KASAN: use-after-free Read in tcp_ack
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syzbot
Sep 10, 2019, 8:26:07 PM9/10/19
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: e2cd24b6 Linux 4.14.143
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=115f8e85600000
kernel config: https://syzkaller.appspot.com/x/.config?x=dcb6107bcdc0039
dashboard link: https://syzkaller.appspot.com/bug?extid=ab2ca73ff67fe69b8944
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+ab2ca7...@syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
==================================================================
BUG: KASAN: use-after-free in tcp_ack_probe net/ipv4/tcp_input.c:3292
[inline]
BUG: KASAN: use-after-free in tcp_ack+0x414f/0x4760
net/ipv4/tcp_input.c:3714
Read of size 4 at addr ffff8880a62790ac by task syz-executor.2/6932
CPU: 1 PID: 6932 Comm: syz-executor.2 Not tainted 4.14.143 #0
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+0x138/0x197 lib/dump_stack.c:53
print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report mm/kasan/report.c:409 [inline]
kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
tcp_ack_probe net/ipv4/tcp_input.c:3292 [inline]
tcp_ack+0x414f/0x4760 net/ipv4/tcp_input.c:3714
tcp_rcv_established+0x3e9/0x1650 net/ipv4/tcp_input.c:5555
tcp_v6_do_rcv+0x417/0x1190 net/ipv6/tcp_ipv6.c:1301
tcp_v6_rcv+0x2446/0x2ed0 net/ipv6/tcp_ipv6.c:1519
ip6_input_finish+0x300/0x15a0 net/ipv6/ip6_input.c:284
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
ip6_input+0xd5/0x340 net/ipv6/ip6_input.c:327
dst_input include/net/dst.h:468 [inline]
ip6_rcv_finish+0x23f/0x7a0 net/ipv6/ip6_input.c:71
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
ipv6_rcv+0xe4d/0x1d20 net/ipv6/ip6_input.c:208
__netif_receive_skb_core+0x1eae/0x2ca0 net/core/dev.c:4477
__netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4515
process_backlog+0x21f/0x730 net/core/dev.c:5197
napi_poll net/core/dev.c:5598 [inline]
net_rx_action+0x490/0xf80 net/core/dev.c:5664
__do_softirq+0x244/0x9a0 kernel/softirq.c:288
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1015
</IRQ>
do_softirq.part.0+0x10e/0x160 kernel/softirq.c:332
do_softirq kernel/softirq.c:324 [inline]
__local_bh_enable_ip+0x154/0x1a0 kernel/softirq.c:185
local_bh_enable include/linux/bottom_half.h:32 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:725 [inline]
ip6_finish_output2+0x9f3/0x21b0 net/ipv6/ip6_output.c:121
ip6_finish_output+0x4f4/0xb50 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip6_output+0x20f/0x6d0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:462 [inline]
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
ip6_xmit+0xd53/0x1eb0 net/ipv6/ip6_output.c:275
inet6_csk_xmit+0x286/0x4d0 net/ipv6/inet6_connection_sock.c:139
__tcp_transmit_skb+0x172c/0x2fe0 net/ipv4/tcp_output.c:1130
tcp_transmit_skb net/ipv4/tcp_output.c:1146 [inline]
tcp_write_xmit+0x523/0x4960 net/ipv4/tcp_output.c:2382
tcp_push_one+0xc1/0xf0 net/ipv4/tcp_output.c:2577
tcp_sendmsg_locked+0x157c/0x3200 net/ipv4/tcp.c:1406
tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1457
inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xce/0x110 net/socket.c:656
SYSC_sendto+0x206/0x310 net/socket.c:1763
SyS_sendto+0x40/0x50 net/socket.c:1731
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4598e9
RSP: 002b:00007fa24e36fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004598e9
RDX: 00000000fffffdda RSI: 00000000200000c0 RDI: 000000000000000b
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa24e3706d4
R13: 00000000004c7880 R14: 00000000004dd188 R15: 00000000ffffffff
Allocated by task 6932:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc mm/kasan/kasan.c:551 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489
kmem_cache_alloc_node+0x144/0x780 mm/slab.c:3642
__alloc_skb+0x9c/0x500 net/core/skbuff.c:193
alloc_skb_fclone include/linux/skbuff.h:1022 [inline]
sk_stream_alloc_skb+0xb3/0x780 net/ipv4/tcp.c:855
tcp_sendmsg_locked+0xf61/0x3200 net/ipv4/tcp.c:1301
tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1457
inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xce/0x110 net/socket.c:656
