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efi_loader: check time in SetTime()

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The UEFI spec prescribes that we check that the timestamp passed to
SetTime() is checked for validity.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-05-31 07:35:19 +02:00
parent 3c1889e639
commit e6bcc35452
1 changed files with 25 additions and 1 deletions
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26
lib/efi_loader/efi_runtime.c
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@ -214,6 +214,30 @@ out:
#endif
}
#ifdef CONFIG_DM_RTC
/**
* efi_validate_time() - checks if timestamp is valid
*
* @time: timestamp to validate
* Returns: 0 if timestamp is valid, 1 otherwise
*/
static int efi_validate_time(struct efi_time *time)
{
return (!time ||
time->year < 1900 || time->year > 9999 ||
!time->month || time->month > 12 || !time->day ||
time->day > rtc_month_days(time->month - 1, time->year) ||
time->hour > 23 || time->minute > 59 || time->second > 59 ||
time->nanosecond > 999999999 ||
time->daylight &
~(EFI_TIME_IN_DAYLIGHT | EFI_TIME_ADJUST_DAYLIGHT) ||
((time->timezone < -1440 || time->timezone > 1440) &&
time->timezone != EFI_UNSPECIFIED_TIMEZONE));
}
#endif
/**
* efi_set_time_boottime() - set current time
*
@ -235,7 +259,7 @@ static efi_status_t EFIAPI efi_set_time_boottime(struct efi_time *time)
EFI_ENTRY("%p", time);
if (!time) {
if (efi_validate_time(time)) {
ret = EFI_INVALID_PARAMETER;
goto out;
}