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authorGao feng <gaofeng@cn.fujitsu.com>2013-12-16 14:59:22 +0800
committerPablo Neira Ayuso <pablo@netfilter.org>2013-12-17 23:19:03 +0100
commit45c2aff645c82da7b1574dad5062993cf451c699 (patch)
tree51976d8cda5fa2ab9874ccda142d235362ceebf9 /net
parenta7c12639bdf571a09578aed626875848d209d24f (diff)
netfilter: nfnetlink_log: unset nf_loggers for netns when unloading module
Steven Rostedt and Arnaldo Carvalho de Melo reported a panic when access the files /proc/sys/net/netfilter/nf_log/*. This problem will occur when we do: echo nfnetlink_log > /proc/sys/net/netfilter/nf_log/any_file rmmod nfnetlink_log and then access the files. Since the nf_loggers of netns hasn't been unset, it will point to the memory that has been freed. This bug is introduced by commit 9368a53c ("netfilter: nfnetlink_log: add net namespace support for nfnetlink_log"). [17261.822047] BUG: unable to handle kernel paging request at ffffffffa0d49090 [17261.822056] IP: [<ffffffff8157aba0>] nf_log_proc_dostring+0xf0/0x1d0 [...] [17261.822226] Call Trace: [17261.822235] [<ffffffff81297b98>] ? security_capable+0x18/0x20 [17261.822240] [<ffffffff8106fa09>] ? ns_capable+0x29/0x50 [17261.822247] [<ffffffff8163d25f>] ? net_ctl_permissions+0x1f/0x90 [17261.822254] [<ffffffff81216613>] proc_sys_call_handler+0xb3/0xc0 [17261.822258] [<ffffffff81216651>] proc_sys_read+0x11/0x20 [17261.822265] [<ffffffff811a80de>] vfs_read+0x9e/0x170 [17261.822270] [<ffffffff811a8c09>] SyS_read+0x49/0xa0 [17261.822276] [<ffffffff810e6496>] ? __audit_syscall_exit+0x1f6/0x2a0 [17261.822283] [<ffffffff81656e99>] system_call_fastpath+0x16/0x1b [17261.822285] Code: cc 81 4d 63 e4 4c 89 45 88 48 89 4d 90 e8 19 03 0d 00 4b 8b 84 e5 28 08 00 00 48 8b 4d 90 4c 8b 45 88 48 85 c0 0f 84 a8 00 00 00 <48> 8b 40 10 48 89 43 08 48 89 df 4c 89 f2 31 f6 e8 4b 35 af ff [17261.822329] RIP [<ffffffff8157aba0>] nf_log_proc_dostring+0xf0/0x1d0 [17261.822334] RSP <ffff880274d3fe28> [17261.822336] CR2: ffffffffa0d49090 [17261.822340] ---[ end trace a14ce54c0897a90d ]--- Reported-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Reported-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/nfnetlink_log.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index 3c4b69e5fe17..a155d19a225e 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -1053,6 +1053,7 @@ static void __net_exit nfnl_log_net_exit(struct net *net)
#ifdef CONFIG_PROC_FS
remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter);
#endif
+ nf_log_unset(net, &nfulnl_logger);
}
static struct pernet_operations nfnl_log_net_ops = {