1fd0fc1059bafcf6ca60fdc95ace15759e69e730
[linux-2.6.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 /**
266  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
267  *
268  * @head: Pointer to "struct tomoyo_io_buffer".
269  * @fmt:  The printf()'s format string, followed by parameters.
270  */
271 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
272 {
273         va_list args;
274         size_t len;
275         size_t pos = head->r.avail;
276         int size = head->readbuf_size - pos;
277         if (size <= 0)
278                 return;
279         va_start(args, fmt);
280         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
281         va_end(args);
282         if (pos + len >= head->readbuf_size) {
283                 WARN_ON(1);
284                 return;
285         }
286         head->r.avail += len;
287         tomoyo_set_string(head, head->read_buf + pos);
288 }
289
290 /**
291  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
292  *
293  * @head: Pointer to "struct tomoyo_io_buffer".
294  *
295  * Returns nothing.
296  */
297 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
298 {
299         tomoyo_set_string(head, " ");
300 }
301
302 /**
303  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
304  *
305  * @head: Pointer to "struct tomoyo_io_buffer".
306  *
307  * Returns nothing.
308  */
309 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
310 {
311         tomoyo_set_string(head, "\n");
312         return !head->r.w_pos;
313 }
314
315 /**
316  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
317  *
318  * @head: Pointer to "struct tomoyo_io_buffer".
319  *
320  * Returns nothing.
321  */
322 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
323 {
324         tomoyo_set_string(head, "/");
325 }
326
327 /* List of namespaces. */
328 LIST_HEAD(tomoyo_namespace_list);
329 /* True if namespace other than tomoyo_kernel_namespace is defined. */
330 static bool tomoyo_namespace_enabled;
331
332 /**
333  * tomoyo_init_policy_namespace - Initialize namespace.
334  *
335  * @ns: Pointer to "struct tomoyo_policy_namespace".
336  *
337  * Returns nothing.
338  */
339 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
340 {
341         unsigned int idx;
342         for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
343                 INIT_LIST_HEAD(&ns->acl_group[idx]);
344         for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
345                 INIT_LIST_HEAD(&ns->group_list[idx]);
346         for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
347                 INIT_LIST_HEAD(&ns->policy_list[idx]);
348         ns->profile_version = 20100903;
349         tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
350         list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
351 }
352
353 /**
354  * tomoyo_print_namespace - Print namespace header.
355  *
356  * @head: Pointer to "struct tomoyo_io_buffer".
357  *
358  * Returns nothing.
359  */
360 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
361 {
362         if (!tomoyo_namespace_enabled)
363                 return;
364         tomoyo_set_string(head,
365                           container_of(head->r.ns,
366                                        struct tomoyo_policy_namespace,
367                                        namespace_list)->name);
368         tomoyo_set_space(head);
369 }
370
371 /**
372  * tomoyo_print_name_union - Print a tomoyo_name_union.
373  *
374  * @head: Pointer to "struct tomoyo_io_buffer".
375  * @ptr:  Pointer to "struct tomoyo_name_union".
376  */
377 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
378                                     const struct tomoyo_name_union *ptr)
379 {
380         tomoyo_set_space(head);
381         if (ptr->group) {
382                 tomoyo_set_string(head, "@");
383                 tomoyo_set_string(head, ptr->group->group_name->name);
384         } else {
385                 tomoyo_set_string(head, ptr->filename->name);
386         }
387 }
388
389 /**
390  * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
391  *
392  * @head: Pointer to "struct tomoyo_io_buffer".
393  * @ptr:  Pointer to "struct tomoyo_name_union".
394  *
395  * Returns nothing.
396  */
397 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
398                                            const struct tomoyo_name_union *ptr)
399 {
400         if (ptr->group) {
401                 tomoyo_set_string(head, "@");
402                 tomoyo_set_string(head, ptr->group->group_name->name);
403         } else {
404                 tomoyo_set_string(head, "\"");
405                 tomoyo_set_string(head, ptr->filename->name);
406                 tomoyo_set_string(head, "\"");
407         }
408 }
409
410 /**
411  * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
412  *
413  * @head: Pointer to "struct tomoyo_io_buffer".
414  * @ptr:  Pointer to "struct tomoyo_number_union".
415  *
416  * Returns nothing.
417  */
418 static void tomoyo_print_number_union_nospace
419 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
420 {
421         if (ptr->group) {
422                 tomoyo_set_string(head, "@");
423                 tomoyo_set_string(head, ptr->group->group_name->name);
424         } else {
425                 int i;
426                 unsigned long min = ptr->values[0];
427                 const unsigned long max = ptr->values[1];
428                 u8 min_type = ptr->value_type[0];
429                 const u8 max_type = ptr->value_type[1];
430                 char buffer[128];
431                 buffer[0] = '\0';
432                 for (i = 0; i < 2; i++) {
433                         switch (min_type) {
434                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
435                                 tomoyo_addprintf(buffer, sizeof(buffer),
436                                                  "0x%lX", min);
437                                 break;
438                         case TOMOYO_VALUE_TYPE_OCTAL:
439                                 tomoyo_addprintf(buffer, sizeof(buffer),
440                                                  "0%lo", min);
441                                 break;
442                         default:
443                                 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
444                                                  min);
445                                 break;
446                         }
447                         if (min == max && min_type == max_type)
448                                 break;
449                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
450                         min_type = max_type;
451                         min = max;
452                 }
453                 tomoyo_io_printf(head, "%s", buffer);
454         }
455 }
456
457 /**
458  * tomoyo_print_number_union - Print a tomoyo_number_union.
459  *
460  * @head: Pointer to "struct tomoyo_io_buffer".
461  * @ptr:  Pointer to "struct tomoyo_number_union".
462  *
463  * Returns nothing.
464  */
465 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
466                                       const struct tomoyo_number_union *ptr)
467 {
468         tomoyo_set_space(head);
469         tomoyo_print_number_union_nospace(head, ptr);
470 }
471
472 /**
473  * tomoyo_assign_profile - Create a new profile.
474  *
475  * @ns:      Pointer to "struct tomoyo_policy_namespace".
476  * @profile: Profile number to create.
477  *
478  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
479  */
480 static struct tomoyo_profile *tomoyo_assign_profile
481 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
482 {
483         struct tomoyo_profile *ptr;
484         struct tomoyo_profile *entry;
485         if (profile >= TOMOYO_MAX_PROFILES)
486                 return NULL;
487         ptr = ns->profile_ptr[profile];
488         if (ptr)
489                 return ptr;
490         entry = kzalloc(sizeof(*entry), GFP_NOFS);
491         if (mutex_lock_interruptible(&tomoyo_policy_lock))
492                 goto out;
493         ptr = ns->profile_ptr[profile];
494         if (!ptr && tomoyo_memory_ok(entry)) {
495                 ptr = entry;
496                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
497                         TOMOYO_CONFIG_WANT_GRANT_LOG |
498                         TOMOYO_CONFIG_WANT_REJECT_LOG;
499                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
500                        sizeof(ptr->config));
501                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 1024;
502                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 2048;
503                 mb(); /* Avoid out-of-order execution. */
504                 ns->profile_ptr[profile] = ptr;
505                 entry = NULL;
506         }
507         mutex_unlock(&tomoyo_policy_lock);
508  out:
509         kfree(entry);
510         return ptr;
511 }
512
513 /**
514  * tomoyo_profile - Find a profile.
515  *
516  * @ns:      Pointer to "struct tomoyo_policy_namespace".
517  * @profile: Profile number to find.
518  *
519  * Returns pointer to "struct tomoyo_profile".
520  */
521 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
522                                       const u8 profile)
523 {
524         static struct tomoyo_profile tomoyo_null_profile;
525         struct tomoyo_profile *ptr = ns->profile_ptr[profile];
526         if (!ptr)
527                 ptr = &tomoyo_null_profile;
528         return ptr;
529 }
530
531 /**
532  * tomoyo_find_yesno - Find values for specified keyword.
533  *
534  * @string: String to check.
535  * @find:   Name of keyword.
536  *
537  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
538  */
539 static s8 tomoyo_find_yesno(const char *string, const char *find)
540 {
541         const char *cp = strstr(string, find);
542         if (cp) {
543                 cp += strlen(find);
544                 if (!strncmp(cp, "=yes", 4))
545                         return 1;
546                 else if (!strncmp(cp, "=no", 3))
547                         return 0;
548         }
549         return -1;
550 }
551
552 /**
553  * tomoyo_set_uint - Set value for specified preference.
554  *
555  * @i:      Pointer to "unsigned int".
556  * @string: String to check.
557  * @find:   Name of keyword.
558  *
559  * Returns nothing.
560  */
561 static void tomoyo_set_uint(unsigned int *i, const char *string,
562                             const char *find)
563 {
564         const char *cp = strstr(string, find);
565         if (cp)
566                 sscanf(cp + strlen(find), "=%u", i);
567 }
568
569 /**
570  * tomoyo_set_mode - Set mode for specified profile.
571  *
572  * @name:    Name of functionality.
573  * @value:   Mode for @name.
574  * @profile: Pointer to "struct tomoyo_profile".
575  *
576  * Returns 0 on success, negative value otherwise.
