[PATCH v4 2/3] landlock: Refactor network access mask management

[Günther Noack]

On Sat, Nov 09, 2024 at 12:08:55PM +0100, Mickaël Salaün wrote:
> Replace get_raw_handled_net_accesses() and get_current_net_domain() with
> a call to landlock_match_ruleset().
> 
> Cc: Günther Noack <gnoack at google.com>
> Cc: Konstantin Meskhidze <konstantin.meskhidze at huawei.com>
> Cc: Mikhail Ivanov <ivanov.mikhail1 at huawei-partners.com>
> Signed-off-by: Mickaël Salaün <mic at digikod.net>
> Link: https://lore.kernel.org/r/20241109110856.222842-3-mic@digikod.net
> ---
> 
> Changes since v2:
> * Replace get_current_net_domain() with explicit call to
>   landlock_match_ruleset().
> 
> Changes since v1:
> * Rename the all_net mask to any_net.
> ---
>  security/landlock/net.c | 28 ++++++----------------------
>  1 file changed, 6 insertions(+), 22 deletions(-)
> 
> diff --git a/security/landlock/net.c b/security/landlock/net.c
> index c8bcd29bde09..d5dcc4407a19 100644
> --- a/security/landlock/net.c
> +++ b/security/landlock/net.c
> @@ -39,27 +39,9 @@ int landlock_append_net_rule(struct landlock_ruleset *const ruleset,
>  	return err;
>  }
>  
> -static access_mask_t
> -get_raw_handled_net_accesses(const struct landlock_ruleset *const domain)
> -{
> -	access_mask_t access_dom = 0;
> -	size_t layer_level;
> -
> -	for (layer_level = 0; layer_level < domain->num_layers; layer_level++)
> -		access_dom |= landlock_get_net_access_mask(domain, layer_level);
> -	return access_dom;
> -}
> -
> -static const struct landlock_ruleset *get_current_net_domain(void)
> -{
> -	const struct landlock_ruleset *const dom =
> -		landlock_get_current_domain();
> -
> -	if (!dom || !get_raw_handled_net_accesses(dom))
> -		return NULL;
> -
> -	return dom;
> -}
> +static const struct access_masks any_net = {
> +	.net = ~0,
> +};
>  
>  static int current_check_access_socket(struct socket *const sock,
>  				       struct sockaddr *const address,
> @@ -72,7 +54,9 @@ static int current_check_access_socket(struct socket *const sock,
>  	struct landlock_id id = {
>  		.type = LANDLOCK_KEY_NET_PORT,
>  	};
> -	const struct landlock_ruleset *const dom = get_current_net_domain();
> +	const struct landlock_ruleset *const dom =
> +		landlock_get_applicable_domain(landlock_get_current_domain(),
> +					       any_net);
>  
>  	if (!dom)
>  		return 0;
> -- 
> 2.47.0
> 

Reviewed-by: Günther Noack <gnoack at google.com>

—Günther