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[Bug nptl/19861] libpthread IFUNC resolver for fork can lead to crash


https://sourceware.org/bugzilla/show_bug.cgi?id=19861

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=71170eba2af41e08d51cf9d7b1ded5fd4b0b5c9c

commit 71170eba2af41e08d51cf9d7b1ded5fd4b0b5c9c
Author: Andreas Schwab <schwab@suse.de>
Date:   Tue Aug 8 17:44:32 2017 +0200

    Add test for bug 21041

    (cherry picked from commit 40c06a3d0450365e9675fe26f34fc56ce8497325)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4db8f362c13c7239311db95bd7f96d4bce0769f3

commit 4db8f362c13c7239311db95bd7f96d4bce0769f3
Author: Andreas Schwab <schwab@suse.de>
Date:   Wed Aug 9 10:36:08 2017 +0200

    Fix s390 version of pt-longjmp.c

    (cherry picked from commit 5797b410a87f6f6f6d3661d730fac320cbd5f270)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=88758c4ad3f046d050bc2c3ae0f172b6524ca6c2

commit 88758c4ad3f046d050bc2c3ae0f172b6524ca6c2
Author: Andreas Schwab <schwab@suse.de>
Date:   Tue Aug 8 16:21:58 2017 +0200

    Don't use IFUNC resolver for longjmp or system in libpthread (bug 21041)

    Unlike the vfork forwarder and like the fork forwarder as in bug 19861,
    there won't be a problem when the compiler does not turn this into a tail
    call.

    (cherry picked from commit fc5ad7024c620cdfe9b76e94638aac83b99c5bf8)

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

Summary of changes:
 ChangeLog                                          |   21 +++++++++++++
 nptl/Makefile                                      |    6 ++-
 nptl/pt-longjmp.c                                  |   31 ++++++-------------
 nptl/pt-system.c                                   |   24 +++++----------
 .../lcong48.c => nptl/tst-compat-forwarder-mod.c   |   10 ++++--
 .../tst-compat-forwarder.c                         |   23 ++++++--------
 sysdeps/unix/sysv/linux/s390/pt-longjmp.c          |    4 +-
 7 files changed, 61 insertions(+), 58 deletions(-)
 copy stdlib/lcong48.c => nptl/tst-compat-forwarder-mod.c (77%)
 copy math/test-fe-snans-always-signal.c => nptl/tst-compat-forwarder.c (67%)

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