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[bug #33229] Truecrypt System Volume Header gets overwritten
From: |
Patrick |
Subject: |
[bug #33229] Truecrypt System Volume Header gets overwritten |
Date: |
Wed, 04 May 2011 16:13:35 +0000 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:2.0) Gecko/20100101 Firefox/4.0 |
URL:
<http://savannah.gnu.org/bugs/?33229>
Summary: Truecrypt System Volume Header gets overwritten
Project: GNU GRUB
Submitted by: p55
Submitted on: Wed 04 May 2011 04:13:34 PM GMT
Category: Disk & Partition
Severity: Major
Priority: 5 - Normal
Item Group: Action Request
Status: None
Privacy: Public
Assigned to: None
Originator Name: Patrick55
Originator Email: address@hidden
Open/Closed: Open
Discussion Lock: Any
Release:
Release: other
Reproducibility: Every Time
Planned Release: None
_______________________________________________________
Details:
Truecrypt System Volume Header gets overwritten when you install grub on the
master boot record of a hard disk with windows 7 installed and truecrypt full
_system_ disk encryption set up.
With system disk encryption the truecrypt volume header for the "system
partition" - i.e. the one that holds C:windows - is written to the last (512
byte-) sector (62) of the "dos compatibility area" after the master boot
record of the disk holding the "system partition". (The small 100mb partition
in front of the system partition that windows creates as it's boot partition
and where files like "bootmgr" reside is not encryptet, the system partition
is usually the second of the four partitions defined in the mbr)
Reference: http://www.truecrypt.org/docs/encryption-scheme
-> point 2., 2nd sentence
I believe this would not really be necessary. The core.img produces by
grub-mkimage is usually smaller than 61 sectors. It just gets bloated by the
grub_reed_solomon_add_redundancy() function in grub-setup.c
My idea is to modify the pc_partition_map_embed() function to not include
sector 62 of the disk - at least not if the offset of the first partition is
more than 63 sectors (2048 typically) anyway.
I will try to come up with some patch to implement this functionality.
Suggestions, warnings & wishes are welcome.
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?33229>
_______________________________________________
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- [bug #33229] Truecrypt System Volume Header gets overwritten,
Patrick <=
- [bug #33229] Truecrypt System Volume Header gets overwritten, Patrick, 2011/05/04
- [bug #33229] Truecrypt System Volume Header gets overwritten, Vladimir Serbinenko, 2011/05/04
- [bug #33229] Truecrypt System Volume Header gets overwritten, Patrick, 2011/05/04
- [bug #33229] Truecrypt System Volume Header gets overwritten, Vladimir Serbinenko, 2011/05/04
- [bug #33229] Truecrypt System Volume Header gets overwritten, Patrick, 2011/05/04
- [bug #33229] Truecrypt System Volume Header gets overwritten, Patrick, 2011/05/04
- [bug #33229] Truecrypt System Volume Header gets overwritten, Patrick, 2011/05/04
- [bug #33229] Truecrypt System Volume Header gets overwritten, Patrick, 2011/05/04
- [bug #33229] Truecrypt System Volume Header gets overwritten, Patrick, 2011/05/04
- [bug #33229] Truecrypt System Volume Header gets overwritten, Vladimir Serbinenko, 2011/05/11