577  */
578 static int tomoyo_set_mode(char *name, const char *value,
579                            struct tomoyo_profile *profile)
580 {
581         u8 i;
582         u8 config;
583         if (!strcmp(name, "CONFIG")) {
584                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
585                 config = profile->default_config;
586         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
587                 config = 0;
588                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
589                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
590                         int len = 0;
591                         if (i < TOMOYO_MAX_MAC_INDEX) {
592                                 const u8 c = tomoyo_index2category[i];
593                                 const char *category =
594                                         tomoyo_category_keywords[c];
595                                 len = strlen(category);
596                                 if (strncmp(name, category, len) ||
597                                     name[len++] != ':' || name[len++] != ':')
598                                         continue;
599                         }
600                         if (strcmp(name + len, tomoyo_mac_keywords[i]))
601                                 continue;
602                         config = profile->config[i];
603                         break;
604                 }
605                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
606                         return -EINVAL;
607         } else {
608                 return -EINVAL;
609         }
610         if (strstr(value, "use_default")) {
611                 config = TOMOYO_CONFIG_USE_DEFAULT;
612         } else {
613                 u8 mode;
614                 for (mode = 0; mode < 4; mode++)
615                         if (strstr(value, tomoyo_mode[mode]))
616                                 /*
617                                  * Update lower 3 bits in order to distinguish
618                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
619                                  */
620                                 config = (config & ~7) | mode;
621                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
622                         switch (tomoyo_find_yesno(value, "grant_log")) {
623                         case 1:
624                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
625                                 break;
626                         case 0:
627                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
628                                 break;
629                         }
630                         switch (tomoyo_find_yesno(value, "reject_log")) {
631                         case 1:
632                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
633                                 break;
634                         case 0:
635                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
636                                 break;
637                         }
638                 }
639         }
640         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
641                 profile->config[i] = config;
642         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
643                 profile->default_config = config;
644         return 0;
645 }
646
647 /**
648  * tomoyo_write_profile - Write profile table.
649  *
650  * @head: Pointer to "struct tomoyo_io_buffer".
651  *
652  * Returns 0 on success, negative value otherwise.
653  */
654 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
655 {
656         char *data = head->write_buf;
657         unsigned int i;
658         char *cp;
659         struct tomoyo_profile *profile;
660         if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
661             == 1)
662                 return 0;
663         i = simple_strtoul(data, &cp, 10);
664         if (*cp != '-')
665                 return -EINVAL;
666         data = cp + 1;
667         profile = tomoyo_assign_profile(head->w.ns, i);
668         if (!profile)
669                 return -EINVAL;
670         cp = strchr(data, '=');
671         if (!cp)
672                 return -EINVAL;
673         *cp++ = '\0';
674         if (!strcmp(data, "COMMENT")) {
675                 static DEFINE_SPINLOCK(lock);
676                 const struct tomoyo_path_info *new_comment
677                         = tomoyo_get_name(cp);
678                 const struct tomoyo_path_info *old_comment;
679                 if (!new_comment)
680                         return -ENOMEM;
681                 spin_lock(&lock);
682                 old_comment = profile->comment;
683                 profile->comment = new_comment;
684                 spin_unlock(&lock);
685                 tomoyo_put_name(old_comment);
686                 return 0;
687         }
688         if (!strcmp(data, "PREFERENCE")) {
689                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
690                         tomoyo_set_uint(&profile->pref[i], cp,
691                                         tomoyo_pref_keywords[i]);
692                 return 0;
693         }
694         return tomoyo_set_mode(data, cp, profile);
695 }
696
697 /**
698  * tomoyo_print_config - Print mode for specified functionality.
699  *
700  * @head:   Pointer to "struct tomoyo_io_buffer".
701  * @config: Mode for that functionality.
702  *
703  * Returns nothing.
704  *
705  * Caller prints functionality's name.
706  */
707 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
708 {
709         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
710                          tomoyo_mode[config & 3],
711                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
712                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
713 }
714
715 /**
716  * tomoyo_read_profile - Read profile table.
717  *
718  * @head: Pointer to "struct tomoyo_io_buffer".
719  *
720  * Returns nothing.
721  */
722 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
723 {
724         u8 index;
725         struct tomoyo_policy_namespace *ns =
726                 container_of(head->r.ns, typeof(*ns), namespace_list);
727         const struct tomoyo_profile *profile;
728         if (head->r.eof)
729                 return;
730  next:
731         index = head->r.index;
732         profile = ns->profile_ptr[index];
733         switch (head->r.step) {
734         case 0:
735                 tomoyo_print_namespace(head);
736                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
737                                  ns->profile_version);
738                 head->r.step++;
739                 break;
740         case 1:
741                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
742                       head->r.index++)
743                         if (ns->profile_ptr[head->r.index])
744                                 break;
745                 if (head->r.index == TOMOYO_MAX_PROFILES)
746                         return;
747                 head->r.step++;
748                 break;
749         case 2:
750                 {
751                         u8 i;
752                         const struct tomoyo_path_info *comment =
753                                 profile->comment;
754                         tomoyo_print_namespace(head);
755                         tomoyo_io_printf(head, "%u-COMMENT=", index);
756                         tomoyo_set_string(head, comment ? comment->name : "");
757                         tomoyo_set_lf(head);
758                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
759                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
760                                 tomoyo_io_printf(head, "%s=%u ",
761                                                  tomoyo_pref_keywords[i],
762                                                  profile->pref[i]);
763                         tomoyo_set_string(head, "}\n");
764                         head->r.step++;
765                 }
766                 break;
767         case 3:
768                 {
769                         tomoyo_print_namespace(head);
770                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
771                         tomoyo_print_config(head, profile->default_config);
772                         head->r.bit = 0;
773                         head->r.step++;
774                 }
775                 break;
776         case 4:
777                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
778                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
779                         const u8 i = head->r.bit;
780                         const u8 config = profile->config[i];
781                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
782                                 continue;
783                         tomoyo_print_namespace(head);
784                         if (i < TOMOYO_MAX_MAC_INDEX)
785                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
786                                                  index,
787                                                  tomoyo_category_keywords
788                                                  [tomoyo_index2category[i]],
789                                                  tomoyo_mac_keywords[i]);
790                         else
791                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
792                                                  tomoyo_mac_keywords[i]);
793                         tomoyo_print_config(head, config);
794                         head->r.bit++;
795                         break;
796                 }
797                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
798                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
799                         head->r.index++;
800                         head->r.step = 1;
801                 }
802                 break;
803         }
804         if (tomoyo_flush(head))
805                 goto next;
806 }
807
808 /**
809  * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
810  *
811  * @a: Pointer to "struct tomoyo_acl_head".
812  * @b: Pointer to "struct tomoyo_acl_head".
813  *
814  * Returns true if @a == @b, false otherwise.
815  */
816 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
817                                 const struct tomoyo_acl_head *b)
818 {
819         return container_of(a, struct tomoyo_manager, head)->manager ==
820                 container_of(b, struct tomoyo_manager, head)->manager;
821 }
822
823 /**
824  * tomoyo_update_manager_entry - Add a manager entry.
825  *
826  * @manager:   The path to manager or the domainnamme.
827  * @is_delete: True if it is a delete request.
828  *
829  * Returns 0 on success, negative value otherwise.
830  *
831  * Caller holds tomoyo_read_lock().
832  */
833 static int tomoyo_update_manager_entry(const char *manager,
834                                        const bool is_delete)
835 {
836         struct tomoyo_manager e = { };
837         struct tomoyo_acl_param param = {
838                 /* .ns = &tomoyo_kernel_namespace, */
839                 .is_delete = is_delete,
840                 .list = &tomoyo_kernel_namespace.
841                 policy_list[TOMOYO_ID_MANAGER],
842         };
843         int error = is_delete ? -ENOENT : -ENOMEM;
844         if (tomoyo_domain_def(manager)) {
845                 if (!tomoyo_correct_domain(manager))
846                         return -EINVAL;
847                 e.is_domain = true;
848         } else {
849                 if (!tomoyo_correct_path(manager))
850                         return -EINVAL;
851         }
852         e.manager = tomoyo_get_name(manager);
853         if (e.manager) {
854                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
855                                              tomoyo_same_manager);
856                 tomoyo_put_name(e.manager);
857         }
858         return error;
859 }
860
861 /**
862  * tomoyo_write_manager - Write manager policy.
863  *
864  * @head: Pointer to "struct tomoyo_io_buffer".
865  *
866  * Returns 0 on success, negative value otherwise.
867  *
868  * Caller holds tomoyo_read_lock().
869  */
870 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
871 {
872         char *data = head->write_buf;
873
874         if (!strcmp(data, "manage_by_non_root")) {
875                 tomoyo_manage_by_non_root = !head->w.is_delete;
876                 return 0;
877         }
878         return tomoyo_update_manager_entry(data, head->w.is_delete);
879 }
880
881 /**
882  * tomoyo_read_manager - Read manager policy.
883  *
884  * @head: Pointer to "struct tomoyo_io_buffer".
885  *
886  * Caller holds tomoyo_read_lock().
887  */
888 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
889 {
890         if (head->r.eof)
891                 return;
892         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
893                              policy_list[TOMOYO_ID_MANAGER]) {
894                 struct tomoyo_manager *ptr =
895                         list_entry(head->r.acl, typeof(*ptr), head.list);
896                 if (ptr->head.is_deleted)
897                         continue;
898                 if (!tomoyo_flush(head))
899                         return;
900                 tomoyo_set_string(head, ptr->manager->name);
901                 tomoyo_set_lf(head);
902         }
903         head->r.eof = true;
904 }
905
906 /**
907  * tomoyo_manager - Check whether the current process is a policy manager.
908  *
909  * Returns true if the current process is permitted to modify policy
910  * via /sys/kernel/security/tomoyo/ interface.
911  *
912  * Caller holds tomoyo_read_lock().
913  */
914 static bool tomoyo_manager(void)
915 {
916         struct tomoyo_manager *ptr;
917         const char *exe;
918         const struct task_struct *task = current;
919         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
920         bool found = false;
921
922         if (!tomoyo_policy_loaded)
923                 return true;
924         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
925                 return false;
926         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
927                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
928                 if (!ptr->head.is_deleted && ptr->is_domain
929                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
930                         found = true;
931                         break;
932                 }
933         }
934         if (found)
935                 return true;
936         exe = tomoyo_get_exe();
937         if (!exe)
938                 return false;
939         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
940                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
941                 if (!ptr->head.is_deleted && !ptr->is_domain
942                     && !strcmp(exe, ptr->manager->name)) {
943                         found = true;
944                         break;
945                 }
946         }
947         if (!found) { /* Reduce error messages. */
948                 static pid_t last_pid;
949                 const pid_t pid = current->pid;
950                 if (last_pid != pid) {
951                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
952                                "update policies.\n", domainname->name, exe);
953                         last_pid = pid;
954                 }
955         }
956         kfree(exe);
957         return found;
958 }
959
960 /**
961  * tomoyo_select_domain - Parse select command.
