netdev - Re: [PATCH v7 01/18] landlock: rename access mask

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Date:   Tue, 6 Sep 2022 10:06:57 +0200
From:   Mickaël Salaün <mic@...ikod.net>
To:     Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
Cc:     willemdebruijn.kernel@...il.com, gnoack3000@...il.com,
        linux-security-module@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, yusongping@...wei.com,
        hukeping@...wei.com, anton.sirazetdinov@...wei.com
Subject: Re: [PATCH v7 01/18] landlock: rename access mask

You can improve the subject with "landlock: Make ruleset's access masks 
more generic".
Please capitalize all subjects this way.

On 29/08/2022 19:03, Konstantin Meskhidze wrote:
> To support network type rules, this modification renames ruleset's
> access masks and modifies it's type to access_masks_t. This patch
> adds filesystem helper functions to add and get filesystem mask.
> 
> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
> ---
> 
> Changes since v6:
> * Adds a new access_masks_t for struct ruleset.
> * Renames landlock_set_fs_access_mask() to landlock_add_fs_access_mask()
>    because it OR values.
> * Makes landlock_add_fs_access_mask() more resilient incorrect values.
> * Refactors landlock_get_fs_access_mask().
> 
> Changes since v5:
> * Changes access_mask_t to u32.
> * Formats code with clang-format-14.
> 
> Changes since v4:
> * Deletes struct landlock_access_mask.
> 
> Changes since v3:
> * Splits commit.
> * Adds get_mask, set_mask helpers for filesystem.
> * Adds new struct landlock_access_mask.
> 
> ---
>   security/landlock/fs.c       |  7 ++++---
>   security/landlock/limits.h   |  1 +
>   security/landlock/ruleset.c  | 17 +++++++++--------
>   security/landlock/ruleset.h  | 37 ++++++++++++++++++++++++++++++++----
>   security/landlock/syscalls.c |  7 ++++---
>   5 files changed, 51 insertions(+), 18 deletions(-)

[...]

> @@ -177,4 +182,28 @@ static inline void landlock_get_ruleset(struct landlock_ruleset *const ruleset)
>   		refcount_inc(&ruleset->usage);
>   }
> 
> +/* A helper function to set a filesystem mask. */
> +static inline void
> +landlock_add_fs_access_mask(struct landlock_ruleset *const ruleset,
> +			    const access_mask_t fs_access_mask,
> +			    const u16 layer_level)
> +{
> +	access_mask_t fs_mask = fs_access_mask & LANDLOCK_MASK_ACCESS_FS;
> +
> +	/* Should already be checked in sys_landlock_create_ruleset(). */
> +	WARN_ON_ONCE(fs_access_mask != fs_mask);
> +	// TODO: Add tests to check "|=" and not "="

Please add tests as I explained in a previous email.