Hello,
syzkaller hit the following crash on
61233580f1f33c50e159c50e24d80ffd2ba2e06b
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: [email protected]
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
cookies. Check SNMP counters.
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline]
BUG: KASAN: slab-out-of-bounds in tcp_v6_syn_recv_sock+0x628/0x23a0
net/ipv6/tcp_ipv6.c:1144
Write of size 160 at addr ffff8801cbdd7460 by task syzkaller545407/3196
CPU: 1 PID: 3196 Comm: syzkaller545407 Not tainted 4.15.0-rc5+ #241
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
print_address_description+0x73/0x250 mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report+0x25b/0x340 mm/kasan/report.c:409
check_memory_region_inline mm/kasan/kasan.c:260 [inline]
check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
memcpy+0x37/0x50 mm/kasan/kasan.c:303
memcpy include/linux/string.h:344 [inline]
tcp_v6_syn_recv_sock+0x628/0x23a0 net/ipv6/tcp_ipv6.c:1144
tcp_get_cookie_sock+0x102/0x540 net/ipv4/syncookies.c:213
cookie_v6_check+0x177d/0x2160 net/ipv6/syncookies.c:255
tcp_v6_cookie_check net/ipv6/tcp_ipv6.c:1008 [inline]
tcp_v6_do_rcv+0xe4d/0x11c0 net/ipv6/tcp_ipv6.c:1316
tcp_v6_rcv+0x22ee/0x2b40 net/ipv6/tcp_ipv6.c:1510
ip6_input_finish+0x36f/0x1700 net/ipv6/ip6_input.c:284
NF_HOOK include/linux/netfilter.h:250 [inline]
ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327
dst_input include/net/dst.h:466 [inline]
ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71
NF_HOOK include/linux/netfilter.h:250 [inline]
ipv6_rcv+0xf1f/0x1f80 net/ipv6/ip6_input.c:208
__netif_receive_skb_core+0x1a3e/0x3450 net/core/dev.c:4461
__netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4526
process_backlog+0x203/0x740 net/core/dev.c:5205
napi_poll net/core/dev.c:5603 [inline]
net_rx_action+0x792/0x1910 net/core/dev.c:5669
__do_softirq+0x2d7/0xb85 kernel/softirq.c:285
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1115
</IRQ>
do_softirq.part.21+0x14d/0x190 kernel/softirq.c:329
do_softirq kernel/softirq.c:177 [inline]
__local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:182
local_bh_enable include/linux/bottom_half.h:32 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:727 [inline]
ip6_finish_output2+0xba6/0x2390 net/ipv6/ip6_output.c:121
ip6_finish_output+0x2f9/0x920 net/ipv6/ip6_output.c:146
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:163
dst_output include/net/dst.h:460 [inline]
NF_HOOK include/linux/netfilter.h:250 [inline]
ip6_xmit+0xd75/0x2080 net/ipv6/ip6_output.c:269
inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139
tcp_transmit_skb+0x1b12/0x38b0 net/ipv4/tcp_output.c:1176
tcp_write_xmit+0x680/0x5190 net/ipv4/tcp_output.c:2367
__tcp_push_pending_frames+0xa0/0x250 net/ipv4/tcp_output.c:2543
tcp_send_fin+0x1b0/0xd20 net/ipv4/tcp_output.c:3087
tcp_close+0xbe0/0xfc0 net/ipv4/tcp.c:2234
inet_release+0xed/0x1c0 net/ipv4/af_inet.c:426
inet6_release+0x50/0x70 net/ipv6/af_inet6.c:432
sock_release+0x8d/0x1e0 net/socket.c:600
sock_close+0x16/0x20 net/socket.c:1129
__fput+0x327/0x7e0 fs/file_table.c:210
____fput+0x15/0x20 fs/file_table.c:244
task_work_run+0x199/0x270 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x9bb/0x1ad0 kernel/exit.c:865
do_group_exit+0x149/0x400 kernel/exit.c:968
get_signal+0x73f/0x16c0 kernel/signal.c:2335
do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
entry_SYSCALL_64_fastpath+0x94/0x96
RIP: 0033:0x4456e9
RSP: 002b:00007fb4de631da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dac3c RCX: 00000000004456e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006dac3c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac38
R13: 0100000000000000 R14: 00007fb4de6329c0 R15: 0000000000000009
Allocated by task 3196:
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544
sk_prot_alloc+0x65/0x2a0 net/core/sock.c:1463
sk_clone_lock+0x152/0x1570 net/core/sock.c:1649
inet_csk_clone_lock+0x92/0x4f0 net/ipv4/inet_connection_sock.c:781
tcp_create_openreq_child+0x9b/0x1b70 net/ipv4/tcp_minisocks.c:449
tcp_v6_syn_recv_sock+0x22d/0x23a0 net/ipv6/tcp_ipv6.c:1123
tcp_get_cookie_sock+0x102/0x540 net/ipv4/syncookies.c:213
cookie_v6_check+0x177d/0x2160 net/ipv6/syncookies.c:255
tcp_v6_cookie_check net/ipv6/tcp_ipv6.c:1008 [inline]
tcp_v6_do_rcv+0xe4d/0x11c0 net/ipv6/tcp_ipv6.c:1316
tcp_v6_rcv+0x22ee/0x2b40 net/ipv6/tcp_ipv6.c:1510
ip6_input_finish+0x36f/0x1700 net/ipv6/ip6_input.c:284
NF_HOOK include/linux/netfilter.h:250 [inline]
ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327
dst_input include/net/dst.h:466 [inline]
ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71
NF_HOOK include/linux/netfilter.h:250 [inline]
ipv6_rcv+0xf1f/0x1f80 net/ipv6/ip6_input.c:208
__netif_receive_skb_core+0x1a3e/0x3450 net/core/dev.c:4461
__netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4526
process_backlog+0x203/0x740 net/core/dev.c:5205
napi_poll net/core/dev.c:5603 [inline]
net_rx_action+0x792/0x1910 net/core/dev.c:5669
__do_softirq+0x2d7/0xb85 kernel/softirq.c:285
Freed by task 0:
(stack is not available)
The buggy address belongs to the object at ffff8801cbdd6a80
which belongs to the cache TCP of size 2528
The buggy address is located 0 bytes to the right of
2528-byte region [ffff8801cbdd6a80, ffff8801cbdd7460)
The buggy address belongs to the page:
page:000000006145927c count:1 mapcount:0 mapping:00000000d41dd7c1
index:0xffff8801cbdd7ffd compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801cbdd6000 ffff8801cbdd7ffd 0000000100000003
raw: ffffea00074ef120 ffff8801d82b7248 ffff8801d798b640 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801cbdd7300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8801cbdd7380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffff8801cbdd7400: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
^
ffff8801cbdd7480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801cbdd7500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to [email protected].
syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
If you want to test a patch for this bug, please reply with:
#syz test: git://repo/address.git branch
and provide the patch inline or as an attachment.
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug
report.
Note: all commands must start from beginning of the line in the email body.
On Tue, Jan 2, 2018 at 3:58 PM, syzbot
<[email protected]> wrote:
> Hello,
>
> syzkaller hit the following crash on
> 61233580f1f33c50e159c50e24d80ffd2ba2e06b
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached
> Raw console output is attached.
> C reproducer is attached
> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> for information about syzkaller reproducers
>
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: [email protected]
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.
>
> TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
> cookies. Check SNMP counters.
> ==================================================================
> BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline]
> BUG: KASAN: slab-out-of-bounds in tcp_v6_syn_recv_sock+0x628/0x23a0
> net/ipv6/tcp_ipv6.c:1144
> Write of size 160 at addr ffff8801cbdd7460 by task syzkaller545407/3196
>
> CPU: 1 PID: 3196 Comm: syzkaller545407 Not tainted 4.15.0-rc5+ #241
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:17 [inline]
> dump_stack+0x194/0x257 lib/dump_stack.c:53
> print_address_description+0x73/0x250 mm/kasan/report.c:252
> kasan_report_error mm/kasan/report.c:351 [inline]
> kasan_report+0x25b/0x340 mm/kasan/report.c:409
> check_memory_region_inline mm/kasan/kasan.c:260 [inline]
> check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
> memcpy+0x37/0x50 mm/kasan/kasan.c:303
> memcpy include/linux/string.h:344 [inline]
> tcp_v6_syn_recv_sock+0x628/0x23a0 net/ipv6/tcp_ipv6.c:1144
tls_init() changes sk->sk_prot from IPv6 to IPv4, which leads
to this bug. I guess IPv6 is not supported for TLS? If so, need
a check on proto in tls_init()...
> tcp_get_cookie_sock+0x102/0x540 net/ipv4/syncookies.c:213
> cookie_v6_check+0x177d/0x2160 net/ipv6/syncookies.c:255
> tcp_v6_cookie_check net/ipv6/tcp_ipv6.c:1008 [inline]
> tcp_v6_do_rcv+0xe4d/0x11c0 net/ipv6/tcp_ipv6.c:1316
> tcp_v6_rcv+0x22ee/0x2b40 net/ipv6/tcp_ipv6.c:1510
> ip6_input_finish+0x36f/0x1700 net/ipv6/ip6_input.c:284
> NF_HOOK include/linux/netfilter.h:250 [inline]
> ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327
> dst_input include/net/dst.h:466 [inline]
> ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71
> NF_HOOK include/linux/netfilter.h:250 [inline]
> ipv6_rcv+0xf1f/0x1f80 net/ipv6/ip6_input.c:208
> __netif_receive_skb_core+0x1a3e/0x3450 net/core/dev.c:4461
> __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4526
> process_backlog+0x203/0x740 net/core/dev.c:5205
> napi_poll net/core/dev.c:5603 [inline]
> net_rx_action+0x792/0x1910 net/core/dev.c:5669
> __do_softirq+0x2d7/0xb85 kernel/softirq.c:285
> do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1115
> </IRQ>
> do_softirq.part.21+0x14d/0x190 kernel/softirq.c:329
> do_softirq kernel/softirq.c:177 [inline]
> __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:182
> local_bh_enable include/linux/bottom_half.h:32 [inline]
> rcu_read_unlock_bh include/linux/rcupdate.h:727 [inline]
> ip6_finish_output2+0xba6/0x2390 net/ipv6/ip6_output.c:121
> ip6_finish_output+0x2f9/0x920 net/ipv6/ip6_output.c:146
> NF_HOOK_COND include/linux/netfilter.h:239 [inline]
> ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:163
> dst_output include/net/dst.h:460 [inline]
> NF_HOOK include/linux/netfilter.h:250 [inline]
> ip6_xmit+0xd75/0x2080 net/ipv6/ip6_output.c:269
> inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139
> tcp_transmit_skb+0x1b12/0x38b0 net/ipv4/tcp_output.c:1176
> tcp_write_xmit+0x680/0x5190 net/ipv4/tcp_output.c:2367
> __tcp_push_pending_frames+0xa0/0x250 net/ipv4/tcp_output.c:2543
> tcp_send_fin+0x1b0/0xd20 net/ipv4/tcp_output.c:3087
> tcp_close+0xbe0/0xfc0 net/ipv4/tcp.c:2234
> inet_release+0xed/0x1c0 net/ipv4/af_inet.c:426
> inet6_release+0x50/0x70 net/ipv6/af_inet6.c:432
> sock_release+0x8d/0x1e0 net/socket.c:600
> sock_close+0x16/0x20 net/socket.c:1129
> __fput+0x327/0x7e0 fs/file_table.c:210
> ____fput+0x15/0x20 fs/file_table.c:244
> task_work_run+0x199/0x270 kernel/task_work.c:113
> exit_task_work include/linux/task_work.h:22 [inline]
> do_exit+0x9bb/0x1ad0 kernel/exit.c:865
> do_group_exit+0x149/0x400 kernel/exit.c:968
> get_signal+0x73f/0x16c0 kernel/signal.c:2335
> do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:809
> exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
> prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
> syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
> entry_SYSCALL_64_fastpath+0x94/0x96
> RIP: 0033:0x4456e9
> RSP: 002b:00007fb4de631da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
> RAX: fffffffffffffe00 RBX: 00000000006dac3c RCX: 00000000004456e9
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006dac3c
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac38
> R13: 0100000000000000 R14: 00007fb4de6329c0 R15: 0000000000000009
>
> Allocated by task 3196:
> save_stack+0x43/0xd0 mm/kasan/kasan.c:447
> set_track mm/kasan/kasan.c:459 [inline]
> kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
> kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
> kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544
> sk_prot_alloc+0x65/0x2a0 net/core/sock.c:1463
> sk_clone_lock+0x152/0x1570 net/core/sock.c:1649
> inet_csk_clone_lock+0x92/0x4f0 net/ipv4/inet_connection_sock.c:781
> tcp_create_openreq_child+0x9b/0x1b70 net/ipv4/tcp_minisocks.c:449
> tcp_v6_syn_recv_sock+0x22d/0x23a0 net/ipv6/tcp_ipv6.c:1123
> tcp_get_cookie_sock+0x102/0x540 net/ipv4/syncookies.c:213
> cookie_v6_check+0x177d/0x2160 net/ipv6/syncookies.c:255
> tcp_v6_cookie_check net/ipv6/tcp_ipv6.c:1008 [inline]
> tcp_v6_do_rcv+0xe4d/0x11c0 net/ipv6/tcp_ipv6.c:1316
> tcp_v6_rcv+0x22ee/0x2b40 net/ipv6/tcp_ipv6.c:1510
> ip6_input_finish+0x36f/0x1700 net/ipv6/ip6_input.c:284
> NF_HOOK include/linux/netfilter.h:250 [inline]
> ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327
> dst_input include/net/dst.h:466 [inline]
> ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71
> NF_HOOK include/linux/netfilter.h:250 [inline]
> ipv6_rcv+0xf1f/0x1f80 net/ipv6/ip6_input.c:208
> __netif_receive_skb_core+0x1a3e/0x3450 net/core/dev.c:4461
> __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4526
> process_backlog+0x203/0x740 net/core/dev.c:5205
> napi_poll net/core/dev.c:5603 [inline]
> net_rx_action+0x792/0x1910 net/core/dev.c:5669
> __do_softirq+0x2d7/0xb85 kernel/softirq.c:285
>
> Freed by task 0:
> (stack is not available)
>
> The buggy address belongs to the object at ffff8801cbdd6a80
> which belongs to the cache TCP of size 2528
> The buggy address is located 0 bytes to the right of
> 2528-byte region [ffff8801cbdd6a80, ffff8801cbdd7460)
> The buggy address belongs to the page:
> page:000000006145927c count:1 mapcount:0 mapping:00000000d41dd7c1
> index:0xffff8801cbdd7ffd compound_mapcount: 0
> flags: 0x2fffc0000008100(slab|head)
> raw: 02fffc0000008100 ffff8801cbdd6000 ffff8801cbdd7ffd 0000000100000003
> raw: ffffea00074ef120 ffff8801d82b7248 ffff8801d798b640 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
> ffff8801cbdd7300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffff8801cbdd7380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>
>> ffff8801cbdd7400: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
>
> ^
> ffff8801cbdd7480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8801cbdd7500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ==================================================================
>
>
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to [email protected].
>
> syzbot will keep track of this bug report.
> If you forgot to add the Reported-by tag, once the fix for this bug is
> merged
> into any tree, please reply to this email with:
> #syz fix: exact-commit-title
> If you want to test a patch for this bug, please reply with:
> #syz test: git://repo/address.git branch
> and provide the patch inline or as an attachment.
> To mark this as a duplicate of another syzbot report, please reply with:
> #syz dup: exact-subject-of-another-report
> If it's a one-off invalid bug report, please reply with:
> #syz invalid
> Note: if the crash happens again, it will cause creation of a new bug
> report.
> Note: all commands must start from beginning of the line in the email body.
03.01.2018, 21:57, "Cong Wang" <[email protected]>:
> On Tue, Jan 2, 2018 at 3:58 PM, syzbot
> <[email protected]> wrote:
>> Hello,
>>
>> syzkaller hit the following crash on
>> 61233580f1f33c50e159c50e24d80ffd2ba2e06b
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
>> compiler: gcc (GCC) 7.1.1 20170620
>> .config is attached
>> Raw console output is attached.
>> C reproducer is attached
>> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
>> for information about syzkaller reproducers
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: [email protected]
>> It will help syzbot understand when the bug is fixed. See footer for
>> details.
>> If you forward the report, please keep this part and the footer.
>>
>> TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
>> cookies. Check SNMP counters.
