Re: Syzkaller found a bug: general protection fault in x86_pmu_enable_event

[Borislav Petkov]

On Thu, Nov 10, 2022 at 01:47:26PM -0500, Sanan Hasanov wrote:
> Good day, dear maintainers,
> 
> We found a bug using a modified kernel configuration file used by syzbot.
> We enhanced the coverage of the configuration file using our tool, krepair.
> config and reproducer files are attached.
> Branch: https://github.com/torvalds/linux (HEAD detached at 33c9805860e58)
> Reproducer can be executed as follows:
> ./syz-execprog -repeat=0 -procs=8 program
> More info: https://github.com/google/syzkaller/blob/master/docs/executing_syzkaller_programs.md
> Thank you!
> 
> general protection fault, probably for non-canonical address
> 0xdffffc0000000033: 0000 [#1] PREEMPT SMP KASAN NOPTI
> KASAN: null-ptr-deref in range [0x0000000000000198-0x000000000000019f]
> CPU: 0 PID: 7030 Comm: systemd-udevd Not tainted
> 6.1.0-rc1-00010-gbb1a1146467a #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 1.13.0-1ubuntu1.1 04/01/2014
> RIP: 0010:x86_pmu_enable_event+0x61/0x2b0
> Code: 00 e8 93 95 3a 00 48 c7 c7 40 59 60 85 e8 47 17 a4 02 48 8d bb
> 98 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6
> 04 02 65 48 8b 2d 0b 46 a1 7d 84 c0 74 08 3c 03 0f 8e f3 01
> RSP: 0000:ffff88811ae09ce8 EFLAGS: 00010016
> RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8260e90d
> RDX: 0000000000000033 RSI: ffffffff85605940 RDI: 0000000000000198
> RBP: ffff88811ae21e20 R08: 0000000000000001 R09: ffffed10235c43c5
> R10: ffff88811ae21e27 R11: ffffed10235c43c4 R12: 0000000000000007
> R13: ffff88811ae21c20 R14: fffffbfff0cf1d0f R15: 0000000000000004
> FS:  00007f2607dbb8c0(0000) GS:ffff88811ae00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00005606fbe35108 CR3: 000000010c384000 CR4: 0000000000350ef0
> DR0: 0000000003be2348 DR1: 0000000003be2348 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000600
> Call Trace:
>  <IRQ>
>  amd_pmu_enable_all+0x101/0x160
>  x86_pmu_enable+0x367/0xcb0
>  perf_pmu_enable+0xb6/0xf0
>  perf_mux_hrtimer_handler+0x4c0/0x880
>  __hrtimer_run_queues+0x2cf/0x6c0
>  hrtimer_interrupt+0x2f3/0x700
>  __sysvec_apic_timer_interrupt+0x114/0x370
>  sysvec_apic_timer_interrupt+0x89/0xc0

Looks like

baa014b9543c ("perf/x86/amd: Fix crash due to race between amd_pmu_enable_all, perf NMI and throttling")

which just went to Linus.

You could try 6.1-rc6 when it releases tomorrow.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette