Re: [PATCH 2/2] Add an x86 IFUNC testcase for [BZ #20019]

[Joseph Myers <joseph at codesourcery dot com>]

On Tue, 4 Oct 2016, H.J. Lu wrote:

> If an IFUNC function is called before the providing shared library is
> unrelocated, ld.so may segfault.  Add a testcase to verify that ld.so
> will issue a diagnostic and won't segfault in this case.
> 
> Tested on i686 and x86-64.  OK for master?

I can't see anything x86-specific about these tests.  If they are meant to 
work, they should work on all architectures, and so should be 
architecture-independent.  Is the architecture-specific thing the use of 
memmove as a function that uses IFUNCs?  If so, the tests should still 
work on other architectures, just maybe be less effective as tests (and 
other architecture maintainers could always add a hook to use another 
function instead of memmove).

If you suspect other architectures might have similar bugs requiring fixes 
for these tests to pass but don't want to make such changes yourself, you 
should follow the usual process for changes made only for some 
architectures: post a detailed description of how to tell whether the 
change is needed for your architecture and how to make the change, CC: to 
the relevant architecture maintainers, and add an entry to 
https://sourceware.org/glibc/wiki/PortStatus (once the x86 changes are 
in), listing the possibly affected (i.e. IFUNC-supporting?) architectures 
on that page.

-- 
Joseph S. Myers
joseph@codesourcery.com