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From:   "Lee, Chun-Yi" <joeyli.kernel@gmail.com>
To:     David Howells <dhowells@redhat.com>
Cc:     Herbert Xu <herbert@gondor.apana.org.au>,
        "David S . Miller" <davem@davemloft.net>,
        Ben Boeckel <me@benboeckel.net>,
        Randy Dunlap <rdunlap@infradead.org>,
        Malte Gell <malte.gell@gmx.de>,
        Varad Gautam <varad.gautam@suse.com>,
        Jarkko Sakkinen <jarkko@kernel.org>,
        Mimi Zohar <zohar@linux.ibm.com>, keyrings@vger.kernel.org,
        linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
        "Lee, Chun-Yi" <jlee@suse.com>
Subject: [PATCH v9,4/4] Documentation/admin-guide/module-signing.rst: add openssl command option example for CodeSign EKU
Date:   Wed, 13 Jul 2022 12:24:21 +0800
Message-Id: <20220713042421.21680-5-jlee@suse.com>
In-Reply-To: <20220713042421.21680-1-jlee@suse.com>
References: <20220713042421.21680-1-jlee@suse.com>
Precedence: bulk

Add an openssl command option example for generating CodeSign extended
key usage in X.509 when CONFIG_CHECK_CODESIGN_EKU is enabled.

Signed-off-by: "Lee, Chun-Yi" <jlee@suse.com>
---
 Documentation/admin-guide/module-signing.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/admin-guide/module-signing.rst b/Documentation/admin-guide/module-signing.rst
index 7d7c7c8a545c..ca3b8f19466c 100644
--- a/Documentation/admin-guide/module-signing.rst
+++ b/Documentation/admin-guide/module-signing.rst
@@ -170,6 +170,12 @@ generate the public/private key files::
 	   -config x509.genkey -outform PEM -out kernel_key.pem \
 	   -keyout kernel_key.pem
 
+When ``CONFIG_CHECK_CODESIGN_EKU`` option is enabled, the following openssl
+command option should be added where for generating CodeSign extended key usage
+in X.509::
+
+        -addext "extendedKeyUsage=codeSigning"
+
 The full pathname for the resulting kernel_key.pem file can then be specified
 in the ``CONFIG_MODULE_SIG_KEY`` option, and the certificate and key therein will
 be used instead of an autogenerated keypair.
-- 
2.26.2