Re: KASAN: stack-out-of-bounds Read in corrupted (3)

[Dmitry Vyukov]

On Wed, Jan 2, 2019 at 2:01 PM syzbot
<syzbot+2ab493acb9d8329345a3@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    28e8c4bc8eb4 Merge tag 'rtc-4.21' of git://git.kernel.org/..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=122355bf400000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c2ab9708c613a224
> dashboard link: https://syzkaller.appspot.com/bug?extid=2ab493acb9d8329345a3
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=106e29e7400000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+2ab493acb9d8329345a3@xxxxxxxxxxxxxxxxxxxxxxxxx

A random manifestation of the stack overflow/corruption:

#syz dup: kernel panic: stack is corrupted in udp4_lib_lookup2

See https://groups.google.com/forum/#!msg/syzkaller-bugs/vr87kmG5qRI/31nOcuVsFgAJ


> ------------[ cut here ]------------
> ==================================================================
> DEBUG_LOCKS_WARN_ON(current->hardirq_context)
> ------------[ cut here ]------------
> BUG: KASAN: stack-out-of-bounds in debug_spin_lock_before
> kernel/locking/spinlock_debug.c:83 [inline]
> BUG: KASAN: stack-out-of-bounds in do_raw_spin_lock+0x303/0x360
> kernel/locking/spinlock_debug.c:112
> Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected
> to SLAB object 'task_struct' (offset 912, size 2)!
> Read of size 4 at addr ffff8880a9466a44 by task kworker/1:0/7562
> WARNING: CPU: 0 PID: -1455013312 at mm/usercopy.c:78
> usercopy_warn+0xeb/0x110 mm/usercopy.c:78
>
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 1 PID: 7562 Comm: kworker/1:0 Not tainted 4.20.0+ #4
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: rcu_gp process_srcu
> Call Trace:
>   <IRQ>
>   __dump_stack lib/dump_stack.c:77 [inline]
>   dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
>   print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
>   kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
>   __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134
>   debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
>   do_raw_spin_lock+0x303/0x360 kernel/locking/spinlock_debug.c:112
>   __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline]
>   _raw_spin_lock_irqsave+0x9d/0xcd kernel/locking/spinlock.c:152
>   try_to_wake_up+0xb9/0x1480 kernel/sched/core.c:1965
>   wake_up_process+0x10/0x20 kernel/sched/core.c:2129
>   process_timeout+0x31/0x40 kernel/time/timer.c:1732
>   call_timer_fn+0x254/0x900 kernel/time/timer.c:1325
>   expire_timers kernel/time/timer.c:1362 [inline]
>   __run_timers+0x6fc/0xd50 kernel/time/timer.c:1681
>   run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694
>   __do_softirq+0x30b/0xb11 kernel/softirq.c:292
>   invoke_softirq kernel/softirq.c:373 [inline]
>   irq_exit+0x180/0x1d0 kernel/softirq.c:413
>   exiting_irq arch/x86/include/asm/apic.h:536 [inline]
>   smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062
>   apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
>   </IRQ>
> RIP: 0010:rdtsc arch/x86/include/asm/msr.h:207 [inline]
> RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:232 [inline]
> RIP: 0010:delay_tsc+0x4c/0xc0 arch/x86/lib/delay.c:61
> Code: e8 0f 31 48 c1 e2 20 48 09 c2 49 89 d4 eb 16 f3 90 bf 01 00 00 00 e8
> 33 70 68 f9 e8 de 5c a0 fb 44 39 e8 75 36 0f ae e8 0f 31 <48> c1 e2 20 48
> 89 d3 48 09 c3 48 89 d8 4c 29 e0 4c 39 f0 73 24 bf
> RSP: 0018:ffff8880891af5a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
> RAX: 00000000f513364d RBX: 00000201f5133563 RCX: ffffffff838fb3ca
> RDX: 0000000000000201 RSI: ffffffff838fb3d8 RDI: 0000000000000005
> RBP: ffff8880891af5c0 R08: ffff88808f0ec240 R09: fffffbfff16af64d
> R10: ffff8880891af710 R11: ffffffff8b57b267 R12: 00000201f51326c9
> R13: 0000000000000001 R14: 0000000000002ced R15: ffffffff8b57aec0
>   __delay arch/x86/lib/delay.c:161 [inline]
>   __const_udelay+0x5f/0x80 arch/x86/lib/delay.c:175
>   try_check_zero+0x352/0x5c0 kernel/rcu/srcutree.c:730
>   srcu_advance_state kernel/rcu/srcutree.c:1167 [inline]
>   process_srcu+0x642/0x1400 kernel/rcu/srcutree.c:1261
>   process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153
>   worker_thread+0x143/0x14a0 kernel/workqueue.c:2296
>   kthread+0x357/0x430 kernel/kthread.c:246
