diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py index d65186db0ce..7feabced94a 100644 --- a/Lib/test/datetimetester.py +++ b/Lib/test/datetimetester.py @@ -1989,6 +1989,42 @@ class TestDateTime(TestDate): self.assertEqual(t.second, 0) self.assertEqual(t.microsecond, 7812) + def test_timestamp_limits(self): + # minimum timestamp + min_dt = self.theclass.min.replace(tzinfo=timezone.utc) + min_ts = min_dt.timestamp() + # date 0001-01-01 00:00:00+00:00: timestamp=-62135596800 + self.assertEqual(self.theclass.fromtimestamp(min_ts, tz=timezone.utc), + min_dt) + + # maximum timestamp: set seconds to zero to avoid rounding issues + max_dt = self.theclass.max.replace(tzinfo=timezone.utc, + second=0, microsecond=0) + max_ts = max_dt.timestamp() + # date 9999-12-31 23:59:00+00:00: timestamp 253402300740 + self.assertEqual(self.theclass.fromtimestamp(max_ts, tz=timezone.utc), + max_dt) + + # number of seconds greater than 1 year: make sure that the new date + # is not valid in datetime.datetime limits + delta = 3600 * 24 * 400 + + # too small + ts = min_ts - delta + # converting a Python int to C time_t can raise a OverflowError, + # especially on 32-bit platforms. + with self.assertRaises((ValueError, OverflowError)): + self.theclass.fromtimestamp(ts) + with self.assertRaises((ValueError, OverflowError)): + self.theclass.utcfromtimestamp(ts) + + # too big + ts = max_dt.timestamp() + delta + with self.assertRaises((ValueError, OverflowError)): + self.theclass.fromtimestamp(ts) + with self.assertRaises((ValueError, OverflowError)): + self.theclass.utcfromtimestamp(ts) + def test_insane_fromtimestamp(self): # It's possible that some platform maps time_t to double, # and that this test will fail there. This test should diff --git a/Misc/NEWS b/Misc/NEWS index dd6fcd0dcb7..5feaac7c387 100644 --- a/Misc/NEWS +++ b/Misc/NEWS @@ -225,6 +225,9 @@ Extension Modules Library ------- +- Issue #29100: Fix datetime.fromtimestamp() regression introduced in Python + 3.6.0: check minimum and maximum years. + - Issue #29416: Prevent infinite loop in pathlib.Path.mkdir - Issue #29444: Fixed out-of-bounds buffer access in the group() method of diff --git a/Modules/_datetimemodule.c b/Modules/_datetimemodule.c index 205b15bb182..1803d85a712 100644 --- a/Modules/_datetimemodule.c +++ b/Modules/_datetimemodule.c @@ -120,6 +120,8 @@ static PyTypeObject PyDateTime_TimeType; static PyTypeObject PyDateTime_TZInfoType; static PyTypeObject PyDateTime_TimeZoneType; +static int check_tzinfo_subclass(PyObject *p); + _Py_IDENTIFIER(as_integer_ratio); _Py_IDENTIFIER(fromutc); _Py_IDENTIFIER(isoformat); @@ -400,8 +402,7 @@ check_date_args(int year, int month, int day) { if (year < MINYEAR || year > MAXYEAR) { - PyErr_SetString(PyExc_ValueError, - "year is out of range"); + PyErr_Format(PyExc_ValueError, "year %i is out of range", year); return -1; } if (month < 1 || month > 12) { @@ -672,6 +673,10 @@ new_date_ex(int year, int month, int day, PyTypeObject *type) { PyDateTime_Date *self; + if (check_date_args(year, month, day) < 0) { + return NULL; + } + self = (PyDateTime_Date *) (type->tp_alloc(type, 0)); if (self != NULL) set_date_fields(self, year, month, day); @@ -689,6 +694,16 @@ new_datetime_ex2(int year, int month, int day, int hour, int minute, PyDateTime_DateTime *self; char aware = tzinfo != Py_None; + if (check_date_args(year, month, day) < 0) { + return NULL; + } + if (check_time_args(hour, minute, second, usecond, fold) < 0) { + return NULL; + } + if (check_tzinfo_subclass(tzinfo) < 0) { + return NULL; + } + self = (PyDateTime_DateTime *) (type->tp_alloc(type, aware)); if (self != NULL) { self->hastzinfo = aware; @@ -726,6 +741,13 @@ new_time_ex2(int hour, int minute, int second, int usecond, PyDateTime_Time *self; char aware = tzinfo != Py_None; + if (check_time_args(hour, minute, second, usecond, fold) < 0) { + return NULL; + } + if (check_tzinfo_subclass(tzinfo) < 0) { + return NULL; + } + self = (PyDateTime_Time *) (type->tp_alloc(type, aware)); if (self != NULL) { self->hastzinfo = aware; @@ -2511,8 +2533,6 @@ date_new(PyTypeObject *type, PyObject *args, PyObject *kw) if (PyArg_ParseTupleAndKeywords(args, kw, "iii", date_kws, &year, &month, &day)) { - if (check_date_args(year, month, day) < 0) - return NULL; self = new_date_ex(year, month, day, type); } return self; @@ -3598,10 +3618,6 @@ time_new(PyTypeObject *type, PyObject *args, PyObject *kw) if (PyArg_ParseTupleAndKeywords(args, kw, "|iiiiO$i", time_kws, &hour, &minute, &second, &usecond, &tzinfo, &fold)) { - if (check_time_args(hour, minute, second, usecond, fold) < 0) - return NULL; - if (check_tzinfo_subclass(tzinfo) < 0) - return NULL; self = new_time_ex2(hour, minute, second, usecond, tzinfo, fold, type); } @@ -4188,12 +4204,6 @@ datetime_new(PyTypeObject *type, PyObject *args, PyObject *kw) if (PyArg_ParseTupleAndKeywords(args, kw, "iii|iiiiO$i", datetime_kws, &year, &month, &day, &hour, &minute, &second, &usecond, &tzinfo, &fold)) { - if (check_date_args(year, month, day) < 0) - return NULL; - if (check_time_args(hour, minute, second, usecond, fold) < 0) - return NULL; - if (check_tzinfo_subclass(tzinfo) < 0) - return NULL; self = new_datetime_ex2(year, month, day, hour, minute, second, usecond, tzinfo, fold, type); @@ -4215,7 +4225,15 @@ static long long utc_to_seconds(int year, int month, int day, int hour, int minute, int second) { - long long ordinal = ymd_to_ord(year, month, day); + long long ordinal; + + /* ymd_to_ord() doesn't support year <= 0 */ + if (year < MINYEAR || year > MAXYEAR) { + PyErr_Format(PyExc_ValueError, "year %i is out of range", year); + return -1; + } + + ordinal = ymd_to_ord(year, month, day); return ((ordinal * 24 + hour) * 60 + minute) * 60 + second; } @@ -4231,7 +4249,6 @@ local(long long u) "timestamp out of range for platform time_t"); return -1; } - /* XXX: add bounds checking */ if (_PyTime_localtime(t, &local_time) != 0) return -1; return utc_to_seconds(local_time.tm_year + 1900, @@ -4269,6 +4286,7 @@ datetime_from_timet_and_us(PyObject *cls, TM_FUNC f, time_t timet, int us, */ second = Py_MIN(59, tm.tm_sec); + /* local timezone requires to compute fold */ if (tzinfo == Py_None && f == _PyTime_localtime) { long long probe_seconds, result_seconds, transition; @@ -4528,12 +4546,13 @@ add_datetime_timedelta(PyDateTime_DateTime *date, PyDateTime_Delta *delta, assert(factor == 1 || factor == -1); if (normalize_datetime(&year, &month, &day, - &hour, &minute, &second, µsecond) < 0) + &hour, &minute, &second, µsecond) < 0) { return NULL; - else - return new_datetime(year, month, day, - hour, minute, second, microsecond, - HASTZINFO(date) ? date->tzinfo : Py_None, 0); + } + + return new_datetime(year, month, day, + hour, minute, second, microsecond, + HASTZINFO(date) ? date->tzinfo : Py_None, 0); } static PyObject *