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Re: `exec shield' test in configure too strict?

From: Camm Maguire
Subject: Re: `exec shield' test in configure too strict?
Date: 22 Oct 2004 17:02:38 -0400
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2


"Jan D." <address@hidden> writes:

> >> Another idea: can `main' contain code to move its heap address to the
> >> desired place, at startup?
> >
> >     No, as the desired place is not a mapped memory region, you can
> > not write
> >     there.
> >
> > How about mapping a memory region at the desired place, then
> > putting the heap address there?
> It could work, but sounds tricky, you would have to mmap exactly
> between BSS and the heap.  It is possible that the kernel could
> reject such a request.  I haven't tested it though.
> >       But we could do as described by Camm Maguire, check if the
> > heap is not
> >     at the correct place at temacs startup, and if it is not, call
> >     personality(LINUX32) and exec() temacs again.
> >
> > That also seems like a good method, perhaps better.  It would require
> > testing whether the symbols pertaining to personalites are developed,
> > but that is a test done by compilation, so it should be
> > unproblematical.
> I have checked in this method now.  I actually have an unexelf.c that
> works
> with exec-shield on now, but I have only tested it on Fedora Core 2.  It
> is probably too risky to check it in this close to a release.

I'd be interested to see your unexelf.c patch.

Take care,

>       Jan D.
> _______________________________________________
> Emacs-devel mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/emacs-devel

Camm Maguire                                            address@hidden
"The earth is but one country, and mankind its citizens."  --  Baha'u'llah

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