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Subject[PATCH v3 7/7] posix_clocks: Use get_itimerspec64() and put_itimerspec64()
Date
Usage of these apis and their compat versions makes
the syscalls: timer_settime and timer_gettime and their
compat implementations simpler.

This patch also serves as a preparatory patch for changing
syscalls to use new time_t data types to support the
y2038 effort by isolating the processing of user pointers
through these apis.

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
---
kernel/time/posix-timers.c | 44 ++++++++++++++++----------------------------
1 file changed, 16 insertions(+), 28 deletions(-)

diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 6818818caffd..5bcc87e19c97 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -739,13 +739,11 @@ static int do_timer_gettime(timer_t timer_id, struct itimerspec64 *setting)
SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
struct itimerspec __user *, setting)
{
- struct itimerspec64 cur_setting64;
+ struct itimerspec64 cur_setting;

- int ret = do_timer_gettime(timer_id, &cur_setting64);
+ int ret = do_timer_gettime(timer_id, &cur_setting);
if (!ret) {
- struct itimerspec cur_setting;
- cur_setting = itimerspec64_to_itimerspec(&cur_setting64);
- if (copy_to_user(setting, &cur_setting, sizeof (cur_setting)))
+ if (put_itimerspec64(&cur_setting, setting))
ret = -EFAULT;
}
return ret;
@@ -755,13 +753,11 @@ SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
struct compat_itimerspec __user *, setting)
{
- struct itimerspec64 cur_setting64;
+ struct itimerspec64 cur_setting;

- int ret = do_timer_gettime(timer_id, &cur_setting64);
+ int ret = do_timer_gettime(timer_id, &cur_setting);
if (!ret) {
- struct itimerspec cur_setting;
- cur_setting = itimerspec64_to_itimerspec(&cur_setting64);
- if (put_compat_itimerspec(setting, &cur_setting))
+ if (put_compat_itimerspec64(&cur_setting, setting))
ret = -EFAULT;
}
return ret;
@@ -907,23 +903,19 @@ SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
const struct itimerspec __user *, new_setting,
struct itimerspec __user *, old_setting)
{
- struct itimerspec64 new_spec64, old_spec64;
- struct itimerspec64 *rtn = old_setting ? &old_spec64 : NULL;
- struct itimerspec new_spec;
+ struct itimerspec64 new_spec, old_spec;
+ struct itimerspec64 *rtn = old_setting ? &old_spec : NULL;
int error = 0;

if (!new_setting)
return -EINVAL;

- if (copy_from_user(&new_spec, new_setting, sizeof (new_spec)))
+ if (get_itimerspec64(&new_spec, new_setting))
return -EFAULT;
- new_spec64 = itimerspec_to_itimerspec64(&new_spec);

- error = do_timer_settime(timer_id, flags, &new_spec64, rtn);
+ error = do_timer_settime(timer_id, flags, &new_spec, rtn);
if (!error && old_setting) {
- struct itimerspec old_spec;
- old_spec = itimerspec64_to_itimerspec(&old_spec64);
- if (copy_to_user(old_setting, &old_spec, sizeof (old_spec)))
+ if (put_itimerspec64(&old_spec, old_setting))
error = -EFAULT;
}
return error;
@@ -934,22 +926,18 @@ COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
struct compat_itimerspec __user *, new,
struct compat_itimerspec __user *, old)
{
- struct itimerspec64 new_spec64, old_spec64;
- struct itimerspec64 *rtn = old ? &old_spec64 : NULL;
- struct itimerspec new_spec;
+ struct itimerspec64 new_spec, old_spec;
+ struct itimerspec64 *rtn = old ? &old_spec : NULL;
int error = 0;

if (!new)
return -EINVAL;
- if (get_compat_itimerspec(&new_spec, new))
+ if (get_compat_itimerspec64(&new_spec, new))
return -EFAULT;

- new_spec64 = itimerspec_to_itimerspec64(&new_spec);
- error = do_timer_settime(timer_id, flags, &new_spec64, rtn);
+ error = do_timer_settime(timer_id, flags, &new_spec, rtn);
if (!error && old) {
- struct itimerspec old_spec;
- old_spec = itimerspec64_to_itimerspec(&old_spec64);
- if (put_compat_itimerspec(old, &old_spec))
+ if (put_compat_itimerspec64(&old_spec, old))
error = -EFAULT;
}
return error;
--
2.11.0
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