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Re: GRUB and the risk of block list corruption in extX

From: Vladimir 'φ-coder/phcoder' Serbinenko
Subject: Re: GRUB and the risk of block list corruption in extX
Date: Tue, 19 Feb 2013 16:48:18 +0100
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On 19.02.2013 13:58, Martin Wilck wrote:

> Vladimir,
> thanks for your thoughtful answer. I understand your concerns better now.
> On 02/19/2013 10:37 AM, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>> Suppose blocklist changes because of e.g. user mistake. Yet at the old
>> location there is still the old core.img. For the time being. So this
>> problem may go unnoticed for years yet if someone has the ability to
>> create new files on the disk in question, he creates ton of files with
>> copies of malicious sector, one of them will overwrite core and be
>> executed on next reboot.
> Am I understanding correctly that the user mistake you describe must be
> some manipulation of "core.img" itself (e.g. running grub2-mkimage but
> now grub2-setup, which would classify as "mistake" in a blocklist setup)?

Yes. Such kind of mistakes. Or deleting GRUB and restoring it from backup.

> Martin

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