>> ==================================================================
>> BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline]
>> BUG: KASAN: slab-out-of-bounds in tcp_v6_syn_recv_sock+0x628/0x23a0
>> net/ipv6/tcp_ipv6.c:1144
>> Write of size 160 at addr ffff8801cbdd7460 by task syzkaller545407/3196
>>
>> CPU: 1 PID: 3196 Comm: syzkaller545407 Not tainted 4.15.0-rc5+ #241
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> Google 01/01/2011
>> Call Trace:
>> <IRQ>
>> __dump_stack lib/dump_stack.c:17 [inline]
>> dump_stack+0x194/0x257 lib/dump_stack.c:53
>> print_address_description+0x73/0x250 mm/kasan/report.c:252
>> kasan_report_error mm/kasan/report.c:351 [inline]
>> kasan_report+0x25b/0x340 mm/kasan/report.c:409
>> check_memory_region_inline mm/kasan/kasan.c:260 [inline]
>> check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
>> memcpy+0x37/0x50 mm/kasan/kasan.c:303
>> memcpy include/linux/string.h:344 [inline]
>> tcp_v6_syn_recv_sock+0x628/0x23a0 net/ipv6/tcp_ipv6.c:1144
>
> tls_init() changes sk->sk_prot from IPv6 to IPv4, which leads
> to this bug. I guess IPv6 is not supported for TLS? If so, need
> a check on proto in tls_init()...
Hello,
I think IPv6 supports with TLS.
There was a previously posted commit by Mellanox:
https://patchwork.ozlabs.org/patch/801530/
Ozgur
>> tcp_get_cookie_sock+0x102/0x540 net/ipv4/syncookies.c:213
>> cookie_v6_check+0x177d/0x2160 net/ipv6/syncookies.c:255
>> tcp_v6_cookie_check net/ipv6/tcp_ipv6.c:1008 [inline]
>> tcp_v6_do_rcv+0xe4d/0x11c0 net/ipv6/tcp_ipv6.c:1316
>> tcp_v6_rcv+0x22ee/0x2b40 net/ipv6/tcp_ipv6.c:1510
>> ip6_input_finish+0x36f/0x1700 net/ipv6/ip6_input.c:284
>> NF_HOOK include/linux/netfilter.h:250 [inline]
>> ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327
>> dst_input include/net/dst.h:466 [inline]
>> ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71
>> NF_HOOK include/linux/netfilter.h:250 [inline]
>> ipv6_rcv+0xf1f/0x1f80 net/ipv6/ip6_input.c:208
>> __netif_receive_skb_core+0x1a3e/0x3450 net/core/dev.c:4461
>> __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4526
>> process_backlog+0x203/0x740 net/core/dev.c:5205
>> napi_poll net/core/dev.c:5603 [inline]
>> net_rx_action+0x792/0x1910 net/core/dev.c:5669
>> __do_softirq+0x2d7/0xb85 kernel/softirq.c:285
>> do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1115
>> </IRQ>
>> do_softirq.part.21+0x14d/0x190 kernel/softirq.c:329
>> do_softirq kernel/softirq.c:177 [inline]
>> __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:182
>> local_bh_enable include/linux/bottom_half.h:32 [inline]
>> rcu_read_unlock_bh include/linux/rcupdate.h:727 [inline]
>> ip6_finish_output2+0xba6/0x2390 net/ipv6/ip6_output.c:121
>> ip6_finish_output+0x2f9/0x920 net/ipv6/ip6_output.c:146
>> NF_HOOK_COND include/linux/netfilter.h:239 [inline]
>> ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:163
>> dst_output include/net/dst.h:460 [inline]
>> NF_HOOK include/linux/netfilter.h:250 [inline]
>> ip6_xmit+0xd75/0x2080 net/ipv6/ip6_output.c:269
>> inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139
>> tcp_transmit_skb+0x1b12/0x38b0 net/ipv4/tcp_output.c:1176
>> tcp_write_xmit+0x680/0x5190 net/ipv4/tcp_output.c:2367
>> __tcp_push_pending_frames+0xa0/0x250 net/ipv4/tcp_output.c:2543
>> tcp_send_fin+0x1b0/0xd20 net/ipv4/tcp_output.c:3087
>> tcp_close+0xbe0/0xfc0 net/ipv4/tcp.c:2234
>> inet_release+0xed/0x1c0 net/ipv4/af_inet.c:426
>> inet6_release+0x50/0x70 net/ipv6/af_inet6.c:432
>> sock_release+0x8d/0x1e0 net/socket.c:600
>> sock_close+0x16/0x20 net/socket.c:1129
>> __fput+0x327/0x7e0 fs/file_table.c:210
>> ____fput+0x15/0x20 fs/file_table.c:244
>> task_work_run+0x199/0x270 kernel/task_work.c:113
>> exit_task_work include/linux/task_work.h:22 [inline]
>> do_exit+0x9bb/0x1ad0 kernel/exit.c:865
>> do_group_exit+0x149/0x400 kernel/exit.c:968
>> get_signal+0x73f/0x16c0 kernel/signal.c:2335
>> do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:809
>> exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
>> prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
>> syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
>> entry_SYSCALL_64_fastpath+0x94/0x96
>> RIP: 0033:0x4456e9
>> RSP: 002b:00007fb4de631da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
>> RAX: fffffffffffffe00 RBX: 00000000006dac3c RCX: 00000000004456e9
>> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006dac3c
>> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac38
>> R13: 0100000000000000 R14: 00007fb4de6329c0 R15: 0000000000000009
>>
>> Allocated by task 3196:
>> save_stack+0x43/0xd0 mm/kasan/kasan.c:447
>> set_track mm/kasan/kasan.c:459 [inline]
>> kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
>> kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
>> kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544
>> sk_prot_alloc+0x65/0x2a0 net/core/sock.c:1463
>> sk_clone_lock+0x152/0x1570 net/core/sock.c:1649
>> inet_csk_clone_lock+0x92/0x4f0 net/ipv4/inet_connection_sock.c:781
>> tcp_create_openreq_child+0x9b/0x1b70 net/ipv4/tcp_minisocks.c:449
>> tcp_v6_syn_recv_sock+0x22d/0x23a0 net/ipv6/tcp_ipv6.c:1123
>> tcp_get_cookie_sock+0x102/0x540 net/ipv4/syncookies.c:213
