From: "Konstantin Meskhidze (A)" <konstantin.meskhidze@huawei•com>
To: "Mickaël Salaün" <mic@digikod•net>
Cc: <willemdebruijn.kernel@gmail•com>, <gnoack3000@gmail•com>,
<linux-security-module@vger•kernel.org>, <netdev@vger•kernel.org>,
<netfilter-devel@vger•kernel.org>, <artem.kuzin@huawei•com>
Subject: Re: [PATCH v8 03/12] landlock: Refactor merge/inherit_ruleset functions
Date: Mon, 28 Nov 2022 06:07:41 +0300 [thread overview]
Message-ID: <72e8356b-e316-0289-2316-059e4fc58bef@huawei.com> (raw)
In-Reply-To: <85898d3b-9ef6-6fb7-6d9b-d6766a58b9ab@digikod.net>
11/17/2022 9:41 PM, Mickaël Salaün пишет:
>
> On 21/10/2022 17:26, Konstantin Meskhidze wrote:
>> Refactors merge_ruleset() and inherit_ruleset() functions to support
>
> Refactor…
Ok. Thanks.
>
>> new rule types. This patch adds merge_tree() and inherit_tree()
>> helpers.
>
>> Each has key_type argument to choose a particular rb_tree
>
> They use a specific ruleset's red-black tree according to a key type
> argument.
Got it.
>
>> structure in a ruleset.
>>
>> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@huawei•com>
>> ---
>>
>> Changes since v7:
>> * Adds missed lockdep_assert_held it inherit_tree() and merge_tree().
>> * Fixes comment.
>>
>> Changes since v6:
>> * Refactors merge_ruleset() and inherit_ruleset() functions to support
>> new rule types.
>> * Renames tree_merge() to merge_tree() (and reorder arguments), and
>> tree_copy() to inherit_tree().
>>
>> Changes since v5:
>> * Refactors some logic errors.
>> * Formats code with clang-format-14.
>>
>> Changes since v4:
>> * None
>>
>> ---
>> security/landlock/ruleset.c | 108 ++++++++++++++++++++++++------------
>> 1 file changed, 73 insertions(+), 35 deletions(-)
>>
>> diff --git a/security/landlock/ruleset.c b/security/landlock/ruleset.c
>> index 41de17d1869e..961ffe0c709e 100644
>> --- a/security/landlock/ruleset.c
>> +++ b/security/landlock/ruleset.c
>> @@ -302,36 +302,22 @@ static void put_hierarchy(struct landlock_hierarchy *hierarchy)
>> }
>> }
>>
>> -static int merge_ruleset(struct landlock_ruleset *const dst,
>> - struct landlock_ruleset *const src)
>> +static int merge_tree(struct landlock_ruleset *const dst,
>> + struct landlock_ruleset *const src,
>> + const enum landlock_key_type key_type)
>> {
>> struct landlock_rule *walker_rule, *next_rule;
>> struct rb_root *src_root;
>> int err = 0;
>>
>> might_sleep();
>> - /* Should already be checked by landlock_merge_ruleset() */
>> - if (WARN_ON_ONCE(!src))
>> - return 0;
>> - /* Only merge into a domain. */
>> - if (WARN_ON_ONCE(!dst || !dst->hierarchy))
>> - return -EINVAL;
>> + lockdep_assert_held(&dst->lock);
>> + lockdep_assert_held(&src->lock);
>>
>> - src_root = get_root(src, LANDLOCK_KEY_INODE);
>> + src_root = get_root(src, key_type);
>> if (IS_ERR(src_root))
>> return PTR_ERR(src_root);
>>
>> - /* Locks @dst first because we are its only owner. */
>> - mutex_lock(&dst->lock);
>> - mutex_lock_nested(&src->lock, SINGLE_DEPTH_NESTING);
>> -
>> - /* Stacks the new layer. */
>> - if (WARN_ON_ONCE(src->num_layers != 1 || dst->num_layers < 1)) {
>> - err = -EINVAL;
>> - goto out_unlock;
>> - }
>> - dst->access_masks[dst->num_layers - 1] = src->access_masks[0];
>> -
>> /* Merges the @src tree. */
>> rbtree_postorder_for_each_entry_safe(walker_rule, next_rule, src_root,
