d8561c30fbf2a07201050498d2b8b0d3bf39315f
[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.
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 0;
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                 domain = NULL;
1168                 if (is_delete)
1169                         tomoyo_delete_domain(data);
1170                 else if (is_select)
1171                         domain = tomoyo_find_domain(data);
1172                 else
1173                         domain = tomoyo_assign_domain(data, false);
1174                 head->w.domain = domain;
1175                 return 0;
1176         }
1177         if (!domain)
1178                 return -EINVAL;
1179         ns = domain->ns;
1180         if (sscanf(data, "use_profile %u", &profile) == 1
1181             && profile < TOMOYO_MAX_PROFILES) {
1182                 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1183                         domain->profile = (u8) profile;
1184                 return 0;
1185         }
1186         if (sscanf(data, "use_group %u\n", &profile) == 1
1187             && profile < TOMOYO_MAX_ACL_GROUPS) {
1188                 if (!is_delete)
1189                         domain->group = (u8) profile;
1190                 return 0;
1191         }
1192         for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1193                 const char *cp = tomoyo_dif[profile];
1194                 if (strncmp(data, cp, strlen(cp) - 1))
1195                         continue;
1196                 domain->flags[profile] = !is_delete;
1197                 return 0;
1198         }
1199         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1200                                     is_delete);
1201 }
1202
1203 /**
1204  * tomoyo_print_condition - Print condition part.
1205  *
1206  * @head: Pointer to "struct tomoyo_io_buffer".
1207  * @cond: Pointer to "struct tomoyo_condition".
1208  *
1209  * Returns true on success, false otherwise.
1210  */
1211 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1212                                    const struct tomoyo_condition *cond)
1213 {
1214         switch (head->r.cond_step) {
1215         case 0:
1216                 head->r.cond_index = 0;
1217                 head->r.cond_step++;
1218                 if (cond->transit) {
1219                         tomoyo_set_space(head);
1220                         tomoyo_set_string(head, cond->transit->name);
1221                 }
1222                 /* fall through */
1223         case 1:
1224                 {
1225                         const u16 condc = cond->condc;
1226                         const struct tomoyo_condition_element *condp =
1227                                 (typeof(condp)) (cond + 1);
1228                         const struct tomoyo_number_union *numbers_p =
1229                                 (typeof(numbers_p)) (condp + condc);
1230                         const struct tomoyo_name_union *names_p =
1231                                 (typeof(names_p))
1232                                 (numbers_p + cond->numbers_count);
1233                         const struct tomoyo_argv *argv =
1234                                 (typeof(argv)) (names_p + cond->names_count);
1235                         const struct tomoyo_envp *envp =
1236                                 (typeof(envp)) (argv + cond->argc);
1237                         u16 skip;
1238                         for (skip = 0; skip < head->r.cond_index; skip++) {
1239                                 const u8 left = condp->left;
1240                                 const u8 right = condp->right;
1241                                 condp++;
1242                                 switch (left) {
1243                                 case TOMOYO_ARGV_ENTRY:
1244                                         argv++;
1245                                         continue;
1246                                 case TOMOYO_ENVP_ENTRY:
1247                                         envp++;
1248                                         continue;
1249                                 case TOMOYO_NUMBER_UNION:
1250                                         numbers_p++;
1251                                         break;
1252                                 }
1253                                 switch (right) {
1254                                 case TOMOYO_NAME_UNION:
1255                                         names_p++;
1256                                         break;
1257                                 case TOMOYO_NUMBER_UNION:
1258                                         numbers_p++;
1259                                         break;
1260                                 }
1261                         }
1262                         while (head->r.cond_index < condc) {
1263                                 const u8 match = condp->equals;
1264                                 const u8 left = condp->left;
1265                                 const u8 right = condp->right;
1266                                 if (!tomoyo_flush(head))
1267                                         return false;
1268                                 condp++;
1269                                 head->r.cond_index++;
1270                                 tomoyo_set_space(head);
1271                                 switch (left) {
1272                                 case TOMOYO_ARGV_ENTRY:
1273                                         tomoyo_io_printf(head,
1274                                                          "exec.argv[%lu]%s=\"",
1275                                                          argv->index, argv->
1276                                                          is_not ? "!" : "");
1277                                         tomoyo_set_string(head,
1278                                                           argv->value->name);
1279                                         tomoyo_set_string(head, "\"");
1280                                         argv++;
1281                                         continue;
1282                                 case TOMOYO_ENVP_ENTRY:
1283                                         tomoyo_set_string(head,
1284                                                           "exec.envp[\"");
1285                                         tomoyo_set_string(head,
1286                                                           envp->name->name);
1287                                         tomoyo_io_printf(head, "\"]%s=", envp->
1288                                                          is_not ? "!" : "");
1289                                         if (envp->value) {
1290                                                 tomoyo_set_string(head, "\"");
1291                                                 tomoyo_set_string(head, envp->
1292                                                                   value->name);
1293                                                 tomoyo_set_string(head, "\"");
1294                                         } else {
1295                                                 tomoyo_set_string(head,
1296                                                                   "NULL");
1297                                         }
1298                                         envp++;
1299                                         continue;
1300                                 case TOMOYO_NUMBER_UNION:
1301                                         tomoyo_print_number_union_nospace
1302                                                 (head, numbers_p++);
1303                                         break;
1304                                 default:
1305                                         tomoyo_set_string(head,
1306                                                tomoyo_condition_keyword[left]);
1307                                         break;
1308                                 }
1309                                 tomoyo_set_string(head, match ? "=" : "!=");
1310                                 switch (right) {
1311                                 case TOMOYO_NAME_UNION:
1312                                         tomoyo_print_name_union_quoted
1313                                                 (head, names_p++);
1314                                         break;
1315                                 case TOMOYO_NUMBER_UNION:
1316                                         tomoyo_print_number_union_nospace
1317                                                 (head, numbers_p++);
1318                                         break;
1319                                 default:
1320                                         tomoyo_set_string(head,
1321                                           tomoyo_condition_keyword[right]);
1322                                         break;
1323                                 }
1324                         }
1325                 }
1326                 head->r.cond_step++;
1327                 /* fall through */
1328         case 2:
1329                 if (!tomoyo_flush(head))
1330                         break;
1331                 head->r.cond_step++;
1332                 /* fall through */
1333         case 3:
1334                 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1335                         tomoyo_io_printf(head, " grant_log=%s",
1336                                          tomoyo_yesno(cond->grant_log ==
1337                                                       TOMOYO_GRANTLOG_YES));
1338                 tomoyo_set_lf(head);
1339                 return true;
1340         }
1341         return false;
1342 }
1343
1344 /**
1345  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1346  *
1347  * @head:     Pointer to "struct tomoyo_io_buffer".
1348  * @category: Category name.
1349  *
1350  * Returns nothing.
