TOMOYO: Return error if fails to delete a domain
[linux-3.10.git] / security / tomoyo / common.c
1 /*
2  * security/tomoyo/common.c
3  *
4  * Copyright (C) 2005-2011  NTT DATA CORPORATION
5  */
6
7 #include <linux/uaccess.h>
8 #include <linux/slab.h>
9 #include <linux/security.h>
10 #include "common.h"
11
12 /* String table for operation mode. */
13 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
14         [TOMOYO_CONFIG_DISABLED]   = "disabled",
15         [TOMOYO_CONFIG_LEARNING]   = "learning",
16         [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
17         [TOMOYO_CONFIG_ENFORCING]  = "enforcing"
18 };
19
20 /* String table for /sys/kernel/security/tomoyo/profile */
21 const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
22                                        + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
23         /* CONFIG::file group */
24         [TOMOYO_MAC_FILE_EXECUTE]    = "execute",
25         [TOMOYO_MAC_FILE_OPEN]       = "open",
26         [TOMOYO_MAC_FILE_CREATE]     = "create",
27         [TOMOYO_MAC_FILE_UNLINK]     = "unlink",
28         [TOMOYO_MAC_FILE_GETATTR]    = "getattr",
29         [TOMOYO_MAC_FILE_MKDIR]      = "mkdir",
30         [TOMOYO_MAC_FILE_RMDIR]      = "rmdir",
31         [TOMOYO_MAC_FILE_MKFIFO]     = "mkfifo",
32         [TOMOYO_MAC_FILE_MKSOCK]     = "mksock",
33         [TOMOYO_MAC_FILE_TRUNCATE]   = "truncate",
34         [TOMOYO_MAC_FILE_SYMLINK]    = "symlink",
35         [TOMOYO_MAC_FILE_MKBLOCK]    = "mkblock",
36         [TOMOYO_MAC_FILE_MKCHAR]     = "mkchar",
37         [TOMOYO_MAC_FILE_LINK]       = "link",
38         [TOMOYO_MAC_FILE_RENAME]     = "rename",
39         [TOMOYO_MAC_FILE_CHMOD]      = "chmod",
40         [TOMOYO_MAC_FILE_CHOWN]      = "chown",
41         [TOMOYO_MAC_FILE_CHGRP]      = "chgrp",
42         [TOMOYO_MAC_FILE_IOCTL]      = "ioctl",
43         [TOMOYO_MAC_FILE_CHROOT]     = "chroot",
44         [TOMOYO_MAC_FILE_MOUNT]      = "mount",
45         [TOMOYO_MAC_FILE_UMOUNT]     = "unmount",
46         [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
47         /* CONFIG::network group */
48         [TOMOYO_MAC_NETWORK_INET_STREAM_BIND]       = "inet_stream_bind",
49         [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN]     = "inet_stream_listen",
50         [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT]    = "inet_stream_connect",
51         [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND]        = "inet_dgram_bind",
52         [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND]        = "inet_dgram_send",
53         [TOMOYO_MAC_NETWORK_INET_RAW_BIND]          = "inet_raw_bind",
54         [TOMOYO_MAC_NETWORK_INET_RAW_SEND]          = "inet_raw_send",
55         [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND]       = "unix_stream_bind",
56         [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN]     = "unix_stream_listen",
57         [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT]    = "unix_stream_connect",
58         [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND]        = "unix_dgram_bind",
59         [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND]        = "unix_dgram_send",
60         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND]    = "unix_seqpacket_bind",
61         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN]  = "unix_seqpacket_listen",
62         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
63         /* CONFIG::misc group */
64         [TOMOYO_MAC_ENVIRON] = "env",
65         /* CONFIG group */
66         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
67         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
68         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
69 };
70
71 /* String table for conditions. */
72 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
73         [TOMOYO_TASK_UID]             = "task.uid",
74         [TOMOYO_TASK_EUID]            = "task.euid",
75         [TOMOYO_TASK_SUID]            = "task.suid",
76         [TOMOYO_TASK_FSUID]           = "task.fsuid",
77         [TOMOYO_TASK_GID]             = "task.gid",
78         [TOMOYO_TASK_EGID]            = "task.egid",
79         [TOMOYO_TASK_SGID]            = "task.sgid",
80         [TOMOYO_TASK_FSGID]           = "task.fsgid",
81         [TOMOYO_TASK_PID]             = "task.pid",
82         [TOMOYO_TASK_PPID]            = "task.ppid",
83         [TOMOYO_EXEC_ARGC]            = "exec.argc",
84         [TOMOYO_EXEC_ENVC]            = "exec.envc",
85         [TOMOYO_TYPE_IS_SOCKET]       = "socket",
86         [TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
87         [TOMOYO_TYPE_IS_FILE]         = "file",
88         [TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
89         [TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
90         [TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
91         [TOMOYO_TYPE_IS_FIFO]         = "fifo",
92         [TOMOYO_MODE_SETUID]          = "setuid",
93         [TOMOYO_MODE_SETGID]          = "setgid",
94         [TOMOYO_MODE_STICKY]          = "sticky",
95         [TOMOYO_MODE_OWNER_READ]      = "owner_read",
96         [TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
97         [TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
98         [TOMOYO_MODE_GROUP_READ]      = "group_read",
99         [TOMOYO_MODE_GROUP_WRITE]     = "group_write",
100         [TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
101         [TOMOYO_MODE_OTHERS_READ]     = "others_read",
102         [TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
103         [TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
104         [TOMOYO_EXEC_REALPATH]        = "exec.realpath",
105         [TOMOYO_SYMLINK_TARGET]       = "symlink.target",
106         [TOMOYO_PATH1_UID]            = "path1.uid",
107         [TOMOYO_PATH1_GID]            = "path1.gid",
108         [TOMOYO_PATH1_INO]            = "path1.ino",
109         [TOMOYO_PATH1_MAJOR]          = "path1.major",
110         [TOMOYO_PATH1_MINOR]          = "path1.minor",
111         [TOMOYO_PATH1_PERM]           = "path1.perm",
112         [TOMOYO_PATH1_TYPE]           = "path1.type",
113         [TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
114         [TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
115         [TOMOYO_PATH2_UID]            = "path2.uid",
116         [TOMOYO_PATH2_GID]            = "path2.gid",
117         [TOMOYO_PATH2_INO]            = "path2.ino",
118         [TOMOYO_PATH2_MAJOR]          = "path2.major",
119         [TOMOYO_PATH2_MINOR]          = "path2.minor",
120         [TOMOYO_PATH2_PERM]           = "path2.perm",
121         [TOMOYO_PATH2_TYPE]           = "path2.type",
122         [TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
123         [TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
124         [TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
125         [TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
126         [TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
127         [TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
128         [TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
129         [TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
130         [TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
131         [TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
132 };
133
134 /* String table for PREFERENCE keyword. */
135 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
136         [TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
137         [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
138 };
139
140 /* String table for path operation. */
141 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
142         [TOMOYO_TYPE_EXECUTE]    = "execute",
143         [TOMOYO_TYPE_READ]       = "read",
144         [TOMOYO_TYPE_WRITE]      = "write",
145         [TOMOYO_TYPE_APPEND]     = "append",
146         [TOMOYO_TYPE_UNLINK]     = "unlink",
147         [TOMOYO_TYPE_GETATTR]    = "getattr",
148         [TOMOYO_TYPE_RMDIR]      = "rmdir",
149         [TOMOYO_TYPE_TRUNCATE]   = "truncate",
150         [TOMOYO_TYPE_SYMLINK]    = "symlink",
151         [TOMOYO_TYPE_CHROOT]     = "chroot",
152         [TOMOYO_TYPE_UMOUNT]     = "unmount",
153 };
154
155 /* String table for socket's operation. */
156 const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
157         [TOMOYO_NETWORK_BIND]    = "bind",
158         [TOMOYO_NETWORK_LISTEN]  = "listen",
159         [TOMOYO_NETWORK_CONNECT] = "connect",
160         [TOMOYO_NETWORK_SEND]    = "send",
161 };
162
163 /* String table for categories. */
164 static const char * const tomoyo_category_keywords
165 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
166         [TOMOYO_MAC_CATEGORY_FILE]    = "file",
167         [TOMOYO_MAC_CATEGORY_NETWORK] = "network",
168         [TOMOYO_MAC_CATEGORY_MISC]    = "misc",
169 };
170
171 /* Permit policy management by non-root user? */
172 static bool tomoyo_manage_by_non_root;
173
174 /* Utility functions. */
175
176 /**
177  * tomoyo_yesno - Return "yes" or "no".
178  *
179  * @value: Bool value.
180  */
181 const char *tomoyo_yesno(const unsigned int value)
182 {
183         return value ? "yes" : "no";
184 }
185
186 /**
187  * tomoyo_addprintf - strncat()-like-snprintf().
188  *
189  * @buffer: Buffer to write to. Must be '\0'-terminated.
190  * @len:    Size of @buffer.
191  * @fmt:    The printf()'s format string, followed by parameters.
192  *
193  * Returns nothing.
194  */
195 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
196 {
197         va_list args;
198         const int pos = strlen(buffer);
199         va_start(args, fmt);
200         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
201         va_end(args);
202 }
203
204 /**
205  * tomoyo_flush - Flush queued string to userspace's buffer.
206  *
207  * @head:   Pointer to "struct tomoyo_io_buffer".
208  *
209  * Returns true if all data was flushed, false otherwise.
210  */
211 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
212 {
213         while (head->r.w_pos) {
214                 const char *w = head->r.w[0];
215                 size_t len = strlen(w);
216                 if (len) {
217                         if (len > head->read_user_buf_avail)
218                                 len = head->read_user_buf_avail;
219                         if (!len)
220                                 return false;
221                         if (copy_to_user(head->read_user_buf, w, len))
222                                 return false;
223                         head->read_user_buf_avail -= len;
224                         head->read_user_buf += len;
225                         w += len;
226                 }
227                 head->r.w[0] = w;
228                 if (*w)
229                         return false;
230                 /* Add '\0' for audit logs and query. */
231                 if (head->poll) {
232                         if (!head->read_user_buf_avail ||
233                             copy_to_user(head->read_user_buf, "", 1))
234                                 return false;
235                         head->read_user_buf_avail--;
236                         head->read_user_buf++;
237                 }
238                 head->r.w_pos--;
239                 for (len = 0; len < head->r.w_pos; len++)
240                         head->r.w[len] = head->r.w[len + 1];
241         }
242         head->r.avail = 0;
243         return true;
244 }
245
246 /**
247  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
248  *
249  * @head:   Pointer to "struct tomoyo_io_buffer".
250  * @string: String to print.
251  *
252  * Note that @string has to be kept valid until @head is kfree()d.
253  * This means that char[] allocated on stack memory cannot be passed to
254  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
255  */
256 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
257 {
258         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
259                 head->r.w[head->r.w_pos++] = string;
260                 tomoyo_flush(head);
261         } else
262                 WARN_ON(1);
263 }
264
265 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
266                              ...) __printf(2, 3);
267
268 /**
269  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
270  *
271  * @head: Pointer to "struct tomoyo_io_buffer".
272  * @fmt:  The printf()'s format string, followed by parameters.
273  */
274 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
275                              ...)
276 {
277         va_list args;
278         size_t len;
279         size_t pos = head->r.avail;
280         int size = head->readbuf_size - pos;
281         if (size <= 0)
282                 return;
283         va_start(args, fmt);
284         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
285         va_end(args);
286         if (pos + len >= head->readbuf_size) {
287                 WARN_ON(1);
288                 return;
289         }
290         head->r.avail += len;
291         tomoyo_set_string(head, head->read_buf + pos);
292 }
293
294 /**
295  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
296  *
297  * @head: Pointer to "struct tomoyo_io_buffer".
