* KASAN: stack-out-of-bounds Read in __neigh_create
@ 2018-07-05 4:59 syzbot
2018-07-05 16:17 ` Dmitry Vyukov
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2018-07-05 4:59 UTC (permalink / raw)
To: adobriyan, davem, dsa, edumazet, fw, keescook, linux-kernel,
netdev, roopa, syzkaller-bugs, w.bumiller
Hello,
syzbot found the following crash on:
HEAD commit: 2bdea157b999 Merge branch 'sctp-fully-support-for-dscp-and..
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11d40858400000
kernel config: https://syzkaller.appspot.com/x/.config?x=f62553dc846b0692
dashboard link: https://syzkaller.appspot.com/bug?extid=4dcaeea39647ed97d4c1
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=174aae68400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=120a0a1c400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4dcaeea39647ed97d4c1@syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready
8021q: adding VLAN 0 to HW filter on device team0
==================================================================
BUG: KASAN: stack-out-of-bounds in __neigh_create+0x1e93/0x2080
net/core/neighbour.c:522
Read of size 8 at addr ffff8801d4832220 by task kworker/1:2/2005
CPU: 1 PID: 2005 Comm: kworker/1:2 Not tainted 4.18.0-rc3+ #45
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
------------[ cut here ]------------
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
do_IRQ(): syz-executor810 has overflown the kernel stack
(cur:ffff8801d6450000,sp:ffff8801ce2cbd68,irq stk
top-bottom:ffff8801dae00080-ffff8801dae08000,exception stk
top-bottom:fffffe0000007080-fffffe0000011000,ip:lock_release+0x87/0xa30)
WARNING: CPU: 0 PID: 4713 at arch/x86/kernel/irq_64.c:63
stack_overflow_check arch/x86/kernel/irq_64.c:60 [inline]
WARNING: CPU: 0 PID: 4713 at arch/x86/kernel/irq_64.c:63
handle_irq+0x1fb/0x2e7 arch/x86/kernel/irq_64.c:72
Kernel panic - not syncing: panic_on_warn set ...
print_address_description+0x6c/0x20b mm/kasan/report.c:256
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
__neigh_create+0x1e93/0x2080 net/core/neighbour.c:522
ip6_finish_output2+0xa5d/0x2820 net/ipv6/ip6_output.c:117
ip6_finish_output+0x5fe/0xbc0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:276 [inline]
ip6_output+0x234/0x9d0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:444 [inline]
NF_HOOK include/linux/netfilter.h:287 [inline]
ndisc_send_skb+0x100d/0x1570 net/ipv6/ndisc.c:491
ndisc_send_ns+0x3c1/0x8d0 net/ipv6/ndisc.c:633
addrconf_dad_work+0xbf2/0x1310 net/ipv6/addrconf.c:4061
process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
kthread+0x345/0x410 kernel/kthread.c:240
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
CPU: 0 PID: 4713 Comm: syz-executor810 Not tainted 4.18.0-rc3+ #45
Allocated by task 4511:
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
Call Trace:
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
<IRQ>
__do_kmalloc mm/slab.c:3718 [inline]
__kmalloc_track_caller+0x14a/0x760 mm/slab.c:3733
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
kmemdup+0x24/0x50 mm/util.c:118
kmemdup include/linux/string.h:418 [inline]
neigh_parms_alloc+0xea/0x6b0 net/core/neighbour.c:1492
ipv6_add_dev+0x3ec/0x13b0 net/ipv6/addrconf.c:392
panic+0x238/0x4e7 kernel/panic.c:184
addrconf_notify+0x9fb/0x27f0 net/ipv6/addrconf.c:3435
notifier_call_chain+0x180/0x390 kernel/notifier.c:93
__raw_notifier_call_chain kernel/notifier.c:394 [inline]
raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401
call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1735
call_netdevice_notifiers net/core/dev.c:1753 [inline]
register_netdevice+0xb9d/0x1100 net/core/dev.c:8183
veth_newlink+0x5f5/0xa70 drivers/net/veth.c:443
rtnl_newlink+0xeff/0x1d60 net/core/rtnetlink.c:3050
__warn.cold.8+0x163/0x1ba kernel/panic.c:536
rtnetlink_rcv_msg+0x46e/0xc30 net/core/rtnetlink.c:4662
netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4680
report_bug+0x252/0x2d0 lib/bug.c:186
netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1336
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1901
sock_sendmsg_nosec net/socket.c:641 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:651
___sys_sendmsg+0x7fd/0x930 net/socket.c:2125
__sys_sendmsg+0x11d/0x290 net/socket.c:2163
__do_sys_sendmsg net/socket.c:2172 [inline]
__se_sys_sendmsg net/socket.c:2170 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2170
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
Freed by task 0:
RIP: 0010:stack_overflow_check arch/x86/kernel/irq_64.c:60 [inline]
RIP: 0010:handle_irq+0x1fb/0x2e7 arch/x86/kernel/irq_64.c:72
(stack is not available)
Code:
00
The buggy address belongs to the object at ffff8801d4832200
which belongs to the cache kmalloc-192 of size 192
00
The buggy address is located 32 bytes inside of
192-byte region [ffff8801d4832200, ffff8801d48322c0)
ff
The buggy address belongs to the page:
b6 80
page:ffffea0007520c80 count:1 mapcount:0 mapping:ffff8801da800040 index:0x0
00
00 00
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffffea00074f9d48 ffffea0007526848 ffff8801da800040
48
raw: 0000000000000000 ffff8801d4832000 0000000100000010 0000000000000000
c7 c7
page dumped because: kasan: bad access detected
40
bc
Memory state around the buggy address:
e4
ffff8801d4832100: f1 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2
87
ffff8801d4832180: f2 00 f2 f2 f2 f2 f2 f2 f2 f8 f2 f2 f2 f2 f2 f2
41
> ffff8801d4832200: f2 00 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00
54 41
^
55
ffff8801d4832280: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2
65
ffff8801d4832300: f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 f2
48
==================================================================
8b 04
kasan: CONFIG_KASAN_INLINE enabled
25 40 ee 01
kasan: GPF could be caused by NULL-ptr deref or user memory access
00 48 05 68 06
general protection fault: 0000 [#1] SMP KASAN
00 00
CPU: 1 PID: 2005 Comm: kworker/1:2 Tainted: G B 4.18.0-rc3+
#45
48 89
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
c6
e8 85
RIP: 0010:__x86_indirect_thunk_r14+0x10/0x20 arch/x86/lib/retpoline.S:46
b3 1c
Code: 90
00
0f
<0f>
ae e8
0b
eb f9
48 83
4c 89
c4 18
2c 24
e9 3f
c3 0f
ff
1f
ff ff
44
48
00
89 75
00 66
e0 e8
2e 0f
a1 69
1f 84
8f 00
00 00
48 8b
00 00
00 e8
RSP: 0018:ffff8801dae07f58 EFLAGS: 00010082
07 00
00 00
RAX: 0000000000000000 RBX: ffff8801ce1a4000 RCX: 0000000000000000
RDX: 0000000000010000 RSI: ffffffff81631851 RDI: 0000000000000001
f3 90
RBP: ffff8801dae07fb0 R08: ffff8801a9c52400 R09: ffffed003b5c3ec2
R10: ffffed003b5c3ec2 R11: ffff8801dae1f617 R12: fffffe0000011000
0f ae
R13: fffffe0000007080 R14: 0000000000000027 R15: 0000000000000000
e8 eb
f9 4c
89
34 24
do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245
<c3> 0f
common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642
1f
</IRQ>
44 00 00 66 2e 0f 1f 84 00 00 00 00 00 e8 07 00 00 00 f3
RSP: 0018:ffff8801cd80ecb8 EFLAGS: 00010293
RAX: ffff8801cd8065c0 RBX: ffff8801d4832200 RCX: ffffffff81601b77
RDX: 0000000000000000 RSI: ffffffff85fb9eaf RDI: ffff8801d6419b40
RBP: ffff8801cd80ef90 R08: fffffbfff1205391 R09: fffffbfff1205390
R10: fffffbfff1205390 R11: ffffffff89029c83 R12: ffffffff8984e080
R13: ffff8801d6419b40 R14: 1ffff1003a906446 R15: ffffffff8984de00
FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff2099bb70 CR3: 0000000008e6a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ip6_finish_output2+0xa5d/0x2820 net/ipv6/ip6_output.c:117
ip6_finish_output+0x5fe/0xbc0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:276 [inline]
ip6_output+0x234/0x9d0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:444 [inline]
NF_HOOK include/linux/netfilter.h:287 [inline]
ndisc_send_skb+0x100d/0x1570 net/ipv6/ndisc.c:491
ndisc_send_ns+0x3c1/0x8d0 net/ipv6/ndisc.c:633
addrconf_dad_work+0xbf2/0x1310 net/ipv6/addrconf.c:4061
process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
kthread+0x345/0x410 kernel/kthread.c:240
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
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syzbot.