1351  */
1352 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1353                              const char *category)
1354 {
1355         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1356                 tomoyo_print_namespace(head);
1357                 tomoyo_io_printf(head, "acl_group %u ",
1358                                  head->r.acl_group_index);
1359         }
1360         tomoyo_set_string(head, category);
1361 }
1362
1363 /**
1364  * tomoyo_print_entry - Print an ACL entry.
1365  *
1366  * @head: Pointer to "struct tomoyo_io_buffer".
1367  * @acl:  Pointer to an ACL entry.
1368  *
1369  * Returns true on success, false otherwise.
1370  */
1371 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1372                                struct tomoyo_acl_info *acl)
1373 {
1374         const u8 acl_type = acl->type;
1375         bool first = true;
1376         u8 bit;
1377
1378         if (head->r.print_cond_part)
1379                 goto print_cond_part;
1380         if (acl->is_deleted)
1381                 return true;
1382         if (!tomoyo_flush(head))
1383                 return false;
1384         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1385                 struct tomoyo_path_acl *ptr =
1386                         container_of(acl, typeof(*ptr), head);
1387                 const u16 perm = ptr->perm;
1388                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1389                         if (!(perm & (1 << bit)))
1390                                 continue;
1391                         if (head->r.print_transition_related_only &&
1392                             bit != TOMOYO_TYPE_EXECUTE)
1393                                 continue;
1394                         if (first) {
1395                                 tomoyo_set_group(head, "file ");
1396                                 first = false;
1397                         } else {
1398                                 tomoyo_set_slash(head);
1399                         }
1400                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1401                 }
1402                 if (first)
1403                         return true;
1404                 tomoyo_print_name_union(head, &ptr->name);
1405         } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1406                 struct tomoyo_task_acl *ptr =
1407                         container_of(acl, typeof(*ptr), head);
1408                 tomoyo_set_group(head, "task ");
1409                 tomoyo_set_string(head, "manual_domain_transition ");
1410                 tomoyo_set_string(head, ptr->domainname->name);
1411         } else if (head->r.print_transition_related_only) {
1412                 return true;
1413         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1414                 struct tomoyo_path2_acl *ptr =
1415                         container_of(acl, typeof(*ptr), head);
1416                 const u8 perm = ptr->perm;
1417                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1418                         if (!(perm & (1 << bit)))
1419                                 continue;
1420                         if (first) {
1421                                 tomoyo_set_group(head, "file ");
1422                                 first = false;
1423                         } else {
1424                                 tomoyo_set_slash(head);
1425                         }
1426                         tomoyo_set_string(head, tomoyo_mac_keywords
1427                                           [tomoyo_pp2mac[bit]]);
1428                 }
1429                 if (first)
1430                         return true;
1431                 tomoyo_print_name_union(head, &ptr->name1);
1432                 tomoyo_print_name_union(head, &ptr->name2);
1433         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1434                 struct tomoyo_path_number_acl *ptr =
1435                         container_of(acl, typeof(*ptr), head);
1436                 const u8 perm = ptr->perm;
1437                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1438                         if (!(perm & (1 << bit)))
1439                                 continue;
1440                         if (first) {
1441                                 tomoyo_set_group(head, "file ");
1442                                 first = false;
1443                         } else {
1444                                 tomoyo_set_slash(head);
1445                         }
1446                         tomoyo_set_string(head, tomoyo_mac_keywords
1447                                           [tomoyo_pn2mac[bit]]);
1448                 }
1449                 if (first)
1450                         return true;
1451                 tomoyo_print_name_union(head, &ptr->name);
1452                 tomoyo_print_number_union(head, &ptr->number);
1453         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1454                 struct tomoyo_mkdev_acl *ptr =
1455                         container_of(acl, typeof(*ptr), head);
1456                 const u8 perm = ptr->perm;
1457                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1458                         if (!(perm & (1 << bit)))
1459                                 continue;
1460                         if (first) {
1461                                 tomoyo_set_group(head, "file ");
1462                                 first = false;
1463                         } else {
1464                                 tomoyo_set_slash(head);
1465                         }
1466                         tomoyo_set_string(head, tomoyo_mac_keywords
1467                                           [tomoyo_pnnn2mac[bit]]);
1468                 }
1469                 if (first)
1470                         return true;
1471                 tomoyo_print_name_union(head, &ptr->name);
1472                 tomoyo_print_number_union(head, &ptr->mode);
1473                 tomoyo_print_number_union(head, &ptr->major);
1474                 tomoyo_print_number_union(head, &ptr->minor);
1475         } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1476                 struct tomoyo_inet_acl *ptr =
1477                         container_of(acl, typeof(*ptr), head);
1478                 const u8 perm = ptr->perm;
1479
1480                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1481                         if (!(perm & (1 << bit)))
1482                                 continue;
1483                         if (first) {
1484                                 tomoyo_set_group(head, "network inet ");
1485                                 tomoyo_set_string(head, tomoyo_proto_keyword
1486                                                   [ptr->protocol]);
1487                                 tomoyo_set_space(head);
1488                                 first = false;
1489                         } else {
1490                                 tomoyo_set_slash(head);
1491                         }
1492                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1493                 }
1494                 if (first)
1495                         return true;
1496                 tomoyo_set_space(head);
1497                 if (ptr->address.group) {
1498                         tomoyo_set_string(head, "@");
1499                         tomoyo_set_string(head, ptr->address.group->group_name
1500                                           ->name);
1501                 } else {
1502                         char buf[128];
1503                         tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1504                         tomoyo_io_printf(head, "%s", buf);
1505                 }
1506                 tomoyo_print_number_union(head, &ptr->port);
1507         } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1508                 struct tomoyo_unix_acl *ptr =
1509                         container_of(acl, typeof(*ptr), head);
1510                 const u8 perm = ptr->perm;
1511
1512                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1513                         if (!(perm & (1 << bit)))
1514                                 continue;
1515                         if (first) {
1516                                 tomoyo_set_group(head, "network unix ");
1517                                 tomoyo_set_string(head, tomoyo_proto_keyword
1518                                                   [ptr->protocol]);
1519                                 tomoyo_set_space(head);
1520                                 first = false;
1521                         } else {
1522                                 tomoyo_set_slash(head);
1523                         }
1524                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1525                 }
1526                 if (first)
1527                         return true;
1528                 tomoyo_print_name_union(head, &ptr->name);
1529         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1530                 struct tomoyo_mount_acl *ptr =
1531                         container_of(acl, typeof(*ptr), head);
1532                 tomoyo_set_group(head, "file mount");
1533                 tomoyo_print_name_union(head, &ptr->dev_name);
1534                 tomoyo_print_name_union(head, &ptr->dir_name);
1535                 tomoyo_print_name_union(head, &ptr->fs_type);
1536                 tomoyo_print_number_union(head, &ptr->flags);
1537         } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1538                 struct tomoyo_env_acl *ptr =
1539                         container_of(acl, typeof(*ptr), head);
1540
1541                 tomoyo_set_group(head, "misc env ");
1542                 tomoyo_set_string(head, ptr->env->name);
1543         }
1544         if (acl->cond) {
1545                 head->r.print_cond_part = true;
1546                 head->r.cond_step = 0;
1547                 if (!tomoyo_flush(head))
1548                         return false;
1549 print_cond_part:
1550                 if (!tomoyo_print_condition(head, acl->cond))
1551                         return false;
1552                 head->r.print_cond_part = false;
1553         } else {
1554                 tomoyo_set_lf(head);
1555         }
1556         return true;
1557 }
1558
1559 /**
1560  * tomoyo_read_domain2 - Read domain policy.
