[Bug dynamic-link/20019] NULL pointer dereference in libc.so.6 IFUNC due to uninitialized GOT

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https://sourceware.org/bugzilla/show_bug.cgi?id=20019

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0e6d3adc60d8073397af6a320e594d98d7fbedde

commit 0e6d3adc60d8073397af6a320e594d98d7fbedde
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Oct 28 09:11:55 2016 -0700

    Check IFUNC definition in unrelocated shared library [BZ #20019]

    Calling an IFUNC function defined in unrelocated shared library may
    lead to segfault.  This patch issues an error message to request
    relinking the shared library if it references IFUNC function defined
    in the unrelocated shared library.

        [BZ #20019]
        * sysdeps/i386/dl-machine.h (elf_machine_rel): Check IFUNC
        definition in unrelocated shared library.
        * sysdeps/x86_64/dl-machine.h (elf_machine_rela): Likewise.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                   |    7 +++++++
 sysdeps/i386/dl-machine.h   |   18 +++++++++++++++++-
 sysdeps/x86_64/dl-machine.h |   18 +++++++++++++++++-
 3 files changed, 41 insertions(+), 2 deletions(-)

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