diff options
| author | Deepa Dinamani <deepa.kernel@gmail.com> | 2017-06-24 20:45:02 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-06-26 03:58:46 +0200 |
| commit | f59dd9c886acb3abb188e8e94a99436560976835 (patch) | |
| tree | 710c0991d9c08ef76eb60632ca2730bf59d9172b /kernel/compat.c | |
| parent | posix-timers: Make nanosleep timespec argument const (diff) | |
| download | linux-f59dd9c886acb3abb188e8e94a99436560976835.tar.xz linux-f59dd9c886acb3abb188e8e94a99436560976835.zip | |
time: add get_timespec64 and put_timespec64
Add helper functions to convert between struct timespec64 and
struct timespec at userspace boundaries.
This is a preparatory patch to use timespec64 as the basic type
internally in the kernel as timespec is not y2038 safe on 32 bit systems.
The patch helps the cause by containing all data conversions at the
userspace boundaries within these functions.
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel/compat.c')
| -rw-r--r-- | kernel/compat.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/kernel/compat.c b/kernel/compat.c index ebd8bdc3fd68..73f26ba44a8a 100644 --- a/kernel/compat.c +++ b/kernel/compat.c @@ -120,6 +120,50 @@ 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 *ts64, + const struct compat_timespec __user *cts) +{ + struct compat_timespec ts; + int ret; + + ret = copy_from_user(&ts, cts, sizeof(ts)); + if (ret) + return -EFAULT; + + ts64->tv_sec = ts.tv_sec; + ts64->tv_nsec = ts.tv_nsec; + + return 0; +} + +static int __compat_put_timespec64(const struct timespec64 *ts64, + struct compat_timespec __user *cts) +{ + struct compat_timespec ts = { + .tv_sec = ts64->tv_sec, + .tv_nsec = ts64->tv_nsec + }; + return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0; +} + +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); + int compat_get_timeval(struct timeval *tv, const void __user *utv) { if (COMPAT_USE_64BIT_TIME) |