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Date: Wed, 5 Jul 2023 12:16:52 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: "Konstantin Meskhidze (A)" <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,
artem.kuzin@...wei.com
Subject: Re: [PATCH v11 04/12] landlock: Refactor merge/inherit_ruleset
functions
On 01/07/2023 16:52, Konstantin Meskhidze (A) wrote:
>
>
> 6/26/2023 9:40 PM, Mickaël Salaün пишет:
>>
>> On 15/05/2023 18:13, Konstantin Meskhidze wrote:
>>> Refactor merge_ruleset() and inherit_ruleset() functions to support
>>> new rule types. This patch adds merge_tree() and inherit_tree()
>>> helpers. They use a specific ruleset's red-black tree according to
>>> a key type argument.
>>>
>>> Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
>>> ---
>>>
>>> Changes since v10:
>>> * Refactors merge_tree() function.
>>>
>>> Changes since v9:
>>> * None
>>>
>>> Changes since v8:
>>> * Refactors commit message.
>>> * Minor fixes.
>>>
>>> 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 | 122 +++++++++++++++++++++++-------------
>>> 1 file changed, 79 insertions(+), 43 deletions(-)
>>>
>>> diff --git a/security/landlock/ruleset.c b/security/landlock/ruleset.c
>>> index deab37838f5b..e4f449fdd6dd 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) {
>>> @@ -340,23 +326,52 @@ 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)) {
>>> - err = -EINVAL;
>>> - goto out_unlock;
>>> - }
>>> - if (WARN_ON_ONCE(walker_rule->layers[0].level != 0)) {
>>> - err = -EINVAL;
>>> - goto out_unlock;
>>> - }
>>> + if (WARN_ON_ONCE(walker_rule->num_layers != 1))
>>> + return -EINVAL;
>>> +
>>> + if (WARN_ON_ONCE(walker_rule->layers[0].level != 0))
>>> + return -EINVAL;
>>> +
>>> layers[0].access = walker_rule->layers[0].access;
>>>
>>> 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);
>>> @@ -364,43 +379,64 @@ 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(&child->lock);
>>>
>>> - parent_root = get_root(parent, LANDLOCK_KEY_INODE);
>>> + parent_root = get_root(parent, key_type);
>>> if (IS_ERR(parent_root))
>>> return PTR_ERR(parent_root);
>>>
>>> - /* Locks @child first because we are its only owner. */
>>> - mutex_lock(&child->lock);
>>> - mutex_lock_nested(&parent->lock, SINGLE_DEPTH_NESTING);
>>> -
>>> - /* Copies the @parent tree. */
>>> + /* Copies the @parent inode or network tree. */
>>> rbtree_postorder_for_each_entry_safe(walker_rule, next_rule,
>>> parent_root, node) {
>>> const struct landlock_id id = {
>>> .key = walker_rule->key,
>>> - .type = LANDLOCK_KEY_INODE,
>>> + .type = key_type,
>>> };
>>> +
>>> err = insert_rule(child, id, &walker_rule->layers,
>>> walker_rule->num_layers);
>>> if (err)
>>> - goto out_unlock;
>>> + return err;
>>> }
>>> + return err;
>>> +}
>>> +
>>> +static int inherit_ruleset(struct landlock_ruleset *const parent,
>>> + struct landlock_ruleset *const child)
>>> +{
>>> + int err = 0;
>>> +
>>> + might_sleep();
>>> + if (!parent)
>>> + return 0;
>>> +
>>> + /* Locks @child first because we are its only owner. */
>>> + mutex_lock(&child->lock);
>>> + mutex_lock_nested(&parent->lock, SINGLE_DEPTH_NESTING);
>>> +
>>> + /* Copies the @parent inode tree. */
>>> + err = inherit_tree(parent, child, LANDLOCK_KEY_INODE);
>>> + if (err)
>>> + goto out_unlock;
>>>
>>> if (WARN_ON_ONCE(child->num_layers <= parent->num_layers)) {
>>> err = -EINVAL;
>>> goto out_unlock;
>>> }
>>> - /* Copies the parent layer stack and leaves a space for the new layer. */
>>> + /*
>>> + * Copies the parent layer stack and leaves a space
>>> + * for the new layer.
>>> + */
>>
>> Did that get formatted because of clang-format? The original line exceed
>> the 80 columns limit, but it is not caught by different version of
>> clang-format I tested. Anyway, we should remove this hunk for now
>> because it has no link with the current patch.
>
> Yep. I format every patch with clnag-format.
> I will remove this hunk and let it be as it was.
It's weird because clang-format doesn't touch this hunk for me. Which
version do you use? Do you have any specific configuration?
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