From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from namei.org ([65.99.196.166]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gWmlJ-0008LG-Q3 for kexec@lists.infradead.org; Tue, 11 Dec 2018 18:28:07 +0000 Date: Wed, 12 Dec 2018 05:27:44 +1100 (AEDT) From: James Morris Subject: Re: [PATCH v2 1/7] integrity: Define a trusted platform keyring In-Reply-To: <20181208202705.18673-2-nayna@linux.ibm.com> Message-ID: References: <20181208202705.18673-1-nayna@linux.ibm.com> <20181208202705.18673-2-nayna@linux.ibm.com> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Nayna Jain Cc: linux-efi@vger.kernel.org, mpe@ellerman.id.au, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, zohar@linux.ibm.com, dhowells@redhat.com, seth.forshee@canonical.com, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org, ebiederm@xmission.com, jforbes@redhat.com, linux-integrity@vger.kernel.org, vgoyal@redhat.com On Sun, 9 Dec 2018, Nayna Jain wrote: > On secure boot enabled systems, a verified kernel may need to kexec > additional kernels. For example, it may be used as a bootloader needing > to kexec a target kernel or it may need to kexec a crashdump kernel. In > such cases, it may want to verify the signature of the next kernel > image. > > It is further possible that the kernel image is signed with third party > keys which are stored as platform or firmware keys in the 'db' variable. > The kernel, however, can not directly verify these platform keys, and an > administrator may therefore not want to trust them for arbitrary usage. > In order to differentiate platform keys from other keys and provide the > necessary separation of trust, the kernel needs an additional keyring to > store platform keys. > > This patch creates the new keyring called ".platform" to isolate keys > provided by platform from keys by kernel. These keys are used to > facilitate signature verification during kexec. Since the scope of this > keyring is only the platform/firmware keys, it cannot be updated from > userspace. > > This keyring can be enabled by setting CONFIG_INTEGRITY_PLATFORM_KEYRING. > > Signed-off-by: Nayna Jain > Reviewed-by: Mimi Zohar > Acked-by: Serge Hallyn Reviewed-by: James Morris -- James Morris _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec