[Bug dynamic-link/21209] LD_HWCAP_MASK read in setuid binaries

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https://sourceware.org/bugzilla/show_bug.cgi?id=21209

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3776f38fcd267c127ba5eb222e2c614c191744aa

commit 3776f38fcd267c127ba5eb222e2c614c191744aa
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date:   Tue Jun 20 05:59:17 2017 +0200

    Ignore and remove LD_HWCAP_MASK for AT_SECURE programs (bug #21209)

    The LD_HWCAP_MASK environment variable may alter the selection of
    function variants for some architectures.  For AT_SECURE process it
    means that if an outdated routine has a bug that would otherwise not
    affect newer platforms by default, LD_HWCAP_MASK will allow that bug
    to be exploited.

    To be on the safe side, ignore and disable LD_HWCAP_MASK for setuid
    binaries.

        [BZ #21209]
        * elf/rtld.c (process_envvars): Ignore LD_HWCAP_MASK for
        AT_SECURE processes.
        * sysdeps/generic/unsecvars.h: Add LD_HWCAP_MASK.
        * elf/tst-env-setuid.c (test_parent): Test LD_HWCAP_MASK.
        (test_child): Likewise.
        * elf/Makefile (tst-env-setuid-ENV): Add LD_HWCAP_MASK.

    (cherry picked from commit 1c1243b6fc33c029488add276e56570a07803bfd)

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

Summary of changes:
 ChangeLog                   |   10 ++++++++++
 NEWS                        |    1 +
 elf/Makefile                |    3 ++-
 elf/rtld.c                  |    3 ++-
 elf/tst-env-setuid.c        |   12 ++++++++++++
 sysdeps/generic/unsecvars.h |    1 +
 6 files changed, 28 insertions(+), 2 deletions(-)

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