2704c384bf1e67a574b7f9e4741b4d8888ca50fa
[linux-2.6.git] / security / tomoyo / common.c
1 /*
2  * security/tomoyo/common.c
3  *
4  * Copyright (C) 2005-2011  NTT DATA CORPORATION
5  */
6
7 #include <linux/uaccess.h>
8 #include <linux/slab.h>
9 #include <linux/security.h>
10 #include "common.h"
11
12 /* String table for operation mode. */
13 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
14         [TOMOYO_CONFIG_DISABLED]   = "disabled",
15         [TOMOYO_CONFIG_LEARNING]   = "learning",
16         [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
17         [TOMOYO_CONFIG_ENFORCING]  = "enforcing"
18 };
19
20 /* String table for /sys/kernel/security/tomoyo/profile */
21 const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
22                                        + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
23         /* CONFIG::file group */
24         [TOMOYO_MAC_FILE_EXECUTE]    = "execute",
25         [TOMOYO_MAC_FILE_OPEN]       = "open",
26         [TOMOYO_MAC_FILE_CREATE]     = "create",
27         [TOMOYO_MAC_FILE_UNLINK]     = "unlink",
28         [TOMOYO_MAC_FILE_GETATTR]    = "getattr",
29         [TOMOYO_MAC_FILE_MKDIR]      = "mkdir",
30         [TOMOYO_MAC_FILE_RMDIR]      = "rmdir",
31         [TOMOYO_MAC_FILE_MKFIFO]     = "mkfifo",
32         [TOMOYO_MAC_FILE_MKSOCK]     = "mksock",
33         [TOMOYO_MAC_FILE_TRUNCATE]   = "truncate",
34         [TOMOYO_MAC_FILE_SYMLINK]    = "symlink",
35         [TOMOYO_MAC_FILE_MKBLOCK]    = "mkblock",
36         [TOMOYO_MAC_FILE_MKCHAR]     = "mkchar",
37         [TOMOYO_MAC_FILE_LINK]       = "link",
38         [TOMOYO_MAC_FILE_RENAME]     = "rename",
39         [TOMOYO_MAC_FILE_CHMOD]      = "chmod",
40         [TOMOYO_MAC_FILE_CHOWN]      = "chown",
41         [TOMOYO_MAC_FILE_CHGRP]      = "chgrp",
42         [TOMOYO_MAC_FILE_IOCTL]      = "ioctl",
43         [TOMOYO_MAC_FILE_CHROOT]     = "chroot",
44         [TOMOYO_MAC_FILE_MOUNT]      = "mount",
45         [TOMOYO_MAC_FILE_UMOUNT]     = "unmount",
46         [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
47         /* CONFIG::network group */
48         [TOMOYO_MAC_NETWORK_INET_STREAM_BIND]       = "inet_stream_bind",
49         [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN]     = "inet_stream_listen",
50         [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT]    = "inet_stream_connect",
51         [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND]        = "inet_dgram_bind",
52         [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND]        = "inet_dgram_send",
53         [TOMOYO_MAC_NETWORK_INET_RAW_BIND]          = "inet_raw_bind",
54         [TOMOYO_MAC_NETWORK_INET_RAW_SEND]          = "inet_raw_send",
55         [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND]       = "unix_stream_bind",
56         [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN]     = "unix_stream_listen",
57         [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT]    = "unix_stream_connect",
58         [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND]        = "unix_dgram_bind",
59         [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND]        = "unix_dgram_send",
60         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND]    = "unix_seqpacket_bind",
61         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN]  = "unix_seqpacket_listen",
62         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
63         /* CONFIG::misc group */
64         [TOMOYO_MAC_ENVIRON] = "env",
65         /* CONFIG group */
66         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
67         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
68         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
69 };
70
71 /* String table for conditions. */
72 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
73         [TOMOYO_TASK_UID]             = "task.uid",
74         [TOMOYO_TASK_EUID]            = "task.euid",
75         [TOMOYO_TASK_SUID]            = "task.suid",
76         [TOMOYO_TASK_FSUID]           = "task.fsuid",
77         [TOMOYO_TASK_GID]             = "task.gid",
78         [TOMOYO_TASK_EGID]            = "task.egid",
79         [TOMOYO_TASK_SGID]            = "task.sgid",
80         [TOMOYO_TASK_FSGID]           = "task.fsgid",
81         [TOMOYO_TASK_PID]             = "task.pid",
82         [TOMOYO_TASK_PPID]            = "task.ppid",
83         [TOMOYO_EXEC_ARGC]            = "exec.argc",
84         [TOMOYO_EXEC_ENVC]            = "exec.envc",
85         [TOMOYO_TYPE_IS_SOCKET]       = "socket",
