Re: [igt-dev] [PATCH i-g-t 5/6] tests/kms_invalid_mode: Test clock==(U)INT_MAX

[Karthik B S <karthik.b.s@intel.com>]

On 9/16/2021 9:05 PM, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> Test against some big clock values to make sure we can't trick the
> kernel into bypassing the validation via an integer overflows/etc.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Karthik B S <karthik.b.s@intel.com>
> ---
>   tests/i915/kms_invalid_mode.c | 21 +++++++++++++++++++++
>   1 file changed, 21 insertions(+)
>
> diff --git a/tests/i915/kms_invalid_mode.c b/tests/i915/kms_invalid_mode.c
> index 6d56a378d141..722aa816fca1 100644
> --- a/tests/i915/kms_invalid_mode.c
> +++ b/tests/i915/kms_invalid_mode.c
> @@ -23,6 +23,7 @@
>    */
>   
>   #include "igt.h"
> +#include <limits.h>
>   #include <stdbool.h>
>   
>   IGT_TEST_DESCRIPTION("Make sure all modesets are rejected when the requested mode is invalid");
> @@ -107,6 +108,20 @@ adjust_mode_zero_clock(data_t *data, drmModeModeInfoPtr mode)
>   	return true;
>   }
>   
> +static bool
> +adjust_mode_int_max_clock(data_t *data, drmModeModeInfoPtr mode)
> +{
> +	mode->clock = INT_MAX;
> +	return true;
> +}
> +
> +static bool
> +adjust_mode_uint_max_clock(data_t *data, drmModeModeInfoPtr mode)
> +{
> +	mode->clock = UINT_MAX;
> +	return true;
> +}
> +
>   static bool
>   adjust_mode_zero_hdisplay(data_t *data, drmModeModeInfoPtr mode)
>   {
> @@ -244,6 +259,12 @@ static const struct {
>   	{ .name = "zero-clock",
>   	  .adjust_mode = adjust_mode_zero_clock,
>   	},
> +	{ .name = "int-max-clock",
> +	  .adjust_mode = adjust_mode_int_max_clock,
> +	},
> +	{ .name = "uint-max-clock",
> +	  .adjust_mode = adjust_mode_uint_max_clock,
> +	},
>   	{ .name = "zero-hdisplay",
>   	  .adjust_mode = adjust_mode_zero_hdisplay,
>   	},