BUG: unable to handle kernel NULL pointer dereference at .. (linux 3.13)

Mon Feb 4 17:50:46 CET 2019

Hi,

I'm trying to make WG work on Ubuntu 14.04.5, but got a driver bug 
apparently.

WG was installed this way: sudo add-apt-repository 
ppa:wireguard/wireguard && sudo apt update && sudo apt install wireguard

Then, the following commands were executed (mixed with syslog output):

$ lsb_release -a
Distributor ID:    Ubuntu
Description:    Ubuntu 14.04.5 LTS
Release:    14.04
Codename:    trusty

$ uname -a
Linux l 3.13.0-165-generic #215-Ubuntu SMP Wed Jan 16 11:46:47 UTC 2019 
x86_64 x86_64 x86_64 GNU/Linux

$ apt search wireguard
wireguard/trusty,now 0.0.20190123-wg1~trusty all [installed]
wireguard-dkms/trusty,now 0.0.20190123-wg1~trusty all [installed,automatic]
wireguard-tools/trusty,now 0.0.20190123-wg1~trusty amd64 
[installed,automatic]

$ wg genkey | tee privatekey | wg pubkey > publickey

$ sudo ip link add dev wg0 type wireguard

Feb  4 13:20:37 l kernel: [  248.082139] wireguard: module verification 
failed: signature and/or  required key missing - tainting kernel
Feb  4 13:20:37 l kernel: [  248.082815] wireguard: WireGuard 
0.0.20190123 loaded. See www.wireguard.com for information.
Feb  4 13:20:37 l kernel: [  248.082816] wireguard: Copyright (C) 
2015-2019 Jason A. Donenfeld <Jason at zx2c4.com>. All Rights Reserved.

$ sudo ip addr add 10.0.0.1/24 dev wg0
$ sudo wg set wg0 listen-port 500 private-key ./privatekey
$ sudo ip link set wg0 up