>> node) {
>> @@ -340,7 +326,7 @@ static int merge_ruleset(struct landlock_ruleset *const dst,
>> } };
>> const struct landlock_id id = {
>> .key = walker_rule->key,
>> - .type = LANDLOCK_KEY_INODE,
>> + .type = key_type,
>> };
>>
>> if (WARN_ON_ONCE(walker_rule->num_layers != 1))
>> @@ -351,8 +337,39 @@ static int merge_ruleset(struct landlock_ruleset *const dst,
>>
>> err = insert_rule(dst, id, &layers, ARRAY_SIZE(layers));
>> if (err)
>> - goto out_unlock;
>> + return err;
>> + }
>> + return err;
>> +}
>> +
>> +static int merge_ruleset(struct landlock_ruleset *const dst,
>> + struct landlock_ruleset *const src)
>> +{
>> + int err = 0;
>> +
>> + might_sleep();
>> + /* Should already be checked by landlock_merge_ruleset() */
>> + if (WARN_ON_ONCE(!src))
>> + return 0;
>> + /* Only merge into a domain. */
>> + if (WARN_ON_ONCE(!dst || !dst->hierarchy))
>> + return -EINVAL;
>> +
>> + /* Locks @dst first because we are its only owner. */
>> + mutex_lock(&dst->lock);
>> + mutex_lock_nested(&src->lock, SINGLE_DEPTH_NESTING);
>> +
>> + /* Stacks the new layer. */
>> + if (WARN_ON_ONCE(src->num_layers != 1 || dst->num_layers < 1)) {
>> + err = -EINVAL;
>> + goto out_unlock;
>> }
>> + dst->access_masks[dst->num_layers - 1] = src->access_masks[0];
>> +
>> + /* Merges the @src inode tree. */
>> + err = merge_tree(dst, src, LANDLOCK_KEY_INODE);
>> + if (err)
>> + goto out_unlock;
>>
>> out_unlock:
>> mutex_unlock(&src->lock);
>> @@ -360,43 +377,64 @@ static int merge_ruleset(struct landlock_ruleset *const dst,
>> return err;
>> }
>>
>> -static int inherit_ruleset(struct landlock_ruleset *const parent,
>> - struct landlock_ruleset *const child)
>> +static int inherit_tree(struct landlock_ruleset *const parent,
>> + struct landlock_ruleset *const child,
>> + const enum landlock_key_type key_type)
>> {
>> struct landlock_rule *walker_rule, *next_rule;
>> struct rb_root *parent_root;
>> int err = 0;
>>
>> might_sleep();
>> - if (!parent)
>> - return 0;
>> + lockdep_assert_held(&parent->lock);
>> + lockdep_assert_held(&parent->lock);
>
> lockdep_assert_held(&child->lock);
My mistake. Thanks.
> .
next prev parent reply other threads:[~2022-11-28 3:07 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-21 15:26 [PATCH v8 00/12] Network support for Landlock Konstantin Meskhidze
2022-10-21 15:26 ` [PATCH v8 01/12] landlock: Make ruleset's access masks more generic Konstantin Meskhidze
2022-11-17 18:41 ` Mickaël Salaün
2022-11-28 2:53 ` Konstantin Meskhidze (A)
2022-11-28 20:22 ` Mickaël Salaün
2022-12-02 2:49 ` Konstantin Meskhidze (A)
2022-10-21 15:26 ` [PATCH v8 02/12] landlock: Refactor landlock_find_rule/insert_rule Konstantin Meskhidze
2022-11-17 18:41 ` Mickaël Salaün
2022-11-17 18:55 ` [PATCH] landlock: Allow filesystem layout changes for domains without such rule type Mickaël Salaün
2022-11-18 9:16 ` Mickaël Salaün
2022-11-28 3:04 ` Konstantin Meskhidze (A)
2022-11-28 20:23 ` Mickaël Salaün
2022-12-02 2:50 ` Konstantin Meskhidze (A)
2022-12-24 3:10 ` Konstantin Meskhidze (A)
2022-12-26 21:24 ` Mickaël Salaün
2022-12-27 1:47 ` Konstantin Meskhidze (A)
2022-11-28 3:02 ` Konstantin Meskhidze (A)
2022-11-28 20:25 ` Mickaël Salaün
2022-12-02 2:51 ` Konstantin Meskhidze (A)
2022-11-22 17:17 ` [PATCH v8 02/12] landlock: Refactor landlock_find_rule/insert_rule Mickaël Salaün
