[patch 2/2] alarm unsigned signed conversion fixup

From: Thomas Gleixner <tglx@linutronix.de>
To: Andrew Morton <akpm@osdl.org>
Cc: LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
	Tom Rini <trini@kernel.crashing.org>
Subject: [patch 2/2] alarm unsigned signed conversion fixup
Date: Sat, 18 Mar 2006 15:18:26 -0000	[thread overview]
Message-ID: <20060318142831.114986000@localhost.localdomain> (raw)
In-Reply-To: 20060318142827.419018000@localhost.localdomain

[-- Attachment #1: alarm-fixup-unsigned-signed.patch --]
[-- Type: text/plain, Size: 6637 bytes --]


alarm() calls the kernel with an unsigend int timeout in seconds.
The value is converted to a timeval which is used to setup the
itimer. The tv_sec field of the timeval is a long, which causes
the timeout to be negative on 32 bit machines if seconds > INT_MAX.
Also this was silently caught before the hrtimer merge. 
To avoid fixups all over the place the duplicated sys_alarm code 
is moved to itimer.c.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

 arch/ia64/ia32/sys_ia32.c   |   14 +-------------
 arch/mips/kernel/sysirix.c  |   22 +---------------------
 arch/x86_64/ia32/sys_ia32.c |   16 ++--------------
 include/linux/time.h        |    1 +
 kernel/itimer.c             |   34 ++++++++++++++++++++++++++++++++++
 kernel/timer.c              |   14 +-------------
 6 files changed, 40 insertions(+), 61 deletions(-)

Index: linux-2.6.16-rc6-updates/kernel/itimer.c
===================================================================

--- linux-2.6.16-rc6-updates.orig/kernel/itimer.c
+++ linux-2.6.16-rc6-updates/kernel/itimer.c
@@ -234,6 +234,40 @@ again:
 	return 0;
 }
 
+/**
+ * alarm_setitimer - set alarm in seconds
+ *
+ * @seconds:	number of seconds until alarm
+ *		0 disables the alarm
+ *
+ * Returns the remaining time in seconds of a pending timer or 0 when
+ * the timer is not active.
+ */
+unsigned int alarm_setitimer(unsigned int seconds)
+{
+	struct itimerval it_new, it_old;
+
+#if BITS_PER_LONG < 64
+	if (seconds > INT_MAX)
+		seconds = INT_MAX;
+#endif
+	it_new.it_value.tv_sec = seconds;
+	it_new.it_value.tv_usec = 0;
+	it_new.it_interval.tv_sec = it_new.it_interval.tv_usec = 0;
+
+	do_setitimer(ITIMER_REAL, &it_new, &it_old);
+
+	/*
+	 * We can't return 0 if we have an alarm pending ...  And we'd
+	 * better return too much than too little anyway
+	 */
+	if ((!it_old.it_value.tv_sec && it_old.it_value.tv_usec) ||
+	      it_old.it_value.tv_usec >= 500000)
+		it_old.it_value.tv_sec++;
+
+	return it_old.it_value.tv_sec;
+}
+
 asmlinkage long sys_setitimer(int which,
 			      struct itimerval __user *value,
 			      struct itimerval __user *ovalue)
Index: linux-2.6.16-rc6-updates/arch/ia64/ia32/sys_ia32.c
===================================================================
--- linux-2.6.16-rc6-updates.orig/arch/ia64/ia32/sys_ia32.c
+++ linux-2.6.16-rc6-updates/arch/ia64/ia32/sys_ia32.c
@@ -1166,19 +1166,7 @@ put_tv32 (struct compat_timeval __user *
 asmlinkage unsigned long
 sys32_alarm (unsigned int seconds)
 {
-	struct itimerval it_new, it_old;
-	unsigned int oldalarm;
-
-	it_new.it_interval.tv_sec = it_new.it_interval.tv_usec = 0;
-	it_new.it_value.tv_sec = seconds;
-	it_new.it_value.tv_usec = 0;
-	do_setitimer(ITIMER_REAL, &it_new, &it_old);
-	oldalarm = it_old.it_value.tv_sec;
-	/* ehhh.. We can't return 0 if we have an alarm pending.. */
-	/* And we'd better return too much than too little anyway */
-	if (it_old.it_value.tv_usec)
-		oldalarm++;
-	return oldalarm;
+	return alarm_setitimer(seconds);
 }
 
