[Bug dynamic-link/18928] LD_POINTER_GUARD is not ignored for privileged binaries

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18928

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=dc22a1ec157d02529a0b17986679d3f1c122985e

commit dc22a1ec157d02529a0b17986679d3f1c122985e
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Oct 15 09:23:07 2015 +0200

    Always enable pointer guard [BZ #18928]

    Honoring the LD_POINTER_GUARD environment variable in AT_SECURE mode
    has security implications.  This commit enables pointer guard
    unconditionally, and the environment variable is now ignored.

            [BZ #18928]
            * sysdeps/generic/ldsodefs.h (struct rtld_global_ro): Remove
            _dl_pointer_guard member.
            * elf/rtld.c (_rtld_global_ro): Remove _dl_pointer_guard
            initializer.
            (security_init): Always set up pointer guard.
            (process_envvars): Do not process LD_POINTER_GUARD.

    (cherry picked from commit a014cecd82b71b70a6a843e250e06b541ad524f7)

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

Summary of changes:
 ChangeLog                  |   10 ++++++++++
 NEWS                       |    5 ++++-
 elf/rtld.c                 |   15 ++++-----------
 sysdeps/generic/ldsodefs.h |    3 ---
 4 files changed, 18 insertions(+), 15 deletions(-)

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