[Bug ld/28824] relro security issues

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28824

--- Comment #23 from Alan Modra <amodra at gmail dot com> ---
(In reply to Rui Ueyama from comment #21)
> How about splitting the .got section into two
The .got.plt actually (which on x86_64 GNU ld is the section having 3 reserved
entries then the R_X86_64_JUMP_SLOT entries).  I'm so rusty on the x86 ABIs
that I can't give an answer on whether this proposal would break the ABI.

(In reply to Fangrui Song from comment #22)
> If GNU ld now uses max-page-size boundary for all ports but x86, I think
> https://sourceware.org/binutils/docs/ld/Builtin-Functions.html 
> "DATA_SEGMENT_ALIGN(maxpagesize, commonpagesize)" needs a clarification: it
> seels that commonpagesize is ignored for most ports?
GNU ld uses maxpagesize for the end of the relro segment for all targets,
including x86.  And yes, DATA_SEGMENT_ALIGN behaves differently with -z relro.

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