Re: [PATCH v1 2/2] kselftest: vm: add tests for memory-deny-write-execute

[Kees Cook <keescook@xxxxxxxxxxxx>]

On Wed, Oct 26, 2022 at 04:04:57PM +0100, Joey Gouly wrote:
> [...]
> +# define PR_MDWE_FLAG_MMAP              1
> [...]
> +	// Enable MDWE and then run the tests again.
> +	ret = prctl(PR_SET_MDWE, PR_MDWE_FLAG_MMAP, 0, 0, 0);
> +	if (ret < 0) {
> +		ksft_print_msg("PR_SET_MDWE failed or unsupported!\n");
> +		goto exit;
> +	}
> +
> +	ret = prctl(PR_GET_MDWE, PR_MDWE_FLAG_MMAP, 0, 0, 0);
> +	if (ret == 0)
> +		ksft_exit_fail_msg("PR_GET_MDWE failed!");

This flag (PR_MDWE_FLAG_MMAP), while defined in uapi, wasn't actually
being used in the proposed prctl() api. :)

-- 
Kees Cook