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Gao feng 45c2aff645 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>
2013-12-17 23:19:03 +01:00
..
9p Nothing really exciting: some groundwork for changing virtio endian, and 2013-11-15 13:28:47 +09:00
802 mrp: add periodictimer to allow retries when packets get lost 2013-09-23 16:53:52 -04:00
8021q Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-11-14 16:30:30 +09:00
appletalk net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
atm net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
ax25 net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
batman-adv batman-adv: generalize batman-adv icmp packet handling 2013-10-23 17:03:47 +02:00
bluetooth Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem 2013-11-21 10:26:17 -05:00
bridge br: fix use of ->rx_handler_data in code executed on non-rx_handler path 2013-12-06 15:41:40 -05:00
caif net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
can Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2013-11-15 16:47:22 -08:00
ceph net: 8021q/bluetooth/bridge/can/ceph: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
core neigh: Netlink notification for administrative NUD state change 2013-12-17 16:14:35 -05:00
dcb
dccp ipv6: do not erase dst address with flow label destination 2013-12-10 22:51:00 -05:00
decnet netfilter: pass hook ops to hookfn 2013-10-14 11:29:31 +02:00
dns_resolver net: strict_strtoul is obsolete, use kstrtoul instead 2013-07-12 16:09:14 -07:00
dsa net: dsa: inherit addr_assign_type along with dev_addr 2013-09-03 20:57:49 -04:00
ethernet ethernet: use likely() for common Ethernet encap 2013-09-30 21:52:53 -07:00
hsr net/hsr: Support iproute print_opt ('ip -details ...') 2013-11-30 12:48:14 -05:00
ieee802154 genetlink: make multicast groups const, prevent abuse 2013-11-19 16:39:06 -05:00
ipv4 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2013-12-17 15:06:20 -05:00
ipv6 netfilter: SYNPROXY target: restrict to INPUT/FORWARD 2013-12-11 11:30:25 +01:00
ipx net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
irda net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
iucv net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
key net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
l2tp ipv6: do not erase dst address with flow label destination 2013-12-10 22:51:00 -05:00
lapb net/lapb: re-send packets on timeout 2013-09-23 16:52:45 -04:00
llc net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
mac80211 mac80211: check csa wiphy flag in ibss before switching 2013-12-02 11:54:13 +01:00
mac802154 6lowpan: set and use mac_len for mac header length 2013-10-30 17:18:46 -04:00
mpls ipip: add GSO/TSO support 2013-10-19 19:36:19 -04:00
netfilter netfilter: nfnetlink_log: unset nf_loggers for netns when unloading module 2013-12-17 23:19:03 +01:00
netlabel genetlink: only pass array to genl_register_family_with_ops() 2013-11-19 16:39:05 -05:00
netlink genetlink/pmcraid: use proper genetlink multicast API 2013-11-28 18:26:30 -05:00
netrom net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
nfc net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-11-19 15:50:47 -08:00
packet packet: fix send path when running with proto == 0 2013-12-09 20:09:20 -05:00
phonet Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-11-19 15:50:47 -08:00
rds rds: prevent BUG_ON triggered on congestion update to loopback 2013-12-03 11:54:18 -05:00
rfkill net: rfkill: gpio: add ACPI support 2013-10-28 15:05:25 +01:00
rose net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
rxrpc net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
sched sch_tbf: use do_div() for 64-bit divide 2013-12-11 22:53:26 -05:00
sctp sctp: loading sctp when load sctp_probe 2013-12-16 20:04:27 -05:00
sunrpc NFS client bugfixes 2013-12-05 13:05:48 -08:00
tipc tipc: protect handler_enabled variable with qitem_lock spin lock 2013-12-10 22:35:49 -05:00
unix net: unix: allow bind to fail on mutex lock 2013-12-17 15:04:42 -05:00
vmw_vsock net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
wimax wimax: remove dead code 2013-11-21 13:09:42 -05:00
wireless cfg80211: disable CSA for all drivers 2013-12-02 11:53:44 +01:00
x25 net: rework recvmsg handler msg_name and msg_namelen logic 2013-11-20 21:52:30 -05:00
xfrm net: move pskb_put() to core code 2013-11-07 19:28:58 -05:00
compat.c net: clamp ->msg_namelen instead of returning an error 2013-11-29 16:12:52 -05:00
Kconfig kernel: remove CONFIG_USE_GENERIC_SMP_HELPERS cleanly 2013-11-21 16:42:27 -08:00
Makefile net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0) 2013-11-03 23:20:14 -05:00
nonet.c
socket.c net: clamp ->msg_namelen instead of returning an error 2013-11-29 16:12:52 -05:00
sysctl_net.c net: Update the sysctl permissions handler to test effective uid/gid 2013-10-07 15:57:56 -04:00