Date: Wed, 6 Apr 2016 22:17:16 +0200 From: Pavel Machek <pavel@...x.de> To: Kees Cook <keescook@...omium.org> Cc: 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>, Borislav Petkov <bp@...e.de>, Andy Lutomirski <luto@...nel.org>, linux-doc@...r.kernel.org, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com Subject: Re: [PATCH] Prefer kASLR over Hibernation Hi! > 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. I must say I don't exactly like this patch. Why is kASLR incompatible with hibernation? We can hibernate have 4.3 kernel resume hibernation image of 4.2 kernel (on x86-64, and I have patches for x86). Resuming kernel with different randomization does not look that much different... Best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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