linux-kernel - Re: Patch "i386: Relocatable kernel support" causes instant reboot

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Message-ID: <m1d56blfqi.fsf@ebiederm.dsl.xmission.com>
Date:	Fri, 22 Dec 2006 15:37:09 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Vivek Goyal <vgoyal@...ibm.com>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	Andi Kleen <ak@...e.de>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Patch "i386: Relocatable kernel support" causes instant reboot

Jean Delvare <khali@...ux-fr.org> writes:

> Hi Vivek,
>
> On Fri, 22 Dec 2006 16:10:56 +0530, Vivek Goyal wrote:
>> Another odd thing is that "file vmlinux.bin" shows following.
>> 
>> vmlinux.bin: Sendmail frozen configuration - version
> \015\024\322\216\356\222X\2306\032H\220\303\270\006\007\003
>> 
>> I am not sure what does it mean. I had expected it to be a data blob.
>> 
>> "vmlinux.bin: data"
>
> The file command uses heuristics to attempt to identify files. Here a
> random sequence of bytes was simply misinterpreted as something
> completely different. You can tell from the version string which is
> totally broken. So, "file" could be improved to avoid this false
> positive, but that's about it.
>
> Now, what's still relevant is that my vmlinux.bin starts with a
> binary sequence which differs from all other vmlinux.bin files around.
> So it's a hint that it is corrupted, although a deeper analysis will be
> required to figure out how and why.

A simple analysis says vmlinux.bin is created by the linker.  So we
can probably look at why vmlinux.bin gets generated strangely.

I know I touched that path a little bit in my patch.

Eric

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