Feb  4 13:22:12 l kernel: [  342.791370] BUG: unable to handle kernel 
NULL pointer dereference at 0000000000000018
Feb  4 13:22:12 l kernel: [  342.791635] IP: [<ffffffffa036d7ec>] 
wg_socket_init+0x13c/0x3f0 [wireguard]
Feb  4 13:22:12 l kernel: [  342.791861] PGD 80000000b2899067 PUD 
b2a0d067 PMD 0
Feb  4 13:22:12 l kernel: [  342.792043] Oops: 0000 [#1] SMP
Feb  4 13:22:12 l kernel: [  342.792162] Modules linked in: 
wireguard(OX) ip_tunnel iptable_mangle xt_nat iptable_nat nf_nat_ipv4 
ipt_REJECT xt_tcpmss xt_tcpudp xt_LOG xt_limit nf_conntrack_ipv4 
nf_defrag_ipv4 xt_owner xt_recent xt_set xt_conntrack iptable_filter 
ip_tables ip_set_hash_ip ip_set nfnetlink bridge stp llc intel_rapl 
e1000e x86_pkg_temp_thermal intel_powerclamp r8169 mii kvm_intel ptp 
gpio_ich ipmi_devintf lpc_ich pps_core joydev shpchp kvm 
crct10dif_pclmul ipmi_si crc32_pclmul ghash_clmulni_intel 
nf_conntrack_sip nf_conntrack_tftp xt_multiport x_tables nf_nat_ftp 
nf_nat nf_conntrack_ftp nf_conntrack coretemp lp nls_iso8859_1 parport 
dm_crypt raid10 raid456 async_raid6_recov async_memcpy async_pq 
async_xor xor async_tx raid6_pq raid0 multipath linear raid1 hid_generic 
aesni_intel snd_pcsp aes_x86_64 glue_helper snd_pcm lrw snd_page_alloc 
gf128mul snd_timer ablk_helper usbhid ahci snd cryptd soundcore libahci 
hid wmi mac_hid
Feb  4 13:22:12 l kernel: [  342.795383] CPU: 6 PID: 3154 Comm: ip 
Tainted: G           OX 3.13.0-165-generic #215-Ubuntu
Feb  4 13:22:12 l kernel: [  342.795650] Hardware name: IBM IBM System 
x3100 M4
Feb  4 13:22:12 l kernel: [  342.795957] task: ffff88021cb0b000 ti: 
ffff8800af964000 task.ti: ffff8800af964000
Feb  4 13:22:12 l kernel: [  342.796192] RIP: 0010:[<ffffffffa036d7ec>]  
[<ffffffffa036d7ec>] wg_socket_init+0x13c/0x3f0 [wireguard]
Feb  4 13:22:12 l kernel: [  342.796497] RSP: 0018:ffff8800af9656e0  
EFLAGS: 00010202
Feb  4 13:22:12 l kernel: [  342.796665] RAX: 0000000000000000 RBX: 
ffff88021b300880 RCX: 000000007fbae3ff
Feb  4 13:22:12 l kernel: [  342.796894] RDX: ffff88021b300880 RSI: 
ffff880221d7f980 RDI: ffffffff81cded00
Feb  4 13:22:12 l kernel: [  342.797120] RBP: ffff8800af965798 R08: 
ffff88023fd94690 R09: 0000000000000004
Feb  4 13:22:12 l kernel: [  342.797344] R10: ffff88023fd94688 R11: 
ffffc90004e0ca8c R12: 0000000000000065
Feb  4 13:22:12 l kernel: [  342.797568] R13: 0000000000000000 R14: 
ffff8800af96573c R15: 00000000000001f4
Feb  4 13:22:12 l kernel: [  342.797794] FS: 00007f34c4d92740(0000) 
GS:ffff88023fd80000(0000) knlGS:0000000000000000
Feb  4 13:22:12 l kernel: [  342.798050] CS:  0010 DS: 0000 ES: 0000 
CR0: 0000000080050033
Feb  4 13:22:12 l kernel: [  342.798230] CR2: 0000000000000018 CR3: 
00000000af87a000 CR4: 0000000000160770
Feb  4 13:22:12 l kernel: [  342.798455] Stack:
Feb  4 13:22:12 l kernel: [  342.798520]  ffff8800af965750 
ffff880221d7f980 0000000000000000 ffff88021b300880
Feb  4 13:22:12 l kernel: [  342.798784]  ffffffff8162bd01 
ffffffffa036c340 0000000000000002 0000000000000000
Feb  4 13:22:12 l kernel: [  342.799046]  0000000000000000 
0000000000000000 0000f40100000000 0000000a00000001
Feb  4 13:22:12 l kernel: [  342.799309] Call Trace:
Feb  4 13:22:12 l kernel: [  342.806648] [<ffffffff8162bd01>] ? 
skb_copy_and_csum_dev+0xb1/0xc0
Feb  4 13:22:12 l kernel: [  342.814226] [<ffffffffa036c340>] ? 
send6+0x340/0x340 [wireguard]
Feb  4 13:22:12 l kernel: [  342.821781] [<ffffffffa0367a2a>] 
