Message-ID: <CACT4Y+afO-EDmXP_+5rx91i_UVJdYNqm52A-rNUGw7xpN5Ssng@mail.gmail.com>
Date:   Mon, 26 Nov 2018 10:01:35 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     syzbot <syzbot+d89b30c46434c433dbf8@...kaller.appspotmail.com>,
        Chris von Recklinghausen <crecklin@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: WARNING: bad usercopy in corrupted (2)

On Mon, Nov 26, 2018 at 12:07 AM, Matthew Wilcox <willy@...radead.org> wrote:
>> > Hello,
>> >
>> > syzbot found the following crash on:
>> >
>> > HEAD commit:    aea0a897af9e ptp: Fix pass zero to ERR_PTR() in ptp_clock_..
>> > git tree:       net-next
>>
>> If you found it on net-next, I'd suggets cc'ing linux-net ...
>
> Uh.  I meant netdev.  Oops.

I've filed https://github.com/google/syzkaller/issues/828 for this. Thanks.


>> > console output: https://syzkaller.appspot.com/x/log.txt?x=101b91d5400000
>> > kernel config:  https://syzkaller.appspot.com/x/.config?x=c36a72af2123e78a
>> > dashboard link: https://syzkaller.appspot.com/bug?extid=d89b30c46434c433dbf8
>> > compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
>> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=170f6a47400000
>> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12e1df7b400000
>> >
>> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> > Reported-by: syzbot+d89b30c46434c433dbf8@...kaller.appspotmail.com
>> >
>> > ------------[ cut here ]------------
>> > DEBUG_LOCKS_WARN_ON(!hlock->nest_lock)
>> > ------------[ cut here ]------------
>> > Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected
>> > to SLAB object 'task_struct' (offset 1432, size 2)!
>> > WARNING: CPU: 1 PID: 38 at mm/usercopy.c:83 usercopy_warn+0xee/0x110
>> > mm/usercopy.c:78
>> > Kernel panic - not syncing: panic_on_warn set ...
>> > list_add corruption. next->prev should be prev (ffff8881daf2d798), but was
>> > 0b7e0c8e49cc0400. (next=ffff8881d9b4a4f0).
>> > CPU: 1 PID: 38 Comm: ���ف���d ������ Not tainted 4.20.0-rc3+ #312
>> > ------------[ cut here ]------------
>> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> > Google 01/01/2011
>> > kernel BUG at lib/list_debug.c:25!
>> > ------------[ cut here ]------------
>> > invalid opcode: 0000 [#1] PREEMPT SMP KASAN
>> > kernel BUG at mm/slab.c:4425!
>> > CPU: 0 PID: 8652 Comm: syz-executor607 Not tainted 4.20.0-rc3+ #312
>> > WARNING: CPU: 1 PID: 38 at kernel/rcu/tree_plugin.h:438
>> > __rcu_read_unlock+0x266/0x2e0 kernel/rcu/tree_plugin.h:432
>> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> > Google 01/01/2011
>> > Modules linked in:
>> > RIP: 0010:__list_add_valid.cold.2+0xf/0x2a lib/list_debug.c:23
>> > CPU: 1 PID: 38 Comm: ���ف���d ������ Not tainted 4.20.0-rc3+ #312
>> > Code: d1 60 88 e8 a1 37 d2 fd 0f 0b 48 89 de 48 c7 c7 60 d1 60 88 e8 90 37
>> > d2 fd 0f 0b 48 89 d9 48 c7 c7 20 d2 60 88 e8 7f 37 d2 fd <0f> 0b 48 89 f1 48
>> > c7 c7 a0 d2 60 88 48 89 de e8 6b 37 d2 fd 0f 0b
>> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> > Google 01/01/2011
>> > RSP: 0000:ffff8881dae07588 EFLAGS: 00010082
>> > usercopy: Kernel memory overwrite attempt detected to SLAB object
>> > 'signal_cache' (offset 1328, size 23)!
>> > RAX: 0000000000000075 RBX: ffff8881d9b4a4f0 RCX: 0000000000000000
>> > ------------[ cut here ]------------
>> > RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005
>> > kernel BUG at mm/usercopy.c:102!
>> > RBP: ffff8881dae075a0 R08: ffff8881d25ce100 R09: ffffed103b5c5020
>> > R10: ffffed103b5c5020 R11: ffff8881dae28107 R12: ffff8881bd890230
>> > R13: dffffc0000000000 R14: ffff8881dae07980 R15: ffff8881daf2d798
>> > FS:  000000000083c880(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000
>> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> > CR2: 00007fff14476600 CR3: 00000001d2a59000 CR4: 00000000001406f0
>> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> > Call Trace:
>> >  <IRQ>
>> >  __list_add include/linux/list.h:60 [inline]
>> >  list_add include/linux/list.h:79 [inline]
>> >  list_move include/linux/list.h:171 [inline]
>> >  detach_tasks kernel/sched/fair.c:7298 [inline]
>> >  load_balance+0x1b8d/0x39a0 kernel/sched/fair.c:8731
>> >  rebalance_domains+0x845/0xdc0 kernel/sched/fair.c:9109
>> >  run_rebalance_domains+0x38d/0x500 kernel/sched/fair.c:9731
