[Bug dynamic-link/18676] RTLD_NODELETE on an already open DSO does not prevent unloading

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

https://sourceware.org/bugzilla/show_bug.cgi?id=18676

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       via  b632bdd3f7c0ba0c79f23f5e4404eebb87ebdaa8 (commit)
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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9ceb5f6251fa0c0de5304e081e979b3f855148ed

commit 9ceb5f6251fa0c0de5304e081e979b3f855148ed
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date:   Thu Jul 16 08:54:39 2015 +0530

    Whitespace fixup in cxa_thread_atexit_impl.c

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b632bdd3f7c0ba0c79f23f5e4404eebb87ebdaa8

commit b632bdd3f7c0ba0c79f23f5e4404eebb87ebdaa8
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date:   Thu Jul 16 08:53:28 2015 +0530

    Set NODELETE flag when opening already open objects with RTLD_NODELETE

    The DF_1_NODELETE flag is set too late when opening a DSO, due to
    which, if a DSO is already open, subsequently opening it with
    RTLD_NODELETE fails to set the DF_1_NODELETE flag.  This patch fixes
    this by setting the flag immediately after bumping the opencount.

    Verified on x86_64.

        [BZ #18676]
        * elf/tst-nodelete-opened.c: New test case.
        * elf/tst-nodelete-opened-lib.c: New test case module.
        * elf/Makefile (tests, modules-names): Use them.
        * elf/dl-open.c (dl_open_worker): Set DF_1_NODELETE flag
        early.

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

Summary of changes:
 ChangeLog                                          |   11 +++++
 NEWS                                               |    2 +-
 elf/Makefile                                       |    6 ++-
 elf/dl-open.c                                      |   11 +++--
 .../stpcpy.S => elf/tst-nodelete-opened-lib.c      |    5 +-
 .../tst-nodelete-opened.c                          |   47 +++++++++++--------
 stdlib/cxa_thread_atexit_impl.c                    |    2 +-
 7 files changed, 52 insertions(+), 32 deletions(-)
 copy sysdeps/aarch64/stpcpy.S => elf/tst-nodelete-opened-lib.c (89%)
 copy nptl/tst-pthread-mutexattr.c => elf/tst-nodelete-opened.c (56%)

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