c8439cf2a448869820cc5dbf175c45956d9d7698
[linux-3.10.git] / security / tomoyo / common.c
1 /*
2  * security/tomoyo/common.c
3  *
4  * Copyright (C) 2005-2011  NTT DATA CORPORATION
5  */
6
7 #include <linux/uaccess.h>
8 #include <linux/slab.h>
9 #include <linux/security.h>
10 #include "common.h"
11
12 /* String table for operation mode. */
13 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
14         [TOMOYO_CONFIG_DISABLED]   = "disabled",
15         [TOMOYO_CONFIG_LEARNING]   = "learning",
16         [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
17         [TOMOYO_CONFIG_ENFORCING]  = "enforcing"
18 };
19
20 /* String table for /sys/kernel/security/tomoyo/profile */
21 const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
22                                        + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
23         [TOMOYO_MAC_FILE_EXECUTE]    = "execute",
24         [TOMOYO_MAC_FILE_OPEN]       = "open",
25         [TOMOYO_MAC_FILE_CREATE]     = "create",
26         [TOMOYO_MAC_FILE_UNLINK]     = "unlink",
27         [TOMOYO_MAC_FILE_GETATTR]    = "getattr",
28         [TOMOYO_MAC_FILE_MKDIR]      = "mkdir",
29         [TOMOYO_MAC_FILE_RMDIR]      = "rmdir",
30         [TOMOYO_MAC_FILE_MKFIFO]     = "mkfifo",
31         [TOMOYO_MAC_FILE_MKSOCK]     = "mksock",
32         [TOMOYO_MAC_FILE_TRUNCATE]   = "truncate",
33         [TOMOYO_MAC_FILE_SYMLINK]    = "symlink",
34         [TOMOYO_MAC_FILE_MKBLOCK]    = "mkblock",
35         [TOMOYO_MAC_FILE_MKCHAR]     = "mkchar",
36         [TOMOYO_MAC_FILE_LINK]       = "link",
37         [TOMOYO_MAC_FILE_RENAME]     = "rename",
38         [TOMOYO_MAC_FILE_CHMOD]      = "chmod",
39         [TOMOYO_MAC_FILE_CHOWN]      = "chown",
40         [TOMOYO_MAC_FILE_CHGRP]      = "chgrp",
41         [TOMOYO_MAC_FILE_IOCTL]      = "ioctl",
42         [TOMOYO_MAC_FILE_CHROOT]     = "chroot",
43         [TOMOYO_MAC_FILE_MOUNT]      = "mount",
44         [TOMOYO_MAC_FILE_UMOUNT]     = "unmount",
45         [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
46         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
47 };
48
49 /* String table for conditions. */
50 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
51         [TOMOYO_TASK_UID]             = "task.uid",
52         [TOMOYO_TASK_EUID]            = "task.euid",
53         [TOMOYO_TASK_SUID]            = "task.suid",
54         [TOMOYO_TASK_FSUID]           = "task.fsuid",
55         [TOMOYO_TASK_GID]             = "task.gid",
56         [TOMOYO_TASK_EGID]            = "task.egid",
57         [TOMOYO_TASK_SGID]            = "task.sgid",
58         [TOMOYO_TASK_FSGID]           = "task.fsgid",
59         [TOMOYO_TASK_PID]             = "task.pid",
60         [TOMOYO_TASK_PPID]            = "task.ppid",
61         [TOMOYO_EXEC_ARGC]            = "exec.argc",
62         [TOMOYO_EXEC_ENVC]            = "exec.envc",
63         [TOMOYO_TYPE_IS_SOCKET]       = "socket",
64         [TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
65         [TOMOYO_TYPE_IS_FILE]         = "file",
66         [TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
67         [TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
68         [TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
69         [TOMOYO_TYPE_IS_FIFO]         = "fifo",
70         [TOMOYO_MODE_SETUID]          = "setuid",
71         [TOMOYO_MODE_SETGID]          = "setgid",
72         [TOMOYO_MODE_STICKY]          = "sticky",
73         [TOMOYO_MODE_OWNER_READ]      = "owner_read",
74         [TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
75         [TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
76         [TOMOYO_MODE_GROUP_READ]      = "group_read",
77         [TOMOYO_MODE_GROUP_WRITE]     = "group_write",
78         [TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
79         [TOMOYO_MODE_OTHERS_READ]     = "others_read",
80         [TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
81         [TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
82         [TOMOYO_EXEC_REALPATH]        = "exec.realpath",
83         [TOMOYO_SYMLINK_TARGET]       = "symlink.target",
84         [TOMOYO_PATH1_UID]            = "path1.uid",
85         [TOMOYO_PATH1_GID]            = "path1.gid",
86         [TOMOYO_PATH1_INO]            = "path1.ino",
87         [TOMOYO_PATH1_MAJOR]          = "path1.major",
88         [TOMOYO_PATH1_MINOR]          = "path1.minor",
89         [TOMOYO_PATH1_PERM]           = "path1.perm",
90         [TOMOYO_PATH1_TYPE]           = "path1.type",
91         [TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
92         [TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
93         [TOMOYO_PATH2_UID]            = "path2.uid",
94         [TOMOYO_PATH2_GID]            = "path2.gid",
95         [TOMOYO_PATH2_INO]            = "path2.ino",
96         [TOMOYO_PATH2_MAJOR]          = "path2.major",
97         [TOMOYO_PATH2_MINOR]          = "path2.minor",
98         [TOMOYO_PATH2_PERM]           = "path2.perm",
99         [TOMOYO_PATH2_TYPE]           = "path2.type",
100         [TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
101         [TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
102         [TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
103         [TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
104         [TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
105         [TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
106         [TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
107         [TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
108         [TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
109         [TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
110 };
111
112 /* String table for PREFERENCE keyword. */
113 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
114         [TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
115         [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
116 };
117
118 /* String table for path operation. */
119 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
120         [TOMOYO_TYPE_EXECUTE]    = "execute",
121         [TOMOYO_TYPE_READ]       = "read",
122         [TOMOYO_TYPE_WRITE]      = "write",
123         [TOMOYO_TYPE_APPEND]     = "append",
124         [TOMOYO_TYPE_UNLINK]     = "unlink",
125         [TOMOYO_TYPE_GETATTR]    = "getattr",
126         [TOMOYO_TYPE_RMDIR]      = "rmdir",
127         [TOMOYO_TYPE_TRUNCATE]   = "truncate",
128         [TOMOYO_TYPE_SYMLINK]    = "symlink",
129         [TOMOYO_TYPE_CHROOT]     = "chroot",
130         [TOMOYO_TYPE_UMOUNT]     = "unmount",
131 };
132
133 /* String table for categories. */
134 static const char * const tomoyo_category_keywords
135 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
136         [TOMOYO_MAC_CATEGORY_FILE]       = "file",
137 };
138
139 /* Permit policy management by non-root user? */
140 static bool tomoyo_manage_by_non_root;
141
142 /* Utility functions. */
143
144 /**
145  * tomoyo_yesno - Return "yes" or "no".
146  *
147  * @value: Bool value.
148  */
149 const char *tomoyo_yesno(const unsigned int value)
150 {
151         return value ? "yes" : "no";
152 }
153
154 /**
155  * tomoyo_addprintf - strncat()-like-snprintf().
156  *
157  * @buffer: Buffer to write to. Must be '\0'-terminated.
158  * @len:    Size of @buffer.
159  * @fmt:    The printf()'s format string, followed by parameters.
160  *
161  * Returns nothing.
162  */
163 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
164 {
165         va_list args;
166         const int pos = strlen(buffer);
167         va_start(args, fmt);
168         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
169         va_end(args);
170 }
171
172 /**
173  * tomoyo_flush - Flush queued string to userspace's buffer.
174  *
175  * @head:   Pointer to "struct tomoyo_io_buffer".
176  *
177  * Returns true if all data was flushed, false otherwise.
178  */
179 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
180 {
181         while (head->r.w_pos) {
182                 const char *w = head->r.w[0];
183                 size_t len = strlen(w);
184                 if (len) {
185                         if (len > head->read_user_buf_avail)
186                                 len = head->read_user_buf_avail;
187                         if (!len)
188                                 return false;
189                         if (copy_to_user(head->read_user_buf, w, len))
190                                 return false;
191                         head->read_user_buf_avail -= len;
192                         head->read_user_buf += len;
193                         w += len;
194                 }
195                 head->r.w[0] = w;
196                 if (*w)
197                         return false;
198                 /* Add '\0' for audit logs and query. */
199                 if (head->poll) {
200                         if (!head->read_user_buf_avail ||
201                             copy_to_user(head->read_user_buf, "", 1))
202                                 return false;
203                         head->read_user_buf_avail--;
204                         head->read_user_buf++;
205                 }
206                 head->r.w_pos--;
207                 for (len = 0; len < head->r.w_pos; len++)
208                         head->r.w[len] = head->r.w[len + 1];
209         }
210         head->r.avail = 0;
211         return true;
212 }
213
214 /**
215  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
216  *
217  * @head:   Pointer to "struct tomoyo_io_buffer".
218  * @string: String to print.
219  *
220  * Note that @string has to be kept valid until @head is kfree()d.
221  * This means that char[] allocated on stack memory cannot be passed to
222  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
223  */
224 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
225 {
226         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
227                 head->r.w[head->r.w_pos++] = string;
228                 tomoyo_flush(head);
229         } else
230                 WARN_ON(1);
231 }
232
233 /**
234  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
235  *
236  * @head: Pointer to "struct tomoyo_io_buffer".
237  * @fmt:  The printf()'s format string, followed by parameters.
238  */
239 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
240 {
241         va_list args;
242         size_t len;
243         size_t pos = head->r.avail;
244         int size = head->readbuf_size - pos;
245         if (size <= 0)
246                 return;
247         va_start(args, fmt);
248         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
249         va_end(args);
250         if (pos + len >= head->readbuf_size) {
251                 WARN_ON(1);
252                 return;
253         }
254         head->r.avail += len;
255         tomoyo_set_string(head, head->read_buf + pos);
256 }
257
258 /**
259  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
260  *
261  * @head: Pointer to "struct tomoyo_io_buffer".
262  *
263  * Returns nothing.
264  */
265 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
266 {
267         tomoyo_set_string(head, " ");
268 }
269
270 /**
271  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
272  *
273  * @head: Pointer to "struct tomoyo_io_buffer".
274  *
275  * Returns nothing.
276  */
277 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
278 {
279         tomoyo_set_string(head, "\n");
280         return !head->r.w_pos;
281 }
282
283 /**
284  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
285  *
286  * @head: Pointer to "struct tomoyo_io_buffer".
287  *
288  * Returns nothing.
