[PATCH] builddeb: Support signing kernels with a Machine Owner Key

From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-efi@vger.kernel.org, debian-efi@lists.debian.org,
	debian-kernel@lists.debian.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
	efi@lists.einval.com, mjg59@srcf.ucam.org, masahiroy@kernel.org,
	michal.lkml@markovi.net, linux-kbuild@vger.kernel.org
Subject: [PATCH] builddeb: Support signing kernels with a Machine Owner Key
Date: Thu,  6 May 2021 12:58:12 +0100	[thread overview]
Message-ID: <20210506115813.397657-1-willy@infradead.org> (raw)

If the config file specifies a signing key, use it to sign
the kernel so that machines with SecureBoot enabled can boot.
See https://wiki.debian.org/SecureBoot

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 scripts/package/builddeb | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index 91a502bb97e8..4fa6ff2b5cac 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -147,7 +147,15 @@ else
 	cp System.map "$tmpdir/boot/System.map-$version"
 	cp $KCONFIG_CONFIG "$tmpdir/boot/config-$version"
 fi
-cp "$($MAKE -s -f $srctree/Makefile image_name)" "$tmpdir/$installed_image_path"
+
+vmlinux=$($MAKE -s -f $srctree/Makefile image_name)
+if is_enabled CONFIG_MODULE_SIG; then
+	cert=$srctree/$(grep ^CONFIG_MODULE_SIG_KEY= include/config/auto.conf | cut -d\" -f2)
+	key=${cert%pem}priv
+	sbsign --key $key --cert $cert "$vmlinux" --output "$tmpdir/$installed_image_path"
+else
+	cp "$vmlinux" "$tmpdir/$installed_image_path"
+fi
 
 if is_enabled CONFIG_OF_EARLY_FLATTREE; then
 	# Only some architectures with OF support have this target
-- 
2.30.2

