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rtc: hctosys: Ensure system time doesn't overflow time_t

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On 32bit platforms, time_t is still a signed 32bit long. If it is
overflowed, userspace and the kernel cant agree on the current system time.
This causes multiple issues, in particular with systemd:
https://github.com/systemd/systemd/issues/1143

A good workaround is to simply avoid using hctosys which is something I
greatly encourage as the time is better set by userspace.

However, many distribution enable it and use systemd which is rendering the
system unusable in case the RTC holds a date after 2038 (and more so after
2106). Many drivers have workaround for this case and they should be
eliminated so there is only one place left to fix when userspace is able to
cope with dates after the 31bit overflow.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni 2018-03-08 23:27:31 +01:00
parent f6b1a3a4a7
commit b3a5ac42ab
1 changed files with 5 additions and 0 deletions
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5
drivers/rtc/hctosys.c
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@ -49,6 +49,11 @@ static int __init rtc_hctosys(void)
tv64.tv_sec = rtc_tm_to_time64(&tm); tv64.tv_sec = rtc_tm_to_time64(&tm);
#if BITS_PER_LONG == 32
if (tv64.tv_sec > INT_MAX)
goto err_read;
#endif
err = do_settimeofday64(&tv64); err = do_settimeofday64(&tv64);
dev_info(rtc->dev.parent, dev_info(rtc->dev.parent,