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Date: Fri, 13 Jul 2018 00:22:59 +0300
From: Alexander Popov <>
To: Ingo Molnar <>, Kees Cook <>
Cc: Linus Torvalds <>,
 Kernel Hardening <>,
 Pax Team <>, Brad Spengler <>,
 Andrew Lutomirski <>, Tycho Andersen <>,
 Laura Abbott <>, Mark Rutland <>,
 Ard Biesheuvel <>, Borislav Petkov <>,
 Richard Sandiford <>,
 Thomas Gleixner <>, Peter Anvin <>,
 Peter Zijlstra <>, "Dmitry V. Levin"
 <>, Emese Revfy <>,
 Jonathan Corbet <>, Andrey Ryabinin <>,
 "Kirill A. Shutemov" <>,
 Thomas Garnier <>,
 Andrew Morton <>,
 Alexei Starovoitov <>, Josef Bacik <>,
 Masami Hiramatsu <>, Nick Piggin <>,
 Al Viro <>, David Miller <>,
 dingtianhong <>, David Woodhouse <>,
 Josh Poimboeuf <>, Steven Rostedt <>,
 Dominik Brodowski <>, Jürgen Groß <>,
 Greg Kroah-Hartman <>,
 Dan Williams <>,
 Dave Hansen <>,
 Mathias Krause <>,
 Vikas Shivappa <>, Kyle Huey
 <>, Dmitry Safonov <>,
 Will Deacon <>, Arnd Bergmann <>,
 Florian Weimer <>,
 Boris Lukashev <>,
 Andrey Konovalov <>,
 the arch/x86 maintainers <>,
 Linux Kernel Mailing List <>
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,

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