syzbot can test patches for this bug, for details see:
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: KASAN: stack-out-of-bounds Read in __neigh_create
2018-07-05 4:59 KASAN: stack-out-of-bounds Read in __neigh_create syzbot
@ 2018-07-05 16:17 ` Dmitry Vyukov
0 siblings, 0 replies; 2+ messages in thread
From: Dmitry Vyukov @ 2018-07-05 16:17 UTC (permalink / raw)
To: syzbot
Cc: Alexey Dobriyan, David Miller, David Ahern, Eric Dumazet,
Florian Westphal, Kees Cook, LKML, netdev, Roopa Prabhu,
syzkaller-bugs, w.bumiller
On Thu, Jul 5, 2018 at 6:59 AM, syzbot
<syzbot+4dcaeea39647ed97d4c1@syzkaller.appspotmail.com> wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 2bdea157b999 Merge branch 'sctp-fully-support-for-dscp-and..
> git tree: bpf-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=11d40858400000
> kernel config: https://syzkaller.appspot.com/x/.config?x=f62553dc846b0692
> dashboard link: https://syzkaller.appspot.com/bug?extid=4dcaeea39647ed97d4c1
> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=174aae68400000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=120a0a1c400000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+4dcaeea39647ed97d4c1@syzkaller.appspotmail.com
#syz dup: KASAN: stack-out-of-bounds Read in timerqueue_add
> IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
> IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready
> 8021q: adding VLAN 0 to HW filter on device team0
> ==================================================================
> BUG: KASAN: stack-out-of-bounds in __neigh_create+0x1e93/0x2080
> net/core/neighbour.c:522
> Read of size 8 at addr ffff8801d4832220 by task kworker/1:2/2005
>
> CPU: 1 PID: 2005 Comm: kworker/1:2 Not tainted 4.18.0-rc3+ #45
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: ipv6_addrconf addrconf_dad_work
> Call Trace:
> ------------[ cut here ]------------
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
> do_IRQ(): syz-executor810 has overflown the kernel stack
> (cur:ffff8801d6450000,sp:ffff8801ce2cbd68,irq stk
> top-bottom:ffff8801dae00080-ffff8801dae08000,exception stk
> top-bottom:fffffe0000007080-fffffe0000011000,ip:lock_release+0x87/0xa30)
> WARNING: CPU: 0 PID: 4713 at arch/x86/kernel/irq_64.c:63
> stack_overflow_check arch/x86/kernel/irq_64.c:60 [inline]
> WARNING: CPU: 0 PID: 4713 at arch/x86/kernel/irq_64.c:63
> handle_irq+0x1fb/0x2e7 arch/x86/kernel/irq_64.c:72
> Kernel panic - not syncing: panic_on_warn set ...
