| 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 SΓΈrensen <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 |
| |