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[195.135.220.15]) by mx.google.com with ESMTPS id d33si678943edc.66.2019.04.16.01.36.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 16 Apr 2019 01:36:52 -0700 (PDT) Received-SPF: pass (google.com: domain of vbabka@suse.cz designates 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=pass (google.com: domain of vbabka@suse.cz designates 195.135.220.15 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 0A042ADAA; Tue, 16 Apr 2019 08:36:52 +0000 (UTC) Subject: Re: [PATCH] mm: security: introduce CONFIG_INIT_HEAP_ALL To: Andrew Morton , Alexander Potapenko Cc: linux-security-module@vger.kernel.org, linux-mm@kvack.org, ndesaulniers@google.com, kcc@google.com, dvyukov@google.com, keescook@chromium.org, sspatil@android.com, labbott@redhat.com, kernel-hardening@lists.openwall.com References: <20190412124501.132678-1-glider@google.com> <20190415190213.5831bbc17e5073690713b001@linux-foundation.org> From: Vlastimil Babka Openpgp: preference=signencrypt Autocrypt: addr=vbabka@suse.cz; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190415190213.5831bbc17e5073690713b001@linux-foundation.org> 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 4/16/19 4:02 AM, Andrew Morton wrote: > Requiring a kernel rebuild is rather user-hostile. A boot option > (early_param()) would be much more useful and I expect that the loss in > coverage would be small and acceptable? Could possibly use the > static_branch infrastructure. Agreed. There could be a config option to make it default on if no param given. Then a config option to (not) compile this in at all would be probably superfluous, although small systems/architectures without effective static keys might care.