86         [TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
87         [TOMOYO_TYPE_IS_FILE]         = "file",
88         [TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
89         [TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
90         [TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
91         [TOMOYO_TYPE_IS_FIFO]         = "fifo",
92         [TOMOYO_MODE_SETUID]          = "setuid",
93         [TOMOYO_MODE_SETGID]          = "setgid",
94         [TOMOYO_MODE_STICKY]          = "sticky",
95         [TOMOYO_MODE_OWNER_READ]      = "owner_read",
96         [TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
97         [TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
98         [TOMOYO_MODE_GROUP_READ]      = "group_read",
99         [TOMOYO_MODE_GROUP_WRITE]     = "group_write",
100         [TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
101         [TOMOYO_MODE_OTHERS_READ]     = "others_read",
102         [TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
103         [TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
104         [TOMOYO_EXEC_REALPATH]        = "exec.realpath",
105         [TOMOYO_SYMLINK_TARGET]       = "symlink.target",
106         [TOMOYO_PATH1_UID]            = "path1.uid",
107         [TOMOYO_PATH1_GID]            = "path1.gid",
108         [TOMOYO_PATH1_INO]            = "path1.ino",
109         [TOMOYO_PATH1_MAJOR]          = "path1.major",
110         [TOMOYO_PATH1_MINOR]          = "path1.minor",
111         [TOMOYO_PATH1_PERM]           = "path1.perm",
112         [TOMOYO_PATH1_TYPE]           = "path1.type",
113         [TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
114         [TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
115         [TOMOYO_PATH2_UID]            = "path2.uid",
116         [TOMOYO_PATH2_GID]            = "path2.gid",
117         [TOMOYO_PATH2_INO]            = "path2.ino",
118         [TOMOYO_PATH2_MAJOR]          = "path2.major",
119         [TOMOYO_PATH2_MINOR]          = "path2.minor",
120         [TOMOYO_PATH2_PERM]           = "path2.perm",
121         [TOMOYO_PATH2_TYPE]           = "path2.type",
122         [TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
123         [TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
124         [TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
125         [TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
126         [TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
127         [TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
128         [TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
129         [TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
130         [TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
131         [TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
132 };
133
134 /* String table for PREFERENCE keyword. */
135 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
136         [TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
137         [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
138 };
139
140 /* String table for path operation. */
141 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
142         [TOMOYO_TYPE_EXECUTE]    = "execute",
143         [TOMOYO_TYPE_READ]       = "read",
144         [TOMOYO_TYPE_WRITE]      = "write",
145         [TOMOYO_TYPE_APPEND]     = "append",
146         [TOMOYO_TYPE_UNLINK]     = "unlink",
147         [TOMOYO_TYPE_GETATTR]    = "getattr",
148         [TOMOYO_TYPE_RMDIR]      = "rmdir",
149         [TOMOYO_TYPE_TRUNCATE]   = "truncate",
150         [TOMOYO_TYPE_SYMLINK]    = "symlink",
151         [TOMOYO_TYPE_CHROOT]     = "chroot",
152         [TOMOYO_TYPE_UMOUNT]     = "unmount",
153 };
154
155 /* String table for socket's operation. */
156 const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
157         [TOMOYO_NETWORK_BIND]    = "bind",
158         [TOMOYO_NETWORK_LISTEN]  = "listen",
159         [TOMOYO_NETWORK_CONNECT] = "connect",
160         [TOMOYO_NETWORK_SEND]    = "send",
161 };
162
163 /* String table for categories. */
164 static const char * const tomoyo_category_keywords
165 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
166         [TOMOYO_MAC_CATEGORY_FILE]    = "file",
167         [TOMOYO_MAC_CATEGORY_NETWORK] = "network",
168         [TOMOYO_MAC_CATEGORY_MISC]    = "misc",
169 };
170
171 /* Permit policy management by non-root user? */
172 static bool tomoyo_manage_by_non_root;
173
174 /* Utility functions. */
175
176 /**
177  * tomoyo_yesno - Return "yes" or "no".