298  *
299  * Returns nothing.
300  */
301 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
302 {
303         tomoyo_set_string(head, " ");
304 }
305
306 /**
307  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
308  *
309  * @head: Pointer to "struct tomoyo_io_buffer".
310  *
311  * Returns nothing.
312  */
313 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
314 {
315         tomoyo_set_string(head, "\n");
316         return !head->r.w_pos;
317 }
318
319 /**
320  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
321  *
322  * @head: Pointer to "struct tomoyo_io_buffer".
323  *
324  * Returns nothing.
325  */
326 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
327 {
328         tomoyo_set_string(head, "/");
329 }
330
331 /* List of namespaces. */
332 LIST_HEAD(tomoyo_namespace_list);
333 /* True if namespace other than tomoyo_kernel_namespace is defined. */
334 static bool tomoyo_namespace_enabled;
335
336 /**
337  * tomoyo_init_policy_namespace - Initialize namespace.
338  *
339  * @ns: Pointer to "struct tomoyo_policy_namespace".
340  *
341  * Returns nothing.
342  */
343 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
344 {
345         unsigned int idx;
346         for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
347                 INIT_LIST_HEAD(&ns->acl_group[idx]);
348         for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
349                 INIT_LIST_HEAD(&ns->group_list[idx]);
350         for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
351                 INIT_LIST_HEAD(&ns->policy_list[idx]);
352         ns->profile_version = 20110903;
353         tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
354         list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
355 }
356
357 /**
358  * tomoyo_print_namespace - Print namespace header.
359  *
360  * @head: Pointer to "struct tomoyo_io_buffer".
361  *
362  * Returns nothing.
363  */
364 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
365 {
366         if (!tomoyo_namespace_enabled)
367                 return;
368         tomoyo_set_string(head,
369                           container_of(head->r.ns,
370                                        struct tomoyo_policy_namespace,
371                                        namespace_list)->name);
372         tomoyo_set_space(head);
373 }
374
375 /**
376  * tomoyo_print_name_union - Print a tomoyo_name_union.
377  *
378  * @head: Pointer to "struct tomoyo_io_buffer".
379  * @ptr:  Pointer to "struct tomoyo_name_union".
380  */
381 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
382                                     const struct tomoyo_name_union *ptr)
383 {
384         tomoyo_set_space(head);
385         if (ptr->group) {
386                 tomoyo_set_string(head, "@");
387                 tomoyo_set_string(head, ptr->group->group_name->name);
388         } else {
389                 tomoyo_set_string(head, ptr->filename->name);
390         }
391 }
392
393 /**
394  * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
395  *
396  * @head: Pointer to "struct tomoyo_io_buffer".
397  * @ptr:  Pointer to "struct tomoyo_name_union".
398  *
399  * Returns nothing.
400  */
401 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
402                                            const struct tomoyo_name_union *ptr)
403 {
404         if (ptr->group) {
405                 tomoyo_set_string(head, "@");
406                 tomoyo_set_string(head, ptr->group->group_name->name);
407         } else {
408                 tomoyo_set_string(head, "\"");
409                 tomoyo_set_string(head, ptr->filename->name);
410                 tomoyo_set_string(head, "\"");
411         }
412 }
413
414 /**
415  * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
416  *
417  * @head: Pointer to "struct tomoyo_io_buffer".
418  * @ptr:  Pointer to "struct tomoyo_number_union".
419  *
420  * Returns nothing.
421  */
422 static void tomoyo_print_number_union_nospace
423 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
424 {
425         if (ptr->group) {
426                 tomoyo_set_string(head, "@");
427                 tomoyo_set_string(head, ptr->group->group_name->name);
428         } else {
429                 int i;
430                 unsigned long min = ptr->values[0];
431                 const unsigned long max = ptr->values[1];
432                 u8 min_type = ptr->value_type[0];
433                 const u8 max_type = ptr->value_type[1];
434                 char buffer[128];
435                 buffer[0] = '\0';
436                 for (i = 0; i < 2; i++) {
437                         switch (min_type) {
438                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
439                                 tomoyo_addprintf(buffer, sizeof(buffer),
440                                                  "0x%lX", min);
441                                 break;
442                         case TOMOYO_VALUE_TYPE_OCTAL:
443                                 tomoyo_addprintf(buffer, sizeof(buffer),
444                                                  "0%lo", min);
445                                 break;
446                         default:
447                                 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
448                                                  min);
449                                 break;
450                         }
451                         if (min == max && min_type == max_type)
452                                 break;
453                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
454                         min_type = max_type;
455                         min = max;
456                 }
457                 tomoyo_io_printf(head, "%s", buffer);
458         }
459 }
460
461 /**
462  * tomoyo_print_number_union - Print a tomoyo_number_union.
463  *
464  * @head: Pointer to "struct tomoyo_io_buffer".
465  * @ptr:  Pointer to "struct tomoyo_number_union".
466  *
467  * Returns nothing.
468  */
469 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
470                                       const struct tomoyo_number_union *ptr)
471 {
472         tomoyo_set_space(head);
473         tomoyo_print_number_union_nospace(head, ptr);
474 }
475
476 /**
477  * tomoyo_assign_profile - Create a new profile.
478  *
479  * @ns:      Pointer to "struct tomoyo_policy_namespace".
480  * @profile: Profile number to create.
481  *
482  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
483  */
484 static struct tomoyo_profile *tomoyo_assign_profile
485 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
486 {
487         struct tomoyo_profile *ptr;
488         struct tomoyo_profile *entry;
489         if (profile >= TOMOYO_MAX_PROFILES)
490                 return NULL;
491         ptr = ns->profile_ptr[profile];
492         if (ptr)
493                 return ptr;
494         entry = kzalloc(sizeof(*entry), GFP_NOFS);
495         if (mutex_lock_interruptible(&tomoyo_policy_lock))
496                 goto out;
497         ptr = ns->profile_ptr[profile];
498         if (!ptr && tomoyo_memory_ok(entry)) {
499                 ptr = entry;
500                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
501                         TOMOYO_CONFIG_WANT_GRANT_LOG |
502                         TOMOYO_CONFIG_WANT_REJECT_LOG;
503                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
504                        sizeof(ptr->config));
505                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
506                         CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
507                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
508                         CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
509                 mb(); /* Avoid out-of-order execution. */
510                 ns->profile_ptr[profile] = ptr;
511                 entry = NULL;
512         }
513         mutex_unlock(&tomoyo_policy_lock);
514  out:
515         kfree(entry);
516         return ptr;
517 }
518
519 /**
520  * tomoyo_profile - Find a profile.
521  *
522  * @ns:      Pointer to "struct tomoyo_policy_namespace".
523  * @profile: Profile number to find.
524  *
525  * Returns pointer to "struct tomoyo_profile".
526  */
527 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
528                                       const u8 profile)
529 {
530         static struct tomoyo_profile tomoyo_null_profile;
531         struct tomoyo_profile *ptr = ns->profile_ptr[profile];
532         if (!ptr)
533                 ptr = &tomoyo_null_profile;
534         return ptr;
535 }
536
537 /**
538  * tomoyo_find_yesno - Find values for specified keyword.
539  *
540  * @string: String to check.
541  * @find:   Name of keyword.
542  *
543  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
544  */
545 static s8 tomoyo_find_yesno(const char *string, const char *find)
546 {
547         const char *cp = strstr(string, find);
548         if (cp) {
549                 cp += strlen(find);
550                 if (!strncmp(cp, "=yes", 4))
551                         return 1;
552                 else if (!strncmp(cp, "=no", 3))
553                         return 0;
554         }
555         return -1;
556 }
557
558 /**
559  * tomoyo_set_uint - Set value for specified preference.
560  *
561  * @i:      Pointer to "unsigned int".
562  * @string: String to check.
563  * @find:   Name of keyword.
564  *
565  * Returns nothing.
566  */
567 static void tomoyo_set_uint(unsigned int *i, const char *string,
568                             const char *find)
569 {
570         const char *cp = strstr(string, find);
571         if (cp)
572                 sscanf(cp + strlen(find), "=%u", i);
573 }
574
575 /**
576  * tomoyo_set_mode - Set mode for specified profile.
577  *
578  * @name:    Name of functionality.
579  * @value:   Mode for @name.
580  * @profile: Pointer to "struct tomoyo_profile".
581  *
582  * Returns 0 on success, negative value otherwise.
583  */
584 static int tomoyo_set_mode(char *name, const char *value,
585                            struct tomoyo_profile *profile)
586 {
587         u8 i;
588         u8 config;
589         if (!strcmp(name, "CONFIG")) {
590                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
591                 config = profile->default_config;
592         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
593                 config = 0;
594                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
595                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
596                         int len = 0;
597                         if (i < TOMOYO_MAX_MAC_INDEX) {
598                                 const u8 c = tomoyo_index2category[i];
599                                 const char *category =
600                                         tomoyo_category_keywords[c];
601                                 len = strlen(category);
602                                 if (strncmp(name, category, len) ||
603                                     name[len++] != ':' || name[len++] != ':')
604                                         continue;
605                         }
606                         if (strcmp(name + len, tomoyo_mac_keywords[i]))
607                                 continue;
608                         config = profile->config[i];
609                         break;
610                 }
611                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
612                         return -EINVAL;
613         } else {
614                 return -EINVAL;
615         }
616         if (strstr(value, "use_default")) {
617                 config = TOMOYO_CONFIG_USE_DEFAULT;
618         } else {
619                 u8 mode;
620                 for (mode = 0; mode < 4; mode++)
621                         if (strstr(value, tomoyo_mode[mode]))
622                                 /*
623                                  * Update lower 3 bits in order to distinguish
624                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
625                                  */
626                                 config = (config & ~7) | mode;
627                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
628                         switch (tomoyo_find_yesno(value, "grant_log")) {
629                         case 1:
630                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
631                                 break;
632                         case 0:
633                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
634                                 break;
635                         }
636                         switch (tomoyo_find_yesno(value, "reject_log")) {
637                         case 1:
638                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
639                                 break;
640                         case 0:
641                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
642                                 break;
643                         }
644                 }
645         }
646         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
647                 profile->config[i] = config;
648         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
649                 profile->default_config = config;
650         return 0;
651 }
652
653 /**
654  * tomoyo_write_profile - Write profile table.
655  *
656  * @head: Pointer to "struct tomoyo_io_buffer".
657  *
658  * Returns 0 on success, negative value otherwise.
659  */
660 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
661 {
662         char *data = head->write_buf;
663         unsigned int i;
664         char *cp;
665         struct tomoyo_profile *profile;
666         if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
667             == 1)
668                 return 0;
669         i = simple_strtoul(data, &cp, 10);
670         if (*cp != '-')
671                 return -EINVAL;
672         data = cp + 1;
673         profile = tomoyo_assign_profile(head->w.ns, i);
674         if (!profile)
675                 return -EINVAL;
676         cp = strchr(data, '=');
677         if (!cp)
678                 return -EINVAL;
679         *cp++ = '\0';
680         if (!strcmp(data, "COMMENT")) {
681                 static DEFINE_SPINLOCK(lock);
682                 const struct tomoyo_path_info *new_comment
683                         = tomoyo_get_name(cp);
684                 const struct tomoyo_path_info *old_comment;
685                 if (!new_comment)
686                         return -ENOMEM;
687                 spin_lock(&lock);
688                 old_comment = profile->comment;
689                 profile->comment = new_comment;
690                 spin_unlock(&lock);
691                 tomoyo_put_name(old_comment);
692                 return 0;
693         }
694         if (!strcmp(data, "PREFERENCE")) {
695                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
696                         tomoyo_set_uint(&profile->pref[i], cp,
697                                         tomoyo_pref_keywords[i]);
698                 return 0;
699         }
700         return tomoyo_set_mode(data, cp, profile);
701 }
702
703 /**
704  * tomoyo_print_config - Print mode for specified functionality.
