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Re: RFC: Add --enable-static-pie to build static executables as PIE
- From: Alan Modra <amodra at gmail dot com>
- To: Szabolcs Nagy <szabolcs dot nagy at arm dot com>
- Cc: "H.J. Lu" <hjl dot tools at gmail dot com>, nd at arm dot com, Rich Felker <dalias at libc dot org>, GNU C Library <libc-alpha at sourceware dot org>
- Date: Wed, 19 Jul 2017 17:01:45 +0930
- Subject: Re: RFC: Add --enable-static-pie to build static executables as PIE
- Authentication-results: sourceware.org; auth=none
- References: <CAMe9rOpAVyDYwe5o3S+0T96Ryeug=qHwgbQguGL4kaqJOrKViw@mail.gmail.com> <20170717222937.GQ1627@brightrain.aerifal.cx> <CAMe9rOozp6T25FzpP41S+PaWmANa955=K8hZcFagmFfoaQKgSA@mail.gmail.com> <20170718042500.GI14520@bubble.grove.modra.org> <CAMe9rOq3h1mvrLUn7CQ9vJ=NmERhr=Hb1KHu7-zkA6aKKT7WHA@mail.gmail.com> <20170718134800.GK14520@bubble.grove.modra.org> <596E2779.4000109@arm.com>
On Tue, Jul 18, 2017 at 04:21:29PM +0100, Szabolcs Nagy wrote:
> On 18/07/17 14:48, Alan Modra wrote:
> > On Tue, Jul 18, 2017 at 05:30:48AM -0700, H.J. Lu wrote:
> >> On Mon, Jul 17, 2017 at 9:25 PM, Alan Modra <amodra@gmail.com> wrote:
> >> Linker needs to support --no-dynamic-linker.
> >
> > Is there really much to be gained from PIEs that don't use ld.so
> > versus those that do?
> >
>
> in glibc ld.so in principle only works with one particular
> version of glibc, you cannot move a static linked pie binary
> to another system if it has ld.so dependency.
That is persuasive, if true. How does the dependency arise if the
only reference to ld.so is via PT_INTERP?
--
Alan Modra
Australia Development Lab, IBM