962  *
963  * @head: Pointer to "struct tomoyo_io_buffer".
964  * @data: String to parse.
965  *
966  * Returns true on success, false otherwise.
967  *
968  * Caller holds tomoyo_read_lock().
969  */
970 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
971                                  const char *data)
972 {
973         unsigned int pid;
974         struct tomoyo_domain_info *domain = NULL;
975         bool global_pid = false;
976         if (strncmp(data, "select ", 7))
977                 return false;
978         data += 7;
979         if (sscanf(data, "pid=%u", &pid) == 1 ||
980             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
981                 struct task_struct *p;
982                 rcu_read_lock();
983                 read_lock(&tasklist_lock);
984                 if (global_pid)
985                         p = find_task_by_pid_ns(pid, &init_pid_ns);
986                 else
987                         p = find_task_by_vpid(pid);
988                 if (p)
989                         domain = tomoyo_real_domain(p);
990                 read_unlock(&tasklist_lock);
991                 rcu_read_unlock();
992         } else if (!strncmp(data, "domain=", 7)) {
993                 if (tomoyo_domain_def(data + 7))
994                         domain = tomoyo_find_domain(data + 7);
995         } else
996                 return false;
997         head->w.domain = domain;
998         /* Accessing read_buf is safe because head->io_sem is held. */
999         if (!head->read_buf)
1000                 return true; /* Do nothing if open(O_WRONLY). */
1001         memset(&head->r, 0, sizeof(head->r));
1002         head->r.print_this_domain_only = true;
1003         if (domain)
1004                 head->r.domain = &domain->list;
1005         else
1006                 head->r.eof = 1;
1007         tomoyo_io_printf(head, "# select %s\n", data);
1008         if (domain && domain->is_deleted)
1009                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1010         return true;
1011 }
1012
1013 /**
1014  * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1015  *
1016  * @a: Pointer to "struct tomoyo_acl_info".
1017  * @b: Pointer to "struct tomoyo_acl_info".
1018  *
1019  * Returns true if @a == @b, false otherwise.
1020  */
1021 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1022                               const struct tomoyo_acl_info *b)
1023 {
1024         const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1025         const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1026         return p1->domainname == p2->domainname;
1027 }
1028
1029 /**
1030  * tomoyo_write_task - Update task related list.
1031  *
1032  * @param: Pointer to "struct tomoyo_acl_param".
1033  *
1034  * Returns 0 on success, negative value otherwise.
1035  *
1036  * Caller holds tomoyo_read_lock().
1037  */
1038 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1039 {
1040         int error = -EINVAL;
1041         if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1042                 struct tomoyo_task_acl e = {
1043                         .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1044                         .domainname = tomoyo_get_domainname(param),
1045                 };
1046                 if (e.domainname)
1047                         error = tomoyo_update_domain(&e.head, sizeof(e), param,
1048                                                      tomoyo_same_task_acl,
1049                                                      NULL);
1050                 tomoyo_put_name(e.domainname);
1051         }
1052         return error;
1053 }
1054
1055 /**
1056  * tomoyo_delete_domain - Delete a domain.
1057  *
1058  * @domainname: The name of domain.
1059  *
1060  * Returns 0.
1061  *
1062  * Caller holds tomoyo_read_lock().
1063  */
1064 static int tomoyo_delete_domain(char *domainname)
1065 {
1066         struct tomoyo_domain_info *domain;
1067         struct tomoyo_path_info name;
1068
1069         name.name = domainname;
1070         tomoyo_fill_path_info(&name);
1071         if (mutex_lock_interruptible(&tomoyo_policy_lock))
1072                 return 0;
1073         /* Is there an active domain? */
1074         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1075                 /* Never delete tomoyo_kernel_domain */
1076                 if (domain == &tomoyo_kernel_domain)
1077                         continue;
1078                 if (domain->is_deleted ||
1079                     tomoyo_pathcmp(domain->domainname, &name))
1080                         continue;
1081                 domain->is_deleted = true;
1082                 break;
1083         }
1084         mutex_unlock(&tomoyo_policy_lock);
1085         return 0;
1086 }
1087
1088 /**
1089  * tomoyo_write_domain2 - Write domain policy.
1090  *
1091  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1092  * @list:      Pointer to "struct list_head".
1093  * @data:      Policy to be interpreted.
1094  * @is_delete: True if it is a delete request.
1095  *
1096  * Returns 0 on success, negative value otherwise.
1097  *
1098  * Caller holds tomoyo_read_lock().
1099  */
1100 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1101                                 struct list_head *list, char *data,
1102                                 const bool is_delete)
1103 {
1104         struct tomoyo_acl_param param = {
1105                 .ns = ns,
1106                 .list = list,
1107                 .data = data,
1108                 .is_delete = is_delete,
1109         };
1110         static const struct {
1111                 const char *keyword;
1112                 int (*write) (struct tomoyo_acl_param *);
1113         } tomoyo_callback[5] = {
1114                 { "file ", tomoyo_write_file },
1115                 { "network inet ", tomoyo_write_inet_network },
1116                 { "network unix ", tomoyo_write_unix_network },
1117                 { "misc ", tomoyo_write_misc },
1118                 { "task ", tomoyo_write_task },
1119         };
1120         u8 i;
1121
1122         for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1123                 if (!tomoyo_str_starts(&param.data,
1124                                        tomoyo_callback[i].keyword))
1125                         continue;
1126                 return tomoyo_callback[i].write(&param);
1127         }
1128         return -EINVAL;
1129 }
1130
1131 /* String table for domain flags. */
1132 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1133         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1134         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1135 };
1136
1137 /**
1138  * tomoyo_write_domain - Write domain policy.
1139  *
1140  * @head: Pointer to "struct tomoyo_io_buffer".
1141  *
1142  * Returns 0 on success, negative value otherwise.
1143  *
1144  * Caller holds tomoyo_read_lock().
1145  */
1146 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1147 {
1148         char *data = head->write_buf;
1149         struct tomoyo_policy_namespace *ns;
1150         struct tomoyo_domain_info *domain = head->w.domain;
1151         const bool is_delete = head->w.is_delete;
1152         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1153         unsigned int profile;
1154         if (*data == '<') {
1155                 domain = NULL;
1156                 if (is_delete)
1157                         tomoyo_delete_domain(data);
1158                 else if (is_select)
1159                         domain = tomoyo_find_domain(data);
1160                 else
1161                         domain = tomoyo_assign_domain(data, false);
1162                 head->w.domain = domain;
1163                 return 0;
1164         }
1165         if (!domain)
1166                 return -EINVAL;
1167         ns = domain->ns;
1168         if (sscanf(data, "use_profile %u", &profile) == 1
1169             && profile < TOMOYO_MAX_PROFILES) {
1170                 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1171                         domain->profile = (u8) profile;
1172                 return 0;
1173         }
1174         if (sscanf(data, "use_group %u\n", &profile) == 1
1175             && profile < TOMOYO_MAX_ACL_GROUPS) {
1176                 if (!is_delete)
1177                         domain->group = (u8) profile;
1178                 return 0;
1179         }
1180         for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1181                 const char *cp = tomoyo_dif[profile];
1182                 if (strncmp(data, cp, strlen(cp) - 1))
1183                         continue;
1184                 domain->flags[profile] = !is_delete;
1185                 return 0;
1186         }
1187         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1188                                     is_delete);
1189 }
1190
1191 /**
1192  * tomoyo_print_condition - Print condition part.
1193  *
1194  * @head: Pointer to "struct tomoyo_io_buffer".
1195  * @cond: Pointer to "struct tomoyo_condition".
1196  *
1197  * Returns true on success, false otherwise.
1198  */
1199 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1200                                    const struct tomoyo_condition *cond)
1201 {
1202         switch (head->r.cond_step) {
1203         case 0:
1204                 head->r.cond_index = 0;
1205                 head->r.cond_step++;
1206                 /* fall through */
1207         case 1:
1208                 {
1209                         const u16 condc = cond->condc;
1210                         const struct tomoyo_condition_element *condp =
1211                                 (typeof(condp)) (cond + 1);
1212                         const struct tomoyo_number_union *numbers_p =
1213                                 (typeof(numbers_p)) (condp + condc);
1214                         const struct tomoyo_name_union *names_p =
1215                                 (typeof(names_p))
1216                                 (numbers_p + cond->numbers_count);
1217                         const struct tomoyo_argv *argv =
1218                                 (typeof(argv)) (names_p + cond->names_count);
1219                         const struct tomoyo_envp *envp =
1220                                 (typeof(envp)) (argv + cond->argc);
1221                         u16 skip;
1222                         for (skip = 0; skip < head->r.cond_index; skip++) {
1223                                 const u8 left = condp->left;
1224                                 const u8 right = condp->right;
1225                                 condp++;
1226                                 switch (left) {
1227                                 case TOMOYO_ARGV_ENTRY:
1228                                         argv++;
1229                                         continue;
1230                                 case TOMOYO_ENVP_ENTRY:
1231                                         envp++;
1232                                         continue;
1233                                 case TOMOYO_NUMBER_UNION:
1234                                         numbers_p++;
1235                                         break;
1236                                 }
1237                                 switch (right) {
1238                                 case TOMOYO_NAME_UNION:
1239                                         names_p++;
1240                                         break;
1241                                 case TOMOYO_NUMBER_UNION:
1242                                         numbers_p++;
1243                                         break;
1244                                 }
1245                         }
1246                         while (head->r.cond_index < condc) {
1247                                 const u8 match = condp->equals;
1248                                 const u8 left = condp->left;
1249                                 const u8 right = condp->right;
1250                                 if (!tomoyo_flush(head))
1251                                         return false;
1252                                 condp++;
1253                                 head->r.cond_index++;
1254                                 tomoyo_set_space(head);
1255                                 switch (left) {
1256                                 case TOMOYO_ARGV_ENTRY:
1257                                         tomoyo_io_printf(head,
1258                                                          "exec.argv[%lu]%s=\"",
1259                                                          argv->index, argv->
1260                                                          is_not ? "!" : "");
1261                                         tomoyo_set_string(head,
1262                                                           argv->value->name);
1263                                         tomoyo_set_string(head, "\"");
1264                                         argv++;
1265                                         continue;
1266                                 case TOMOYO_ENVP_ENTRY:
1267                                         tomoyo_set_string(head,
1268                                                           "exec.envp[\"");
1269                                         tomoyo_set_string(head,
1270                                                           envp->name->name);
1271                                         tomoyo_io_printf(head, "\"]%s=", envp->
1272                                                          is_not ? "!" : "");
1273                                         if (envp->value) {
1274                                                 tomoyo_set_string(head, "\"");
1275                                                 tomoyo_set_string(head, envp->
1276                                                                   value->name);
1277                                                 tomoyo_set_string(head, "\"");
1278                                         } else {
1279                                                 tomoyo_set_string(head,
1280                                                                   "NULL");
1281                                         }
1282                                         envp++;
1283                                         continue;
1284                                 case TOMOYO_NUMBER_UNION:
1285                                         tomoyo_print_number_union_nospace
1286                                                 (head, numbers_p++);
1287                                         break;
1288                                 default:
1289                                         tomoyo_set_string(head,
1290                                                tomoyo_condition_keyword[left]);
1291                                         break;
1292                                 }
1293                                 tomoyo_set_string(head, match ? "=" : "!=");
1294                                 switch (right) {
1295                                 case TOMOYO_NAME_UNION:
1296                                         tomoyo_print_name_union_quoted
1297                                                 (head, names_p++);
1298                                         break;
1299                                 case TOMOYO_NUMBER_UNION:
1300                                         tomoyo_print_number_union_nospace
1301                                                 (head, numbers_p++);
1302                                         break;
1303                                 default:
1304                                         tomoyo_set_string(head,
1305                                           tomoyo_condition_keyword[right]);
1306                                         break;
1307                                 }
1308                         }
1309                 }
1310                 head->r.cond_step++;
1311                 /* fall through */
1312         case 2:
1313                 if (!tomoyo_flush(head))
1314                         break;
1315                 head->r.cond_step++;
1316                 /* fall through */
1317         case 3:
1318                 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1319                         tomoyo_io_printf(head, " grant_log=%s",
1320                                          tomoyo_yesno(cond->grant_log ==
1321                                                       TOMOYO_GRANTLOG_YES));
1322                 tomoyo_set_lf(head);
1323                 return true;
1324         }
1325         return false;
1326 }
1327
1328 /**
1329  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1330  *
1331  * @head:     Pointer to "struct tomoyo_io_buffer".
1332  * @category: Category name.
1333  *
1334  * Returns nothing.
1335  */
1336 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1337                              const char *category)
1338 {
1339         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1340                 tomoyo_print_namespace(head);
1341                 tomoyo_io_printf(head, "acl_group %u ",
1342                                  head->r.acl_group_index);
1343         }
1344         tomoyo_set_string(head, category);
1345 }
1346
1347 /**
1348  * tomoyo_print_entry - Print an ACL entry.
1349  *
1350  * @head: Pointer to "struct tomoyo_io_buffer".
1351  * @acl:  Pointer to an ACL entry.
1352  *
1353  * Returns true on success, false otherwise.
1354  */
1355 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1356                                struct tomoyo_acl_info *acl)
1357 {
1358         const u8 acl_type = acl->type;
1359         bool first = true;
1360         u8 bit;
1361
1362         if (head->r.print_cond_part)
1363                 goto print_cond_part;
1364         if (acl->is_deleted)
1365                 return true;
1366         if (!tomoyo_flush(head))
1367                 return false;
1368         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1369                 struct tomoyo_path_acl *ptr =
1370                         container_of(acl, typeof(*ptr), head);
1371                 const u16 perm = ptr->perm;
1372                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1373                         if (!(perm & (1 << bit)))
1374                                 continue;
1375                         if (head->r.print_transition_related_only &&
1376                             bit != TOMOYO_TYPE_EXECUTE)
1377                                 continue;
1378                         if (first) {
1379                                 tomoyo_set_group(head, "file ");
1380                                 first = false;
1381                         } else {
1382                                 tomoyo_set_slash(head);
1383                         }
1384                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1385                 }
1386                 if (first)
1387                         return true;
1388                 tomoyo_print_name_union(head, &ptr->name);
1389         } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1390                 struct tomoyo_task_acl *ptr =
1391                         container_of(acl, typeof(*ptr), head);
1392                 tomoyo_set_group(head, "task ");
1393                 tomoyo_set_string(head, "manual_domain_transition ");
1394                 tomoyo_set_string(head, ptr->domainname->name);
1395         } else if (head->r.print_transition_related_only) {
1396                 return true;
1397         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1398                 struct tomoyo_path2_acl *ptr =
1399                         container_of(acl, typeof(*ptr), head);
1400                 const u8 perm = ptr->perm;
1401                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1402                         if (!(perm & (1 << bit)))
1403                                 continue;
1404                         if (first) {
1405                                 tomoyo_set_group(head, "file ");
1406                                 first = false;
1407                         } else {
1408                                 tomoyo_set_slash(head);
1409                         }
1410                         tomoyo_set_string(head, tomoyo_mac_keywords
1411                                           [tomoyo_pp2mac[bit]]);
1412                 }
1413                 if (first)
1414                         return true;
1415                 tomoyo_print_name_union(head, &ptr->name1);
1416                 tomoyo_print_name_union(head, &ptr->name2);
1417         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1418                 struct tomoyo_path_number_acl *ptr =
1419                         container_of(acl, typeof(*ptr), head);
1420                 const u8 perm = ptr->perm;
1421                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1422                         if (!(perm & (1 << bit)))
1423                                 continue;
1424                         if (first) {
1425                                 tomoyo_set_group(head, "file ");
1426                                 first = false;
1427                         } else {
1428                                 tomoyo_set_slash(head);
1429                         }
1430                         tomoyo_set_string(head, tomoyo_mac_keywords
1431                                           [tomoyo_pn2mac[bit]]);
1432                 }
1433                 if (first)
1434                         return true;
1435                 tomoyo_print_name_union(head, &ptr->name);
1436                 tomoyo_print_number_union(head, &ptr->number);
1437         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1438                 struct tomoyo_mkdev_acl *ptr =
1439                         container_of(acl, typeof(*ptr), head);
1440                 const u8 perm = ptr->perm;
1441                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1442                         if (!(perm & (1 << bit)))
1443                                 continue;
1444                         if (first) {
1445                                 tomoyo_set_group(head, "file ");
1446                                 first = false;
1447                         } else {
1448                                 tomoyo_set_slash(head);
1449                         }
1450                         tomoyo_set_string(head, tomoyo_mac_keywords
1451                                           [tomoyo_pnnn2mac[bit]]);
1452                 }
1453                 if (first)
1454                         return true;
1455                 tomoyo_print_name_union(head, &ptr->name);
1456                 tomoyo_print_number_union(head, &ptr->mode);
1457                 tomoyo_print_number_union(head, &ptr->major);
1458                 tomoyo_print_number_union(head, &ptr->minor);
1459         } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1460                 struct tomoyo_inet_acl *ptr =
1461                         container_of(acl, typeof(*ptr), head);
1462                 const u8 perm = ptr->perm;
1463
1464                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1465                         if (!(perm & (1 << bit)))
1466                                 continue;
1467                         if (first) {
1468                                 tomoyo_set_group(head, "network inet ");
1469                                 tomoyo_set_string(head, tomoyo_proto_keyword
1470                                                   [ptr->protocol]);
1471                                 tomoyo_set_space(head);
1472                                 first = false;
1473                         } else {
1474                                 tomoyo_set_slash(head);
1475                         }
1476                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1477                 }
1478                 if (first)
1479                         return true;
1480                 tomoyo_set_space(head);
1481                 if (ptr->address.group) {
1482                         tomoyo_set_string(head, "@");
1483                         tomoyo_set_string(head, ptr->address.group->group_name
1484                                           ->name);
1485                 } else {
1486                         char buf[128];
1487                         tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1488                         tomoyo_io_printf(head, "%s", buf);
1489                 }
1490                 tomoyo_print_number_union(head, &ptr->port);
1491         } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1492                 struct tomoyo_unix_acl *ptr =
1493                         container_of(acl, typeof(*ptr), head);
1494                 const u8 perm = ptr->perm;
1495
1496                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1497                         if (!(perm & (1 << bit)))
1498                                 continue;
1499                         if (first) {
1500                                 tomoyo_set_group(head, "network unix ");
1501                                 tomoyo_set_string(head, tomoyo_proto_keyword
1502                                                   [ptr->protocol]);
1503                                 tomoyo_set_space(head);
1504                                 first = false;
1505                         } else {
1506                                 tomoyo_set_slash(head);
1507                         }
1508                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1509                 }
1510                 if (first)
1511                         return true;
1512                 tomoyo_print_name_union(head, &ptr->name);
1513         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1514                 struct tomoyo_mount_acl *ptr =
1515                         container_of(acl, typeof(*ptr), head);
1516                 tomoyo_set_group(head, "file mount");
1517                 tomoyo_print_name_union(head, &ptr->dev_name);
1518                 tomoyo_print_name_union(head, &ptr->dir_name);
1519                 tomoyo_print_name_union(head, &ptr->fs_type);
1520                 tomoyo_print_number_union(head, &ptr->flags);
1521         } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1522                 struct tomoyo_env_acl *ptr =
1523                         container_of(acl, typeof(*ptr), head);
1524
1525                 tomoyo_set_group(head, "misc env ");
1526                 tomoyo_set_string(head, ptr->env->name);
1527         }
1528         if (acl->cond) {
1529                 head->r.print_cond_part = true;
1530                 head->r.cond_step = 0;
1531                 if (!tomoyo_flush(head))
1532                         return false;
1533 print_cond_part:
1534                 if (!tomoyo_print_condition(head, acl->cond))
1535                         return false;
1536                 head->r.print_cond_part = false;
1537         } else {
1538                 tomoyo_set_lf(head);
1539         }
1540         return true;
1541 }
1542
1543 /**
1544  * tomoyo_read_domain2 - Read domain policy.