705  *
706  * @head:   Pointer to "struct tomoyo_io_buffer".
707  * @config: Mode for that functionality.
708  *
709  * Returns nothing.
710  *
711  * Caller prints functionality's name.
712  */
713 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
714 {
715         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
716                          tomoyo_mode[config & 3],
717                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
718                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
719 }
720
721 /**
722  * tomoyo_read_profile - Read profile table.
723  *
724  * @head: Pointer to "struct tomoyo_io_buffer".
725  *
726  * Returns nothing.
727  */
728 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
729 {
730         u8 index;
731         struct tomoyo_policy_namespace *ns =
732                 container_of(head->r.ns, typeof(*ns), namespace_list);
733         const struct tomoyo_profile *profile;
734         if (head->r.eof)
735                 return;
736  next:
737         index = head->r.index;
738         profile = ns->profile_ptr[index];
739         switch (head->r.step) {
740         case 0:
741                 tomoyo_print_namespace(head);
742                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
743                                  ns->profile_version);
744                 head->r.step++;
745                 break;
746         case 1:
747                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
748                       head->r.index++)
749                         if (ns->profile_ptr[head->r.index])
750                                 break;
751                 if (head->r.index == TOMOYO_MAX_PROFILES) {
752                         head->r.eof = true;
753                         return;
754                 }
755                 head->r.step++;
756                 break;
757         case 2:
758                 {
759                         u8 i;
760                         const struct tomoyo_path_info *comment =
761                                 profile->comment;
762                         tomoyo_print_namespace(head);
763                         tomoyo_io_printf(head, "%u-COMMENT=", index);
764                         tomoyo_set_string(head, comment ? comment->name : "");
765                         tomoyo_set_lf(head);
766                         tomoyo_print_namespace(head);
767                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
768                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
769                                 tomoyo_io_printf(head, "%s=%u ",
770                                                  tomoyo_pref_keywords[i],
771                                                  profile->pref[i]);
772                         tomoyo_set_string(head, "}\n");
773                         head->r.step++;
774                 }
775                 break;
776         case 3:
777                 {
778                         tomoyo_print_namespace(head);
779                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
780                         tomoyo_print_config(head, profile->default_config);
781                         head->r.bit = 0;
782                         head->r.step++;
783                 }
784                 break;
785         case 4:
786                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
787                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
788                         const u8 i = head->r.bit;
789                         const u8 config = profile->config[i];
790                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
791                                 continue;
792                         tomoyo_print_namespace(head);
793                         if (i < TOMOYO_MAX_MAC_INDEX)
794                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
795                                                  index,
796                                                  tomoyo_category_keywords
797                                                  [tomoyo_index2category[i]],
798                                                  tomoyo_mac_keywords[i]);
799                         else
800                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
801                                                  tomoyo_mac_keywords[i]);
802                         tomoyo_print_config(head, config);
803                         head->r.bit++;
804                         break;
805                 }
806                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
807                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
808                         head->r.index++;
809                         head->r.step = 1;
810                 }
811                 break;
812         }
813         if (tomoyo_flush(head))
814                 goto next;
815 }
816
817 /**
818  * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
819  *
820  * @a: Pointer to "struct tomoyo_acl_head".
821  * @b: Pointer to "struct tomoyo_acl_head".
822  *
823  * Returns true if @a == @b, false otherwise.
824  */
825 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
826                                 const struct tomoyo_acl_head *b)
827 {
828         return container_of(a, struct tomoyo_manager, head)->manager ==
829                 container_of(b, struct tomoyo_manager, head)->manager;
830 }
831
832 /**
833  * tomoyo_update_manager_entry - Add a manager entry.
834  *
835  * @manager:   The path to manager or the domainnamme.
836  * @is_delete: True if it is a delete request.
837  *
838  * Returns 0 on success, negative value otherwise.
839  *
840  * Caller holds tomoyo_read_lock().
841  */
842 static int tomoyo_update_manager_entry(const char *manager,
843                                        const bool is_delete)
844 {
845         struct tomoyo_manager e = { };
846         struct tomoyo_acl_param param = {
847                 /* .ns = &tomoyo_kernel_namespace, */
848                 .is_delete = is_delete,
849                 .list = &tomoyo_kernel_namespace.
850                 policy_list[TOMOYO_ID_MANAGER],
851         };
852         int error = is_delete ? -ENOENT : -ENOMEM;
853         if (tomoyo_domain_def(manager)) {
854                 if (!tomoyo_correct_domain(manager))
855                         return -EINVAL;
856                 e.is_domain = true;
857         } else {
858                 if (!tomoyo_correct_path(manager))
859                         return -EINVAL;
860         }
861         e.manager = tomoyo_get_name(manager);
862         if (e.manager) {
863                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
864                                              tomoyo_same_manager);
865                 tomoyo_put_name(e.manager);
866         }
867         return error;
868 }
869
870 /**
871  * tomoyo_write_manager - Write manager policy.
872  *
873  * @head: Pointer to "struct tomoyo_io_buffer".
874  *
875  * Returns 0 on success, negative value otherwise.
876  *
877  * Caller holds tomoyo_read_lock().
878  */
879 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
880 {
881         char *data = head->write_buf;
882
883         if (!strcmp(data, "manage_by_non_root")) {
884                 tomoyo_manage_by_non_root = !head->w.is_delete;
885                 return 0;
886         }
887         return tomoyo_update_manager_entry(data, head->w.is_delete);
888 }
889
890 /**
891  * tomoyo_read_manager - Read manager policy.
892  *
893  * @head: Pointer to "struct tomoyo_io_buffer".
894  *
895  * Caller holds tomoyo_read_lock().
896  */
897 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
898 {
899         if (head->r.eof)
900                 return;
901         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
902                              policy_list[TOMOYO_ID_MANAGER]) {
903                 struct tomoyo_manager *ptr =
904                         list_entry(head->r.acl, typeof(*ptr), head.list);
905                 if (ptr->head.is_deleted)
906                         continue;
907                 if (!tomoyo_flush(head))
908                         return;
909                 tomoyo_set_string(head, ptr->manager->name);
910                 tomoyo_set_lf(head);
911         }
912         head->r.eof = true;
913 }
914
915 /**
916  * tomoyo_manager - Check whether the current process is a policy manager.
917  *
918  * Returns true if the current process is permitted to modify policy
919  * via /sys/kernel/security/tomoyo/ interface.
920  *
921  * Caller holds tomoyo_read_lock().
922  */
923 static bool tomoyo_manager(void)
924 {
925         struct tomoyo_manager *ptr;
926         const char *exe;
927         const struct task_struct *task = current;
928         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
929         bool found = false;
930
931         if (!tomoyo_policy_loaded)
932                 return true;
933         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
934                 return false;
935         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
936                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
937                 if (!ptr->head.is_deleted && ptr->is_domain
938                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
939                         found = true;
940                         break;
941                 }
942         }
943         if (found)
944                 return true;
945         exe = tomoyo_get_exe();
946         if (!exe)
947                 return false;
948         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
949                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
950                 if (!ptr->head.is_deleted && !ptr->is_domain
951                     && !strcmp(exe, ptr->manager->name)) {
952                         found = true;
953                         break;
954                 }
955         }
956         if (!found) { /* Reduce error messages. */
957                 static pid_t last_pid;
958                 const pid_t pid = current->pid;
959                 if (last_pid != pid) {
960                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
961                                "update policies.\n", domainname->name, exe);
962                         last_pid = pid;
963                 }
964         }
965         kfree(exe);
966         return found;
967 }
968
969 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
970 (unsigned int serial);
971
972 /**
973  * tomoyo_select_domain - Parse select command.
974  *
975  * @head: Pointer to "struct tomoyo_io_buffer".
976  * @data: String to parse.
977  *
978  * Returns true on success, false otherwise.
979  *
980  * Caller holds tomoyo_read_lock().
981  */
982 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
983                                  const char *data)
984 {
985         unsigned int pid;
986         struct tomoyo_domain_info *domain = NULL;
987         bool global_pid = false;
988         if (strncmp(data, "select ", 7))
989                 return false;
990         data += 7;
991         if (sscanf(data, "pid=%u", &pid) == 1 ||
992             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
993                 struct task_struct *p;
994                 rcu_read_lock();
995                 if (global_pid)
996                         p = find_task_by_pid_ns(pid, &init_pid_ns);
997                 else
998                         p = find_task_by_vpid(pid);
999                 if (p)
1000                         domain = tomoyo_real_domain(p);
1001                 rcu_read_unlock();
1002         } else if (!strncmp(data, "domain=", 7)) {
1003                 if (tomoyo_domain_def(data + 7))
1004                         domain = tomoyo_find_domain(data + 7);
1005         } else if (sscanf(data, "Q=%u", &pid) == 1) {
1006                 domain = tomoyo_find_domain_by_qid(pid);
1007         } else
1008                 return false;
1009         head->w.domain = domain;
1010         /* Accessing read_buf is safe because head->io_sem is held. */
1011         if (!head->read_buf)
1012                 return true; /* Do nothing if open(O_WRONLY). */
1013         memset(&head->r, 0, sizeof(head->r));
1014         head->r.print_this_domain_only = true;
1015         if (domain)
1016                 head->r.domain = &domain->list;
1017         else
1018                 head->r.eof = 1;
1019         tomoyo_io_printf(head, "# select %s\n", data);
1020         if (domain && domain->is_deleted)
1021                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1022         return true;
1023 }
1024
1025 /**
1026  * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1027  *
1028  * @a: Pointer to "struct tomoyo_acl_info".
1029  * @b: Pointer to "struct tomoyo_acl_info".
1030  *
1031  * Returns true if @a == @b, false otherwise.
1032  */
1033 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1034                               const struct tomoyo_acl_info *b)
1035 {
1036         const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1037         const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1038         return p1->domainname == p2->domainname;
1039 }
1040
1041 /**
1042  * tomoyo_write_task - Update task related list.
1043  *
1044  * @param: Pointer to "struct tomoyo_acl_param".
1045  *
1046  * Returns 0 on success, negative value otherwise.
1047  *
1048  * Caller holds tomoyo_read_lock().
1049  */
1050 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1051 {
1052         int error = -EINVAL;
1053         if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1054                 struct tomoyo_task_acl e = {
1055                         .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1056                         .domainname = tomoyo_get_domainname(param),
1057                 };
1058                 if (e.domainname)
1059                         error = tomoyo_update_domain(&e.head, sizeof(e), param,
1060                                                      tomoyo_same_task_acl,
1061                                                      NULL);
1062                 tomoyo_put_name(e.domainname);
1063         }
1064         return error;
1065 }
1066
1067 /**
1068  * tomoyo_delete_domain - Delete a domain.
1069  *
1070  * @domainname: The name of domain.
1071  *
1072  * Returns 0 on success, negative value otherwise.
1073  *
1074  * Caller holds tomoyo_read_lock().
1075  */
1076 static int tomoyo_delete_domain(char *domainname)
1077 {
1078         struct tomoyo_domain_info *domain;
1079         struct tomoyo_path_info name;
1080
1081         name.name = domainname;
1082         tomoyo_fill_path_info(&name);
1083         if (mutex_lock_interruptible(&tomoyo_policy_lock))
1084                 return -EINTR;
1085         /* Is there an active domain? */
1086         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1087                 /* Never delete tomoyo_kernel_domain */
1088                 if (domain == &tomoyo_kernel_domain)
1089                         continue;
1090                 if (domain->is_deleted ||
1091                     tomoyo_pathcmp(domain->domainname, &name))
1092                         continue;
1093                 domain->is_deleted = true;
1094                 break;
1095         }
1096         mutex_unlock(&tomoyo_policy_lock);
1097         return 0;
1098 }
1099
1100 /**
1101  * tomoyo_write_domain2 - Write domain policy.
1102  *
1103  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1104  * @list:      Pointer to "struct list_head".
1105  * @data:      Policy to be interpreted.
1106  * @is_delete: True if it is a delete request.
1107  *
1108  * Returns 0 on success, negative value otherwise.
1109  *
1110  * Caller holds tomoyo_read_lock().
1111  */
1112 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1113                                 struct list_head *list, char *data,
1114                                 const bool is_delete)
1115 {
1116         struct tomoyo_acl_param param = {
1117                 .ns = ns,
1118                 .list = list,
1119                 .data = data,
1120                 .is_delete = is_delete,
1121         };
1122         static const struct {
1123                 const char *keyword;
1124                 int (*write) (struct tomoyo_acl_param *);
1125         } tomoyo_callback[5] = {
1126                 { "file ", tomoyo_write_file },
1127                 { "network inet ", tomoyo_write_inet_network },
1128                 { "network unix ", tomoyo_write_unix_network },
1129                 { "misc ", tomoyo_write_misc },
1130                 { "task ", tomoyo_write_task },
1131         };
1132         u8 i;
1133
1134         for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1135                 if (!tomoyo_str_starts(&param.data,
1136                                        tomoyo_callback[i].keyword))
1137                         continue;
1138                 return tomoyo_callback[i].write(&param);
1139         }
1140         return -EINVAL;
1141 }
1142
1143 /* String table for domain flags. */
1144 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1145         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1146         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1147 };
1148
1149 /**
1150  * tomoyo_write_domain - Write domain policy.
1151  *
1152  * @head: Pointer to "struct tomoyo_io_buffer".
1153  *
1154  * Returns 0 on success, negative value otherwise.
1155  *
1156  * Caller holds tomoyo_read_lock().
1157  */
1158 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1159 {
1160         char *data = head->write_buf;
1161         struct tomoyo_policy_namespace *ns;
1162         struct tomoyo_domain_info *domain = head->w.domain;
1163         const bool is_delete = head->w.is_delete;
1164         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1165         unsigned int profile;
1166         if (*data == '<') {
1167                 int ret = 0;
1168                 domain = NULL;
1169                 if (is_delete)
1170                         ret = tomoyo_delete_domain(data);
1171                 else if (is_select)
1172                         domain = tomoyo_find_domain(data);
1173                 else
1174                         domain = tomoyo_assign_domain(data, false);
1175                 head->w.domain = domain;
1176                 return ret;
1177         }
1178         if (!domain)
1179                 return -EINVAL;
1180         ns = domain->ns;
1181         if (sscanf(data, "use_profile %u", &profile) == 1
1182             && profile < TOMOYO_MAX_PROFILES) {
1183                 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1184                         domain->profile = (u8) profile;
1185                 return 0;
1186         }
1187         if (sscanf(data, "use_group %u\n", &profile) == 1
1188             && profile < TOMOYO_MAX_ACL_GROUPS) {
1189                 if (!is_delete)
1190                         domain->group = (u8) profile;
1191                 return 0;
1192         }
1193         for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1194                 const char *cp = tomoyo_dif[profile];
1195                 if (strncmp(data, cp, strlen(cp) - 1))
1196                         continue;
1197                 domain->flags[profile] = !is_delete;
1198                 return 0;
1199         }
1200         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1201                                     is_delete);
1202 }
1203
1204 /**
1205  * tomoyo_print_condition - Print condition part.
1206  *
1207  * @head: Pointer to "struct tomoyo_io_buffer".
1208  * @cond: Pointer to "struct tomoyo_condition".
1209  *
1210  * Returns true on success, false otherwise.
1211  */
1212 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1213                                    const struct tomoyo_condition *cond)
1214 {
1215         switch (head->r.cond_step) {
1216         case 0:
1217                 head->r.cond_index = 0;
1218                 head->r.cond_step++;
1219                 if (cond->transit) {
1220                         tomoyo_set_space(head);
1221                         tomoyo_set_string(head, cond->transit->name);
1222                 }
1223                 /* fall through */
1224         case 1:
1225                 {
1226                         const u16 condc = cond->condc;
1227                         const struct tomoyo_condition_element *condp =
1228                                 (typeof(condp)) (cond + 1);
1229                         const struct tomoyo_number_union *numbers_p =
1230                                 (typeof(numbers_p)) (condp + condc);
1231                         const struct tomoyo_name_union *names_p =
1232                                 (typeof(names_p))
1233                                 (numbers_p + cond->numbers_count);
1234                         const struct tomoyo_argv *argv =
1235                                 (typeof(argv)) (names_p + cond->names_count);
1236                         const struct tomoyo_envp *envp =
1237                                 (typeof(envp)) (argv + cond->argc);
1238                         u16 skip;
1239                         for (skip = 0; skip < head->r.cond_index; skip++) {
1240                                 const u8 left = condp->left;
1241                                 const u8 right = condp->right;
1242                                 condp++;
1243                                 switch (left) {
1244                                 case TOMOYO_ARGV_ENTRY:
1245                                         argv++;
1246                                         continue;
1247                                 case TOMOYO_ENVP_ENTRY:
1248                                         envp++;
1249                                         continue;
1250                                 case TOMOYO_NUMBER_UNION:
1251                                         numbers_p++;
1252                                         break;
1253                                 }
1254                                 switch (right) {
1255                                 case TOMOYO_NAME_UNION:
1256                                         names_p++;
1257                                         break;
1258                                 case TOMOYO_NUMBER_UNION:
1259                                         numbers_p++;
1260                                         break;
1261                                 }
1262                         }
1263                         while (head->r.cond_index < condc) {
1264                                 const u8 match = condp->equals;
1265                                 const u8 left = condp->left;
1266                                 const u8 right = condp->right;
1267                                 if (!tomoyo_flush(head))
1268                                         return false;
1269                                 condp++;
1270                                 head->r.cond_index++;
1271                                 tomoyo_set_space(head);
1272                                 switch (left) {
1273                                 case TOMOYO_ARGV_ENTRY:
1274                                         tomoyo_io_printf(head,
1275                                                          "exec.argv[%lu]%s=\"",
1276                                                          argv->index, argv->
1277                                                          is_not ? "!" : "");
1278                                         tomoyo_set_string(head,
1279                                                           argv->value->name);
1280                                         tomoyo_set_string(head, "\"");
1281                                         argv++;
1282                                         continue;
1283                                 case TOMOYO_ENVP_ENTRY:
1284                                         tomoyo_set_string(head,
1285                                                           "exec.envp[\"");
1286                                         tomoyo_set_string(head,
1287                                                           envp->name->name);
1288                                         tomoyo_io_printf(head, "\"]%s=", envp->
1289                                                          is_not ? "!" : "");
1290                                         if (envp->value) {
1291                                                 tomoyo_set_string(head, "\"");
1292                                                 tomoyo_set_string(head, envp->
1293                                                                   value->name);
1294                                                 tomoyo_set_string(head, "\"");
1295                                         } else {
1296                                                 tomoyo_set_string(head,
1297                                                                   "NULL");
1298                                         }
1299                                         envp++;
1300                                         continue;
1301                                 case TOMOYO_NUMBER_UNION:
1302                                         tomoyo_print_number_union_nospace
1303                                                 (head, numbers_p++);
1304                                         break;
1305                                 default:
1306                                         tomoyo_set_string(head,
1307                                                tomoyo_condition_keyword[left]);
1308                                         break;
1309                                 }
1310                                 tomoyo_set_string(head, match ? "=" : "!=");
1311                                 switch (right) {
1312                                 case TOMOYO_NAME_UNION:
1313                                         tomoyo_print_name_union_quoted
1314                                                 (head, names_p++);
1315                                         break;
1316                                 case TOMOYO_NUMBER_UNION:
1317                                         tomoyo_print_number_union_nospace
1318                                                 (head, numbers_p++);
1319                                         break;
1320                                 default:
1321                                         tomoyo_set_string(head,
1322                                           tomoyo_condition_keyword[right]);
1323                                         break;
1324                                 }
1325                         }
1326                 }
1327                 head->r.cond_step++;
1328                 /* fall through */
1329         case 2:
1330                 if (!tomoyo_flush(head))
1331                         break;
1332                 head->r.cond_step++;
1333                 /* fall through */
1334         case 3:
1335                 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1336                         tomoyo_io_printf(head, " grant_log=%s",
1337                                          tomoyo_yesno(cond->grant_log ==
1338                                                       TOMOYO_GRANTLOG_YES));
1339                 tomoyo_set_lf(head);
1340                 return true;
1341         }
1342         return false;
1343 }
1344
1345 /**
1346  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1347  *
1348  * @head:     Pointer to "struct tomoyo_io_buffer".
1349  * @category: Category name.
1350  *
1351  * Returns nothing.
1352  */
1353 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1354                              const char *category)
1355 {
1356         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1357                 tomoyo_print_namespace(head);
1358                 tomoyo_io_printf(head, "acl_group %u ",
1359                                  head->r.acl_group_index);
1360         }
1361         tomoyo_set_string(head, category);
1362 }
1363
1364 /**
1365  * tomoyo_print_entry - Print an ACL entry.
1366  *
1367  * @head: Pointer to "struct tomoyo_io_buffer".
1368  * @acl:  Pointer to an ACL entry.
1369  *
1370  * Returns true on success, false otherwise.