>
> print_address_description+0x6c/0x20b mm/kasan/report.c:256
> kasan_report_error mm/kasan/report.c:354 [inline]
> kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
> __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
> __neigh_create+0x1e93/0x2080 net/core/neighbour.c:522
> ip6_finish_output2+0xa5d/0x2820 net/ipv6/ip6_output.c:117
> ip6_finish_output+0x5fe/0xbc0 net/ipv6/ip6_output.c:154
> NF_HOOK_COND include/linux/netfilter.h:276 [inline]
> ip6_output+0x234/0x9d0 net/ipv6/ip6_output.c:171
> dst_output include/net/dst.h:444 [inline]
> NF_HOOK include/linux/netfilter.h:287 [inline]
> ndisc_send_skb+0x100d/0x1570 net/ipv6/ndisc.c:491
> ndisc_send_ns+0x3c1/0x8d0 net/ipv6/ndisc.c:633
> addrconf_dad_work+0xbf2/0x1310 net/ipv6/addrconf.c:4061
> process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
> worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
> kthread+0x345/0x410 kernel/kthread.c:240
> ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
>
> CPU: 0 PID: 4713 Comm: syz-executor810 Not tainted 4.18.0-rc3+ #45
> Allocated by task 4511:
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> save_stack+0x43/0xd0 mm/kasan/kasan.c:448
> Call Trace:
> set_track mm/kasan/kasan.c:460 [inline]
> kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
> <IRQ>
> __do_kmalloc mm/slab.c:3718 [inline]
> __kmalloc_track_caller+0x14a/0x760 mm/slab.c:3733
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
> kmemdup+0x24/0x50 mm/util.c:118
> kmemdup include/linux/string.h:418 [inline]
> neigh_parms_alloc+0xea/0x6b0 net/core/neighbour.c:1492
> ipv6_add_dev+0x3ec/0x13b0 net/ipv6/addrconf.c:392
> panic+0x238/0x4e7 kernel/panic.c:184
> addrconf_notify+0x9fb/0x27f0 net/ipv6/addrconf.c:3435
> notifier_call_chain+0x180/0x390 kernel/notifier.c:93
> __raw_notifier_call_chain kernel/notifier.c:394 [inline]
> raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401
> call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1735
> call_netdevice_notifiers net/core/dev.c:1753 [inline]
> register_netdevice+0xb9d/0x1100 net/core/dev.c:8183
> veth_newlink+0x5f5/0xa70 drivers/net/veth.c:443
> rtnl_newlink+0xeff/0x1d60 net/core/rtnetlink.c:3050
> __warn.cold.8+0x163/0x1ba kernel/panic.c:536
> rtnetlink_rcv_msg+0x46e/0xc30 net/core/rtnetlink.c:4662
> netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448
> rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4680
> report_bug+0x252/0x2d0 lib/bug.c:186
> netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
> netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1336
> fixup_bug arch/x86/kernel/traps.c:178 [inline]
> do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
> netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1901
> sock_sendmsg_nosec net/socket.c:641 [inline]
> sock_sendmsg+0xd5/0x120 net/socket.c:651
> ___sys_sendmsg+0x7fd/0x930 net/socket.c:2125
> __sys_sendmsg+0x11d/0x290 net/socket.c:2163
> __do_sys_sendmsg net/socket.c:2172 [inline]
> __se_sys_sendmsg net/socket.c:2170 [inline]
> __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2170
> do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
>
> invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
> Freed by task 0:
> RIP: 0010:stack_overflow_check arch/x86/kernel/irq_64.c:60 [inline]
> RIP: 0010:handle_irq+0x1fb/0x2e7 arch/x86/kernel/irq_64.c:72
> (stack is not available)
> Code:
>
> 00
> The buggy address belongs to the object at ffff8801d4832200
> which belongs to the cache kmalloc-192 of size 192
> 00
> The buggy address is located 32 bytes inside of
> 192-byte region [ffff8801d4832200, ffff8801d48322c0)
> ff
> The buggy address belongs to the page:
> b6 80
> page:ffffea0007520c80 count:1 mapcount:0 mapping:ffff8801da800040 index:0x0
> 00
> 00 00
> flags: 0x2fffc0000000100(slab)
