netdev - Re: [PATCH v7 02/18] landlock: refactor landlock_find_rule/insert

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Date:   Fri, 9 Sep 2022 13:48:46 +0300
From:   "Konstantin Meskhidze (A)" <konstantin.meskhidze@...wei.com>
To:     Mickaël Salaün <mic@...ikod.net>
CC:     <willemdebruijn.kernel@...il.com>, <gnoack3000@...il.com>,
        <linux-security-module@...r.kernel.org>, <netdev@...r.kernel.org>,
        <netfilter-devel@...r.kernel.org>, <anton.sirazetdinov@...wei.com>
Subject: Re: [PATCH v7 02/18] landlock: refactor
 landlock_find_rule/insert_rule



9/6/2022 11:07 AM, Mickaël Salaün пишет:
> Good to see such clean commit!
> 
> On 29/08/2022 19:03, Konstantin Meskhidze wrote:
>> Adds a new landlock_key union and landlock_id structure to support
>> a socket port rule type. Refactors landlock_insert_rule() and
>> landlock_find_rule() to support coming network modifications.
> 
>> This patch also adds is_object_pointer() and get_root() helpers.
> 
> Please explain a bit what these helpers do.
> 
   Ok. I will fix it.
> 
>> Now adding or searching a rule in a ruleset depends on a landlock id
>> argument provided in refactored functions mentioned above.
> 
> More explanation:
> A struct landlock_id identifies a unique entry in a ruleset: either a
> kernel object (e.g inode) or a typed data (e.g. TCP port). There is one
> red-black tree per key type.
> 
    Got it.
>> 
>> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
> 
> Because most changes come from
> https://git.kernel.org/mic/c/8f4104b3dc59e7f110c9b83cdf034d010a2d006f
> and
> https://git.kernel.org/mic/c/7d6cf40a6f81adf607ad3cc17aaa11e256beeea4
> you can append
> Co-developed-by: Mickaël Salaün <mic@...ikod.net>
> 

  Ok. Thank you for help here.

>> ---
>> 
>> Changes since v6:
>> * Adds union landlock_key, enum landlock_key_type, and struct
>>    landlock_id.
>> * Refactors ruleset functions and improves switch/cases: create_rule(),
>>    insert_rule(), get_root(), is_object_pointer(), free_rule(),
>>    landlock_find_rule().
>> * Refactors landlock_append_fs_rule() functions to support new
>>    landlock_id type.
>> 
>> Changes since v5:
>> * Formats code with clang-format-14.
>> 
>> Changes since v4:
>> * Refactors insert_rule() and create_rule() functions by deleting
>> rule_type from their arguments list, it helps to reduce useless code.
>> 
>> Changes since v3:
>> * Splits commit.
>> * Refactors landlock_insert_rule and landlock_find_rule functions.
>> * Rename new_ruleset->root_inode.
>> 
>> ---
>>   security/landlock/fs.c      |  21 ++++--
>>   security/landlock/ruleset.c | 146 +++++++++++++++++++++++++-----------
>>   security/landlock/ruleset.h |  51 ++++++++++---
>>   3 files changed, 156 insertions(+), 62 deletions(-)
> 
> [...]
> 
>> diff --git a/security/landlock/ruleset.h b/security/landlock/ruleset.h
>> index 647d44284080..bb1408cc8dd2 100644
>> --- a/security/landlock/ruleset.h
>> +++ b/security/landlock/ruleset.h
>> @@ -49,6 +49,33 @@ struct landlock_layer {
>>   	access_mask_t access;
>>   };
>> 
>> +/**
>> + * union landlock_key - Key of a ruleset's red-black tree
>> + */
>> +union landlock_key {
>> +	struct landlock_object *object;
>> +	uintptr_t data;
>> +};
>> +
>> +/**
>> + * enum landlock_key_type - Type of &union landlock_key
>> + */
>> +enum landlock_key_type {
>> +	/**
>> +	 * @LANDLOCK_KEY_INODE: Type of &landlock_ruleset.root_inode's node
>> +	 * keys.
>> +	 */
>> +	LANDLOCK_KEY_INODE = 1,
>> +};
>> +
>> +/**
>> + * struct landlock_id - Unique rule identifier for a ruleset
>> + */
>> +struct landlock_id {
>> +	union landlock_key key;
>> +	const enum landlock_key_type type;
>> +};
> 
> You can add these new types to Documentation/security/landlock.rst (with
> this commit). You need to complete all the new field descriptions though
> (otherwise you'll get Sphinx warnings): object, data, key, type.

   Sorry I did not get this tip. Can you explain more detailed here, 
about Sphinx warnings?
> .