linux-kernel - Re: [kernel-hardening] Re: [PATCH] KERNEL: resource: Fix bug on leakage in /proc/iomem file

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Message-ID: <1459968792.2818.22.camel@debian.org>
Date:	Wed, 06 Apr 2016 20:53:12 +0200
From:	Yves-Alexis Perez <corsac@...ian.org>
To:	kernel-hardening@...ts.openwall.com,
	Kees Cook <keescook@...omium.org>
Cc:	Emrah Demir <ed@...sec.com>,
	Dan Rosenberg <dan.j.rosenberg@...il.com>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [kernel-hardening] Re: [PATCH] KERNEL: resource: Fix bug on
 leakage in /proc/iomem file

On mer., 2016-04-06 at 11:43 -0700, Linus Torvalds wrote:
> Hibernation is really quite nasty when you have to have a fairly big
> special partition for it, and shrink your memory down. Writing things
> to disk was a whole lot more reasonable back in the days when laptops
> had 16MB of memory.

Actually you just have to have a swap partition, which people still set as
more or less the ram size, I think, so all in all it works (especially if
people hibernate without the ram completely used).
> 
> I really wonder how many people use it with a modern laptop and
> distro. I doubt it's much faster than just rebooting the whole system
> anyway, and there are lots of downsides.

I quite never hibernate on my laptop (it wouldn't work anyway since I boot wit
kaslr and have PAX_SANITIZE), but I use hibernation on desktops where suspend
to ram doesn't work because of radeon or nvidia graphic card (actually suspend
usually works, resume doesn't). If/when suspend to ram works fine, I think
hibernation is mostly useless.

Regards,
-- 
Yves-Alexis


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