SYSC_sendto+0x206/0x310 net/socket.c:1763
SyS_sendto+0x40/0x50 net/socket.c:1731
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 6932:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3496 [inline]
kmem_cache_free+0x83/0x2b0 mm/slab.c:3758
kfree_skbmem+0x8d/0x120 net/core/skbuff.c:607
kobject: 'queues' (ffff8880a1017f48): kobject_uevent_env
__kfree_skb+0x1e/0x30 net/core/skbuff.c:646
sk_wmem_free_skb include/net/sock.h:1416 [inline]
tcp_remove_empty_skb.part.0+0x231/0x2e0 net/ipv4/tcp.c:929
tcp_remove_empty_skb net/ipv4/tcp.c:925 [inline]
tcp_sendmsg_locked+0x1ced/0x3200 net/ipv4/tcp.c:1435
tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1457
inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xce/0x110 net/socket.c:656
SYSC_sendto+0x206/0x310 net/socket.c:1763
SyS_sendto+0x40/0x50 net/socket.c:1731
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
kobject: 'queues' (ffff8880a1017f48): kobject_uevent_env: filter function
caused the event to drop!
The buggy address belongs to the object at ffff8880a6279080
which belongs to the cache skbuff_fclone_cache of size 472
The buggy address is located 44 bytes inside of
472-byte region [ffff8880a6279080, ffff8880a6279258)
The buggy address belongs to the page:
page:ffffea0002989e40 count:1 mapcount:0 mapping:ffff8880a6279080 index:0x0
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff8880a6279080 0000000000000000 0000000100000006
kobject: 'rx-0' (ffff88807f0ab610): kobject_add_internal: parent: 'queues',
set: 'queues'
raw: ffffea00029f6260 ffffea00024a20e0 ffff8880a9e82d80 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a6278f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880a6279000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8880a6279080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880a6279100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880a6279180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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 syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: e2cd24b6 Linux 4.14.143
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=115f8e85600000
kernel config: https://syzkaller.appspot.com/x/.config?x=dcb6107bcdc0039
dashboard link: https://syzkaller.appspot.com/bug?extid=ab2ca73ff67fe69b8944
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+ab2ca7...@syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
==================================================================
BUG: KASAN: use-after-free in tcp_ack_probe net/ipv4/tcp_input.c:3292
[inline]
BUG: KASAN: use-after-free in tcp_ack+0x414f/0x4760
net/ipv4/tcp_input.c:3714
Read of size 4 at addr ffff8880a62790ac by task syz-executor.2/6932
CPU: 1 PID: 6932 Comm: syz-executor.2 Not tainted 4.14.143 #0
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+0x138/0x197 lib/dump_stack.c:53
print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report mm/kasan/report.c:409 [inline]
kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
__asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
tcp_ack_probe net/ipv4/tcp_input.c:3292 [inline]
tcp_ack+0x414f/0x4760 net/ipv4/tcp_input.c:3714
tcp_rcv_established+0x3e9/0x1650 net/ipv4/tcp_input.c:5555
tcp_v6_do_rcv+0x417/0x1190 net/ipv6/tcp_ipv6.c:1301
tcp_v6_rcv+0x2446/0x2ed0 net/ipv6/tcp_ipv6.c:1519
ip6_input_finish+0x300/0x15a0 net/ipv6/ip6_input.c:284
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
ip6_input+0xd5/0x340 net/ipv6/ip6_input.c:327
dst_input include/net/dst.h:468 [inline]
ip6_rcv_finish+0x23f/0x7a0 net/ipv6/ip6_input.c:71
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
ipv6_rcv+0xe4d/0x1d20 net/ipv6/ip6_input.c:208
__netif_receive_skb_core+0x1eae/0x2ca0 net/core/dev.c:4477
__netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4515
process_backlog+0x21f/0x730 net/core/dev.c:5197
napi_poll net/core/dev.c:5598 [inline]
net_rx_action+0x490/0xf80 net/core/dev.c:5664
__do_softirq+0x244/0x9a0 kernel/softirq.c:288
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1015
</IRQ>
do_softirq.part.0+0x10e/0x160 kernel/softirq.c:332
do_softirq kernel/softirq.c:324 [inline]