1561  *
1562  * @head: Pointer to "struct tomoyo_io_buffer".
1563  * @list: Pointer to "struct list_head".
1564  *
1565  * Caller holds tomoyo_read_lock().
1566  *
1567  * Returns true on success, false otherwise.
1568  */
1569 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1570                                 struct list_head *list)
1571 {
1572         list_for_each_cookie(head->r.acl, list) {
1573                 struct tomoyo_acl_info *ptr =
1574                         list_entry(head->r.acl, typeof(*ptr), list);
1575                 if (!tomoyo_print_entry(head, ptr))
1576                         return false;
1577         }
1578         head->r.acl = NULL;
1579         return true;
1580 }
1581
1582 /**
1583  * tomoyo_read_domain - Read domain policy.
1584  *
1585  * @head: Pointer to "struct tomoyo_io_buffer".
1586  *
1587  * Caller holds tomoyo_read_lock().
1588  */
1589 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1590 {
1591         if (head->r.eof)
1592                 return;
1593         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1594                 struct tomoyo_domain_info *domain =
1595                         list_entry(head->r.domain, typeof(*domain), list);
1596                 switch (head->r.step) {
1597                         u8 i;
1598                 case 0:
1599                         if (domain->is_deleted &&
1600                             !head->r.print_this_domain_only)
1601                                 continue;
1602                         /* Print domainname and flags. */
1603                         tomoyo_set_string(head, domain->domainname->name);
1604                         tomoyo_set_lf(head);
1605                         tomoyo_io_printf(head, "use_profile %u\n",
1606                                          domain->profile);
1607                         tomoyo_io_printf(head, "use_group %u\n",
1608                                          domain->group);
1609                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1610                                 if (domain->flags[i])
1611                                         tomoyo_set_string(head, tomoyo_dif[i]);
1612                         head->r.step++;
1613                         tomoyo_set_lf(head);
1614                         /* fall through */
1615                 case 1:
1616                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1617                                 return;
1618                         head->r.step++;
1619                         if (!tomoyo_set_lf(head))
1620                                 return;
1621                         /* fall through */
1622                 case 2:
1623                         head->r.step = 0;
1624                         if (head->r.print_this_domain_only)
1625                                 goto done;
1626                 }
1627         }
1628  done:
1629         head->r.eof = true;
1630 }
1631
1632 /**
1633  * tomoyo_write_pid: Specify PID to obtain domainname.
1634  *
1635  * @head: Pointer to "struct tomoyo_io_buffer".
1636  *
1637  * Returns 0.
1638  */
1639 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1640 {
1641         head->r.eof = false;
1642         return 0;
1643 }
1644
1645 /**
1646  * tomoyo_read_pid - Get domainname of the specified PID.
1647  *
1648  * @head: Pointer to "struct tomoyo_io_buffer".
1649  *
1650  * Returns the domainname which the specified PID is in on success,
1651  * empty string otherwise.
1652  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1653  * using read()/write() interface rather than sysctl() interface.
1654  */
1655 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1656 {
1657         char *buf = head->write_buf;
1658         bool global_pid = false;
1659         unsigned int pid;
1660         struct task_struct *p;
1661         struct tomoyo_domain_info *domain = NULL;
1662
1663         /* Accessing write_buf is safe because head->io_sem is held. */
1664         if (!buf) {
1665                 head->r.eof = true;
1666                 return; /* Do nothing if open(O_RDONLY). */
1667         }
1668         if (head->r.w_pos || head->r.eof)
1669                 return;
1670         head->r.eof = true;
1671         if (tomoyo_str_starts(&buf, "global-pid "))
1672                 global_pid = true;
1673         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1674         rcu_read_lock();
1675         if (global_pid)
1676                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1677         else
1678                 p = find_task_by_vpid(pid);
1679         if (p)
1680                 domain = tomoyo_real_domain(p);
1681         rcu_read_unlock();
1682         if (!domain)
1683                 return;
1684         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1685         tomoyo_set_string(head, domain->domainname->name);
1686 }
1687
1688 /* String table for domain transition control keywords. */
1689 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1690         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1691         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1692         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1693         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1694         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1695         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1696 };
1697
1698 /* String table for grouping keywords. */
1699 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1700         [TOMOYO_PATH_GROUP]    = "path_group ",
1701         [TOMOYO_NUMBER_GROUP]  = "number_group ",
1702         [TOMOYO_ADDRESS_GROUP] = "address_group ",
1703 };
1704
1705 /**
1706  * tomoyo_write_exception - Write exception policy.
1707  *
1708  * @head: Pointer to "struct tomoyo_io_buffer".
1709  *
1710  * Returns 0 on success, negative value otherwise.
1711  *
1712  * Caller holds tomoyo_read_lock().
1713  */
1714 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1715 {
1716         const bool is_delete = head->w.is_delete;
1717         struct tomoyo_acl_param param = {
1718                 .ns = head->w.ns,
1719                 .is_delete = is_delete,
1720                 .data = head->write_buf,
1721         };
1722         u8 i;
1723         if (tomoyo_str_starts(&param.data, "aggregator "))
1724                 return tomoyo_write_aggregator(&param);
1725         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1726                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1727                         return tomoyo_write_transition_control(&param, i);
1728         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1729                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1730                         return tomoyo_write_group(&param, i);
1731         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1732                 unsigned int group;
1733                 char *data;
1734                 group = simple_strtoul(param.data, &data, 10);
1735                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1736                         return tomoyo_write_domain2
1737                                 (head->w.ns, &head->w.ns->acl_group[group],
1738                                  data, is_delete);
1739         }
1740         return -EINVAL;
1741 }
1742
1743 /**
1744  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1745  *
1746  * @head: Pointer to "struct tomoyo_io_buffer".
1747  * @idx:  Index number.
1748  *
1749  * Returns true on success, false otherwise.
1750  *
1751  * Caller holds tomoyo_read_lock().
