[Bug libc/20248] debug/tst-longjump_chk2 calls printf from a signal handler

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https://sourceware.org/bugzilla/show_bug.cgi?id=20248

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2c41b52901331f5c761015af786a3976e225d779

commit 2c41b52901331f5c761015af786a3976e225d779
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Jun 13 13:08:39 2016 +0200

    debug/tst-longjmp_chk2: Make signal handler more conservative [BZ #20248]

    Currently, printf needs more stack space than what is available with
    SIGSTKSZ.  This commit use the the write system call directly instead.

    Also use sig_atomic_t for the âpassâ variable (for general
    correctness), and restore signal handlers to their defaults, to avoid
    masking crashes.

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

Summary of changes:
 ChangeLog                |    9 +++++++++
 debug/tst-longjmp_chk2.c |   23 ++++++++++++++++++-----
 2 files changed, 27 insertions(+), 5 deletions(-)

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