289  */
290 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
291 {
292         tomoyo_set_string(head, "/");
293 }
294
295 /* List of namespaces. */
296 LIST_HEAD(tomoyo_namespace_list);
297 /* True if namespace other than tomoyo_kernel_namespace is defined. */
298 static bool tomoyo_namespace_enabled;
299
300 /**
301  * tomoyo_init_policy_namespace - Initialize namespace.
302  *
303  * @ns: Pointer to "struct tomoyo_policy_namespace".
304  *
305  * Returns nothing.
306  */
307 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
308 {
309         unsigned int idx;
310         for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
311                 INIT_LIST_HEAD(&ns->acl_group[idx]);
312         for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
313                 INIT_LIST_HEAD(&ns->group_list[idx]);
314         for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
315                 INIT_LIST_HEAD(&ns->policy_list[idx]);
316         ns->profile_version = 20100903;
317         tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
318         list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
319 }
320
321 /**
322  * tomoyo_print_namespace - Print namespace header.
323  *
324  * @head: Pointer to "struct tomoyo_io_buffer".
325  *
326  * Returns nothing.
327  */
328 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
329 {
330         if (!tomoyo_namespace_enabled)
331                 return;
332         tomoyo_set_string(head,
333                           container_of(head->r.ns,
334                                        struct tomoyo_policy_namespace,
335                                        namespace_list)->name);
336         tomoyo_set_space(head);
337 }
338
339 /**
340  * tomoyo_print_name_union - Print a tomoyo_name_union.
341  *
342  * @head: Pointer to "struct tomoyo_io_buffer".
343  * @ptr:  Pointer to "struct tomoyo_name_union".
344  */
345 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
346                                     const struct tomoyo_name_union *ptr)
347 {
348         tomoyo_set_space(head);
349         if (ptr->group) {
350                 tomoyo_set_string(head, "@");
351                 tomoyo_set_string(head, ptr->group->group_name->name);
352         } else {
353                 tomoyo_set_string(head, ptr->filename->name);
354         }
355 }
356
357 /**
358  * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
359  *
360  * @head: Pointer to "struct tomoyo_io_buffer".
361  * @ptr:  Pointer to "struct tomoyo_name_union".
362  *
363  * Returns nothing.
364  */
365 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
366                                            const struct tomoyo_name_union *ptr)
367 {
368         if (ptr->group) {
369                 tomoyo_set_string(head, "@");
370                 tomoyo_set_string(head, ptr->group->group_name->name);
371         } else {
372                 tomoyo_set_string(head, "\"");
373                 tomoyo_set_string(head, ptr->filename->name);
374                 tomoyo_set_string(head, "\"");
375         }
376 }
377
378 /**
379  * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
380  *
381  * @head: Pointer to "struct tomoyo_io_buffer".
382  * @ptr:  Pointer to "struct tomoyo_number_union".
383  *
384  * Returns nothing.
385  */
386 static void tomoyo_print_number_union_nospace
387 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
388 {
389         if (ptr->group) {
390                 tomoyo_set_string(head, "@");
391                 tomoyo_set_string(head, ptr->group->group_name->name);
392         } else {
393                 int i;
394                 unsigned long min = ptr->values[0];
395                 const unsigned long max = ptr->values[1];
396                 u8 min_type = ptr->value_type[0];
397                 const u8 max_type = ptr->value_type[1];
398                 char buffer[128];
399                 buffer[0] = '\0';
400                 for (i = 0; i < 2; i++) {
401                         switch (min_type) {
402                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
403                                 tomoyo_addprintf(buffer, sizeof(buffer),
404                                                  "0x%lX", min);
405                                 break;
406                         case TOMOYO_VALUE_TYPE_OCTAL:
407                                 tomoyo_addprintf(buffer, sizeof(buffer),
408                                                  "0%lo", min);
409                                 break;
410                         default:
411                                 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
412                                                  min);
413                                 break;
414                         }
415                         if (min == max && min_type == max_type)
416                                 break;
417                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
418                         min_type = max_type;
419                         min = max;
420                 }
421                 tomoyo_io_printf(head, "%s", buffer);
422         }
423 }
424
425 /**
426  * tomoyo_print_number_union - Print a tomoyo_number_union.
427  *
428  * @head: Pointer to "struct tomoyo_io_buffer".
429  * @ptr:  Pointer to "struct tomoyo_number_union".
430  *
431  * Returns nothing.
432  */
433 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
434                                       const struct tomoyo_number_union *ptr)
435 {
436         tomoyo_set_space(head);
437         tomoyo_print_number_union_nospace(head, ptr);
438 }
439
440 /**
441  * tomoyo_assign_profile - Create a new profile.
442  *
443  * @ns:      Pointer to "struct tomoyo_policy_namespace".
444  * @profile: Profile number to create.
445  *
446  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
447  */
448 static struct tomoyo_profile *tomoyo_assign_profile
449 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
450 {
451         struct tomoyo_profile *ptr;
452         struct tomoyo_profile *entry;
453         if (profile >= TOMOYO_MAX_PROFILES)
454                 return NULL;
455         ptr = ns->profile_ptr[profile];
456         if (ptr)
457                 return ptr;
458         entry = kzalloc(sizeof(*entry), GFP_NOFS);
459         if (mutex_lock_interruptible(&tomoyo_policy_lock))
460                 goto out;
461         ptr = ns->profile_ptr[profile];
462         if (!ptr && tomoyo_memory_ok(entry)) {
463                 ptr = entry;
464                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
465                         TOMOYO_CONFIG_WANT_GRANT_LOG |
466                         TOMOYO_CONFIG_WANT_REJECT_LOG;
467                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
468                        sizeof(ptr->config));
469                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 1024;
470                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 2048;
471                 mb(); /* Avoid out-of-order execution. */
472                 ns->profile_ptr[profile] = ptr;
473                 entry = NULL;
474         }
475         mutex_unlock(&tomoyo_policy_lock);
476  out:
477         kfree(entry);
478         return ptr;
479 }
480
481 /**
482  * tomoyo_profile - Find a profile.
483  *
484  * @ns:      Pointer to "struct tomoyo_policy_namespace".
485  * @profile: Profile number to find.
486  *
487  * Returns pointer to "struct tomoyo_profile".
488  */
489 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
490                                       const u8 profile)
491 {
492         static struct tomoyo_profile tomoyo_null_profile;
493         struct tomoyo_profile *ptr = ns->profile_ptr[profile];
494         if (!ptr)
495                 ptr = &tomoyo_null_profile;
496         return ptr;
497 }
498
499 /**
500  * tomoyo_find_yesno - Find values for specified keyword.
501  *
502  * @string: String to check.
503  * @find:   Name of keyword.
504  *
505  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
506  */
507 static s8 tomoyo_find_yesno(const char *string, const char *find)
508 {
509         const char *cp = strstr(string, find);
510         if (cp) {
511                 cp += strlen(find);
512                 if (!strncmp(cp, "=yes", 4))
513                         return 1;
514                 else if (!strncmp(cp, "=no", 3))
515                         return 0;
516         }
517         return -1;
518 }
519
520 /**
521  * tomoyo_set_uint - Set value for specified preference.
522  *
523  * @i:      Pointer to "unsigned int".
524  * @string: String to check.
525  * @find:   Name of keyword.
526  *
527  * Returns nothing.
528  */
529 static void tomoyo_set_uint(unsigned int *i, const char *string,
530                             const char *find)
531 {
532         const char *cp = strstr(string, find);
533         if (cp)
534                 sscanf(cp + strlen(find), "=%u", i);
535 }
536
537 /**
538  * tomoyo_set_mode - Set mode for specified profile.
539  *
540  * @name:    Name of functionality.
541  * @value:   Mode for @name.
542  * @profile: Pointer to "struct tomoyo_profile".
543  *
544  * Returns 0 on success, negative value otherwise.
545  */
546 static int tomoyo_set_mode(char *name, const char *value,
547                            struct tomoyo_profile *profile)
548 {
549         u8 i;
550         u8 config;
551         if (!strcmp(name, "CONFIG")) {
552                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
553                 config = profile->default_config;
554         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
555                 config = 0;
556                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
557                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
558                         int len = 0;
559                         if (i < TOMOYO_MAX_MAC_INDEX) {
560                                 const u8 c = tomoyo_index2category[i];
561                                 const char *category =
562                                         tomoyo_category_keywords[c];
563                                 len = strlen(category);
564                                 if (strncmp(name, category, len) ||
565                                     name[len++] != ':' || name[len++] != ':')
566                                         continue;
567                         }
568                         if (strcmp(name + len, tomoyo_mac_keywords[i]))
569                                 continue;
570                         config = profile->config[i];
571                         break;
572                 }
573                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
574                         return -EINVAL;
575         } else {
576                 return -EINVAL;
577         }
578         if (strstr(value, "use_default")) {
579                 config = TOMOYO_CONFIG_USE_DEFAULT;
580         } else {
581                 u8 mode;
582                 for (mode = 0; mode < 4; mode++)
583                         if (strstr(value, tomoyo_mode[mode]))
584                                 /*
585                                  * Update lower 3 bits in order to distinguish
586                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
587                                  */
588                                 config = (config & ~7) | mode;
589                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
590                         switch (tomoyo_find_yesno(value, "grant_log")) {
591                         case 1:
592                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
593                                 break;
594                         case 0:
595                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
596                                 break;
597                         }
598                         switch (tomoyo_find_yesno(value, "reject_log")) {
599                         case 1:
600                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
601                                 break;
602                         case 0:
603                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
604                                 break;
605                         }
606                 }
607         }
608         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
609                 profile->config[i] = config;
610         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
611                 profile->default_config = config;
612         return 0;
613 }
614
615 /**
616  * tomoyo_write_profile - Write profile table.
617  *
618  * @head: Pointer to "struct tomoyo_io_buffer".
619  *
620  * Returns 0 on success, negative value otherwise.
621  */
622 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
623 {
624         char *data = head->write_buf;
625         unsigned int i;
626         char *cp;
627         struct tomoyo_profile *profile;
628         if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
629             == 1)
630                 return 0;
631         i = simple_strtoul(data, &cp, 10);
632         if (*cp != '-')
633                 return -EINVAL;
634         data = cp + 1;
635         profile = tomoyo_assign_profile(head->w.ns, i);
636         if (!profile)
637                 return -EINVAL;
638         cp = strchr(data, '=');
639         if (!cp)
640                 return -EINVAL;
641         *cp++ = '\0';
642         if (!strcmp(data, "COMMENT")) {
643                 static DEFINE_SPINLOCK(lock);
644                 const struct tomoyo_path_info *new_comment
645                         = tomoyo_get_name(cp);
646                 const struct tomoyo_path_info *old_comment;
647                 if (!new_comment)
648                         return -ENOMEM;
649                 spin_lock(&lock);
650                 old_comment = profile->comment;
651                 profile->comment = new_comment;
652                 spin_unlock(&lock);
653                 tomoyo_put_name(old_comment);
654                 return 0;
655         }
656         if (!strcmp(data, "PREFERENCE")) {
657                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
658                         tomoyo_set_uint(&profile->pref[i], cp,
659                                         tomoyo_pref_keywords[i]);
660                 return 0;
661         }
662         return tomoyo_set_mode(data, cp, profile);
663 }
664
665 /**
666  * tomoyo_print_config - Print mode for specified functionality.
667  *
668  * @head:   Pointer to "struct tomoyo_io_buffer".
669  * @config: Mode for that functionality.
670  *
671  * Returns nothing.
672  *
673  * Caller prints functionality's name.
674  */
675 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
676 {
677         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
678                          tomoyo_mode[config & 3],
679                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
680                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
681 }
682
683 /**
684  * tomoyo_read_profile - Read profile table.
685  *
686  * @head: Pointer to "struct tomoyo_io_buffer".
687  *
688  * Returns nothing.
689  */
690 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
691 {
692         u8 index;
693         struct tomoyo_policy_namespace *ns =
694                 container_of(head->r.ns, typeof(*ns), namespace_list);
695         const struct tomoyo_profile *profile;
696         if (head->r.eof)
697                 return;
698  next:
699         index = head->r.index;
700         profile = ns->profile_ptr[index];
701         switch (head->r.step) {
702         case 0:
703                 tomoyo_print_namespace(head);
704                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
705                                  ns->profile_version);
706                 head->r.step++;
707                 break;
708         case 1:
709                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
710                       head->r.index++)
711                         if (ns->profile_ptr[head->r.index])
712                                 break;
713                 if (head->r.index == TOMOYO_MAX_PROFILES)
714                         return;
715                 head->r.step++;
716                 break;
717         case 2:
718                 {
719                         u8 i;
720                         const struct tomoyo_path_info *comment =
721                                 profile->comment;
722                         tomoyo_print_namespace(head);
723                         tomoyo_io_printf(head, "%u-COMMENT=", index);
724                         tomoyo_set_string(head, comment ? comment->name : "");
725                         tomoyo_set_lf(head);
726                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
727                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
728                                 tomoyo_io_printf(head, "%s=%u ",
729                                                  tomoyo_pref_keywords[i],
730                                                  profile->pref[i]);
731                         tomoyo_set_string(head, "}\n");
732                         head->r.step++;
733                 }
734                 break;
735         case 3:
736                 {
737                         tomoyo_print_namespace(head);
738                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
739                         tomoyo_print_config(head, profile->default_config);
740                         head->r.bit = 0;
741                         head->r.step++;
742                 }
743                 break;
744         case 4:
745                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
746                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
747                         const u8 i = head->r.bit;
748                         const u8 config = profile->config[i];
749                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
750                                 continue;
751                         tomoyo_print_namespace(head);
752                         if (i < TOMOYO_MAX_MAC_INDEX)
753                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
754                                                  index,
755                                                  tomoyo_category_keywords
756                                                  [tomoyo_index2category[i]],
757                                                  tomoyo_mac_keywords[i]);
758                         else
759                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
760                                                  tomoyo_mac_keywords[i]);
761                         tomoyo_print_config(head, config);
762                         head->r.bit++;
763                         break;
764                 }
765                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
766                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
767                         head->r.index++;
768                         head->r.step = 1;
769                 }
770                 break;
771         }
772         if (tomoyo_flush(head))
773                 goto next;
774 }
775
776 /**
777  * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
778  *
779  * @a: Pointer to "struct tomoyo_acl_head".
780  * @b: Pointer to "struct tomoyo_acl_head".
781  *
782  * Returns true if @a == @b, false otherwise.
783  */
784 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
785                                 const struct tomoyo_acl_head *b)
786 {
787         return container_of(a, struct tomoyo_manager, head)->manager ==
788                 container_of(b, struct tomoyo_manager, head)->manager;
789 }
790
791 /**
792  * tomoyo_update_manager_entry - Add a manager entry.
793  *
794  * @manager:   The path to manager or the domainnamme.
795  * @is_delete: True if it is a delete request.
796  *
797  * Returns 0 on success, negative value otherwise.
798  *
799  * Caller holds tomoyo_read_lock().
800  */
801 static int tomoyo_update_manager_entry(const char *manager,
802                                        const bool is_delete)
803 {
804         struct tomoyo_manager e = { };
805         struct tomoyo_acl_param param = {
806                 /* .ns = &tomoyo_kernel_namespace, */
807                 .is_delete = is_delete,
808                 .list = &tomoyo_kernel_namespace.
809                 policy_list[TOMOYO_ID_MANAGER],
810         };
811         int error = is_delete ? -ENOENT : -ENOMEM;
812         if (tomoyo_domain_def(manager)) {
813                 if (!tomoyo_correct_domain(manager))
814                         return -EINVAL;
815                 e.is_domain = true;
816         } else {
817                 if (!tomoyo_correct_path(manager))
818                         return -EINVAL;
819         }
820         e.manager = tomoyo_get_name(manager);
821         if (e.manager) {
822                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
823                                              tomoyo_same_manager);
824                 tomoyo_put_name(e.manager);
825         }
826         return error;
827 }
828
829 /**
830  * tomoyo_write_manager - Write manager policy.
831  *
832  * @head: Pointer to "struct tomoyo_io_buffer".
833  *
834  * Returns 0 on success, negative value otherwise.
835  *
836  * Caller holds tomoyo_read_lock().
837  */
838 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
839 {
840         char *data = head->write_buf;
841
842         if (!strcmp(data, "manage_by_non_root")) {
843                 tomoyo_manage_by_non_root = !head->w.is_delete;
844                 return 0;
845         }
846         return tomoyo_update_manager_entry(data, head->w.is_delete);
847 }
848
849 /**
850  * tomoyo_read_manager - Read manager policy.
851  *
852  * @head: Pointer to "struct tomoyo_io_buffer".
853  *
854  * Caller holds tomoyo_read_lock().
855  */
856 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
857 {
858         if (head->r.eof)
859                 return;
860         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
861                              policy_list[TOMOYO_ID_MANAGER]) {
862                 struct tomoyo_manager *ptr =
863                         list_entry(head->r.acl, typeof(*ptr), head.list);
864                 if (ptr->head.is_deleted)
865                         continue;
866                 if (!tomoyo_flush(head))
867                         return;
868                 tomoyo_set_string(head, ptr->manager->name);
869                 tomoyo_set_lf(head);
870         }
871         head->r.eof = true;
872 }
873
874 /**
875  * tomoyo_manager - Check whether the current process is a policy manager.
876  *
877  * Returns true if the current process is permitted to modify policy
878  * via /sys/kernel/security/tomoyo/ interface.
879  *
880  * Caller holds tomoyo_read_lock().
881  */
882 static bool tomoyo_manager(void)
883 {
884         struct tomoyo_manager *ptr;
885         const char *exe;
886         const struct task_struct *task = current;
887         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
888         bool found = false;
889
890         if (!tomoyo_policy_loaded)
891                 return true;
892         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
893                 return false;
894         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
895                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
896                 if (!ptr->head.is_deleted && ptr->is_domain
897                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
898                         found = true;
899                         break;
900                 }
901         }
902         if (found)
903                 return true;
904         exe = tomoyo_get_exe();
905         if (!exe)
906                 return false;
907         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
908                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
909                 if (!ptr->head.is_deleted && !ptr->is_domain
910                     && !strcmp(exe, ptr->manager->name)) {
911                         found = true;
912                         break;
913                 }
914         }
915         if (!found) { /* Reduce error messages. */
916                 static pid_t last_pid;
917                 const pid_t pid = current->pid;
918                 if (last_pid != pid) {
919                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
920                                "update policies.\n", domainname->name, exe);
921                         last_pid = pid;
922                 }
923         }
924         kfree(exe);
925         return found;
926 }
927
928 /**
929  * tomoyo_select_domain - Parse select command.
930  *
931  * @head: Pointer to "struct tomoyo_io_buffer".
932  * @data: String to parse.
933  *
934  * Returns true on success, false otherwise.
935  *
936  * Caller holds tomoyo_read_lock().
937  */
938 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
939                                  const char *data)
940 {
941         unsigned int pid;
942         struct tomoyo_domain_info *domain = NULL;
943         bool global_pid = false;
944         if (strncmp(data, "select ", 7))
945                 return false;
946         data += 7;
947         if (sscanf(data, "pid=%u", &pid) == 1 ||
948             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
949                 struct task_struct *p;
950                 rcu_read_lock();
951                 read_lock(&tasklist_lock);
952                 if (global_pid)
953                         p = find_task_by_pid_ns(pid, &init_pid_ns);
954                 else
955                         p = find_task_by_vpid(pid);
956                 if (p)
957                         domain = tomoyo_real_domain(p);
958                 read_unlock(&tasklist_lock);
959                 rcu_read_unlock();
960         } else if (!strncmp(data, "domain=", 7)) {
961                 if (tomoyo_domain_def(data + 7))
962                         domain = tomoyo_find_domain(data + 7);
963         } else
964                 return false;
965         head->w.domain = domain;
966         /* Accessing read_buf is safe because head->io_sem is held. */
967         if (!head->read_buf)
968                 return true; /* Do nothing if open(O_WRONLY). */
969         memset(&head->r, 0, sizeof(head->r));
970         head->r.print_this_domain_only = true;
971         if (domain)
972                 head->r.domain = &domain->list;
973         else
974                 head->r.eof = 1;
975         tomoyo_io_printf(head, "# select %s\n", data);
976         if (domain && domain->is_deleted)
977                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
978         return true;
979 }
980
981 /**
982  * tomoyo_delete_domain - Delete a domain.
983  *
984  * @domainname: The name of domain.
985  *
986  * Returns 0.
987  *
988  * Caller holds tomoyo_read_lock().
989  */
990 static int tomoyo_delete_domain(char *domainname)
991 {
992         struct tomoyo_domain_info *domain;
993         struct tomoyo_path_info name;
994
995         name.name = domainname;
996         tomoyo_fill_path_info(&name);
997         if (mutex_lock_interruptible(&tomoyo_policy_lock))
998                 return 0;
999         /* Is there an active domain? */
1000         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1001                 /* Never delete tomoyo_kernel_domain */
1002                 if (domain == &tomoyo_kernel_domain)
1003                         continue;
1004                 if (domain->is_deleted ||
1005                     tomoyo_pathcmp(domain->domainname, &name))
1006                         continue;
1007                 domain->is_deleted = true;
1008                 break;
1009         }
1010         mutex_unlock(&tomoyo_policy_lock);
1011         return 0;
1012 }
1013
1014 /**
1015  * tomoyo_write_domain2 - Write domain policy.
