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[Bug ld/31795] ld.bfd makes ELFs of type ET_EXEC for static PIEs when lo


From: adhemerval.zanella at linaro dot org
Subject: [Bug ld/31795] ld.bfd makes ELFs of type ET_EXEC for static PIEs when load address is non-0
Date: Tue, 28 May 2024 16:25:13 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=31795

--- Comment #60 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> 
---
(In reply to mintsuki from comment #59)
> (In reply to Adhemerval Zanella from comment #58)
> > (In reply to mintsuki from comment #41)

> > So maybe we either enable this iff targeting Linux, or check if kernel is
> > willing to enforce e_entry even for DYN. 
> > 
> > I am not sure if the correct approach is relaxing the
> > '-Ttext-segment/--image-base' to be a minimum address.  For this, I would
> > add another linker option.
> 
> I am not sure what you mean with "willing to enforce e_entry".

I meant enforcing the vaddr set by e_entry for ET_DYN (and thus disabling
ASLR), so this hack won't be necessary for Linux.

> 
> In any case, how about checking what the generated ELF file's OS/ABI is and
> only doing the DYN->EXEC hack if it happens to be GNU/Linux?

That was my 'So maybe we either enable this iff targeting Linux' suggestion was
well.

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