grub2/0068-Use-device-part-of-chainloader-target-if-present.patch

From e30cb265bcb8597e0bcb21b21ffb9014599ece51 Mon Sep 17 00:00:00 2001
From: Raymund Will <rw@suse.com>
Date: Fri, 10 Apr 2015 01:45:02 -0400
Subject: [PATCH 68/88] Use device part of chainloader target, if present.

Otherwise chainloading is restricted to '$root', which might not even
be readable by EFI!

v1. use grub_file_get_device_name() to get device name

Signed-off-by: Michael Chang <mchang@suse.com>
Signed-off-by: Peter Jones <pjones@redhat.com>
---
 grub-core/loader/efi/chainloader.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/grub-core/loader/efi/chainloader.c b/grub-core/loader/efi/chainloader.c
index 522a716..6b47497 100644
--- a/grub-core/loader/efi/chainloader.c
+++ b/grub-core/loader/efi/chainloader.c
@@ -219,8 +219,11 @@ grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
   if (! file)
     goto fail;
 
-  /* Get the root device's device path.  */
-  dev = grub_device_open (0);
+  /* Get the device path from filename. */
+  char *devname = grub_file_get_device_name (filename);
+  dev = grub_device_open (devname);
+  if (devname)
+    grub_free (devname);
   if (! dev)
     goto fail;
 
-- 
2.5.5