1752  */
1753 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1754 {
1755         struct tomoyo_policy_namespace *ns =
1756                 container_of(head->r.ns, typeof(*ns), namespace_list);
1757         struct list_head *list = &ns->group_list[idx];
1758         list_for_each_cookie(head->r.group, list) {
1759                 struct tomoyo_group *group =
1760                         list_entry(head->r.group, typeof(*group), head.list);
1761                 list_for_each_cookie(head->r.acl, &group->member_list) {
1762                         struct tomoyo_acl_head *ptr =
1763                                 list_entry(head->r.acl, typeof(*ptr), list);
1764                         if (ptr->is_deleted)
1765                                 continue;
1766                         if (!tomoyo_flush(head))
1767                                 return false;
1768                         tomoyo_print_namespace(head);
1769                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1770                         tomoyo_set_string(head, group->group_name->name);
1771                         if (idx == TOMOYO_PATH_GROUP) {
1772                                 tomoyo_set_space(head);
1773                                 tomoyo_set_string(head, container_of
1774                                                (ptr, struct tomoyo_path_group,
1775                                                 head)->member_name->name);
1776                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1777                                 tomoyo_print_number_union(head, &container_of
1778                                                           (ptr,
1779                                                    struct tomoyo_number_group,
1780                                                            head)->number);
1781                         } else if (idx == TOMOYO_ADDRESS_GROUP) {
1782                                 char buffer[128];
1783
1784                                 struct tomoyo_address_group *member =
1785                                         container_of(ptr, typeof(*member),
1786                                                      head);
1787                                 tomoyo_print_ip(buffer, sizeof(buffer),
1788                                                 &member->address);
1789                                 tomoyo_io_printf(head, " %s", buffer);
1790                         }
1791                         tomoyo_set_lf(head);
1792                 }
1793                 head->r.acl = NULL;
1794         }
1795         head->r.group = NULL;
1796         return true;
1797 }
1798
1799 /**
1800  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1801  *
1802  * @head: Pointer to "struct tomoyo_io_buffer".
1803  * @idx:  Index number.
1804  *
1805  * Returns true on success, false otherwise.
1806  *
1807  * Caller holds tomoyo_read_lock().
1808  */
1809 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1810 {
1811         struct tomoyo_policy_namespace *ns =
1812                 container_of(head->r.ns, typeof(*ns), namespace_list);
1813         struct list_head *list = &ns->policy_list[idx];
1814         list_for_each_cookie(head->r.acl, list) {
1815                 struct tomoyo_acl_head *acl =
1816                         container_of(head->r.acl, typeof(*acl), list);
1817                 if (acl->is_deleted)
1818                         continue;
1819                 if (!tomoyo_flush(head))
1820                         return false;
1821                 switch (idx) {
1822                 case TOMOYO_ID_TRANSITION_CONTROL:
1823                         {
1824                                 struct tomoyo_transition_control *ptr =
1825                                         container_of(acl, typeof(*ptr), head);
1826                                 tomoyo_print_namespace(head);
1827                                 tomoyo_set_string(head, tomoyo_transition_type
1828                                                   [ptr->type]);
1829                                 tomoyo_set_string(head, ptr->program ?
1830                                                   ptr->program->name : "any");
1831                                 tomoyo_set_string(head, " from ");
1832                                 tomoyo_set_string(head, ptr->domainname ?
1833                                                   ptr->domainname->name :
1834                                                   "any");
1835                         }
1836                         break;
1837                 case TOMOYO_ID_AGGREGATOR:
1838                         {
1839                                 struct tomoyo_aggregator *ptr =
1840                                         container_of(acl, typeof(*ptr), head);
1841                                 tomoyo_print_namespace(head);
1842                                 tomoyo_set_string(head, "aggregator ");
1843                                 tomoyo_set_string(head,
1844                                                   ptr->original_name->name);
1845                                 tomoyo_set_space(head);
1846                                 tomoyo_set_string(head,
1847                                                ptr->aggregated_name->name);
1848                         }
1849                         break;
1850                 default:
1851                         continue;
1852                 }
1853                 tomoyo_set_lf(head);
1854         }
1855         head->r.acl = NULL;
1856         return true;
1857 }
1858
1859 /**
1860  * tomoyo_read_exception - Read exception policy.
1861  *
1862  * @head: Pointer to "struct tomoyo_io_buffer".
1863  *
1864  * Caller holds tomoyo_read_lock().
1865  */
1866 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1867 {
1868         struct tomoyo_policy_namespace *ns =
1869                 container_of(head->r.ns, typeof(*ns), namespace_list);
1870         if (head->r.eof)
1871                 return;
1872         while (head->r.step < TOMOYO_MAX_POLICY &&
1873                tomoyo_read_policy(head, head->r.step))
1874                 head->r.step++;
1875         if (head->r.step < TOMOYO_MAX_POLICY)
1876                 return;
1877         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1878                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1879                 head->r.step++;
1880         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1881                 return;
1882         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1883                + TOMOYO_MAX_ACL_GROUPS) {
1884                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1885                         - TOMOYO_MAX_GROUP;
1886                 if (!tomoyo_read_domain2(head, &ns->acl_group
1887                                          [head->r.acl_group_index]))
1888                         return;
1889                 head->r.step++;
1890         }
1891         head->r.eof = true;
1892 }
1893
1894 /* Wait queue for kernel -> userspace notification. */
1895 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1896 /* Wait queue for userspace -> kernel notification. */
1897 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1898
1899 /* Structure for query. */
1900 struct tomoyo_query {
1901         struct list_head list;
1902         struct tomoyo_domain_info *domain;
1903         char *query;
1904         size_t query_len;
1905         unsigned int serial;
1906         u8 timer;
1907         u8 answer;
1908         u8 retry;
1909 };
1910
1911 /* The list for "struct tomoyo_query". */
1912 static LIST_HEAD(tomoyo_query_list);
1913
1914 /* Lock for manipulating tomoyo_query_list. */
1915 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1916
1917 /*
1918  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1919  * interface.
1920  */
1921 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1922
1923 /**
1924  * tomoyo_truncate - Truncate a line.
1925  *
1926  * @str: String to truncate.
1927  *
1928  * Returns length of truncated @str.
1929  */
1930 static int tomoyo_truncate(char *str)
1931 {
1932         char *start = str;
1933         while (*(unsigned char *) str > (unsigned char) ' ')
1934                 str++;
1935         *str = '\0';
1936         return strlen(start) + 1;
1937 }
1938
1939 /**
1940  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1941  *
1942  * @domain: Pointer to "struct tomoyo_domain_info".
1943  * @header: Lines containing ACL.
1944  *
1945  * Returns nothing.
