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Merge branch 'timegm_overflow_squashed'

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This commit is contained in:
Nick Mathewson 2016-03-24 10:18:00 -04:00
commit 6256c61d95
3 changed files with 133 additions and 4 deletions
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5
changes/bug18479 Normal file
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@ -0,0 +1,5 @@
o Minor bugfixes (time parsing):
- Avoid overflow in tor_timegm when parsing dates in and after 2038
on platforms with 32-bit time_t.
Fixes bug 18479; bugfix on 3c4b4c8ca in tor-0.0.2pre14.
Patch by "teor".

23
src/common/util.c
View File

@ -1475,9 +1475,19 @@ tor_timegm(const struct tm *tm, time_t *time_out)
{
/* This is a pretty ironclad timegm implementation, snarfed from Python2.2.
* It's way more brute-force than fiddling with tzset().
*/
time_t year, days, hours, minutes, seconds;
*
* We use int64_t rather than time_t to avoid overflow on multiplication on
* platforms with 32-bit time_t. Since year is clipped to INT32_MAX, and
* since 365 * 24 * 60 * 60 is approximately 31 million, it's not possible
* for INT32_MAX years to overflow int64_t when converted to seconds. */
int64_t year, days, hours, minutes, seconds;
int i, invalid_year, dpm;
/* Initialize time_out to 0 for now, to avoid bad usage in case this function
fails and the caller ignores the return value. */
tor_assert(time_out);
*time_out = 0;
/* avoid int overflow on addition */
if (tm->tm_year < INT32_MAX-1900) {
year = tm->tm_year + 1900;
@ -1516,7 +1526,14 @@ tor_timegm(const struct tm *tm, time_t *time_out)
minutes = hours*60 + tm->tm_min;
seconds = minutes*60 + tm->tm_sec;
*time_out = seconds;
/* Check that "seconds" will fit in a time_t. On platforms where time_t is
* 32-bit, this check will fail for dates in and after 2038.
* "seconds" can't be negative, because "year" >= 1970. */
if (seconds < TIME_MIN || seconds > TIME_MAX) {
log_warn(LD_BUG, "Result does not fit in tor_timegm");
return -1;
}
*time_out = (time_t)seconds;
return 0;
}

