Re: general protection fault in perf_misc_flags

[Dmitry Vyukov]

On Sat, Sep 26, 2020 at 1:21 PM Borislav Petkov <bp@xxxxxxxxx> wrote:
>
> On Wed, Sep 23, 2020 at 05:20:06PM +0200, Dmitry Vyukov wrote:
> > It's a random fuzzing workload. You can get this workload by running
> > syzkaller locally:
> > https://github.com/google/syzkaller/blob/master/docs/linux/setup_ubuntu-host_qemu-vm_x86-64-kernel.md
>
> Yeah, the my.cfg example suggests that the syz-manager starts the guest
> and supplies the kernel, etc.
>
> Is there a possibility to run the workload in an already existing guest
> which I've booted prior?
>
> I'm asking because I have all the infra for testing kernels in guests
> already setup here and it would be easier for me to simply run the
> workload directly in the guest and then poke at it.

+syzkaller mailing list

There is also "isolated" VM type, which allows to connect to a set of
external machines via ssh:
https://github.com/google/syzkaller/blob/master/vm/isolated/isolated.go#L29-L37
However, it's better to have lots of them and with a console cables,
and still sometimes they may brick for various reasons.

There is also syz-stress utility that may run some workload directly
on the underlying kernel:
https://github.com/google/syzkaller/blob/master/tools/syz-stress/stress.go#L29
However, it does not use corpus/coverage, so I don't know if it will
be able to reproduce these crashes or not. It will also be up to you
then to restart the VM/fuzzing every minute.