Why does _dl_protect_relro align the end address down?

[Adhemerval Zanella Netto]

On 17/01/23 04:57, Florian Weimer via Libc-help wrote:
> * Joel Molin via Libc-help:
> 
>> Since mprotect will protect entire pages anyway, wouldn't it make a lot
>> more sense here to say `end = ALIGN_UP(...)`? Apart from feeling more
>> intuitive, it also seems like it would avoid page size inconsistencies
>> between runtime and link editing like the one above.
> 
> ALIGN_UP might make memory read-only that should not be.
> 
> There's some discussion about the alignment here:
> 
>   PT_GNU_RELRO is somewhat broken
>   <https://sourceware.org/pipermail/libc-alpha/2022-May/138638.html>
> 
> I still think this is fairly broken, but there does not seem to be much
> desire to fix it.

It was not clear to me from that discussion what you think it is still
broken with PT_GNU_RELRO.