1545  *
1546  * @head: Pointer to "struct tomoyo_io_buffer".
1547  * @list: Pointer to "struct list_head".
1548  *
1549  * Caller holds tomoyo_read_lock().
1550  *
1551  * Returns true on success, false otherwise.
1552  */
1553 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1554                                 struct list_head *list)
1555 {
1556         list_for_each_cookie(head->r.acl, list) {
1557                 struct tomoyo_acl_info *ptr =
1558                         list_entry(head->r.acl, typeof(*ptr), list);
1559                 if (!tomoyo_print_entry(head, ptr))
1560                         return false;
1561         }
1562         head->r.acl = NULL;
1563         return true;
1564 }
1565
1566 /**
1567  * tomoyo_read_domain - Read domain policy.
1568  *
1569  * @head: Pointer to "struct tomoyo_io_buffer".
1570  *
1571  * Caller holds tomoyo_read_lock().
1572  */
1573 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1574 {
1575         if (head->r.eof)
1576                 return;
1577         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1578                 struct tomoyo_domain_info *domain =
1579                         list_entry(head->r.domain, typeof(*domain), list);
1580                 switch (head->r.step) {
1581                         u8 i;
1582                 case 0:
1583                         if (domain->is_deleted &&
1584                             !head->r.print_this_domain_only)
1585                                 continue;
1586                         /* Print domainname and flags. */
1587                         tomoyo_set_string(head, domain->domainname->name);
1588                         tomoyo_set_lf(head);
1589                         tomoyo_io_printf(head, "use_profile %u\n",
1590                                          domain->profile);
1591                         tomoyo_io_printf(head, "use_group %u\n",
1592                                          domain->group);
1593                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1594                                 if (domain->flags[i])
1595                                         tomoyo_set_string(head, tomoyo_dif[i]);
1596                         head->r.step++;
1597                         tomoyo_set_lf(head);
1598                         /* fall through */
1599                 case 1:
1600                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1601                                 return;
1602                         head->r.step++;
1603                         if (!tomoyo_set_lf(head))
1604                                 return;
1605                         /* fall through */
1606                 case 2:
1607                         head->r.step = 0;
1608                         if (head->r.print_this_domain_only)
1609                                 goto done;
1610                 }
1611         }
1612  done:
1613         head->r.eof = true;
1614 }
1615
1616 /**
1617  * tomoyo_write_pid: Specify PID to obtain domainname.
1618  *
1619  * @head: Pointer to "struct tomoyo_io_buffer".
1620  *
1621  * Returns 0.
1622  */
1623 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1624 {
1625         head->r.eof = false;
1626         return 0;
1627 }
1628
1629 /**
1630  * tomoyo_read_pid - Get domainname of the specified PID.
1631  *
1632  * @head: Pointer to "struct tomoyo_io_buffer".
1633  *
1634  * Returns the domainname which the specified PID is in on success,
1635  * empty string otherwise.
1636  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1637  * using read()/write() interface rather than sysctl() interface.
1638  */
1639 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1640 {
1641         char *buf = head->write_buf;
1642         bool global_pid = false;
1643         unsigned int pid;
1644         struct task_struct *p;
1645         struct tomoyo_domain_info *domain = NULL;
1646
1647         /* Accessing write_buf is safe because head->io_sem is held. */
1648         if (!buf) {
1649                 head->r.eof = true;
1650                 return; /* Do nothing if open(O_RDONLY). */
1651         }
1652         if (head->r.w_pos || head->r.eof)
1653                 return;
1654         head->r.eof = true;
1655         if (tomoyo_str_starts(&buf, "global-pid "))
1656                 global_pid = true;
1657         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1658         rcu_read_lock();
1659         read_lock(&tasklist_lock);
1660         if (global_pid)
1661                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1662         else
1663                 p = find_task_by_vpid(pid);
1664         if (p)
1665                 domain = tomoyo_real_domain(p);
1666         read_unlock(&tasklist_lock);
1667         rcu_read_unlock();
1668         if (!domain)
1669                 return;
1670         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1671         tomoyo_set_string(head, domain->domainname->name);
1672 }
1673
1674 /* String table for domain transition control keywords. */
1675 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1676         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1677         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1678         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1679         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1680         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1681         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1682 };
1683
1684 /* String table for grouping keywords. */
1685 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1686         [TOMOYO_PATH_GROUP]    = "path_group ",
1687         [TOMOYO_NUMBER_GROUP]  = "number_group ",
1688         [TOMOYO_ADDRESS_GROUP] = "address_group ",
1689 };
1690
1691 /**
1692  * tomoyo_write_exception - Write exception policy.
1693  *
1694  * @head: Pointer to "struct tomoyo_io_buffer".
1695  *
1696  * Returns 0 on success, negative value otherwise.
1697  *
1698  * Caller holds tomoyo_read_lock().
1699  */
1700 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1701 {
1702         const bool is_delete = head->w.is_delete;
1703         struct tomoyo_acl_param param = {
1704                 .ns = head->w.ns,
1705                 .is_delete = is_delete,
1706                 .data = head->write_buf,
1707         };
1708         u8 i;
1709         if (tomoyo_str_starts(&param.data, "aggregator "))
1710                 return tomoyo_write_aggregator(&param);
1711         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1712                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1713                         return tomoyo_write_transition_control(&param, i);
1714         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1715                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1716                         return tomoyo_write_group(&param, i);
1717         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1718                 unsigned int group;
1719                 char *data;
1720                 group = simple_strtoul(param.data, &data, 10);
1721                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1722                         return tomoyo_write_domain2
1723                                 (head->w.ns, &head->w.ns->acl_group[group],
1724                                  data, is_delete);
1725         }
1726         return -EINVAL;
1727 }
1728
1729 /**
1730  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1731  *
1732  * @head: Pointer to "struct tomoyo_io_buffer".
1733  * @idx:  Index number.
1734  *
1735  * Returns true on success, false otherwise.
1736  *
1737  * Caller holds tomoyo_read_lock().
1738  */
1739 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1740 {
1741         struct tomoyo_policy_namespace *ns =
1742                 container_of(head->r.ns, typeof(*ns), namespace_list);
1743         struct list_head *list = &ns->group_list[idx];
1744         list_for_each_cookie(head->r.group, list) {
1745                 struct tomoyo_group *group =
1746                         list_entry(head->r.group, typeof(*group), head.list);
1747                 list_for_each_cookie(head->r.acl, &group->member_list) {
1748                         struct tomoyo_acl_head *ptr =
1749                                 list_entry(head->r.acl, typeof(*ptr), list);
1750                         if (ptr->is_deleted)
1751                                 continue;
1752                         if (!tomoyo_flush(head))
1753                                 return false;
1754                         tomoyo_print_namespace(head);
1755                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1756                         tomoyo_set_string(head, group->group_name->name);
1757                         if (idx == TOMOYO_PATH_GROUP) {
1758                                 tomoyo_set_space(head);
1759                                 tomoyo_set_string(head, container_of
1760                                                (ptr, struct tomoyo_path_group,
1761                                                 head)->member_name->name);
1762                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1763                                 tomoyo_print_number_union(head, &container_of
1764                                                           (ptr,
1765                                                    struct tomoyo_number_group,
1766                                                            head)->number);
1767                         } else if (idx == TOMOYO_ADDRESS_GROUP) {
1768                                 char buffer[128];
1769
1770                                 struct tomoyo_address_group *member =
1771                                         container_of(ptr, typeof(*member),
1772                                                      head);
1773                                 tomoyo_print_ip(buffer, sizeof(buffer),
1774                                                 &member->address);
1775                                 tomoyo_io_printf(head, " %s", buffer);
1776                         }
1777                         tomoyo_set_lf(head);
1778                 }
1779                 head->r.acl = NULL;
1780         }
1781         head->r.group = NULL;
1782         return true;
1783 }
1784
1785 /**
1786  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1787  *
1788  * @head: Pointer to "struct tomoyo_io_buffer".
1789  * @idx:  Index number.
1790  *
1791  * Returns true on success, false otherwise.
1792  *
1793  * Caller holds tomoyo_read_lock().
1794  */
1795 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1796 {
1797         struct tomoyo_policy_namespace *ns =
1798                 container_of(head->r.ns, typeof(*ns), namespace_list);
1799         struct list_head *list = &ns->policy_list[idx];
1800         list_for_each_cookie(head->r.acl, list) {
1801                 struct tomoyo_acl_head *acl =
1802                         container_of(head->r.acl, typeof(*acl), list);
1803                 if (acl->is_deleted)
1804                         continue;
1805                 if (!tomoyo_flush(head))
1806                         return false;
1807                 switch (idx) {
1808                 case TOMOYO_ID_TRANSITION_CONTROL:
1809                         {
1810                                 struct tomoyo_transition_control *ptr =
1811                                         container_of(acl, typeof(*ptr), head);
1812                                 tomoyo_print_namespace(head);
1813                                 tomoyo_set_string(head, tomoyo_transition_type
1814                                                   [ptr->type]);
1815                                 tomoyo_set_string(head, ptr->program ?
1816                                                   ptr->program->name : "any");
1817                                 tomoyo_set_string(head, " from ");
1818                                 tomoyo_set_string(head, ptr->domainname ?
1819                                                   ptr->domainname->name :
1820                                                   "any");
1821                         }
1822                         break;
1823                 case TOMOYO_ID_AGGREGATOR:
1824                         {
1825                                 struct tomoyo_aggregator *ptr =
1826                                         container_of(acl, typeof(*ptr), head);
1827                                 tomoyo_print_namespace(head);
1828                                 tomoyo_set_string(head, "aggregator ");
1829                                 tomoyo_set_string(head,
1830                                                   ptr->original_name->name);
1831                                 tomoyo_set_space(head);
1832                                 tomoyo_set_string(head,
1833                                                ptr->aggregated_name->name);
1834                         }
1835                         break;
1836                 default:
1837                         continue;
1838                 }
1839                 tomoyo_set_lf(head);
1840         }
1841         head->r.acl = NULL;
1842         return true;
1843 }
1844
1845 /**
1846  * tomoyo_read_exception - Read exception policy.
