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lib/rtc: Add sanity check for time and date 

Add a function to check sanity of a given RTC date and time.
Invalid values in terms of overrun ranges of the registers can lead to
strange issues in the OS.

Change-Id: I0a381d445c894eee4f82b50fe86dad22cc587605
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54913
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
This commit is contained in:
Werner Zeh 2021-05-25 14:19:50 +02:00 committed by Patrick Georgi
parent 80d5a05cfd
commit 1724b74f69
2 changed files with 17 additions and 0 deletions
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1
src/include/rtc.h
View File

@ -21,5 +21,6 @@ int rtc_get(struct rtc_time *time);
int rtc_to_tm(int tim, struct rtc_time *tm);
unsigned long rtc_mktime(const struct rtc_time *tm);
void rtc_display(const struct rtc_time *tm);
int rtc_invalid(const struct rtc_time *tm);
#endif /* _RTC_H_ */

16
src/lib/rtc.c
View File

@ -121,3 +121,19 @@ void rtc_display(const struct rtc_time *tm)
(tm->wday < 0 || tm->wday > 6) ? "unknown " : weekdays[tm->wday],
tm->hour, tm->min, tm->sec);
}
static int rtc_month_days(unsigned int month, unsigned int year)
{
int month_days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
return month_days[month] + (LEAP_YEAR(year) && month == 2);
}
int rtc_invalid(const struct rtc_time *tm)
{
if (tm->sec > 59 || tm->min > 59 || tm->hour > 23 || tm->mon == 0 || tm->mon > 12 ||
tm->year < 1970 || tm->mday > rtc_month_days(tm->mon - 1, tm->year))
return 1;
else
return 0;
}