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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: Fri, 08 Feb 2013 18:17:57 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2

> This is not a complete answer but one of my problems is that such
> requests don't even suply any kind of reason to go into such installs.
> We nerd to consider usecases before even considering using an approach
> which is known for some pretty serious problems. Will answer in more
> details later.

In my case, the reason is a multiboot setup based on chainloading the
indiviual installed OS's bootloaders from a central, primary bootloader.
This is easily accomplished by installing the individual OS's
bootloaders in their respective "/" or "/boot" partitions. Linux
distributions have encouraged this kind of setup over several years -
"install boot loader in first sector of root/boot partition" used to be
a prominent option somewhere in the installation process (these
distributions were usually GRUB 0.9x based - GRUB 0.9x developers didn't
seem to have a big issue with stage1_5 being loaded via block lists).

Recent GRUB2-based distributions like Fedora have removed this option,
and some users are dissatisfied with that. I would like to understand
what the actual risk is. So I'd appreciate examples for the "pretty
serious problems" you mention.


Dr. Martin Wilck
PRIMERGY System Software Engineer
x86 Server Engineering

Fujitsu Technology Solutions GmbH
Heinz-Nixdorf-Ring 1
33106 Paderborn, Germany
Phone:                  ++49 5251 525 2796
Fax:                    ++49 5251 525 2820
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