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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id a92si667102pla.256.2019.05.08.18.05.10 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 08 May 2019 18:05:10 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of rdunlap@infradead.org designates 2607:7c80:54:e::133 as permitted sender) client-ip=2607:7c80:54:e::133; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=b4bKpqtl; spf=pass (google.com: best guess record for domain of rdunlap@infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=rdunlap@infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: Content-Type:In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To: Subject:Sender:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=G13SwZrvXQwLwqfSvC5cLaD8FJjp+bG9vvkSPGdxrhE=; b=b4bKpqtlBzzAQmT4dULJ60Wx/ 4+mV8vaQI2ye68XjE42FuRpIw2V+NKJMAqALzmF4L45TsWnm64cyf9aZYpA8l8d1NVLuDS8uIeCMm 2B7tvT+bSk4czrUY6K7SQEb6YcRxEbbkhhUCmU6VEmkdwCO+ZFvwQ/ZUJqgP/w4jZo4iHlN3eaVL+ kK/r7hTkrByF/ZaNFivjTPBINatmyiTOXJz51A7fd2jgcAqqDsyZ7d8uJeCUAQmLsnA5elniY+wKR sRgfHraFrxNNMgi36b/ZcrHq1Zw1KU7TahBjwB+7xbQIFWjjkzqDqw82hUi657MF+rES6DBkqzcCu rbCtLeMpQ==; Received: from static-50-53-52-16.bvtn.or.frontiernet.net ([50.53.52.16] helo=midway.dunlab) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1hOXUW-0003Al-Pt; Thu, 09 May 2019 01:04:56 +0000 Subject: Re: [PATCH 1/4] mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options To: Alexander Potapenko , akpm@linux-foundation.org, cl@linux.com, keescook@chromium.org, labbott@redhat.com Cc: linux-mm@kvack.org, linux-security-module@vger.kernel.org, kernel-hardening@lists.openwall.com, yamada.masahiro@socionext.com, jmorris@namei.org, serge@hallyn.com, ndesaulniers@google.com, kcc@google.com, dvyukov@google.com, sspatil@android.com, jannh@google.com, mark.rutland@arm.com References: <20190508153736.256401-1-glider@google.com> <20190508153736.256401-2-glider@google.com> From: Randy Dunlap Message-ID: <6e5ccf92-cc58-ab2b-d025-0f5642d5f4a6@infradead.org> Date: Wed, 8 May 2019 18:04:55 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190508153736.256401-2-glider@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 5/8/19 8:37 AM, Alexander Potapenko wrote: > diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening > index 0a1d4ca314f4..4a4001f5ad25 100644 > --- a/security/Kconfig.hardening > +++ b/security/Kconfig.hardening > @@ -159,6 +159,22 @@ config STACKLEAK_RUNTIME_DISABLE > runtime to control kernel stack erasing for kernels built with > CONFIG_GCC_PLUGIN_STACKLEAK. > > +config INIT_ON_ALLOC_DEFAULT_ON > + bool "Set init_on_alloc=1 by default" > + default false That should be spelled "default n" but since that is already the default, just omit the line completely. > + help > + Enable init_on_alloc=1 by default, making the kernel initialize every > + page and heap allocation with zeroes. > + init_on_alloc can be overridden via command line. > + > +config INIT_ON_FREE_DEFAULT_ON > + bool "Set init_on_free=1 by default" > + default false ditto. > + help > + Enable init_on_free=1 by default, making the kernel initialize freed > + pages and slab memory with zeroes. > + init_on_free can be overridden via command line. > + > endmenu > > endmenu -- ~Randy