1847  *
1848  * @head: Pointer to "struct tomoyo_io_buffer".
1849  *
1850  * Caller holds tomoyo_read_lock().
1851  */
1852 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1853 {
1854         struct tomoyo_policy_namespace *ns =
1855                 container_of(head->r.ns, typeof(*ns), namespace_list);
1856         if (head->r.eof)
1857                 return;
1858         while (head->r.step < TOMOYO_MAX_POLICY &&
1859                tomoyo_read_policy(head, head->r.step))
1860                 head->r.step++;
1861         if (head->r.step < TOMOYO_MAX_POLICY)
1862                 return;
1863         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1864                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1865                 head->r.step++;
1866         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1867                 return;
1868         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1869                + TOMOYO_MAX_ACL_GROUPS) {
1870                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1871                         - TOMOYO_MAX_GROUP;
1872                 if (!tomoyo_read_domain2(head, &ns->acl_group
1873                                          [head->r.acl_group_index]))
1874                         return;
1875                 head->r.step++;
1876         }
1877         head->r.eof = true;
1878 }
1879
1880 /* Wait queue for kernel -> userspace notification. */
1881 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1882 /* Wait queue for userspace -> kernel notification. */
1883 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1884
1885 /* Structure for query. */
1886 struct tomoyo_query {
1887         struct list_head list;
1888         char *query;
1889         size_t query_len;
1890         unsigned int serial;
1891         u8 timer;
1892         u8 answer;
1893         u8 retry;
1894 };
1895
1896 /* The list for "struct tomoyo_query". */
1897 static LIST_HEAD(tomoyo_query_list);
1898
1899 /* Lock for manipulating tomoyo_query_list. */
1900 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1901
1902 /*
1903  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1904  * interface.
1905  */
1906 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1907
1908 /**
1909  * tomoyo_truncate - Truncate a line.
1910  *
1911  * @str: String to truncate.
1912  *
1913  * Returns length of truncated @str.
1914  */
1915 static int tomoyo_truncate(char *str)
1916 {
1917         char *start = str;
1918         while (*(unsigned char *) str > (unsigned char) ' ')
1919                 str++;
1920         *str = '\0';
1921         return strlen(start) + 1;
1922 }
1923
1924 /**
1925  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1926  *
1927  * @domain: Pointer to "struct tomoyo_domain_info".
1928  * @header: Lines containing ACL.
1929  *
1930  * Returns nothing.
1931  */
1932 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1933 {
1934         char *buffer;
1935         char *realpath = NULL;
1936         char *argv0 = NULL;
1937         char *symlink = NULL;
1938         char *cp = strchr(header, '\n');
1939         int len;
1940         if (!cp)
1941                 return;
1942         cp = strchr(cp + 1, '\n');
1943         if (!cp)
1944                 return;
1945         *cp++ = '\0';
1946         len = strlen(cp) + 1;
1947         /* strstr() will return NULL if ordering is wrong. */
1948         if (*cp == 'f') {
1949                 argv0 = strstr(header, " argv[]={ \"");
1950                 if (argv0) {
1951                         argv0 += 10;
1952                         len += tomoyo_truncate(argv0) + 14;
1953                 }
1954                 realpath = strstr(header, " exec={ realpath=\"");
1955                 if (realpath) {
1956                         realpath += 8;
1957                         len += tomoyo_truncate(realpath) + 6;
1958                 }
1959                 symlink = strstr(header, " symlink.target=\"");
1960                 if (symlink)
1961                         len += tomoyo_truncate(symlink + 1) + 1;
1962         }
1963         buffer = kmalloc(len, GFP_NOFS);
1964         if (!buffer)
1965                 return;
1966         snprintf(buffer, len - 1, "%s", cp);
1967         if (realpath)
1968                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1969         if (argv0)
1970                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1971         if (symlink)
1972                 tomoyo_addprintf(buffer, len, "%s", symlink);
1973         tomoyo_normalize_line(buffer);
1974         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1975                                   false))
1976                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1977         kfree(buffer);
1978 }
1979
1980 /**
1981  * tomoyo_supervisor - Ask for the supervisor's decision.
1982  *
1983  * @r:   Pointer to "struct tomoyo_request_info".
1984  * @fmt: The printf()'s format string, followed by parameters.
1985  *
1986  * Returns 0 if the supervisor decided to permit the access request which
1987  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1988  * supervisor decided to retry the access request which violated the policy in
1989  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1990  */
1991 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1992 {
1993         va_list args;
1994         int error;
1995         int len;
1996         static unsigned int tomoyo_serial;
1997         struct tomoyo_query entry = { };
1998         bool quota_exceeded = false;
1999         va_start(args, fmt);
2000         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2001         va_end(args);
2002         /* Write /sys/kernel/security/tomoyo/audit. */
2003         va_start(args, fmt);
2004         tomoyo_write_log2(r, len, fmt, args);
2005         va_end(args);
2006         /* Nothing more to do if granted. */
2007         if (r->granted)
2008                 return 0;
2009         if (r->mode)
2010                 tomoyo_update_stat(r->mode);
2011         switch (r->mode) {
2012         case TOMOYO_CONFIG_ENFORCING:
2013                 error = -EPERM;
2014                 if (atomic_read(&tomoyo_query_observers))
2015                         break;
2016                 goto out;
2017         case TOMOYO_CONFIG_LEARNING:
2018                 error = 0;
2019                 /* Check max_learning_entry parameter. */
2020                 if (tomoyo_domain_quota_is_ok(r))
2021                         break;
2022                 /* fall through */
2023         default:
2024                 return 0;
2025         }
2026         /* Get message. */
2027         va_start(args, fmt);
2028         entry.query = tomoyo_init_log(r, len, fmt, args);
2029         va_end(args);
2030         if (!entry.query)
2031                 goto out;
2032         entry.query_len = strlen(entry.query) + 1;
2033         if (!error) {
2034                 tomoyo_add_entry(r->domain, entry.query);
2035                 goto out;
2036         }
2037         len = tomoyo_round2(entry.query_len);
2038         spin_lock(&tomoyo_query_list_lock);
2039         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2040             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2041             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2042                 quota_exceeded = true;
2043         } else {
2044                 entry.serial = tomoyo_serial++;
2045                 entry.retry = r->retry;
2046                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2047                 list_add_tail(&entry.list, &tomoyo_query_list);
2048         }
2049         spin_unlock(&tomoyo_query_list_lock);
2050         if (quota_exceeded)
2051                 goto out;
2052         /* Give 10 seconds for supervisor's opinion. */
2053         while (entry.timer < 10) {
2054                 wake_up_all(&tomoyo_query_wait);
2055                 if (wait_event_interruptible_timeout
2056                     (tomoyo_answer_wait, entry.answer ||
2057                      !atomic_read(&tomoyo_query_observers), HZ))
2058                         break;
2059                 else
2060                         entry.timer++;
2061         }
2062         spin_lock(&tomoyo_query_list_lock);
2063         list_del(&entry.list);
2064         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2065         spin_unlock(&tomoyo_query_list_lock);
2066         switch (entry.answer) {
2067         case 3: /* Asked to retry by administrator. */
2068                 error = TOMOYO_RETRY_REQUEST;
2069                 r->retry++;
2070                 break;
2071         case 1:
2072                 /* Granted by administrator. */
2073                 error = 0;
2074                 break;
2075         default:
2076                 /* Timed out or rejected by administrator. */
2077                 break;
2078         }
2079 out:
2080         kfree(entry.query);
2081         return error;
2082 }
2083
2084 /**
2085  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2086  *
2087  * @file: Pointer to "struct file".
2088  * @wait: Pointer to "poll_table".
2089  *
2090  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2091  *
2092  * Waits for access requests which violated policy in enforcing mode.
2093  */
2094 static int tomoyo_poll_query(struct file *file, poll_table *wait)
2095 {
2096         struct list_head *tmp;
2097         bool found = false;
2098         u8 i;
2099         for (i = 0; i < 2; i++) {
2100                 spin_lock(&tomoyo_query_list_lock);
2101                 list_for_each(tmp, &tomoyo_query_list) {
2102                         struct tomoyo_query *ptr =
2103                                 list_entry(tmp, typeof(*ptr), list);
2104                         if (ptr->answer)
2105                                 continue;
2106                         found = true;
2107                         break;
2108                 }
2109                 spin_unlock(&tomoyo_query_list_lock);
2110                 if (found)
2111                         return POLLIN | POLLRDNORM;
2112                 if (i)
2113                         break;
2114                 poll_wait(file, &tomoyo_query_wait, wait);
2115         }
2116         return 0;
2117 }
2118
2119 /**
2120  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2121  *
2122  * @head: Pointer to "struct tomoyo_io_buffer".
2123  */
2124 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2125 {
2126         struct list_head *tmp;
2127         unsigned int pos = 0;
2128         size_t len = 0;
2129         char *buf;
2130         if (head->r.w_pos)
2131                 return;
2132         if (head->read_buf) {
2133                 kfree(head->read_buf);
2134                 head->read_buf = NULL;
2135         }
2136         spin_lock(&tomoyo_query_list_lock);
2137         list_for_each(tmp, &tomoyo_query_list) {
2138                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2139                 if (ptr->answer)
2140                         continue;
2141                 if (pos++ != head->r.query_index)
2142                         continue;
2143                 len = ptr->query_len;
2144                 break;
2145         }
2146         spin_unlock(&tomoyo_query_list_lock);
2147         if (!len) {
2148                 head->r.query_index = 0;
2149                 return;
2150         }
2151         buf = kzalloc(len + 32, GFP_NOFS);
2152         if (!buf)
2153                 return;
2154         pos = 0;
2155         spin_lock(&tomoyo_query_list_lock);
2156         list_for_each(tmp, &tomoyo_query_list) {
2157                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2158                 if (ptr->answer)
2159                         continue;
2160                 if (pos++ != head->r.query_index)
2161                         continue;
2162                 /*
2163                  * Some query can be skipped because tomoyo_query_list
2164                  * can change, but I don't care.
