linux-kernel - Re: general protection fault in perf_misc

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Message-ID: <CACT4Y+YbEhu2XHoPT9g7Bi7fhjqCkXMBhgjH5yqm7vHy3UEHjw@mail.gmail.com>
Date:   Sat, 26 Sep 2020 14:08:27 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        syzbot <syzbot+ce179bc99e64377c24bc@...kaller.appspotmail.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Jiri Olsa <jolsa@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: general protection fault in perf_misc_flags

On Sat, Sep 26, 2020 at 1:21 PM Borislav Petkov <bp@...en8.de> 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.