blob: 93fdd2cb1a87f7f4fe83718dc187cb0487b37820 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
From bfb9c44298aa202c176fef8dc5ea48f9b0e76e5e 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>
Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=d90367471779c240e002e62edfb6b31fc85b4908]
CVE: CVE-2020-14372
Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.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 d778bfb..5e6cace 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -5802,6 +5802,9 @@ 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
|