wg_open+0x5a/0xe0 [wireguard]
Feb  4 13:22:12 l kernel: [  342.829201] [<ffffffff8163f942>] 
__dev_open+0xc2/0x140
Feb  4 13:22:12 l kernel: [  342.836477] [<ffffffff8163fc53>] 
__dev_change_flags+0xa3/0x180
Feb  4 13:22:12 l kernel: [  342.843676] [<ffffffff8163fd59>] 
dev_change_flags+0x29/0x60
Feb  4 13:22:12 l kernel: [  342.850884] [<ffffffff8164f176>] 
do_setlink+0x2f6/0x9a0
Feb  4 13:22:12 l kernel: [  342.857911] [<ffffffff8139c442>] ? 
nla_parse+0x32/0x120
Feb  4 13:22:12 l kernel: [  342.864767] [<ffffffff8164fd1a>] 
rtnl_newlink+0x3ba/0x620
Feb  4 13:22:12 l kernel: [  342.871445] [<ffffffff81161923>] ? 
__alloc_pages_nodemask+0x1a3/0xb90
Feb  4 13:22:12 l kernel: [  342.878020] [<ffffffff812e5f7e>] ? 
security_capable+0x1e/0x20
Feb  4 13:22:12 l kernel: [  342.884415] [<ffffffff81077e29>] ? 
ns_capable+0x29/0x50
Feb  4 13:22:12 l kernel: [  342.890633] [<ffffffff8164c718>] 
rtnetlink_rcv_msg+0x98/0x250
Feb  4 13:22:12 l kernel: [  342.896710] [<ffffffff811afc88>] ? 
__kmalloc_node_track_caller+0x58/0x2b0
Feb  4 13:22:12 l kernel: [  342.902695] [<ffffffff8162c98e>] ? 
__alloc_skb+0x7e/0x2b0
Feb  4 13:22:12 l kernel: [  342.908496] [<ffffffff8164c680>] ? 
rtnetlink_rcv+0x30/0x30
Feb  4 13:22:12 l kernel: [  342.914122] [<ffffffff8166b0ab>] 
netlink_rcv_skb+0xab/0xc0
Feb  4 13:22:12 l kernel: [  342.919616] [<ffffffff8164c678>] 
rtnetlink_rcv+0x28/0x30
Feb  4 13:22:12 l kernel: [  342.924963] [<ffffffff8166a7a0>] 
netlink_unicast+0xe0/0x1b0
Feb  4 13:22:12 l kernel: [  342.930172] [<ffffffff8166ab7e>] 
netlink_sendmsg+0x30e/0x680
Feb  4 13:22:12 l kernel: [  342.935225] [<ffffffff81623251>] 
sock_sendmsg+0x91/0xc0
Feb  4 13:22:12 l kernel: [  342.940134] [<ffffffff811bd526>] ? 
__mem_cgroup_commit_charge+0x156/0x3d0
Feb  4 13:22:12 l kernel: [  342.944970] [<ffffffff81622f2e>] ? 
move_addr_to_kernel.part.14+0x1e/0x60
Feb  4 13:22:12 l kernel: [  342.949771] [<ffffffff81623d81>] ? 
move_addr_to_kernel+0x21/0x30
Feb  4 13:22:12 l kernel: [  342.954457] [<ffffffff81623659>] 
___sys_sendmsg+0x389/0x3a0
Feb  4 13:22:12 l kernel: [  342.959123] [<ffffffff81621ecf>] ? 
sock_destroy_inode+0x2f/0x40
Feb  4 13:22:12 l kernel: [  342.963784] [<ffffffff817487d4>] ? 
__do_page_fault+0x214/0x570
Feb  4 13:22:12 l kernel: [  342.968464] [<ffffffff811dffdd>] ? 
dput+0xad/0x190
Feb  4 13:22:12 l kernel: [  342.973110] [<ffffffff811e94e4>] ? 
mntput+0x24/0x40
Feb  4 13:22:12 l kernel: [  342.977642] [<ffffffff811cab81>] ? 
__fput+0x181/0x260
Feb  4 13:22:12 l kernel: [  342.982066] [<ffffffff81624462>] 
__sys_sendmsg+0x42/0x80
Feb  4 13:22:12 l kernel: [  342.986430] [<ffffffff816244b2>] 
SyS_sendmsg+0x12/0x20
Feb  4 13:22:12 l kernel: [  342.990694] [<ffffffff8174d3bc>] 
system_call_fastpath+0x26/0x2b
Feb  4 13:22:12 l kernel: [  342.994897] Code: 7f 48 8b 78 20 e8 65 7e 
2b e1 48 8b bb 50 02 00 00 48 8b b5 50 ff ff ff 48 8d 95 60 ff ff ff e8 
8b dd 01 00 48 8b 05 9c 44 9b e1 <48> 83 78 18 00 0f 84 87 01 00 00 48 
8b 95 50 ff ff ff 48 8b bb
Feb  4 13:22:12 l kernel: [  343.008678] RIP [<ffffffffa036d7ec>] 
wg_socket_init+0x13c/0x3f0 [wireguard]
Feb  4 13:22:12 l kernel: [  343.013245]  RSP <ffff8800af9656e0>
Feb  4 13:22:12 l kernel: [  343.017746] CR2: 0000000000000018
Feb  4 13:22:12 l kernel: [  343.022234] ---[ end trace 7a6ac50ecd32399e 
]---

Any idea what could be the problem?

Regards,
Anatoli
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