2022-11-28 3:06 ` Konstantin Meskhidze (A)
2022-11-28 2:58 ` Konstantin Meskhidze (A)
2022-10-21 15:26 ` [PATCH v8 03/12] landlock: Refactor merge/inherit_ruleset functions Konstantin Meskhidze
2022-11-17 18:41 ` Mickaël Salaün
2022-11-28 3:07 ` Konstantin Meskhidze (A) [this message]
2022-10-21 15:26 ` [PATCH v8 04/12] landlock: Move unmask_layers() and init_layer_masks() Konstantin Meskhidze
2022-11-17 18:42 ` Mickaël Salaün
2022-11-28 3:25 ` Konstantin Meskhidze (A)
2022-11-28 20:25 ` Mickaël Salaün
2022-12-02 2:52 ` Konstantin Meskhidze (A)
2022-10-21 15:26 ` [PATCH v8 05/12] landlock: Refactor " Konstantin Meskhidze
2022-11-17 18:42 ` Mickaël Salaün
2022-11-28 3:30 ` Konstantin Meskhidze (A)
2022-10-21 15:26 ` [PATCH v8 06/12] landlock: Refactor landlock_add_rule() syscall Konstantin Meskhidze
2022-11-17 18:42 ` Mickaël Salaün
2022-11-28 3:32 ` Konstantin Meskhidze (A)
2022-10-21 15:26 ` [PATCH v8 07/12] landlock: Add network rules support Konstantin Meskhidze
2022-11-17 18:43 ` Mickaël Salaün
2022-11-28 4:01 ` Konstantin Meskhidze (A)
2022-11-28 20:26 ` Mickaël Salaün
2022-12-02 2:54 ` Konstantin Meskhidze (A)
2023-01-03 12:44 ` Konstantin Meskhidze (A)
2023-01-04 11:41 ` Konstantin Meskhidze (A)
2023-01-06 19:22 ` Mickaël Salaün
2023-01-09 7:59 ` Konstantin Meskhidze (A)
2023-01-09 8:58 ` Dan Carpenter
2023-01-09 9:26 ` Konstantin Meskhidze (A)
2023-01-09 10:20 ` Dan Carpenter
2023-01-09 11:39 ` Konstantin Meskhidze (A)
2023-01-09 11:53 ` Dan Carpenter
2023-01-09 12:18 ` Konstantin Meskhidze (A)
2022-10-21 15:26 ` [PATCH v8 08/12] landlock: Implement TCP network hooks Konstantin Meskhidze
2022-11-17 18:43 ` Mickaël Salaün
2022-11-28 8:21 ` Konstantin Meskhidze (A)
2022-11-28 21:00 ` Mickaël Salaün
2022-12-02 3:13 ` Konstantin Meskhidze (A)
2022-12-02 13:01 ` Mickaël Salaün
2022-12-05 2:55 ` Konstantin Meskhidze (A)
2022-12-05 13:18 ` Mickaël Salaün
2023-01-05 8:57 ` Konstantin Meskhidze (A)
2023-01-06 19:30 ` Mickaël Salaün
2023-01-09 8:07 ` Konstantin Meskhidze (A)
2023-01-09 12:38 ` Mickaël Salaün
2023-01-10 4:45 ` Konstantin Meskhidze (A)
2023-01-10 17:24 ` Mickaël Salaün
2023-01-11 1:54 ` Konstantin Meskhidze (A)
2022-10-21 15:26 ` [PATCH v8 09/12] selftests/landlock: Share enforce_ruleset() Konstantin Meskhidze
2022-11-17 18:43 ` Mickaël Salaün
2022-11-28 4:02 ` Konstantin Meskhidze (A)
2022-10-21 15:26 ` [PATCH v8 10/12] selftests/landlock: Add 10 new test suites dedicated to network Konstantin Meskhidze
2023-01-09 12:46 ` Mickaël Salaün
2023-01-10 5:03 ` Konstantin Meskhidze (A)
2023-01-10 17:40 ` Mickaël Salaün
2023-01-11 1:52 ` Konstantin Meskhidze (A)
2022-10-21 15:26 ` [PATCH v8 11/12] samples/landlock: Add network demo Konstantin Meskhidze
2022-11-16 14:25 ` Mickaël Salaün
2022-11-28 2:49 ` Konstantin Meskhidze (A)
2022-11-28 20:26 ` Mickaël Salaün
2022-12-02 2:48 ` Konstantin Meskhidze (A)
2023-01-05 3:46 ` Konstantin Meskhidze (A)
2023-01-06 19:34 ` Mickaël Salaün
2023-01-09 7:57 ` Konstantin Meskhidze (A)
2022-10-21 15:26 ` [PATCH v8 12/12] landlock: Document Landlock's network support Konstantin Meskhidze
2022-11-17 18:44 ` Mickaël Salaün
2022-11-28 6:44 ` Konstantin Meskhidze (A)
2022-11-28 20:26 ` Mickaël Salaün
2022-12-02 3:14 ` Konstantin Meskhidze (A)
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