Date: Thu, 7 Apr 2016 02:05:43 +0200 From: Ingo Molnar <mingo@...nel.org> To: Kees Cook <keescook@...omium.org> Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Matt Redfearn <matt.redfearn@...tec.com>, Yves-Alexis Perez <corsac@...ian.org>, Emrah Demir <ed@...sec.com>, Jonathan Corbet <corbet@....net>, "x86@...nel.org" <x86@...nel.org>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>, Borislav Petkov <bp@...e.de>, Andy Lutomirski <luto@...nel.org>, "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com> Subject: Re: [PATCH] Prefer kASLR over Hibernation * Kees Cook <keescook@...omium.org> wrote: > >> I don't think this is a good idea, as it turns off emergency hibernation of > >> laptops - many desktop distros support it by default. > > > > Right, I forgot about this one. > > When I last checked Ubuntu doesn't enable hibernation by default any more: > https://help.ubuntu.com/16.04/ubuntu-help/power-hibernate.html > > And it seems like Fedora either doesn't either, or has a lot of people > for whom it doesn't work: > https://bugzilla.redhat.com/show_bug.cgi?id=1206936 > https://bugzilla.redhat.com/show_bug.cgi?id=1224151 > http://blog.kriptonium.com/2015/12/fedora-23-hibernate.html Ok, that's a relatively recent development, I distinctly remember my laptop being hibernated in such a fashion fairly recently. That makes it easier to hack around the kASLR incompatibility by making hibernation less useful. Personally I think that conceptually user space persistency (CRIU et al) is superior to kernel level hibernation - but user-space save/restore is nowhere near as complete as kernel hibernation, so it's still somewhat sad that it doesn't work ... Thanks, Ingo
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