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[PATCH] 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>
 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-$version"
-cp "$($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"
+	cp "$vmlinux" "$tmpdir/$installed_image_path"
 if is_enabled CONFIG_OF_EARLY_FLATTREE; then
 	# Only some architectures with OF support have this target

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