1946  */
1947 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1948 {
1949         char *buffer;
1950         char *realpath = NULL;
1951         char *argv0 = NULL;
1952         char *symlink = NULL;
1953         char *cp = strchr(header, '\n');
1954         int len;
1955         if (!cp)
1956                 return;
1957         cp = strchr(cp + 1, '\n');
1958         if (!cp)
1959                 return;
1960         *cp++ = '\0';
1961         len = strlen(cp) + 1;
1962         /* strstr() will return NULL if ordering is wrong. */
1963         if (*cp == 'f') {
1964                 argv0 = strstr(header, " argv[]={ \"");
1965                 if (argv0) {
1966                         argv0 += 10;
1967                         len += tomoyo_truncate(argv0) + 14;
1968                 }
1969                 realpath = strstr(header, " exec={ realpath=\"");
1970                 if (realpath) {
1971                         realpath += 8;
1972                         len += tomoyo_truncate(realpath) + 6;
1973                 }
1974                 symlink = strstr(header, " symlink.target=\"");
1975                 if (symlink)
1976                         len += tomoyo_truncate(symlink + 1) + 1;
1977         }
1978         buffer = kmalloc(len, GFP_NOFS);
1979         if (!buffer)
1980                 return;
1981         snprintf(buffer, len - 1, "%s", cp);
1982         if (realpath)
1983                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1984         if (argv0)
1985                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1986         if (symlink)
1987                 tomoyo_addprintf(buffer, len, "%s", symlink);
1988         tomoyo_normalize_line(buffer);
1989         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1990                                   false))
1991                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1992         kfree(buffer);
1993 }
1994
1995 /**
1996  * tomoyo_supervisor - Ask for the supervisor's decision.
1997  *
1998  * @r:   Pointer to "struct tomoyo_request_info".
1999  * @fmt: The printf()'s format string, followed by parameters.
2000  *
2001  * Returns 0 if the supervisor decided to permit the access request which
2002  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2003  * supervisor decided to retry the access request which violated the policy in
2004  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2005  */
2006 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2007 {
2008         va_list args;
2009         int error;
2010         int len;
2011         static unsigned int tomoyo_serial;
2012         struct tomoyo_query entry = { };
2013         bool quota_exceeded = false;
2014         va_start(args, fmt);
2015         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2016         va_end(args);
2017         /* Write /sys/kernel/security/tomoyo/audit. */
2018         va_start(args, fmt);
2019         tomoyo_write_log2(r, len, fmt, args);
2020         va_end(args);
2021         /* Nothing more to do if granted. */
2022         if (r->granted)
2023                 return 0;
2024         if (r->mode)
2025                 tomoyo_update_stat(r->mode);
2026         switch (r->mode) {
2027         case TOMOYO_CONFIG_ENFORCING:
2028                 error = -EPERM;
2029                 if (atomic_read(&tomoyo_query_observers))
2030                         break;
2031                 goto out;
2032         case TOMOYO_CONFIG_LEARNING:
2033                 error = 0;
2034                 /* Check max_learning_entry parameter. */
2035                 if (tomoyo_domain_quota_is_ok(r))
2036                         break;
2037                 /* fall through */
2038         default:
2039                 return 0;
2040         }
2041         /* Get message. */
2042         va_start(args, fmt);
2043         entry.query = tomoyo_init_log(r, len, fmt, args);
2044         va_end(args);
2045         if (!entry.query)
2046                 goto out;
2047         entry.query_len = strlen(entry.query) + 1;
2048         if (!error) {
2049                 tomoyo_add_entry(r->domain, entry.query);
2050                 goto out;
2051         }
2052         len = tomoyo_round2(entry.query_len);
2053         entry.domain = r->domain;
2054         spin_lock(&tomoyo_query_list_lock);
2055         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2056             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2057             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2058                 quota_exceeded = true;
2059         } else {
2060                 entry.serial = tomoyo_serial++;
2061                 entry.retry = r->retry;
2062                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2063                 list_add_tail(&entry.list, &tomoyo_query_list);
2064         }
2065         spin_unlock(&tomoyo_query_list_lock);
2066         if (quota_exceeded)
2067                 goto out;
2068         /* Give 10 seconds for supervisor's opinion. */
2069         while (entry.timer < 10) {
2070                 wake_up_all(&tomoyo_query_wait);
2071                 if (wait_event_interruptible_timeout
2072                     (tomoyo_answer_wait, entry.answer ||
2073                      !atomic_read(&tomoyo_query_observers), HZ))
2074                         break;
2075                 else
2076                         entry.timer++;
2077         }
2078         spin_lock(&tomoyo_query_list_lock);
2079         list_del(&entry.list);
2080         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2081         spin_unlock(&tomoyo_query_list_lock);
2082         switch (entry.answer) {
2083         case 3: /* Asked to retry by administrator. */
2084                 error = TOMOYO_RETRY_REQUEST;
2085                 r->retry++;
2086                 break;
2087         case 1:
2088                 /* Granted by administrator. */
2089                 error = 0;
2090                 break;
2091         default:
2092                 /* Timed out or rejected by administrator. */
2093                 break;
2094         }
2095 out:
2096         kfree(entry.query);
2097         return error;
2098 }
2099
2100 /**
2101  * tomoyo_find_domain_by_qid - Get domain by query id.
2102  *
2103  * @serial: Query ID assigned by tomoyo_supervisor().
2104  *
2105  * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2106  */
2107 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2108 (unsigned int serial)
2109 {
2110         struct tomoyo_query *ptr;
2111         struct tomoyo_domain_info *domain = NULL;
2112         spin_lock(&tomoyo_query_list_lock);
2113         list_for_each_entry(ptr, &tomoyo_query_list, list) {
2114                 if (ptr->serial != serial)
2115                         continue;
2116                 domain = ptr->domain;
2117                 break;
2118         }
2119         spin_unlock(&tomoyo_query_list_lock);
2120         return domain;
2121 }
2122
2123 /**
2124  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2125  *
2126  * @file: Pointer to "struct file".
2127  * @wait: Pointer to "poll_table".
2128  *
2129  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2130  *
2131  * Waits for access requests which violated policy in enforcing mode.
2132  */
2133 static unsigned int tomoyo_poll_query(struct file *file, poll_table *wait)
2134 {
2135         if (!list_empty(&tomoyo_query_list))
2136                 return POLLIN | POLLRDNORM;
2137         poll_wait(file, &tomoyo_query_wait, wait);
2138         if (!list_empty(&tomoyo_query_list))
2139                 return POLLIN | POLLRDNORM;
2140         return 0;
2141 }
2142
2143 /**
2144  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2145  *
2146  * @head: Pointer to "struct tomoyo_io_buffer".
2147  */
2148 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2149 {
2150         struct list_head *tmp;
2151         unsigned int pos = 0;
2152         size_t len = 0;
2153         char *buf;
2154         if (head->r.w_pos)
2155                 return;
2156         if (head->read_buf) {
2157                 kfree(head->read_buf);
2158                 head->read_buf = NULL;
2159         }
2160         spin_lock(&tomoyo_query_list_lock);
2161         list_for_each(tmp, &tomoyo_query_list) {
2162                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2163                 if (pos++ != head->r.query_index)
2164                         continue;
2165                 len = ptr->query_len;
2166                 break;
2167         }
2168         spin_unlock(&tomoyo_query_list_lock);
2169         if (!len) {
2170                 head->r.query_index = 0;
2171                 return;
2172         }
2173         buf = kzalloc(len + 32, GFP_NOFS);
2174         if (!buf)
2175                 return;
2176         pos = 0;
2177         spin_lock(&tomoyo_query_list_lock);
2178         list_for_each(tmp, &tomoyo_query_list) {
2179                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2180                 if (pos++ != head->r.query_index)
2181                         continue;
2182                 /*
2183                  * Some query can be skipped because tomoyo_query_list
2184                  * can change, but I don't care.