>> cookie_v6_check+0x177d/0x2160 net/ipv6/syncookies.c:255
>> tcp_v6_cookie_check net/ipv6/tcp_ipv6.c:1008 [inline]
>> tcp_v6_do_rcv+0xe4d/0x11c0 net/ipv6/tcp_ipv6.c:1316
>> tcp_v6_rcv+0x22ee/0x2b40 net/ipv6/tcp_ipv6.c:1510
>> ip6_input_finish+0x36f/0x1700 net/ipv6/ip6_input.c:284
>> NF_HOOK include/linux/netfilter.h:250 [inline]
>> ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327
>> dst_input include/net/dst.h:466 [inline]
>> ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71
>> NF_HOOK include/linux/netfilter.h:250 [inline]
>> ipv6_rcv+0xf1f/0x1f80 net/ipv6/ip6_input.c:208
>> __netif_receive_skb_core+0x1a3e/0x3450 net/core/dev.c:4461
>> __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4526
>> process_backlog+0x203/0x740 net/core/dev.c:5205
>> napi_poll net/core/dev.c:5603 [inline]
>> net_rx_action+0x792/0x1910 net/core/dev.c:5669
>> __do_softirq+0x2d7/0xb85 kernel/softirq.c:285
>>
>> Freed by task 0:
>> (stack is not available)
>>
>> The buggy address belongs to the object at ffff8801cbdd6a80
>> which belongs to the cache TCP of size 2528
>> The buggy address is located 0 bytes to the right of
>> 2528-byte region [ffff8801cbdd6a80, ffff8801cbdd7460)
>> The buggy address belongs to the page:
>> page:000000006145927c count:1 mapcount:0 mapping:00000000d41dd7c1
>> index:0xffff8801cbdd7ffd compound_mapcount: 0
>> flags: 0x2fffc0000008100(slab|head)
>> raw: 02fffc0000008100 ffff8801cbdd6000 ffff8801cbdd7ffd 0000000100000003
>> raw: ffffea00074ef120 ffff8801d82b7248 ffff8801d798b640 0000000000000000
>> page dumped because: kasan: bad access detected
>>
>> Memory state around the buggy address:
>> ffff8801cbdd7300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> ffff8801cbdd7380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> ffff8801cbdd7400: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
>>
>> ^
>> ffff8801cbdd7480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>> ffff8801cbdd7500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> ==================================================================
>>
>> ---
>> This bug is generated by a dumb bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for details.
>> Direct all questions to [email protected].
>>
>> syzbot will keep track of this bug report.
>> If you forgot to add the Reported-by tag, once the fix for this bug is
>> merged
>> into any tree, please reply to this email with:
>> #syz fix: exact-commit-title
>> If you want to test a patch for this bug, please reply with:
>> #syz test: git://repo/address.git branch
>> and provide the patch inline or as an attachment.
>> To mark this as a duplicate of another syzbot report, please reply with:
>> #syz dup: exact-subject-of-another-report
>> If it's a one-off invalid bug report, please reply with:
>> #syz invalid
>> Note: if the crash happens again, it will cause creation of a new bug
>> report.
>> Note: all commands must start from beginning of the line in the email body.
On Wed, Jan 3, 2018 at 12:55 PM, Ozgur <[email protected]> wrote:
>
>
> 03.01.2018, 21:57, "Cong Wang" <[email protected]>:
>> On Tue, Jan 2, 2018 at 3:58 PM, syzbot
>> <[email protected]> wrote:
>>> Hello,
>>>
>>> syzkaller hit the following crash on
>>> 61233580f1f33c50e159c50e24d80ffd2ba2e06b
>>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
>>> compiler: gcc (GCC) 7.1.1 20170620
>>> .config is attached
>>> Raw console output is attached.
>>> C reproducer is attached
>>> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
>>> for information about syzkaller reproducers
>>>
>>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>>> Reported-by: [email protected]
>>> It will help syzbot understand when the bug is fixed. See footer for
>>> details.
>>> If you forward the report, please keep this part and the footer.
>>>
>>> TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
>>> cookies. Check SNMP counters.
>>> ==================================================================
>>> BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline]
>>> BUG: KASAN: slab-out-of-bounds in tcp_v6_syn_recv_sock+0x628/0x23a0
>>> net/ipv6/tcp_ipv6.c:1144
>>> Write of size 160 at addr ffff8801cbdd7460 by task syzkaller545407/3196
>>>
>>> CPU: 1 PID: 3196 Comm: syzkaller545407 Not tainted 4.15.0-rc5+ #241
>>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>>> Google 01/01/2011
>>> Call Trace:
>>> <IRQ>
>>> __dump_stack lib/dump_stack.c:17 [inline]
>>> dump_stack+0x194/0x257 lib/dump_stack.c:53
>>> print_address_description+0x73/0x250 mm/kasan/report.c:252
>>> kasan_report_error mm/kasan/report.c:351 [inline]
>>> kasan_report+0x25b/0x340 mm/kasan/report.c:409
>>> check_memory_region_inline mm/kasan/kasan.c:260 [inline]
>>> check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
>>> memcpy+0x37/0x50 mm/kasan/kasan.c:303
>>> memcpy include/linux/string.h:344 [inline]
>>> tcp_v6_syn_recv_sock+0x628/0x23a0 net/ipv6/tcp_ipv6.c:1144
>>
>> tls_init() changes sk->sk_prot from IPv6 to IPv4, which leads
>> to this bug. I guess IPv6 is not supported for TLS? If so, need
>> a check on proto in tls_init()...
>
> Hello,
>
> I think IPv6 supports with TLS.
