34 lines
1.3 KiB
Diff
34 lines
1.3 KiB
Diff
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From b83ac74a8b87a770bdd78c7c23731bcc252393e4 Mon Sep 17 00:00:00 2001
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From: Phillip Susi <psusi@ubuntu.com>
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Date: Fri, 2 May 2014 21:50:50 -0400
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Subject: [PATCH 207/208] libparted: don't trash filesystem when writing loop
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label
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If you deleted the fake partition on a loop label, loop_write() would write
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the loop signature to the device, zeroing out all other bytes in the first
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sector. When the disk contained an ext[234] filesystem and was using 2k
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sectors, this would trash the super block residing in the 1-2kb part of the
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sector causing the disk to become unrecognized. Instead, read the existing
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sector and only modify the first few bytes that contain the loop label.
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---
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libparted/labels/loop.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/libparted/labels/loop.c b/libparted/labels/loop.c
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index 8ebb1f4..98f9f23 100644
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--- a/libparted/labels/loop.c
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+++ b/libparted/labels/loop.c
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@@ -170,7 +170,8 @@ loop_write (const PedDisk* disk)
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/* if there is already a filesystem on the disk, we don't need to write the signature */
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if (part && part->fs_type)
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return 1;
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- memset (buf, 0, buflen);
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+ if (!ped_device_read (disk->dev, buf, 0, 1))
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+ return 0;
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strcpy (buf, LOOP_SIGNATURE);
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return ped_device_write (disk->dev, buf, 0, 1);
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--
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1.9.0
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