runtime: Add boot option to blacklist some kernel modules

Signed-off-by: Alexey Gladkov <[email protected]>

Author: legionus

Documentation/BootParameters.md

@@ -13,6 +13,8 @@ The following parameters can be passed via kernel command line.
 - `debug` shows more messages.
 - `quiet` tries to be more quiet.
 - `rd-preload-modules` enables/disables loading a static list of modules before udev service.
+- `rd.driver.blacklist=<comma-separated list>` specifies the list of kernel
+  module names that should be added to blacklist before loading any kernel modules.
 
 Parameters responsible for mounting the root file system:
 

features/runtime/data/etc/initrd/cmdline.d/base

@@ -22,3 +22,4 @@ register_parameter string ROOT
 register_parameter string ROOTFLAGS
 register_parameter string ROOTFSTYPE
 register_parameter string STOP
+register_array string RD_DRIVER_BLACKLIST

features/runtime/data/etc/rc.d/init.d/modules

@@ -18,6 +18,22 @@
 [ -z "${RD_DEPMOD-}" ] ||
 	depmod -a
 
+if [ "${RD_DRIVER_BLACKLIST:-0}" != 0 ]; then
+	i=0
+	while [ $i -lt ${RD_DRIVER_BLACKLIST:-0} ]; do
+		eval "MODS=\"\$RD_DRIVER_BLACKLIST$i\""
+
+		modnames=()
+		readarray -t -d, modnames <<<"$MODS,"
+
+		for modname in "${modnames[@]}"; do
+			[ -n "$modname" ] && [ "$modname" != $'\n' ] ||
+				continue
+			printf 'blacklist %s\n' "$modname"
+		done >> /etc/modprobe.d/initramfs-blacklist.conf
+	done
+fi
+
 [ -n "${RD_PRELOAD_MODULES-}" ] ||
 	exit 0