Re: static pie support for x86 (from OpenBSD)

[Alistair Crooks <agc%pkgsrc.org@localhost>]

Is there any way the _DYNAMIC entry could be abused - to provide hints
on range of aslr, or to allow dynamic linking from within the static
binary from an abused stack or similar?

On 31 May 2017 at 05:14, Christos Zoulas <christos%astron.com@localhost> wrote:
> In article <20170531085212.GB22580%britannica.bec.de@localhost>,
> Joerg Sonnenberger  <joerg%bec.de@localhost> wrote:
>>On Tue, May 30, 2017 at 05:38:33PM -0400, Christos Zoulas wrote:
>>> I ported OpenBSD's static pie support to x86. Here's what it looks like.
>>> I left some debugging stuff in the csu Makefile that needs cleanup?
>>> Opinions? Should I add it?
>>
>>I really dislike how this is implemented.
>
> How would you do it otherwise with minimal disruption?
>
> In summary the implementation keeps an _DYNAMIC entry in the static binary,
> and adds new crt0 code (mcrt0 for profiling and rcrt0 for non) to do the
> relocations on startup (like a minimal ld.so).
>
> christos
>