xref: /OK3568_Linux_fs/buildroot/boot/grub2/0036-kern-lockdown-Set-a-variable-if-the-GRUB-is-locked-d.patch (revision 4882a59341e53eb6f0b4789bf948001014eff981)

From d90367471779c240e002e62edfb6b31fc85b4908 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Tue, 2 Feb 2021 19:59:48 +0100
Subject: [PATCH] kern/lockdown: Set a variable if the GRUB is locked down

It may be useful for scripts to determine whether the GRUB is locked
down or not. Add the lockdown variable which is set to "y" when the GRUB
is locked down.

Suggested-by: Dimitri John Ledkov <xnox@ubuntu.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Stefan Sørensen <stefan.sorensen@spectralink.com>
---
 docs/grub.texi            | 3 +++
 grub-core/kern/lockdown.c | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/docs/grub.texi b/docs/grub.texi
index a25459f..bdbb329 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -5803,6 +5803,9 @@ The GRUB can be locked down when booted on a secure boot environment, for exampl
 if the UEFI secure boot is enabled. On a locked down configuration, the GRUB will
 be restricted and some operations/commands cannot be executed.

+The @samp{lockdown} variable is set to @samp{y} when the GRUB is locked down.
+Otherwise it does not exit.
+
 @node Platform limitations
 @chapter Platform limitations

diff --git a/grub-core/kern/lockdown.c b/grub-core/kern/lockdown.c
index 1e56c0b..0bc70fd 100644
--- a/grub-core/kern/lockdown.c
+++ b/grub-core/kern/lockdown.c
@@ -18,6 +18,7 @@
  */

 #include <grub/dl.h>
+#include <grub/env.h>
 #include <grub/file.h>
 #include <grub/lockdown.h>
 #include <grub/verify.h>
@@ -71,6 +72,9 @@ grub_lockdown (void)
   lockdown = GRUB_LOCKDOWN_ENABLED;

   grub_verifier_register (&lockdown_verifier);
+
+  grub_env_set ("lockdown", "y");
+  grub_env_export ("lockdown");
 }

 int
--
2.14.2