1016  *
1017  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1018  * @list:      Pointer to "struct list_head".
1019  * @data:      Policy to be interpreted.
1020  * @is_delete: True if it is a delete request.
1021  *
1022  * Returns 0 on success, negative value otherwise.
1023  *
1024  * Caller holds tomoyo_read_lock().
1025  */
1026 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1027                                 struct list_head *list, char *data,
1028                                 const bool is_delete)
1029 {
1030         struct tomoyo_acl_param param = {
1031                 .ns = ns,
1032                 .list = list,
1033                 .data = data,
1034                 .is_delete = is_delete,
1035         };
1036         static const struct {
1037                 const char *keyword;
1038                 int (*write) (struct tomoyo_acl_param *);
1039         } tomoyo_callback[1] = {
1040                 { "file ", tomoyo_write_file },
1041         };
1042         u8 i;
1043         for (i = 0; i < 1; i++) {
1044                 if (!tomoyo_str_starts(&param.data,
1045                                        tomoyo_callback[i].keyword))
1046                         continue;
1047                 return tomoyo_callback[i].write(&param);
1048         }
1049         return -EINVAL;
1050 }
1051
1052 /* String table for domain flags. */
1053 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1054         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1055         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1056 };
1057
1058 /**
1059  * tomoyo_write_domain - Write domain policy.
1060  *
1061  * @head: Pointer to "struct tomoyo_io_buffer".
1062  *
1063  * Returns 0 on success, negative value otherwise.
1064  *
1065  * Caller holds tomoyo_read_lock().
1066  */
1067 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1068 {
1069         char *data = head->write_buf;
1070         struct tomoyo_policy_namespace *ns;
1071         struct tomoyo_domain_info *domain = head->w.domain;
1072         const bool is_delete = head->w.is_delete;
1073         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1074         unsigned int profile;
1075         if (*data == '<') {
1076                 domain = NULL;
1077                 if (is_delete)
1078                         tomoyo_delete_domain(data);
1079                 else if (is_select)
1080                         domain = tomoyo_find_domain(data);
1081                 else
1082                         domain = tomoyo_assign_domain(data, false);
1083                 head->w.domain = domain;
1084                 return 0;
1085         }
1086         if (!domain)
1087                 return -EINVAL;
1088         ns = domain->ns;
1089         if (sscanf(data, "use_profile %u", &profile) == 1
1090             && profile < TOMOYO_MAX_PROFILES) {
1091                 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1092                         domain->profile = (u8) profile;
1093                 return 0;
1094         }
1095         if (sscanf(data, "use_group %u\n", &profile) == 1
1096             && profile < TOMOYO_MAX_ACL_GROUPS) {
1097                 if (!is_delete)
1098                         domain->group = (u8) profile;
1099                 return 0;
1100         }
1101         for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1102                 const char *cp = tomoyo_dif[profile];
1103                 if (strncmp(data, cp, strlen(cp) - 1))
1104                         continue;
1105                 domain->flags[profile] = !is_delete;
1106                 return 0;
1107         }
1108         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1109                                     is_delete);
1110 }
1111
1112 /**
1113  * tomoyo_print_condition - Print condition part.
1114  *
1115  * @head: Pointer to "struct tomoyo_io_buffer".
1116  * @cond: Pointer to "struct tomoyo_condition".
1117  *
1118  * Returns true on success, false otherwise.
1119  */
1120 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1121                                    const struct tomoyo_condition *cond)
1122 {
1123         switch (head->r.cond_step) {
1124         case 0:
1125                 head->r.cond_index = 0;
1126                 head->r.cond_step++;
1127                 /* fall through */
1128         case 1:
1129                 {
1130                         const u16 condc = cond->condc;
1131                         const struct tomoyo_condition_element *condp =
1132                                 (typeof(condp)) (cond + 1);
1133                         const struct tomoyo_number_union *numbers_p =
1134                                 (typeof(numbers_p)) (condp + condc);
1135                         const struct tomoyo_name_union *names_p =
1136                                 (typeof(names_p))
1137                                 (numbers_p + cond->numbers_count);
1138                         const struct tomoyo_argv *argv =
1139                                 (typeof(argv)) (names_p + cond->names_count);
1140                         const struct tomoyo_envp *envp =
1141                                 (typeof(envp)) (argv + cond->argc);
1142                         u16 skip;
1143                         for (skip = 0; skip < head->r.cond_index; skip++) {
1144                                 const u8 left = condp->left;
1145                                 const u8 right = condp->right;
1146                                 condp++;
1147                                 switch (left) {
1148                                 case TOMOYO_ARGV_ENTRY:
1149                                         argv++;
1150                                         continue;
1151                                 case TOMOYO_ENVP_ENTRY:
1152                                         envp++;
1153                                         continue;
1154                                 case TOMOYO_NUMBER_UNION:
1155                                         numbers_p++;
1156                                         break;
1157                                 }
1158                                 switch (right) {
1159                                 case TOMOYO_NAME_UNION:
1160                                         names_p++;
1161                                         break;
1162                                 case TOMOYO_NUMBER_UNION:
1163                                         numbers_p++;
1164                                         break;
1165                                 }
1166                         }
1167                         while (head->r.cond_index < condc) {
1168                                 const u8 match = condp->equals;
1169                                 const u8 left = condp->left;
1170                                 const u8 right = condp->right;
1171                                 if (!tomoyo_flush(head))
1172                                         return false;
1173                                 condp++;
1174                                 head->r.cond_index++;
1175                                 tomoyo_set_space(head);
1176                                 switch (left) {
1177                                 case TOMOYO_ARGV_ENTRY:
1178                                         tomoyo_io_printf(head,
1179                                                          "exec.argv[%lu]%s=\"",
1180                                                          argv->index, argv->
1181                                                          is_not ? "!" : "");
1182                                         tomoyo_set_string(head,
1183                                                           argv->value->name);
1184                                         tomoyo_set_string(head, "\"");
1185                                         argv++;
1186                                         continue;
1187                                 case TOMOYO_ENVP_ENTRY:
1188                                         tomoyo_set_string(head,
1189                                                           "exec.envp[\"");
1190                                         tomoyo_set_string(head,
1191                                                           envp->name->name);
1192                                         tomoyo_io_printf(head, "\"]%s=", envp->
1193                                                          is_not ? "!" : "");
1194                                         if (envp->value) {
1195                                                 tomoyo_set_string(head, "\"");
1196                                                 tomoyo_set_string(head, envp->
1197                                                                   value->name);
1198                                                 tomoyo_set_string(head, "\"");
1199                                         } else {
1200                                                 tomoyo_set_string(head,
1201                                                                   "NULL");
1202                                         }
1203                                         envp++;
1204                                         continue;
1205                                 case TOMOYO_NUMBER_UNION:
1206                                         tomoyo_print_number_union_nospace
1207                                                 (head, numbers_p++);
1208                                         break;
1209                                 default:
1210                                         tomoyo_set_string(head,
1211                                                tomoyo_condition_keyword[left]);
1212                                         break;
1213                                 }
1214                                 tomoyo_set_string(head, match ? "=" : "!=");
1215                                 switch (right) {
1216                                 case TOMOYO_NAME_UNION:
1217                                         tomoyo_print_name_union_quoted
1218                                                 (head, names_p++);
1219                                         break;
1220                                 case TOMOYO_NUMBER_UNION:
1221                                         tomoyo_print_number_union_nospace
1222                                                 (head, numbers_p++);
1223                                         break;
1224                                 default:
1225                                         tomoyo_set_string(head,
1226                                           tomoyo_condition_keyword[right]);
1227                                         break;
1228                                 }
1229                         }
1230                 }
1231                 head->r.cond_step++;
1232                 /* fall through */
1233         case 2:
1234                 if (!tomoyo_flush(head))
1235                         break;
1236                 head->r.cond_step++;
1237                 /* fall through */
1238         case 3:
1239                 tomoyo_set_lf(head);
1240                 return true;
1241         }
1242         return false;
1243 }
1244
1245 /**
1246  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1247  *
1248  * @head:     Pointer to "struct tomoyo_io_buffer".
1249  * @category: Category name.
1250  *
1251  * Returns nothing.
1252  */
1253 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1254                              const char *category)
1255 {
1256         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1257                 tomoyo_print_namespace(head);
1258                 tomoyo_io_printf(head, "acl_group %u ",
1259                                  head->r.acl_group_index);
1260         }
1261         tomoyo_set_string(head, category);
1262 }
1263
1264 /**
1265  * tomoyo_print_entry - Print an ACL entry.
1266  *
1267  * @head: Pointer to "struct tomoyo_io_buffer".
1268  * @acl:  Pointer to an ACL entry.
1269  *
1270  * Returns true on success, false otherwise.
