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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id u13-20020a170902e80d00b00178ac4e70dcsm7787131plg.185.2022.10.03.17.00.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Oct 2022 17:00:23 -0700 (PDT) Date: Mon, 3 Oct 2022 17:00:23 -0700 From: Kees Cook To: Rick Edgecombe Cc: x86@kernel.org, "H . Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H . J . Lu" , Jann Horn , Jonathan Corbet , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V . Shankar" , Weijiang Yang , "Kirill A . Shutemov" , joao.moreira@intel.com, John Allen , kcc@google.com, eranian@google.com, rppt@kernel.org, jamorris@linux.microsoft.com, dethoma@microsoft.com, Mike Rapoport Subject: Re: [OPTIONAL/RFC v2 38/39] x86/cet/shstk: Add ARCH_CET_UNLOCK Message-ID: <202210031700.3C9BB219A@keescook> References: <20220929222936.14584-1-rick.p.edgecombe@intel.com> <20220929222936.14584-39-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220929222936.14584-39-rick.p.edgecombe@intel.com> ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1664841625; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=o2b6tkTm79Hq7cBFTASISNpumWfJdTPRV3REM28Za+c=; b=4MlYn8Ca6WHbBs6+tzDwI3ZD9nb46JDJkYXPYD9JrL2K8qbJonO3SAUwTX7VEikVqPylYq nm0Fc7gLF0KM1AlwlpsOzk8waxkge75V8urdbM+7rl4gfrVFC4VSvYdYtiX8/joQE327kE eYmqWmJVLuAQQiUNT3pFWd6ZvZg1Evw= ARC-Authentication-Results: i=1; imf18.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=RHkLlXam; spf=pass (imf18.hostedemail.com: domain of keescook@chromium.org designates 209.85.210.182 as permitted sender) smtp.mailfrom=keescook@chromium.org; dmarc=pass (policy=none) header.from=chromium.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1664841625; a=rsa-sha256; cv=none; b=duXeX6SQ004WEzFq+mT8UlR/a0P/mhwIVywm4g0/u3k+T5SP5ktMsbUABK8MoqcMIb5Phl /KK94URKbrctirKlGi4JYQ5dwdpgb8rBNuYyaysCO9HRi0mOrIbuFaQZq9wLEFQ1fpz5re tWgUt2goyJrBIe0KVnFLeQU7fO9ftcY= Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=RHkLlXam; spf=pass (imf18.hostedemail.com: domain of keescook@chromium.org designates 209.85.210.182 as permitted sender) smtp.mailfrom=keescook@chromium.org; dmarc=pass (policy=none) header.from=chromium.org X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 6D6961C0010 X-Rspam-User: X-Stat-Signature: 5ep35ufoyndn56pmmziifsyya3u4ssyu X-HE-Tag: 1664841625-374922 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 Thu, Sep 29, 2022 at 03:29:35PM -0700, Rick Edgecombe wrote: > From: Mike Rapoport > > Userspace loaders may lock features before a CRIU restore operation has > the chance to set them to whatever state is required by the process > being restored. Allow a way for CRIU to unlock features. Add it as an > arch_prctl() like the other CET operations, but restrict it being called > by the ptrace arch_pctl() interface. Hrm, please make this build-depend on CRIU... -- Kees Cook