release/src-rt-6.x.4708/linux/linux-2.6.36/security/tomoyo/group.c

   1 /*
   2  * security/tomoyo/group.c
   3  *
   4  * Copyright (C) 2005-2010  NTT DATA CORPORATION
   5  */
   6
   7 #include <linux/slab.h>
   8 #include "common.h"
   9
  10 static bool tomoyo_same_path_group(const struct tomoyo_acl_head *a,
  11                                 const struct tomoyo_acl_head *b)
  12 {
  13         return container_of(a, struct tomoyo_path_group, head)->member_name ==
  14                 container_of(b, struct tomoyo_path_group, head)->member_name;
  15 }
  16
  17 static bool tomoyo_same_number_group(const struct tomoyo_acl_head *a,
  18                                   const struct tomoyo_acl_head *b)
  19 {
  20         return !memcmp(&container_of(a, struct tomoyo_number_group, head)
  21                        ->number,
  22                        &container_of(b, struct tomoyo_number_group, head)
  23                        ->number,
  24                        sizeof(container_of(a, struct tomoyo_number_group, head)
  25                               ->number));
  26 }
  27
  28 /**
  29  * tomoyo_write_group - Write "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
  30  *
  31  * @data:      String to parse.
  32  * @is_delete: True if it is a delete request.
  33  * @type:      Type of this group.
  34  *
  35  * Returns 0 on success, negative value otherwise.
  36  */
  37 int tomoyo_write_group(char *data, const bool is_delete, const u8 type)
  38 {
  39         struct tomoyo_group *group;
  40         struct list_head *member;
  41         char *w[2];
  42         int error = -EINVAL;
  43         if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
  44                 return -EINVAL;
  45         group = tomoyo_get_group(w[0], type);
  46         if (!group)
  47                 return -ENOMEM;
  48         member = &group->member_list;
  49         if (type == TOMOYO_PATH_GROUP) {
  50                 struct tomoyo_path_group e = { };
  51                 e.member_name = tomoyo_get_name(w[1]);
  52                 if (!e.member_name) {
  53                         error = -ENOMEM;
  54                         goto out;
  55                 }
  56                 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
  57                                              member, tomoyo_same_path_group);
  58                 tomoyo_put_name(e.member_name);
  59         } else if (type == TOMOYO_NUMBER_GROUP) {
  60                 struct tomoyo_number_group e = { };
  61                 if (w[1][0] == '@'
  62                     || !tomoyo_parse_number_union(w[1], &e.number)
  63                     || e.number.values[0] > e.number.values[1])
  64                         goto out;
  65                 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
  66                                              member, tomoyo_same_number_group);
  67                 /*
  68                  * tomoyo_put_number_union() is not needed because
  69                  * w[1][0] != '@'.
  70                  */
  71         }
  72  out:
  73         tomoyo_put_group(group);
  74         return error;
  75 }
  76
  77 /**
  78  * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
  79  *
  80  * @pathname:        The name of pathname.
  81  * @group:           Pointer to "struct tomoyo_path_group".
  82  *
  83  * Returns matched member's pathname if @pathname matches pathnames in @group,
  84  * NULL otherwise.
  85  *
  86  * Caller holds tomoyo_read_lock().
  87  */
  88 const struct tomoyo_path_info *
  89 tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
  90                           const struct tomoyo_group *group)
  91 {
  92         struct tomoyo_path_group *member;
  93         list_for_each_entry_rcu(member, &group->member_list, head.list) {
  94                 if (member->head.is_deleted)
  95                         continue;
  96                 if (!tomoyo_path_matches_pattern(pathname, member->member_name))
  97                         continue;
  98                 return member->member_name;
  99         }
 100         return NULL;
 101 }
 102
 103 /**
 104  * tomoyo_number_matches_group - Check whether the given number matches members of the given number group.
 105  *
 106  * @min:   Min number.
 107  * @max:   Max number.
 108  * @group: Pointer to "struct tomoyo_number_group".
 109  *
 110  * Returns true if @min and @max partially overlaps @group, false otherwise.
 111  *
 112  * Caller holds tomoyo_read_lock().
 113  */
 114 bool tomoyo_number_matches_group(const unsigned long min,
 115                                  const unsigned long max,
 116                                  const struct tomoyo_group *group)
 117 {
 118         struct tomoyo_number_group *member;
 119         bool matched = false;
 120         list_for_each_entry_rcu(member, &group->member_list, head.list) {
 121                 if (member->head.is_deleted)
 122                         continue;
 123                 if (min > member->number.values[1] ||
 124                     max < member->number.values[0])
 125                         continue;
 126                 matched = true;
 127                 break;
 128         }
 129         return matched;
 130 }