 /* Translations due to time_t size differences.  Which affects all
Index: linux-2.6.16-rc6-updates/arch/mips/kernel/sysirix.c
===================================================================
--- linux-2.6.16-rc6-updates.orig/arch/mips/kernel/sysirix.c
+++ linux-2.6.16-rc6-updates/arch/mips/kernel/sysirix.c
@@ -645,27 +645,7 @@ static inline void getitimer_real(struct
 
 asmlinkage unsigned int irix_alarm(unsigned int seconds)
 {
-	struct itimerval it_new, it_old;
-	unsigned int oldalarm;
-
-	if (!seconds) {
-		getitimer_real(&it_old);
-		del_timer(&current->real_timer);
-	} else {
-		it_new.it_interval.tv_sec = it_new.it_interval.tv_usec = 0;
-		it_new.it_value.tv_sec = seconds;
-		it_new.it_value.tv_usec = 0;
-		do_setitimer(ITIMER_REAL, &it_new, &it_old);
-	}
-	oldalarm = it_old.it_value.tv_sec;
-	/*
-	 * ehhh.. We can't return 0 if we have an alarm pending ...
-	 * And we'd better return too much than too little anyway
-	 */
-	if (it_old.it_value.tv_usec)
-		oldalarm++;
-
-	return oldalarm;
+	return alarm_setitimer(seconds);
 }
 
 asmlinkage int irix_pause(void)
Index: linux-2.6.16-rc6-updates/arch/x86_64/ia32/sys_ia32.c
===================================================================
--- linux-2.6.16-rc6-updates.orig/arch/x86_64/ia32/sys_ia32.c
+++ linux-2.6.16-rc6-updates/arch/x86_64/ia32/sys_ia32.c
@@ -430,24 +430,12 @@ put_tv32(struct compat_timeval __user *o
 	return err; 
 }
 
-extern int do_setitimer(int which, struct itimerval *, struct itimerval *);
+extern unsigned int alarm_setitimer(unsigned int seconds);
 
 asmlinkage long
 sys32_alarm(unsigned int seconds)
 {
-	struct itimerval it_new, it_old;
-	unsigned int oldalarm;
-
-	it_new.it_interval.tv_sec = it_new.it_interval.tv_usec = 0;
-	it_new.it_value.tv_sec = seconds;
-	it_new.it_value.tv_usec = 0;
-	do_setitimer(ITIMER_REAL, &it_new, &it_old);
-	oldalarm = it_old.it_value.tv_sec;
-	/* ehhh.. We can't return 0 if we have an alarm pending.. */
-	/* And we'd better return too much than too little anyway */
-	if (it_old.it_value.tv_usec)
-		oldalarm++;
-	return oldalarm;
+	return alarm_setitimer(seconds);
 }
 
 /* Translations due to time_t size differences.  Which affects all
Index: linux-2.6.16-rc6-updates/kernel/timer.c
===================================================================
--- linux-2.6.16-rc6-updates.orig/kernel/timer.c
+++ linux-2.6.16-rc6-updates/kernel/timer.c
@@ -955,19 +955,7 @@ void do_timer(struct pt_regs *regs)
  */
 asmlinkage unsigned long sys_alarm(unsigned int seconds)
 {
-	struct itimerval it_new, it_old;
-	unsigned int oldalarm;
-
-	it_new.it_interval.tv_sec = it_new.it_interval.tv_usec = 0;
-	it_new.it_value.tv_sec = seconds;
-	it_new.it_value.tv_usec = 0;
-	do_setitimer(ITIMER_REAL, &it_new, &it_old);
-	oldalarm = it_old.it_value.tv_sec;
-	/* ehhh.. We can't return 0 if we have an alarm pending.. */
-	/* And we'd better return too much than too little anyway */
-	if ((!oldalarm && it_old.it_value.tv_usec) || it_old.it_value.tv_usec >= 500000)
-		oldalarm++;
-	return oldalarm;
+	return alarm_setitimer(seconds);
 }
 
 #endif
Index: linux-2.6.16-rc6-updates/include/linux/time.h
===================================================================
--- linux-2.6.16-rc6-updates.orig/include/linux/time.h
+++ linux-2.6.16-rc6-updates/include/linux/time.h
@@ -101,6 +101,7 @@ extern long do_utimes(int dfd, char __us
 struct itimerval;
 extern int do_setitimer(int which, struct itimerval *value,
 			struct itimerval *ovalue);
+extern unsigned int alarm_setitimer(unsigned int seconds);
 extern int do_getitimer(int which, struct itimerval *value);
 extern void getnstimeofday(struct timespec *tv);
 

--

