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From: Dmitry Vyukov <dvyukov@google.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Alexander Potapenko <glider@google.com>,
	Marco Elver <elver@google.com>,
	syzbot <syzbot+ce179bc99e64377c24bc@syzkaller.appspotmail.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Jiri Olsa <jolsa@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Ingo Molnar <mingo@redhat.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	clang-built-linux <clang-built-linux@googlegroups.com>
Subject: Re: general protection fault in perf_misc_flags
Date: Mon, 28 Sep 2020 12:33:57 +0200	[thread overview]
Message-ID: <CACT4Y+Z4Y6SJJ6iYBhVRiknrWBAD6gGhQXiXLhxPniDNBFJGsA@mail.gmail.com> (raw)
In-Reply-To: <20200928085401.GE1685@zn.tnic>

On Mon, Sep 28, 2020 at 10:54 AM Borislav Petkov <bp@alien8.de> wrote:
>
> On Mon, Sep 28, 2020 at 10:40:19AM +0200, Dmitry Vyukov wrote:
> > I meant the kernel self-corrupts itself, that just wasn't detected by
> > KASAN, page protections, etc.
>
> Well, Nick already asked this but we're marking all kernel text RO early
> during boot. So it either is happening before that or something else
> altogether is going on.
>
> And if that is a kernel issue, I believe we should've heard by now from
> others. Or maybe this happens only in VMs.
>
> Questions over questions...

I don't have answers to all of the questions, but syzkaller produces a
pretty unique workload. It has found thousands of bugs that you have
not heard from others:
https://syzkaller.appspot.com/upstream#open
https://syzkaller.appspot.com/upstream/fixed
In particular there are hundreds of known and active potential memory
corruption bugs.

It may be related to VMs, but also may well not be related to VMs.

  reply	other threads:[~2020-09-28 10:34 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-19  8:32 general protection fault in perf_misc_flags syzbot
2020-09-19 11:08 ` Borislav Petkov
2020-09-21  5:54   ` Dmitry Vyukov
2020-09-21  8:08     ` Dmitry Vyukov
2020-09-21 20:59       ` Nick Desaulniers
2020-09-21 22:13         ` Borislav Petkov
2020-09-22 18:56           ` Nick Desaulniers
2020-09-22 19:29             ` Borislav Petkov
2020-09-23  9:03             ` Borislav Petkov
2020-09-23  9:24               ` Dmitry Vyukov
2020-09-23 10:34                 ` Borislav Petkov
2020-09-23 15:20                   ` Dmitry Vyukov
2020-09-25 12:22                     ` Dmitry Vyukov
2020-09-26  0:32                       ` Nick Desaulniers
2020-09-26  6:46                         ` Dmitry Vyukov
2020-09-26 17:14                         ` Borislav Petkov
2020-09-26 11:21                     ` Borislav Petkov
2020-09-26 12:08                       ` Dmitry Vyukov
2020-09-22  5:15         ` Dmitry Vyukov
2020-09-22  5:16         ` Dmitry Vyukov
2020-09-27 14:57 ` Borislav Petkov
2020-09-28  5:18   ` Dmitry Vyukov
2020-09-28  6:06     ` Dmitry Vyukov
2020-09-28  8:38       ` Borislav Petkov
2020-09-28  8:40         ` Dmitry Vyukov
2020-09-28  8:54           ` Borislav Petkov
2020-09-28 10:33             ` Dmitry Vyukov [this message]
2020-09-28 20:23               ` Borislav Petkov
2020-09-29  8:33                 ` Borislav Petkov
2020-09-29 13:29                   ` Dmitry Vyukov
2020-09-30 16:17                     ` Borislav Petkov
2020-09-30 16:23                       ` Dmitry Vyukov
2020-09-30 16:29                         ` Dmitry Vyukov
2020-09-30 16:31                         ` Borislav Petkov
2020-10-01 10:23                           ` Dmitry Vyukov
2020-10-01 11:05                             ` Borislav Petkov
2020-09-28 20:51               ` Nick Desaulniers
2020-09-28 21:19                 ` Andy Lutomirski
2020-09-28  7:25     ` Marco Elver
2020-09-28 20:32     ` Nick Desaulniers
2020-09-29 13:27       ` Dmitry Vyukov

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