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efi_loader: handling of daylight saving time

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If SetTime() is meant to set daylight saving time it will be called with
Time.Daylight == EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT.

Return 0 from GetTime() if time is not in daylight because we cannot
determine if we are in a time zone with daylight saving time.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-05-31 22:08:45 +02:00
parent 656f17106b
commit 38b9a79c63
1 changed files with 5 additions and 4 deletions
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9
lib/efi_loader/efi_runtime.c
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@ -195,9 +195,9 @@ static efi_status_t EFIAPI efi_get_time_boottime(
time->hour = tm.tm_hour;
time->minute = tm.tm_min;
time->second = tm.tm_sec;
time->daylight = EFI_TIME_ADJUST_DAYLIGHT;
if (tm.tm_isdst > 0)
time->daylight |= EFI_TIME_IN_DAYLIGHT;
if (tm.tm_isdst)
time->daylight =
EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT;
time->timezone = EFI_UNSPECIFIED_TIMEZONE;
if (capabilities) {
@ -276,7 +276,8 @@ static efi_status_t EFIAPI efi_set_time_boottime(struct efi_time *time)
tm.tm_hour = time->hour;
tm.tm_min = time->minute;
tm.tm_sec = time->second;
tm.tm_isdst = time->daylight == EFI_TIME_IN_DAYLIGHT;
tm.tm_isdst = time->daylight ==
(EFI_TIME_ADJUST_DAYLIGHT | EFI_TIME_IN_DAYLIGHT);
/* Calculate day of week */
rtc_calc_weekday(&tm);