2165                  */
2166                 if (len == ptr->query_len)
2167                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2168                                  ptr->retry, ptr->query);
2169                 break;
2170         }
2171         spin_unlock(&tomoyo_query_list_lock);
2172         if (buf[0]) {
2173                 head->read_buf = buf;
2174                 head->r.w[head->r.w_pos++] = buf;
2175                 head->r.query_index++;
2176         } else {
2177                 kfree(buf);
2178         }
2179 }
2180
2181 /**
2182  * tomoyo_write_answer - Write the supervisor's decision.
2183  *
2184  * @head: Pointer to "struct tomoyo_io_buffer".
2185  *
2186  * Returns 0 on success, -EINVAL otherwise.
2187  */
2188 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2189 {
2190         char *data = head->write_buf;
2191         struct list_head *tmp;
2192         unsigned int serial;
2193         unsigned int answer;
2194         spin_lock(&tomoyo_query_list_lock);
2195         list_for_each(tmp, &tomoyo_query_list) {
2196                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2197                 ptr->timer = 0;
2198         }
2199         spin_unlock(&tomoyo_query_list_lock);
2200         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2201                 return -EINVAL;
2202         spin_lock(&tomoyo_query_list_lock);
2203         list_for_each(tmp, &tomoyo_query_list) {
2204                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2205                 if (ptr->serial != serial)
2206                         continue;
2207                 if (!ptr->answer)
2208                         ptr->answer = answer;
2209                 break;
2210         }
2211         spin_unlock(&tomoyo_query_list_lock);
2212         return 0;
2213 }
2214
2215 /**
2216  * tomoyo_read_version: Get version.
2217  *
2218  * @head: Pointer to "struct tomoyo_io_buffer".
2219  *
2220  * Returns version information.
2221  */
2222 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2223 {
2224         if (!head->r.eof) {
2225                 tomoyo_io_printf(head, "2.4.0");
2226                 head->r.eof = true;
2227         }
2228 }
2229
2230 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2231 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2232         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2233         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2234         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2235         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2236 };
2237
2238 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2239 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2240         [TOMOYO_MEMORY_POLICY] = "policy:",
2241         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2242         [TOMOYO_MEMORY_QUERY]  = "query message:",
2243 };
2244
2245 /* Timestamp counter for last updated. */
2246 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2247 /* Counter for number of updates. */
2248 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2249
2250 /**
2251  * tomoyo_update_stat - Update statistic counters.
2252  *
2253  * @index: Index for policy type.
2254  *
2255  * Returns nothing.
2256  */
2257 void tomoyo_update_stat(const u8 index)
2258 {
2259         struct timeval tv;
2260         do_gettimeofday(&tv);
2261         /*
2262          * I don't use atomic operations because race condition is not fatal.
2263          */
2264         tomoyo_stat_updated[index]++;
2265         tomoyo_stat_modified[index] = tv.tv_sec;
2266 }
2267
2268 /**
2269  * tomoyo_read_stat - Read statistic data.
2270  *
2271  * @head: Pointer to "struct tomoyo_io_buffer".
2272  *
2273  * Returns nothing.
2274  */
2275 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2276 {
2277         u8 i;
2278         unsigned int total = 0;
2279         if (head->r.eof)
2280                 return;
2281         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2282                 tomoyo_io_printf(head, "Policy %-30s %10u",
2283                                  tomoyo_policy_headers[i],
2284                                  tomoyo_stat_updated[i]);
2285                 if (tomoyo_stat_modified[i]) {
2286                         struct tomoyo_time stamp;
2287                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2288                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2289                                          "%02u:%02u:%02u)",
2290                                          stamp.year, stamp.month, stamp.day,
2291                                          stamp.hour, stamp.min, stamp.sec);
2292                 }
2293                 tomoyo_set_lf(head);
2294         }
2295         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2296                 unsigned int used = tomoyo_memory_used[i];
2297                 total += used;
2298                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2299                                  tomoyo_memory_headers[i], used);
2300                 used = tomoyo_memory_quota[i];
2301                 if (used)
2302                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2303                 tomoyo_set_lf(head);
2304         }
2305         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2306                          total);
2307         head->r.eof = true;
2308 }
2309
2310 /**
2311  * tomoyo_write_stat - Set memory quota.
2312  *
2313  * @head: Pointer to "struct tomoyo_io_buffer".
2314  *
2315  * Returns 0.
2316  */
2317 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2318 {
2319         char *data = head->write_buf;
2320         u8 i;
2321         if (tomoyo_str_starts(&data, "Memory used by "))
2322                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2323                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2324                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2325         return 0;
2326 }
2327
2328 /**
2329  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2330  *
2331  * @type: Type of interface.
2332  * @file: Pointer to "struct file".
2333  *
2334  * Returns 0 on success, negative value otherwise.
2335  */
2336 int tomoyo_open_control(const u8 type, struct file *file)
2337 {
2338         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2339
2340         if (!head)
2341                 return -ENOMEM;
2342         mutex_init(&head->io_sem);
2343         head->type = type;
2344         switch (type) {
2345         case TOMOYO_DOMAINPOLICY:
2346                 /* /sys/kernel/security/tomoyo/domain_policy */
2347                 head->write = tomoyo_write_domain;
2348                 head->read = tomoyo_read_domain;
2349                 break;
2350         case TOMOYO_EXCEPTIONPOLICY:
2351                 /* /sys/kernel/security/tomoyo/exception_policy */
2352                 head->write = tomoyo_write_exception;
2353                 head->read = tomoyo_read_exception;
2354                 break;
2355         case TOMOYO_AUDIT:
2356                 /* /sys/kernel/security/tomoyo/audit */
2357                 head->poll = tomoyo_poll_log;
2358                 head->read = tomoyo_read_log;
2359                 break;
2360         case TOMOYO_PROCESS_STATUS:
2361                 /* /sys/kernel/security/tomoyo/.process_status */
2362                 head->write = tomoyo_write_pid;
2363                 head->read = tomoyo_read_pid;
2364                 break;
2365         case TOMOYO_VERSION:
2366                 /* /sys/kernel/security/tomoyo/version */
2367                 head->read = tomoyo_read_version;
2368                 head->readbuf_size = 128;
2369                 break;
2370         case TOMOYO_STAT:
2371                 /* /sys/kernel/security/tomoyo/stat */
2372                 head->write = tomoyo_write_stat;
2373                 head->read = tomoyo_read_stat;
2374                 head->readbuf_size = 1024;
2375                 break;
2376         case TOMOYO_PROFILE:
2377                 /* /sys/kernel/security/tomoyo/profile */
2378                 head->write = tomoyo_write_profile;
2379                 head->read = tomoyo_read_profile;
2380                 break;
2381         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2382                 head->poll = tomoyo_poll_query;
2383                 head->write = tomoyo_write_answer;
2384                 head->read = tomoyo_read_query;
2385                 break;
2386         case TOMOYO_MANAGER:
2387                 /* /sys/kernel/security/tomoyo/manager */
2388                 head->write = tomoyo_write_manager;
2389                 head->read = tomoyo_read_manager;
2390                 break;
2391         }
2392         if (!(file->f_mode & FMODE_READ)) {
2393                 /*
2394                  * No need to allocate read_buf since it is not opened
2395                  * for reading.
2396                  */
2397                 head->read = NULL;
2398                 head->poll = NULL;
2399         } else if (!head->poll) {
2400                 /* Don't allocate read_buf for poll() access. */
2401                 if (!head->readbuf_size)
2402                         head->readbuf_size = 4096 * 2;
2403                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2404                 if (!head->read_buf) {
2405                         kfree(head);
2406                         return -ENOMEM;
2407                 }
2408         }
2409         if (!(file->f_mode & FMODE_WRITE)) {
2410                 /*
2411                  * No need to allocate write_buf since it is not opened
2412                  * for writing.
2413                  */
2414                 head->write = NULL;
2415         } else if (head->write) {
2416                 head->writebuf_size = 4096 * 2;
2417                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2418                 if (!head->write_buf) {
2419                         kfree(head->read_buf);
2420                         kfree(head);
2421                         return -ENOMEM;
2422                 }
2423         }
2424         /*
2425          * If the file is /sys/kernel/security/tomoyo/query , increment the
2426          * observer counter.
2427          * The obserber counter is used by tomoyo_supervisor() to see if
2428          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2429          */
2430         if (type == TOMOYO_QUERY)
2431                 atomic_inc(&tomoyo_query_observers);
2432         file->private_data = head;
2433         tomoyo_notify_gc(head, true);
2434         return 0;
2435 }
2436
2437 /**
2438  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2439  *
2440  * @file: Pointer to "struct file".
2441  * @wait: Pointer to "poll_table".
2442  *
2443  * Waits for read readiness.
2444  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
2445  * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
2446  */
2447 int tomoyo_poll_control(struct file *file, poll_table *wait)
2448 {
2449         struct tomoyo_io_buffer *head = file->private_data;
2450         if (!head->poll)
2451                 return -ENOSYS;
2452         return head->poll(file, wait);
2453 }
2454
2455 /**
2456  * tomoyo_set_namespace_cursor - Set namespace to read.
2457  *
2458  * @head: Pointer to "struct tomoyo_io_buffer".
2459  *
2460  * Returns nothing.
2461  */
2462 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2463 {
2464         struct list_head *ns;
2465         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2466             head->type != TOMOYO_PROFILE)
2467                 return;
2468         /*
2469          * If this is the first read, or reading previous namespace finished
2470          * and has more namespaces to read, update the namespace cursor.
2471          */
2472         ns = head->r.ns;
2473         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2474                 /* Clearing is OK because tomoyo_flush() returned true. */
2475                 memset(&head->r, 0, sizeof(head->r));
2476                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2477         }
2478 }
2479
2480 /**
2481  * tomoyo_has_more_namespace - Check for unread namespaces.
2482  *
2483  * @head: Pointer to "struct tomoyo_io_buffer".
2484  *
2485  * Returns true if we have more entries to print, false otherwise.
