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Subject[PATCH 12/19] y2038: add compat_{get,put}_timespec64
Date
These are new helper functions that convert between a user compat_timespec
and a kernel timespec64 structure.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
include/linux/compat_time.h | 2 ++
kernel/compat.c | 32 ++++++++++++++++++++++++++++++++
2 files changed, 34 insertions(+)

diff --git a/include/linux/compat_time.h b/include/linux/compat_time.h
index e3b43bd79801..d91d0d9c753b 100644
--- a/include/linux/compat_time.h
+++ b/include/linux/compat_time.h
@@ -112,6 +112,8 @@ extern int compat_get_timespec(struct timespec *, const void __user *);
extern int compat_put_timespec(const struct timespec *, void __user *);
extern int compat_get_timeval(struct timeval *, const void __user *);
extern int compat_put_timeval(const struct timeval *, void __user *);
+extern int compat_get_timespec64(struct timespec64 *ts, const void __user *uts);
+extern int compat_put_timespec64(const struct timespec64 *ts, void __user *uts);

/*
* This function convert a timespec if necessary and returns a *user
diff --git a/kernel/compat.c b/kernel/compat.c
index e56ee6a23c0f..d8d0a4711cc7 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -157,6 +157,20 @@ static int __compat_put_timespec(const struct timespec *ts, struct compat_timesp
__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
}

+static int __compat_get_timespec64(struct timespec64 *ts, const struct compat_timespec __user *cts)
+{
+ return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
+ __get_user(ts->tv_sec, &cts->tv_sec) ||
+ __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
+}
+
+static int __compat_put_timespec64(const struct timespec64 *ts, struct compat_timespec __user *cts)
+{
+ return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
+ __put_user(ts->tv_sec, &cts->tv_sec) ||
+ __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
+}
+
int compat_get_timeval(struct timeval *tv, const void __user *utv)
{
if (COMPAT_USE_64BIT_TIME)
@@ -193,6 +207,24 @@ int compat_put_timespec(const struct timespec *ts, void __user *uts)
}
EXPORT_SYMBOL_GPL(compat_put_timespec);

+int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
+{
+ if (COMPAT_USE_64BIT_TIME)
+ return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
+ else
+ return __compat_get_timespec64(ts, uts);
+}
+EXPORT_SYMBOL_GPL(compat_get_timespec64);
+
+int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
+{
+ if (COMPAT_USE_64BIT_TIME)
+ return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
+ else
+ return __compat_put_timespec64(ts, uts);
+}
+EXPORT_SYMBOL_GPL(compat_put_timespec64);
+
#ifdef CONFIG_COMPAT
int compat_convert_timespec(struct timespec __user **kts,
const void __user *cts)
--
2.1.0.rc2


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