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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Javier Martinez Canillas <javierm@redhat.com>
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Date: Tue, 2 Feb 2021 19:59:48 +0100
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Subject: [PATCH] kern/lockdown: Set a variable if the GRUB is locked down
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It may be useful for scripts to determine whether the GRUB is locked
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down or not. Add the lockdown variable which is set to "y" when the GRUB
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is locked down.
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Suggested-by: Dimitri John Ledkov <xnox@ubuntu.com>
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Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/kern/lockdown.c | 4 ++++
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docs/grub.texi | 3 +++
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2 files changed, 7 insertions(+)
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diff --git a/grub-core/kern/lockdown.c b/grub-core/kern/lockdown.c
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index f87ddaeb1ee..30cba7f5ea2 100644
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--- a/grub-core/kern/lockdown.c
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+++ b/grub-core/kern/lockdown.c
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@@ -18,6 +18,7 @@
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*/
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#include <grub/dl.h>
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+#include <grub/env.h>
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#include <grub/file.h>
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#include <grub/lockdown.h>
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@@ -84,6 +85,9 @@ grub_lockdown (void)
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#if 0
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grub_verifier_register (&lockdown_verifier);
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#endif
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+
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+ grub_env_set ("lockdown", "y");
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+ grub_env_export ("lockdown");
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}
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int
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diff --git a/docs/grub.texi b/docs/grub.texi
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index cb52684367f..6f331422bd3 100644
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--- a/docs/grub.texi
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+++ b/docs/grub.texi
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@@ -5635,6 +5635,9 @@ The GRUB can be locked down when booted on a secure boot environment, for exampl
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if the UEFI secure boot is enabled. On a locked down configuration, the GRUB will
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be restricted and some operations/commands cannot be executed.
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+The @samp{lockdown} variable is set to @samp{y} when the GRUB is locked down.
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+Otherwise it does not exit.
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+
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@node Platform limitations
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@chapter Platform limitations
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