linux-kernel - Re: BUG: unable to handle kernel paging request in hrtimer

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Message-ID: <CACT4Y+ZarLOBUUAnp7AMRuicCpOTc-t89wE3G4HNCzRO82w0jQ@mail.gmail.com>
Date:   Wed, 19 Jun 2019 20:57:45 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+037e18398ba8c655a652@...kaller.appspotmail.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>, bpf <bpf@...r.kernel.org>
Subject: Re: BUG: unable to handle kernel paging request in hrtimer_interrupt

On Wed, Jun 19, 2019 at 5:57 PM syzbot
<syzbot+037e18398ba8c655a652@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    29f785ff Merge branch 'fixes' of git://git.kernel.org/pub/..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=10539ceaa00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e5c77f8090a3b96b
> dashboard link: https://syzkaller.appspot.com/bug?extid=037e18398ba8c655a652
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16da8cc9a00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+037e18398ba8c655a652@...kaller.appspotmail.com

The same bpf plague bug...
+bpf mailing list

> kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
> BUG: unable to handle page fault for address: ffff88807a92fb10
> #PF: supervisor instruction fetch in kernel mode
> #PF: error_code(0x0011) - permissions violation
> PGD b401067 P4D b401067 PUD 80000000400001e3
> Thread overran stack, or stack corrupted
> Oops: 0011 [#1] PREEMPT SMP KASAN
> CPU: 1 PID: 9205 Comm: syz-executor.0 Not tainted 5.2.0-rc5+ #2
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:0xffff88807a92fb10
> Code: ff ff 15 b8 0d 86 ff ff ff ff 00 b5 0d 86 ff ff ff ff 40 8c f0 89 80
> 88 ff ff 00 00 00 00 00 00 00 00 a0 a9 1d 8b ff ff ff ff <40> fb 92 7a 80
> 88 ff ff 15 b8 0d 86 ff ff ff ff 00 b5 0d 86 ff ff
> RSP: 0018:ffff8880ae909e10 EFLAGS: 00010006
> RAX: ffff88807a92fb10 RBX: 0000000000000000 RCX: ffffffff816162e2
> RDX: 0000000000010000 RSI: ffffffff81615cdf RDI: ffff88807a92fab8
> RBP: ffff8880ae909f08 R08: ffff888092914180 R09: ffffed1015d26c70
> R10: ffffed1015d26c6f R11: ffff8880ae93637b R12: ffff8880ae926d80
> R13: ffffffff8b1da9a0 R14: ffff88807a92fab8 R15: dffffc0000000000
> FS:  0000555557401940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffff88807a92fb10 CR3: 000000009016a000 CR4: 00000000001406e0
> Call Trace:
>   <IRQ>
>   hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
>   local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
>   smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1066
>   apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806
>   </IRQ>
> Modules linked in:
> CR2: ffff88807a92fb10
> ---[ end trace f7934f1b1fe3f476 ]---
> RIP: 0010:0xffff88807a92fb10
> Code: ff ff 15 b8 0d 86 ff ff ff ff 00 b5 0d 86 ff ff ff ff 40 8c f0 89 80
> 88 ff ff 00 00 00 00 00 00 00 00 a0 a9 1d 8b ff ff ff ff <40> fb 92 7a 80
> 88 ff ff 15 b8 0d 86 ff ff ff ff 00 b5 0d 86 ff ff
> RSP: 0018:ffff8880ae909e10 EFLAGS: 00010006
> RAX: ffff88807a92fb10 RBX: 0000000000000000 RCX: ffffffff816162e2
> RDX: 0000000000010000 RSI: ffffffff81615cdf RDI: ffff88807a92fab8
> RBP: ffff8880ae909f08 R08: ffff888092914180 R09: ffffed1015d26c70
> R10: ffffed1015d26c6f R11: ffff8880ae93637b R12: ffff8880ae926d80
> R13: ffffffff8b1da9a0 R14: ffff88807a92fab8 R15: dffffc0000000000
> FS:  0000555557401940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffff88807a92fb10 CR3: 000000009016a000 CR4: 00000000001406e0
>
>
> ---
> 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#status 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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