31845e8c6d
Now lists are accessible via array index. Aggregate reader functions using index. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
/*
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* security/tomoyo/number_group.c
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*
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* Copyright (C) 2005-2009 NTT DATA CORPORATION
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*/
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#include <linux/slab.h>
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#include "common.h"
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/**
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* tomoyo_get_group - Allocate memory for "struct tomoyo_number_group".
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*
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* @group_name: The name of number group.
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*
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* Returns pointer to "struct tomoyo_number_group" on success,
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* NULL otherwise.
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*/
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struct tomoyo_group *tomoyo_get_number_group(const char *group_name)
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{
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struct tomoyo_group *entry = NULL;
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struct tomoyo_group *group = NULL;
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const struct tomoyo_path_info *saved_group_name;
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int error = -ENOMEM;
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if (!tomoyo_correct_word(group_name))
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return NULL;
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saved_group_name = tomoyo_get_name(group_name);
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if (!saved_group_name)
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return NULL;
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entry = kzalloc(sizeof(*entry), GFP_NOFS);
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if (mutex_lock_interruptible(&tomoyo_policy_lock))
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goto out;
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list_for_each_entry_rcu(group, &tomoyo_group_list[TOMOYO_NUMBER_GROUP],
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list) {
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if (saved_group_name != group->group_name)
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continue;
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atomic_inc(&group->users);
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error = 0;
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break;
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}
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if (error && tomoyo_memory_ok(entry)) {
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INIT_LIST_HEAD(&entry->member_list);
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entry->group_name = saved_group_name;
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saved_group_name = NULL;
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atomic_set(&entry->users, 1);
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list_add_tail_rcu(&entry->list,
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&tomoyo_group_list[TOMOYO_NUMBER_GROUP]);
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group = entry;
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entry = NULL;
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error = 0;
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}
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mutex_unlock(&tomoyo_policy_lock);
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out:
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tomoyo_put_name(saved_group_name);
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kfree(entry);
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return !error ? group : NULL;
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}
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static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
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const struct tomoyo_acl_head *b)
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{
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return !memcmp(&container_of(a, struct tomoyo_number_group,
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head)->number,
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&container_of(b, struct tomoyo_number_group,
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head)->number,
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sizeof(container_of(a,
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struct tomoyo_number_group,
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head)->number));
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}
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/**
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* tomoyo_write_number_group_policy - Write "struct tomoyo_number_group" list.
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*
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* @data: String to parse.
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* @is_delete: True if it is a delete request.
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*
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* Returns 0 on success, nagative value otherwise.
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*/
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int tomoyo_write_number_group_policy(char *data, const bool is_delete)
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{
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struct tomoyo_group *group;
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struct tomoyo_number_group e = { };
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int error;
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char *w[2];
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if (!tomoyo_tokenize(data, w, sizeof(w)))
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return -EINVAL;
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if (w[1][0] == '@' || !tomoyo_parse_number_union(w[1], &e.number) ||
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e.number.values[0] > e.number.values[1])
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return -EINVAL;
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group = tomoyo_get_number_group(w[0]);
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if (!group)
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return -ENOMEM;
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error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
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&group->member_list,
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tomoyo_same_number_group);
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tomoyo_put_group(group);
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return error;
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}
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/**
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* tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
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*
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* @min: Min number.
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* @max: Max number.
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* @group: Pointer to "struct tomoyo_number_group".
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*
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* Returns true if @min and @max partially overlaps @group, false otherwise.
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*
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* Caller holds tomoyo_read_lock().
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*/
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bool tomoyo_number_matches_group(const unsigned long min,
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const unsigned long max,
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const struct tomoyo_group *group)
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{
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struct tomoyo_number_group *member;
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bool matched = false;
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list_for_each_entry_rcu(member, &group->member_list, head.list) {
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if (member->head.is_deleted)
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continue;
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if (min > member->number.values[1] ||
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max < member->number.values[0])
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continue;
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matched = true;
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break;
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}
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return matched;
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}
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