Date: Thu, 14 Apr 2016 22:01:02 +0200 From: Pavel Machek <pavel@...x.de> To: Kees Cook <keescook@...omium.org> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, Ingo Molnar <mingo@...nel.org>, James Morse <james.morse@....com>, 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, 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 v2] kaslr: allow kASLR to be default over Hibernation Hi! > Since kASLR and Hibernation can not currently coexist at runtime > on x86, the default behavior was to disable kASLR by default when > CONFIG_HIBERNATION was present (to retain original behavior). > > The behavior of kASLR on arm64 (and soon MIPS) is to be enabled by > default when selected at build time. Since arm64 Hibernation does not > conflict with kASLR, this fixes the hibernation argument parsing to be > x86-specific. Additionally, since end users want to be able to select > kASLR on x86 by default at build time, create CONFIG_RANDOMIZE_BASE_ON > that is present only on x86. > > Signed-off-by: Kees Cook <keescook@...omium.org> I believe this is bad idea. arm64 shows that kaslr and hibernation can coexist, and hibernation is still useful when your battery runs out. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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