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Date:   Thu, 2 Nov 2017 13:56:38 +0100 (CET)
From:   Thomas Gleixner <>
To:     Andy Lutomirski <>
cc:     Andy Lutomirski <>,
        Linus Torvalds <>,
        Dave Hansen <>,
        "" <>,
        "" <>,,
        Daniel Gruss <>,, Kees Cook <>,
        Hugh Dickins <>, X86 ML <>
Subject: Re: [PATCH 02/23] x86, kaiser: do not set _PAGE_USER for init_mm
 page tables

On Thu, 2 Nov 2017, Andy Lutomirski wrote:
> > On Nov 2, 2017, at 12:33 PM, Thomas Gleixner <> wrote:
> > Fair enough. I enabled function tracing with emulate_vsyscall as the filter
> > on a couple of machines and so far I have no hit at all. Though I found a
> > VM with a real old user space (~2005) and that actually used it.
> > 
> > So for the problem at hand, I'd suggest we disable the vsyscall stuff if
> > CONFIG_KAISER=y and be done with it.
> I think that time() on not-so-old glibc uses it.


> Even more recent versions of Go use it. :(

Groan. VDSO is there since 2007 and the first usable version of Go was
released in 2012.....



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