linux-kernel - Re: [PATCH v2] x86, kaslr: propagate base load address calculation

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Message-ID: <CAGXu5jL7opSG92o5Gu2tT-NWTfiC7dNSMLynPZWb8uHzUoUqLg@mail.gmail.com>
Date:	Tue, 17 Feb 2015 08:45:53 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	live-patching@...r.kernel.org, Linux-MM <linux-mm@...ck.org>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v2] x86, kaslr: propagate base load address calculation

On Tue, Feb 17, 2015 at 4:39 AM, Borislav Petkov <bp@...en8.de> wrote:
> On Tue, Feb 17, 2015 at 01:21:20PM +0100, Jiri Kosina wrote:
>> I don't have strong feelings either way. It seems slightly nicer
>> to have a predictable oops output format no matter the CONFIG_
>> options and command-line contents, but if you feel like seeing the
>> 'Kernel offset: 0' in 'nokaslr' and !CONFIG_RANDOMIZE_BASE cases is
>> unnecessary noise, feel free to make this change to my patch.
>
> Well, wouldn't it be wrong to print this line if kaslr is disabled?
> Because of the ambiguity in that case: that line could mean either we
> randomized to 0 or kaslr is disabled but you can't know that from the
> "0" in there, right?

Maybe it should say:

Kernel offset: disabled

for maximum clarity?

-Kees

>
> --
> Regards/Gruss,
>     Boris.
>
> ECO tip #101: Trim your mails when you reply.
> --



-- 
Kees Cook
Chrome OS Security
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