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Message-ID: <20190208151502.GC32494@hirez.programming.kicks-ass.net>
Date: Fri, 8 Feb 2019 16:15:02 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: "Reshetova, Elena" <elena.reshetova@...el.com>
Cc: "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
"luto@...nel.org" <luto@...nel.org>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"mingo@...hat.com" <mingo@...hat.com>,
"bp@...en8.de" <bp@...en8.de>,
"keescook@...omium.org" <keescook@...omium.org>,
"tytso@....edu" <tytso@....edu>
Subject: Re: [RFC PATCH] x86/entry/64: randomize kernel stack offset upon
system call
On Fri, Feb 08, 2019 at 01:20:09PM +0000, Reshetova, Elena wrote:
> > On Fri, Feb 08, 2019 at 02:15:49PM +0200, Elena Reshetova wrote:
> I can measure the impact with rdtsc(), I think it is *very* small.
> Btw, what should be the good measurement test?
> I am not that happy with just looping on fopen-fclose, too
> much noise.
IIRC amluto had a nice micro-bench for 'pure' syscall overhead
somewhere.
Something like getpid/gettid in a loop should work fairly well, that's a
really light syscall to make.
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