linux-kernel - Re: [PATCH -next 5/5] landlock: update chmod and chown support in document

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Date:   Mon, 22 Aug 2022 23:25:35 +0200
From:   Mickaël Salaün <mic@...ikod.net>
To:     Xiu Jianfeng <xiujianfeng@...wei.com>, paul@...l-moore.com,
        jmorris@...ei.org, serge@...lyn.com, shuah@...nel.org,
        corbet@....net
Cc:     linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH -next 5/5] landlock: update chmod and chown support in
 document


On 22/08/2022 13:47, Xiu Jianfeng wrote:
> update LANDLOCK_ACCESS_FS_{CHMOD, CHOWN} support and add abi change
> in the document.
> 
> Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
> ---
>   Documentation/userspace-api/landlock.rst | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/userspace-api/landlock.rst b/Documentation/userspace-api/landlock.rst
> index 2509c2fbf98f..05ab338db529 100644
> --- a/Documentation/userspace-api/landlock.rst
> +++ b/Documentation/userspace-api/landlock.rst
> @@ -61,7 +61,9 @@ the need to be explicit about the denied-by-default access rights.
>               LANDLOCK_ACCESS_FS_MAKE_BLOCK |
>               LANDLOCK_ACCESS_FS_MAKE_SYM |
>               LANDLOCK_ACCESS_FS_REFER |
> -            LANDLOCK_ACCESS_FS_TRUNCATE,
> +            LANDLOCK_ACCESS_FS_TRUNCATE |
> +            LANDLOCK_ACCESS_FS_CHMOD |
> +            LANDLOCK_ACCESS_FS_CHOWN
>       };
>   
>   Because we may not know on which kernel version an application will be
> @@ -90,6 +92,10 @@ the ABI.
>       case 2:
>               /* Removes LANDLOCK_ACCESS_FS_TRUNCATE for ABI < 3 */
>               ruleset_attr.handled_access_fs &= ~LANDLOCK_ACCESS_FS_TRUNCATE;

There is a missing fall-through attribute here.


> +    case 3:
> +            /* Removes LANDLOCK_ACCESS_FS_{CHMOD, CHOWN} for ABI < 4 */
> +            ruleset_attr.handled_access_fs &= ~(LANDLOCK_ACCESS_FS_CHMOD |
> +                                                LANDLOCK_ACCESS_FS_CHOWN);
>       }
>   
>   This enables to create an inclusive ruleset that will contain our rules.