3 files changed, 46 insertions, 3 deletions

diff --git a/src/security/lockdown/Kconfig b/src/security/lockdown/Kconfig
index bfdc984b45..30b5237ffc 100644
--- a/src/security/lockdown/Kconfig
+++ b/src/security/lockdown/Kconfig
@@ -59,4 +59,26 @@ config BOOTMEDIA_LOCK_WHOLE_NO_ACCESS
 	  you won't be able to write to the whole flash chip using the
 	  internal controller any more.
 
+config BOOTMEDIA_LOCK_WPRO_VBOOT_RO
+	bool "Write-protect WP_RO FMAP region in boot medium"
+	depends on VBOOT
+	help
+	  Select this if you want to write-protect the WP_RO region as specified
+	  in the VBOOT FMAP. You will be able to write every region outside
+	  of WP_RO using the internal controller (eg. FW_MAIN_A/FW_MAIN_B).
+	  In case of BOOTMEDIA_LOCK_IN_VERSTAGE the locking will take place
+	  early, preventing locking of facilities used in ramstage, like the
+	  MRC cache. If not using BOOTMEDIA_LOCK_IN_VERSTAGE the chipset lockdown
+	  is either triggered by coreboot (when INTEL_CHIPSET_LOCKDOWN is set) or
+	  has to be triggered later (e.g. by the payload or the OS).
+
 endchoice
+
+config BOOTMEDIA_LOCK_IN_VERSTAGE
+	depends on BOOTMEDIA_LOCK_WPRO_VBOOT_RO
+	bool "Lock boot media down in verstage"
+	help
+	  Select this if you want to write-protect the WP_RO region as soon as
+	  possible. This option prevents using write protecting facilities in
+	  ramstage, like the MRC cache for example.
+	  Use this option if you don't trust code running after verstage.
diff --git a/src/security/lockdown/Makefile.inc b/src/security/lockdown/Makefile.inc
index a51a106ebc..6ccc5571d4 100644
--- a/src/security/lockdown/Makefile.inc
+++ b/src/security/lockdown/Makefile.inc
@@ -2,5 +2,11 @@
 ## This file is part of the coreboot project.
 
 ifneq ($(CONFIG_BOOTMEDIA_LOCK_NONE),y)
+
+ifeq ($(CONFIG_BOOTMEDIA_LOCK_IN_VERSTAGE),y)
+verstage-y += lockdown.c
+else
 ramstage-y += lockdown.c
 endif
+
+endif
diff --git a/src/security/lockdown/lockdown.c b/src/security/lockdown/lockdown.c
index a8aad9b5eb..62d0a2914a 100644
--- a/src/security/lockdown/lockdown.c
+++ b/src/security/lockdown/lockdown.c
@@ -5,13 +5,15 @@
 #include <commonlib/region.h>
 #include <console/console.h>
 #include <bootstate.h>
+#include <fmap.h>
 
 /*
  * Enables read- /write protection of the bootmedia.
  */
 void boot_device_security_lockdown(void)
 {
-	const struct region_device *rdev;
+	const struct region_device *rdev = NULL;
+	struct region_device dev;
 	enum bootdev_prot_type lock_type;
 
 	printk(BIOS_DEBUG, "BM-LOCKDOWN: Enabling boot media protection scheme ");
@@ -23,19 +25,32 @@ void boot_device_security_lockdown(void)
 		} else if (CONFIG(BOOTMEDIA_LOCK_WHOLE_NO_ACCESS)) {
 			printk(BIOS_DEBUG, "'no access'");
 			lock_type = CTRLR_RWP;
+		} else if (CONFIG(BOOTMEDIA_LOCK_WPRO_VBOOT_RO)) {
+			printk(BIOS_DEBUG, "'WP_RO only'");
+			lock_type = CTRLR_WP;
 		}
 		printk(BIOS_DEBUG, "using CTRL...\n");
 	} else {
 		if (CONFIG(BOOTMEDIA_LOCK_WHOLE_RO)) {
 			printk(BIOS_DEBUG, "'readonly'");
 			lock_type = MEDIA_WP;
+		} else if (CONFIG(BOOTMEDIA_LOCK_WPRO_VBOOT_RO)) {
+			printk(BIOS_DEBUG, "'WP_RO only'");
+			lock_type = MEDIA_WP;
 		}
 		printk(BIOS_DEBUG, "using flash chip...\n");
 	}
 
-	rdev = boot_device_ro();
+	if (CONFIG(BOOTMEDIA_LOCK_WPRO_VBOOT_RO)) {
+		if (fmap_locate_area_as_rdev("WP_RO", &dev) < 0)
+			printk(BIOS_ERR, "BM-LOCKDOWN: Could not find region 'WP_RO'\n");
+		else
+			rdev = &dev;
+	} else {
+		rdev = boot_device_ro();
+	}
 
-	if (boot_device_wp_region(rdev, lock_type) >= 0)
+	if (rdev && boot_device_wp_region(rdev, lock_type) >= 0)
 		printk(BIOS_INFO, "BM-LOCKDOWN: Enabled bootmedia protection\n");
 	else
 		printk(BIOS_ERR, "BM-LOCKDOWN: Failed to enable bootmedia protection\n");