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TOMOYO Linux Cross Reference
Linux/security/tomoyo/memory.c

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  1 /*
  2  * security/tomoyo/memory.c
  3  *
  4  * Copyright (C) 2005-2011  NTT DATA CORPORATION
  5  */
  6 
  7 #include <linux/hash.h>
  8 #include <linux/slab.h>
  9 #include "common.h"
 10 
 11 /**
 12  * tomoyo_warn_oom - Print out of memory warning message.
 13  *
 14  * @function: Function's name.
 15  */
 16 void tomoyo_warn_oom(const char *function)
 17 {
 18         /* Reduce error messages. */
 19         static pid_t tomoyo_last_pid;
 20         const pid_t pid = current->pid;
 21         if (tomoyo_last_pid != pid) {
 22                 printk(KERN_WARNING "ERROR: Out of memory at %s.\n",
 23                        function);
 24                 tomoyo_last_pid = pid;
 25         }
 26         if (!tomoyo_policy_loaded)
 27                 panic("MAC Initialization failed.\n");
 28 }
 29 
 30 /* Memoy currently used by policy/audit log/query. */
 31 unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT];
 32 /* Memory quota for "policy"/"audit log"/"query". */
 33 unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT];
 34 
 35 /**
 36  * tomoyo_memory_ok - Check memory quota.
 37  *
 38  * @ptr: Pointer to allocated memory.
 39  *
 40  * Returns true on success, false otherwise.
 41  *
 42  * Returns true if @ptr is not NULL and quota not exceeded, false otherwise.
 43  *
 44  * Caller holds tomoyo_policy_lock mutex.
 45  */
 46 bool tomoyo_memory_ok(void *ptr)
 47 {
 48         if (ptr) {
 49                 const size_t s = ksize(ptr);
 50                 tomoyo_memory_used[TOMOYO_MEMORY_POLICY] += s;
 51                 if (!tomoyo_memory_quota[TOMOYO_MEMORY_POLICY] ||
 52                     tomoyo_memory_used[TOMOYO_MEMORY_POLICY] <=
 53                     tomoyo_memory_quota[TOMOYO_MEMORY_POLICY])
 54                         return true;
 55                 tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= s;
 56         }
 57         tomoyo_warn_oom(__func__);
 58         return false;
 59 }
 60 
 61 /**
 62  * tomoyo_commit_ok - Check memory quota.
 63  *
 64  * @data:   Data to copy from.
 65  * @size:   Size in byte.
 66  *
 67  * Returns pointer to allocated memory on success, NULL otherwise.
 68  * @data is zero-cleared on success.
 69  *
 70  * Caller holds tomoyo_policy_lock mutex.
 71  */
 72 void *tomoyo_commit_ok(void *data, const unsigned int size)
 73 {
 74         void *ptr = kzalloc(size, GFP_NOFS);
 75         if (tomoyo_memory_ok(ptr)) {
 76                 memmove(ptr, data, size);
 77                 memset(data, 0, size);
 78                 return ptr;
 79         }
 80         kfree(ptr);
 81         return NULL;
 82 }
 83 
 84 /**
 85  * tomoyo_get_group - Allocate memory for "struct tomoyo_path_group"/"struct tomoyo_number_group".
 86  *
 87  * @param: Pointer to "struct tomoyo_acl_param".
 88  * @idx:   Index number.
 89  *
 90  * Returns pointer to "struct tomoyo_group" on success, NULL otherwise.