>   ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
>
> CPU: 0 PID: -1455013312 Comm:  Not tainted 4.20.0+ #4
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Allocated by task 2839968544:
> Call Trace:
> BUG: unable to handle kernel paging request at ffffffff8cf07580
> #PF error: [normal kernel read fault]
> PGD 9871067 P4D 9871067 PUD 9872063 PMD 0
> Oops: 0000 [#1] PREEMPT SMP KASAN
> CPU: 1 PID: 7562 Comm: kworker/1:0 Not tainted 4.20.0+ #4
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: rcu_gp process_srcu
> RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:202
> Code: 36 0f 23 fe e9 20 fe ff ff 48 89 df e8 29 0f 23 fe e9 f1 fd ff ff 90
> 90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 80
> 31 f4 8b 8b 47 0c 48 83 c7 18 c7 46 10 00 00 00 00
> RSP: 0018:ffff8880ae707640 EFLAGS: 00010006
> RAX: 00000000001f8880 RBX: ffff8880a9467a44 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffff8880ae707648 RDI: 0000000000003ff0
> RBP: ffff8880ae707670 R08: 000000000000001d R09: ffffed1015ce3ef9
> R10: ffffed1015ce3ef8 R11: ffff8880ae71f7c7 R12: ffffea0002a51980
> R13: ffff8880a9466a44 R14: ffff8880aa13d900 R15: ffff8880a9467a40
> FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffffff8cf07580 CR3: 0000000099fe2000 CR4: 00000000001406e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>   <IRQ>
>   describe_object mm/kasan/report.c:158 [inline]
>   print_address_description.cold+0x16a/0x20d mm/kasan/report.c:194
>   kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
>   __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134
>   debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
>   do_raw_spin_lock+0x303/0x360 kernel/locking/spinlock_debug.c:112
>   __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline]
>   _raw_spin_lock_irqsave+0x9d/0xcd kernel/locking/spinlock.c:152
>   try_to_wake_up+0xb9/0x1480 kernel/sched/core.c:1965
>   wake_up_process+0x10/0x20 kernel/sched/core.c:2129
>   process_timeout+0x31/0x40 kernel/time/timer.c:1732
>   call_timer_fn+0x254/0x900 kernel/time/timer.c:1325
>   expire_timers kernel/time/timer.c:1362 [inline]
>   __run_timers+0x6fc/0xd50 kernel/time/timer.c:1681
>   run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694
>   __do_softirq+0x30b/0xb11 kernel/softirq.c:292
>   invoke_softirq kernel/softirq.c:373 [inline]
>   irq_exit+0x180/0x1d0 kernel/softirq.c:413
>   exiting_irq arch/x86/include/asm/apic.h:536 [inline]
>   smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062
>   apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
>   </IRQ>
> RIP: 0010:rdtsc arch/x86/include/asm/msr.h:207 [inline]
> RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:232 [inline]
> RIP: 0010:delay_tsc+0x4c/0xc0 arch/x86/lib/delay.c:61
> Code: e8 0f 31 48 c1 e2 20 48 09 c2 49 89 d4 eb 16 f3 90 bf 01 00 00 00 e8
> 33 70 68 f9 e8 de 5c a0 fb 44 39 e8 75 36 0f ae e8 0f 31 <48> c1 e2 20 48
> 89 d3 48 09 c3 48 89 d8 4c 29 e0 4c 39 f0 73 24 bf
> RSP: 0018:ffff8880891af5a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
> RAX: 00000000f513364d RBX: 00000201f5133563 RCX: ffffffff838fb3ca
> RDX: 0000000000000201 RSI: ffffffff838fb3d8 RDI: 0000000000000005
> RBP: ffff8880891af5c0 R08: ffff88808f0ec240 R09: fffffbfff16af64d
> R10: ffff8880891af710 R11: ffffffff8b57b267 R12: 00000201f51326c9
> R13: 0000000000000001 R14: 0000000000002ced R15: ffffffff8b57aec0
>   __delay arch/x86/lib/delay.c:161 [inline]
>   __const_udelay+0x5f/0x80 arch/x86/lib/delay.c:175
>   try_check_zero+0x352/0x5c0 kernel/rcu/srcutree.c:730
>   srcu_advance_state kernel/rcu/srcutree.c:1167 [inline]
>   process_srcu+0x642/0x1400 kernel/rcu/srcutree.c:1261
>   process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153
>   worker_thread+0x143/0x14a0 kernel/workqueue.c:2296
>   kthread+0x357/0x430 kernel/kthread.c:246
>   ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
> Modules linked in:
> CR2: ffffffff8cf07580
> ---[ end trace 7f399f30ebf94723 ]---
> RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:202
> Code: 36 0f 23 fe e9 20 fe ff ff 48 89 df e8 29 0f 23 fe e9 f1 fd ff ff 90
> 90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 80
> 31 f4 8b 8b 47 0c 48 83 c7 18 c7 46 10 00 00 00 00