1271  */
1272 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1273                                struct tomoyo_acl_info *acl)
1274 {
1275         const u8 acl_type = acl->type;
1276         bool first = true;
1277         u8 bit;
1278
1279         if (head->r.print_cond_part)
1280                 goto print_cond_part;
1281         if (acl->is_deleted)
1282                 return true;
1283         if (!tomoyo_flush(head))
1284                 return false;
1285         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1286                 struct tomoyo_path_acl *ptr =
1287                         container_of(acl, typeof(*ptr), head);
1288                 const u16 perm = ptr->perm;
1289                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1290                         if (!(perm & (1 << bit)))
1291                                 continue;
1292                         if (head->r.print_transition_related_only &&
1293                             bit != TOMOYO_TYPE_EXECUTE)
1294                                 continue;
1295                         if (first) {
1296                                 tomoyo_set_group(head, "file ");
1297                                 first = false;
1298                         } else {
1299                                 tomoyo_set_slash(head);
1300                         }
1301                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1302                 }
1303                 if (first)
1304                         return true;
1305                 tomoyo_print_name_union(head, &ptr->name);
1306         } else if (head->r.print_transition_related_only) {
1307                 return true;
1308         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1309                 struct tomoyo_path2_acl *ptr =
1310                         container_of(acl, typeof(*ptr), head);
1311                 const u8 perm = ptr->perm;
1312                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1313                         if (!(perm & (1 << bit)))
1314                                 continue;
1315                         if (first) {
1316                                 tomoyo_set_group(head, "file ");
1317                                 first = false;
1318                         } else {
1319                                 tomoyo_set_slash(head);
1320                         }
1321                         tomoyo_set_string(head, tomoyo_mac_keywords
1322                                           [tomoyo_pp2mac[bit]]);
1323                 }
1324                 if (first)
1325                         return true;
1326                 tomoyo_print_name_union(head, &ptr->name1);
1327                 tomoyo_print_name_union(head, &ptr->name2);
1328         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1329                 struct tomoyo_path_number_acl *ptr =
1330                         container_of(acl, typeof(*ptr), head);
1331                 const u8 perm = ptr->perm;
1332                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1333                         if (!(perm & (1 << bit)))
1334                                 continue;
1335                         if (first) {
1336                                 tomoyo_set_group(head, "file ");
1337                                 first = false;
1338                         } else {
1339                                 tomoyo_set_slash(head);
1340                         }
1341                         tomoyo_set_string(head, tomoyo_mac_keywords
1342                                           [tomoyo_pn2mac[bit]]);
1343                 }
1344                 if (first)
1345                         return true;
1346                 tomoyo_print_name_union(head, &ptr->name);
1347                 tomoyo_print_number_union(head, &ptr->number);
1348         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1349                 struct tomoyo_mkdev_acl *ptr =
1350                         container_of(acl, typeof(*ptr), head);
1351                 const u8 perm = ptr->perm;
1352                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1353                         if (!(perm & (1 << bit)))
1354                                 continue;
1355                         if (first) {
1356                                 tomoyo_set_group(head, "file ");
1357                                 first = false;
1358                         } else {
1359                                 tomoyo_set_slash(head);
1360                         }
1361                         tomoyo_set_string(head, tomoyo_mac_keywords
1362                                           [tomoyo_pnnn2mac[bit]]);
1363                 }
1364                 if (first)
1365                         return true;
1366                 tomoyo_print_name_union(head, &ptr->name);
1367                 tomoyo_print_number_union(head, &ptr->mode);
1368                 tomoyo_print_number_union(head, &ptr->major);
1369                 tomoyo_print_number_union(head, &ptr->minor);
1370         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1371                 struct tomoyo_mount_acl *ptr =
1372                         container_of(acl, typeof(*ptr), head);
1373                 tomoyo_set_group(head, "file mount");
1374                 tomoyo_print_name_union(head, &ptr->dev_name);
1375                 tomoyo_print_name_union(head, &ptr->dir_name);
1376                 tomoyo_print_name_union(head, &ptr->fs_type);
1377                 tomoyo_print_number_union(head, &ptr->flags);
1378         }
1379         if (acl->cond) {
1380                 head->r.print_cond_part = true;
1381                 head->r.cond_step = 0;
1382                 if (!tomoyo_flush(head))
1383                         return false;
1384 print_cond_part:
1385                 if (!tomoyo_print_condition(head, acl->cond))
1386                         return false;
1387                 head->r.print_cond_part = false;
1388         } else {
1389                 tomoyo_set_lf(head);
1390         }
1391         return true;
1392 }
1393
1394 /**
1395  * tomoyo_read_domain2 - Read domain policy.
1396  *
1397  * @head: Pointer to "struct tomoyo_io_buffer".
1398  * @list: Pointer to "struct list_head".
1399  *
1400  * Caller holds tomoyo_read_lock().
1401  *
1402  * Returns true on success, false otherwise.
1403  */
1404 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1405                                 struct list_head *list)
1406 {
1407         list_for_each_cookie(head->r.acl, list) {
1408                 struct tomoyo_acl_info *ptr =
1409                         list_entry(head->r.acl, typeof(*ptr), list);
1410                 if (!tomoyo_print_entry(head, ptr))
1411                         return false;
1412         }
1413         head->r.acl = NULL;
1414         return true;
1415 }
1416
1417 /**
1418  * tomoyo_read_domain - Read domain policy.
1419  *
1420  * @head: Pointer to "struct tomoyo_io_buffer".
1421  *
1422  * Caller holds tomoyo_read_lock().
1423  */
1424 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1425 {
1426         if (head->r.eof)
1427                 return;
1428         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1429                 struct tomoyo_domain_info *domain =
1430                         list_entry(head->r.domain, typeof(*domain), list);
1431                 switch (head->r.step) {
1432                         u8 i;
1433                 case 0:
1434                         if (domain->is_deleted &&
1435                             !head->r.print_this_domain_only)
1436                                 continue;
1437                         /* Print domainname and flags. */
1438                         tomoyo_set_string(head, domain->domainname->name);
1439                         tomoyo_set_lf(head);
1440                         tomoyo_io_printf(head, "use_profile %u\n",
1441                                          domain->profile);
1442                         tomoyo_io_printf(head, "use_group %u\n",
1443                                          domain->group);
1444                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1445                                 if (domain->flags[i])
1446                                         tomoyo_set_string(head, tomoyo_dif[i]);
1447                         head->r.step++;
1448                         tomoyo_set_lf(head);
1449                         /* fall through */
1450                 case 1:
1451                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1452                                 return;
1453                         head->r.step++;
1454                         if (!tomoyo_set_lf(head))
1455                                 return;
1456                         /* fall through */
1457                 case 2:
1458                         head->r.step = 0;
1459                         if (head->r.print_this_domain_only)
1460                                 goto done;
1461                 }
1462         }
1463  done:
1464         head->r.eof = true;
1465 }
1466
1467 /**
1468  * tomoyo_write_pid: Specify PID to obtain domainname.
1469  *
1470  * @head: Pointer to "struct tomoyo_io_buffer".
1471  *
1472  * Returns 0.
1473  */
1474 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1475 {
1476         head->r.eof = false;
1477         return 0;
1478 }
1479
1480 /**
1481  * tomoyo_read_pid - Get domainname of the specified PID.
1482  *
1483  * @head: Pointer to "struct tomoyo_io_buffer".
1484  *
1485  * Returns the domainname which the specified PID is in on success,
1486  * empty string otherwise.
1487  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1488  * using read()/write() interface rather than sysctl() interface.
1489  */
1490 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1491 {
1492         char *buf = head->write_buf;
1493         bool global_pid = false;
1494         unsigned int pid;
1495         struct task_struct *p;
1496         struct tomoyo_domain_info *domain = NULL;
1497
1498         /* Accessing write_buf is safe because head->io_sem is held. */
1499         if (!buf) {
1500                 head->r.eof = true;
1501                 return; /* Do nothing if open(O_RDONLY). */
1502         }
1503         if (head->r.w_pos || head->r.eof)
1504                 return;
1505         head->r.eof = true;
1506         if (tomoyo_str_starts(&buf, "global-pid "))
1507                 global_pid = true;
1508         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1509         rcu_read_lock();
1510         read_lock(&tasklist_lock);
1511         if (global_pid)
1512                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1513         else
1514                 p = find_task_by_vpid(pid);
1515         if (p)
1516                 domain = tomoyo_real_domain(p);
1517         read_unlock(&tasklist_lock);
1518         rcu_read_unlock();
1519         if (!domain)
1520                 return;
1521         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1522         tomoyo_set_string(head, domain->domainname->name);
1523 }
1524
1525 /* String table for domain transition control keywords. */
1526 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1527         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1528         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1529         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1530         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1531         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1532         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1533 };
1534
1535 /* String table for grouping keywords. */
1536 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1537         [TOMOYO_PATH_GROUP]   = "path_group ",
1538         [TOMOYO_NUMBER_GROUP] = "number_group ",
1539 };
1540
1541 /**
1542  * tomoyo_write_exception - Write exception policy.
1543  *
1544  * @head: Pointer to "struct tomoyo_io_buffer".
1545  *
1546  * Returns 0 on success, negative value otherwise.
1547  *
1548  * Caller holds tomoyo_read_lock().
1549  */
1550 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1551 {
1552         const bool is_delete = head->w.is_delete;
1553         struct tomoyo_acl_param param = {
1554                 .ns = head->w.ns,
1555                 .is_delete = is_delete,
1556                 .data = head->write_buf,
1557         };
1558         u8 i;
1559         if (tomoyo_str_starts(&param.data, "aggregator "))
1560                 return tomoyo_write_aggregator(&param);
1561         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1562                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1563                         return tomoyo_write_transition_control(&param, i);
1564         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1565                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1566                         return tomoyo_write_group(&param, i);
1567         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1568                 unsigned int group;
1569                 char *data;
1570                 group = simple_strtoul(param.data, &data, 10);
1571                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1572                         return tomoyo_write_domain2
1573                                 (head->w.ns, &head->w.ns->acl_group[group],
1574                                  data, is_delete);
1575         }
1576         return -EINVAL;
1577 }
1578
1579 /**
1580  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1581  *
1582  * @head: Pointer to "struct tomoyo_io_buffer".
1583  * @idx:  Index number.
1584  *
1585  * Returns true on success, false otherwise.
1586  *
1587  * Caller holds tomoyo_read_lock().
1588  */
1589 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1590 {
1591         struct tomoyo_policy_namespace *ns =
1592                 container_of(head->r.ns, typeof(*ns), namespace_list);
1593         struct list_head *list = &ns->group_list[idx];
1594         list_for_each_cookie(head->r.group, list) {
1595                 struct tomoyo_group *group =
1596                         list_entry(head->r.group, typeof(*group), head.list);
1597                 list_for_each_cookie(head->r.acl, &group->member_list) {
1598                         struct tomoyo_acl_head *ptr =
1599                                 list_entry(head->r.acl, typeof(*ptr), list);
1600                         if (ptr->is_deleted)
1601                                 continue;
1602                         if (!tomoyo_flush(head))
1603                                 return false;
1604                         tomoyo_print_namespace(head);
1605                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1606                         tomoyo_set_string(head, group->group_name->name);
1607                         if (idx == TOMOYO_PATH_GROUP) {
1608                                 tomoyo_set_space(head);
1609                                 tomoyo_set_string(head, container_of
1610                                                (ptr, struct tomoyo_path_group,
1611                                                 head)->member_name->name);
1612                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1613                                 tomoyo_print_number_union(head, &container_of
1614                                                           (ptr,
1615                                                    struct tomoyo_number_group,
1616                                                            head)->number);
1617                         }
1618                         tomoyo_set_lf(head);
1619                 }
1620                 head->r.acl = NULL;
1621         }
1622         head->r.group = NULL;
1623         return true;
1624 }
1625
1626 /**
1627  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1628  *
1629  * @head: Pointer to "struct tomoyo_io_buffer".
1630  * @idx:  Index number.
1631  *
1632  * Returns true on success, false otherwise.
1633  *
1634  * Caller holds tomoyo_read_lock().
1635  */
1636 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1637 {
1638         struct tomoyo_policy_namespace *ns =
1639                 container_of(head->r.ns, typeof(*ns), namespace_list);
1640         struct list_head *list = &ns->policy_list[idx];
1641         list_for_each_cookie(head->r.acl, list) {
1642                 struct tomoyo_acl_head *acl =
1643                         container_of(head->r.acl, typeof(*acl), list);
1644                 if (acl->is_deleted)
1645                         continue;
1646                 if (!tomoyo_flush(head))
1647                         return false;
1648                 switch (idx) {
1649                 case TOMOYO_ID_TRANSITION_CONTROL:
1650                         {
1651                                 struct tomoyo_transition_control *ptr =
1652                                         container_of(acl, typeof(*ptr), head);
1653                                 tomoyo_print_namespace(head);
1654                                 tomoyo_set_string(head, tomoyo_transition_type
1655                                                   [ptr->type]);
1656                                 tomoyo_set_string(head, ptr->program ?
