From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D9A3C2D0A8 for ; Mon, 28 Sep 2020 08:54:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C8ED5208FE for ; Mon, 28 Sep 2020 08:54:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alien8.de header.i=@alien8.de header.b="gIB9MonS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726696AbgI1IyJ (ORCPT ); Mon, 28 Sep 2020 04:54:09 -0400 Received: from mail.skyhub.de ([5.9.137.197]:56208 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726440AbgI1IyJ (ORCPT ); Mon, 28 Sep 2020 04:54:09 -0400 Received: from zn.tnic (p200300ec2f072200afd3fa405d8d6d26.dip0.t-ipconnect.de [IPv6:2003:ec:2f07:2200:afd3:fa40:5d8d:6d26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 44B0E1EC00F4; Mon, 28 Sep 2020 10:54:08 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1601283248; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=gLGYiatJkGQ1A2AmIDjtk0yq6uM/smLtebj6KYuOT98=; b=gIB9MonSYfhbcE9Z33mCz+r5xcCPAQcqz27VsTzCfxXTxSuZ7+ZlyBn8/PjsvmUjn1oL3j xGvDsWFyBQCM+S9iia31spwP06WtYBHA4/++viyn+8pJWAo+geltItzXSzcNxiot0gY1dw AVXeZIlh3LyYaTd2pRB8lyQBjRFYbw8= Date: Mon, 28 Sep 2020 10:54:01 +0200 From: Borislav Petkov To: Dmitry Vyukov Cc: Alexander Potapenko , Marco Elver , syzbot , Arnaldo Carvalho de Melo , Alexander Shishkin , "H. Peter Anvin" , Jiri Olsa , LKML , Mark Rutland , Ingo Molnar , Namhyung Kim , Peter Zijlstra , syzkaller-bugs , Thomas Gleixner , the arch/x86 maintainers , clang-built-linux Subject: Re: general protection fault in perf_misc_flags Message-ID: <20200928085401.GE1685@zn.tnic> References: <00000000000052569205afa67426@google.com> <20200927145737.GA4746@zn.tnic> <20200928083819.GD1685@zn.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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... -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette