From 959db537b12c5e76c244ccc51cbbed7f27b0abe2 Mon Sep 17 00:00:00 2001 From: Javier Martinez Canillas Date: Tue, 2 Feb 2021 19:59:48 +0100 Subject: [PATCH 10/46] 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 Signed-off-by: Javier Martinez Canillas Reviewed-by: Daniel Kiper --- 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 a459a71e4..3a4d18e06 100644 --- a/docs/grub.texi +++ b/docs/grub.texi @@ -5820,6 +5820,9 @@ 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 1e56c0b80..0bc70fd42 100644 --- a/grub-core/kern/lockdown.c +++ b/grub-core/kern/lockdown.c @@ -18,6 +18,7 @@ */ #include +#include #include #include #include @@ -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 -- 2.26.2