Re: RFC: Add SHT_GNU_PHDRS

["H.J. Lu" <hjl dot tools at gmail dot com>]

On Thu, Sep 27, 2018 at 5:42 AM, Florian Weimer <fweimer@redhat.com> wrote:
> * H. J. Lu:
>
>> On Thu, Sep 27, 2018 at 3:35 AM, Szabolcs Nagy <nsz@port70.net> wrote:
>>> an alloc .phdr section covering the program headers solves
>>> this problem. if sections are not required for segments
>>> then simply the linker should ensure that there is always
>>> a load segment covering the program headers, possibly
>>> without containing any sections, however elf says
>>> "An object file segment contains one or more sections".
>>>
>>> i don't understand why a zero-size section is enough, what
>>> if phdr > pagesize? will that get covered by the load
>>> segment that is created for the zero-size section?
>>
>> Linker must keep this zero-size section in output and
>> create a PT_LOAD segment to cover it even if it is
>> the only SHF_ALLOC section in the PT_LOAD segment.
>
> Based on Szabolcs' comment, I don't think the section can be zero-sized.
>

Why can't we put a zero-size section in a PT_LOAD segment?
Of course, we need to change linker to do it.

-- 
H.J.