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fix: out-of-range double->int conversion in hdr_timespec_from_double (UBSan) #154

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Merged
fcostaoliveira merged 7 commits into from
Sep 30, 2026
Merged

fix: out-of-range double->int conversion in hdr_timespec_from_double (UBSan) #154

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d11cf03
fix: out-of-range double->int conversion in hdr_timespec_from_double …
fcostaoliveira Sep 14, 2026
f71d4ad
Merge branch 'main' into fix/timespec-from-double-overflow
fcostaoliveira Sep 15, 2026
113e566
fix: avoid int64_t->long narrowing warning on 32-bit long (MSVC C4244)
fcostaoliveira Sep 15, 2026
cce8c05
Merge branch 'main' into fix/timespec-from-double-overflow
fcostaoliveira Sep 18, 2026
49a4574
Merge remote-tracking branch 'upstream/main' into upd/154d
Sep 18, 2026
426f5ff
fix: use the destination seconds width on POSIX and Windows
fcostaoliveira Sep 29, 2026
a9d4fd2
Merge upstream/main into #154 (post #138/#149/#155/#157)
Sep 29, 2026
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23 changes: 20 additions & 3 deletions src/hdr_time.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
*/

#include <math.h>
#include <limits.h>

#include <hdr/hdr_time.h>

Expand Down Expand Up @@ -89,9 +90,25 @@ double hdr_timespec_as_double(const hdr_timespec* t)

void hdr_timespec_from_double(hdr_timespec* t, double value)
{
int seconds = (int) value;
int milliseconds = (int) round((value - seconds) * 1000);
/* Bound by the destination: time_t on POSIX, long on Windows/Cygwin. */
const double limit = ldexp(1.0, (int) (sizeof(t->tv_sec) * CHAR_BIT) - 1);
double seconds = trunc(value);
int milliseconds;

t->tv_sec = seconds;
/* converting a non-finite or out-of-range double to an integer is UB */
if (!isfinite(value) || seconds >= limit || seconds < -limit)
{
t->tv_sec = 0;
t->tv_nsec = 0;
Comment on lines +101 to +102

@paulorsousa paulorsousa Sep 29, 2026

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We're "silently" mapping invalid or out of range input values to zero (tbh, I'm not totally aware of the impact)
Maybe we could return an error instead and propagate it above (?)
The down-side is that the function returns void, so we'd need an API change, or a separate checked conversion function

@fcostaoliveira fcostaoliveira Sep 29, 2026

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Good question — I dug into this rather than hand-wave it. Recommendation: merge #154 as-is; keep the silent clamp, and add a checked variant only later as a separate, additive follow-up if a caller actually needs it.

Reasoning:

  1. Signature/ABI. hdr_timespec_from_double is a published void symbol in hdr/hdr_time.h. Changing it to return int is a source + ABI break that would force a SOVERSION bump — disproportionate for a UBSan fix and against the one-PR-one-purpose norm here.
  2. No caller can consume an error. The only in-tree caller is scan_start_time (src/hdr_histogram_log.c), which is itself void, and its parent header-scan chain propagates no per-field error. An absent StartTime already degrades to 0 via hdr_log_reader_init. So invalid input mapping to 0/0 lands exactly on the pre-existing "unknown start time" sentinel — consistent behavior, not a new silent failure mode. Even if the function returned an error today, every caller would discard it.
  3. The PR's job is to remove UB. 0/0 is defined behavior; the out-of-range double→int cast was UB. Replacing UB with a defined sentinel is the fix. Bolting on error-return machinery is a separate design change (same reason the tv_nsec == 1e9 carry and negative-fraction normalization were split into fix: hdr_timespec_from_double could emit a malformed hdr_timespec (tv_nsec == 1e9, or negative) #156).

If a checked path is wanted later, the minimal non-breaking shape is additive and belongs in its own PR, not here:

/* returns 0 on success, -EINVAL on non-finite, -ERANGE on out-of-tv_sec-range input */
int hdr_timespec_from_double_checked(hdr_timespec* t, double value);

with the existing void function kept as a thin wrapper that calls it and zeroes on failure — so no caller and no ABI break, and encode/decode callers that care could then propagate the error.

(Adversarial re-review of the current head was 7/7 green through all correctness lenses; this was the only open thread.)

@paulorsousa paulorsousa Sep 30, 2026

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Sound good!!
Approving

return;
}

milliseconds = (int) round((value - seconds) * 1000);

#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
t->tv_sec = (long) seconds;
#else
t->tv_sec = (time_t) seconds;
#endif
t->tv_nsec = milliseconds * 1000000;
}
2 changes: 2 additions & 0 deletions test/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -85,6 +85,8 @@ foreach(V 2.0.1.logV0 2.0.6.logV1 2.0.7S.logV2 2.0.7S.logV3)
configure_file(jHiccup-${V}.hlog jHiccup-${V}.hlog COPYONLY)
endforeach()

configure_file(regression-log-start-time-overflow.hlog regression-log-start-time-overflow.hlog COPYONLY)

foreach(V test_tagged_invalid_histogram.txt test_tagged_invalid_tag_key.txt test_tagged_invalid_timestamp.txt test_tagged_missing_histogram.txt test_overflow_timestamp_seconds.txt test_overflow_timestamp_nanos.txt test_timestamp_seconds_2pow31.txt)
configure_file(${V} ${V} COPYONLY)
endforeach()
25 changes: 25 additions & 0 deletions test/hdr_histogram_log_test.c
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Original file line number Diff line number Diff line change
Expand Up @@ -993,6 +993,30 @@ static int parse_line_from_file(const char* filename)
return result;
}

