linux-kernel - Re: CONFIG_PAGE_TABLE_ISOLATION=y on x86_64 causes gcc to segfault when building x86

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Message-ID: <20180104002232.7927cfc6@abudhabi.paradoxon.rec>
Date:   Thu, 4 Jan 2018 00:22:32 +0100
From:   Lars Wendler <wendler.lars@....de>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: CONFIG_PAGE_TABLE_ISOLATION=y on x86_64 causes gcc to segfault
 when building x86_32 binaries

Am Wed, 3 Jan 2018 16:40:08 +0100
schrieb Borislav Petkov <bp@...en8.de>:

> On Wed, Jan 03, 2018 at 02:30:36PM +0100, Lars Wendler wrote:
> > Same problem with 4.15-rc6. So I suppose that means it's a general
> > issue.  
> 
> So gentoo recently broke the kernel, see
> 
> 3ce120b16cc5 ("kbuild: add '-fno-stack-check' to kernel build
> options")
> 
> and you say you hit the same problem with -rc6 and that commit is in
> there so your kernel is probably built with -fno-stack-check.
> 
> Just a stab in the dark though: if you build your hello world program
> with -fno-stack-check, does it segfault still?
> 
> Thx.
> 

The issue you mention here only affects Gentoo hardened installations
which I never used.

Kind regards
Lars

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