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Re: RFC: Add PT_GNU_PROPERTY to cover .note.gnu.property section


On Tue, Dec 4, 2018 at 5:57 AM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> On Wed, Nov 28, 2018 at 9:27 AM H.J. Lu <hjl.tools@gmail.com> wrote:
> >
> > On Tue, Nov 27, 2018 at 3:59 PM H.J. Lu <hjl.tools@gmail.com> wrote:
> > >
> > > On Tue, Nov 27, 2018 at 11:25 AM H.J. Lu <hjl.tools@gmail.com> wrote:
> > > >
> > > > On Tue, Nov 27, 2018 at 9:56 AM Cary Coutant <ccoutant@gmail.com> wrote:
> > > > >
> > > > > > > > PT_GNU_PROPERTY isn't compatible with existing loaders.  This needs
> > > > > > > > to be both forward and backward compatible.
> > > > > > >
> > > > > > > Which loaders?  The kernel?
> > > > > >
> > > > > > Kernel, glibc, gdb, .....
> > > > >
> > > > > How is that any different from using PT_NOTE? Existing loaders don't
> > > > > handle that either.
> > > > >
> > > > > If you're claiming that a new PT_ value in the program header table
> > > > > will be rejected by existing loaders, that's a bug. It should be
> > > > > fixed. The whole principle of ELF extensibility relies on that.
> > > >
> > > > Add PT_GNU_PROPERTY to cover .note.gnu.property section?
> > >
> > > Like:
> > >
> > > 1. Add PT_GNU_PROPERTY segment type.
> > >
> > >  # define PT_GNU_PROPERTY (PT_LOOS + 0x474e553)
> > >
> > > which covers .note.gnu.property section.
> > > 2. Remove GNU_PROPERTY_X86_UINT32_VALID.
> > >
> >
> > Here is a patch.  The updated pdf is at
> >
> > https://github.com/hjl-tools/linux-abi/wiki/linux-abi-draft.pdf
>
> Here is the patch to support PT_GNU_PROPERTY.   Any comments?
>

I am checking it in tomorrow.


-- 
H.J.


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