1371  */
1372 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1373                                struct tomoyo_acl_info *acl)
1374 {
1375         const u8 acl_type = acl->type;
1376         bool first = true;
1377         u8 bit;
1378
1379         if (head->r.print_cond_part)
1380                 goto print_cond_part;
1381         if (acl->is_deleted)
1382                 return true;
1383         if (!tomoyo_flush(head))
1384                 return false;
1385         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1386                 struct tomoyo_path_acl *ptr =
1387                         container_of(acl, typeof(*ptr), head);
1388                 const u16 perm = ptr->perm;
1389                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1390                         if (!(perm & (1 << bit)))
1391                                 continue;
1392                         if (head->r.print_transition_related_only &&
1393                             bit != TOMOYO_TYPE_EXECUTE)
1394                                 continue;
1395                         if (first) {
1396                                 tomoyo_set_group(head, "file ");
1397                                 first = false;
1398                         } else {
1399                                 tomoyo_set_slash(head);
1400                         }
1401                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1402                 }
1403                 if (first)
1404                         return true;
1405                 tomoyo_print_name_union(head, &ptr->name);
1406         } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1407                 struct tomoyo_task_acl *ptr =
1408                         container_of(acl, typeof(*ptr), head);
1409                 tomoyo_set_group(head, "task ");
1410                 tomoyo_set_string(head, "manual_domain_transition ");
1411                 tomoyo_set_string(head, ptr->domainname->name);
1412         } else if (head->r.print_transition_related_only) {
1413                 return true;
1414         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1415                 struct tomoyo_path2_acl *ptr =
1416                         container_of(acl, typeof(*ptr), head);
1417                 const u8 perm = ptr->perm;
1418                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1419                         if (!(perm & (1 << bit)))
1420                                 continue;
1421                         if (first) {
1422                                 tomoyo_set_group(head, "file ");
1423                                 first = false;
1424                         } else {
1425                                 tomoyo_set_slash(head);
1426                         }
1427                         tomoyo_set_string(head, tomoyo_mac_keywords
1428                                           [tomoyo_pp2mac[bit]]);
1429                 }
1430                 if (first)
1431                         return true;
1432                 tomoyo_print_name_union(head, &ptr->name1);
1433                 tomoyo_print_name_union(head, &ptr->name2);
1434         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1435                 struct tomoyo_path_number_acl *ptr =
1436                         container_of(acl, typeof(*ptr), head);
1437                 const u8 perm = ptr->perm;
1438                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1439                         if (!(perm & (1 << bit)))
1440                                 continue;
1441                         if (first) {
1442                                 tomoyo_set_group(head, "file ");
1443                                 first = false;
1444                         } else {
1445                                 tomoyo_set_slash(head);
1446                         }
1447                         tomoyo_set_string(head, tomoyo_mac_keywords
1448                                           [tomoyo_pn2mac[bit]]);
1449                 }
1450                 if (first)
1451                         return true;
1452                 tomoyo_print_name_union(head, &ptr->name);
1453                 tomoyo_print_number_union(head, &ptr->number);
1454         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1455                 struct tomoyo_mkdev_acl *ptr =
1456                         container_of(acl, typeof(*ptr), head);
1457                 const u8 perm = ptr->perm;
1458                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1459                         if (!(perm & (1 << bit)))
1460                                 continue;
1461                         if (first) {
1462                                 tomoyo_set_group(head, "file ");
1463                                 first = false;
1464                         } else {
1465                                 tomoyo_set_slash(head);
1466                         }
1467                         tomoyo_set_string(head, tomoyo_mac_keywords
1468                                           [tomoyo_pnnn2mac[bit]]);
1469                 }
1470                 if (first)
1471                         return true;
1472                 tomoyo_print_name_union(head, &ptr->name);
1473                 tomoyo_print_number_union(head, &ptr->mode);
1474                 tomoyo_print_number_union(head, &ptr->major);
1475                 tomoyo_print_number_union(head, &ptr->minor);
1476         } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1477                 struct tomoyo_inet_acl *ptr =
1478                         container_of(acl, typeof(*ptr), head);
1479                 const u8 perm = ptr->perm;
1480
1481                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1482                         if (!(perm & (1 << bit)))
1483                                 continue;
1484                         if (first) {
1485                                 tomoyo_set_group(head, "network inet ");
1486                                 tomoyo_set_string(head, tomoyo_proto_keyword
1487                                                   [ptr->protocol]);
1488                                 tomoyo_set_space(head);
1489                                 first = false;
1490                         } else {
1491                                 tomoyo_set_slash(head);
1492                         }
1493                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1494                 }
1495                 if (first)
1496                         return true;
1497                 tomoyo_set_space(head);
1498                 if (ptr->address.group) {
1499                         tomoyo_set_string(head, "@");
1500                         tomoyo_set_string(head, ptr->address.group->group_name
1501                                           ->name);
1502                 } else {
1503                         char buf[128];
1504                         tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1505                         tomoyo_io_printf(head, "%s", buf);
1506                 }
1507                 tomoyo_print_number_union(head, &ptr->port);
1508         } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1509                 struct tomoyo_unix_acl *ptr =
1510                         container_of(acl, typeof(*ptr), head);
1511                 const u8 perm = ptr->perm;
1512
1513                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1514                         if (!(perm & (1 << bit)))
1515                                 continue;
1516                         if (first) {
1517                                 tomoyo_set_group(head, "network unix ");
1518                                 tomoyo_set_string(head, tomoyo_proto_keyword
1519                                                   [ptr->protocol]);
1520                                 tomoyo_set_space(head);
1521                                 first = false;
1522                         } else {
1523                                 tomoyo_set_slash(head);
1524                         }
1525                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1526                 }
1527                 if (first)
1528                         return true;
1529                 tomoyo_print_name_union(head, &ptr->name);
1530         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1531                 struct tomoyo_mount_acl *ptr =
1532                         container_of(acl, typeof(*ptr), head);
1533                 tomoyo_set_group(head, "file mount");
1534                 tomoyo_print_name_union(head, &ptr->dev_name);
1535                 tomoyo_print_name_union(head, &ptr->dir_name);
1536                 tomoyo_print_name_union(head, &ptr->fs_type);
1537                 tomoyo_print_number_union(head, &ptr->flags);
1538         } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1539                 struct tomoyo_env_acl *ptr =
1540                         container_of(acl, typeof(*ptr), head);
1541
1542                 tomoyo_set_group(head, "misc env ");
1543                 tomoyo_set_string(head, ptr->env->name);
1544         }
1545         if (acl->cond) {
1546                 head->r.print_cond_part = true;
1547                 head->r.cond_step = 0;
1548                 if (!tomoyo_flush(head))
1549                         return false;
1550 print_cond_part:
1551                 if (!tomoyo_print_condition(head, acl->cond))
1552                         return false;
1553                 head->r.print_cond_part = false;
1554         } else {
1555                 tomoyo_set_lf(head);
1556         }
1557         return true;
1558 }
1559
1560 /**
1561  * tomoyo_read_domain2 - Read domain policy.
1562  *
1563  * @head: Pointer to "struct tomoyo_io_buffer".
1564  * @list: Pointer to "struct list_head".
1565  *
1566  * Caller holds tomoyo_read_lock().
1567  *
1568  * Returns true on success, false otherwise.
1569  */
1570 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1571                                 struct list_head *list)
1572 {
1573         list_for_each_cookie(head->r.acl, list) {
1574                 struct tomoyo_acl_info *ptr =
1575                         list_entry(head->r.acl, typeof(*ptr), list);
1576                 if (!tomoyo_print_entry(head, ptr))
1577                         return false;
1578         }
1579         head->r.acl = NULL;
1580         return true;
1581 }
1582
1583 /**
1584  * tomoyo_read_domain - Read domain policy.
1585  *
1586  * @head: Pointer to "struct tomoyo_io_buffer".
1587  *
1588  * Caller holds tomoyo_read_lock().
1589  */
1590 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1591 {
1592         if (head->r.eof)
1593                 return;
1594         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1595                 struct tomoyo_domain_info *domain =
1596                         list_entry(head->r.domain, typeof(*domain), list);
1597                 switch (head->r.step) {
1598                         u8 i;
1599                 case 0:
1600                         if (domain->is_deleted &&
1601                             !head->r.print_this_domain_only)
1602                                 continue;
1603                         /* Print domainname and flags. */
1604                         tomoyo_set_string(head, domain->domainname->name);
1605                         tomoyo_set_lf(head);
1606                         tomoyo_io_printf(head, "use_profile %u\n",
1607                                          domain->profile);
1608                         tomoyo_io_printf(head, "use_group %u\n",
1609                                          domain->group);
1610                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1611                                 if (domain->flags[i])
1612                                         tomoyo_set_string(head, tomoyo_dif[i]);
1613                         head->r.step++;
1614                         tomoyo_set_lf(head);
1615                         /* fall through */
1616                 case 1:
1617                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1618                                 return;
1619                         head->r.step++;
1620                         if (!tomoyo_set_lf(head))
1621                                 return;
1622                         /* fall through */
1623                 case 2:
1624                         head->r.step = 0;
1625                         if (head->r.print_this_domain_only)
1626                                 goto done;
1627                 }
1628         }
1629  done:
1630         head->r.eof = true;
1631 }
1632
1633 /**
1634  * tomoyo_write_pid: Specify PID to obtain domainname.
1635  *
1636  * @head: Pointer to "struct tomoyo_io_buffer".
1637  *
1638  * Returns 0.
1639  */
1640 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1641 {
1642         head->r.eof = false;
1643         return 0;
1644 }
1645
1646 /**
1647  * tomoyo_read_pid - Get domainname of the specified PID.
1648  *
1649  * @head: Pointer to "struct tomoyo_io_buffer".
1650  *
1651  * Returns the domainname which the specified PID is in on success,
1652  * empty string otherwise.
1653  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1654  * using read()/write() interface rather than sysctl() interface.
1655  */
1656 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1657 {
1658         char *buf = head->write_buf;
1659         bool global_pid = false;
1660         unsigned int pid;
1661         struct task_struct *p;
1662         struct tomoyo_domain_info *domain = NULL;
1663
1664         /* Accessing write_buf is safe because head->io_sem is held. */
1665         if (!buf) {
1666                 head->r.eof = true;
1667                 return; /* Do nothing if open(O_RDONLY). */
1668         }
1669         if (head->r.w_pos || head->r.eof)
1670                 return;
1671         head->r.eof = true;
1672         if (tomoyo_str_starts(&buf, "global-pid "))
1673                 global_pid = true;
1674         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1675         rcu_read_lock();
1676         if (global_pid)
1677                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1678         else
1679                 p = find_task_by_vpid(pid);
1680         if (p)
1681                 domain = tomoyo_real_domain(p);
1682         rcu_read_unlock();
1683         if (!domain)
1684                 return;
1685         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1686         tomoyo_set_string(head, domain->domainname->name);
1687 }
1688
1689 /* String table for domain transition control keywords. */
1690 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1691         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1692         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1693         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1694         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1695         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1696         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1697 };
1698
1699 /* String table for grouping keywords. */
1700 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1701         [TOMOYO_PATH_GROUP]    = "path_group ",
1702         [TOMOYO_NUMBER_GROUP]  = "number_group ",
1703         [TOMOYO_ADDRESS_GROUP] = "address_group ",
1704 };
1705
1706 /**
1707  * tomoyo_write_exception - Write exception policy.
1708  *
1709  * @head: Pointer to "struct tomoyo_io_buffer".
1710  *
1711  * Returns 0 on success, negative value otherwise.
1712  *
1713  * Caller holds tomoyo_read_lock().
1714  */
1715 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1716 {
1717         const bool is_delete = head->w.is_delete;
1718         struct tomoyo_acl_param param = {
1719                 .ns = head->w.ns,
1720                 .is_delete = is_delete,
1721                 .data = head->write_buf,
1722         };
1723         u8 i;
1724         if (tomoyo_str_starts(&param.data, "aggregator "))
1725                 return tomoyo_write_aggregator(&param);
1726         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1727                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1728                         return tomoyo_write_transition_control(&param, i);
1729         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1730                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1731                         return tomoyo_write_group(&param, i);
1732         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1733                 unsigned int group;
1734                 char *data;
1735                 group = simple_strtoul(param.data, &data, 10);
1736                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1737                         return tomoyo_write_domain2
1738                                 (head->w.ns, &head->w.ns->acl_group[group],
1739                                  data, is_delete);
1740         }
1741         return -EINVAL;
1742 }
1743
1744 /**
1745  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1746  *
1747  * @head: Pointer to "struct tomoyo_io_buffer".
1748  * @idx:  Index number.
1749  *
1750  * Returns true on success, false otherwise.
1751  *
1752  * Caller holds tomoyo_read_lock().
