gnu: python2: Add upstream security fixes.

This addresses CVE-2018-{1060,1061,14647,1000802}.

* gnu/packages/patches/python2-CVE-2018-1000802.patch,
gnu/packages/patches/python2-CVE-2018-1060.patch,
gnu/packages/patches/python2-CVE-2018-1061.patch,
gnu/packages/patches/python2-CVE-2018-14647.patch: New files.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/python.scm (python-2/fixed): New variable.
(python-2.7)[replacement]: New field.
(python2-minimal): Use PACKAGE/INHERIT.

gnu/local.mk

@@ -1068,6 +1068,10 @@ dist_patch_DATA =						\
   %D%/packages/patches/pygpgme-disable-problematic-tests.patch  \
   %D%/packages/patches/pyqt-configure.patch			\
   %D%/packages/patches/pyqt-public-sip.patch			\
+  %D%/packages/patches/python2-CVE-2018-1060.patch		\
+  %D%/packages/patches/python2-CVE-2018-1061.patch		\
+  %D%/packages/patches/python2-CVE-2018-14647.patch		\
+  %D%/packages/patches/python2-CVE-2018-1000802.patch		\
   %D%/packages/patches/python-2-deterministic-build-info.patch	\
   %D%/packages/patches/python-2.7-adjust-tests.patch		\
   %D%/packages/patches/python-2.7-search-paths.patch		\

gnu/packages/patches/python2-CVE-2018-1000802.patch

@@ -0,0 +1,47 @@
+Fix CVE-2018-1000802:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000802
+
+Taken from upstream commit (sans NEWS):
+https://github.com/python/cpython/commit/d8b103b8b3ef9644805341216963a64098642435
+
+diff --git a/Lib/shutil.py b/Lib/shutil.py
+index 3462f7c5e9..0ab1a06f52 100644
+--- a/Lib/shutil.py
++++ b/Lib/shutil.py
+@@ -413,17 +413,21 @@ def _make_tarball(base_name, base_dir, compress="gzip", verbose=0, dry_run=0,
+ 
+     return archive_name
+ 
+-def _call_external_zip(base_dir, zip_filename, verbose=False, dry_run=False):
++def _call_external_zip(base_dir, zip_filename, verbose, dry_run, logger):
+     # XXX see if we want to keep an external call here
+     if verbose:
+         zipoptions = "-r"
+     else:
+         zipoptions = "-rq"
+-    from distutils.errors import DistutilsExecError
+-    from distutils.spawn import spawn
++    cmd = ["zip", zipoptions, zip_filename, base_dir]
++    if logger is not None:
++        logger.info(' '.join(cmd))
++    if dry_run:
++        return
++    import subprocess
+     try:
+-        spawn(["zip", zipoptions, zip_filename, base_dir], dry_run=dry_run)
+-    except DistutilsExecError:
++        subprocess.check_call(cmd)
++    except subprocess.CalledProcessError:
+         # XXX really should distinguish between "couldn't find
+         # external 'zip' command" and "zip failed".
+         raise ExecError, \
+@@ -458,7 +462,7 @@ def _make_zipfile(base_name, base_dir, verbose=0, dry_run=0, logger=None):
+         zipfile = None
+ 
+     if zipfile is None:
+-        _call_external_zip(base_dir, zip_filename, verbose, dry_run)
++        _call_external_zip(base_dir, zip_filename, verbose, dry_run, logger)
+     else:
+         if logger is not None:
+             logger.info("creating '%s' and adding '%s' to it",

gnu/packages/patches/python2-CVE-2018-1060.patch

@@ -0,0 +1,20 @@
+Fix CVE-2018-1060:
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1060
+
+Taken from upstream commit (sans test and NEWS):
+https://github.com/python/cpython/commit/e052d40cea15f582b50947f7d906b39744dc62a2
+
+diff --git a/Lib/poplib.py b/Lib/poplib.py
+index b91e5f72d2ca..a238510b38fc 100644
+--- a/Lib/poplib.py
++++ b/Lib/poplib.py
+@@ -274,7 +274,7 @@ def rpop(self, user):
+         return self._shortcmd('RPOP %s' % user)
+ 
+ 
+-    timestamp = re.compile(r'\+OK.*(<[^>]+>)')
++    timestamp = re.compile(br'\+OK.[^<]*(<.*>)')
+ 
+     def apop(self, user, secret):
+         """Authorisation
+

gnu/packages/patches/python2-CVE-2018-1061.patch

@@ -0,0 +1,20 @@
+Fix CVE-2018-1061:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1061
+
+Taken from upstream commit (sans test and NEWS):
+https://github.com/python/cpython/commit/e052d40cea15f582b50947f7d906b39744dc62a2
+
+diff --git a/Lib/difflib.py b/Lib/difflib.py
+index 1c6fbdbedcb7..788a92df3f89 100644
+--- a/Lib/difflib.py
++++ b/Lib/difflib.py
+@@ -1103,7 +1103,7 @@ def _qformat(self, aline, bline, atags, btags):
+ 
+ import re
+ 
+-def IS_LINE_JUNK(line, pat=re.compile(r"\s*#?\s*$").match):
++def IS_LINE_JUNK(line, pat=re.compile(r"\s*(?:#\s*)?$").match):
+     r"""
+     Return 1 for ignorable line: iff `line` is blank or contains a single '#'.
+

