From: Pavel Machek <pavel@denx.de>
To: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
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, "Rafael J. Wysocki" <rjw@rjwysocki.net>,
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] Prefer kASLR over Hibernation
Date: Wed, 6 Apr 2016 22:17:16 +0200 [thread overview]
Message-ID: <20160406201716.GA14241@amd> (raw)
In-Reply-To: <20160406194404.GA11150@www.outflux.net>
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
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>,
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, "Rafael J. Wysocki" <rjw@rjwysocki.net>,
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] Prefer kASLR over Hibernation
Date: Wed, 6 Apr 2016 22:17:16 +0200 [thread overview]
Message-ID: <20160406201716.GA14241@amd> (raw)
In-Reply-To: <20160406194404.GA11150@www.outflux.net>
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
next prev parent reply other threads:[~2016-04-06 20:17 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-06 19:44 [kernel-hardening] [PATCH] Prefer kASLR over Hibernation Kees Cook
2016-04-06 19:44 ` Kees Cook
2016-04-06 20:17 ` Pavel Machek [this message]
2016-04-06 20:17 ` Pavel Machek
2016-04-06 20:56 ` [kernel-hardening] " Linus Torvalds
2016-04-06 20:56 ` Linus Torvalds
2016-04-06 21:25 ` [kernel-hardening] " Kees Cook
2016-04-06 21:25 ` Kees Cook
2016-04-06 21:48 ` [kernel-hardening] " Ingo Molnar
2016-04-06 21:48 ` Ingo Molnar
2016-04-06 21:52 ` [kernel-hardening] " Ingo Molnar
2016-04-06 21:52 ` Ingo Molnar
2016-04-06 22:32 ` [kernel-hardening] " Rafael J. Wysocki
2016-04-06 22:32 ` Rafael J. Wysocki
2016-04-07 0:49 ` [kernel-hardening] " Ingo Molnar
2016-04-07 0:49 ` Ingo Molnar
2016-04-06 21:49 ` [kernel-hardening] " Rafael J. Wysocki
2016-04-06 21:49 ` Rafael J. Wysocki
2016-04-06 21:56 ` [kernel-hardening] " Ingo Molnar
2016-04-06 21:56 ` Ingo Molnar
2016-04-06 22:04 ` [kernel-hardening] " Rafael J. Wysocki
2016-04-06 22:04 ` Rafael J. Wysocki
2016-04-06 22:16 ` [kernel-hardening] " Kees Cook
2016-04-06 22:16 ` Kees Cook
2016-04-06 22:41 ` [kernel-hardening] " Paul Bolle
2016-04-06 22:41 ` Paul Bolle
2016-04-07 0:05 ` [kernel-hardening] " Ingo Molnar
2016-04-07 0:05 ` Ingo Molnar
2016-04-11 8:00 ` [kernel-hardening] " James Morse
2016-04-11 8:00 ` James Morse
2016-04-11 18:03 ` [kernel-hardening] " Kees Cook
2016-04-11 18:03 ` Kees Cook
2016-04-11 18:21 ` [kernel-hardening] " Geert Uytterhoeven
2016-04-11 18:21 ` Geert Uytterhoeven
2016-04-11 18:47 ` [kernel-hardening] " Kees Cook
2016-04-11 18:47 ` Kees Cook
2016-04-12 17:51 ` [kernel-hardening] " James Morse
2016-04-12 17:51 ` James Morse
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