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.
> +
> + 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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