/* A StartTime beyond int range must not be an out-of-range cast (UBSan). */
static char* handle_wide_start_time(void)
{
struct hdr_log_reader reader;
int rc;

FILE* f = fopen("regression-log-start-time-overflow.hlog", "r");
mu_assert("Can not open wide start time log", f != NULL);

hdr_log_reader_init(&reader);
rc = hdr_log_read_header(&reader, f);
fclose(f);

mu_assert("Failed to read header", compare_int(0, rc));
if (sizeof(reader.start_timestamp.tv_sec) >= 8)
{
mu_assert(
"Start time wrong",
compare_int64(INT64_C(1403476110183), (int64_t) reader.start_timestamp.tv_sec));
}

return 0;
}

static char* handle_invalid_log_lines(void)
{
mu_assert("Should have invalid histogram", -EINVAL == parse_line_from_file("test_tagged_invalid_histogram.txt"));
Expand Down Expand Up @@ -1159,6 +1183,7 @@ static struct mu_result all_tests(void)
mu_run_test(decode_v1_log);
mu_run_test(decode_v0_log);
mu_run_test(handle_invalid_log_lines);
mu_run_test(handle_wide_start_time);
mu_run_test(handle_sub_nanosecond_timestamp);
mu_run_test(handle_timestamp_at_long_boundary);

Expand Down
48 changes: 48 additions & 0 deletions test/hdr_histogram_test.c
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Original file line number Diff line number Diff line change
Expand Up @@ -12,8 +12,10 @@
#include <math.h>

#include <stdio.h>
#include <math.h>
#include <hdr/hdr_histogram.h>
#include <hdr/hdr_interval_recorder.h>
#include <hdr/hdr_time.h>

#include "minunit.h"
#include "hdr_test_util.h"
Expand Down Expand Up @@ -159,6 +161,51 @@ static char* test_invalid_init(void)
return 0;
}

static char* test_timespec_from_double(void)
{
hdr_timespec t;

hdr_timespec_from_double(&t, 1403476110.183);
mu_assert("seconds wrong", compare_int64(INT64_C(1403476110), (int64_t) t.tv_sec));
mu_assert("nanoseconds wrong", compare_int64(INT64_C(183000000), (int64_t) t.tv_nsec));

hdr_timespec_from_double(&t, -2.0);
mu_assert("negative seconds wrong", compare_int64(INT64_C(-2), (int64_t) t.tv_sec));
mu_assert("negative nanoseconds wrong", compare_int64(INT64_C(0), (int64_t) t.tv_nsec));

/* Exceeds int but fits a 64-bit destination; reachable from a log header. */
hdr_timespec_from_double(&t, 1403476110183.0);
if (sizeof(t.tv_sec) >= 8)
{
mu_assert("wide seconds wrong", compare_int64(INT64_C(1403476110183), (int64_t) t.tv_sec));
}
else
{
mu_assert("unrepresentable seconds should be zeroed", compare_int64(INT64_C(0), (int64_t) t.tv_sec));
}
mu_assert("wide nanoseconds wrong", compare_int64(INT64_C(0), (int64_t) t.tv_nsec));

/* Values tv_sec cannot hold, and non-finite values, must not be converted. */
hdr_timespec_from_double(&t, 1e300);
mu_assert("huge seconds should be zeroed", compare_int64(INT64_C(0), (int64_t) t.tv_sec));
mu_assert("huge nanoseconds should be zeroed", compare_int64(INT64_C(0), (int64_t) t.tv_nsec));

hdr_timespec_from_double(&t, -1e300);
mu_assert("huge negative seconds should be zeroed", compare_int64(INT64_C(0), (int64_t) t.tv_sec));

hdr_timespec_from_double(&t, INFINITY);
mu_assert("inf seconds should be zeroed", compare_int64(INT64_C(0), (int64_t) t.tv_sec));

hdr_timespec_from_double(&t, -INFINITY);
mu_assert("-inf seconds should be zeroed", compare_int64(INT64_C(0), (int64_t) t.tv_sec));

hdr_timespec_from_double(&t, NAN);
mu_assert("nan seconds should be zeroed", compare_int64(INT64_C(0), (int64_t) t.tv_sec));
mu_assert("nan nanoseconds should be zeroed", compare_int64(INT64_C(0), (int64_t) t.tv_nsec));

return 0;
}

static char* test_bucket_config_shift_overflow(void)
{
struct hdr_histogram* h = NULL;
Expand Down Expand Up @@ -767,6 +814,7 @@ static struct mu_result all_tests(void)
{
mu_run_test(test_create);
mu_run_test(test_invalid_init);
mu_run_test(test_timespec_from_double);
mu_run_test(test_bucket_config_shift_overflow);
mu_run_test(test_bucket_config_reject_defines_cfg);
mu_run_test(test_create_with_large_values);
Expand Down
66 changes: 66 additions & 0 deletions test/regression-log-start-time-overflow.hlog
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Original file line number Diff line number Diff line change
@@ -0,0 +1,66 @@
#[Logged with jHiccup version 2.0.7-SNAPSHOT]
#[Histogram log format version 1.2]
#[StartTime: 1403476110183.0 (seconds since epoch), Mon Jun 23 10:28:30 NZST 2014]
"StartTimestamp","Interval_Length","Interval_Max","Interval_Compressed_Histogram"
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