[Bug nptl/15368] raise() is not async-signal-safe

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https://sourceware.org/bugzilla/show_bug.cgi?id=15368

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2ac88eecc57ff00e0b5ff803ebcc3465d2d640dd

commit 2ac88eecc57ff00e0b5ff803ebcc3465d2d640dd
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Fri Apr 22 09:25:20 2016 -0300

    Refactor Linux raise implementation (BZ#15368)

    This patch changes both the nptl and libc Linux raise implementation
    to avoid the issues described in BZ#15368.  The strategy used is
    summarized in bug report first comment:

     1. Block all signals (including internal NPTL ones);
     2. Get pid and tid directly from syscall (not relying on cached
        values);
     3. Call tgkill;
     4. Restore old signal mask.

    Tested on x86_64 and i686.

        [BZ #15368]
        * sysdeps/unix/sysv/linux/nptl-signals.h
        (__nptl_clear_internal_signals): New function.
        (__libc_signal_block_all): Likewise.
        (__libc_signal_block_app): Likewise.
        (__libc_signal_restore_set): Likewise.
        * sysdeps/unix/sysv/linux/pt-raise.c (raise): Use Linux raise.c
        implementation.
        * sysdeps/unix/sysv/linux/raise.c (raise): Reimplement to not use
        the cached pid/tid value in pthread structure.

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

Summary of changes:
 ChangeLog                              |   13 +++++++
 sysdeps/unix/sysv/linux/nptl-signals.h |   41 +++++++++++++++++++++
 sysdeps/unix/sysv/linux/pt-raise.c     |   23 ++----------
 sysdeps/unix/sysv/linux/raise.c        |   63 +++++++++++++++++---------------
 4 files changed, 90 insertions(+), 50 deletions(-)

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