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Mon, 05 Oct 2020 08:19:04 -0400 X-MC-Unique: 8WN3W_jxMT-wrVxo4cDwSw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E77011018F60; Mon, 5 Oct 2020 12:19:02 +0000 (UTC) Received: from [10.36.114.222] (ovpn-114-222.ams2.redhat.com [10.36.114.222]) by smtp.corp.redhat.com (Postfix) with ESMTP id 75C57271A3; Mon, 5 Oct 2020 12:18:59 +0000 (UTC) Subject: Re: [PATCH] mm: optionally disable brk() To: David Laight , Topi Miettinen , Michal Hocko Cc: "akpm@linux-foundation.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" References: <20201002171921.3053-1-toiwoton@gmail.com> <653873ef-2a57-37e0-1ac3-fba763652b35@redhat.com> <2a0f5ade-d770-c36e-50bc-ff0c8e9dacbf@gmail.com> <20201005061248.GN4555@dhcp22.suse.cz> <888e62e0-3979-207b-c516-ddfc6b9f3345@redhat.com> <4d325e3e-3139-eded-6781-435fb04fb915@gmail.com> <9dc586f4-38f0-7956-0ab6-bd7921491606@redhat.com> <5fb32353b1964299809fce0c7579a092@AcuMS.aculab.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <5fb32353b1964299809fce0c7579a092@AcuMS.aculab.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 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 05.10.20 13:21, David Laight wrote: > From: David Hildenbrand >> Sent: 05 October 2020 10:55 > ... >>> If hardening and compatibility are seen as tradeoffs, perhaps there >>> could be a top level config choice (CONFIG_HARDENING_TRADEOFF) for this. >>> It would have options >>> - "compatibility" (default) to gear questions for maximum compatibility, >>> deselecting any hardening options which reduce compatibility >>> - "hardening" to gear questions for maximum hardening, deselecting any >>> compatibility options which reduce hardening >>> - "none/manual": ask all questions like before >> >> I think the general direction is to avoid an exploding set of config >> options. So if there isn't a *real* demand, I guess gluing this to a >> single option ("CONFIG_SECURITY_HARDENING") might be good enough. > > Wouldn't that be better achieved by run-time clobbering > of the syscall vectors? You mean via something like a boot parameter? Possibly yes. -- Thanks, David / dhildenb