grub2/0243-Skip-leading-spaces-on-BLS-field-values.patch

From a5bf618156915e97a0e7df07556ab728377de77e Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Thu, 7 Jun 2018 00:44:51 +0200
Subject: [PATCH] Skip leading spaces on BLS field values

The GRUB 2 blscfg command doesn't parse correctly the BLS fields if these
have extra spaces before the field values. For example, the following BLS
fragment generates a wrong menu entry due using spaces to tabulate values:

title      Fedora 28 (Twenty Eight)
version    4.16.13-300.fc28.x86_64
machine-id e5c131dfee3249cbb9891c2641d8e350
linux      /vmlinuz-4.16.13-300.fc28.x86_64
initrd     /initramfs-4.16.13-300.fc28.x86_64.img
options    root=/dev/mapper/fedora-root ro

Wrong generated menu entry:

load_video
set gfx_payload=keep
insmod gzio
linux  ($root)    /vmlinuz-4.16.13-300.fc28.x86_64    root=/dev/mapper/fedora-root ro
initrd ($root)    /initramfs-4.16.13-300.fc28.x86_64.img

Correct menu entry after the fix:

load_video
set gfx_payload=keep
insmod gzio
linux ($root)/vmlinuz-4.16.13-300.fc28.x86_64 root=/dev/mapper/fedora-root ro
initrd ($root)/initramfs-4.16.13-300.fc28.x86_64.img

Resolves: rhbz#1588184

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
 grub-core/commands/blscfg.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/grub-core/commands/blscfg.c b/grub-core/commands/blscfg.c
index 111972d5f67..cd5c29fdf74 100644
--- a/grub-core/commands/blscfg.c
+++ b/grub-core/commands/blscfg.c
@@ -448,7 +448,11 @@ static int read_entry (
 
       separator[0] = '\0';
 
-      rc = bls_add_keyval (entry, buf, separator+1);
+      do {
+	separator++;
+      } while (*separator == ' ' || *separator == '\t');
+
+      rc = bls_add_keyval (entry, buf, separator);
       grub_free (buf);
       if (rc < 0)
 	break;