34 lines
1.3 KiB
Diff
34 lines
1.3 KiB
Diff
From 1be70093eb937f34388e06ce3731e5f56f217950 Mon Sep 17 00:00:00 2001
|
|
From: Phillip Susi <psusi@ubuntu.com>
|
|
Date: Fri, 2 May 2014 21:18:55 -0400
|
|
Subject: [PATCH 112/131] libparted: don't trash filesystem when writing loop
|
|
label
|
|
|
|
If you deleted the fake partition on a loop label, loop_write() would write
|
|
the loop signature to the device, zeroing out all other bytes in the first
|
|
sector. When the disk contained an ext[234] filesystem and was using 2k
|
|
sectors, this would trash the super block residing in the 1-2kb part of the
|
|
sector causing the disk to become unrecognized. Instead, read the existing
|
|
sector and only modify the first few bytes that contain the loop label.
|
|
---
|
|
libparted/labels/loop.c | 3 ++-
|
|
1 file changed, 2 insertions(+), 1 deletion(-)
|
|
|
|
diff --git a/libparted/labels/loop.c b/libparted/labels/loop.c
|
|
index 8ebb1f4..98f9f23 100644
|
|
--- a/libparted/labels/loop.c
|
|
+++ b/libparted/labels/loop.c
|
|
@@ -170,7 +170,8 @@ loop_write (const PedDisk* disk)
|
|
/* if there is already a filesystem on the disk, we don't need to write the signature */
|
|
if (part && part->fs_type)
|
|
return 1;
|
|
- memset (buf, 0, buflen);
|
|
+ if (!ped_device_read (disk->dev, buf, 0, 1))
|
|
+ return 0;
|
|
strcpy (buf, LOOP_SIGNATURE);
|
|
|
|
return ped_device_write (disk->dev, buf, 0, 1);
|
|
--
|
|
1.9.3
|
|
|