Re: [Y2038] [PATCH v4 09/25] posix-timers:Change the implementation for timer_settime syscall

On Tuesday 26 May 2015 18:08:29 Baolin Wang wrote:

+SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,

•           const struct itimerspec __user *, new_setting,
  

•           struct itimerspec __user *, old_setting)
  

+{

•   struct itimerspec new_spec, old_spec;
  

•   int error = 0;
  

•   struct itimerspec *rtn = old_setting ? &old_spec : NULL;
  

•   if (!new_setting)
  

•           return -EINVAL;
  

•   if (copy_from_user(&new_spec, new_setting, sizeof (new_spec)))
  

•           return -EFAULT;
  

•   if (!timespec_valid(&new_spec.it_interval) ||
  

•       !timespec_valid(&new_spec.it_value))
  

•           return -EINVAL;
  

•   error = __timer_settime(timer_id, flags, &new_spec, rtn);
  

•   if (old_setting && !error &&
        copy_to_user(old_setting, &old_spec, sizeof (old_spec)))
            error = -EFAULT;
  
  

Since this is meant as preparation for adding the compat syscalls, I think the actual syscall code here should be as small as possible.

In order to do that, it would be better to have the timespec_valid calls inside of __timer_settime.

Arnd