gnu/packages/patches/python2-CVE-2018-14647.patch

@@ -0,0 +1,61 @@
+Fix CVE-2018-14647:
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14647
+https://bugs.python.org/issue34623
+
+Taken from upstream:
+https://github.com/python/cpython/commit/18b20bad75b4ff0486940fba4ec680e96e70f3a2
+
+diff --git a/Include/pyexpat.h b/Include/pyexpat.h
+index 5340ef5fa3..3fc5fa54da 100644
+--- a/Include/pyexpat.h
++++ b/Include/pyexpat.h
+@@ -3,7 +3,7 @@
+ 
+ /* note: you must import expat.h before importing this module! */
+ 
+-#define PyExpat_CAPI_MAGIC  "pyexpat.expat_CAPI 1.0"
++#define PyExpat_CAPI_MAGIC  "pyexpat.expat_CAPI 1.1"
+ #define PyExpat_CAPSULE_NAME "pyexpat.expat_CAPI"
+ 
+ struct PyExpat_CAPI 
+@@ -43,6 +43,8 @@ struct PyExpat_CAPI
+         XML_Parser parser, XML_UnknownEncodingHandler handler,
+         void *encodingHandlerData);
+     void (*SetUserData)(XML_Parser parser, void *userData);
++    /* might be none for expat < 2.1.0 */
++    int (*SetHashSalt)(XML_Parser parser, unsigned long hash_salt);
+     /* always add new stuff to the end! */
+ };
+ 
+diff --git a/Modules/_elementtree.c b/Modules/_elementtree.c
+index f7f992dd3a..b38e0ab329 100644
+--- a/Modules/_elementtree.c
++++ b/Modules/_elementtree.c
+@@ -2574,6 +2574,11 @@ xmlparser(PyObject* self_, PyObject* args, PyObject* kw)
+         PyErr_NoMemory();
+         return NULL;
+     }
++    /* expat < 2.1.0 has no XML_SetHashSalt() */
++    if (EXPAT(SetHashSalt) != NULL) {
++        EXPAT(SetHashSalt)(self->parser,
++                           (unsigned long)_Py_HashSecret.prefix);
++    }
+ 
+     ALLOC(sizeof(XMLParserObject), "create expatparser");
+ 
+diff --git a/Modules/pyexpat.c b/Modules/pyexpat.c
+index 2b4d31293c..1f8c0d70a5 100644
+--- a/Modules/pyexpat.c
++++ b/Modules/pyexpat.c
+@@ -2042,6 +2042,11 @@ MODULE_INITFUNC(void)
+     capi.SetProcessingInstructionHandler = XML_SetProcessingInstructionHandler;
+     capi.SetUnknownEncodingHandler = XML_SetUnknownEncodingHandler;
+     capi.SetUserData = XML_SetUserData;
++#if XML_COMBINED_VERSION >= 20100
++    capi.SetHashSalt = XML_SetHashSalt;
++#else
++    capi.SetHashSalt = NULL;
++#endif
+ 
+     /* export using capsule */
+     capi_object = PyCapsule_New(&capi, PyExpat_CAPSULE_NAME, NULL);

gnu/packages/python.scm

@@ -148,6 +148,7 @@ (define-public python-2.7
   (package
     (name "python2")
     (version "2.7.14")
+    (replacement python-2/fixed)
     (source
      (origin
       (method url-fetch)
@@ -344,6 +345,18 @@ (define-public python-2.7
 ;; Current 2.x version.
 (define-public python-2 python-2.7)
 
+(define python-2/fixed
+  (package
+    (inherit python-2)
+    (source (origin
+              (inherit (package-source python-2))
+              (patches (append
+                        (origin-patches (package-source python-2))
+                        (search-patches "python2-CVE-2018-1060.patch"
+                                        "python2-CVE-2018-1061.patch"
+                                        "python2-CVE-2018-14647.patch"
+                                        "python2-CVE-2018-1000802.patch")))))))
+
 (define-public python2-called-python
   ;; Both 2.x and 3.x used to be called "python".  In commit
   ;; a7714d42de2c3082f3609d1e63c83d703fb39cf9 (March 2018), we renamed the
@@ -482,7 +495,7 @@ (define-public python python-3)
 ;; Python (Tk -> libxcb -> Python.)
 
 (define-public python2-minimal
-  (package (inherit python-2)
+  (package/inherit python-2
     (name "python2-minimal")
     (outputs '("out"))