diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/noise.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/noise.c b/src/noise.c index e629307..1a85723 100644 --- a/src/noise.c +++ b/src/noise.c @@ -451,6 +451,15 @@ static void tai64n_now(u8 output[NOISE_TIMESTAMP_LEN]) struct timespec64 now; ktime_get_real_ts64(&now); + + /* In order to prevent some sort of infoleak from precise timers, we + * round down the nanoseconds part to the closest rounded-down power of + * two to the maximum initiations per second allowed anyway by the + * implementation. + */ + now.tv_nsec = ALIGN_DOWN(now.tv_nsec, + rounddown_pow_of_two(NSEC_PER_SEC / INITIATIONS_PER_SECOND)); + /* https://cr.yp.to/libtai/tai64.html */ *(__be64 *)output = cpu_to_be64(0x400000000000000aULL + now.tv_sec); *(__be32 *)(output + sizeof(__be64)) = cpu_to_be32(now.tv_nsec); |