> raw: 02fffc0000000100 ffffea00074f9d48 ffffea0007526848 ffff8801da800040
> 48
> raw: 0000000000000000 ffff8801d4832000 0000000100000010 0000000000000000
> c7 c7
> page dumped because: kasan: bad access detected
> 40
>
> bc
> Memory state around the buggy address:
> e4
> ffff8801d4832100: f1 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2
> 87
> ffff8801d4832180: f2 00 f2 f2 f2 f2 f2 f2 f2 f8 f2 f2 f2 f2 f2 f2
> 41
>>
>> ffff8801d4832200: f2 00 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00
>
> 54 41
> ^
> 55
> ffff8801d4832280: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2
> 65
> ffff8801d4832300: f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 f2
> 48
> ==================================================================
> 8b 04
> kasan: CONFIG_KASAN_INLINE enabled
> 25 40 ee 01
> kasan: GPF could be caused by NULL-ptr deref or user memory access
> 00 48 05 68 06
> general protection fault: 0000 [#1] SMP KASAN
> 00 00
> CPU: 1 PID: 2005 Comm: kworker/1:2 Tainted: G B 4.18.0-rc3+
> #45
> 48 89
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: ipv6_addrconf addrconf_dad_work
> c6
> e8 85
> RIP: 0010:__x86_indirect_thunk_r14+0x10/0x20 arch/x86/lib/retpoline.S:46
> b3 1c
> Code: 90
> 00
> 0f
> <0f>
> ae e8
> 0b
> eb f9
> 48 83
> 4c 89
> c4 18
> 2c 24
> e9 3f
> c3 0f
> ff
> 1f
> ff ff
> 44
> 48
> 00
> 89 75
> 00 66
> e0 e8
> 2e 0f
> a1 69
> 1f 84
> 8f 00
> 00 00
> 48 8b
> 00 00
> 00 e8
> RSP: 0018:ffff8801dae07f58 EFLAGS: 00010082
> 07 00
> 00 00
> RAX: 0000000000000000 RBX: ffff8801ce1a4000 RCX: 0000000000000000
> RDX: 0000000000010000 RSI: ffffffff81631851 RDI: 0000000000000001
> f3 90
> RBP: ffff8801dae07fb0 R08: ffff8801a9c52400 R09: ffffed003b5c3ec2
> R10: ffffed003b5c3ec2 R11: ffff8801dae1f617 R12: fffffe0000011000
> 0f ae
> R13: fffffe0000007080 R14: 0000000000000027 R15: 0000000000000000
> e8 eb
> f9 4c
> 89
> 34 24
> do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245
> <c3> 0f
> common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642
> 1f
> </IRQ>
> 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 e8 07 00 00 00 f3
> RSP: 0018:ffff8801cd80ecb8 EFLAGS: 00010293
> RAX: ffff8801cd8065c0 RBX: ffff8801d4832200 RCX: ffffffff81601b77
> RDX: 0000000000000000 RSI: ffffffff85fb9eaf RDI: ffff8801d6419b40
> RBP: ffff8801cd80ef90 R08: fffffbfff1205391 R09: fffffbfff1205390
> R10: fffffbfff1205390 R11: ffffffff89029c83 R12: ffffffff8984e080
> R13: ffff8801d6419b40 R14: 1ffff1003a906446 R15: ffffffff8984de00
> FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fff2099bb70 CR3: 0000000008e6a000 CR4: 00000000001406e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> ip6_finish_output2+0xa5d/0x2820 net/ipv6/ip6_output.c:117
> ip6_finish_output+0x5fe/0xbc0 net/ipv6/ip6_output.c:154
> NF_HOOK_COND include/linux/netfilter.h:276 [inline]
> ip6_output+0x234/0x9d0 net/ipv6/ip6_output.c:171
> dst_output include/net/dst.h:444 [inline]
> NF_HOOK include/linux/netfilter.h:287 [inline]
> ndisc_send_skb+0x100d/0x1570 net/ipv6/ndisc.c:491
> ndisc_send_ns+0x3c1/0x8d0 net/ipv6/ndisc.c:633
> addrconf_dad_work+0xbf2/0x1310 net/ipv6/addrconf.c:4061
> process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
> worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
> kthread+0x345/0x410 kernel/kthread.c:240
> ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
> Modules linked in:
> Dumping ftrace buffer:
> (ftrace buffer empty)
> Dumping ftrace buffer:
> (ftrace buffer empty)
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
> syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
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2018-07-05 4:59 KASAN: stack-out-of-bounds Read in __neigh_create syzbot
2018-07-05 16:17 ` Dmitry Vyukov
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