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Date: Fri, 13 Jul 2018 00:22:59 +0300
From: Alexander Popov <alex.popov@...ux.com>
To: Ingo Molnar <mingo@...nel.org>, Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
 Kernel Hardening <kernel-hardening@...ts.openwall.com>,
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 Ard Biesheuvel <ard.biesheuvel@...aro.org>, Borislav Petkov <bp@...en8.de>,
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 Thomas Gleixner <tglx@...utronix.de>, Peter Anvin <hpa@...or.com>,
 Peter Zijlstra <a.p.zijlstra@...llo.nl>, "Dmitry V. Levin"
 <ldv@...linux.org>, Emese Revfy <re.emese@...il.com>,
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 Andrey Konovalov <andreyknvl@...gle.com>,
 the arch/x86 maintainers <x86@...nel.org>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v14 0/6] Introduce the STACKLEAK feature and a test for it

Hello Ingo,

On 12.07.2018 23:50, Ingo Molnar wrote:
> Let's make sure informed users have an easy runtime way out
> from the worst of the overhead that doesn't involve "recompile your distro 
> kernel". Also, make it easier to measure and fingerpoint the overhead...

Would you like the following solution?

I'll create the CONFIG_STACKLEAK_RUNTIME_DISABLE config option, which would be
similar to CONFIG_SECURITY_SELINUX_DISABLE. That option will provide a sysctl
switch disabling stackleak_erase(), which provides the most of performance penalty.

I can design this as a 7th patch in this series.

Best regards,
Alexander

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