syzbot

 sign-in | mailing list | source | docs
🐞 Open [717]
🐞 Fixed [181]
🐞 Invalid [640]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
💬 Send us feedback

KASAN: use-after-free Read in dev_queue_xmit_nit (2)

Status: upstream: reported syz repro on 2020/06/02 08:57
Reported-by: syzbot+d27cdc6d1f87b2c65bf5@syzkaller.appspotmail.com
First crash: 1636d, last: 845d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-414 KASAN: use-after-free Read in dev_queue_xmit_nit 1 1837d 1837d 0/1 auto-closed as invalid on 2020/03/12 11:34
upstream KASAN: use-after-free Read in dev_queue_xmit_nit (3) net 3 2255d 2266d 0/28 closed as invalid on 2018/12/05 17:50
upstream KASAN: use-after-free Read in dev_queue_xmit_nit (2) net syz 2 2557d 2559d 0/28 closed as invalid on 2018/01/22 17:57
linux-4.19 KASAN: use-after-free Read in dev_queue_xmit_nit C error 90 658d 1859d 0/1 upstream: reported C repro on 2019/10/22 19:23
upstream KASAN: use-after-free Read in dev_queue_xmit_nit C 13 2617d 2629d 3/28 fixed on 2017/11/06 08:47
linux-4.14 KASAN: use-after-free Read in dev_queue_xmit_nit 5 1871d 1981d 0/1 auto-closed as invalid on 2020/02/08 07:01
android-5-15 BUG: unable to handle kernel NULL pointer dereference in dev_queue_xmit_nit origin:downstream C inconclusive 1 212d 342d 0/2 auto-obsoleted due to no activity on 2024/08/03 17:32
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2023/03/03 04:32 1m retest repro linux-4.14.y error
2022/11/12 07:30 9m retest repro linux-4.14.y report log

Sample crash report:
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
==================================================================
BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:183 [inline]
BUG: KASAN: use-after-free in dev_queue_xmit_nit+0x7b5/0x950 net/core/dev.c:1925
Read of size 8 at addr ffff8880b4ef0968 by task syz-executor.0/12899

CPU: 0 PID: 12899 Comm: syz-executor.0 Not tainted 4.14.206-syzkaller #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+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 __read_once_size include/linux/compiler.h:183 [inline]
 dev_queue_xmit_nit+0x7b5/0x950 net/core/dev.c:1925
 xmit_one net/core/dev.c:3001 [inline]
 dev_hard_start_xmit+0xaa/0x890 net/core/dev.c:3021
 __dev_queue_xmit+0x1d7f/0x2480 net/core/dev.c:3521
 neigh_hh_output include/net/neighbour.h:490 [inline]
 neigh_output include/net/neighbour.h:498 [inline]
 ip6_finish_output2+0xc6a/0x1f10 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x60c/0xaf0 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:239 [inline]
 ip6_output+0x1c5/0x660 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:470 [inline]
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ndisc_send_skb+0x82a/0x1390 net/ipv6/ndisc.c:483
 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677
 addrconf_rs_timer+0x2bb/0x5a0 net/ipv6/addrconf.c:3765
 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280
 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319
 __run_timers kernel/time/timer.c:1644 [inline]
 run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1657
 __do_softirq+0x254/0xa1d kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x193/0x240 kernel/softirq.c:409
 exiting_irq arch/x86/include/asm/apic.h:648 [inline]
 smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:192
RSP: 0018:ffff88808dbbfaf8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff11e1231 RBX: 0000000000000282 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffff888097880908 RDI: 0000000000000282
RBP: ffffffff8c069a48 R08: ffffffff8b9b3130 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888097158000
R13: 0000000000000000 R14: ffffffff8c069a48 R15: 0000000000000000
 __debug_check_no_obj_freed lib/debugobjects.c:760 [inline]
 debug_check_no_obj_freed+0x2c0/0x674 lib/debugobjects.c:776
 free_pages_prepare mm/page_alloc.c:1064 [inline]
 __free_pages_ok+0x215/0xeb0 mm/page_alloc.c:1262
 free_thread_stack kernel/fork.c:262 [inline]
 release_task_stack kernel/fork.c:347 [inline]
 put_task_stack+0xa0/0x1c0 kernel/fork.c:358
 finish_task_switch+0x42c/0x610 kernel/sched/core.c:2692
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x893/0x1de0 kernel/sched/core.c:3384
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:3508
 ___preempt_schedule+0x16/0x18
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
 _raw_spin_unlock_irqrestore+0xaf/0xe0 kernel/locking/spinlock.c:192
 __rcu_read_unlock+0x158/0x160 kernel/rcu/update.c:260
 rcu_read_unlock include/linux/rcupdate.h:684 [inline]
 __sock_create+0x2af/0x620 net/socket.c:1273
 sock_create net/socket.c:1315 [inline]
 SYSC_socket net/socket.c:1345 [inline]
 SyS_socket+0xd1/0x1b0 net/socket.c:1325
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45deb9
RSP: 002b:00007fc949498c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000034cc0 RCX: 000000000045deb9
RDX: 0000000000000300 RSI: 0000000000000003 RDI: 0000000000000011
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffed854dd0f R14: 00007fc9494999c0 R15: 000000000118bf2c

