From: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Fri, 30 Apr 2021 12:54:45 +0000 (-0400)
Subject: builddeb: Support signing kernels with a Machine Owner Key
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=faaf30ec6cf4c81425900c09e8bb59fb38435172;p=users%2Fwilly%2Flinux.git

builddeb: Support signing kernels with a Machine Owner Key

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>
---

diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index 91a502bb97e8a..4fa6ff2b5cac1 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