Date: Thu, 7 Apr 2016 00:04:59 +0200 From: "Rafael J. Wysocki" <rafael@...nel.org> To: Ingo Molnar <mingo@...nel.org> Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Kees Cook <keescook@...omium.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, "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 Subject: Re: [PATCH] Prefer kASLR over Hibernation On Wed, Apr 6, 2016 at 11:56 PM, Ingo Molnar <mingo@...nel.org> wrote: > > * Rafael J. Wysocki <rafael@...nel.org> wrote: > >> On Wed, Apr 6, 2016 at 9:44 PM, Kees Cook <keescook@...omium.org> wrote: >> > When building with both CONFIG_HIBERNATION and CONFIG_RANDOMIZE_BASE, >> > one or the other must be chosen at boot-time. Until now, hibernation >> > was selected when no choice was made on the command line. >> > >> > To make the security benefits of kASLR more widely available to end >> > users (since the use of hibernation is becoming more rare and kASLR, >> > already available on x86, will be available on arm64 and MIPS soon), >> > this changes the default to preferring kASLR over hibernation. Users >> > wanting hibernation can turn off kASLR by adding "nokaslr" to the kernel >> > command line. >> > >> > Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org> >> > Signed-off-by: Kees Cook <keescook@...omium.org> >> >> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> >> >> Or do you want me to apply it? > > 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. Thanks, Rafael
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