From: Pavel Machek <pavel@denx.de>
To: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Ingo Molnar <mingo@kernel.org>, James Morse <james.morse@arm.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Matt Redfearn <matt.redfearn@imgtec.com>,
Yves-Alexis Perez <corsac@debian.org>,
Emrah Demir <ed@abdsec.com>, Jonathan Corbet <corbet@lwn.net>,
x86@kernel.org, Len Brown <len.brown@intel.com>,
Borislav Petkov <bp@suse.de>, Andy Lutomirski <luto@kernel.org>,
linux-doc@vger.kernel.org, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com
Subject: [kernel-hardening] Re: [PATCH v2] kaslr: allow kASLR to be default over Hibernation
Date: Thu, 14 Apr 2016 22:01:02 +0200 [thread overview]
Message-ID: <20160414200102.GB3856@amd> (raw)
In-Reply-To: <20160412221659.GA18102@www.outflux.net>
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@chromium.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
WARNING: multiple messages have this Message-ID (diff)
From: Pavel Machek <pavel@denx.de>
To: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Ingo Molnar <mingo@kernel.org>, James Morse <james.morse@arm.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Matt Redfearn <matt.redfearn@imgtec.com>,
Yves-Alexis Perez <corsac@debian.org>,
Emrah Demir <ed@abdsec.com>, Jonathan Corbet <corbet@lwn.net>,
x86@kernel.org, Len Brown <len.brown@intel.com>,
Borislav Petkov <bp@suse.de>, Andy Lutomirski <luto@kernel.org>,
linux-doc@vger.kernel.org, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com
Subject: Re: [PATCH v2] kaslr: allow kASLR to be default over Hibernation
Date: Thu, 14 Apr 2016 22:01:02 +0200 [thread overview]
Message-ID: <20160414200102.GB3856@amd> (raw)
In-Reply-To: <20160412221659.GA18102@www.outflux.net>
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@chromium.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
next prev parent reply other threads:[~2016-04-14 20:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-12 22:16 [kernel-hardening] [PATCH v2] kaslr: allow kASLR to be default over Hibernation Kees Cook
2016-04-12 22:16 ` Kees Cook
2016-04-14 20:01 ` Pavel Machek [this message]
2016-04-14 20:01 ` Pavel Machek
2016-04-14 20:14 ` [kernel-hardening] " Kees Cook
2016-04-14 20:14 ` Kees Cook
2016-04-14 20:34 ` [kernel-hardening] " Pavel Machek
2016-04-14 20:34 ` Pavel Machek
2016-04-14 22:42 ` [kernel-hardening] " Kees Cook
2016-04-14 22:42 ` Kees Cook
2016-04-15 9:20 ` [kernel-hardening] " Ingo Molnar
2016-04-15 9:20 ` Ingo Molnar
2016-04-15 13:06 ` [kernel-hardening] " Pavel Machek
2016-04-15 13:06 ` Pavel Machek
2016-04-15 16:25 ` [kernel-hardening] " Emrah Demir
2016-04-15 16:25 ` Emrah Demir
2016-04-16 19:58 ` [kernel-hardening] " Pavel Machek
2016-04-16 19:58 ` Pavel Machek
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