coreutils/coreutils-date-avoid-crash-in-TZ-parsing.patch

Port upstream fix for date(1), to be removed with v8.23:

  date could crash or go into an infinite loop when parsing a malformed TZ="".
  [bug introduced with the --date='TZ="" ..' parsing feature in coreutils-5.3.0]

This patch consists of 2 upstream commits:

  http://git.sv.gnu.org/cgit/gnulib.git/commit/?id=a10acfb1d2
  http://git.sv.gnu.org/cgit/coreutils.git/commit/?id=a4faa6a0a3

While the former commit in gnulib actually fixes the issue (and adds a test
there), the latter commit in upstream coreutils pulls in that change from
gnulib and adds a test for the previously crashing date(1) command.

-----------------------------------------------
commit a10acfb1d2118f9a180181d3fed5399dbbe1df3c
Author: Pádraig Brady <P@draigBrady.com>
Date:   Tue Feb 25 10:58:48 2014 +0000

    parse-datetime: fix crash or infloop in TZ="" parsing
    
    This was reported in http://bugs.gnu.org/16872
    from the coreutils command: date -d 'TZ="""'
    
    The infinite loop for this case was present since the
    initial TZ="" parsing support in commit de95bdc2 29-10-2004.
    This was changed to a crash or heap corruption depending
    on the platform with commit 2e3e4195 18-01-2010.
    
    * lib/parse-datetime.y (parse_datetime): Break out of the
    TZ="" parsing loop once the second significant " is found.
    Also skip over any subsequent whitespace to be consistent
    with the non TZ= case.
    * tests/test-parse-datetime.c: Add test cases for TZ="" parsing.

Omit the NEWS entry from the original patch.

-----------------------------------------------
commit a4faa6a0a3ae93c01d036d830ae7a21b74913baf
Author: Pádraig Brady <P@draigBrady.com>
Date:   Thu Feb 27 23:43:34 2014 +0000

    date: fix crash or infinite loop when parsing a malformed TZ=""
    
    * gnulib: Update to incorporate the fix.
    This is the only change in this gnulib update.
    * tests/misc/date.pl: Add a test for this case.
    
    Fixes http://bugs.gnu.org/16872

Omit the NEWS entry from the original patch.
---
 gnulib-tests/test-parse-datetime.c |   16 ++++++++++++++++
 lib/parse-datetime.c               |    7 +++++--
 lib/parse-datetime.y               |    7 +++++--
 tests/misc/date.pl                 |    7 +++++++
 4 files changed, 33 insertions(+), 4 deletions(-)

Index: lib/parse-datetime.y
===================================================================
--- lib/parse-datetime.y.orig
+++ lib/parse-datetime.y
@@ -1303,8 +1303,6 @@ parse_datetime (struct timespec *result,
             char tz1buf[TZBUFSIZE];
             bool large_tz = TZBUFSIZE < tzsize;
             bool setenv_ok;
-            /* Free tz0, in case this is the 2nd or subsequent time through. */
-            free (tz0);
             tz0 = get_tz (tz0buf);
             z = tz1 = large_tz ? xmalloc (tzsize) : tz1buf;
             for (s = tzbase; *s != '"'; s++)
@@ -1316,7 +1314,12 @@ parse_datetime (struct timespec *result,
             if (!setenv_ok)
               goto fail;
             tz_was_altered = true;
+
             p = s + 1;
+            while (c = *p, c_isspace (c))
+              p++;
+
+            break;
           }
     }
 
Index: lib/parse-datetime.c
===================================================================
--- lib/parse-datetime.c.orig
+++ lib/parse-datetime.c
@@ -3207,8 +3207,6 @@ parse_datetime (struct timespec *result,
             char tz1buf[TZBUFSIZE];
             bool large_tz = TZBUFSIZE < tzsize;
             bool setenv_ok;
-            /* Free tz0, in case this is the 2nd or subsequent time through. */
-            free (tz0);
             tz0 = get_tz (tz0buf);
             z = tz1 = large_tz ? xmalloc (tzsize) : tz1buf;
             for (s = tzbase; *s != '"'; s++)
@@ -3220,7 +3218,12 @@ parse_datetime (struct timespec *result,
             if (!setenv_ok)
               goto fail;
             tz_was_altered = true;
+
             p = s + 1;
+            while (c = *p, c_isspace (c))
+              p++;
+
+            break;
           }
     }
 
Index: tests/misc/date.pl
===================================================================
--- tests/misc/date.pl.orig
+++ tests/misc/date.pl
@@ -287,6 +287,13 @@ my @Tests =
       {ERR => "date: invalid date '\\260'\n"},
       {EXIT => 1},
      ],
+
+     # From coreutils-5.3.0 to 8.22 inclusive
+     # this would either infinite loop or crash
+     ['invalid-TZ-crash', "-d 'TZ=\"\"\"'",
+      {ERR => "date: invalid date 'TZ=\"\"\"'\n"},
+      {EXIT => 1},
+     ],
     );
 
 # Repeat the cross-dst test, using Jan 1, 2005 and every interval from 1..364.
Index: gnulib-tests/test-parse-datetime.c
===================================================================
--- gnulib-tests/test-parse-datetime.c.orig
+++ gnulib-tests/test-parse-datetime.c
@@ -419,5 +419,21 @@ main (int argc _GL_UNUSED, char **argv)
      starting with a high-bit-set byte would be treated like "0".  */
   ASSERT ( ! parse_datetime (&result, "\xb0", &now));
 
+  /* Exercise TZ="" parsing code.  */
+  /* These two would infloop or segfault before Feb 2014.  */
+  ASSERT ( ! parse_datetime (&result, "TZ=\"\"\"", &now));
+  ASSERT ( ! parse_datetime (&result, "TZ=\"\" \"", &now));
+  /* Exercise invalid patterns.  */
+  ASSERT ( ! parse_datetime (&result, "TZ=\"", &now));
+  ASSERT ( ! parse_datetime (&result, "TZ=\"\\\"", &now));
+  ASSERT ( ! parse_datetime (&result, "TZ=\"\\n", &now));
+  ASSERT ( ! parse_datetime (&result, "TZ=\"\\n\"", &now));
+  /* Exercise valid patterns.  */
+  ASSERT (   parse_datetime (&result, "TZ=\"\"", &now));
+  ASSERT (   parse_datetime (&result, "TZ=\"\" ", &now));
+  ASSERT (   parse_datetime (&result, " TZ=\"\"", &now));
+  ASSERT (   parse_datetime (&result, "TZ=\"\\\\\"", &now));
+  ASSERT (   parse_datetime (&result, "TZ=\"\\\"\"", &now));
+
   return 0;
 }