> There was a previously posted commit by Mellanox:
>
> https://patchwork.ozlabs.org/patch/801530/
Good to know.
Can you resend the fix? It could probably fix another warning
reported by syzbot too.
On Thu, Jan 4, 2018 at 12:31 AM, Cong Wang <[email protected]> wrote:
> On Wed, Jan 3, 2018 at 12:55 PM, Ozgur <[email protected]> wrote:
>>
>>
>> 03.01.2018, 21:57, "Cong Wang" <[email protected]>:
>>> On Tue, Jan 2, 2018 at 3:58 PM, syzbot
>>> <[email protected]> wrote:
>>>> Hello,
>>>>
>>>> syzkaller hit the following crash on
>>>> 61233580f1f33c50e159c50e24d80ffd2ba2e06b
>>>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
>>>> compiler: gcc (GCC) 7.1.1 20170620
>>>> .config is attached
>>>> Raw console output is attached.
>>>> C reproducer is attached
>>>> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
>>>> for information about syzkaller reproducers
>>>>
>>>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>>>> Reported-by: [email protected]
>>>> It will help syzbot understand when the bug is fixed. See footer for
>>>> details.
>>>> If you forward the report, please keep this part and the footer.
>>>>
>>>> TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
>>>> cookies. Check SNMP counters.
>>>> ==================================================================
>>>> BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline]
>>>> BUG: KASAN: slab-out-of-bounds in tcp_v6_syn_recv_sock+0x628/0x23a0
>>>> net/ipv6/tcp_ipv6.c:1144
>>>> Write of size 160 at addr ffff8801cbdd7460 by task syzkaller545407/3196
>>>>
>>>> CPU: 1 PID: 3196 Comm: syzkaller545407 Not tainted 4.15.0-rc5+ #241
>>>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>>>> Google 01/01/2011
>>>> Call Trace:
>>>> <IRQ>
>>>> __dump_stack lib/dump_stack.c:17 [inline]
>>>> dump_stack+0x194/0x257 lib/dump_stack.c:53
>>>> print_address_description+0x73/0x250 mm/kasan/report.c:252
>>>> kasan_report_error mm/kasan/report.c:351 [inline]
>>>> kasan_report+0x25b/0x340 mm/kasan/report.c:409
>>>> check_memory_region_inline mm/kasan/kasan.c:260 [inline]
>>>> check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
>>>> memcpy+0x37/0x50 mm/kasan/kasan.c:303
>>>> memcpy include/linux/string.h:344 [inline]
>>>> tcp_v6_syn_recv_sock+0x628/0x23a0 net/ipv6/tcp_ipv6.c:1144
>>>
>>> tls_init() changes sk->sk_prot from IPv6 to IPv4, which leads
>>> to this bug. I guess IPv6 is not supported for TLS? If so, need
>>> a check on proto in tls_init()...
>>
>> Hello,
>>
>> I think IPv6 supports with TLS.
>> There was a previously posted commit by Mellanox:
>>
>> https://patchwork.ozlabs.org/patch/801530/
>
> Good to know.
>
> Can you resend the fix? It could probably fix another warning
> reported by syzbot too.
FTR this has been assigned CVE-2018-5703
On Wed, Jan 3, 2018 at 3:31 PM, Cong Wang <[email protected]> wrote:
>
> On Wed, Jan 3, 2018 at 12:55 PM, Ozgur <[email protected]> wrote:
> >
> >
> > 03.01.2018, 21:57, "Cong Wang" <[email protected]>:
> >> On Tue, Jan 2, 2018 at 3:58 PM, syzbot
> >> <[email protected]> wrote:
> >>> Hello,
> >>>
> >>> syzkaller hit the following crash on
> >>> 61233580f1f33c50e159c50e24d80ffd2ba2e06b
> >>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> >>> compiler: gcc (GCC) 7.1.1 20170620
> >>> .config is attached
> >>> Raw console output is attached.
> >>> C reproducer is attached
> >>> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> >>> for information about syzkaller reproducers
> >>>
> >>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> >>> Reported-by: [email protected]
> >>> It will help syzbot understand when the bug is fixed. See footer for
> >>> details.
> >>> If you forward the report, please keep this part and the footer.
> >>>
> >>> TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
> >>> cookies. Check SNMP counters.
> >>> ==================================================================
> >>> BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline]
> >>> BUG: KASAN: slab-out-of-bounds in tcp_v6_syn_recv_sock+0x628/0x23a0
> >>> net/ipv6/tcp_ipv6.c:1144
> >>> Write of size 160 at addr ffff8801cbdd7460 by task syzkaller545407/3196
> >>>
> >>> CPU: 1 PID: 3196 Comm: syzkaller545407 Not tainted 4.15.0-rc5+ #241
> >>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> >>> Google 01/01/2011
> >>> Call Trace:
> >>> <IRQ>
> >>> __dump_stack lib/dump_stack.c:17 [inline]
> >>> dump_stack+0x194/0x257 lib/dump_stack.c:53
> >>> print_address_description+0x73/0x250 mm/kasan/report.c:252
> >>> kasan_report_error mm/kasan/report.c:351 [inline]
> >>> kasan_report+0x25b/0x340 mm/kasan/report.c:409
> >>> check_memory_region_inline mm/kasan/kasan.c:260 [inline]
> >>> check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
> >>> memcpy+0x37/0x50 mm/kasan/kasan.c:303
> >>> memcpy include/linux/string.h:344 [inline]
> >>> tcp_v6_syn_recv_sock+0x628/0x23a0 net/ipv6/tcp_ipv6.c:1144
> >>
> >> tls_init() changes sk->sk_prot from IPv6 to IPv4, which leads
> >> to this bug. I guess IPv6 is not supported for TLS? If so, need
> >> a check on proto in tls_init()...
