Re: [PATCH 7/7] exec: Implement kernel_execve

[Kees Cook]

On Tue, Jul 14, 2020 at 08:31:40AM -0500, Eric W. Biederman wrote:
> +static int count_strings_kernel(const char *const *argv)
> +{
> +	int i;
> +
> +	if (!argv)
> +		return 0;
> +
> +	for (i = 0; argv[i]; ++i) {
> +		if (i >= MAX_ARG_STRINGS)
> +			return -E2BIG;
> +		if (fatal_signal_pending(current))
> +			return -ERESTARTNOHAND;
> +		cond_resched();
> +	}
> +	return i;
> +}

I notice count() is only ever called with MAX_ARG_STRINGS. Perhaps
refactor that too? (And maybe rename it to count_strings_user()?)

Otherwise, looks good:

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-- 
Kees Cook