[Bug dynamic-link/18134] x86 ld.so doesn't preserve bound registers

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https://sourceware.org/bugzilla/show_bug.cgi?id=18134

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=14c5cbabc2d11004ab223ae5eae761ddf83ef99e

commit 14c5cbabc2d11004ab223ae5eae761ddf83ef99e
Author: Igor Zamyatin <igor.zamyatin@intel.com>
Date:   Thu Jul 9 06:50:12 2015 -0700

    Preserve bound registers for pointer pass/return

    We need to save/restore bound registers and add a BND prefix before
    branches in _dl_runtime_profile so that bound registers for pointer
    pass and return are preserved when LD_AUDIT is used.

        [BZ #18134]
        * sysdeps/i386/configure.ac: Set HAVE_MPX_SUPPORT.
        * sysdeps/i386/configure: Regenerated.
        * sysdeps/i386/dl-trampoline.S (PRESERVE_BND_REGS_PREFIX): New.
        (_dl_runtime_profile): Save and restore Intel MPX return bound
        registers when calling _dl_call_pltexit.  Add
        PRESERVE_BND_REGS_PREFIX before return.
        * sysdeps/i386/link-defines.sym (LRV_BND0_OFFSET): New.
        (LRV_BND1_OFFSET): Likewise.
        * sysdeps/x86/bits/link.h (La_i86_retval): Add lrv_bnd0 and
        lrv_bnd1.
        * sysdeps/x86_64/dl-trampoline.S (_dl_runtime_profile): Fix
        typo in bndmov encoding.
        * sysdeps/x86_64/dl-trampoline.h: Properly save and restore
        Intel MPX bound registers.  Add PRESERVE_BND_REGS_PREFIX before
        branch instructions to preserve bounds.

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

Summary of changes:
 ChangeLog                      |   20 +++++++++++++++++++
 NEWS                           |   14 ++++++------
 sysdeps/i386/configure         |   27 ++++++++++++++++++++++++++
 sysdeps/i386/configure.ac      |   15 ++++++++++++++
 sysdeps/i386/dl-trampoline.S   |   21 ++++++++++++++++++++
 sysdeps/i386/link-defines.sym  |    2 +
 sysdeps/x86/bits/link.h        |    2 +
 sysdeps/x86_64/dl-trampoline.S |    4 +-
 sysdeps/x86_64/dl-trampoline.h |   41 ++++++++++++++++++++++-----------------
 9 files changed, 119 insertions(+), 27 deletions(-)

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