> >
> > Hello,
> >
> > I think IPv6 supports with TLS.
> > There was a previously posted commit by Mellanox:
> >
> > https://patchwork.ozlabs.org/patch/801530/
>
> Good to know.
>
> Can you resend the fix? It could probably fix another warning
> reported by syzbot too.
What is the status on resending the patch?
(https://patchwork.ozlabs.org/patch/801530/)
Another slab-out-of-bound report that could be fixed by it:
syzbot has found reproducer for the following crash on
6bd39bc3da0f4a301fae69c4a32db2768f5118be
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
compiler: gcc (GCC) 7.1.1 20170620
==================================================================
BUG: KASAN: slab-out-of-bounds in ip6_dst_idev
include/net/ip6_fib.h:192 [inline]
BUG: KASAN: slab-out-of-bounds in ip6_xmit+0x1ce9/0x2090
net/ipv6/ip6_output.c:264
Read of size 8 at addr ffff8801d99a1018 by task syzkaller716686/3664
CPU: 0 PID: 3664 Comm: syzkaller716686 Not tainted 4.15.0-rc7+ #187
Hardware name: Google Google Compute Engine/Google Compute Engine,
BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
print_address_description+0x73/0x250 mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report+0x25b/0x340 mm/kasan/report.c:409
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
ip6_dst_idev include/net/ip6_fib.h:192 [inline]
ip6_xmit+0x1ce9/0x2090 net/ipv6/ip6_output.c:264
inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139
tcp_transmit_skb+0x1b1b/0x38c0 net/ipv4/tcp_output.c:1176
tcp_send_syn_data net/ipv4/tcp_output.c:3457 [inline]
tcp_connect+0x1edb/0x4090 net/ipv4/tcp_output.c:3496
tcp_v4_connect+0x15ef/0x1e70 net/ipv4/tcp_ipv4.c:257
__inet_stream_connect+0x2d4/0xf00 net/ipv4/af_inet.c:620
tcp_sendmsg_fastopen net/ipv4/tcp.c:1168 [inline]
tcp_sendmsg_locked+0x264e/0x3c70 net/ipv4/tcp.c:1214
tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1463
inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
sock_sendmsg_nosec net/socket.c:630 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:640
___sys_sendmsg+0x320/0x8b0 net/socket.c:2020
__sys_sendmmsg+0x1ee/0x620 net/socket.c:2110
SYSC_sendmmsg net/socket.c:2141 [inline]
SyS_sendmmsg+0x35/0x60 net/socket.c:2136
entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x43fdd9
RSP: 002b:00007ffcaf235288 EFLAGS: 00000217 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdd9
RDX: 0000000000000001 RSI: 00000000205f8fc8 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000217 R12: 0000000000401740
R13: 00000000004017d0 R14: 0000000000000000 R15: 0000000000000000
On Tue, Jan 02, 2018 at 03:58:01PM -0800, syzbot wrote:
> Hello,
>
> syzkaller hit the following crash on
> 61233580f1f33c50e159c50e24d80ffd2ba2e06b
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached
> Raw console output is attached.
> C reproducer is attached
> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> for information about syzkaller reproducers
>
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: [email protected]
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.
>
> TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending
> cookies. Check SNMP counters.
> ==================================================================
> BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:344 [inline]
> BUG: KASAN: slab-out-of-bounds in tcp_v6_syn_recv_sock+0x628/0x23a0
> net/ipv6/tcp_ipv6.c:1144
> Write of size 160 at addr ffff8801cbdd7460 by task syzkaller545407/3196
>
> CPU: 1 PID: 3196 Comm: syzkaller545407 Not tainted 4.15.0-rc5+ #241
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:17 [inline]
> dump_stack+0x194/0x257 lib/dump_stack.c:53
> print_address_description+0x73/0x250 mm/kasan/report.c:252
> kasan_report_error mm/kasan/report.c:351 [inline]
> kasan_report+0x25b/0x340 mm/kasan/report.c:409
> check_memory_region_inline mm/kasan/kasan.c:260 [inline]
> check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
> memcpy+0x37/0x50 mm/kasan/kasan.c:303
> memcpy include/linux/string.h:344 [inline]
> tcp_v6_syn_recv_sock+0x628/0x23a0 net/ipv6/tcp_ipv6.c:1144
> tcp_get_cookie_sock+0x102/0x540 net/ipv4/syncookies.c:213
> cookie_v6_check+0x177d/0x2160 net/ipv6/syncookies.c:255
> tcp_v6_cookie_check net/ipv6/tcp_ipv6.c:1008 [inline]
> tcp_v6_do_rcv+0xe4d/0x11c0 net/ipv6/tcp_ipv6.c:1316
> tcp_v6_rcv+0x22ee/0x2b40 net/ipv6/tcp_ipv6.c:1510
> ip6_input_finish+0x36f/0x1700 net/ipv6/ip6_input.c:284
> NF_HOOK include/linux/netfilter.h:250 [inline]
> ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327
> dst_input include/net/dst.h:466 [inline]
> ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71
> NF_HOOK include/linux/netfilter.h:250 [inline]
> ipv6_rcv+0xf1f/0x1f80 net/ipv6/ip6_input.c:208
> __netif_receive_skb_core+0x1a3e/0x3450 net/core/dev.c:4461
> __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4526
> process_backlog+0x203/0x740 net/core/dev.c:5205
> napi_poll net/core/dev.c:5603 [inline]
> net_rx_action+0x792/0x1910 net/core/dev.c:5669
> __do_softirq+0x2d7/0xb85 kernel/softirq.c:285
> do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1115
> </IRQ>
> do_softirq.part.21+0x14d/0x190 kernel/softirq.c:329
