cleanup(struct net *net)
net->ipvs = NULL;
}
+static int __net_init __ip_vs_dev_init(struct net *net)
+{
+ int ret;
+
+ ret = nf_register_net_hooks(net, ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
+ if (ret < 0)
+ goto hook_fail;
+ return 0;
+
+hook_fail:
+ return ret;
+}
+
static void __net_exit __ip_vs_dev_cleanup(struct net *net)
{
struct netns_ipvs *ipvs = net_ipvs(net);
@@ -2309,6 +2315,7 @@ static struct pernet_operations ipvs_core_ops = {
};
static struct pernet_operations ipvs_core_dev_ops = {
+ .init = __ip_vs_dev_init,
.exit = __ip_vs_dev_cleanup,
};