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author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2010-06-17 09:55:58 +0200 |
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committer | James Morris <jmorris@namei.org> | 2010-08-02 07:34:42 +0200 |
commit | 7c2ea22e3c5463627ca98924cd65cb9e480dc29c (patch) | |
tree | 3a105a08cf75c77689bdfe890c64f9ae433748b9 /security/tomoyo/group.c | |
parent | TOMOYO: Aggregate reader functions. (diff) | |
download | linux-7c2ea22e3c5463627ca98924cd65cb9e480dc29c.tar.xz linux-7c2ea22e3c5463627ca98924cd65cb9e480dc29c.zip |
TOMOYO: Merge path_group and number_group.
Use common code for "path_group" and "number_group".
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/tomoyo/group.c')
-rw-r--r-- | security/tomoyo/group.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/security/tomoyo/group.c b/security/tomoyo/group.c new file mode 100644 index 000000000000..3f0a2abf65cc --- /dev/null +++ b/security/tomoyo/group.c @@ -0,0 +1,130 @@ +/* + * security/tomoyo/group.c + * + * Copyright (C) 2005-2010 NTT DATA CORPORATION + */ + +#include <linux/slab.h> +#include "common.h" + +static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a, + const struct tomoyo_acl_head *b) +{ + return container_of(a, struct tomoyo_path_group, head)->member_name == + container_of(b, struct tomoyo_path_group, head)->member_name; +} + +static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a, + const struct tomoyo_acl_head *b) +{ + return !memcmp(&container_of(a, struct tomoyo_number_group, head) + ->number, + &container_of(b, struct tomoyo_number_group, head) + ->number, + sizeof(container_of(a, struct tomoyo_number_group, head) + ->number)); +} + +/** + * tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group" list. + * + * @data: String to parse. + * @is_delete: True if it is a delete request. + * @type: Type of this group. + * + * Returns 0 on success, negative value otherwise. + */ +int tomoyo_write_group(char *data, const bool is_delete, const u8 type) +{ + struct tomoyo_group *group; + struct list_head *member; + char *w[2]; + int error = -EINVAL; + if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0]) + return -EINVAL; + group = tomoyo_get_group(w[0], type); + if (!group) + return -ENOMEM; + member = &group->member_list; + if (type == TOMOYO_PATH_GROUP) { + struct tomoyo_path_group e = { }; + e.member_name = tomoyo_get_name(w[1]); + if (!e.member_name) { + error = -ENOMEM; + goto out; + } + error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, + member, tomoyo_same_path_group); + tomoyo_put_name(e.member_name); + } else if (type == TOMOYO_NUMBER_GROUP) { + struct tomoyo_number_group e = { }; + if (w[1][0] == '@' + || !tomoyo_parse_number_union(w[1], &e.number) + || e.number.values[0] > e.number.values[1]) + goto out; + error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, + member, tomoyo_same_number_group); + /* + * tomoyo_put_number_union() is not needed because + * w[1][0] != '@'. + */ + } + out: + tomoyo_put_group(group); + return error; +} + +/** + * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group. + * + * @pathname: The name of pathname. + * @group: Pointer to "struct tomoyo_path_group". + * + * Returns true if @pathname matches pathnames in @group, false otherwise. + * + * Caller holds tomoyo_read_lock(). + */ +bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname, + const struct tomoyo_group *group) +{ + struct tomoyo_path_group *member; + bool matched = false; + list_for_each_entry_rcu(member, &group->member_list, head.list) { + if (member->head.is_deleted) + continue; + if (!tomoyo_path_matches_pattern(pathname, member->member_name)) + continue; + matched = true; + break; + } + return matched; +} + +/** + * tomoyo_number_matches_group - Check whether the given number matches members of the given number group. + * + * @min: Min number. + * @max: Max number. + * @group: Pointer to "struct tomoyo_number_group". + * + * Returns true if @min and @max partially overlaps @group, false otherwise. + * + * Caller holds tomoyo_read_lock(). + */ +bool tomoyo_number_matches_group(const unsigned long min, + const unsigned long max, + const struct tomoyo_group *group) +{ + struct tomoyo_number_group *member; + bool matched = false; + list_for_each_entry_rcu(member, &group->member_list, head.list) { + if (member->head.is_deleted) + continue; + if (min > member->number.values[1] || + max < member->number.values[0]) + continue; + matched = true; + break; + } + return matched; +} |