__local_bh_enable_ip+0x154/0x1a0 kernel/softirq.c:185
local_bh_enable include/linux/bottom_half.h:32 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:725 [inline]
ip6_finish_output2+0x9f3/0x21b0 net/ipv6/ip6_output.c:121
ip6_finish_output+0x4f4/0xb50 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip6_output+0x20f/0x6d0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:462 [inline]
NF_HOOK include/linux/netfilter.h:250 [inline]
NF_HOOK include/linux/netfilter.h:244 [inline]
ip6_xmit+0xd53/0x1eb0 net/ipv6/ip6_output.c:275
inet6_csk_xmit+0x286/0x4d0 net/ipv6/inet6_connection_sock.c:139
__tcp_transmit_skb+0x172c/0x2fe0 net/ipv4/tcp_output.c:1130
tcp_transmit_skb net/ipv4/tcp_output.c:1146 [inline]
tcp_write_xmit+0x523/0x4960 net/ipv4/tcp_output.c:2382
tcp_push_one+0xc1/0xf0 net/ipv4/tcp_output.c:2577
tcp_sendmsg_locked+0x157c/0x3200 net/ipv4/tcp.c:1406
tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1457
inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xce/0x110 net/socket.c:656
SYSC_sendto+0x206/0x310 net/socket.c:1763
SyS_sendto+0x40/0x50 net/socket.c:1731
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4598e9
RSP: 002b:00007fa24e36fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004598e9
RDX: 00000000fffffdda RSI: 00000000200000c0 RDI: 000000000000000b
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa24e3706d4
R13: 00000000004c7880 R14: 00000000004dd188 R15: 00000000ffffffff
Allocated by task 6932:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc mm/kasan/kasan.c:551 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489
kmem_cache_alloc_node+0x144/0x780 mm/slab.c:3642
__alloc_skb+0x9c/0x500 net/core/skbuff.c:193
alloc_skb_fclone include/linux/skbuff.h:1022 [inline]
sk_stream_alloc_skb+0xb3/0x780 net/ipv4/tcp.c:855
tcp_sendmsg_locked+0xf61/0x3200 net/ipv4/tcp.c:1301
tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1457
inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xce/0x110 net/socket.c:656
SYSC_sendto+0x206/0x310 net/socket.c:1763
SyS_sendto+0x40/0x50 net/socket.c:1731
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 6932:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3496 [inline]
kmem_cache_free+0x83/0x2b0 mm/slab.c:3758
kfree_skbmem+0x8d/0x120 net/core/skbuff.c:607
kobject: 'queues' (ffff8880a1017f48): kobject_uevent_env
__kfree_skb+0x1e/0x30 net/core/skbuff.c:646
sk_wmem_free_skb include/net/sock.h:1416 [inline]
tcp_remove_empty_skb.part.0+0x231/0x2e0 net/ipv4/tcp.c:929
tcp_remove_empty_skb net/ipv4/tcp.c:925 [inline]
tcp_sendmsg_locked+0x1ced/0x3200 net/ipv4/tcp.c:1435
tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1457
inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xce/0x110 net/socket.c:656
SYSC_sendto+0x206/0x310 net/socket.c:1763
SyS_sendto+0x40/0x50 net/socket.c:1731
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
kobject: 'queues' (ffff8880a1017f48): kobject_uevent_env: filter function
caused the event to drop!
The buggy address belongs to the object at ffff8880a6279080
which belongs to the cache skbuff_fclone_cache of size 472
The buggy address is located 44 bytes inside of
472-byte region [ffff8880a6279080, ffff8880a6279258)
The buggy address belongs to the page:
page:ffffea0002989e40 count:1 mapcount:0 mapping:ffff8880a6279080 index:0x0
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff8880a6279080 0000000000000000 0000000100000006
kobject: 'rx-0' (ffff88807f0ab610): kobject_add_internal: parent: 'queues',
set: 'queues'
raw: ffffea00029f6260 ffffea00024a20e0 ffff8880a9e82d80 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a6278f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880a6279000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8880a6279080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880a6279100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880a6279180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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 syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Dec 19, 2019, 6:16:06 PM12/19/19
to syzkaller...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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