[Bug dynamic-link/16888] ARM dynamic linker mishandles R_ARM_IRELATIVE RELA relocations

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https://sourceware.org/bugzilla/show_bug.cgi?id=16888

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=60c8f1f60b45fb5ba02a0f76ff4b9fda203935e5

commit 60c8f1f60b45fb5ba02a0f76ff4b9fda203935e5
Author: Julian Brown <julian@codesourcery.com>
Date:   Wed Apr 30 16:17:59 2014 +0000

    ARM: Fix R_ARM_IRELATIVE RELA relocations.

    This patch fixes what I believe to be a bug in the handling of
    R_ARM_IRELATIVE RELA relocations. At present, these are handled the
    same as REL relocations: i.e. the addend is loaded from the relocation
    address. Most of the time this isn't a problem because RELA relocations
    aren't used on ARM (GNU/Linux at least) anyway, but it causes problems
    with prelink, which uses RELA on all targets for its conflict table.
    (Support for ifunc prelinking requires a prelink patch, not yet posted.)

    Anyway, this patch works, though I'm not 100% sure if it is correct: I
    notice that this code path received attention last year:

    https://sourceware.org/ml/libc-ports/2013-07/msg00000.html

    I'm not sure under what circumstances that patch would have had an
    effect, nor if my patch conflicts with that case.

    No regressions using Mentor's usual glibc cross-testing infrastructure.

        [BZ #16888]
        * sysdeps/arm/dl-machine.h (elf_machine_rela): Fix R_ARM_IRELATIVE
        handling.

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

Summary of changes:
 ChangeLog                |    6 ++++++
 NEWS                     |    2 +-
 sysdeps/arm/dl-machine.h |    2 +-
 3 files changed, 8 insertions(+), 2 deletions(-)

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