[Bug ld/31795] ld.bfd makes ELFs of type ET_EXEC for static PIEs when load address is non-0

[mintsuki at protonmail dot com]

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

--- Comment #53 from mintsuki <mintsuki at protonmail dot com> ---
(In reply to H.J. Lu from comment #51)
> (In reply to mintsuki from comment #50)
> 
> > > Why can't you check DF_1_PIE for PIE?
> > 
> > That is what I do now, but to check for *relocatability*. PIE in and of
> > itself is not something that tells me whether I should relocate (for KASLR
> > for example) or not. That is what you just said.
> 
> If DF_1_PIE is set, the binary can be relocated to any address. What did I
> miss?

This? :

> > > > Earlier you said I should check DF_1_PIE to determine relocatability... 
> > > > so
> > > 
> > > No, that was not what I said.  DF_1_PIE can be used to determine if a 
> > > binary
> > > is PIE.

You said setting the text segment base address to non-0 means the load address
has to be the one specified, due to the ELF type being forced to ET_EXEC by
your linker; thus you *cannot* relocate it to any address. Linux *does not*
relocate it, in fact, and ASLR is not done.

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