OpenCloudOS-Kernel/drivers/net
Eric Dumazet 9981159fc3 wireguard: allowedips: fix use-after-free in root_remove_peer_lists
In the unlikely case a new node could not be allocated, we need to
remove @newnode from @peer->allowedips_list before freeing it.

syzbot reported:

BUG: KASAN: use-after-free in __list_del_entry_valid+0xdc/0xf5 lib/list_debug.c:54
Read of size 8 at addr ffff88809881a538 by task syz-executor.4/30133

CPU: 0 PID: 30133 Comm: syz-executor.4 Not tainted 5.5.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x32 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:639
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 __list_del_entry_valid+0xdc/0xf5 lib/list_debug.c:54
 __list_del_entry include/linux/list.h:132 [inline]
 list_del include/linux/list.h:146 [inline]
 root_remove_peer_lists+0x24f/0x4b0 drivers/net/wireguard/allowedips.c:65
 wg_allowedips_free+0x232/0x390 drivers/net/wireguard/allowedips.c:300
 wg_peer_remove_all+0xd5/0x620 drivers/net/wireguard/peer.c:187
 wg_set_device+0xd01/0x1350 drivers/net/wireguard/netlink.c:542
 genl_family_rcv_msg_doit net/netlink/genetlink.c:672 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:717 [inline]
 genl_rcv_msg+0x67d/0xea0 net/netlink/genetlink.c:734
 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
 genl_rcv+0x29/0x40 net/netlink/genetlink.c:745
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:672
 ____sys_sendmsg+0x753/0x880 net/socket.c:2343
 ___sys_sendmsg+0x100/0x170 net/socket.c:2397
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg net/socket.c:2437 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b399
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f99a9bcdc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f99a9bce6d4 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000020001340 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00000000000009ba R14: 00000000004cb2b8 R15: 0000000000000009

Allocated by task 30103:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3551
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:670 [inline]
 add+0x70a/0x1970 drivers/net/wireguard/allowedips.c:236
 wg_allowedips_insert_v4+0xf6/0x160 drivers/net/wireguard/allowedips.c:320
 set_allowedip drivers/net/wireguard/netlink.c:343 [inline]
 set_peer+0xfb9/0x1150 drivers/net/wireguard/netlink.c:468
 wg_set_device+0xbd4/0x1350 drivers/net/wireguard/netlink.c:591
 genl_family_rcv_msg_doit net/netlink/genetlink.c:672 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:717 [inline]
 genl_rcv_msg+0x67d/0xea0 net/netlink/genetlink.c:734
 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
 genl_rcv+0x29/0x40 net/netlink/genetlink.c:745
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:672
 ____sys_sendmsg+0x753/0x880 net/socket.c:2343
 ___sys_sendmsg+0x100/0x170 net/socket.c:2397
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg net/socket.c:2437 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 30103:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:335 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3757
 add+0x12d2/0x1970 drivers/net/wireguard/allowedips.c:266
 wg_allowedips_insert_v4+0xf6/0x160 drivers/net/wireguard/allowedips.c:320
 set_allowedip drivers/net/wireguard/netlink.c:343 [inline]
 set_peer+0xfb9/0x1150 drivers/net/wireguard/netlink.c:468
 wg_set_device+0xbd4/0x1350 drivers/net/wireguard/netlink.c:591
 genl_family_rcv_msg_doit net/netlink/genetlink.c:672 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:717 [inline]
 genl_rcv_msg+0x67d/0xea0 net/netlink/genetlink.c:734
 netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
 genl_rcv+0x29/0x40 net/netlink/genetlink.c:745
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:672
 ____sys_sendmsg+0x753/0x880 net/socket.c:2343
 ___sys_sendmsg+0x100/0x170 net/socket.c:2397
 __sys_sendmsg+0x105/0x1d0 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg net/socket.c:2437 [inline]
 __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809881a500
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 56 bytes inside of
 64-byte region [ffff88809881a500, ffff88809881a540)
The buggy address belongs to the page:
page:ffffea0002620680 refcount:1 mapcount:0 mapping:ffff8880aa400380 index:0x0
raw: 00fffe0000000200 ffffea000250b748 ffffea000254bac8 ffff8880aa400380
raw: 0000000000000000 ffff88809881a000 0000000100000020 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809881a400: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88809881a480: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
>ffff88809881a500: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                                        ^
 ffff88809881a580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88809881a600: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc

Fixes: e7096c131e ("net: WireGuard secure network tunnel")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: Jason A. Donenfeld <Jason@zx2c4.com>
Cc: wireguard@lists.zx2c4.com
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-02-05 14:14:18 +01:00
..
appletalk netdev: pass the stuck queue to the timeout handler 2019-12-12 21:38:57 -08:00
arcnet netdev: pass the stuck queue to the timeout handler 2019-12-12 21:38:57 -08:00
bonding bonding: rename AD_STATE_* to LACP_STATE_* 2019-12-26 13:09:37 -08:00
caif net: caif: replace BUG_ON with recovery code 2019-12-16 16:29:05 -08:00
can ioremap changes for 5.6 2020-01-27 13:03:00 -08:00
dsa net: dsa: mv88e6xxx: Add SERDES stats counters to all 6390 family members 2020-01-20 10:32:03 +01:00
ethernet net: sgi: ioc3-eth: Remove leftover free_irq() 2020-02-05 13:53:54 +01:00
fddi Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-01-28 16:02:33 -08:00
fjes Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-01-28 16:02:33 -08:00
hamradio Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-12-22 15:15:05 -08:00
hippi
hyperv hv_netvsc: Add XDP support 2020-01-25 10:43:19 +01:00
ieee802154 drivers: net: Fix Kconfig indentation, continued 2019-11-21 11:54:09 -08:00
ipvlan
netdevsim netdevsim: fix ptr_ret.cocci warnings 2020-02-05 13:55:32 +01:00
phy Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-02-04 13:32:20 +00:00
plip
ppp pptp: support sockets bound to an interface 2020-01-15 23:13:09 +01:00
slip Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-01-26 10:40:21 +01:00
team
usb r8152: Add MAC passthrough support to new device 2020-02-04 11:58:10 +01:00
vmxnet3 vmxnet3: Remove always false conditional statement 2020-01-08 16:07:21 -08:00
wan Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-01-28 16:02:33 -08:00
wimax netdev: pass the stuck queue to the timeout handler 2019-12-12 21:38:57 -08:00
wireguard wireguard: allowedips: fix use-after-free in root_remove_peer_lists 2020-02-05 14:14:18 +01:00
wireless proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
xen-netback net: xen-netback: hash.c: Use built-in RCU list checking 2020-01-17 10:57:22 +01:00
Kconfig USB/Thunderbolt/PHY driver updates for 5.6-rc1 2020-01-29 10:09:44 -08:00
LICENSE.SRC
Makefile USB/Thunderbolt/PHY driver updates for 5.6-rc1 2020-01-29 10:09:44 -08:00
Space.c
dummy.c
eql.c
geneve.c treewide: Use sizeof_field() macro 2019-12-09 10:36:44 -08:00
gtp.c gtp: use __GFP_NOWARN to avoid memalloc warning 2020-02-04 12:38:50 +01:00
ifb.c
loopback.c
macsec.c net: macsec: PN wrap callback 2020-01-14 11:31:41 -08:00
macvlan.c Merge ra.kernel.org:/pub/scm/linux/kernel/git/netdev/net 2020-01-19 22:10:04 +01:00
macvtap.c
mdio.c
mii.c
net_failover.c
netconsole.c
nlmon.c
ntb_netdev.c
rionet.c
sb1000.c
sungem_phy.c
tap.c net: tap: use skb_list_walk_safe helper for gso segments 2020-01-08 15:19:55 -08:00
thunderbolt.c
tun.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-01-26 10:40:21 +01:00
veth.c bpf, xdp: Remove no longer required rcu_read_{un}lock() 2020-01-27 11:16:25 +01:00
virtio_net.c bpf, xdp: virtio_net use access ptr macro for xdp enable check 2020-01-27 11:16:25 +01:00
vrf.c
vsockmon.c
vxlan.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-01-09 12:13:43 -08:00
xen-netfront.c