Merge with 3.2: Issue #12841: Fix tarfile extraction of non-existent uids/gids.

diff --cc Lib/tarfile.py
Simple merge

diff --cc Misc/NEWS
index b15876b1cfae72ef314a7b70a659d487606b3f9f,bd8c49788b305da73c1880036e48ea1dc8bb0965..16e0e40d0f745317ffbfc0f020d7dd9a8f0eedae
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -271,73 -73,66 +271,78 @@@ Core and Builtin
  Library
  -------
  
 -- Issue #10946: The distutils commands bdist_dumb, bdist_wininst and bdist_msi
 -  now respect a --skip-build option given to bdist.
+ - Issue #12841: tarfile unnecessarily checked the existence of numerical user
+   and group ids on extraction. If one of them did not exist the respective id
+   of the current user (i.e. root) was used for the file and ownership
+   information was lost.
+ 
 +- Issue #12888: Fix a bug in HTMLParser.unescape that prevented it to escape
 +  more than 128 entities.  Patch by Peter Otten.
  
 -- Issue #12839: Fix crash in zlib module due to version mismatch.
 -  Fix by Richard M. Tew.
 +- Issue #12878: Expose a __dict__ attribute on io.IOBase and its subclasses.
  
 -Extension Modules
 ------------------
 +- Issue #12636: IDLE reads the coding cookie when executing a Python script.
  
 -- Issue #9651: Fix a crash when ctypes.create_string_buffer(0) was passed to
 -  some functions like file.write().
 +- Issue #12494: On error, call(), check_call(), check_output() and
 +  getstatusoutput() functions of the subprocess module now kill the process,
 +  read its status (to avoid zombis) and close pipes.
  
 +- Issue #12720: Expose low-level Linux extended file attribute functions in os.
  
 +- Issue #10946: The distutils commands bdist_dumb, bdist_wininst and bdist_msi
 +  now respect a --skip-build option given to bdist.  The packaging commands
 +  were fixed too.
  
 -What's New in Python 3.2.2 release candidate 1?
 -===============================================
 +- Issue #12847: Fix a crash with negative PUT and LONG_BINPUT arguments in
 +  the C pickle implementation.
  
 -*Release date: 14-Aug-2011*
 +- Issue #11564: Avoid crashes when trying to pickle huge objects or containers
 +  (more than 2**31 items).  Instead, in most cases, an OverflowError is raised.
  
 -Core and Builtins
 ------------------
 +- Issue #12287: Fix a stack corruption in ossaudiodev module when the FD is
 +  greater than FD_SETSIZE.
  
 -- Issue #12732: In narrow unicode builds, allow Unicode identifiers which fall
 -  outside the BMP.
 +- Issue #12839: Fix crash in zlib module due to version mismatch.
 +  Fix by Richard M. Tew.
  
 -- Issue #11603: Fix a crash when __str__ is rebound as __repr__.  Patch by
 -  Andreas Stührk.
 +- Issue #9923: The mailcap module now correctly uses the platform path
 +  separator for the MAILCAP environment variable on non-POSIX platforms.
  
 -- Issue #11321: Fix a crash with multiple imports of the _pickle module when
 -  embedding Python.  Patch by Andreas Stührk.
 +- Issue #12835: Follow up to #6560 that unconditionally prevents use of the
 +  unencrypted sendmsg/recvmsg APIs on SSL wrapped sockets. Patch by David
 +  Watson.
  
 -- Verify the types of AST strings and identifiers provided by the user before
 -  compiling them.
 +- Issue #12803: SSLContext.load_cert_chain() now accepts a password argument
 +  to be used if the private key is encrypted.  Patch by Adam Simpkins.
  
 -- Issue #12579: str.format_map() now raises a ValueError if used on a
 -  format string that contains positional fields. Initial patch by
 -  Julian Berman.
 +- Issue #11657: Fix sending file descriptors over 255 over a multiprocessing
 +  Pipe.
  
 -- Issue #11627: Fix segfault when __new__ on a exception returns a
 -  non-exception class.
 +- Issue #12811: tabnanny.check() now promptly closes checked files. Patch by
 +  Anthony Briggs.
  
 -- Issue #12149: Update the method cache after a type's dictionary gets
 -  cleared by the garbage collector.  This fixes a segfault when an instance
 -  and its type get caught in a reference cycle, and the instance's
 -  deallocator calls one of the methods on the type (e.g. when subclassing
 -  IOBase).  Diagnosis and patch by Davide Rizzo.
 +- Issue #6560: The sendmsg/recvmsg API is now exposed by the socket module
 +  when provided by the underlying platform, supporting processing of
 +  ancillary data in pure Python code. Patch by David Watson and Heiko Wundram.
  
 -- When a generator yields, do not retain the caller's exception state on the
 -  generator.
 +- Issue #12326: On Linux, sys.platform doesn't contain the major version
 +  anymore. It is now always 'linux', instead of 'linux2' or 'linux3' depending
 +  on the Linux version used to build Python.
  
 -- Issue #12475: Prevent generators from leaking their exception state into the
 -  caller's frame as they return for the last time.
 +- Issue #12213: Fix a buffering bug with interleaved reads and writes that
 +  could appear on BufferedRandom streams.
  
 -Library
 --------
 +- Issue #12778: Reduce memory consumption when JSON-encoding a large
 +  container of many small objects.
 +
 +- Issue #12650: Fix a race condition where a subprocess.Popen could leak
 +  resources (FD/zombie) when killed at the wrong time.
 +
 +- Issue #12744: Fix inefficient representation of integers between 2**31 and
 +  2**63 on systems with a 64-bit C "long".
 +
 +- Issue #12646: Add an 'eof' attribute to zlib.Decompress, to make it easier to
 +  detect truncated input streams.
  
  - Issue #11513: Fix exception handling ``tarfile.TarFile.gzopen()`` when
    the file cannot be opened.