2185                  */
2186                 if (len == ptr->query_len)
2187                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2188                                  ptr->retry, ptr->query);
2189                 break;
2190         }
2191         spin_unlock(&tomoyo_query_list_lock);
2192         if (buf[0]) {
2193                 head->read_buf = buf;
2194                 head->r.w[head->r.w_pos++] = buf;
2195                 head->r.query_index++;
2196         } else {
2197                 kfree(buf);
2198         }
2199 }
2200
2201 /**
2202  * tomoyo_write_answer - Write the supervisor's decision.
2203  *
2204  * @head: Pointer to "struct tomoyo_io_buffer".
2205  *
2206  * Returns 0 on success, -EINVAL otherwise.
2207  */
2208 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2209 {
2210         char *data = head->write_buf;
2211         struct list_head *tmp;
2212         unsigned int serial;
2213         unsigned int answer;
2214         spin_lock(&tomoyo_query_list_lock);
2215         list_for_each(tmp, &tomoyo_query_list) {
2216                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2217                 ptr->timer = 0;
2218         }
2219         spin_unlock(&tomoyo_query_list_lock);
2220         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2221                 return -EINVAL;
2222         spin_lock(&tomoyo_query_list_lock);
2223         list_for_each(tmp, &tomoyo_query_list) {
2224                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2225                 if (ptr->serial != serial)
2226                         continue;
2227                 ptr->answer = answer;
2228                 /* Remove from tomoyo_query_list. */
2229                 if (ptr->answer)
2230                         list_del_init(&ptr->list);
2231                 break;
2232         }
2233         spin_unlock(&tomoyo_query_list_lock);
2234         return 0;
2235 }
2236
2237 /**
2238  * tomoyo_read_version: Get version.
2239  *
2240  * @head: Pointer to "struct tomoyo_io_buffer".
2241  *
2242  * Returns version information.
2243  */
2244 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2245 {
2246         if (!head->r.eof) {
2247                 tomoyo_io_printf(head, "2.5.0");
2248                 head->r.eof = true;
2249         }
2250 }
2251
2252 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2253 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2254         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2255         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2256         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2257         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2258 };
2259
2260 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2261 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2262         [TOMOYO_MEMORY_POLICY] = "policy:",
2263         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2264         [TOMOYO_MEMORY_QUERY]  = "query message:",
2265 };
2266
2267 /* Timestamp counter for last updated. */
2268 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2269 /* Counter for number of updates. */
2270 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2271
2272 /**
2273  * tomoyo_update_stat - Update statistic counters.
2274  *
2275  * @index: Index for policy type.
2276  *
2277  * Returns nothing.
2278  */
2279 void tomoyo_update_stat(const u8 index)
2280 {
2281         struct timeval tv;
2282         do_gettimeofday(&tv);
2283         /*
2284          * I don't use atomic operations because race condition is not fatal.
2285          */
2286         tomoyo_stat_updated[index]++;
2287         tomoyo_stat_modified[index] = tv.tv_sec;
2288 }
2289
2290 /**
2291  * tomoyo_read_stat - Read statistic data.
2292  *
2293  * @head: Pointer to "struct tomoyo_io_buffer".
2294  *
2295  * Returns nothing.
2296  */
2297 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2298 {
2299         u8 i;
2300         unsigned int total = 0;
2301         if (head->r.eof)
2302                 return;
2303         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2304                 tomoyo_io_printf(head, "Policy %-30s %10u",
2305                                  tomoyo_policy_headers[i],
2306                                  tomoyo_stat_updated[i]);
2307                 if (tomoyo_stat_modified[i]) {
2308                         struct tomoyo_time stamp;
2309                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2310                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2311                                          "%02u:%02u:%02u)",
2312                                          stamp.year, stamp.month, stamp.day,
2313                                          stamp.hour, stamp.min, stamp.sec);
2314                 }
2315                 tomoyo_set_lf(head);
2316         }
2317         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2318                 unsigned int used = tomoyo_memory_used[i];
2319                 total += used;
2320                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2321                                  tomoyo_memory_headers[i], used);
2322                 used = tomoyo_memory_quota[i];
2323                 if (used)
2324                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2325                 tomoyo_set_lf(head);
2326         }
2327         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2328                          total);
2329         head->r.eof = true;
2330 }
2331
2332 /**
2333  * tomoyo_write_stat - Set memory quota.
2334  *
2335  * @head: Pointer to "struct tomoyo_io_buffer".
2336  *
2337  * Returns 0.
2338  */
2339 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2340 {
2341         char *data = head->write_buf;
2342         u8 i;
2343         if (tomoyo_str_starts(&data, "Memory used by "))
2344                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2345                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2346                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2347         return 0;
2348 }
2349
2350 /**
2351  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2352  *
2353  * @type: Type of interface.
2354  * @file: Pointer to "struct file".
2355  *
2356  * Returns 0 on success, negative value otherwise.
2357  */
2358 int tomoyo_open_control(const u8 type, struct file *file)
2359 {
2360         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2361
2362         if (!head)
2363                 return -ENOMEM;
2364         mutex_init(&head->io_sem);
2365         head->type = type;
2366         switch (type) {
2367         case TOMOYO_DOMAINPOLICY:
2368                 /* /sys/kernel/security/tomoyo/domain_policy */
2369                 head->write = tomoyo_write_domain;
2370                 head->read = tomoyo_read_domain;
2371                 break;
2372         case TOMOYO_EXCEPTIONPOLICY:
2373                 /* /sys/kernel/security/tomoyo/exception_policy */
2374                 head->write = tomoyo_write_exception;
2375                 head->read = tomoyo_read_exception;
2376                 break;
2377         case TOMOYO_AUDIT:
2378                 /* /sys/kernel/security/tomoyo/audit */
2379                 head->poll = tomoyo_poll_log;
2380                 head->read = tomoyo_read_log;
2381                 break;
2382         case TOMOYO_PROCESS_STATUS:
2383                 /* /sys/kernel/security/tomoyo/.process_status */
2384                 head->write = tomoyo_write_pid;
2385                 head->read = tomoyo_read_pid;
2386                 break;
2387         case TOMOYO_VERSION:
2388                 /* /sys/kernel/security/tomoyo/version */
2389                 head->read = tomoyo_read_version;
2390                 head->readbuf_size = 128;
2391                 break;
2392         case TOMOYO_STAT:
2393                 /* /sys/kernel/security/tomoyo/stat */
2394                 head->write = tomoyo_write_stat;
2395                 head->read = tomoyo_read_stat;
2396                 head->readbuf_size = 1024;
2397                 break;
2398         case TOMOYO_PROFILE:
2399                 /* /sys/kernel/security/tomoyo/profile */
2400                 head->write = tomoyo_write_profile;
2401                 head->read = tomoyo_read_profile;
2402                 break;
2403         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2404                 head->poll = tomoyo_poll_query;
2405                 head->write = tomoyo_write_answer;
2406                 head->read = tomoyo_read_query;
2407                 break;
2408         case TOMOYO_MANAGER:
2409                 /* /sys/kernel/security/tomoyo/manager */
2410                 head->write = tomoyo_write_manager;
2411                 head->read = tomoyo_read_manager;
2412                 break;
2413         }
2414         if (!(file->f_mode & FMODE_READ)) {
2415                 /*
2416                  * No need to allocate read_buf since it is not opened
2417                  * for reading.