> RSP: 0018:ffff8880ae707640 EFLAGS: 00010006
> RAX: 00000000001f8880 RBX: ffff8880a9467a44 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffff8880ae707648 RDI: 0000000000003ff0
> RBP: ffff8880ae707670 R08: 000000000000001d R09: ffffed1015ce3ef9
> R10: ffffed1015ce3ef8 R11: ffff8880ae71f7c7 R12: ffffea0002a51980
> R13: ffff8880a9466a44 R14: ffff8880aa13d900 R15: ffff8880a9467a40
> FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffffff8cf07580 CR3: 0000000099fe2000 CR4: 00000000001406e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Shutting down cpus with NMI
> usercopy: Kernel memory overwrite attempt detected to SLAB
> object 'sighand_cache' (offset 2320, size 2)!
> ------------[ cut here ]------------
> kernel BUG at mm/usercopy.c:102!
> WARNING: CPU: 0 PID: -1455013312 at kernel/rcu/tree_plugin.h:414
> __rcu_read_lock+0x75/0x90 kernel/rcu/tree_plugin.h:416
> Modules linked in:
> CPU: 0 PID: -1455013312 Comm:  Tainted: G      D           4.20.0+ #4
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:__rcu_read_lock+0x75/0x90 kernel/rcu/tree_plugin.h:414
> Code: 00 48 8d bb 70 03 00 00 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 04
> 3c 03 7e 14 81 bb 70 03 00 00 ff ff ff 3f 7f 03 5b 5d c3 <0f> 0b 5b 5d c3
> e8 61 db 59 00 eb e5 e8 5a db 59 00 eb aa 0f 1f 84
> RSP: 0018:ffff8880a9463850 EFLAGS: 00010012
> RAX: 0000000000000000 RBX: ffff8880a9464240 RCX: ffffffff816b545f
> RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880a94645b0
> RBP: ffff8880a9463858 R08: ffff8880a9464240 R09: 0000000000000004
> R10: ffffed1015cc3ef8 R11: ffff8880ae61f7c7 R12: 0000000000000000
> R13: 0000000000000008 R14: ffff8880a94638d0 R15: ffff8880a94639d8
> FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f1524df3169 CR3: 000000008509b000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> irq event stamp: 2321324489
> hardirqs last  enabled at (2170814927): [<ffffed101528c974>]
> 0xffffed101528c974
> hardirqs last disabled at (2321324489): [<ffffffff8167a729>]
> vprintk_emit+0x169/0x960 kernel/printk/printk.c:1911
> softirqs last  enabled at (0): [<ffffffff86e92120>] gue6_err+0x0/0x6b0
> net/ipv6/fou6.c:86
> softirqs last disabled at (1): [<0000000000000001>] 0x1
> ---[ end trace 7f399f30ebf94724 ]---
> invalid opcode: 0000 [#2] PREEMPT SMP KASAN
> CPU: 0 PID: -1455013312 Comm:  Tainted: G      D W         4.20.0+ #4
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:usercopy_abort+0xbd/0xbf mm/usercopy.c:102
> Code: c0 e8 0d 0b b2 ff 48 8b 55 c0 49 89 d9 4d 89 f0 ff 75 c8 4c 89 e1 4c
> 89 ee 48 c7 c7 00 27 55 88 ff 75 d0 41 57 e8 5d 4b 98 ff <0f> 0b e8 e2 0a
> b2 ff e8 dd af f5 ff 8b 95 20 ff ff ff 4c 89 e1 31
> RSP: 0018:ffff8880a9463a80 EFLAGS: 00010086
> RAX: 0000000000000068 RBX: ffffffff88494720 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffffffff8167d666 RDI: ffffed101528c742
> RBP: ffff8880a9463ad8 R08: 0000000000000068 R09: ffffed1015cc3ef9
> R10: ffffed1015cc3ef8 R11: ffff8880ae61f7c7 R12: ffffffff893bcfb5
> R13: ffffffff88552560 R14: ffffffff885524a0 R15: ffffffff88552460
> FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f1524df3169 CR3: 000000008509b000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> Modules linked in:
> ---[ end trace 7f399f30ebf94725 ]---
> RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:202
> Code: 36 0f 23 fe e9 20 fe ff ff 48 89 df e8 29 0f 23 fe e9 f1 fd ff ff 90
> 90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 80
> 31 f4 8b 8b 47 0c 48 83 c7 18 c7 46 10 00 00 00 00
> RSP: 0018:ffff8880ae707640 EFLAGS: 00010006
> RAX: 00000000001f8880 RBX: ffff8880a9467a44 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffff8880ae707648 RDI: 0000000000003ff0
> RBP: ffff8880ae707670 R08: 000000000000001d R09: ffffed1015ce3ef9
> R10: ffffed1015ce3ef8 R11: ffff8880ae71f7c7 R12: ffffea0002a51980
> R13: ffff8880a9466a44 R14: ffff8880aa13d900 R15: ffff8880a9467a40
> FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f1524df3169 CR3: 000000008509b000 CR4: 00000000001406f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>
>
> ---
> 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@xxxxxxxxxxxxxxxxx
>
> 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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