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[NTOS:EX] Various fixes for Daylight Saving Time transitions (#5868)
* [NTOS:EX] Various fixes for Daylight Saving Time transitions * Fix automatic time changes when DST starts and ends. * Currently it takes two cycles of the update provided by w32time to make the actual change. * Convert Eric Kohl's TimeZoneID code contained in ExRefreshTimeZoneInformation to a new function. * Use this new function in ExpSetTimeZoneInformation and ExRefreshTimeZoneInformation functions. CORE-19290
This commit is contained in:
Doug Lyons
GitHub
parent
28eb4e726a
commit
69ebfd671d
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@ -30,6 +30,100 @@ ULONG ExpTimerResolutionCount = 0;
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/* FUNCTIONS ****************************************************************/
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/*++
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* If successful, this function sets the following global variable:
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* ExpTimeZoneInfo
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*--*/
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static
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BOOLEAN
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ExpGetTimeZoneId(
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_In_ PLARGE_INTEGER TimeNow,
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_Out_ PULONG TimeZoneId,
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_Out_ PLARGE_INTEGER NewTimeZoneBias)
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{
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LARGE_INTEGER StandardTime;
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LARGE_INTEGER DaylightTime;
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LARGE_INTEGER LocalTimeNow = *TimeNow;
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NTSTATUS Status;
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DPRINT("ExpGetTimeZoneId\n");
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/* Read time zone information from the registry */
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Status = RtlQueryTimeZoneInformation(&ExpTimeZoneInfo);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("RtlQueryTimeZoneInformation failed (Status 0x%08lx)\n", Status);
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return FALSE;
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}
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/* Get the default bias */
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NewTimeZoneBias->QuadPart = (LONGLONG)ExpTimeZoneInfo.Bias * TICKSPERMINUTE;
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if (ExpTimeZoneInfo.StandardDate.Month != 0 &&
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ExpTimeZoneInfo.DaylightDate.Month != 0)
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{
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/* Get this year's standard start time */
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if (!RtlCutoverTimeToSystemTime(&ExpTimeZoneInfo.StandardDate,
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&StandardTime,
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&LocalTimeNow,
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TRUE))
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{
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DPRINT1("RtlCutoverTimeToSystemTime for StandardDate failed\n");
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return FALSE;
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}
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/* Get this year's daylight start time */
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if (!RtlCutoverTimeToSystemTime(&ExpTimeZoneInfo.DaylightDate,
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&DaylightTime,
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&LocalTimeNow,
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TRUE))
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{
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DPRINT1("RtlCutoverTimeToSystemTime for DaylightDate failed\n");
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return FALSE;
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}
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/* Determine the time zone id and update the time zone bias */
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if (DaylightTime.QuadPart < StandardTime.QuadPart)
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{
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if ((LocalTimeNow.QuadPart >= DaylightTime.QuadPart) &&
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(LocalTimeNow.QuadPart < StandardTime.QuadPart))
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{
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DPRINT("Daylight time\n");
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*TimeZoneId = TIME_ZONE_ID_DAYLIGHT;
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NewTimeZoneBias->QuadPart += (LONGLONG)ExpTimeZoneInfo.DaylightBias * TICKSPERMINUTE;
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}
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else
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{
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DPRINT("Standard time\n");
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*TimeZoneId = TIME_ZONE_ID_STANDARD;
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NewTimeZoneBias->QuadPart += (LONGLONG)ExpTimeZoneInfo.StandardBias * TICKSPERMINUTE;
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}
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}
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else
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{
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if ((LocalTimeNow.QuadPart >= StandardTime.QuadPart) &&
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(LocalTimeNow.QuadPart < DaylightTime.QuadPart))
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{
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DPRINT("Standard time\n");
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*TimeZoneId = TIME_ZONE_ID_STANDARD;
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NewTimeZoneBias->QuadPart += (LONGLONG)ExpTimeZoneInfo.StandardBias * TICKSPERMINUTE;
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}
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else
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{
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DPRINT("Daylight time\n");
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*TimeZoneId = TIME_ZONE_ID_DAYLIGHT;
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NewTimeZoneBias->QuadPart += (LONGLONG)ExpTimeZoneInfo.DaylightBias * TICKSPERMINUTE;
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}
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}
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}
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else
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{
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*TimeZoneId = TIME_ZONE_ID_UNKNOWN;
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}
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return TRUE;
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}
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/*++
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* @name ExAcquireTimeRefreshLock
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*
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@ -225,105 +319,39 @@ BOOLEAN
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NTAPI
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ExRefreshTimeZoneInformation(IN PLARGE_INTEGER CurrentBootTime)
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{
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LARGE_INTEGER StandardTime;
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LARGE_INTEGER DaylightTime;
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LARGE_INTEGER CurrentTime;
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NTSTATUS Status;
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LARGE_INTEGER CurrentTime, NewTimeZoneBias;
