On Tue, Feb 11, 2020 at 12:02 PM Vineet Gupta <vineetg76@xxxxxxxxx> wrote:
>
> Hi Alistair,
>
> On 2/10/20 9:43 AM, Alistair Francis wrote:
> > The Linux kernel expects itimerval to use a 32-bit time_t, even on archs
> > with a 64-bit time_t (like RV32). To address this let's convert
> > itimerval to/from 32-bit and 64-bit to ensure the kernel always gets
> > a 32-bit time_t.
> >
> > While we are converting these functions let's also convert them to be
> > the y2038 safe versions. This means there is a *64 function that is
> > called by a backwards compatible wrapper.
> > ---
>
> > +
> > +int
> > +__setitimer64 (__itimer_which_t which,
> > + const struct __itimerval64 *restrict new_value,
> > + struct __itimerval64 *restrict old_value)
> > +{
> > + struct __itimerval32 new_value_32;
> > +
> > + if (! in_time_t_range (new_value->it_interval.tv_sec))
> > + {
> > + __set_errno (EOVERFLOW);
> > + return -1;
> > + }
> > + new_value_32.it_interval
> > + = valid_timeval64_to_timeval32 (new_value->it_interval);
> > +
> > + if (! in_time_t_range (new_value->it_value.tv_sec))
> > + {
> > + __set_errno (EOVERFLOW);
> > + return -1;
> > + }
> > + new_value_32.it_value
> > + = valid_timeval64_to_timeval32 (new_value->it_value);
> > +
> > + if (old_value == NULL)
> > + return INLINE_SYSCALL_CALL (setitimer, which, &new_value_32, NULL);
> > +
> > + struct __itimerval32 old_value_32;
> > + if (INLINE_SYSCALL_CALL (setitimer, which, &new_value_32, &old_value_32) == -1)
> > + return -1;
> > +
> > + /* Write all fields of 'old_value' regardless of overflow. */
> > + old_value->it_interval
> > + = valid_timeval32_to_timeval64 (old_value_32.it_interval);
> > + old_value->it_value
> > + = valid_timeval32_to_timeval64 (old_value_32.it_value);
> > + return 0;
> > +}
> > +
> > +#if __TIMESIZE != 64
> > +int
> > +__setitimer (__itimer_which_t which,
> > + const struct itimerval *restrict new_value,
> > + struct itimerval *restrict old_value)
> > +{
> > + int ret;
> > + struct __itimerval64 new64, old64;
> > +
> > + new64.it_interval
> > + = valid_timeval_to_timeval64 (new_value->it_interval);
> > + new64.it_value
> > + = valid_timeval_to_timeval64 (new_value->it_value);
> > +
> > + ret = __setitimer64 (which, &new64, &old64);
> > +
> > + if (ret != 0)
> > + return ret;
>
> I tested ARC port over your v1 next branch and it works fine in general. I still
> had 32-bit time_t so you have some more test coverage ;-)
>
> The glibc testsuite had some new failures, some of them are coming from the
> unchecked @old_value dereference (which would not hit for 64-bit time_t).
>
> Care to fix it please.
Fixed! Thanks for testing!
Alistair
>
> > +
> > + old_value->it_interval
> > + = valid_timeval64_to_timeval (old64.it_interval);
> > + old_value->it_value
> > + = valid_timeval64_to_timeval (old64.it_value);
> > +
> > + return ret;
> > +}
> > +#endif
> > +weak_alias (__setitimer, setitimer)
> Thx,
> -Vineet
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