[Bug libc/22156] [hppa,ia64,microblaze] Executable stack default

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https://sourceware.org/bugzilla/show_bug.cgi?id=22156

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=12ef66c411efe5910f0a9a74c92480db7e12eae0

commit 12ef66c411efe5910f0a9a74c92480db7e12eae0
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Tue Sep 26 16:30:46 2017 +0000

    Fix ia64 executable stack default (bug 22156).

    As per https://gcc.gnu.org/ml/gcc-patches/2017-09/msg01220.html ia64
    defaults to non-executable stacks in the Linux kernel (furthermore,
    the use of function descriptors means that trampolines for nested
    function pointers never need an executable stack).  glibc however
    defines DEFAULT_STACK_PERMS to include PF_X for that architecture,
    meaning (a) elf/check-execstack fails and (b) (from code inspection,
    not tested, but this is why I think this is a user-visible bug) thread
    stacks are unnecessarily mapped with execute permission.  This patch
    fixes the DEFAULT_STACK_PERMS definition in question.

    Tested (compilation only) with build-many-glibcs.py for ia64.  This
    fixes the check-execstack failure.

        [BZ #22156]
        * sysdeps/ia64/stackinfo.h (DEFAULT_STACK_PERMS): Likewise.

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

Summary of changes:
 ChangeLog                |    5 +++++
 sysdeps/ia64/stackinfo.h |    5 ++---
 2 files changed, 7 insertions(+), 3 deletions(-)

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