 91  */
 92 struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param,
 93                                       const u8 idx)
 94 {
 95         struct tomoyo_group e = { };
 96         struct tomoyo_group *group = NULL;
 97         struct list_head *list;
 98         const char *group_name = tomoyo_read_token(param);
 99         bool found = false;
100         if (!tomoyo_correct_word(group_name) || idx >= TOMOYO_MAX_GROUP)
101                 return NULL;
102         e.group_name = tomoyo_get_name(group_name);
103         if (!e.group_name)
104                 return NULL;
105         if (mutex_lock_interruptible(&tomoyo_policy_lock))
106                 goto out;
107         list = &param->ns->group_list[idx];
108         list_for_each_entry(group, list, head.list) {
109                 if (e.group_name != group->group_name ||
110                     atomic_read(&group->head.users) == TOMOYO_GC_IN_PROGRESS)
111                         continue;
112                 atomic_inc(&group->head.users);
113                 found = true;
114                 break;
115         }
116         if (!found) {
117                 struct tomoyo_group *entry = tomoyo_commit_ok(&e, sizeof(e));
118                 if (entry) {
119                         INIT_LIST_HEAD(&entry->member_list);
120                         atomic_set(&entry->head.users, 1);
121                         list_add_tail_rcu(&entry->head.list, list);
122                         group = entry;
123                         found = true;
124                 }
125         }
126         mutex_unlock(&tomoyo_policy_lock);
127 out:
128         tomoyo_put_name(e.group_name);
129         return found ? group : NULL;
130 }
131 
132 /*
133  * tomoyo_name_list is used for holding string data used by TOMOYO.
134  * Since same string data is likely used for multiple times (e.g.
135  * "/lib/libc-2.5.so"), TOMOYO shares string data in the form of
136  * "const struct tomoyo_path_info *".
137  */
138 struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];
139 
140 /**
141  * tomoyo_get_name - Allocate permanent memory for string data.
142  *
143  * @name: The string to store into the permernent memory.
144  *
145  * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
146  */
147 const struct tomoyo_path_info *tomoyo_get_name(const char *name)
148 {
149         struct tomoyo_name *ptr;
150         unsigned int hash;
151         int len;
152         struct list_head *head;
153 
154         if (!name)
155                 return NULL;
156         len = strlen(name) + 1;
157         hash = full_name_hash(NULL, (const unsigned char *) name, len - 1);
158         head = &tomoyo_name_list[hash_long(hash, TOMOYO_HASH_BITS)];
159         if (mutex_lock_interruptible(&tomoyo_policy_lock))
160                 return NULL;
161         list_for_each_entry(ptr, head, head.list) {
162                 if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name) ||
163                     atomic_read(&ptr->head.users) == TOMOYO_GC_IN_PROGRESS)
164                         continue;
165                 atomic_inc(&ptr->head.users);
166                 goto out;
167         }
168         ptr = kzalloc(sizeof(*ptr) + len, GFP_NOFS);
169         if (tomoyo_memory_ok(ptr)) {
170                 ptr->entry.name = ((char *) ptr) + sizeof(*ptr);
171                 memmove((char *) ptr->entry.name, name, len);
172                 atomic_set(&ptr->head.users, 1);
173                 tomoyo_fill_path_info(&ptr->entry);
174                 list_add_tail(&ptr->head.list, head);
175         } else {
176                 kfree(ptr);
177                 ptr = NULL;
178         }
179 out:
180         mutex_unlock(&tomoyo_policy_lock);
181         return ptr ? &ptr->entry : NULL;
182 }
183 
184 /* Initial namespace.*/
185 struct tomoyo_policy_namespace tomoyo_kernel_namespace;
186 
187 /**
188  * tomoyo_mm_init - Initialize mm related code.
189  */
190 void __init tomoyo_mm_init(void)
191 {
192         int idx;
193         for (idx = 0; idx < TOMOYO_MAX_HASH; idx++)
194                 INIT_LIST_HEAD(&tomoyo_name_list[idx]);
195         tomoyo_kernel_namespace.name = "<kernel>";
196         tomoyo_init_policy_namespace(&tomoyo_kernel_namespace);
197         tomoyo_kernel_domain.ns = &tomoyo_kernel_namespace;
198         INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list);
199         tomoyo_kernel_domain.domainname = tomoyo_get_name("<kernel>");
200         list_add_tail_rcu(&tomoyo_kernel_domain.list, &tomoyo_domain_list);
201 }
202 

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