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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id 4sm3113116pgk.68.2020.07.29.12.13.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Jul 2020 12:13:13 -0700 (PDT) Date: Wed, 29 Jul 2020 12:13:12 -0700 From: Kees Cook To: Mimi Zohar Cc: Greg Kroah-Hartman , Scott Branden , Luis Chamberlain , Jessica Yu , SeongJae Park , KP Singh , linux-efi@vger.kernel.org, linux-security-module@vger.kernel.org, linux-integrity@vger.kernel.org, selinux@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 12/19] firmware_loader: Use security_post_load_data() Message-ID: <202007291205.CA09294424@keescook> References: <20200724213640.389191-1-keescook@chromium.org> <20200724213640.389191-13-keescook@chromium.org> <1595847465.4841.63.camel@kernel.org> <202007281242.B6016AE4B@keescook> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org On Wed, Jul 29, 2020 at 02:10:18PM -0400, Mimi Zohar wrote: > Actually, the partial firmware read should be calling > security_kernel_read_file(). Yup, it does[1], and when "whole_file" is true, it will call security_kernel_post_read_file() with the buffer contents at the end. > The sysfs firmware fallback is calling security_kernel_load_data(). Correct[2]; it has no file associated with it (same as the EFI platform source). > Which firmware is calling security_kernel_post_load_data()? sysfs and platform both call it[2], matched with their security_kernel_load_data() calls. -Kees [1] v4 patch 14: "fs/kernel_file_read: Add "offset" arg for partial reads" https://lore.kernel.org/lkml/20200729175845.1745471-1-keescook@chromium.org/T/#iZ2e.:..:20200729175845.1745471-15-keescook::40chromium.org:0fs:kernel_read_file.c [2] v4 patch 10: "firmware_loader: Use security_post_load_data()" https://lore.kernel.org/lkml/20200729175845.1745471-1-keescook@chromium.org/T/#iZ2e.:..:20200729175845.1745471-11-keescook::40chromium.org:0drivers:base:firmware_loader:fallback.c -- Kees Cook