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In-Reply-To: <dc70c1f2-ac86-495b-d1f0-473f21408827@redhat.com>
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Tue, 21 Feb 2023 13:53:20 -0800
Message-ID: <CAMe9rOq9a2Hdo=i2HLdfC4nACx6YK_xXf8KCtPiUg_7DX_oZ7A@mail.gmail.com>
Subject: Re: [PATCH v2] x86-64: Add glibc.cpu.prefer_map_32bit_exec [BZ #28656]
To: "Carlos O'Donell" <carlos@redhat.com>
Cc: libc-alpha@sourceware.org, Florian Weimer <fweimer@redhat.com>
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On Tue, Feb 21, 2023 at 1:42 PM Carlos O'Donell <carlos@redhat.com> wrote:
>
> On 2/21/23 11:35, H.J. Lu wrote:
> >>> +/* Check that LD_PREFER_MAP_32BIT_EXEC works in PDE and shared library.
> >>
> >> s/PDE/PIE/g ?
> >
> > This feature won't work for PIE since PIE is usually loaded at a
> > random address above
> > 4GB by kernel. On the other hand, PDE (no-PIE) is loaded at a fixed
> > address below 2GB.
>
> Thanks. That makes sense. Leave this as PDE then and we'll start using PDE
> everywhere we might have written no-PIE :-)
>
> --
> Cheers,
> Carlos.
>

I sent the v3.

Thanks.

-- 
H.J.