Allocated by task 12903:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15a/0x400 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 sk_prot_alloc+0x1ba/0x290 net/core/sock.c:1467
 sk_alloc+0x36/0xcd0 net/core/sock.c:1521
 packet_create+0xf5/0x7f0 net/packet/af_packet.c:3295
 __sock_create+0x303/0x620 net/socket.c:1275
 sock_create net/socket.c:1315 [inline]
 SYSC_socket net/socket.c:1345 [inline]
 SyS_socket+0xd1/0x1b0 net/socket.c:1325
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 12898:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 sk_prot_free net/core/sock.c:1504 [inline]
 __sk_destruct+0x5e3/0x760 net/core/sock.c:1582
 sk_destruct net/core/sock.c:1597 [inline]
 __sk_free+0xd9/0x2d0 net/core/sock.c:1605
 sk_free+0x2b/0x40 net/core/sock.c:1616
 sock_put include/net/sock.h:1662 [inline]
 packet_release+0x837/0xa80 net/packet/af_packet.c:3124
 __sock_release+0xcd/0x2b0 net/socket.c:602
 sock_close+0x15/0x20 net/socket.c:1139
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff8880b4ef0180
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 2024 bytes inside of
 2048-byte region [ffff8880b4ef0180, ffff8880b4ef0980)
The buggy address belongs to the page:
page:ffffea0002d3bc00 count:1 mapcount:0 mapping:ffff8880b4ef0180 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff8880b4ef0180 0000000000000000 0000000100000003
raw: ffffea0002d46520 ffffea0002d34ea0 ffff88813fe82c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880b4ef0800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880b4ef0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880b4ef0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff8880b4ef0980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880b4ef0a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (18):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/11/18 01:43 linux-4.14.y 27ce4f2a6817 09323409 .config console log report syz ci2-linux-4-14
2022/08/02 02:42 linux-4.14.y b641242202ed fef302b1 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in dev_queue_xmit_nit
2022/07/22 15:22 linux-4.14.y 9c3bf9cf362f 22343af4 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in dev_queue_xmit_nit
2022/02/08 21:42 linux-4.14.y 21ad423fe521 0b33604d .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in dev_queue_xmit_nit
2022/01/18 00:16 linux-4.14.y 4ba8e26127c3 731a2d23 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in dev_queue_xmit_nit
2021/12/24 23:50 linux-4.14.y 8ee0807eedf3 6caa12e4 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in dev_queue_xmit_nit
2021/12/12 17:56 linux-4.14.y c01d4d1b885d 49ca1f59 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in dev_queue_xmit_nit
2021/12/07 10:45 linux-4.14.y 66722c42ec91 0230ba3e .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in dev_queue_xmit_nit
2021/04/07 12:05 linux-4.14.y 0cc244011f40 6a81331a .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in dev_queue_xmit_nit
2021/02/20 10:22 linux-4.14.y 29c52025152b 3e5ed8b4 .config console log report info ci2-linux-4-14 KASAN: use-after-free Read in dev_queue_xmit_nit
2020/12/06 08:59 linux-4.14.y c196b3a9c83a f12ba0c5 .config console log report info ci2-linux-4-14
2020/10/03 16:15 linux-4.14.y cbfa1702aaf6 1a3f9408 .config console log report info ci2-linux-4-14
2020/08/27 06:34 linux-4.14.y d7e78d08fa77 816e0689 .config console log report ci2-linux-4-14
2020/08/21 09:01 linux-4.14.y 6a24ca2506d6 1d75fe45 .config console log report ci2-linux-4-14
2020/08/18 01:14 linux-4.14.y 14b58326976d 5ce13532 .config console log report ci2-linux-4-14
2020/06/26 17:27 linux-4.14.y b850307b279c 9506ea6d .config console log report ci2-linux-4-14
2020/06/18 15:07 linux-4.14.y b850307b279c 3ea11d3f .config console log report ci2-linux-4-14
2020/06/02 08:56 linux-4.14.y 4f68020fef1c a0331e89 .config console log report ci2-linux-4-14
* Struck through repros no longer work on HEAD.