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Wed, 09 Apr 2025 08:47:54 -0700 (PDT) Received: from [192.168.0.20] ([212.21.133.214]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-acaa1ce7317sm114172666b.177.2025.04.09.08.47.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 09 Apr 2025 08:47:54 -0700 (PDT) Message-ID: <00b29ba9-e886-4464-be39-731789cef72b@suse.com> Date: Wed, 9 Apr 2025 18:47:52 +0300 Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] Allow individual features to be locked down To: Dan Williams , Paul Moore Cc: linux-security-module@vger.kernel.org, serge@hallyn.com, kees@kernel.org, linux-kernel@vger.kernel.org, kirill.shutemov@linux.intel.com, linux-coco@lists.linux.dev References: <20250321102422.640271-1-nik.borisov@suse.com> <67f69600ed221_71fe2946f@dwillia2-xfh.jf.intel.com.notmuch> From: Nikolay Borisov Content-Language: en-US In-Reply-To: <67f69600ed221_71fe2946f@dwillia2-xfh.jf.intel.com.notmuch> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 9.04.25 г. 18:45 ч., Dan Williams wrote: > Paul Moore wrote: >> On Fri, Mar 21, 2025 at 6:24 AM Nikolay Borisov wrote: >>> >>> This simple change allows usecases where someone might want to lock only specific >>> feature at a finer granularity than integrity/confidentiality levels allows. >>> The first likely user of this is the CoCo subsystem where certain features will be >>> disabled. >>> >>> Nikolay Borisov (2): >>> lockdown: Switch implementation to using bitmap >>> lockdown/kunit: Introduce kunit tests >> >> Hi Nikolay, >> >> Thanks for the patches! With the merge window opening in a few days, >> it is too late to consider this for the upcoming merge window so >> realistically this patchset is two weeks out and I'm hopeful we'll >> have a dedicated Lockdown maintainer by then so I'm going to defer the >> ultimate decision on acceptance to them. > > The patches in this thread proposed to selectively disable /dev/mem > independent of all the other lockdown mitigations. That goal can be > achieved with more precision with this proposed patch: > > http://lore.kernel.org/67f5b75c37143_71fe2949b@dwillia2-xfh.jf.intel.com.notmuch True, however I think increasing the granularity of the lockdown subsystem merits its own discussion, notwithstanding COCO use case.