From 8e4aea82c6aba6b8b5ca68d74abafa3fe9486c36 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Thu, 19 Apr 2012 14:17:38 -0400
Subject: [PATCH] Open device O_WRONLY in grub_util_biosdisk_write.

revision 4225 introduced an error wherein the device we intend
to write to from e.g. grub2-bios-setup is opened read-only. The
immediate following write(2) call then fails with -EBADF.

---
 grub-core/kern/emu/hostdisk.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/grub-core/kern/emu/hostdisk.c b/grub-core/kern/emu/hostdisk.c
index ea7eb3d..19748df 100644
--- a/grub-core/kern/emu/hostdisk.c
+++ b/grub-core/kern/emu/hostdisk.c
@@ -1081,7 +1081,7 @@ grub_util_biosdisk_write (grub_disk_t disk, grub_disk_addr_t sector,
     {
       int fd;
       grub_disk_addr_t max = ~0ULL;
-      fd = open_device (disk, sector, O_RDONLY, &max);
+      fd = open_device (disk, sector, O_WRONLY, &max);
       if (fd < 0)
 	return grub_errno;
 
-- 
1.7.10