2418                  */
2419                 head->read = NULL;
2420                 head->poll = NULL;
2421         } else if (!head->poll) {
2422                 /* Don't allocate read_buf for poll() access. */
2423                 if (!head->readbuf_size)
2424                         head->readbuf_size = 4096 * 2;
2425                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2426                 if (!head->read_buf) {
2427                         kfree(head);
2428                         return -ENOMEM;
2429                 }
2430         }
2431         if (!(file->f_mode & FMODE_WRITE)) {
2432                 /*
2433                  * No need to allocate write_buf since it is not opened
2434                  * for writing.
2435                  */
2436                 head->write = NULL;
2437         } else if (head->write) {
2438                 head->writebuf_size = 4096 * 2;
2439                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2440                 if (!head->write_buf) {
2441                         kfree(head->read_buf);
2442                         kfree(head);
2443                         return -ENOMEM;
2444                 }
2445         }
2446         /*
2447          * If the file is /sys/kernel/security/tomoyo/query , increment the
2448          * observer counter.
2449          * The obserber counter is used by tomoyo_supervisor() to see if
2450          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2451          */
2452         if (type == TOMOYO_QUERY)
2453                 atomic_inc(&tomoyo_query_observers);
2454         file->private_data = head;
2455         tomoyo_notify_gc(head, true);
2456         return 0;
2457 }
2458
2459 /**
2460  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2461  *
2462  * @file: Pointer to "struct file".
2463  * @wait: Pointer to "poll_table". Maybe NULL.
2464  *
2465  * Returns POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM if ready to read/write,
2466  * POLLOUT | POLLWRNORM otherwise.
2467  */
2468 unsigned int tomoyo_poll_control(struct file *file, poll_table *wait)
2469 {
2470         struct tomoyo_io_buffer *head = file->private_data;
2471         if (head->poll)
2472                 return head->poll(file, wait) | POLLOUT | POLLWRNORM;
2473         return POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM;
2474 }
2475
2476 /**
2477  * tomoyo_set_namespace_cursor - Set namespace to read.
2478  *
2479  * @head: Pointer to "struct tomoyo_io_buffer".
2480  *
2481  * Returns nothing.
2482  */
2483 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2484 {
2485         struct list_head *ns;
2486         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2487             head->type != TOMOYO_PROFILE)
2488                 return;
2489         /*
2490          * If this is the first read, or reading previous namespace finished
2491          * and has more namespaces to read, update the namespace cursor.
2492          */
2493         ns = head->r.ns;
2494         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2495                 /* Clearing is OK because tomoyo_flush() returned true. */
2496                 memset(&head->r, 0, sizeof(head->r));
2497                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2498         }
2499 }
2500
2501 /**
2502  * tomoyo_has_more_namespace - Check for unread namespaces.
2503  *
2504  * @head: Pointer to "struct tomoyo_io_buffer".
2505  *
2506  * Returns true if we have more entries to print, false otherwise.
2507  */
2508 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2509 {
2510         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2511                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2512                 head->r.ns->next != &tomoyo_namespace_list;
2513 }
2514
2515 /**
2516  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2517  *
2518  * @head:       Pointer to "struct tomoyo_io_buffer".
2519  * @buffer:     Poiner to buffer to write to.
2520  * @buffer_len: Size of @buffer.
2521  *
2522  * Returns bytes read on success, negative value otherwise.
2523  */
2524 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2525                             const int buffer_len)
2526 {
2527         int len;
2528         int idx;
2529
2530         if (!head->read)
2531                 return -ENOSYS;
2532         if (mutex_lock_interruptible(&head->io_sem))
2533                 return -EINTR;
2534         head->read_user_buf = buffer;
2535         head->read_user_buf_avail = buffer_len;
2536         idx = tomoyo_read_lock();
2537         if (tomoyo_flush(head))
2538                 /* Call the policy handler. */
2539                 do {
2540                         tomoyo_set_namespace_cursor(head);
2541                         head->read(head);
2542                 } while (tomoyo_flush(head) &&
2543                          tomoyo_has_more_namespace(head));
2544         tomoyo_read_unlock(idx);
2545         len = head->read_user_buf - buffer;
2546         mutex_unlock(&head->io_sem);
2547         return len;
2548 }
2549
2550 /**
2551  * tomoyo_parse_policy - Parse a policy line.
2552  *
2553  * @head: Poiter to "struct tomoyo_io_buffer".
2554  * @line: Line to parse.
2555  *
2556  * Returns 0 on success, negative value otherwise.
2557  *
2558  * Caller holds tomoyo_read_lock().
2559  */
2560 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2561 {
2562         /* Delete request? */
2563         head->w.is_delete = !strncmp(line, "delete ", 7);
2564         if (head->w.is_delete)
2565                 memmove(line, line + 7, strlen(line + 7) + 1);
2566         /* Selecting namespace to update. */
2567         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2568             head->type == TOMOYO_PROFILE) {
2569                 if (*line == '<') {
2570                         char *cp = strchr(line, ' ');
2571                         if (cp) {
2572                                 *cp++ = '\0';
2573                                 head->w.ns = tomoyo_assign_namespace(line);
2574                                 memmove(line, cp, strlen(cp) + 1);
2575                         } else
2576                                 head->w.ns = NULL;
2577                 } else
2578                         head->w.ns = &tomoyo_kernel_namespace;
2579                 /* Don't allow updating if namespace is invalid. */
2580                 if (!head->w.ns)
2581                         return -ENOENT;
2582         }
2583         /* Do the update. */
2584         return head->write(head);
2585 }
2586
2587 /**
2588  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2589  *
2590  * @head:       Pointer to "struct tomoyo_io_buffer".
2591  * @buffer:     Pointer to buffer to read from.
2592  * @buffer_len: Size of @buffer.
2593  *
2594  * Returns @buffer_len on success, negative value otherwise.
