From b3a5ac42ab18b7d1a8f2f072ca0ee76a3b754a43 Mon Sep 17 00:00:00 2001
From: Alexandre Belloni <alexandre.belloni@bootlin.com>
Date: Thu, 8 Mar 2018 23:27:31 +0100
Subject: [PATCH] rtc: hctosys: Ensure system time doesn't overflow time_t
Git-commit: b3a5ac42ab18b7d1a8f2f072ca0ee76a3b754a43
Patch-mainline: v4.17-rc1
References: bsc#1051510

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/rtc/hctosys.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/rtc/hctosys.c b/drivers/rtc/hctosys.c
index e1cfa06810ef..e79f2a181ad2 100644
--- a/drivers/rtc/hctosys.c
+++ b/drivers/rtc/hctosys.c
@@ -49,6 +49,11 @@ static int __init rtc_hctosys(void)
 
 	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);
 
 	dev_info(rtc->dev.parent,
-- 
2.18.0