1753  */
1754 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1755 {
1756         struct tomoyo_policy_namespace *ns =
1757                 container_of(head->r.ns, typeof(*ns), namespace_list);
1758         struct list_head *list = &ns->group_list[idx];
1759         list_for_each_cookie(head->r.group, list) {
1760                 struct tomoyo_group *group =
1761                         list_entry(head->r.group, typeof(*group), head.list);
1762                 list_for_each_cookie(head->r.acl, &group->member_list) {
1763                         struct tomoyo_acl_head *ptr =
1764                                 list_entry(head->r.acl, typeof(*ptr), list);
1765                         if (ptr->is_deleted)
1766                                 continue;
1767                         if (!tomoyo_flush(head))
1768                                 return false;
1769                         tomoyo_print_namespace(head);
1770                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1771                         tomoyo_set_string(head, group->group_name->name);
1772                         if (idx == TOMOYO_PATH_GROUP) {
1773                                 tomoyo_set_space(head);
1774                                 tomoyo_set_string(head, container_of
1775                                                (ptr, struct tomoyo_path_group,
1776                                                 head)->member_name->name);
1777                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1778                                 tomoyo_print_number_union(head, &container_of
1779                                                           (ptr,
1780                                                    struct tomoyo_number_group,
1781                                                            head)->number);
1782                         } else if (idx == TOMOYO_ADDRESS_GROUP) {
1783                                 char buffer[128];
1784
1785                                 struct tomoyo_address_group *member =
1786                                         container_of(ptr, typeof(*member),
1787                                                      head);
1788                                 tomoyo_print_ip(buffer, sizeof(buffer),
1789                                                 &member->address);
1790                                 tomoyo_io_printf(head, " %s", buffer);
1791                         }
1792                         tomoyo_set_lf(head);
1793                 }
1794                 head->r.acl = NULL;
1795         }
1796         head->r.group = NULL;
1797         return true;
1798 }
1799
1800 /**
1801  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1802  *
1803  * @head: Pointer to "struct tomoyo_io_buffer".
1804  * @idx:  Index number.
1805  *
1806  * Returns true on success, false otherwise.
1807  *
1808  * Caller holds tomoyo_read_lock().
1809  */
1810 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1811 {
1812         struct tomoyo_policy_namespace *ns =
1813                 container_of(head->r.ns, typeof(*ns), namespace_list);
1814         struct list_head *list = &ns->policy_list[idx];
1815         list_for_each_cookie(head->r.acl, list) {
1816                 struct tomoyo_acl_head *acl =
1817                         container_of(head->r.acl, typeof(*acl), list);
1818                 if (acl->is_deleted)
1819                         continue;
1820                 if (!tomoyo_flush(head))
1821                         return false;
1822                 switch (idx) {
1823                 case TOMOYO_ID_TRANSITION_CONTROL:
1824                         {
1825                                 struct tomoyo_transition_control *ptr =
1826                                         container_of(acl, typeof(*ptr), head);
1827                                 tomoyo_print_namespace(head);
1828                                 tomoyo_set_string(head, tomoyo_transition_type
1829                                                   [ptr->type]);
1830                                 tomoyo_set_string(head, ptr->program ?
1831                                                   ptr->program->name : "any");
1832                                 tomoyo_set_string(head, " from ");
1833                                 tomoyo_set_string(head, ptr->domainname ?
1834                                                   ptr->domainname->name :
1835                                                   "any");
1836                         }
1837                         break;
1838                 case TOMOYO_ID_AGGREGATOR:
1839                         {
1840                                 struct tomoyo_aggregator *ptr =
1841                                         container_of(acl, typeof(*ptr), head);
1842                                 tomoyo_print_namespace(head);
1843                                 tomoyo_set_string(head, "aggregator ");
1844                                 tomoyo_set_string(head,
1845                                                   ptr->original_name->name);
1846                                 tomoyo_set_space(head);
1847                                 tomoyo_set_string(head,
1848                                                ptr->aggregated_name->name);
1849                         }
1850                         break;
1851                 default:
1852                         continue;
1853                 }
1854                 tomoyo_set_lf(head);
1855         }
1856         head->r.acl = NULL;
1857         return true;
1858 }
1859
1860 /**
1861  * tomoyo_read_exception - Read exception policy.
1862  *
1863  * @head: Pointer to "struct tomoyo_io_buffer".
1864  *
1865  * Caller holds tomoyo_read_lock().
1866  */
1867 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1868 {
1869         struct tomoyo_policy_namespace *ns =
1870                 container_of(head->r.ns, typeof(*ns), namespace_list);
1871         if (head->r.eof)
1872                 return;
1873         while (head->r.step < TOMOYO_MAX_POLICY &&
1874                tomoyo_read_policy(head, head->r.step))
1875                 head->r.step++;
1876         if (head->r.step < TOMOYO_MAX_POLICY)
1877                 return;
1878         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1879                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1880                 head->r.step++;
1881         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1882                 return;
1883         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1884                + TOMOYO_MAX_ACL_GROUPS) {
1885                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1886                         - TOMOYO_MAX_GROUP;
1887                 if (!tomoyo_read_domain2(head, &ns->acl_group
1888                                          [head->r.acl_group_index]))
1889                         return;
1890                 head->r.step++;
1891         }
1892         head->r.eof = true;
1893 }
1894
1895 /* Wait queue for kernel -> userspace notification. */
1896 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1897 /* Wait queue for userspace -> kernel notification. */
1898 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1899
1900 /* Structure for query. */
1901 struct tomoyo_query {
1902         struct list_head list;
1903         struct tomoyo_domain_info *domain;
1904         char *query;
1905         size_t query_len;
1906         unsigned int serial;
1907         u8 timer;
1908         u8 answer;
1909         u8 retry;
1910 };
1911
1912 /* The list for "struct tomoyo_query". */
1913 static LIST_HEAD(tomoyo_query_list);
1914
1915 /* Lock for manipulating tomoyo_query_list. */
1916 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1917
1918 /*
1919  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1920  * interface.
1921  */
1922 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1923
1924 /**
1925  * tomoyo_truncate - Truncate a line.
1926  *
1927  * @str: String to truncate.
1928  *
1929  * Returns length of truncated @str.
1930  */
1931 static int tomoyo_truncate(char *str)
1932 {
1933         char *start = str;
1934         while (*(unsigned char *) str > (unsigned char) ' ')
1935                 str++;
1936         *str = '\0';
1937         return strlen(start) + 1;
1938 }
1939
1940 /**
1941  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1942  *
1943  * @domain: Pointer to "struct tomoyo_domain_info".
1944  * @header: Lines containing ACL.
1945  *
1946  * Returns nothing.
1947  */
1948 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1949 {
1950         char *buffer;
1951         char *realpath = NULL;
1952         char *argv0 = NULL;
1953         char *symlink = NULL;
1954         char *cp = strchr(header, '\n');
1955         int len;
1956         if (!cp)
1957                 return;
1958         cp = strchr(cp + 1, '\n');
1959         if (!cp)
1960                 return;
1961         *cp++ = '\0';
1962         len = strlen(cp) + 1;
1963         /* strstr() will return NULL if ordering is wrong. */
1964         if (*cp == 'f') {
1965                 argv0 = strstr(header, " argv[]={ \"");
1966                 if (argv0) {
1967                         argv0 += 10;
1968                         len += tomoyo_truncate(argv0) + 14;
1969                 }
1970                 realpath = strstr(header, " exec={ realpath=\"");
1971                 if (realpath) {
1972                         realpath += 8;
1973                         len += tomoyo_truncate(realpath) + 6;
1974                 }
1975                 symlink = strstr(header, " symlink.target=\"");
1976                 if (symlink)
1977                         len += tomoyo_truncate(symlink + 1) + 1;
1978         }
1979         buffer = kmalloc(len, GFP_NOFS);
1980         if (!buffer)
1981                 return;
1982         snprintf(buffer, len - 1, "%s", cp);
1983         if (realpath)
1984                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1985         if (argv0)
1986                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1987         if (symlink)
1988                 tomoyo_addprintf(buffer, len, "%s", symlink);
1989         tomoyo_normalize_line(buffer);
1990         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1991                                   false))
1992                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1993         kfree(buffer);
1994 }
1995
1996 /**
1997  * tomoyo_supervisor - Ask for the supervisor's decision.
1998  *
1999  * @r:   Pointer to "struct tomoyo_request_info".
2000  * @fmt: The printf()'s format string, followed by parameters.
2001  *
2002  * Returns 0 if the supervisor decided to permit the access request which
2003  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2004  * supervisor decided to retry the access request which violated the policy in
2005  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2006  */
2007 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2008 {
2009         va_list args;
2010         int error;
2011         int len;
2012         static unsigned int tomoyo_serial;
2013         struct tomoyo_query entry = { };
2014         bool quota_exceeded = false;
2015         va_start(args, fmt);
2016         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2017         va_end(args);
2018         /* Write /sys/kernel/security/tomoyo/audit. */
2019         va_start(args, fmt);
2020         tomoyo_write_log2(r, len, fmt, args);
2021         va_end(args);
2022         /* Nothing more to do if granted. */
2023         if (r->granted)
2024                 return 0;
2025         if (r->mode)
2026                 tomoyo_update_stat(r->mode);
2027         switch (r->mode) {
2028         case TOMOYO_CONFIG_ENFORCING:
2029                 error = -EPERM;
2030                 if (atomic_read(&tomoyo_query_observers))
2031                         break;
2032                 goto out;
2033         case TOMOYO_CONFIG_LEARNING:
2034                 error = 0;
2035                 /* Check max_learning_entry parameter. */
2036                 if (tomoyo_domain_quota_is_ok(r))
2037                         break;
2038                 /* fall through */
2039         default:
2040                 return 0;
2041         }
2042         /* Get message. */
2043         va_start(args, fmt);
2044         entry.query = tomoyo_init_log(r, len, fmt, args);
2045         va_end(args);
2046         if (!entry.query)
2047                 goto out;
2048         entry.query_len = strlen(entry.query) + 1;
2049         if (!error) {
2050                 tomoyo_add_entry(r->domain, entry.query);
2051                 goto out;
2052         }
2053         len = tomoyo_round2(entry.query_len);
2054         entry.domain = r->domain;
2055         spin_lock(&tomoyo_query_list_lock);
2056         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2057             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2058             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2059                 quota_exceeded = true;
2060         } else {
2061                 entry.serial = tomoyo_serial++;
2062                 entry.retry = r->retry;
2063                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2064                 list_add_tail(&entry.list, &tomoyo_query_list);
2065         }
2066         spin_unlock(&tomoyo_query_list_lock);
2067         if (quota_exceeded)
2068                 goto out;
2069         /* Give 10 seconds for supervisor's opinion. */
2070         while (entry.timer < 10) {
2071                 wake_up_all(&tomoyo_query_wait);
2072                 if (wait_event_interruptible_timeout
2073                     (tomoyo_answer_wait, entry.answer ||
2074                      !atomic_read(&tomoyo_query_observers), HZ))
2075                         break;
2076                 else
2077                         entry.timer++;
2078         }
2079         spin_lock(&tomoyo_query_list_lock);
2080         list_del(&entry.list);
2081         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2082         spin_unlock(&tomoyo_query_list_lock);
2083         switch (entry.answer) {
2084         case 3: /* Asked to retry by administrator. */
2085                 error = TOMOYO_RETRY_REQUEST;
2086                 r->retry++;
2087                 break;
2088         case 1:
2089                 /* Granted by administrator. */
2090                 error = 0;
2091                 break;
2092         default:
2093                 /* Timed out or rejected by administrator. */
2094                 break;
2095         }
2096 out:
2097         kfree(entry.query);
2098         return error;
2099 }
2100
2101 /**
2102  * tomoyo_find_domain_by_qid - Get domain by query id.