178  *
179  * @value: Bool value.
180  */
181 const char *tomoyo_yesno(const unsigned int value)
182 {
183         return value ? "yes" : "no";
184 }
185
186 /**
187  * tomoyo_addprintf - strncat()-like-snprintf().
188  *
189  * @buffer: Buffer to write to. Must be '\0'-terminated.
190  * @len:    Size of @buffer.
191  * @fmt:    The printf()'s format string, followed by parameters.
192  *
193  * Returns nothing.
194  */
195 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
196 {
197         va_list args;
198         const int pos = strlen(buffer);
199         va_start(args, fmt);
200         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
201         va_end(args);
202 }
203
204 /**
205  * tomoyo_flush - Flush queued string to userspace's buffer.
206  *
207  * @head:   Pointer to "struct tomoyo_io_buffer".
208  *
209  * Returns true if all data was flushed, false otherwise.
210  */
211 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
212 {
213         while (head->r.w_pos) {
214                 const char *w = head->r.w[0];
215                 size_t len = strlen(w);
216                 if (len) {
217                         if (len > head->read_user_buf_avail)
218                                 len = head->read_user_buf_avail;
219                         if (!len)
220                                 return false;
221                         if (copy_to_user(head->read_user_buf, w, len))
222                                 return false;
223                         head->read_user_buf_avail -= len;
224                         head->read_user_buf += len;
225                         w += len;
226                 }
227                 head->r.w[0] = w;
228                 if (*w)
229                         return false;
230                 /* Add '\0' for audit logs and query. */
231                 if (head->poll) {
232                         if (!head->read_user_buf_avail ||
233                             copy_to_user(head->read_user_buf, "", 1))
234                                 return false;
235                         head->read_user_buf_avail--;
236                         head->read_user_buf++;
237                 }
238                 head->r.w_pos--;
239                 for (len = 0; len < head->r.w_pos; len++)
240                         head->r.w[len] = head->r.w[len + 1];
241         }
242         head->r.avail = 0;
243         return true;
244 }
245
246 /**
247  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
248  *
249  * @head:   Pointer to "struct tomoyo_io_buffer".
250  * @string: String to print.
251  *
252  * Note that @string has to be kept valid until @head is kfree()d.
253  * This means that char[] allocated on stack memory cannot be passed to
254  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
255  */
256 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
257 {
258         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
259                 head->r.w[head->r.w_pos++] = string;
260                 tomoyo_flush(head);
261         } else
262                 WARN_ON(1);
263 }
264
265 /**
266  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
267  *
268  * @head: Pointer to "struct tomoyo_io_buffer".
269  * @fmt:  The printf()'s format string, followed by parameters.
270  */
271 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
272 {
273         va_list args;
274         size_t len;
275         size_t pos = head->r.avail;
276         int size = head->readbuf_size - pos;
277         if (size <= 0)
278                 return;
279         va_start(args, fmt);
280         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
281         va_end(args);
282         if (pos + len >= head->readbuf_size) {
283                 WARN_ON(1);
284                 return;
285         }
286         head->r.avail += len;
287         tomoyo_set_string(head, head->read_buf + pos);
288 }
289
290 /**
291  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
292  *
293  * @head: Pointer to "struct tomoyo_io_buffer".
294  *
295  * Returns nothing.
296  */
297 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
298 {
299         tomoyo_set_string(head, " ");
300 }
301
302 /**
303  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
304  *
305  * @head: Pointer to "struct tomoyo_io_buffer".
306  *
307  * Returns nothing.
308  */
309 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
310 {
311         tomoyo_set_string(head, "\n");
312         return !head->r.w_pos;
313 }
314
315 /**
316  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
317  *
318  * @head: Pointer to "struct tomoyo_io_buffer".
319  *
320  * Returns nothing.
321  */
322 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
323 {
324         tomoyo_set_string(head, "/");
325 }
326
327 /* List of namespaces. */
328 LIST_HEAD(tomoyo_namespace_list);
329 /* True if namespace other than tomoyo_kernel_namespace is defined. */
330 static bool tomoyo_namespace_enabled;
331
332 /**
333  * tomoyo_init_policy_namespace - Initialize namespace.
334  *
335  * @ns: Pointer to "struct tomoyo_policy_namespace".
336  *
337  * Returns nothing.
338  */
339 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
340 {
341         unsigned int idx;
342         for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
343                 INIT_LIST_HEAD(&ns->acl_group[idx]);
344         for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
345                 INIT_LIST_HEAD(&ns->group_list[idx]);
346         for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
347                 INIT_LIST_HEAD(&ns->policy_list[idx]);
348         ns->profile_version = 20100903;
349         tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
350         list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
351 }
352
353 /**
354  * tomoyo_print_namespace - Print namespace header.
355  *
356  * @head: Pointer to "struct tomoyo_io_buffer".
357  *
358  * Returns nothing.
359  */
360 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
361 {
362         if (!tomoyo_namespace_enabled)
363                 return;
364         tomoyo_set_string(head,
365                           container_of(head->r.ns,
366                                        struct tomoyo_policy_namespace,
367                                        namespace_list)->name);
368         tomoyo_set_space(head);
369 }
370
371 /**
372  * tomoyo_print_name_union - Print a tomoyo_name_union.
373  *
374  * @head: Pointer to "struct tomoyo_io_buffer".
375  * @ptr:  Pointer to "struct tomoyo_name_union".
376  */
377 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
378                                     const struct tomoyo_name_union *ptr)
379 {
380         tomoyo_set_space(head);
381         if (ptr->group) {
382                 tomoyo_set_string(head, "@");
383                 tomoyo_set_string(head, ptr->group->group_name->name);
384         } else {
385                 tomoyo_set_string(head, ptr->filename->name);
386         }
387 }
388
389 /**
390  * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
391  *
392  * @head: Pointer to "struct tomoyo_io_buffer".
393  * @ptr:  Pointer to "struct tomoyo_name_union".
394  *
395  * Returns nothing.
396  */
397 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
398                                            const struct tomoyo_name_union *ptr)
399 {
400         if (ptr->group) {
401                 tomoyo_set_string(head, "@");
402                 tomoyo_set_string(head, ptr->group->group_name->name);
403         } else {
404                 tomoyo_set_string(head, "\"");
405                 tomoyo_set_string(head, ptr->filename->name);
406                 tomoyo_set_string(head, "\"");
407         }
408 }
409
410 /**
411  * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
412  *
413  * @head: Pointer to "struct tomoyo_io_buffer".
414  * @ptr:  Pointer to "struct tomoyo_number_union".
415  *
416  * Returns nothing.
417  */
418 static void tomoyo_print_number_union_nospace
419 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
420 {
421         if (ptr->group) {
422                 tomoyo_set_string(head, "@");
423                 tomoyo_set_string(head, ptr->group->group_name->name);
424         } else {
425                 int i;
426                 unsigned long min = ptr->values[0];
427                 const unsigned long max = ptr->values[1];
428                 u8 min_type = ptr->value_type[0];
429                 const u8 max_type = ptr->value_type[1];
430                 char buffer[128];
431                 buffer[0] = '\0';
432                 for (i = 0; i < 2; i++) {
433                         switch (min_type) {
434                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
435                                 tomoyo_addprintf(buffer, sizeof(buffer),
436                                                  "0x%lX", min);
437                                 break;
438                         case TOMOYO_VALUE_TYPE_OCTAL:
439                                 tomoyo_addprintf(buffer, sizeof(buffer),
440                                                  "0%lo", min);
441                                 break;
442                         default:
443                                 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
444                                                  min);
445                                 break;
446                         }
447                         if (min == max && min_type == max_type)
448                                 break;
449                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
450                         min_type = max_type;
451                         min = max;
452                 }
453                 tomoyo_io_printf(head, "%s", buffer);
454         }
455 }
456
457 /**
458  * tomoyo_print_number_union - Print a tomoyo_number_union.
459  *
460  * @head: Pointer to "struct tomoyo_io_buffer".
461  * @ptr:  Pointer to "struct tomoyo_number_union".
462  *
463  * Returns nothing.
464  */
465 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
466                                       const struct tomoyo_number_union *ptr)
467 {
468         tomoyo_set_space(head);
469         tomoyo_print_number_union_nospace(head, ptr);
470 }
471
472 /**
473  * tomoyo_assign_profile - Create a new profile.
474  *
475  * @ns:      Pointer to "struct tomoyo_policy_namespace".
476  * @profile: Profile number to create.
477  *
478  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
479  */
480 static struct tomoyo_profile *tomoyo_assign_profile
481 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
482 {
483         struct tomoyo_profile *ptr;
484         struct tomoyo_profile *entry;
485         if (profile >= TOMOYO_MAX_PROFILES)
486                 return NULL;
487         ptr = ns->profile_ptr[profile];
488         if (ptr)
489                 return ptr;
490         entry = kzalloc(sizeof(*entry), GFP_NOFS);
491         if (mutex_lock_interruptible(&tomoyo_policy_lock))
492                 goto out;
493         ptr = ns->profile_ptr[profile];
494         if (!ptr && tomoyo_memory_ok(entry)) {
495                 ptr = entry;
496                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
497                         TOMOYO_CONFIG_WANT_GRANT_LOG |
498                         TOMOYO_CONFIG_WANT_REJECT_LOG;
499                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
500                        sizeof(ptr->config));
501                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] = 1024;
502                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] = 2048;
503                 mb(); /* Avoid out-of-order execution. */
504                 ns->profile_ptr[profile] = ptr;
505                 entry = NULL;
506         }
507         mutex_unlock(&tomoyo_policy_lock);
508  out:
509         kfree(entry);
510         return ptr;
511 }
512
513 /**
514  * tomoyo_profile - Find a profile.
515  *
516  * @ns:      Pointer to "struct tomoyo_policy_namespace".
517  * @profile: Profile number to find.
518  *
519  * Returns pointer to "struct tomoyo_profile".
520  */
521 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
522                                       const u8 profile)
523 {
524         static struct tomoyo_profile tomoyo_null_profile;
525         struct tomoyo_profile *ptr = ns->profile_ptr[profile];
526         if (!ptr)
527                 ptr = &tomoyo_null_profile;
528         return ptr;
529 }
530
531 /**
532  * tomoyo_find_yesno - Find values for specified keyword.
533  *
534  * @string: String to check.
535  * @find:   Name of keyword.
536  *
537  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
538  */
539 static s8 tomoyo_find_yesno(const char *string, const char *find)
540 {
541         const char *cp = strstr(string, find);
542         if (cp) {
543                 cp += strlen(find);
544                 if (!strncmp(cp, "=yes", 4))
545                         return 1;
546                 else if (!strncmp(cp, "=no", 3))
547                         return 0;
548         }
549         return -1;
550 }
551
552 /**
553  * tomoyo_set_uint - Set value for specified preference.
554  *
555  * @i:      Pointer to "unsigned int".
556  * @string: String to check.
557  * @find:   Name of keyword.
558  *
559  * Returns nothing.
560  */
561 static void tomoyo_set_uint(unsigned int *i, const char *string,
562                             const char *find)
563 {
564         const char *cp = strstr(string, find);
565         if (cp)
566                 sscanf(cp + strlen(find), "=%u", i);
567 }
568
569 /**
570  * tomoyo_set_mode - Set mode for specified profile.
571  *
572  * @name:    Name of functionality.
573  * @value:   Mode for @name.
574  * @profile: Pointer to "struct tomoyo_profile".
575  *
576  * Returns 0 on success, negative value otherwise.