>> >  __do_softirq+0x308/0xb7e kernel/softirq.c:292
>> >  invoke_softirq kernel/softirq.c:373 [inline]
>> >  irq_exit+0x17f/0x1c0 kernel/softirq.c:413
>> >  exiting_irq arch/x86/include/asm/apic.h:536 [inline]
>> >  smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1061
>> >  apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804
>> >  </IRQ>
>> > RIP: 0033:0x4005dd
>> > Code: c9 00 04 00 66 0f 1f 84 00 00 00 00 00 48 8b 05 f1 2e 2d 00 48 85 c0
>> > 74 11 bf 3c e8 4b 00 b9 0e 00 00 00 48 89 c6 f3 a6 75 01 <c3> 48 89 c7 e9 9a
>> > ec 01 00 66 2e 0f 1f 84 00 00 00 00 00 8b 05 4a
>> > RSP: 002b:00007fff144765a8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
>> > RAX: 0000000000000000 RBX: 0000000000000002 RCX: 00000000006d2190
>> > RDX: 0000000000402410 RSI: 0000000000000000 RDI: 0000000000000000
>> > RBP: 00000000006cc0a8 R08: 0000000000000000 R09: 0000000000000000
>> > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
>> > R13: 00000000006d2180 R14: 0000000000000000 R15: 0000000000000000
>> > Modules linked in:
>> > ---[ end trace eeb5734c13709e17 ]---
>> > invalid opcode: 0000 [#2] PREEMPT SMP KASAN
>> > CPU: 1 PID: 38 Comm: ���ف���d ������ Tainted: G      D           4.20.0-rc3+
>> > #312
>> > RIP: 0010:__list_add_valid.cold.2+0xf/0x2a lib/list_debug.c:23
>> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> > Google 01/01/2011
>> > Code: d1 60 88 e8 a1 37 d2 fd 0f 0b 48 89 de 48 c7 c7 60 d1 60 88 e8 90 37
>> > d2 fd 0f 0b 48 89 d9 48 c7 c7 20 d2 60 88 e8 7f 37 d2 fd <0f> 0b 48 89 f1 48
>> > c7 c7 a0 d2 60 88 48 89 de e8 6b 37 d2 fd 0f 0b
>> > RIP: 0010:usercopy_abort+0xbb/0xbd mm/usercopy.c:90
>> > RSP: 0000:ffff8881dae07588 EFLAGS: 00010082
>> > Code: c0 e8 f7 dc b1 ff 48 8b 55 c0 49 89 d9 4d 89 f0 ff 75 c8 4c 89 e1 4c
>> > 89 ee 48 c7 c7 80 d5 34 88 ff 75 d0 41 57 e8 e7 28 98 ff <0f> 0b e8 cc dc b1
>> > ff e8 97 13 f5 ff 8b 95 e4 fe ff ff 4c 89 e1 31
>> > RAX: 0000000000000075 RBX: ffff8881d9b4a4f0 RCX: 0000000000000000
>> > RSP: 0018:ffff8881d9b49438 EFLAGS: 00010086
>> > RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005
>> > RAX: 0000000000000068 RBX: ffffffff88291020 RCX: 0000000000000000
>> > RBP: ffff8881dae075a0 R08: ffff8881d25ce100 R09: ffffed103b5c5020
>> > RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005
>> > R10: ffffed103b5c5020 R11: ffff8881dae28107 R12: ffff8881bd890230
>> > RBP: ffff8881d9b49490 R08: ffff8881d9b4a440 R09: ffffed103b5e3ef8
>> > R13: dffffc0000000000 R14: ffff8881dae07980 R15: ffff8881daf2d798
>> > R10: ffffed103b5e3ef8 R11: ffff8881daf1f7c7 R12: ffffffff8914da1d
>> > FS:  000000000083c880(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000
>> > R13: ffffffff8834d3e0 R14: ffffffff8834d320 R15: ffffffff8834d2e0
>> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> > FS:  0000000000000000(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
>> > CR2: 00007fff14476600 CR3: 00000001d2a59000 CR4: 00000000001406f0
>> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> > CR2: 0000000000000130 CR3: 00000001d7880000 CR4: 00000000001406e0
>> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> > Call Trace:
>> > Modules linked in:
>> > ---[ end trace eeb5734c13709e18 ]---
>> > RIP: 0010:__list_add_valid.cold.2+0xf/0x2a lib/list_debug.c:23
>> > Code: d1 60 88 e8 a1 37 d2 fd 0f 0b 48 89 de 48 c7 c7 60 d1 60 88 e8 90 37
>> > d2 fd 0f 0b 48 89 d9 48 c7 c7 20 d2 60 88 e8 7f 37 d2 fd <0f> 0b 48 89 f1 48
>> > c7 c7 a0 d2 60 88 48 89 de e8 6b 37 d2 fd 0f 0b
>> > RSP: 0000:ffff8881dae07588 EFLAGS: 00010082
>> > RAX: 0000000000000075 RBX: ffff8881d9b4a4f0 RCX: 0000000000000000
>> > RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005
>> > RBP: ffff8881dae075a0 R08: ffff8881d25ce100 R09: ffffed103b5c5020
>> > R10: ffffed103b5c5020 R11: ffff8881dae28107 R12: ffff8881bd890230
>> > R13: dffffc0000000000 R14: ffff8881dae07980 R15: ffff8881daf2d798
>> > FS:  0000000000000000(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
>> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> > CR2: 0000000000000130 CR3: 00000001d7880000 CR4: 00000000001406e0
>> > 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@...glegroups.com.
>> >
>> > 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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