[PATCH] D20024: [ELF] - Protect first entries of got.plt with RelRo.

[H.J. Lu via llvm-commits]

On Mon, May 9, 2016 at 8:46 AM, Rafael Espíndola
<rafael.espindola at gmail.com> wrote:
> I was able to link and run the musl  dynamic linker with the patch that
> stops setting got[0].
>
> So, Rui, what is your take on this? Should we leave that out of tree until
> it is time to try to link glibc's dynamic linker?
>

If you do so, please state clearly that your linker doesn't follow
x86-64 psABI which says:

The tables first entry (number zero) is reserved to hold the address of the dy-
namic structure, referenced with the symbol _DYNAMIC. This allows a program,
such as the dynamic linker, to find its own dynamic structure without having yet
processed its relocation entries. This is especially important for the dynamic
linker, because it must initialize itself without relying on other
programs to re-
locate its memory image.

-- 
H.J.