protected data in a DSO with copy relocation

[Ondřej Bílka]

On Wed, Dec 17, 2014 at 03:22:53PM -0800, H.J. Lu wrote:
> On Wed, Dec 17, 2014 at 2:53 PM, Roland McGrath <roland@hack.frob.com> wrote:
> >> I'd like to have a decision on
> >>
> >> https://sourceware.org/bugzilla/show_bug.cgi?id=17711
> >>
> >> If we want to support protected data in a DSO with copy relocation,
> >> which will incur run-time and memory overhead, I can prepare ld.so
> >> as well as linker patches.  Otherwise, I will make a linker patch
> >> to disallow protected data in a DSO with copy relocation.
> >
> > I think we certainly shouldn't do any rtld changes for this in the current
> > cycle.  If we can just punt thinking about it at all until after this
> 
> If we punt, we need to update the elf/vismain test which fails with
> the current ld.
> 
> > release, that would be best.  If we need some kind of decision sooner, then
> > my inclination is to say that STV_PROTECTED is not useful enough to spend
> > effort on supporting its corner cases.  I'm not aware of uses cases for it
> > that both appear in the real world and are actually worthwhile.  But if
> > there is no urgent need, then let's discuss this in detail after the release.
> 
> I agree.
> 
I also think it should not be supported. I see another potential problem
that it makes maintainance harder, for example uses it and forgots bump 
Makefile requirements then when somebody with older system will run to 
this problem.