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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <>
Date: Wed, 21 Nov 2018 15:38:50 +0100
Subject: [PATCH] blscfg: expand grub_users before passing to

The "grub_users" field from the BLS snippet file is used to specifcy the
users that are allowed to execute a given menu entry if the "superusers"
environment variable is set.

If the "grub_users" isn't set, the menu entry is unrestricted and it can
be executed without any authentication and if is set then only the users
defined in "grub_users" can execute the menu entry after authentication.

But this field can contain an environment variable so has to be expanded
or otherwise grub2 will wrongly assume that the user is "$var", and will
populate a menu entry that it's resctrited even when "$var" isn't set.

Resolves: rhbz#1650706

Signed-off-by: Javier Martinez Canillas <>
 grub-core/commands/blscfg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/grub-core/commands/blscfg.c b/grub-core/commands/blscfg.c
index 42892cbfd55..c432c6ba27a 100644
--- a/grub-core/commands/blscfg.c
+++ b/grub-core/commands/blscfg.c
@@ -704,7 +704,7 @@ static void create_entry (struct bls_entry *entry)
   initrds = bls_make_list (entry, "initrd", NULL);
   hotkey = bls_get_val (entry, "grub_hotkey", NULL);
-  users = bls_get_val (entry, "grub_users", NULL);
+  users = expand_val (bls_get_val (entry, "grub_users", NULL));
   classes = bls_make_list (entry, "grub_class", NULL);
   args = bls_make_list (entry, "grub_arg", &argc);