Date: Thu, 4 Jan 2018 00:22:32 +0100
From: Lars Wendler <wendler.lars@web.de>
To: Borislav Petkov <bp@alien8.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
        LKML <linux-kernel@vger.kernel.org>, x86@kernel.org,
        Andy Lutomirski <luto@kernel.org>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Greg KH <gregkh@linuxfoundation.org>
Subject: Re: CONFIG_PAGE_TABLE_ISOLATION=y on x86_64 causes gcc to segfault
 when building x86_32 binaries
Message-ID: <20180104002232.7927cfc6@abudhabi.paradoxon.rec>
In-Reply-To: <20180103154008.7rd4moyd2f7t3wt5@pd.tnic>
References: <20180103123723.1dd26828@abudhabi.paradoxon.rec>
        <alpine.DEB.2.20.1801031256440.1957@nanos>
        <alpine.DEB.2.20.1801031259530.1957@nanos>
        <20180103143036.60e592eb@abudhabi.paradoxon.rec>
        <20180103154008.7rd4moyd2f7t3wt5@pd.tnic>
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Am Wed, 3 Jan 2018 16:40:08 +0100
schrieb Borislav Petkov <bp@alien8.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. =20
>=20
> So gentoo recently broke the kernel, see
>=20
> 3ce120b16cc5 ("kbuild: add '-fno-stack-check' to kernel build
> options")
>=20
> 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.
>=20
> Just a stab in the dark though: if you build your hello world program
> with -fno-stack-check, does it segfault still?
>=20
> Thx.
>=20

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

Kind regards
Lars

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