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Wed, 8 Sep 2021 17:09:55 +0000 Content-Type: text/plain; charset=utf-8 Subject: Re: [PATCH v5 00/12] Enroll kernel keys thru MOK From: Eric Snowberg In-Reply-To: <7f9fb65a4ee20c337646a1fc887cd24365c2c59e.camel@kernel.org> Date: Wed, 8 Sep 2021 11:09:44 -0600 Cc: keyrings@vger.kernel.org, linux-integrity , Mimi Zohar , David Howells , David Woodhouse , Herbert Xu , "David S . Miller" , James Morris , "Serge E . Hallyn" , keescook@chromium.org, gregkh@linuxfoundation.org, torvalds@linux-foundation.org, scott.branden@broadcom.com, weiyongjun1@huawei.com, nayna@linux.ibm.com, ebiggers@google.com, ardb@kernel.org, nramas@linux.microsoft.com, lszubowi@redhat.com, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-security-module@vger.kernel.org, James.Bottomley@HansenPartnership.com, pjones@redhat.com, "konrad.wilk@oracle.com" Content-Transfer-Encoding: quoted-printable Message-Id: <17C81066-DBE8-4DB0-B66B-822BF6EFF67C@oracle.com> References: <20210907160110.2699645-1-eric.snowberg@oracle.com> <7f9fb65a4ee20c337646a1fc887cd24365c2c59e.camel@kernel.org> To: Jarkko Sakkinen X-Mailer: Apple Mail (2.3273) X-ClientProxiedBy: BY3PR03CA0023.namprd03.prod.outlook.com (2603:10b6:a03:39a::28) To CH2PR10MB4150.namprd10.prod.outlook.com (2603:10b6:610:ac::13) MIME-Version: 1.0 Received: from [IPv6:2606:b400:2001:93:8000::53] (2606:b400:8024:1010::17c6) by BY3PR03CA0023.namprd03.prod.outlook.com (2603:10b6:a03:39a::28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4500.14 via Frontend Transport; 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The UEFI shim provides >> what is called Machine Owner Keys (MOK). Shim uses both the UEFI Secure >> Boot DB and MOK keys to validate the next step in the boot chain. The >> MOK facility can be used to import user generated keys. These keys can >> be used to sign an end-user development kernel build. When Linux boots, >> pre-boot keys (both UEFI Secure Boot DB and MOK keys) get loaded in the >> Linux .platform keyring. =20 >>=20 >> Currently, pre-boot keys are not trusted within the Linux trust boundary >> [1]. These platform keys can only be used for kexec. If an end-user >=20 > What exactly is "trust boundary"? And what do you mean when you say that > Linux "trusts" something? AFAIK, software does not have feelings. Please, > just speak about exact things. I am using terminology used previously by others when addressing this issue= . =20 If I should be using different terminology, please advise. The kernel does = not=20 trust pre-boot keys within it, meaning these pre-boot keys can not be used = to=20 validate items within the kernel. This is the =E2=80=9Ctrust boundary=E2=80= =9D. Preboot keys are on one side of the boundary, compiled-in keys are on the other. MOK keys a= re=20 pre-boot keys. Currently they can not be used to validate things within th= e=20 kernel itself (kernel modules, IMA keys, etc).