577  */
578 static int tomoyo_set_mode(char *name, const char *value,
579                            struct tomoyo_profile *profile)
580 {
581         u8 i;
582         u8 config;
583         if (!strcmp(name, "CONFIG")) {
584                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
585                 config = profile->default_config;
586         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
587                 config = 0;
588                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
589                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
590                         int len = 0;
591                         if (i < TOMOYO_MAX_MAC_INDEX) {
592                                 const u8 c = tomoyo_index2category[i];
593                                 const char *category =
594                                         tomoyo_category_keywords[c];
595                                 len = strlen(category);
596                                 if (strncmp(name, category, len) ||
597                                     name[len++] != ':' || name[len++] != ':')
598                                         continue;
599                         }
600                         if (strcmp(name + len, tomoyo_mac_keywords[i]))
601                                 continue;
602                         config = profile->config[i];
603                         break;
604                 }
605                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
606                         return -EINVAL;
607         } else {
608                 return -EINVAL;
609         }
610         if (strstr(value, "use_default")) {
611                 config = TOMOYO_CONFIG_USE_DEFAULT;
612         } else {
613                 u8 mode;
614                 for (mode = 0; mode < 4; mode++)
615                         if (strstr(value, tomoyo_mode[mode]))
616                                 /*
617                                  * Update lower 3 bits in order to distinguish
618                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
619                                  */
620                                 config = (config & ~7) | mode;
621                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
622                         switch (tomoyo_find_yesno(value, "grant_log")) {
623                         case 1:
624                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
625                                 break;
626                         case 0:
627                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
628                                 break;
629                         }
630                         switch (tomoyo_find_yesno(value, "reject_log")) {
631                         case 1:
632                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
633                                 break;
634                         case 0:
635                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
636                                 break;
637                         }
638                 }
639         }
640         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
641                 profile->config[i] = config;
642         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
643                 profile->default_config = config;
644         return 0;
645 }
646
647 /**
648  * tomoyo_write_profile - Write profile table.
649  *
650  * @head: Pointer to "struct tomoyo_io_buffer".
651  *
652  * Returns 0 on success, negative value otherwise.
653  */
654 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
655 {
656         char *data = head->write_buf;
657         unsigned int i;
658         char *cp;
659         struct tomoyo_profile *profile;
660         if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
661             == 1)
662                 return 0;
663         i = simple_strtoul(data, &cp, 10);
664         if (*cp != '-')
665                 return -EINVAL;
666         data = cp + 1;
667         profile = tomoyo_assign_profile(head->w.ns, i);
668         if (!profile)
669                 return -EINVAL;
670         cp = strchr(data, '=');
671         if (!cp)
672                 return -EINVAL;
673         *cp++ = '\0';
674         if (!strcmp(data, "COMMENT")) {
675                 static DEFINE_SPINLOCK(lock);
676                 const struct tomoyo_path_info *new_comment
677                         = tomoyo_get_name(cp);
678                 const struct tomoyo_path_info *old_comment;
679                 if (!new_comment)
680                         return -ENOMEM;
681                 spin_lock(&lock);
682                 old_comment = profile->comment;
683                 profile->comment = new_comment;
684                 spin_unlock(&lock);
685                 tomoyo_put_name(old_comment);
686                 return 0;
687         }
688         if (!strcmp(data, "PREFERENCE")) {
689                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
690                         tomoyo_set_uint(&profile->pref[i], cp,
691                                         tomoyo_pref_keywords[i]);
692                 return 0;
693         }
694         return tomoyo_set_mode(data, cp, profile);
695 }
696
697 /**
698  * tomoyo_print_config - Print mode for specified functionality.
699  *
700  * @head:   Pointer to "struct tomoyo_io_buffer".
701  * @config: Mode for that functionality.
702  *
703  * Returns nothing.
704  *
705  * Caller prints functionality's name.
706  */
707 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
708 {
709         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
710                          tomoyo_mode[config & 3],
711                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
712                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
713 }
714
715 /**
716  * tomoyo_read_profile - Read profile table.
717  *
718  * @head: Pointer to "struct tomoyo_io_buffer".
719  *
720  * Returns nothing.
