The 32-bit integer part of the NTP timestamp overflows in year 2036,
which starts the second NTP era.
Modify the timestamp conversion to shift values between 1900-1970 (in
the first era) to the second era to enable the client to synchronize
correctly until year 2106 (assuming 64-bit time_t).
Signed-off-by: Miroslav Lichvar <mlich...@redhat.com>
---
networking/ntpd.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/networking/ntpd.c b/networking/ntpd.c
index 204e1d7c2..d0c61b4bb 100644
--- a/networking/ntpd.c
+++ b/networking/ntpd.c
@@ -565,6 +565,9 @@ lfp_to_d(l_fixedpt_t lfp)
lfp.int_partl = ntohl(lfp.int_partl);
lfp.fractionl = ntohl(lfp.fractionl);
ret = (double)lfp.int_partl + ((double)lfp.fractionl / UINT_MAX);
+ /* Shift timestamps before 1970 to the second NTP era (2036-2106) */
+ if (lfp.int_partl < OFFSET_1900_1970)
+ ret += (double)UINT_MAX + 1.0;
return ret;
}
static NOINLINE double
--
2.35.1
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