linux-kernel - Re: general protection fault in perf_misc

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Message-ID: <20200928202353.GI1685@zn.tnic>
Date:   Mon, 28 Sep 2020 22:23:53 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.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>
Subject: Re: general protection fault in perf_misc_flags

On Mon, Sep 28, 2020 at 12:33:57PM +0200, Dmitry Vyukov wrote:
> It may be related to VMs, but also may well not be related to VMs.

Right, and so I tried to set it up on a test box here, it looks like
it worked, see below. I'll let it fuzz in the coming days and see what
explodes...

2020/09/28 22:19:51 booting test machines...
2020/09/28 22:19:51 wait for the connection from test machine...
2020/09/28 22:20:27 machine check:
2020/09/28 22:20:27 syscalls                : 3389/3739
2020/09/28 22:20:27 code coverage           : enabled
2020/09/28 22:20:27 comparison tracing      : enabled
2020/09/28 22:20:27 extra coverage          : enabled
2020/09/28 22:20:27 setuid sandbox          : enabled
2020/09/28 22:20:27 namespace sandbox       : enabled
2020/09/28 22:20:27 Android sandbox         : enabled
2020/09/28 22:20:27 fault injection         : enabled
2020/09/28 22:20:27 leak checking           : CONFIG_DEBUG_KMEMLEAK is not enabled
2020/09/28 22:20:27 net packet injection    : enabled
2020/09/28 22:20:27 net device setup        : enabled
2020/09/28 22:20:27 concurrency sanitizer   : /sys/kernel/debug/kcsan does not exist
2020/09/28 22:20:27 devlink PCI setup       : PCI device 0000:00:10.0 is not available
2020/09/28 22:20:27 USB emulation           : enabled
2020/09/28 22:20:27 hci packet injection    : enabled
2020/09/28 22:20:27 wifi device emulation   : enabled
2020/09/28 22:20:29 corpus                  : 458 (deleted 0 broken)
2020/09/28 22:20:31 seeds                   : 620/667
2020/09/28 22:20:31 VMs 1, executed 0, corpus cover 0, corpus signal 0, max signal 0, crashes 0, repro 0
2020/09/28 22:20:41 VMs 2, executed 12, corpus cover 0, corpus signal 0, max signal 0, crashes 0, repro 0
2020/09/28 22:20:51 VMs 2, executed 28, corpus cover 5578, corpus signal 5925, max signal 10155, crashes 0, repro 0
2020/09/28 22:21:01 VMs 3, executed 179, corpus cover 11792, corpus signal 10881, max signal 19337, crashes 0, repro 0
...


-- 
Regards/Gruss,
    Boris.

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