1657                                                   ptr->program->name : "any");
1658                                 tomoyo_set_string(head, " from ");
1659                                 tomoyo_set_string(head, ptr->domainname ?
1660                                                   ptr->domainname->name :
1661                                                   "any");
1662                         }
1663                         break;
1664                 case TOMOYO_ID_AGGREGATOR:
1665                         {
1666                                 struct tomoyo_aggregator *ptr =
1667                                         container_of(acl, typeof(*ptr), head);
1668                                 tomoyo_print_namespace(head);
1669                                 tomoyo_set_string(head, "aggregator ");
1670                                 tomoyo_set_string(head,
1671                                                   ptr->original_name->name);
1672                                 tomoyo_set_space(head);
1673                                 tomoyo_set_string(head,
1674                                                ptr->aggregated_name->name);
1675                         }
1676                         break;
1677                 default:
1678                         continue;
1679                 }
1680                 tomoyo_set_lf(head);
1681         }
1682         head->r.acl = NULL;
1683         return true;
1684 }
1685
1686 /**
1687  * tomoyo_read_exception - Read exception policy.
1688  *
1689  * @head: Pointer to "struct tomoyo_io_buffer".
1690  *
1691  * Caller holds tomoyo_read_lock().
1692  */
1693 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1694 {
1695         struct tomoyo_policy_namespace *ns =
1696                 container_of(head->r.ns, typeof(*ns), namespace_list);
1697         if (head->r.eof)
1698                 return;
1699         while (head->r.step < TOMOYO_MAX_POLICY &&
1700                tomoyo_read_policy(head, head->r.step))
1701                 head->r.step++;
1702         if (head->r.step < TOMOYO_MAX_POLICY)
1703                 return;
1704         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1705                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1706                 head->r.step++;
1707         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1708                 return;
1709         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1710                + TOMOYO_MAX_ACL_GROUPS) {
1711                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1712                         - TOMOYO_MAX_GROUP;
1713                 if (!tomoyo_read_domain2(head, &ns->acl_group
1714                                          [head->r.acl_group_index]))
1715                         return;
1716                 head->r.step++;
1717         }
1718         head->r.eof = true;
1719 }
1720
1721 /* Wait queue for kernel -> userspace notification. */
1722 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1723 /* Wait queue for userspace -> kernel notification. */
1724 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1725
1726 /* Structure for query. */
1727 struct tomoyo_query {
1728         struct list_head list;
1729         char *query;
1730         size_t query_len;
1731         unsigned int serial;
1732         u8 timer;
1733         u8 answer;
1734         u8 retry;
1735 };
1736
1737 /* The list for "struct tomoyo_query". */
1738 static LIST_HEAD(tomoyo_query_list);
1739
1740 /* Lock for manipulating tomoyo_query_list. */
1741 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1742
1743 /*
1744  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1745  * interface.
1746  */
1747 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1748
1749 /**
1750  * tomoyo_truncate - Truncate a line.
1751  *
1752  * @str: String to truncate.
1753  *
1754  * Returns length of truncated @str.
1755  */
1756 static int tomoyo_truncate(char *str)
1757 {
1758         char *start = str;
1759         while (*(unsigned char *) str > (unsigned char) ' ')
1760                 str++;
1761         *str = '\0';
1762         return strlen(start) + 1;
1763 }
1764
1765 /**
1766  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1767  *
1768  * @domain: Pointer to "struct tomoyo_domain_info".
1769  * @header: Lines containing ACL.
1770  *
1771  * Returns nothing.
1772  */
1773 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1774 {
1775         char *buffer;
1776         char *realpath = NULL;
1777         char *argv0 = NULL;
1778         char *symlink = NULL;
1779         char *cp = strchr(header, '\n');
1780         int len;
1781         if (!cp)
1782                 return;
1783         cp = strchr(cp + 1, '\n');
1784         if (!cp)
1785                 return;
1786         *cp++ = '\0';
1787         len = strlen(cp) + 1;
1788         /* strstr() will return NULL if ordering is wrong. */
1789         if (*cp == 'f') {
1790                 argv0 = strstr(header, " argv[]={ \"");
1791                 if (argv0) {
1792                         argv0 += 10;
1793                         len += tomoyo_truncate(argv0) + 14;
1794                 }
1795                 realpath = strstr(header, " exec={ realpath=\"");
1796                 if (realpath) {
1797                         realpath += 8;
1798                         len += tomoyo_truncate(realpath) + 6;
1799                 }
1800                 symlink = strstr(header, " symlink.target=\"");
1801                 if (symlink)
1802                         len += tomoyo_truncate(symlink + 1) + 1;
1803         }
1804         buffer = kmalloc(len, GFP_NOFS);
1805         if (!buffer)
1806                 return;
1807         snprintf(buffer, len - 1, "%s", cp);
1808         if (realpath)
1809                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1810         if (argv0)
1811                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1812         if (symlink)
1813                 tomoyo_addprintf(buffer, len, "%s", symlink);
1814         tomoyo_normalize_line(buffer);
1815         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1816                                   false))
1817                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1818         kfree(buffer);
1819 }
1820
1821 /**
1822  * tomoyo_supervisor - Ask for the supervisor's decision.
1823  *
1824  * @r:   Pointer to "struct tomoyo_request_info".
1825  * @fmt: The printf()'s format string, followed by parameters.
1826  *
1827  * Returns 0 if the supervisor decided to permit the access request which
1828  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1829  * supervisor decided to retry the access request which violated the policy in
1830  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1831  */
1832 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1833 {
1834         va_list args;
1835         int error;
1836         int len;
1837         static unsigned int tomoyo_serial;
1838         struct tomoyo_query entry = { };
1839         bool quota_exceeded = false;
1840         va_start(args, fmt);
1841         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
1842         va_end(args);
1843         /* Write /sys/kernel/security/tomoyo/audit. */
1844         va_start(args, fmt);
1845         tomoyo_write_log2(r, len, fmt, args);
1846         va_end(args);
1847         /* Nothing more to do if granted. */
1848         if (r->granted)
1849                 return 0;
1850         if (r->mode)
1851                 tomoyo_update_stat(r->mode);
1852         switch (r->mode) {
1853         case TOMOYO_CONFIG_ENFORCING:
1854                 error = -EPERM;
1855                 if (atomic_read(&tomoyo_query_observers))
1856                         break;
1857                 goto out;
1858         case TOMOYO_CONFIG_LEARNING:
1859                 error = 0;
1860                 /* Check max_learning_entry parameter. */
1861                 if (tomoyo_domain_quota_is_ok(r))
1862                         break;
1863                 /* fall through */
1864         default:
1865                 return 0;
1866         }
1867         /* Get message. */
1868         va_start(args, fmt);
1869         entry.query = tomoyo_init_log(r, len, fmt, args);
1870         va_end(args);
1871         if (!entry.query)
1872                 goto out;
1873         entry.query_len = strlen(entry.query) + 1;
1874         if (!error) {
1875                 tomoyo_add_entry(r->domain, entry.query);
1876                 goto out;
1877         }
1878         len = tomoyo_round2(entry.query_len);
1879         spin_lock(&tomoyo_query_list_lock);
1880         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
1881             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
1882             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
1883                 quota_exceeded = true;
1884         } else {
1885                 entry.serial = tomoyo_serial++;
1886                 entry.retry = r->retry;
1887                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
1888                 list_add_tail(&entry.list, &tomoyo_query_list);
1889         }
1890         spin_unlock(&tomoyo_query_list_lock);
1891         if (quota_exceeded)
1892                 goto out;
1893         /* Give 10 seconds for supervisor's opinion. */
1894         while (entry.timer < 10) {
1895                 wake_up_all(&tomoyo_query_wait);
1896                 if (wait_event_interruptible_timeout
1897                     (tomoyo_answer_wait, entry.answer ||
1898                      !atomic_read(&tomoyo_query_observers), HZ))
1899                         break;
1900                 else
1901                         entry.timer++;
1902         }
1903         spin_lock(&tomoyo_query_list_lock);
1904         list_del(&entry.list);
1905         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
1906         spin_unlock(&tomoyo_query_list_lock);
1907         switch (entry.answer) {
1908         case 3: /* Asked to retry by administrator. */
1909                 error = TOMOYO_RETRY_REQUEST;
1910                 r->retry++;
1911                 break;
1912         case 1:
1913                 /* Granted by administrator. */
1914                 error = 0;
1915                 break;
1916         default:
1917                 /* Timed out or rejected by administrator. */
1918                 break;
1919         }
1920 out:
1921         kfree(entry.query);
1922         return error;
1923 }
1924
1925 /**
1926  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1927  *
1928  * @file: Pointer to "struct file".
1929  * @wait: Pointer to "poll_table".
1930  *
1931  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1932  *
1933  * Waits for access requests which violated policy in enforcing mode.
1934  */
1935 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1936 {
1937         struct list_head *tmp;
1938         bool found = false;
1939         u8 i;
1940         for (i = 0; i < 2; i++) {
1941                 spin_lock(&tomoyo_query_list_lock);
1942                 list_for_each(tmp, &tomoyo_query_list) {
1943                         struct tomoyo_query *ptr =
1944                                 list_entry(tmp, typeof(*ptr), list);
1945                         if (ptr->answer)
1946                                 continue;
1947                         found = true;
1948                         break;
1949                 }
1950                 spin_unlock(&tomoyo_query_list_lock);
1951                 if (found)
1952                         return POLLIN | POLLRDNORM;
1953                 if (i)
1954                         break;
1955                 poll_wait(file, &tomoyo_query_wait, wait);
1956         }
1957         return 0;
1958 }
1959
1960 /**
1961  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1962  *
1963  * @head: Pointer to "struct tomoyo_io_buffer".