2486  */
2487 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2488 {
2489         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2490                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2491                 head->r.ns->next != &tomoyo_namespace_list;
2492 }
2493
2494 /**
2495  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2496  *
2497  * @head:       Pointer to "struct tomoyo_io_buffer".
2498  * @buffer:     Poiner to buffer to write to.
2499  * @buffer_len: Size of @buffer.
2500  *
2501  * Returns bytes read on success, negative value otherwise.
2502  */
2503 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2504                             const int buffer_len)
2505 {
2506         int len;
2507         int idx;
2508
2509         if (!head->read)
2510                 return -ENOSYS;
2511         if (mutex_lock_interruptible(&head->io_sem))
2512                 return -EINTR;
2513         head->read_user_buf = buffer;
2514         head->read_user_buf_avail = buffer_len;
2515         idx = tomoyo_read_lock();
2516         if (tomoyo_flush(head))
2517                 /* Call the policy handler. */
2518                 do {
2519                         tomoyo_set_namespace_cursor(head);
2520                         head->read(head);
2521                 } while (tomoyo_flush(head) &&
2522                          tomoyo_has_more_namespace(head));
2523         tomoyo_read_unlock(idx);
2524         len = head->read_user_buf - buffer;
2525         mutex_unlock(&head->io_sem);
2526         return len;
2527 }
2528
2529 /**
2530  * tomoyo_parse_policy - Parse a policy line.
2531  *
2532  * @head: Poiter to "struct tomoyo_io_buffer".
2533  * @line: Line to parse.
2534  *
2535  * Returns 0 on success, negative value otherwise.
2536  *
2537  * Caller holds tomoyo_read_lock().
2538  */
2539 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2540 {
2541         /* Delete request? */
2542         head->w.is_delete = !strncmp(line, "delete ", 7);
2543         if (head->w.is_delete)
2544                 memmove(line, line + 7, strlen(line + 7) + 1);
2545         /* Selecting namespace to update. */
2546         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2547             head->type == TOMOYO_PROFILE) {
2548                 if (*line == '<') {
2549                         char *cp = strchr(line, ' ');
2550                         if (cp) {
2551                                 *cp++ = '\0';
2552                                 head->w.ns = tomoyo_assign_namespace(line);
2553                                 memmove(line, cp, strlen(cp) + 1);
2554                         } else
2555                                 head->w.ns = NULL;
2556                 } else
2557                         head->w.ns = &tomoyo_kernel_namespace;
2558                 /* Don't allow updating if namespace is invalid. */
2559                 if (!head->w.ns)
2560                         return -ENOENT;
2561         }
2562         /* Do the update. */
2563         return head->write(head);
2564 }
2565
2566 /**
2567  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2568  *
2569  * @head:       Pointer to "struct tomoyo_io_buffer".
2570  * @buffer:     Pointer to buffer to read from.
2571  * @buffer_len: Size of @buffer.
2572  *
2573  * Returns @buffer_len on success, negative value otherwise.
2574  */
2575 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2576                              const char __user *buffer, const int buffer_len)
2577 {
2578         int error = buffer_len;
2579         size_t avail_len = buffer_len;
2580         char *cp0 = head->write_buf;
2581         int idx;
2582         if (!head->write)
2583                 return -ENOSYS;
2584         if (!access_ok(VERIFY_READ, buffer, buffer_len))
2585                 return -EFAULT;
2586         if (mutex_lock_interruptible(&head->io_sem))
2587                 return -EINTR;
2588         idx = tomoyo_read_lock();
2589         /* Read a line and dispatch it to the policy handler. */
2590         while (avail_len > 0) {
2591                 char c;
2592                 if (head->w.avail >= head->writebuf_size - 1) {
2593                         const int len = head->writebuf_size * 2;
2594                         char *cp = kzalloc(len, GFP_NOFS);
2595                         if (!cp) {
2596                                 error = -ENOMEM;
2597                                 break;
2598                         }
2599                         memmove(cp, cp0, head->w.avail);
2600                         kfree(cp0);
2601                         head->write_buf = cp;
2602                         cp0 = cp;
2603                         head->writebuf_size = len;
2604                 }
2605                 if (get_user(c, buffer)) {
2606                         error = -EFAULT;
2607                         break;
2608                 }
2609                 buffer++;
2610                 avail_len--;
2611                 cp0[head->w.avail++] = c;
2612                 if (c != '\n')
2613                         continue;
2614                 cp0[head->w.avail - 1] = '\0';
2615                 head->w.avail = 0;
2616                 tomoyo_normalize_line(cp0);
2617                 if (!strcmp(cp0, "reset")) {
2618                         head->w.ns = &tomoyo_kernel_namespace;
2619                         head->w.domain = NULL;
2620                         memset(&head->r, 0, sizeof(head->r));
2621                         continue;
2622                 }
2623                 /* Don't allow updating policies by non manager programs. */
2624                 switch (head->type) {
2625                 case TOMOYO_PROCESS_STATUS:
2626                         /* This does not write anything. */
2627                         break;
2628                 case TOMOYO_DOMAINPOLICY:
2629                         if (tomoyo_select_domain(head, cp0))
2630                                 continue;
2631                         /* fall through */
2632                 case TOMOYO_EXCEPTIONPOLICY:
2633                         if (!strcmp(cp0, "select transition_only")) {
2634                                 head->r.print_transition_related_only = true;
2635                                 continue;
2636                         }
2637                         /* fall through */
2638                 default:
2639                         if (!tomoyo_manager()) {
2640                                 error = -EPERM;
2641                                 goto out;
2642                         }
2643                 }
2644                 switch (tomoyo_parse_policy(head, cp0)) {
2645                 case -EPERM:
2646                         error = -EPERM;
2647                         goto out;
2648                 case 0:
2649                         switch (head->type) {
2650                         case TOMOYO_DOMAINPOLICY:
2651                         case TOMOYO_EXCEPTIONPOLICY:
2652                         case TOMOYO_STAT:
2653                         case TOMOYO_PROFILE:
2654                         case TOMOYO_MANAGER:
2655                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2656                                 break;
2657                         default:
2658                                 break;
2659                         }
2660                         break;
2661                 }
2662         }
2663 out:
2664         tomoyo_read_unlock(idx);
2665         mutex_unlock(&head->io_sem);
2666         return error;
2667 }
2668
2669 /**
2670  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2671  *
2672  * @head: Pointer to "struct tomoyo_io_buffer".
2673  *
2674  * Returns 0.
2675  */
2676 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2677 {
2678         /*
2679          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2680          * observer counter.
2681          */
2682         if (head->type == TOMOYO_QUERY &&
2683             atomic_dec_and_test(&tomoyo_query_observers))
2684                 wake_up_all(&tomoyo_answer_wait);
2685         tomoyo_notify_gc(head, false);
2686         return 0;
2687 }
2688
2689 /**
2690  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2691  */
2692 void tomoyo_check_profile(void)
2693 {
2694         struct tomoyo_domain_info *domain;
2695         const int idx = tomoyo_read_lock();
2696         tomoyo_policy_loaded = true;
2697         printk(KERN_INFO "TOMOYO: 2.4.0\n");
2698         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2699                 const u8 profile = domain->profile;
2700                 const struct tomoyo_policy_namespace *ns = domain->ns;
2701                 if (ns->profile_version != 20100903)
2702                         printk(KERN_ERR
2703                                "Profile version %u is not supported.\n",
2704                                ns->profile_version);
2705                 else if (!ns->profile_ptr[profile])
2706                         printk(KERN_ERR
2707                                "Profile %u (used by '%s') is not defined.\n",
2708                                profile, domain->domainname->name);
2709                 else
2710                         continue;
2711                 printk(KERN_ERR
2712                        "Userland tools for TOMOYO 2.4 must be installed and "
2713                        "policy must be initialized.\n");
2714                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.4/ "
2715                        "for more information.\n");
2716                 panic("STOP!");
2717         }
2718         tomoyo_read_unlock(idx);
2719         printk(KERN_INFO "Mandatory Access Control activated.\n");
2720 }
2721
2722 /**
2723  * tomoyo_load_builtin_policy - Load built-in policy.
2724  *
2725  * Returns nothing.
2726  */
2727 void __init tomoyo_load_builtin_policy(void)
2728 {
2729         /*
2730          * This include file is manually created and contains built-in policy
2731          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2732          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2733          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2734          */
2735 #include "builtin-policy.h"
2736         u8 i;
2737         const int idx = tomoyo_read_lock();
2738         for (i = 0; i < 5; i++) {
2739                 struct tomoyo_io_buffer head = { };
2740                 char *start = "";
2741                 switch (i) {
2742                 case 0:
2743                         start = tomoyo_builtin_profile;
2744                         head.type = TOMOYO_PROFILE;
2745                         head.write = tomoyo_write_profile;
2746                         break;
2747                 case 1:
2748                         start = tomoyo_builtin_exception_policy;
2749                         head.type = TOMOYO_EXCEPTIONPOLICY;
2750                         head.write = tomoyo_write_exception;
2751                         break;
2752                 case 2:
2753                         start = tomoyo_builtin_domain_policy;
2754                         head.type = TOMOYO_DOMAINPOLICY;
2755                         head.write = tomoyo_write_domain;
2756                         break;
2757                 case 3:
2758                         start = tomoyo_builtin_manager;
2759                         head.type = TOMOYO_MANAGER;
2760                         head.write = tomoyo_write_manager;
2761                         break;
2762                 case 4:
2763                         start = tomoyo_builtin_stat;
2764                         head.type = TOMOYO_STAT;
2765                         head.write = tomoyo_write_stat;
2766                         break;
2767                 }
2768                 while (1) {
2769                         char *end = strchr(start, '\n');
2770                         if (!end)
2771                                 break;
2772                         *end = '\0';
2773                         tomoyo_normalize_line(start);
2774                         head.write_buf = start;
2775                         tomoyo_parse_policy(&head, start);
2776                         start = end + 1;
2777                 }
2778         }
2779         tomoyo_read_unlock(idx);
2780 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2781         tomoyo_check_profile();
2782 #endif
2783 }