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Re: [RFC] [MIPS] Enable non-executable PT_GNU_STACK support v2

On Thu, 22 Dec 2016, Joseph Myers wrote:

> It's only if a version was released in glibc that you can't reassign it.  
> I don't see why you can't change binutils to use version 4 for GNU_STACK 
> (and then 5 for IFUNC), probably including on 2.27 branch - binaries built 
> to use version 5 for GNU_STACK just won't work with glibc until it gets 
> IFUNC support.  The relevant rule is: glibc doesn't claim to support a 
> version unless it supports all ABIs <= that version (that is, all ABIs 
> used by binaries that give a version <= that version).
> It's OK for binaries to specify an ABI version higher than they require 
> (which would, effectively, be the case for binaries built now that use 
> version 5 for GNU_STACK - version 5 meaning, under the reassigned numbers, 
> that you need a glibc supporting all of MIPS_PLT, UNIQUE, MIPS_O32_FP64, 
> GNU_STACK and IFUNC - which is a stricter requirement than necessary, but 
> it's OK for binaries to specify stricter requirements than necessary).

 OK, this makes sense to me, thanks for the clarification.

 Change reverted now then with commit 4d4f40e041ce ("MIPS/BFD: Remove 
EI_ABIVERSION 5 allocation for PT_GNU_STACK support") and backported to 
2.28 and 2.27 branches.

 Happy festive season, everyone!


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