1964  */
1965 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1966 {
1967         struct list_head *tmp;
1968         unsigned int pos = 0;
1969         size_t len = 0;
1970         char *buf;
1971         if (head->r.w_pos)
1972                 return;
1973         if (head->read_buf) {
1974                 kfree(head->read_buf);
1975                 head->read_buf = NULL;
1976         }
1977         spin_lock(&tomoyo_query_list_lock);
1978         list_for_each(tmp, &tomoyo_query_list) {
1979                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1980                 if (ptr->answer)
1981                         continue;
1982                 if (pos++ != head->r.query_index)
1983                         continue;
1984                 len = ptr->query_len;
1985                 break;
1986         }
1987         spin_unlock(&tomoyo_query_list_lock);
1988         if (!len) {
1989                 head->r.query_index = 0;
1990                 return;
1991         }
1992         buf = kzalloc(len + 32, GFP_NOFS);
1993         if (!buf)
1994                 return;
1995         pos = 0;
1996         spin_lock(&tomoyo_query_list_lock);
1997         list_for_each(tmp, &tomoyo_query_list) {
1998                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1999                 if (ptr->answer)
2000                         continue;
2001                 if (pos++ != head->r.query_index)
2002                         continue;
2003                 /*
2004                  * Some query can be skipped because tomoyo_query_list
2005                  * can change, but I don't care.
2006                  */
2007                 if (len == ptr->query_len)
2008                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2009                                  ptr->retry, ptr->query);
2010                 break;
2011         }
2012         spin_unlock(&tomoyo_query_list_lock);
2013         if (buf[0]) {
2014                 head->read_buf = buf;
2015                 head->r.w[head->r.w_pos++] = buf;
2016                 head->r.query_index++;
2017         } else {
2018                 kfree(buf);
2019         }
2020 }
2021
2022 /**
2023  * tomoyo_write_answer - Write the supervisor's decision.
2024  *
2025  * @head: Pointer to "struct tomoyo_io_buffer".
2026  *
2027  * Returns 0 on success, -EINVAL otherwise.
2028  */
2029 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2030 {
2031         char *data = head->write_buf;
2032         struct list_head *tmp;
2033         unsigned int serial;
2034         unsigned int answer;
2035         spin_lock(&tomoyo_query_list_lock);
2036         list_for_each(tmp, &tomoyo_query_list) {
2037                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2038                 ptr->timer = 0;
2039         }
2040         spin_unlock(&tomoyo_query_list_lock);
2041         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2042                 return -EINVAL;
2043         spin_lock(&tomoyo_query_list_lock);
2044         list_for_each(tmp, &tomoyo_query_list) {
2045                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2046                 if (ptr->serial != serial)
2047                         continue;
2048                 if (!ptr->answer)
2049                         ptr->answer = answer;
2050                 break;
2051         }
2052         spin_unlock(&tomoyo_query_list_lock);
2053         return 0;
2054 }
2055
2056 /**
2057  * tomoyo_read_version: Get version.
2058  *
2059  * @head: Pointer to "struct tomoyo_io_buffer".
2060  *
2061  * Returns version information.
2062  */
2063 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2064 {
2065         if (!head->r.eof) {
2066                 tomoyo_io_printf(head, "2.4.0");
2067                 head->r.eof = true;
2068         }
2069 }
2070
2071 /**
2072  * tomoyo_read_self_domain - Get the current process's domainname.
2073  *
2074  * @head: Pointer to "struct tomoyo_io_buffer".
2075  *
2076  * Returns the current process's domainname.
2077  */
2078 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
2079 {
2080         if (!head->r.eof) {
2081                 /*
2082                  * tomoyo_domain()->domainname != NULL
2083                  * because every process belongs to a domain and
2084                  * the domain's name cannot be NULL.
2085                  */
2086                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
2087                 head->r.eof = true;
2088         }
2089 }
2090
2091 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2092 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2093         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2094         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2095         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2096         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2097 };
2098
2099 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2100 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2101         [TOMOYO_MEMORY_POLICY] = "policy:",
2102         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2103         [TOMOYO_MEMORY_QUERY]  = "query message:",
2104 };
2105
2106 /* Timestamp counter for last updated. */
2107 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2108 /* Counter for number of updates. */
2109 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2110
2111 /**
2112  * tomoyo_update_stat - Update statistic counters.
2113  *
2114  * @index: Index for policy type.
2115  *
2116  * Returns nothing.
2117  */
2118 void tomoyo_update_stat(const u8 index)
2119 {
2120         struct timeval tv;
2121         do_gettimeofday(&tv);
2122         /*
2123          * I don't use atomic operations because race condition is not fatal.
2124          */
2125         tomoyo_stat_updated[index]++;
2126         tomoyo_stat_modified[index] = tv.tv_sec;
2127 }
2128
2129 /**
2130  * tomoyo_read_stat - Read statistic data.
2131  *
2132  * @head: Pointer to "struct tomoyo_io_buffer".
2133  *
2134  * Returns nothing.
2135  */
2136 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2137 {
2138         u8 i;
2139         unsigned int total = 0;
2140         if (head->r.eof)
2141                 return;
2142         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2143                 tomoyo_io_printf(head, "Policy %-30s %10u",
2144                                  tomoyo_policy_headers[i],
2145                                  tomoyo_stat_updated[i]);
2146                 if (tomoyo_stat_modified[i]) {
2147                         struct tomoyo_time stamp;
2148                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2149                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2150                                          "%02u:%02u:%02u)",
2151                                          stamp.year, stamp.month, stamp.day,
2152                                          stamp.hour, stamp.min, stamp.sec);
2153                 }
2154                 tomoyo_set_lf(head);
2155         }
2156         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2157                 unsigned int used = tomoyo_memory_used[i];
2158                 total += used;
2159                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2160                                  tomoyo_memory_headers[i], used);
2161                 used = tomoyo_memory_quota[i];
2162                 if (used)
2163                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2164                 tomoyo_set_lf(head);
2165         }
2166         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2167                          total);
2168         head->r.eof = true;
2169 }
2170
2171 /**
2172  * tomoyo_write_stat - Set memory quota.
2173  *
2174  * @head: Pointer to "struct tomoyo_io_buffer".
2175  *
2176  * Returns 0.
2177  */
2178 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2179 {
2180         char *data = head->write_buf;
2181         u8 i;
2182         if (tomoyo_str_starts(&data, "Memory used by "))
2183                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2184                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2185                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2186         return 0;
2187 }
2188
2189 /**
2190  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2191  *
2192  * @type: Type of interface.
2193  * @file: Pointer to "struct file".
2194  *
2195  * Returns 0 on success, negative value otherwise.
2196  */
2197 int tomoyo_open_control(const u8 type, struct file *file)
2198 {
2199         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2200
2201         if (!head)
2202                 return -ENOMEM;
2203         mutex_init(&head->io_sem);
2204         head->type = type;
2205         switch (type) {
2206         case TOMOYO_DOMAINPOLICY:
2207                 /* /sys/kernel/security/tomoyo/domain_policy */
2208                 head->write = tomoyo_write_domain;
2209                 head->read = tomoyo_read_domain;
2210                 break;
2211         case TOMOYO_EXCEPTIONPOLICY:
2212                 /* /sys/kernel/security/tomoyo/exception_policy */
2213                 head->write = tomoyo_write_exception;
2214                 head->read = tomoyo_read_exception;
2215                 break;
2216         case TOMOYO_AUDIT:
2217                 /* /sys/kernel/security/tomoyo/audit */
2218                 head->poll = tomoyo_poll_log;
2219                 head->read = tomoyo_read_log;
2220                 break;
2221         case TOMOYO_SELFDOMAIN:
2222                 /* /sys/kernel/security/tomoyo/self_domain */
2223                 head->read = tomoyo_read_self_domain;
2224                 break;
2225         case TOMOYO_PROCESS_STATUS:
2226                 /* /sys/kernel/security/tomoyo/.process_status */
2227                 head->write = tomoyo_write_pid;
2228                 head->read = tomoyo_read_pid;
2229                 break;
2230         case TOMOYO_VERSION:
2231                 /* /sys/kernel/security/tomoyo/version */
2232                 head->read = tomoyo_read_version;
2233                 head->readbuf_size = 128;
2234                 break;
2235         case TOMOYO_STAT:
2236                 /* /sys/kernel/security/tomoyo/stat */
2237                 head->write = tomoyo_write_stat;
2238                 head->read = tomoyo_read_stat;
2239                 head->readbuf_size = 1024;
2240                 break;
2241         case TOMOYO_PROFILE:
2242                 /* /sys/kernel/security/tomoyo/profile */
2243                 head->write = tomoyo_write_profile;
2244                 head->read = tomoyo_read_profile;
2245                 break;
2246         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2247                 head->poll = tomoyo_poll_query;
2248                 head->write = tomoyo_write_answer;
2249                 head->read = tomoyo_read_query;
2250                 break;
2251         case TOMOYO_MANAGER:
2252                 /* /sys/kernel/security/tomoyo/manager */
2253                 head->write = tomoyo_write_manager;
2254                 head->read = tomoyo_read_manager;
2255                 break;
2256         }
2257         if (!(file->f_mode & FMODE_READ)) {
2258                 /*
2259                  * No need to allocate read_buf since it is not opened
2260                  * for reading.
2261                  */
2262                 head->read = NULL;
2263                 head->poll = NULL;
2264         } else if (!head->poll) {
2265                 /* Don't allocate read_buf for poll() access. */
2266                 if (!head->readbuf_size)
2267                         head->readbuf_size = 4096 * 2;
2268                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2269                 if (!head->read_buf) {
2270                         kfree(head);
2271                         return -ENOMEM;
2272                 }
2273         }
2274         if (!(file->f_mode & FMODE_WRITE)) {
2275                 /*
2276                  * No need to allocate write_buf since it is not opened
2277                  * for writing.
2278                  */
2279                 head->write = NULL;
2280         } else if (head->write) {
2281                 head->writebuf_size = 4096 * 2;
2282                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2283                 if (!head->write_buf) {
2284                         kfree(head->read_buf);
2285                         kfree(head);
2286                         return -ENOMEM;
2287                 }
2288         }
2289         /*
2290          * If the file is /sys/kernel/security/tomoyo/query , increment the
2291          * observer counter.
2292          * The obserber counter is used by tomoyo_supervisor() to see if
2293          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2294          */
2295         if (type == TOMOYO_QUERY)
2296                 atomic_inc(&tomoyo_query_observers);
2297         file->private_data = head;
2298         tomoyo_notify_gc(head, true);
2299         return 0;
2300 }
2301
2302 /**
2303  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2304  *
2305  * @file: Pointer to "struct file".
2306  * @wait: Pointer to "poll_table".
2307  *
2308  * Waits for read readiness.
2309  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
2310  * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
2311  */
2312 int tomoyo_poll_control(struct file *file, poll_table *wait)
2313 {
2314         struct tomoyo_io_buffer *head = file->private_data;
2315         if (!head->poll)
2316                 return -ENOSYS;
2317         return head->poll(file, wait);
2318 }
2319
2320 /**
2321  * tomoyo_set_namespace_cursor - Set namespace to read.
2322  *
2323  * @head: Pointer to "struct tomoyo_io_buffer".
2324  *
2325  * Returns nothing.
