linux-kernel - Re: [PATCH -next v2 6/6] landlock: update chmod and chown support in document

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Date:   Mon, 29 Aug 2022 09:52:54 +0800
From:   xiujianfeng <xiujianfeng@...wei.com>
To:     Günther Noack <gnoack3000@...il.com>
CC:     <mic@...ikod.net>, <paul@...l-moore.com>, <jmorris@...ei.org>,
        <serge@...lyn.com>, <shuah@...nel.org>, <corbet@....net>,
        <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 v2 6/6] landlock: update chmod and chown support in
 document

Hi,

在 2022/8/28 1:28, Günther Noack 写道:
> On Sat, Aug 27, 2022 at 07:12:15PM +0800, Xiu Jianfeng wrote:
>> update LANDLOCK_ACCESS_FS_{CHMOD, CHGRP} support and add abi change
>> in the document.
>>
>> Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
>> ---
>>   Documentation/userspace-api/landlock.rst | 9 ++++++++-
>>   1 file changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/userspace-api/landlock.rst b/Documentation/userspace-api/landlock.rst
>> index 2509c2fbf98f..0e97a7998fa1 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_CHGRP
>>       };
>>
>>   Because we may not know on which kernel version an application will be
>> @@ -90,6 +92,11 @@ the ABI.
>>       case 2:
>>               /* Removes LANDLOCK_ACCESS_FS_TRUNCATE for ABI < 3 */
>>               ruleset_attr.handled_access_fs &= ~LANDLOCK_ACCESS_FS_TRUNCATE;
>> +            __attribute__((fallthrough));
>> +    case 3:
>> +            /* Removes LANDLOCK_ACCESS_FS_{CHMOD, CHGRP} for ABI < 4 */
>> +            ruleset_attr.handled_access_fs &= ~(LANDLOCK_ACCESS_FS_CHMOD |
>> +                                                LANDLOCK_ACCESS_FS_CHGRP);
>>       }
>>
>>   This enables to create an inclusive ruleset that will contain our rules.
> 
> There is a sentence just above this code example that neesd updating as well.
> 

Get it, it's the follwing sentence, thanks.
...
Let's check if we should
remove the `LANDLOCK_ACCESS_FS_REFER` or `LANDLOCK_ACCESS_FS_TRUNCATE` 
access
rights, which are only supported starting with the second and third 
version of
the ABI.
...

> --
> .
>