2103  *
2104  * @serial: Query ID assigned by tomoyo_supervisor().
2105  *
2106  * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2107  */
2108 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2109 (unsigned int serial)
2110 {
2111         struct tomoyo_query *ptr;
2112         struct tomoyo_domain_info *domain = NULL;
2113         spin_lock(&tomoyo_query_list_lock);
2114         list_for_each_entry(ptr, &tomoyo_query_list, list) {
2115                 if (ptr->serial != serial)
2116                         continue;
2117                 domain = ptr->domain;
2118                 break;
2119         }
2120         spin_unlock(&tomoyo_query_list_lock);
2121         return domain;
2122 }
2123
2124 /**
2125  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2126  *
2127  * @file: Pointer to "struct file".
2128  * @wait: Pointer to "poll_table".
2129  *
2130  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2131  *
2132  * Waits for access requests which violated policy in enforcing mode.
2133  */
2134 static unsigned int tomoyo_poll_query(struct file *file, poll_table *wait)
2135 {
2136         if (!list_empty(&tomoyo_query_list))
2137                 return POLLIN | POLLRDNORM;
2138         poll_wait(file, &tomoyo_query_wait, wait);
2139         if (!list_empty(&tomoyo_query_list))
2140                 return POLLIN | POLLRDNORM;
2141         return 0;
2142 }
2143
2144 /**
2145  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2146  *
2147  * @head: Pointer to "struct tomoyo_io_buffer".
2148  */
2149 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2150 {
2151         struct list_head *tmp;
2152         unsigned int pos = 0;
2153         size_t len = 0;
2154         char *buf;
2155         if (head->r.w_pos)
2156                 return;
2157         if (head->read_buf) {
2158                 kfree(head->read_buf);
2159                 head->read_buf = NULL;
2160         }
2161         spin_lock(&tomoyo_query_list_lock);
2162         list_for_each(tmp, &tomoyo_query_list) {
2163                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2164                 if (pos++ != head->r.query_index)
2165                         continue;
2166                 len = ptr->query_len;
2167                 break;
2168         }
2169         spin_unlock(&tomoyo_query_list_lock);
2170         if (!len) {
2171                 head->r.query_index = 0;
2172                 return;
2173         }
2174         buf = kzalloc(len + 32, GFP_NOFS);
2175         if (!buf)
2176                 return;
2177         pos = 0;
2178         spin_lock(&tomoyo_query_list_lock);
2179         list_for_each(tmp, &tomoyo_query_list) {
2180                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2181                 if (pos++ != head->r.query_index)
2182                         continue;
2183                 /*
2184                  * Some query can be skipped because tomoyo_query_list
2185                  * can change, but I don't care.
2186                  */
2187                 if (len == ptr->query_len)
2188                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2189                                  ptr->retry, ptr->query);
2190                 break;
2191         }
2192         spin_unlock(&tomoyo_query_list_lock);
2193         if (buf[0]) {
2194                 head->read_buf = buf;
2195                 head->r.w[head->r.w_pos++] = buf;
2196                 head->r.query_index++;
2197         } else {
2198                 kfree(buf);
2199         }
2200 }
2201
2202 /**
2203  * tomoyo_write_answer - Write the supervisor's decision.
2204  *
2205  * @head: Pointer to "struct tomoyo_io_buffer".
2206  *
2207  * Returns 0 on success, -EINVAL otherwise.
2208  */
2209 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2210 {
2211         char *data = head->write_buf;
2212         struct list_head *tmp;
2213         unsigned int serial;
2214         unsigned int answer;
2215         spin_lock(&tomoyo_query_list_lock);
2216         list_for_each(tmp, &tomoyo_query_list) {
2217                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2218                 ptr->timer = 0;
2219         }
2220         spin_unlock(&tomoyo_query_list_lock);
2221         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2222                 return -EINVAL;
2223         spin_lock(&tomoyo_query_list_lock);
2224         list_for_each(tmp, &tomoyo_query_list) {
2225                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2226                 if (ptr->serial != serial)
2227                         continue;
2228                 ptr->answer = answer;
2229                 /* Remove from tomoyo_query_list. */
2230                 if (ptr->answer)
2231                         list_del_init(&ptr->list);
2232                 break;
2233         }
2234         spin_unlock(&tomoyo_query_list_lock);
2235         return 0;
2236 }
2237
2238 /**
2239  * tomoyo_read_version: Get version.
2240  *
2241  * @head: Pointer to "struct tomoyo_io_buffer".
2242  *
2243  * Returns version information.
2244  */
2245 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2246 {
2247         if (!head->r.eof) {
2248                 tomoyo_io_printf(head, "2.5.0");
2249                 head->r.eof = true;
2250         }
2251 }
2252
2253 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2254 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2255         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2256         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2257         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2258         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2259 };
2260
2261 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2262 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2263         [TOMOYO_MEMORY_POLICY] = "policy:",
2264         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2265         [TOMOYO_MEMORY_QUERY]  = "query message:",
2266 };
2267
2268 /* Timestamp counter for last updated. */
2269 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2270 /* Counter for number of updates. */
2271 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2272
2273 /**
2274  * tomoyo_update_stat - Update statistic counters.
2275  *
2276  * @index: Index for policy type.
2277  *
2278  * Returns nothing.
2279  */
2280 void tomoyo_update_stat(const u8 index)
2281 {
2282         struct timeval tv;
2283         do_gettimeofday(&tv);
2284         /*
2285          * I don't use atomic operations because race condition is not fatal.
2286          */
2287         tomoyo_stat_updated[index]++;
2288         tomoyo_stat_modified[index] = tv.tv_sec;
2289 }
2290
2291 /**
2292  * tomoyo_read_stat - Read statistic data.
2293  *
2294  * @head: Pointer to "struct tomoyo_io_buffer".
2295  *
2296  * Returns nothing.
2297  */
2298 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2299 {
2300         u8 i;
2301         unsigned int total = 0;
2302         if (head->r.eof)
2303                 return;
2304         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2305                 tomoyo_io_printf(head, "Policy %-30s %10u",
2306                                  tomoyo_policy_headers[i],
2307                                  tomoyo_stat_updated[i]);
2308                 if (tomoyo_stat_modified[i]) {
2309                         struct tomoyo_time stamp;
2310                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2311                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2312                                          "%02u:%02u:%02u)",
2313                                          stamp.year, stamp.month, stamp.day,
2314                                          stamp.hour, stamp.min, stamp.sec);
2315                 }
2316                 tomoyo_set_lf(head);
2317         }
2318         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2319                 unsigned int used = tomoyo_memory_used[i];
2320                 total += used;
2321                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2322                                  tomoyo_memory_headers[i], used);
2323                 used = tomoyo_memory_quota[i];
2324                 if (used)
2325                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2326                 tomoyo_set_lf(head);
2327         }
2328         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2329                          total);
2330         head->r.eof = true;
2331 }
2332
2333 /**
2334  * tomoyo_write_stat - Set memory quota.
2335  *
2336  * @head: Pointer to "struct tomoyo_io_buffer".
2337  *
2338  * Returns 0.
2339  */
2340 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2341 {
2342         char *data = head->write_buf;
2343         u8 i;
2344         if (tomoyo_str_starts(&data, "Memory used by "))
2345                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2346                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2347                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2348         return 0;
2349 }
2350
2351 /**
2352  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2353  *
2354  * @type: Type of interface.
2355  * @file: Pointer to "struct file".
2356  *
2357  * Returns 0 on success, negative value otherwise.
2358  */
2359 int tomoyo_open_control(const u8 type, struct file *file)
2360 {
2361         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2362
2363         if (!head)
2364                 return -ENOMEM;
2365         mutex_init(&head->io_sem);
2366         head->type = type;
2367         switch (type) {
2368         case TOMOYO_DOMAINPOLICY:
2369                 /* /sys/kernel/security/tomoyo/domain_policy */
2370                 head->write = tomoyo_write_domain;
2371                 head->read = tomoyo_read_domain;
2372                 break;
2373         case TOMOYO_EXCEPTIONPOLICY:
2374                 /* /sys/kernel/security/tomoyo/exception_policy */
2375                 head->write = tomoyo_write_exception;
2376                 head->read = tomoyo_read_exception;
2377                 break;
2378         case TOMOYO_AUDIT:
2379                 /* /sys/kernel/security/tomoyo/audit */
2380                 head->poll = tomoyo_poll_log;
2381                 head->read = tomoyo_read_log;
2382                 break;
2383         case TOMOYO_PROCESS_STATUS:
2384                 /* /sys/kernel/security/tomoyo/.process_status */
2385                 head->write = tomoyo_write_pid;
2386                 head->read = tomoyo_read_pid;
2387                 break;
2388         case TOMOYO_VERSION:
2389                 /* /sys/kernel/security/tomoyo/version */
2390                 head->read = tomoyo_read_version;
2391                 head->readbuf_size = 128;
2392                 break;
2393         case TOMOYO_STAT:
2394                 /* /sys/kernel/security/tomoyo/stat */
2395                 head->write = tomoyo_write_stat;
2396                 head->read = tomoyo_read_stat;
2397                 head->readbuf_size = 1024;
2398                 break;
2399         case TOMOYO_PROFILE:
2400                 /* /sys/kernel/security/tomoyo/profile */
2401                 head->write = tomoyo_write_profile;
2402                 head->read = tomoyo_read_profile;
2403                 break;
2404         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2405                 head->poll = tomoyo_poll_query;
2406                 head->write = tomoyo_write_answer;
2407                 head->read = tomoyo_read_query;
2408                 break;
2409         case TOMOYO_MANAGER:
2410                 /* /sys/kernel/security/tomoyo/manager */
2411                 head->write = tomoyo_write_manager;
2412                 head->read = tomoyo_read_manager;
2413                 break;
2414         }
2415         if (!(file->f_mode & FMODE_READ)) {
2416                 /*
2417                  * No need to allocate read_buf since it is not opened
2418                  * for reading.
2419                  */
2420                 head->read = NULL;
2421                 head->poll = NULL;
2422         } else if (!head->poll) {
2423                 /* Don't allocate read_buf for poll() access. */
2424                 if (!head->readbuf_size)
2425                         head->readbuf_size = 4096 * 2;
2426                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2427                 if (!head->read_buf) {
2428                         kfree(head);
2429                         return -ENOMEM;
2430                 }
2431         }
2432         if (!(file->f_mode & FMODE_WRITE)) {
2433                 /*
2434                  * No need to allocate write_buf since it is not opened
2435                  * for writing.
2436                  */
2437                 head->write = NULL;
2438         } else if (head->write) {
2439                 head->writebuf_size = 4096 * 2;
2440                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2441                 if (!head->write_buf) {
2442                         kfree(head->read_buf);
2443                         kfree(head);
2444                         return -ENOMEM;
2445                 }
2446         }
2447         /*
2448          * If the file is /sys/kernel/security/tomoyo/query , increment the
2449          * observer counter.
2450          * The obserber counter is used by tomoyo_supervisor() to see if
2451          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2452          */
2453         if (type == TOMOYO_QUERY)
2454                 atomic_inc(&tomoyo_query_observers);
2455         file->private_data = head;
2456         tomoyo_notify_gc(head, true);
2457         return 0;
2458 }
2459
2460 /**
2461  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2462  *
2463  * @file: Pointer to "struct file".