2326  */
2327 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2328 {
2329         struct list_head *ns;
2330         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2331             head->type != TOMOYO_PROFILE)
2332                 return;
2333         /*
2334          * If this is the first read, or reading previous namespace finished
2335          * and has more namespaces to read, update the namespace cursor.
2336          */
2337         ns = head->r.ns;
2338         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2339                 /* Clearing is OK because tomoyo_flush() returned true. */
2340                 memset(&head->r, 0, sizeof(head->r));
2341                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2342         }
2343 }
2344
2345 /**
2346  * tomoyo_has_more_namespace - Check for unread namespaces.
2347  *
2348  * @head: Pointer to "struct tomoyo_io_buffer".
2349  *
2350  * Returns true if we have more entries to print, false otherwise.
2351  */
2352 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2353 {
2354         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2355                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2356                 head->r.ns->next != &tomoyo_namespace_list;
2357 }
2358
2359 /**
2360  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2361  *
2362  * @head:       Pointer to "struct tomoyo_io_buffer".
2363  * @buffer:     Poiner to buffer to write to.
2364  * @buffer_len: Size of @buffer.
2365  *
2366  * Returns bytes read on success, negative value otherwise.
2367  */
2368 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2369                             const int buffer_len)
2370 {
2371         int len;
2372         int idx;
2373
2374         if (!head->read)
2375                 return -ENOSYS;
2376         if (mutex_lock_interruptible(&head->io_sem))
2377                 return -EINTR;
2378         head->read_user_buf = buffer;
2379         head->read_user_buf_avail = buffer_len;
2380         idx = tomoyo_read_lock();
2381         if (tomoyo_flush(head))
2382                 /* Call the policy handler. */
2383                 do {
2384                         tomoyo_set_namespace_cursor(head);
2385                         head->read(head);
2386                 } while (tomoyo_flush(head) &&
2387                          tomoyo_has_more_namespace(head));
2388         tomoyo_read_unlock(idx);
2389         len = head->read_user_buf - buffer;
2390         mutex_unlock(&head->io_sem);
2391         return len;
2392 }
2393
2394 /**
2395  * tomoyo_parse_policy - Parse a policy line.
2396  *
2397  * @head: Poiter to "struct tomoyo_io_buffer".
2398  * @line: Line to parse.
2399  *
2400  * Returns 0 on success, negative value otherwise.
2401  *
2402  * Caller holds tomoyo_read_lock().
2403  */
2404 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2405 {
2406         /* Delete request? */
2407         head->w.is_delete = !strncmp(line, "delete ", 7);
2408         if (head->w.is_delete)
2409                 memmove(line, line + 7, strlen(line + 7) + 1);
2410         /* Selecting namespace to update. */
2411         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2412             head->type == TOMOYO_PROFILE) {
2413                 if (*line == '<') {
2414                         char *cp = strchr(line, ' ');
2415                         if (cp) {
2416                                 *cp++ = '\0';
2417                                 head->w.ns = tomoyo_assign_namespace(line);
2418                                 memmove(line, cp, strlen(cp) + 1);
2419                         } else
2420                                 head->w.ns = NULL;
2421                 } else
2422                         head->w.ns = &tomoyo_kernel_namespace;
2423                 /* Don't allow updating if namespace is invalid. */
2424                 if (!head->w.ns)
2425                         return -ENOENT;
2426         }
2427         /* Do the update. */
2428         return head->write(head);
2429 }
2430
2431 /**
2432  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2433  *
2434  * @head:       Pointer to "struct tomoyo_io_buffer".
2435  * @buffer:     Pointer to buffer to read from.
2436  * @buffer_len: Size of @buffer.
2437  *
2438  * Returns @buffer_len on success, negative value otherwise.
2439  */
2440 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2441                              const char __user *buffer, const int buffer_len)
2442 {
2443         int error = buffer_len;
2444         size_t avail_len = buffer_len;
2445         char *cp0 = head->write_buf;
2446         int idx;
2447         if (!head->write)
2448                 return -ENOSYS;
2449         if (!access_ok(VERIFY_READ, buffer, buffer_len))
2450                 return -EFAULT;
2451         if (mutex_lock_interruptible(&head->io_sem))
2452                 return -EINTR;
2453         idx = tomoyo_read_lock();
2454         /* Read a line and dispatch it to the policy handler. */
2455         while (avail_len > 0) {
2456                 char c;
2457                 if (head->w.avail >= head->writebuf_size - 1) {
2458                         const int len = head->writebuf_size * 2;
2459                         char *cp = kzalloc(len, GFP_NOFS);
2460                         if (!cp) {
2461                                 error = -ENOMEM;
2462                                 break;
2463                         }
2464                         memmove(cp, cp0, head->w.avail);
2465                         kfree(cp0);
2466                         head->write_buf = cp;
2467                         cp0 = cp;
2468                         head->writebuf_size = len;
2469                 }
2470                 if (get_user(c, buffer)) {
2471                         error = -EFAULT;
2472                         break;
2473                 }
2474                 buffer++;
2475                 avail_len--;
2476                 cp0[head->w.avail++] = c;
2477                 if (c != '\n')
2478                         continue;
2479                 cp0[head->w.avail - 1] = '\0';
2480                 head->w.avail = 0;
2481                 tomoyo_normalize_line(cp0);
2482                 if (!strcmp(cp0, "reset")) {
2483                         head->w.ns = &tomoyo_kernel_namespace;
2484                         head->w.domain = NULL;
2485                         memset(&head->r, 0, sizeof(head->r));
2486                         continue;
2487                 }
2488                 /* Don't allow updating policies by non manager programs. */
2489                 switch (head->type) {
2490                 case TOMOYO_PROCESS_STATUS:
2491                         /* This does not write anything. */
2492                         break;
2493                 case TOMOYO_DOMAINPOLICY:
2494                         if (tomoyo_select_domain(head, cp0))
2495                                 continue;
2496                         /* fall through */
2497                 case TOMOYO_EXCEPTIONPOLICY:
2498                         if (!strcmp(cp0, "select transition_only")) {
2499                                 head->r.print_transition_related_only = true;
2500                                 continue;
2501                         }
2502                         /* fall through */
2503                 default:
2504                         if (!tomoyo_manager()) {
2505                                 error = -EPERM;
2506                                 goto out;
2507                         }
2508                 }
2509                 switch (tomoyo_parse_policy(head, cp0)) {
2510                 case -EPERM:
2511                         error = -EPERM;
2512                         goto out;
2513                 case 0:
2514                         switch (head->type) {
2515                         case TOMOYO_DOMAINPOLICY:
2516                         case TOMOYO_EXCEPTIONPOLICY:
2517                         case TOMOYO_STAT:
2518                         case TOMOYO_PROFILE:
2519                         case TOMOYO_MANAGER:
2520                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2521                                 break;
2522                         default:
2523                                 break;
2524                         }
2525                         break;
2526                 }
2527         }
2528 out:
2529         tomoyo_read_unlock(idx);
2530         mutex_unlock(&head->io_sem);
2531         return error;
2532 }
2533
2534 /**
2535  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2536  *
2537  * @head: Pointer to "struct tomoyo_io_buffer".
2538  *
2539  * Returns 0.
2540  */
2541 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2542 {
2543         /*
2544          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2545          * observer counter.
2546          */
2547         if (head->type == TOMOYO_QUERY &&
2548             atomic_dec_and_test(&tomoyo_query_observers))
2549                 wake_up_all(&tomoyo_answer_wait);
2550         tomoyo_notify_gc(head, false);
2551         return 0;
2552 }
2553
2554 /**
2555  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2556  */
2557 void tomoyo_check_profile(void)
2558 {
2559         struct tomoyo_domain_info *domain;
2560         const int idx = tomoyo_read_lock();
2561         tomoyo_policy_loaded = true;
2562         printk(KERN_INFO "TOMOYO: 2.4.0\n");
2563         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2564                 const u8 profile = domain->profile;
2565                 const struct tomoyo_policy_namespace *ns = domain->ns;
2566                 if (ns->profile_version != 20100903)
2567                         printk(KERN_ERR
2568                                "Profile version %u is not supported.\n",
2569                                ns->profile_version);
2570                 else if (!ns->profile_ptr[profile])
2571                         printk(KERN_ERR
2572                                "Profile %u (used by '%s') is not defined.\n",
2573                                profile, domain->domainname->name);
2574                 else
2575                         continue;
2576                 printk(KERN_ERR
2577                        "Userland tools for TOMOYO 2.4 must be installed and "
2578                        "policy must be initialized.\n");
2579                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.4/ "
2580                        "for more information.\n");
2581                 panic("STOP!");
2582         }
2583         tomoyo_read_unlock(idx);
2584         printk(KERN_INFO "Mandatory Access Control activated.\n");
2585 }
2586
2587 /**
2588  * tomoyo_load_builtin_policy - Load built-in policy.
2589  *
2590  * Returns nothing.
2591  */
2592 void __init tomoyo_load_builtin_policy(void)
2593 {
2594         /*
2595          * This include file is manually created and contains built-in policy
2596          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2597          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2598          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2599          */
2600 #include "builtin-policy.h"
2601         u8 i;
2602         const int idx = tomoyo_read_lock();
2603         for (i = 0; i < 5; i++) {
2604                 struct tomoyo_io_buffer head = { };
2605                 char *start = "";
2606                 switch (i) {
2607                 case 0:
2608                         start = tomoyo_builtin_profile;
2609                         head.type = TOMOYO_PROFILE;
2610                         head.write = tomoyo_write_profile;
2611                         break;
2612                 case 1:
2613                         start = tomoyo_builtin_exception_policy;
2614                         head.type = TOMOYO_EXCEPTIONPOLICY;
2615                         head.write = tomoyo_write_exception;
2616                         break;
2617                 case 2:
2618                         start = tomoyo_builtin_domain_policy;
2619                         head.type = TOMOYO_DOMAINPOLICY;
2620                         head.write = tomoyo_write_domain;
2621                         break;
2622                 case 3:
2623                         start = tomoyo_builtin_manager;
2624                         head.type = TOMOYO_MANAGER;
2625                         head.write = tomoyo_write_manager;
2626                         break;
2627                 case 4:
2628                         start = tomoyo_builtin_stat;
2629                         head.type = TOMOYO_STAT;
2630                         head.write = tomoyo_write_stat;
2631                         break;
2632                 }
2633                 while (1) {
2634                         char *end = strchr(start, '\n');
2635                         if (!end)
2636                                 break;
2637                         *end = '\0';
2638                         tomoyo_normalize_line(start);
2639                         head.write_buf = start;
2640                         tomoyo_parse_policy(&head, start);
2641                         start = end + 1;
2642                 }
2643         }
2644         tomoyo_read_unlock(idx);
2645 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2646         tomoyo_check_profile();
2647 #endif
2648 }