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BOOLEAN Success;
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/* Read time zone information from the registry */
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Status = RtlQueryTimeZoneInformation(&ExpTimeZoneInfo);
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if (!NT_SUCCESS(Status))
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DPRINT("ExRefreshTimeZoneInformation\n");
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/* Set the global data for ExpTimeZoneBias and the Time Zone ID */
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Success = ExpGetTimeZoneId(CurrentBootTime, &ExpTimeZoneId, &NewTimeZoneBias);
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if (!Success)
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{
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DPRINT1("RtlQueryTimeZoneInformation() failed (Status 0x%08lx)\n", Status);
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DPRINT1("ExpGetTimeZoneId failed\n");
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return FALSE;
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}
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DPRINT("ExpTimeZoneId is %lu\n", ExpTimeZoneId);
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/* Get the default bias */
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ExpTimeZoneBias.QuadPart = (LONGLONG)ExpTimeZoneInfo.Bias * TICKSPERMINUTE;
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ExpTimeZoneBias = NewTimeZoneBias;
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if (ExpTimeZoneInfo.StandardDate.Month != 0 &&
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ExpTimeZoneInfo.DaylightDate.Month != 0)
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{
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/* Get this years standard start time */
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if (!RtlCutoverTimeToSystemTime(&ExpTimeZoneInfo.StandardDate,
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&StandardTime,
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CurrentBootTime,
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TRUE))
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{
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DPRINT1("RtlCutoverTimeToSystemTime() for StandardDate failed!\n");
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return FALSE;
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}
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/* Get this years daylight start time */
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if (!RtlCutoverTimeToSystemTime(&ExpTimeZoneInfo.DaylightDate,
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&DaylightTime,
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CurrentBootTime,
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TRUE))
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{
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DPRINT1("RtlCutoverTimeToSystemTime() for DaylightDate failed!\n");
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return FALSE;
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}
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/* Determine the time zone id and update the time zone bias */
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if (DaylightTime.QuadPart < StandardTime.QuadPart)
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{
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if ((CurrentBootTime->QuadPart >= DaylightTime.QuadPart) &&
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(CurrentBootTime->QuadPart < StandardTime.QuadPart))
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{
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DPRINT("Daylight time!\n");
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ExpTimeZoneId = TIME_ZONE_ID_DAYLIGHT;
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ExpTimeZoneBias.QuadPart += (LONGLONG)ExpTimeZoneInfo.DaylightBias * TICKSPERMINUTE;
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}
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else
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{
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DPRINT("Standard time!\n");
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ExpTimeZoneId = TIME_ZONE_ID_STANDARD;
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ExpTimeZoneBias.QuadPart += (LONGLONG)ExpTimeZoneInfo.StandardBias * TICKSPERMINUTE;
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}
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}
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else
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{
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if ((CurrentBootTime->QuadPart >= StandardTime.QuadPart) &&
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(CurrentBootTime->QuadPart < DaylightTime.QuadPart))
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{
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DPRINT("Standard time!\n");
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ExpTimeZoneId = TIME_ZONE_ID_STANDARD;
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ExpTimeZoneBias.QuadPart += (LONGLONG)ExpTimeZoneInfo.StandardBias * TICKSPERMINUTE;
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}
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else
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{
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DPRINT("Daylight time!\n");
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ExpTimeZoneId = TIME_ZONE_ID_DAYLIGHT;
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ExpTimeZoneBias.QuadPart += (LONGLONG)ExpTimeZoneInfo.DaylightBias * TICKSPERMINUTE;
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}
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}
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}
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else
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{
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ExpTimeZoneId = TIME_ZONE_ID_UNKNOWN;
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}
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/* Change it for user-mode applications */
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SharedUserData->TimeZoneBias.High1Time = ExpTimeZoneBias.u.HighPart;
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/* Change SharedUserData->TimeZoneBias for user-mode applications */
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SharedUserData->TimeZoneBias.High2Time = ExpTimeZoneBias.u.HighPart;
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SharedUserData->TimeZoneBias.LowPart = ExpTimeZoneBias.u.LowPart;
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SharedUserData->TimeZoneBias.High1Time = ExpTimeZoneBias.u.HighPart;
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SharedUserData->TimeZoneId = ExpTimeZoneId;
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/* Convert boot time from local time to UTC */
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KeBootTime.QuadPart += ExpTimeZoneBias.QuadPart;
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/* Convert system time from local time to UTC */
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do
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{
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CurrentTime.u.HighPart = SharedUserData->SystemTime.High1Time;
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CurrentTime.u.LowPart = SharedUserData->SystemTime.LowPart;
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} while (CurrentTime.u.HighPart != SharedUserData->SystemTime.High2Time);
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KeQuerySystemTime(&CurrentTime);;
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/* Change it for user-mode applications */
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CurrentTime.QuadPart += ExpTimeZoneBias.QuadPart;
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SharedUserData->SystemTime.High2Time = CurrentTime.u.HighPart;
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SharedUserData->SystemTime.LowPart = CurrentTime.u.LowPart;
