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* 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..


---
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See https://goo.gl/tpsmEJ for more information about syzbot.
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https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with  
syzbot.
syzbot can test patches for this bug, for details see:
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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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