2464  * @wait: Pointer to "poll_table". Maybe NULL.
2465  *
2466  * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write,
2467  * POLLOUT | POLLWRNORM otherwise.
2468  */
2469 unsigned int tomoyo_poll_control(struct file *file, poll_table *wait)
2470 {
2471         struct tomoyo_io_buffer *head = file->private_data;
2472         if (head->poll)
2473                 return head->poll(file, wait) | POLLOUT | POLLWRNORM;
2474         return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM;
2475 }
2476
2477 /**
2478  * tomoyo_set_namespace_cursor - Set namespace to read.
2479  *
2480  * @head: Pointer to "struct tomoyo_io_buffer".
2481  *
2482  * Returns nothing.
2483  */
2484 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2485 {
2486         struct list_head *ns;
2487         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2488             head->type != TOMOYO_PROFILE)
2489                 return;
2490         /*
2491          * If this is the first read, or reading previous namespace finished
2492          * and has more namespaces to read, update the namespace cursor.
2493          */
2494         ns = head->r.ns;
2495         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2496                 /* Clearing is OK because tomoyo_flush() returned true. */
2497                 memset(&head->r, 0, sizeof(head->r));
2498                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2499         }
2500 }
2501
2502 /**
2503  * tomoyo_has_more_namespace - Check for unread namespaces.
2504  *
2505  * @head: Pointer to "struct tomoyo_io_buffer".
2506  *
2507  * Returns true if we have more entries to print, false otherwise.
2508  */
2509 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2510 {
2511         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2512                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2513                 head->r.ns->next != &tomoyo_namespace_list;
2514 }
2515
2516 /**
2517  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2518  *
2519  * @head:       Pointer to "struct tomoyo_io_buffer".
2520  * @buffer:     Poiner to buffer to write to.
2521  * @buffer_len: Size of @buffer.
2522  *
2523  * Returns bytes read on success, negative value otherwise.
2524  */
2525 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2526                             const int buffer_len)
2527 {
2528         int len;
2529         int idx;
2530
2531         if (!head->read)
2532                 return -ENOSYS;
2533         if (mutex_lock_interruptible(&head->io_sem))
2534                 return -EINTR;
2535         head->read_user_buf = buffer;
2536         head->read_user_buf_avail = buffer_len;
2537         idx = tomoyo_read_lock();
2538         if (tomoyo_flush(head))
2539                 /* Call the policy handler. */
2540                 do {
2541                         tomoyo_set_namespace_cursor(head);
2542                         head->read(head);
2543                 } while (tomoyo_flush(head) &&
2544                          tomoyo_has_more_namespace(head));
2545         tomoyo_read_unlock(idx);
2546         len = head->read_user_buf - buffer;
2547         mutex_unlock(&head->io_sem);
2548         return len;
2549 }
2550
2551 /**
2552  * tomoyo_parse_policy - Parse a policy line.
2553  *
2554  * @head: Poiter to "struct tomoyo_io_buffer".
2555  * @line: Line to parse.
2556  *
2557  * Returns 0 on success, negative value otherwise.
2558  *
2559  * Caller holds tomoyo_read_lock().
2560  */
2561 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2562 {
2563         /* Delete request? */
2564         head->w.is_delete = !strncmp(line, "delete ", 7);
2565         if (head->w.is_delete)
2566                 memmove(line, line + 7, strlen(line + 7) + 1);
2567         /* Selecting namespace to update. */
2568         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2569             head->type == TOMOYO_PROFILE) {
2570                 if (*line == '<') {
2571                         char *cp = strchr(line, ' ');
2572                         if (cp) {
2573                                 *cp++ = '\0';
2574                                 head->w.ns = tomoyo_assign_namespace(line);
2575                                 memmove(line, cp, strlen(cp) + 1);
2576                         } else
2577                                 head->w.ns = NULL;
2578                 } else
2579                         head->w.ns = &tomoyo_kernel_namespace;
2580                 /* Don't allow updating if namespace is invalid. */
2581                 if (!head->w.ns)
2582                         return -ENOENT;
2583         }
2584         /* Do the update. */
2585         return head->write(head);
2586 }
2587
2588 /**
2589  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2590  *
2591  * @head:       Pointer to "struct tomoyo_io_buffer".
2592  * @buffer:     Pointer to buffer to read from.
2593  * @buffer_len: Size of @buffer.
2594  *
2595  * Returns @buffer_len on success, negative value otherwise.
2596  */
2597 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2598                              const char __user *buffer, const int buffer_len)
2599 {
2600         int error = buffer_len;
2601         size_t avail_len = buffer_len;
2602         char *cp0 = head->write_buf;
2603         int idx;
2604         if (!head->write)
2605                 return -ENOSYS;
2606         if (!access_ok(VERIFY_READ, buffer, buffer_len))
2607                 return -EFAULT;
2608         if (mutex_lock_interruptible(&head->io_sem))
2609                 return -EINTR;
2610         head->read_user_buf_avail = 0;
2611         idx = tomoyo_read_lock();
2612         /* Read a line and dispatch it to the policy handler. */
2613         while (avail_len > 0) {
2614                 char c;
2615                 if (head->w.avail >= head->writebuf_size - 1) {
2616                         const int len = head->writebuf_size * 2;
2617                         char *cp = kzalloc(len, GFP_NOFS);
2618                         if (!cp) {
2619                                 error = -ENOMEM;
2620                                 break;
2621                         }
2622                         memmove(cp, cp0, head->w.avail);
2623                         kfree(cp0);
2624                         head->write_buf = cp;
2625                         cp0 = cp;
2626                         head->writebuf_size = len;
2627                 }
2628                 if (get_user(c, buffer)) {
2629                         error = -EFAULT;
2630                         break;
2631                 }
2632                 buffer++;
2633                 avail_len--;
2634                 cp0[head->w.avail++] = c;
2635                 if (c != '\n')
2636                         continue;
2637                 cp0[head->w.avail - 1] = '\0';
2638                 head->w.avail = 0;
2639                 tomoyo_normalize_line(cp0);
2640                 if (!strcmp(cp0, "reset")) {
2641                         head->w.ns = &tomoyo_kernel_namespace;
2642                         head->w.domain = NULL;
2643                         memset(&head->r, 0, sizeof(head->r));
2644                         continue;
2645                 }
2646                 /* Don't allow updating policies by non manager programs. */
2647                 switch (head->type) {
2648                 case TOMOYO_PROCESS_STATUS:
2649                         /* This does not write anything. */
2650                         break;
2651                 case TOMOYO_DOMAINPOLICY:
2652                         if (tomoyo_select_domain(head, cp0))
2653                                 continue;
2654                         /* fall through */
2655                 case TOMOYO_EXCEPTIONPOLICY:
2656                         if (!strcmp(cp0, "select transition_only")) {
2657                                 head->r.print_transition_related_only = true;
2658                                 continue;
2659                         }
2660                         /* fall through */
2661                 default:
2662                         if (!tomoyo_manager()) {
2663                                 error = -EPERM;
2664                                 goto out;
2665                         }
2666                 }
2667                 switch (tomoyo_parse_policy(head, cp0)) {
2668                 case -EPERM:
2669                         error = -EPERM;
2670                         goto out;
2671                 case 0:
2672                         switch (head->type) {
2673                         case TOMOYO_DOMAINPOLICY:
2674                         case TOMOYO_EXCEPTIONPOLICY:
2675                         case TOMOYO_STAT:
2676                         case TOMOYO_PROFILE:
2677                         case TOMOYO_MANAGER:
2678                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2679                                 break;
2680                         default:
2681                                 break;
2682                         }
2683                         break;
2684                 }
2685         }
2686 out:
2687         tomoyo_read_unlock(idx);
2688         mutex_unlock(&head->io_sem);
2689         return error;
2690 }
2691
2692 /**
2693  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2694  *
2695  * @head: Pointer to "struct tomoyo_io_buffer".
2696  *
2697  * Returns 0.
2698  */
2699 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2700 {
2701         /*
2702          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2703          * observer counter.
2704          */
2705         if (head->type == TOMOYO_QUERY &&
2706             atomic_dec_and_test(&tomoyo_query_observers))
2707                 wake_up_all(&tomoyo_answer_wait);
2708         tomoyo_notify_gc(head, false);
2709         return 0;
2710 }
2711
2712 /**
2713  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2714  */
2715 void tomoyo_check_profile(void)
2716 {
2717         struct tomoyo_domain_info *domain;
2718         const int idx = tomoyo_read_lock();
2719         tomoyo_policy_loaded = true;
2720         printk(KERN_INFO "TOMOYO: 2.5.0\n");
2721         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2722                 const u8 profile = domain->profile;
2723                 const struct tomoyo_policy_namespace *ns = domain->ns;
2724                 if (ns->profile_version != 20110903)
2725                         printk(KERN_ERR
2726                                "Profile version %u is not supported.\n",
2727                                ns->profile_version);
2728                 else if (!ns->profile_ptr[profile])
2729                         printk(KERN_ERR
2730                                "Profile %u (used by '%s') is not defined.\n",
2731                                profile, domain->domainname->name);
2732                 else
2733                         continue;
2734                 printk(KERN_ERR
2735                        "Userland tools for TOMOYO 2.5 must be installed and "
2736                        "policy must be initialized.\n");
2737                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2738                        "for more information.\n");
2739                 panic("STOP!");
2740         }
2741         tomoyo_read_unlock(idx);
2742         printk(KERN_INFO "Mandatory Access Control activated.\n");
2743 }
2744
2745 /**
2746  * tomoyo_load_builtin_policy - Load built-in policy.
2747  *
2748  * Returns nothing.
2749  */
2750 void __init tomoyo_load_builtin_policy(void)
2751 {
2752         /*
2753          * This include file is manually created and contains built-in policy
2754          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2755          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2756          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2757          */
2758 #include "builtin-policy.h"
2759         u8 i;
2760         const int idx = tomoyo_read_lock();
2761         for (i = 0; i < 5; i++) {
2762                 struct tomoyo_io_buffer head = { };
2763                 char *start = "";
2764                 switch (i) {
2765                 case 0:
2766                         start = tomoyo_builtin_profile;
2767                         head.type = TOMOYO_PROFILE;
2768                         head.write = tomoyo_write_profile;
2769                         break;
2770                 case 1:
2771                         start = tomoyo_builtin_exception_policy;
2772                         head.type = TOMOYO_EXCEPTIONPOLICY;
2773                         head.write = tomoyo_write_exception;
2774                         break;
2775                 case 2:
2776                         start = tomoyo_builtin_domain_policy;
2777                         head.type = TOMOYO_DOMAINPOLICY;
2778                         head.write = tomoyo_write_domain;
2779                         break;
2780                 case 3:
2781                         start = tomoyo_builtin_manager;
2782                         head.type = TOMOYO_MANAGER;
2783                         head.write = tomoyo_write_manager;
2784                         break;
2785                 case 4:
2786                         start = tomoyo_builtin_stat;
2787                         head.type = TOMOYO_STAT;
2788                         head.write = tomoyo_write_stat;
2789                         break;
2790                 }
2791                 while (1) {
2792                         char *end = strchr(start, '\n');
2793                         if (!end)
2794                                 break;
2795                         *end = '\0';
2796                         tomoyo_normalize_line(start);
2797                         head.write_buf = start;
2798                         tomoyo_parse_policy(&head, start);
2799                         start = end + 1;
2800                 }
2801         }
2802         tomoyo_read_unlock(idx);
2803 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2804         tomoyo_check_profile();
2805 #endif
2806 }