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SharedUserData->SystemTime.High1Time = CurrentTime.u.HighPart;
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SharedUserData->SystemTime.High2Time = CurrentTime.u.HighPart;
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/* Return success */
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return TRUE;
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@ -332,9 +360,43 @@ ExRefreshTimeZoneInformation(IN PLARGE_INTEGER CurrentBootTime)
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NTSTATUS
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ExpSetTimeZoneInformation(PRTL_TIME_ZONE_INFORMATION TimeZoneInformation)
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{
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LARGE_INTEGER LocalTime, SystemTime, OldTime;
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LARGE_INTEGER LocalTime, SystemTime, OldTime, NewTimeZoneBias;
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TIME_FIELDS TimeFields;
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DPRINT("ExpSetTimeZoneInformation() called\n");
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BOOLEAN Success;
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NTSTATUS Status;
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LARGE_INTEGER LocalTimeNow;
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DPRINT("ExpSetTimeZoneInformation called\n");
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/* Read time zone information from the registry */
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Status = RtlQueryTimeZoneInformation(&ExpTimeZoneInfo);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("RtlQueryTimeZoneInformation failed (Status 0x%08lx)\n", Status);
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return FALSE;
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}
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/* Get the default bias */
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NewTimeZoneBias.QuadPart = (LONGLONG)ExpTimeZoneInfo.Bias * TICKSPERMINUTE;
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/* Get the Shared User Data System Time into the local SystemTime */
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KeQuerySystemTime(&SystemTime);
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LocalTimeNow = SystemTime;
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/* Adjust LocalTimeNow for Time Zone Bias to use UTC for comparisons */
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LocalTimeNow.QuadPart -= NewTimeZoneBias.QuadPart;
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/* Set the Global Data for ExpTimeZoneBias and ExpTimeZoneId */
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Success = ExpGetTimeZoneId(&LocalTimeNow, &ExpTimeZoneId, &NewTimeZoneBias);
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if (!Success)
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{
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DPRINT1("ExpGetTimeZoneId failed\n");
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return STATUS_UNSUCCESSFUL;
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}
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DPRINT("ExpTimeZoneId is %lu\n", ExpTimeZoneId);
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ExpTimeZoneBias = NewTimeZoneBias;
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DPRINT("Old time zone bias: %d minutes\n", ExpTimeZoneInfo.Bias);
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DPRINT("Old time zone standard bias: %d minutes\n",
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@ -347,13 +409,14 @@ ExpSetTimeZoneInformation(PRTL_TIME_ZONE_INFORMATION TimeZoneInformation)
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HalQueryRealTimeClock(&TimeFields);
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RtlTimeFieldsToTime(&TimeFields, &LocalTime);
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/* FIXME: Calculate transition dates */
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/* Calculate the bias and set the ID */
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/* Calculate the bias */
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ExpTimeZoneBias.QuadPart = ((LONGLONG)(TimeZoneInformation->Bias +
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TimeZoneInformation->StandardBias)) *
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TICKSPERMINUTE;
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ExpTimeZoneId = TIME_ZONE_ID_STANDARD;
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/* If Daylight Savings Time then add the DayLightBias to the Time Zone Bias */
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if (ExpTimeZoneId == TIME_ZONE_ID_DAYLIGHT)
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ExpTimeZoneBias.QuadPart += (LONGLONG)ExpTimeZoneInfo.DaylightBias * TICKSPERMINUTE;
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/* Copy the timezone information */
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RtlCopyMemory(&ExpTimeZoneInfo,
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@ -377,7 +440,7 @@ ExpSetTimeZoneInformation(PRTL_TIME_ZONE_INFORMATION TimeZoneInformation)
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PoNotifySystemTimeSet();
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/* Return success */
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DPRINT("ExpSetTimeZoneInformation() done\n");
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DPRINT("ExpSetTimeZoneInformation done\n");
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return STATUS_SUCCESS;
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}
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@ -401,6 +464,8 @@ NtSetSystemTime(IN PLARGE_INTEGER SystemTime,
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TIME_FIELDS TimeFields;
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KPROCESSOR_MODE PreviousMode = ExGetPreviousMode();
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NTSTATUS Status = STATUS_SUCCESS;
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RTL_TIME_ZONE_INFORMATION TimeZoneInformation = { 0 };
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ULONG TimeZoneIdSave;
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PAGED_CODE();
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@ -468,6 +533,27 @@ NtSetSystemTime(IN PLARGE_INTEGER SystemTime,
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_SEH2_END;
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}
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/* Read time zone information from the registry and set the clock */
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Status = RtlQueryTimeZoneInformation(&TimeZoneInformation);
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if (!NT_SUCCESS(Status))
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{
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DPRINT1("RtlQueryTimeZoneInformation failed (Status 0x%08lx)\n", Status);
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}
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/* Test if we went from Daylight to Standard Time or vice versa */
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TimeZoneIdSave = ExpTimeZoneId;
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ExpSetTimeZoneInformation(&TimeZoneInformation);
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if (ExpTimeZoneId != TimeZoneIdSave)
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{
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/* Going from DT to ST or vice versa we need to repeat this */
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DPRINT("Daylight Time and Standard Time are switching\n");
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/* Set the system time and notify the system */
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KeSetSystemTime(&NewSystemTime, &OldSystemTime, FALSE, NULL);
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PoNotifySystemTimeSet();
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}
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/* Return status */
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return Status;
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}
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