[Bug dynamic-link/16634] Application calling dlopen("./a.out",...) may run into _dl_allocate_tls_init: Assertion `listp != ((void *)0)' failed!

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

https://sourceware.org/bugzilla/show_bug.cgi?id=16634

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a42faf59d6d9f82e5293a9ebcc26d9c9e562b12b

commit a42faf59d6d9f82e5293a9ebcc26d9c9e562b12b
Author: Paul Pluzhnikov <ppluzhnikov@google.com>
Date:   Mon Mar 24 10:58:26 2014 -0700

    Fix BZ #16634.

    An application that erroneously tries to repeatedly dlopen("a.out", ...)
    may hit assertion failure:

      Inconsistency detected by ld.so: dl-tls.c: 474: _dl_allocate_tls_init:
      Assertion `listp != ((void *)0)' failed!

    dlopen() actually fails with  "./a.out: cannot dynamically load
executable",
    but it does so after incrementing dl_tls_max_dtv_idx.

    Once we run out of TLS_SLOTINFO_SURPLUS (62), we exit with above assertion
    failure.

    2014-03-24  Paul Pluzhnikov  <ppluzhnikov@google.com>

        [BZ #16634]

        * elf/dl-load.c (open_verify): Add mode parameter.
            Error early when ET_EXEC and mode does not have __RTLD_OPENEXEC.
            (open_path): Change from boolean 'secure' to complete flag 'mode'
            (_dl_map_object): Adjust.
        * elf/Makefile (tests): Add tst-dlopen-aout.
        * elf/tst-dlopen-aout.c: New test.

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

Summary of changes:
 ChangeLog                                     |   11 ++++
 NEWS                                          |    6 +-
 elf/Makefile                                  |    3 +-
 elf/dl-load.c                                 |   36 +++++++++-----
 libio/test-freopen.c => elf/tst-dlopen-aout.c |   63 +++++++++++++-----------
 5 files changed, 74 insertions(+), 45 deletions(-)
 copy libio/test-freopen.c => elf/tst-dlopen-aout.c (51%)

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