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

From: Martin Wilck
Subject: Re: GRUB and the risk of block list corruption in extX
Date: Tue, 19 Feb 2013 13:58:03 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2


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)?


Dr. Martin Wilck
PRIMERGY System Software Engineer
x86 Server Engineering

Fujitsu Technology Solutions GmbH
Heinz-Nixdorf-Ring 1
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