> do_softirq kernel/softirq.c:177 [inline]
> __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:182
> local_bh_enable include/linux/bottom_half.h:32 [inline]
> rcu_read_unlock_bh include/linux/rcupdate.h:727 [inline]
> ip6_finish_output2+0xba6/0x2390 net/ipv6/ip6_output.c:121
> ip6_finish_output+0x2f9/0x920 net/ipv6/ip6_output.c:146
> NF_HOOK_COND include/linux/netfilter.h:239 [inline]
> ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:163
> dst_output include/net/dst.h:460 [inline]
> NF_HOOK include/linux/netfilter.h:250 [inline]
> ip6_xmit+0xd75/0x2080 net/ipv6/ip6_output.c:269
> inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139
> tcp_transmit_skb+0x1b12/0x38b0 net/ipv4/tcp_output.c:1176
> tcp_write_xmit+0x680/0x5190 net/ipv4/tcp_output.c:2367
> __tcp_push_pending_frames+0xa0/0x250 net/ipv4/tcp_output.c:2543
> tcp_send_fin+0x1b0/0xd20 net/ipv4/tcp_output.c:3087
> tcp_close+0xbe0/0xfc0 net/ipv4/tcp.c:2234
> inet_release+0xed/0x1c0 net/ipv4/af_inet.c:426
> inet6_release+0x50/0x70 net/ipv6/af_inet6.c:432
> sock_release+0x8d/0x1e0 net/socket.c:600
> sock_close+0x16/0x20 net/socket.c:1129
> __fput+0x327/0x7e0 fs/file_table.c:210
> ____fput+0x15/0x20 fs/file_table.c:244
> task_work_run+0x199/0x270 kernel/task_work.c:113
> exit_task_work include/linux/task_work.h:22 [inline]
> do_exit+0x9bb/0x1ad0 kernel/exit.c:865
> do_group_exit+0x149/0x400 kernel/exit.c:968
> get_signal+0x73f/0x16c0 kernel/signal.c:2335
> do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:809
> exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
> prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
> syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
> entry_SYSCALL_64_fastpath+0x94/0x96
> RIP: 0033:0x4456e9
> RSP: 002b:00007fb4de631da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
> RAX: fffffffffffffe00 RBX: 00000000006dac3c RCX: 00000000004456e9
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006dac3c
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac38
> R13: 0100000000000000 R14: 00007fb4de6329c0 R15: 0000000000000009
>
> Allocated by task 3196:
> save_stack+0x43/0xd0 mm/kasan/kasan.c:447
> set_track mm/kasan/kasan.c:459 [inline]
> kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
> kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
> kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544
> sk_prot_alloc+0x65/0x2a0 net/core/sock.c:1463
> sk_clone_lock+0x152/0x1570 net/core/sock.c:1649
> inet_csk_clone_lock+0x92/0x4f0 net/ipv4/inet_connection_sock.c:781
> tcp_create_openreq_child+0x9b/0x1b70 net/ipv4/tcp_minisocks.c:449
> tcp_v6_syn_recv_sock+0x22d/0x23a0 net/ipv6/tcp_ipv6.c:1123
> tcp_get_cookie_sock+0x102/0x540 net/ipv4/syncookies.c:213
> cookie_v6_check+0x177d/0x2160 net/ipv6/syncookies.c:255
> tcp_v6_cookie_check net/ipv6/tcp_ipv6.c:1008 [inline]
> tcp_v6_do_rcv+0xe4d/0x11c0 net/ipv6/tcp_ipv6.c:1316
> tcp_v6_rcv+0x22ee/0x2b40 net/ipv6/tcp_ipv6.c:1510
> ip6_input_finish+0x36f/0x1700 net/ipv6/ip6_input.c:284
> NF_HOOK include/linux/netfilter.h:250 [inline]
> ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327
> dst_input include/net/dst.h:466 [inline]
> ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71
> NF_HOOK include/linux/netfilter.h:250 [inline]
> ipv6_rcv+0xf1f/0x1f80 net/ipv6/ip6_input.c:208
> __netif_receive_skb_core+0x1a3e/0x3450 net/core/dev.c:4461
> __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4526
> process_backlog+0x203/0x740 net/core/dev.c:5205
> napi_poll net/core/dev.c:5603 [inline]
> net_rx_action+0x792/0x1910 net/core/dev.c:5669
> __do_softirq+0x2d7/0xb85 kernel/softirq.c:285
>
> Freed by task 0:
> (stack is not available)
>
> The buggy address belongs to the object at ffff8801cbdd6a80
> which belongs to the cache TCP of size 2528
> The buggy address is located 0 bytes to the right of
> 2528-byte region [ffff8801cbdd6a80, ffff8801cbdd7460)
> The buggy address belongs to the page:
> page:000000006145927c count:1 mapcount:0 mapping:00000000d41dd7c1
> index:0xffff8801cbdd7ffd compound_mapcount: 0
> flags: 0x2fffc0000008100(slab|head)
> raw: 02fffc0000008100 ffff8801cbdd6000 ffff8801cbdd7ffd 0000000100000003
> raw: ffffea00074ef120 ffff8801d82b7248 ffff8801d798b640 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
> ffff8801cbdd7300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ffff8801cbdd7380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> > ffff8801cbdd7400: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
> ^
> ffff8801cbdd7480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8801cbdd7500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ==================================================================
>
>
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to [email protected].
>
> syzbot will keep track of this bug report.
> If you forgot to add the Reported-by tag, once the fix for this bug is
> merged
> into any tree, please reply to this email with:
> #syz fix: exact-commit-title
No longer occurring; last occurrence was on Jan 19 (commit dda3e15231b35).
The fix was commit d91c3e17f75f2:
#syz fix: net/tls: Only attach to sockets in ESTABLISHED state
- Eric