linux-kernel - [RFC PATCH v3 2/5] time: Provide y2038 safe timekeeping_inject

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1416309320-7498-3-git-send-email-pang.xunlei@linaro.org>
Date:	Tue, 18 Nov 2014 19:15:17 +0800
From:	"pang.xunlei" <pang.xunlei@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	rtc-linux@...glegroups.com, Thomas Gleixner <tglx@...utronix.de>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	John Stultz <john.stultz@...aro.org>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	"pang.xunlei" <pang.xunlei@...aro.org>
Subject: [RFC PATCH v3 2/5] time: Provide y2038 safe timekeeping_inject_sleeptime() replacement

As part of addressing "y2038 problem" for in-kernel uses, this
patch adds timekeeping_inject_sleeptime64() using timespec64.

After this patch, timekeeping_inject_sleeptime() is deprecated
and all its call sites will be fixed using the new interface,
after that it can be removed.

NOTE: timekeeping_inject_sleeptime() is safe actually, but we
want to eliminate timespec eventually, so comes this patch.

Signed-off-by: pang.xunlei <pang.xunlei@...aro.org>
---
 include/linux/timekeeping.h |   13 ++++++++++++-
 kernel/time/timekeeping.c   |   10 ++++------
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index 071ad7e..6d76c65 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -201,7 +201,18 @@ static inline void timekeeping_clocktai(struct timespec *ts)
 /*
  * RTC specific
  */
-extern void timekeeping_inject_sleeptime(struct timespec *delta);
+extern void timekeeping_inject_sleeptime64(struct timespec64 *delta);
+
+/**
+ * Deprecated. Use timekeeping_inject_sleeptime64().
+ */
+static inline void timekeeping_inject_sleeptime(struct timespec *delta)
+{
+	struct timespec64 delta64;
+
+	delta64 = timespec_to_timespec64(*delta);
+	timekeeping_inject_sleeptime64(&delta64);
+}
 
 /*
  * PPS accessor
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 1d33550..d37f775 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1067,8 +1067,8 @@ static void __timekeeping_inject_sleeptime(struct timekeeper *tk,
 }
 
 /**
- * timekeeping_inject_sleeptime - Adds suspend interval to timeekeeping values
- * @delta: pointer to a timespec delta value
+ * timekeeping_inject_sleeptime64 - Adds suspend interval to timeekeeping values
+ * @delta: pointer to a timespec64 delta value
  *
  * This hook is for architectures that cannot support read_persistent_clock
  * because their RTC/persistent clock is only accessible when irqs are enabled.
@@ -1076,10 +1076,9 @@ static void __timekeeping_inject_sleeptime(struct timekeeper *tk,
  * This function should only be called by rtc_resume(), and allows
  * a suspend offset to be injected into the timekeeping values.
  */
-void timekeeping_inject_sleeptime(struct timespec *delta)
+void timekeeping_inject_sleeptime64(struct timespec64 *delta)
 {
 	struct timekeeper *tk = &tk_core.timekeeper;
-	struct timespec64 tmp;
 	unsigned long flags;
 
 	/*
@@ -1094,8 +1093,7 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
 
 	timekeeping_forward_now(tk);
 
-	tmp = timespec_to_timespec64(*delta);
-	__timekeeping_inject_sleeptime(tk, &tmp);
+	__timekeeping_inject_sleeptime(tk, delta);
 
 	timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
 
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/