2595  */
2596 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2597                              const char __user *buffer, const int buffer_len)
2598 {
2599         int error = buffer_len;
2600         size_t avail_len = buffer_len;
2601         char *cp0 = head->write_buf;
2602         int idx;
2603         if (!head->write)
2604                 return -ENOSYS;
2605         if (!access_ok(VERIFY_READ, buffer, buffer_len))
2606                 return -EFAULT;
2607         if (mutex_lock_interruptible(&head->io_sem))
2608                 return -EINTR;
2609         head->read_user_buf_avail = 0;
2610         idx = tomoyo_read_lock();
2611         /* Read a line and dispatch it to the policy handler. */
2612         while (avail_len > 0) {
2613                 char c;
2614                 if (head->w.avail >= head->writebuf_size - 1) {
2615                         const int len = head->writebuf_size * 2;
2616                         char *cp = kzalloc(len, GFP_NOFS);
2617                         if (!cp) {
2618                                 error = -ENOMEM;
2619                                 break;
2620                         }
2621                         memmove(cp, cp0, head->w.avail);
2622                         kfree(cp0);
2623                         head->write_buf = cp;
2624                         cp0 = cp;
2625                         head->writebuf_size = len;
2626                 }
2627                 if (get_user(c, buffer)) {
2628                         error = -EFAULT;
2629                         break;
2630                 }
2631                 buffer++;
2632                 avail_len--;
2633                 cp0[head->w.avail++] = c;
2634                 if (c != '\n')
2635                         continue;
2636                 cp0[head->w.avail - 1] = '\0';
2637                 head->w.avail = 0;
2638                 tomoyo_normalize_line(cp0);
2639                 if (!strcmp(cp0, "reset")) {
2640                         head->w.ns = &tomoyo_kernel_namespace;
2641                         head->w.domain = NULL;
2642                         memset(&head->r, 0, sizeof(head->r));
2643                         continue;
2644                 }
2645                 /* Don't allow updating policies by non manager programs. */
2646                 switch (head->type) {
2647                 case TOMOYO_PROCESS_STATUS:
2648                         /* This does not write anything. */
2649                         break;
2650                 case TOMOYO_DOMAINPOLICY:
2651                         if (tomoyo_select_domain(head, cp0))
2652                                 continue;
2653                         /* fall through */
2654                 case TOMOYO_EXCEPTIONPOLICY:
2655                         if (!strcmp(cp0, "select transition_only")) {
2656                                 head->r.print_transition_related_only = true;
2657                                 continue;
2658                         }
2659                         /* fall through */
2660                 default:
2661                         if (!tomoyo_manager()) {
2662                                 error = -EPERM;
2663                                 goto out;
2664                         }
2665                 }
2666                 switch (tomoyo_parse_policy(head, cp0)) {
2667                 case -EPERM:
2668                         error = -EPERM;
2669                         goto out;
2670                 case 0:
2671                         switch (head->type) {
2672                         case TOMOYO_DOMAINPOLICY:
2673                         case TOMOYO_EXCEPTIONPOLICY:
2674                         case TOMOYO_STAT:
2675                         case TOMOYO_PROFILE:
2676                         case TOMOYO_MANAGER:
2677                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2678                                 break;
2679                         default:
2680                                 break;
2681                         }
2682                         break;
2683                 }
2684         }
2685 out:
2686         tomoyo_read_unlock(idx);
2687         mutex_unlock(&head->io_sem);
2688         return error;
2689 }
2690
2691 /**
2692  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2693  *
2694  * @head: Pointer to "struct tomoyo_io_buffer".
2695  *
2696  * Returns 0.
2697  */
2698 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2699 {
2700         /*
2701          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2702          * observer counter.
2703          */
2704         if (head->type == TOMOYO_QUERY &&
2705             atomic_dec_and_test(&tomoyo_query_observers))
2706                 wake_up_all(&tomoyo_answer_wait);
2707         tomoyo_notify_gc(head, false);
2708         return 0;
2709 }
2710
2711 /**
2712  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2713  */
2714 void tomoyo_check_profile(void)
2715 {
2716         struct tomoyo_domain_info *domain;
2717         const int idx = tomoyo_read_lock();
2718         tomoyo_policy_loaded = true;
2719         printk(KERN_INFO "TOMOYO: 2.5.0\n");
2720         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2721                 const u8 profile = domain->profile;
2722                 const struct tomoyo_policy_namespace *ns = domain->ns;
2723                 if (ns->profile_version != 20110903)
2724                         printk(KERN_ERR
2725                                "Profile version %u is not supported.\n",
2726                                ns->profile_version);
2727                 else if (!ns->profile_ptr[profile])
2728                         printk(KERN_ERR
2729                                "Profile %u (used by '%s') is not defined.\n",
2730                                profile, domain->domainname->name);
2731                 else
2732                         continue;
2733                 printk(KERN_ERR
2734                        "Userland tools for TOMOYO 2.5 must be installed and "
2735                        "policy must be initialized.\n");
2736                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.5/ "
2737                        "for more information.\n");
2738                 panic("STOP!");
2739         }
2740         tomoyo_read_unlock(idx);
2741         printk(KERN_INFO "Mandatory Access Control activated.\n");
2742 }
2743
2744 /**
2745  * tomoyo_load_builtin_policy - Load built-in policy.
2746  *
2747  * Returns nothing.
2748  */
2749 void __init tomoyo_load_builtin_policy(void)
2750 {
2751         /*
2752          * This include file is manually created and contains built-in policy
2753          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2754          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2755          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2756          */
2757 #include "builtin-policy.h"
2758         u8 i;
2759         const int idx = tomoyo_read_lock();
2760         for (i = 0; i < 5; i++) {
2761                 struct tomoyo_io_buffer head = { };
2762                 char *start = "";
2763                 switch (i) {
2764                 case 0:
2765                         start = tomoyo_builtin_profile;
2766                         head.type = TOMOYO_PROFILE;
2767                         head.write = tomoyo_write_profile;
2768                         break;
2769                 case 1:
2770                         start = tomoyo_builtin_exception_policy;
2771                         head.type = TOMOYO_EXCEPTIONPOLICY;
2772                         head.write = tomoyo_write_exception;
2773                         break;
2774                 case 2:
2775                         start = tomoyo_builtin_domain_policy;
2776                         head.type = TOMOYO_DOMAINPOLICY;
2777                         head.write = tomoyo_write_domain;
2778                         break;
2779                 case 3:
2780                         start = tomoyo_builtin_manager;
2781                         head.type = TOMOYO_MANAGER;
2782                         head.write = tomoyo_write_manager;
2783                         break;
2784                 case 4:
2785                         start = tomoyo_builtin_stat;
2786                         head.type = TOMOYO_STAT;
2787                         head.write = tomoyo_write_stat;
2788                         break;
2789                 }
2790                 while (1) {
2791                         char *end = strchr(start, '\n');
2792                         if (!end)
2793                                 break;
2794                         *end = '\0';
2795                         tomoyo_normalize_line(start);
2796                         head.write_buf = start;
2797                         tomoyo_parse_policy(&head, start);
2798                         start = end + 1;
2799                 }
2800         }
2801         tomoyo_read_unlock(idx);
2802 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2803         tomoyo_check_profile();
2804 #endif
2805 }