[Bug nptl/13347] Threaded setuid() can wrongly report success when failing to drop privileges

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

https://sourceware.org/bugzilla/show_bug.cgi?id=13347

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=13f7fe35ae2b0ea55dc4b9628763aafdc8bdc30c

commit 13f7fe35ae2b0ea55dc4b9628763aafdc8bdc30c
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Mar 24 15:24:02 2014 +0100

    Check for syscall error in the SETXID implementation in NPTL (bug 13347).

    At this point, we can only abort the process because we have already
    switched credentials on other threads.  Returning an error would still
    leave the process in an inconsistent state.

    The new xtest needs root privileges to run.

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

Summary of changes:
 ChangeLog          |    7 +++
 nptl/Makefile      |    3 +-
 nptl/nptl-init.c   |    9 +++-
 nptl/tst-setuid2.c |  145 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 161 insertions(+), 3 deletions(-)
 create mode 100644 nptl/tst-setuid2.c

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