109
src/test/test_util.c
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@ -328,6 +328,25 @@ test_util_time(void *arg)
tor_gmtime_r(&t_res, &b_time);
TM_EQUAL(a_time, b_time);
/* This value is in range with 32 bit and 64 bit time_t */
a_time.tm_year = 2037-1900;
t_res = 2115180895UL;
tt_int_op(t_res, OP_EQ, tor_timegm(&a_time));
tor_gmtime_r(&t_res, &b_time);
TM_EQUAL(a_time, b_time);
/* This value is out of range with 32 bit time_t, but in range for 64 bit
* time_t */
a_time.tm_year = 2039-1900;
#if SIZEOF_TIME_T == 4
tt_int_op((time_t) -1,OP_EQ, tor_timegm(&a_time));
#elif SIZEOF_TIME_T == 8
t_res = 2178252895UL;
tt_int_op(t_res, OP_EQ, tor_timegm(&a_time));
tor_gmtime_r(&t_res, &b_time);
TM_EQUAL(a_time, b_time);
#endif
/* Test tor_timegm out of range */
/* year */
@ -548,6 +567,37 @@ test_util_time(void *arg)
i = parse_rfc1123_time(timestr, &t_res);
tt_int_op(0,OP_EQ, i);
tt_int_op(t_res,OP_EQ, (time_t)1091580502UL);
/* This value is in range with 32 bit and 64 bit time_t */
format_rfc1123_time(timestr, (time_t)2080000000UL);
tt_str_op("Fri, 30 Nov 2035 01:46:40 GMT",OP_EQ, timestr);
t_res = 0;
i = parse_rfc1123_time(timestr, &t_res);
tt_int_op(0,OP_EQ, i);
tt_int_op(t_res,OP_EQ, (time_t)2080000000UL);
/* This value is out of range with 32 bit time_t, but in range for 64 bit
* time_t */
format_rfc1123_time(timestr, (time_t)2150000000UL);
#if SIZEOF_TIME_T == 4
/* format_rfc1123_time should indicate failure on overflow, but it doesn't
* yet. Hopefully #18480 will improve the failure semantics in this case.
tt_str_op("Wed, 17 Feb 2038 06:13:20 GMT",OP_EQ, timestr);
*/
t_res = 0;
i = parse_rfc1123_time(timestr, &t_res);
tt_int_op(-1,OP_EQ, i);
#elif SIZEOF_TIME_T == 8
tt_str_op("Wed, 17 Feb 2038 06:13:20 GMT",OP_EQ, timestr);
t_res = 0;
i = parse_rfc1123_time(timestr, &t_res);
tt_int_op(0,OP_EQ, i);
tt_int_op(t_res,OP_EQ, (time_t)2150000000UL);
#endif
/* The timezone doesn't matter */
t_res = 0;
tt_int_op(0,OP_EQ,
@ -595,6 +645,24 @@ test_util_time(void *arg)
i = parse_iso_time("2004-8-4 0:48:22", &t_res);
tt_int_op(0,OP_EQ, i);
tt_int_op(t_res,OP_EQ, (time_t)1091580502UL);
/* This value is in range with 32 bit and 64 bit time_t */
t_res = 0;
i = parse_iso_time("2035-11-30 01:46:40", &t_res);
tt_int_op(0,OP_EQ, i);
tt_int_op(t_res,OP_EQ, (time_t)2080000000UL);
/* This value is out of range with 32 bit time_t, but in range for 64 bit
* time_t */
t_res = 0;
i = parse_iso_time("2038-02-17 06:13:20", &t_res);
#if SIZEOF_TIME_T == 4
tt_int_op(-1,OP_EQ, i);
#elif SIZEOF_TIME_T == 8
tt_int_op(0,OP_EQ, i);
tt_int_op(t_res,OP_EQ, (time_t)2150000000UL);
#endif
tt_int_op(-1,OP_EQ, parse_iso_time("2004-08-zz 99-99x99", &t_res));
tt_int_op(-1,OP_EQ, parse_iso_time("2011-03-32 00:00:00", &t_res));
tt_int_op(-1,OP_EQ, parse_iso_time("2011-03-30 24:00:00", &t_res));
@ -622,7 +690,7 @@ test_util_time(void *arg)
/* Test format_iso_time */
tv.tv_sec = (time_t)1326296338;
tv.tv_sec = (time_t)1326296338UL;
tv.tv_usec = 3060;
format_iso_time(timestr, (time_t)tv.tv_sec);
tt_str_op("2012-01-11 15:38:58",OP_EQ, timestr);
@ -639,6 +707,25 @@ test_util_time(void *arg)
tt_str_op("2012-01-11T15:38:58.003060",OP_EQ, timestr);
tt_int_op(strlen(timestr),OP_EQ, ISO_TIME_USEC_LEN);
tv.tv_usec = 0;
/* This value is in range with 32 bit and 64 bit time_t */
tv.tv_sec = (time_t)2080000000UL;
format_iso_time(timestr, (time_t)tv.tv_sec);
tt_str_op("2035-11-30 01:46:40",OP_EQ, timestr);
/* This value is out of range with 32 bit time_t, but in range for 64 bit
* time_t */
tv.tv_sec = (time_t)2150000000UL;
format_iso_time(timestr, (time_t)tv.tv_sec);
#if SIZEOF_TIME_T == 4
/* format_iso_time should indicate failure on overflow, but it doesn't yet.
* Hopefully #18480 will improve the failure semantics in this case.
tt_str_op("2038-02-17 06:13:20",OP_EQ, timestr);
*/
#elif SIZEOF_TIME_T == 8
tt_str_op("2038-02-17 06:13:20",OP_EQ, timestr);
#endif
done:
;
}
@ -712,6 +799,26 @@ test_util_parse_http_time(void *arg)
tt_int_op(0,OP_EQ,parse_http_time("Mon, 31 Dec 2012 00:00:00 GMT", &a_time));
tt_int_op((time_t)1356912000UL,OP_EQ, tor_timegm(&a_time));
T("2012-12-31 00:00:00");
/* This value is in range with 32 bit and 64 bit time_t */
tt_int_op(0,OP_EQ,parse_http_time("Fri, 30 Nov 2035 01:46:40 GMT", &a_time));
tt_int_op((time_t)2080000000UL,OP_EQ, tor_timegm(&a_time));
T("2035-11-30 01:46:40");
/* This value is out of range with 32 bit time_t, but in range for 64 bit
* time_t */
#if SIZEOF_TIME_T == 4
/* parse_http_time should indicate failure on overflow, but it doesn't yet.
* Hopefully #18480 will improve the failure semantics in this case. */
tt_int_op(0,OP_EQ,parse_http_time("Wed, 17 Feb 2038 06:13:20 GMT", &a_time));
tt_int_op((time_t)-1,OP_EQ, tor_timegm(&a_time));
#elif SIZEOF_TIME_T == 8
tt_int_op(0,OP_EQ,parse_http_time("Wed, 17 Feb 2038 06:13:20 GMT", &a_time));
tt_int_op((time_t)2150000000UL,OP_EQ, tor_timegm(&a_time));
T("2038-02-17 06:13:20");
#endif
tt_int_op(-1,OP_EQ, parse_http_time("2004-08-zz 99-99x99 GMT", &a_time));
tt_int_op(-1,OP_EQ, parse_http_time("2011-03-32 00:00:00 GMT", &a_time));
tt_int_op(-1,OP_EQ, parse_http_time("2011-03-30 24:00:00 GMT", &a_time));