From 9d94b9e2f354f79461aa674e75b0926d0e768db6 Mon Sep 17 00:00:00 2001
From: Al Viro
Date: Thu, 27 Dec 2012 16:52:33 -0500
Subject: switch timerfd compat syscalls to COMPAT_SYSCALL_DEFINE

... and move them over to fs/timerfd.c.  Cleaner and easier
that way...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 fs/timerfd.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 66 insertions(+), 19 deletions(-)

(limited to 'fs/timerfd.c')

diff --git a/fs/timerfd.c b/fs/timerfd.c
index d03822bbf190..0e606b12a59d 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -22,6 +22,7 @@
 #include <linux/anon_inodes.h>
 #include <linux/timerfd.h>
 #include <linux/syscalls.h>
+#include <linux/compat.h>
 #include <linux/rcupdate.h>
 
 struct timerfd_ctx {
@@ -278,21 +279,17 @@ SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags)
 	return ufd;
 }
 
-SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
-		const struct itimerspec __user *, utmr,
-		struct itimerspec __user *, otmr)
+static int do_timerfd_settime(int ufd, int flags, 
+		const struct itimerspec *new,
+		struct itimerspec *old)
 {
 	struct fd f;
 	struct timerfd_ctx *ctx;
-	struct itimerspec ktmr, kotmr;
 	int ret;
 
-	if (copy_from_user(&ktmr, utmr, sizeof(ktmr)))
-		return -EFAULT;
-
 	if ((flags & ~TFD_SETTIME_FLAGS) ||
-	    !timespec_valid(&ktmr.it_value) ||
-	    !timespec_valid(&ktmr.it_interval))
+	    !timespec_valid(&new->it_value) ||
+	    !timespec_valid(&new->it_interval))
 		return -EINVAL;
 
 	ret = timerfd_fget(ufd, &f);
@@ -323,27 +320,23 @@ SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
 	if (ctx->expired && ctx->tintv.tv64)
 		hrtimer_forward_now(&ctx->tmr, ctx->tintv);
 
-	kotmr.it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
-	kotmr.it_interval = ktime_to_timespec(ctx->tintv);
+	old->it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
+	old->it_interval = ktime_to_timespec(ctx->tintv);
 
 	/*
 	 * Re-program the timer to the new value ...
 	 */
-	ret = timerfd_setup(ctx, flags, &ktmr);
+	ret = timerfd_setup(ctx, flags, new);
 
 	spin_unlock_irq(&ctx->wqh.lock);
 	fdput(f);
-	if (otmr && copy_to_user(otmr, &kotmr, sizeof(kotmr)))
-		return -EFAULT;
-
 	return ret;
 }
 
-SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct itimerspec __user *, otmr)
+static int do_timerfd_gettime(int ufd, struct itimerspec *t)
 {
 	struct fd f;
 	struct timerfd_ctx *ctx;
-	struct itimerspec kotmr;
 	int ret = timerfd_fget(ufd, &f);
 	if (ret)
 		return ret;
@@ -356,11 +349,65 @@ SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct itimerspec __user *, otmr)
 			hrtimer_forward_now(&ctx->tmr, ctx->tintv) - 1;
 		hrtimer_restart(&ctx->tmr);
 	}
-	kotmr.it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
-	kotmr.it_interval = ktime_to_timespec(ctx->tintv);
+	t->it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
+	t->it_interval = ktime_to_timespec(ctx->tintv);
 	spin_unlock_irq(&ctx->wqh.lock);
 	fdput(f);
+	return 0;
+}
+
+SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
+		const struct itimerspec __user *, utmr,
+		struct itimerspec __user *, otmr)
+{
+	struct itimerspec new, old;
+	int ret;
+
+	if (copy_from_user(&new, utmr, sizeof(new)))
+		return -EFAULT;
+	ret = do_timerfd_settime(ufd, flags, &new, &old);
+	if (ret)
+		return ret;
+	if (otmr && copy_to_user(otmr, &old, sizeof(old)))
+		return -EFAULT;
+
+	return ret;
+}
 
+SYSCALL_DEFINE2(timerfd_gettime, int, ufd, struct itimerspec __user *, otmr)
+{
+	struct itimerspec kotmr;
+	int ret = do_timerfd_gettime(ufd, &kotmr);
+	if (ret)
+		return ret;
 	return copy_to_user(otmr, &kotmr, sizeof(kotmr)) ? -EFAULT: 0;
 }
 
+#ifdef COMPAT
+COMPAT_SYSCALL_DEFINE4(timerfd_settime, int, ufd, int, flags,
+		const struct itimerspec __user *, utmr,
+		struct itimerspec __user *, otmr)
+{
+	struct itimerspec new, old;
+	int ret;
+
+	if (get_compat_itimerspec(&new, utmr))
+		return -EFAULT;
+	ret = do_timerfd_settime(ufd, flags, &new, &old);
+	if (ret)
+		return ret;
+	if (otmr && put_compat_itimerspec(otmr, &old))
+		return -EFAULT;
+	return ret;
+}
+
+COMPAT_SYSCALL_DEFINE2(timerfd_gettime, int, ufd,
+		struct itimerspec __user *, otmr)
+{
+	struct itimerspec kotmr;
+	int ret = do_timerfd_gettime(ufd, &kotmr);
+	if (ret)
+		return ret;
+	return put_compat_itimerspec(otmr, &t) ? -EFAULT: 0;
+}
+#endif
-- 
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