Received: by 2002:ad5:4acb:0:0:0:0:0 with SMTP id n11csp3664850imw; Mon, 18 Jul 2022 12:13:41 -0700 (PDT) X-Google-Smtp-Source: AGRyM1t3WivAQOHesu9whachcZ6oC6QJU2T1yUqVY4bit+8CvqOPOoS4YwNu+9AdVgoIN88WINGp X-Received: by 2002:a63:5123:0:b0:419:9286:4be8 with SMTP id f35-20020a635123000000b0041992864be8mr25157107pgb.237.1658171621015; Mon, 18 Jul 2022 12:13:41 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1658171621; cv=none; d=google.com; s=arc-20160816; b=byDgmiVYS451wHFYMKKln7sO3hlkIJuSRlyOxCUGzjuE3TL4cN9U+uc5ATXZZ9TvTX CB9sF2MiPrKLO3HdQqdS/fChPlZoiGrcFs881kF+t0ADmJCXI39sw73cgKqIGTtmGjxv eb2miNMXsaYDZNkeP6QayDkQk4eADeStm8KY/zbjUORUDVchphUfN6bftKbDWA4MbSqM iijpt01b4nD/ptq+rJwUU4qrmJqg623XdzqGn4n1qm9uzHyK8dtcBLgpyar8niyF/vde /2WXOZQzIBgGDbiczxL/PgDPzL1aRHPR9FW4jHDpfByUe3/b+k9ehW+esi7lRqzTitry Nfgg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:subject:message-id:date:from:in-reply-to :references:mime-version:dkim-signature; bh=wvDVeCPZSKsQ1iYeMyLd3oWMSh1qMXx1KJqR09/AQsE=; b=BtLFvHLyJlQDfK6H/l9zd7UML06oEg1qLFQJdbNVKRO4rdJQQw7roOr+3O7umvwdbv xCNmLe/sDis067U6uTxiiZl5SsmVfC85+QO1+dVcyEQK6OSZtZ8rd99rjNr9yYk5l4s7 zwdXjKZFEoTmxg27wCSs2EnYXrpJ/Ax+qQQzm4ZCCF2wBErDNSZSdO6zv1v91swPeej1 rrpWhdDzVaHXGrJMp1Tc6IxwdQFkgFcob/0kguv7nJ5BUw85Vq6Hxuv0fcGEQAafRTYV pZZ/Skbq6jivNr3WmycJJtQZAL/NJYRYLiTZ3T50pScayrjg1jehAsa+jPFg/Vu6OMNE ivCw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linux-foundation.org header.s=google header.b=EwLXjpVQ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id q4-20020a17090311c400b0016a4ca6516asi2426217plh.406.2022.07.18.12.13.25; Mon, 18 Jul 2022 12:13:41 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linux-foundation.org header.s=google header.b=EwLXjpVQ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236007AbiGRSfM (ORCPT + 99 others); Mon, 18 Jul 2022 14:35:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235881AbiGRSfK (ORCPT ); Mon, 18 Jul 2022 14:35:10 -0400 Received: from mail-ej1-x631.google.com (mail-ej1-x631.google.com [IPv6:2a00:1450:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 83EE8248EA for ; Mon, 18 Jul 2022 11:35:09 -0700 (PDT) Received: by mail-ej1-x631.google.com with SMTP id fy29so21759989ejc.12 for ; Mon, 18 Jul 2022 11:35:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=wvDVeCPZSKsQ1iYeMyLd3oWMSh1qMXx1KJqR09/AQsE=; b=EwLXjpVQO3GPGwx9EHiWHXuUFvxgk+FZuiceO6VnMKQHAqh1pVyaaXS4ceyIIeSpcH L/hqkZztVlSz/vxaWsGsgm4BkBiPOafZx9hF/It8EUx+FH4+Xs+F8Anfhp9JVMcin2/v oOUJ5W/BUU2E0ppmAklPxWL1CFcOprHfrOyRc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=wvDVeCPZSKsQ1iYeMyLd3oWMSh1qMXx1KJqR09/AQsE=; b=kAspc8uhCclAgPVQ2EmX/kTWtwYodYqVGKQnU4FyJsh275VkuQx+vrelXZjChUoQIa VszBfMapl0WtF0kJIre4niAHhO5tRP+xUwImEP7XrASgEXv+NkeDw8Ro7L5hjkvgCqvP 4EKJPegLOsLROVyq3dvg0TMRdH+Tnwr803tYhdc3cWnpunk57m42iSnAseKvOEOSAEac HmQTYqsilCdFa8au+nW/n3eyEgwyvixB747ff90qII3WO1d9NjBxJke3oH03x0EODHBU gngKow3sb511fXkh3369b+Q0sYqBSAskvm9KUwQFV7S8KHheNPsK0PICSGVKhidm3TS/ wihA== X-Gm-Message-State: AJIora/lsNYOLEUAhZ7zT2yig8/zxn75M2tW70lSWeoMxGvRaVTyQARl MA4fYtUfKZhTlhpdb4pS+UhXOI5WosNazlRP X-Received: by 2002:a17:907:9803:b0:72e:ec55:b2a5 with SMTP id ji3-20020a170907980300b0072eec55b2a5mr17548990ejc.347.1658169307934; Mon, 18 Jul 2022 11:35:07 -0700 (PDT) Received: from mail-wr1-f45.google.com (mail-wr1-f45.google.com. [209.85.221.45]) by smtp.gmail.com with ESMTPSA id r24-20020aa7da18000000b0043ad162b5e3sm9021249eds.18.2022.07.18.11.35.07 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 Jul 2022 11:35:07 -0700 (PDT) Received: by mail-wr1-f45.google.com with SMTP id e15so13074252wro.5 for ; Mon, 18 Jul 2022 11:35:07 -0700 (PDT) X-Received: by 2002:a5d:69c2:0:b0:21d:807c:a892 with SMTP id s2-20020a5d69c2000000b0021d807ca892mr23821149wrw.274.1658169306930; Mon, 18 Jul 2022 11:35:06 -0700 (PDT) MIME-Version: 1.0 References: <87cze3docs.fsf@mpe.ellerman.id.au> <20220718134418.354114-1-mpe@ellerman.id.au> In-Reply-To: <20220718134418.354114-1-mpe@ellerman.id.au> From: Linus Torvalds Date: Mon, 18 Jul 2022 11:34:50 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] powerpc/64s: Disable stack variable initialisation for prom_init To: Michael Ellerman Cc: linuxppc-dev , Sudip Mukherjee , Kees Cook , Linux Kernel Mailing List , linux-hardening@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-1.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jul 18, 2022 at 6:44 AM Michael Ellerman wrote: > > With GCC 12, allmodconfig enables CONFIG_INIT_STACK_ALL_PATTERN, which > causes the compiler to emit memset calls to initialise on-stack > variables with a pattern. Ahh, and that explains why "volatile" made no difference. That did seem very odd. Thanks for figuring it out, Linus