[Bug libc/18023] extend_alloca is broken (questionable pointer comparison, horrible machine code)

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18023

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=92d6aa8528f2ddab2361bc160a96b9cd3c497a11

commit 92d6aa8528f2ddab2361bc160a96b9cd3c497a11
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Jun 27 17:55:55 2018 +0200

    _dl_map_object_deps: Use struct scratch_buffer [BZ #18023]

    The function comment suggests that _dl_map_object_deps cannot use
    malloc, but it already allocates the l_initfini array on the heap, so
    the additional allocation should be acceptable.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=890c2ced35cfbf2de7d787fd37caf23d250da531

commit 890c2ced35cfbf2de7d787fd37caf23d250da531
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Jun 27 17:55:38 2018 +0200

    gethostid (Linux variant): Switch to struct scratch_buffer [BZ #18023]

    Previously, extend_alloca was used without alloca accounting,
    which could have been problematic with large NSS results.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4272059de256fb20a7b19b5f8509e0c8d27beaf4

commit 4272059de256fb20a7b19b5f8509e0c8d27beaf4
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Jun 27 17:54:44 2018 +0200

    wordexp: Rewrite parse_tilde to use struct scratch_buffer [BZ #18023]

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

Summary of changes:
 ChangeLog                           |   18 +++++++++++++
 elf/dl-deps.c                       |   28 +++++++++++--------
 posix/wordexp.c                     |   46 +++++++++++++++++++++------------
 sysdeps/unix/sysv/linux/gethostid.c |   48 ++++++++++++++++++++++------------
 4 files changed, 94 insertions(+), 46 deletions(-)

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