[Bug nptl/17628] New: nptl_db's td_thr_tls* don't check DTV generation

[Bug nptl/17628] New: nptl_db's td_thr_tls* don't check DTV generation

[aoliva at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17628

            Bug ID: 17628
           Summary: nptl_db's td_thr_tls* don't check DTV generation
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: aoliva at sourceware dot org
          Reporter: aoliva at sourceware dot org
                CC: drepper.fsp at gmail dot com

td_thr_tlsbase and td_thr_tls_get_addr may return garbage because they fail to
check that the DTV entry refers to the named module, because they don't check
the DTV was updated so as to release earlier uses of the same modid.

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[Bug nptl/17628] nptl_db's td_thr_tls* don't check DTV generation

[aoliva at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17628

Alexandre Oliva <aoliva at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #1 from Alexandre Oliva <aoliva at sourceware dot org> ---
Mine

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[Bug nptl/17628] nptl_db's td_thr_tls* don't check DTV generation

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17628

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".

The branch, master has been updated
       via  f8aeae347377f3dfa8cbadde057adf1827fb1d44 (commit)
      from  b97eb2bdb1ed72982a7821c3078be591051cef59 (commit)

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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f8aeae347377f3dfa8cbadde057adf1827fb1d44

commit f8aeae347377f3dfa8cbadde057adf1827fb1d44
Author: Alexandre Oliva <aoliva@redhat.com>
Date:   Tue Mar 17 01:14:11 2015 -0300

    Fix DTV race, assert, DTV_SURPLUS Static TLS limit, and nptl_db garbage

    for  ChangeLog

        [BZ #17090]
        [BZ #17620]
        [BZ #17621]
        [BZ #17628]
        * NEWS: Update.
        * elf/dl-tls.c (_dl_update_slotinfo): Clean up outdated DTV
        entries with Static TLS too.  Skip entries past the end of the
        allocated DTV, from Alan Modra.
        (tls_get_addr_tail): Update to glibc_likely/unlikely.  Move
        Static TLS DTV entry set up from...
         (_dl_allocate_tls_init): ... here (fix modid assertion), ...
        * elf/dl-reloc.c (_dl_nothread_init_static_tls): ... here...
        * nptl/allocatestack.c (init_one_static_tls): ... and here...
        * elf/dlopen.c (dl_open_worker): Drop l_tls_modid upper bound
        for Static TLS.
        * elf/tlsdeschtab.h (map_generation): Return size_t.  Check
        that the slot we find is associated with the given map before
        using its generation count.
        * nptl_db/db_info.c: Include ldsodefs.h.
        (rtld_global, dtv_slotinfo_list, dtv_slotinfo): New typedefs.
        * nptl_db/structs.def (DB_RTLD_VARIABLE): New macro.
        (DB_MAIN_VARIABLE, DB_RTLD_GLOBAL_FIELD): Likewise.
        (link_map::l_tls_offset): New struct field.
        (dtv_t::counter): Likewise.
        (rtld_global): New struct.
        (_rtld_global): New rtld variable.
        (dl_tls_dtv_slotinfo_list): New rtld global field.
        (dtv_slotinfo_list): New struct.
        (dtv_slotinfo): Likewise.
        * nptl_db/td_symbol_list.c: Drop gnu/lib-names.h include.
        (td_lookup): Rename to...
        (td_mod_lookup): ... this.  Use new mod parameter instead of
        LIBPTHREAD_SO.
        * nptl_db/td_thr_tlsbase.c: Include link.h.
        (dtv_slotinfo_list, dtv_slotinfo): New functions.
        (td_thr_tlsbase): Check DTV generation.  Compute Static TLS
        addresses even if the DTV is out of date or missing them.
        * nptl_db/fetch-value.c (_td_locate_field): Do not refuse to
        index zero-length arrays.
        * nptl_db/thread_dbP.h: Include gnu/lib-names.h.
        (td_lookup): Make it a macro implemented in terms of...
        (td_mod_lookup): ... this declaration.
        * nptl_db/db-symbols.awk (DB_RTLD_VARIABLE): Override.
        (DB_MAIN_VARIABLE): Likewise.

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

Summary of changes:
 ChangeLog                |   47 +++++++++++++
 NEWS                     |   11 ++--
 elf/dl-open.c            |   12 +---
 elf/dl-reloc.c           |    6 --
 elf/dl-tls.c             |   63 +++++++++--------
 elf/tlsdeschtab.h        |    4 +-
 nptl/allocatestack.c     |    9 +--
 nptl_db/db-symbols.awk   |    2 +
 nptl_db/db_info.c        |    4 +
 nptl_db/fetch-value.c    |    3 +-
 nptl_db/structs.def      |   39 +++++++++++
 nptl_db/td_symbol_list.c |    7 +-
 nptl_db/td_thr_tlsbase.c |  172 +++++++++++++++++++++++++++++++++++++++++++++-
 nptl_db/thread_dbP.h     |   11 ++--
 14 files changed, 317 insertions(+), 73 deletions(-)

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[Bug nptl/17628] nptl_db's td_thr_tls* don't check DTV generation

[aoliva at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17628

Alexandre Oliva <aoliva at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Alexandre Oliva <aoliva at sourceware dot org> ---
Fixed

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[Bug nptl/17628] nptl_db's td_thr_tls* don't check DTV generation

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17628

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |18457


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=18457
[Bug 18457] pthread_join deadlock in library destructor
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[Bug nptl/17628] nptl_db's td_thr_tls* don't check DTV generation

[siddhesh at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17628
Bug 17628 depends on bug 18457, which changed state.

Bug 18457 Summary: pthread_join deadlock in library destructor
https://sourceware.org/bugzilla/show_bug.cgi?id=18457

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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