721  */
722 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
723 {
724         u8 index;
725         struct tomoyo_policy_namespace *ns =
726                 container_of(head->r.ns, typeof(*ns), namespace_list);
727         const struct tomoyo_profile *profile;
728         if (head->r.eof)
729                 return;
730  next:
731         index = head->r.index;
732         profile = ns->profile_ptr[index];
733         switch (head->r.step) {
734         case 0:
735                 tomoyo_print_namespace(head);
736                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
737                                  ns->profile_version);
738                 head->r.step++;
739                 break;
740         case 1:
741                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
742                       head->r.index++)
743                         if (ns->profile_ptr[head->r.index])
744                                 break;
745                 if (head->r.index == TOMOYO_MAX_PROFILES)
746                         return;
747                 head->r.step++;
748                 break;
749         case 2:
750                 {
751                         u8 i;
752                         const struct tomoyo_path_info *comment =
753                                 profile->comment;
754                         tomoyo_print_namespace(head);
755                         tomoyo_io_printf(head, "%u-COMMENT=", index);
756                         tomoyo_set_string(head, comment ? comment->name : "");
757                         tomoyo_set_lf(head);
758                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
759                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
760                                 tomoyo_io_printf(head, "%s=%u ",
761                                                  tomoyo_pref_keywords[i],
762                                                  profile->pref[i]);
763                         tomoyo_set_string(head, "}\n");
764                         head->r.step++;
765                 }
766                 break;
767         case 3:
768                 {
769                         tomoyo_print_namespace(head);
770                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
771                         tomoyo_print_config(head, profile->default_config);
772                         head->r.bit = 0;
773                         head->r.step++;
774                 }
775                 break;
776         case 4:
777                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
778                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
779                         const u8 i = head->r.bit;
780                         const u8 config = profile->config[i];
781                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
782                                 continue;
783                         tomoyo_print_namespace(head);
784                         if (i < TOMOYO_MAX_MAC_INDEX)
785                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
786                                                  index,
787                                                  tomoyo_category_keywords
788                                                  [tomoyo_index2category[i]],
789                                                  tomoyo_mac_keywords[i]);
790                         else
791                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
792                                                  tomoyo_mac_keywords[i]);
793                         tomoyo_print_config(head, config);
794                         head->r.bit++;
795                         break;
796                 }
797                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
798                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
799                         head->r.index++;
800                         head->r.step = 1;
801                 }
802                 break;
803         }
804         if (tomoyo_flush(head))
805                 goto next;
806 }
807
808 /**
809  * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
810  *
811  * @a: Pointer to "struct tomoyo_acl_head".
812  * @b: Pointer to "struct tomoyo_acl_head".
813  *
814  * Returns true if @a == @b, false otherwise.
815  */
816 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
817                                 const struct tomoyo_acl_head *b)
818 {
819         return container_of(a, struct tomoyo_manager, head)->manager ==
820                 container_of(b, struct tomoyo_manager, head)->manager;
821 }
822
823 /**
824  * tomoyo_update_manager_entry - Add a manager entry.
825  *
826  * @manager:   The path to manager or the domainnamme.
827  * @is_delete: True if it is a delete request.
828  *
829  * Returns 0 on success, negative value otherwise.
830  *
831  * Caller holds tomoyo_read_lock().
832  */
833 static int tomoyo_update_manager_entry(const char *manager,
834                                        const bool is_delete)
835 {
836         struct tomoyo_manager e = { };
837         struct tomoyo_acl_param param = {
838                 /* .ns = &tomoyo_kernel_namespace, */
839                 .is_delete = is_delete,
840                 .list = &tomoyo_kernel_namespace.
841                 policy_list[TOMOYO_ID_MANAGER],
842         };
843         int error = is_delete ? -ENOENT : -ENOMEM;
844         if (tomoyo_domain_def(manager)) {
845                 if (!tomoyo_correct_domain(manager))
846                         return -EINVAL;
847                 e.is_domain = true;
848         } else {
849                 if (!tomoyo_correct_path(manager))
850                         return -EINVAL;
851         }
852         e.manager = tomoyo_get_name(manager);
853         if (e.manager) {
854                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
855                                              tomoyo_same_manager);
856                 tomoyo_put_name(e.manager);
857         }
858         return error;
859 }
860
861 /**
862  * tomoyo_write_manager - Write manager policy.
863  *
864  * @head: Pointer to "struct tomoyo_io_buffer".
865  *
866  * Returns 0 on success, negative value otherwise.
867  *
868  * Caller holds tomoyo_read_lock().
869  */
870 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
871 {
872         char *data = head->write_buf;
873
874         if (!strcmp(data, "manage_by_non_root")) {
875                 tomoyo_manage_by_non_root = !head->w.is_delete;
876                 return 0;
877         }
878         return tomoyo_update_manager_entry(data, head->w.is_delete);
879 }
880
881 /**
882  * tomoyo_read_manager - Read manager policy.
883  *
884  * @head: Pointer to "struct tomoyo_io_buffer".
885  *
886  * Caller holds tomoyo_read_lock().
887  */
888 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
889 {
890         if (head->r.eof)
891                 return;
892         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.
893                              policy_list[TOMOYO_ID_MANAGER]) {
894                 struct tomoyo_manager *ptr =
895                         list_entry(head->r.acl, typeof(*ptr), head.list);
896                 if (ptr->head.is_deleted)
897                         continue;
898                 if (!tomoyo_flush(head))
899                         return;
900                 tomoyo_set_string(head, ptr->manager->name);
901                 tomoyo_set_lf(head);
902         }
903         head->r.eof = true;
904 }
905
906 /**
907  * tomoyo_manager - Check whether the current process is a policy manager.
908  *
909  * Returns true if the current process is permitted to modify policy
910  * via /sys/kernel/security/tomoyo/ interface.
911  *
912  * Caller holds tomoyo_read_lock().
913  */
914 static bool tomoyo_manager(void)
915 {
916         struct tomoyo_manager *ptr;
917         const char *exe;
918         const struct task_struct *task = current;
919         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
920         bool found = false;
921
922         if (!tomoyo_policy_loaded)
923                 return true;
924         if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
925                 return false;
926         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
927                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
928                 if (!ptr->head.is_deleted && ptr->is_domain
929                     && !tomoyo_pathcmp(domainname, ptr->manager)) {
930                         found = true;
931                         break;
932                 }
933         }
934         if (found)
935                 return true;
936         exe = tomoyo_get_exe();
937         if (!exe)
938                 return false;
939         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.
940                                 policy_list[TOMOYO_ID_MANAGER], head.list) {
941                 if (!ptr->head.is_deleted && !ptr->is_domain
942                     && !strcmp(exe, ptr->manager->name)) {
943                         found = true;
944                         break;
945                 }
946         }
947         if (!found) { /* Reduce error messages. */
948                 static pid_t last_pid;
949                 const pid_t pid = current->pid;
950                 if (last_pid != pid) {
951                         printk(KERN_WARNING "%s ( %s ) is not permitted to "
952                                "update policies.\n", domainname->name, exe);
953                         last_pid = pid;
954                 }
955         }
956         kfree(exe);
957         return found;
958 }
959
960 /**
961  * tomoyo_select_domain - Parse select command.
962  *
963  * @head: Pointer to "struct tomoyo_io_buffer".
964  * @data: String to parse.
965  *
966  * Returns true on success, false otherwise.
967  *
968  * Caller holds tomoyo_read_lock().
969  */
970 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
971                                  const char *data)
972 {
973         unsigned int pid;
974         struct tomoyo_domain_info *domain = NULL;
975         bool global_pid = false;
976         if (strncmp(data, "select ", 7))
977                 return false;
978         data += 7;
979         if (sscanf(data, "pid=%u", &pid) == 1 ||
980             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
981                 struct task_struct *p;
982                 rcu_read_lock();
983                 read_lock(&tasklist_lock);
984                 if (global_pid)
985                         p = find_task_by_pid_ns(pid, &init_pid_ns);
986                 else
987                         p = find_task_by_vpid(pid);
988                 if (p)
989                         domain = tomoyo_real_domain(p);
990                 read_unlock(&tasklist_lock);
991                 rcu_read_unlock();
992         } else if (!strncmp(data, "domain=", 7)) {
993                 if (tomoyo_domain_def(data + 7))
994                         domain = tomoyo_find_domain(data + 7);
995         } else
996                 return false;
997         head->w.domain = domain;
998         /* Accessing read_buf is safe because head->io_sem is held. */
999         if (!head->read_buf)
1000                 return true; /* Do nothing if open(O_WRONLY). */
1001         memset(&head->r, 0, sizeof(head->r));
1002         head->r.print_this_domain_only = true;
1003         if (domain)
1004                 head->r.domain = &domain->list;
1005         else
1006                 head->r.eof = 1;
1007         tomoyo_io_printf(head, "# select %s\n", data);
1008         if (domain && domain->is_deleted)
1009                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1010         return true;
1011 }
1012
1013 /**
1014  * tomoyo_delete_domain - Delete a domain.
1015  *
1016  * @domainname: The name of domain.
1017  *
1018  * Returns 0.
1019  *
1020  * Caller holds tomoyo_read_lock().
1021  */
1022 static int tomoyo_delete_domain(char *domainname)
1023 {
1024         struct tomoyo_domain_info *domain;
1025         struct tomoyo_path_info name;
1026
1027         name.name = domainname;
1028         tomoyo_fill_path_info(&name);
1029         if (mutex_lock_interruptible(&tomoyo_policy_lock))
1030                 return 0;
1031         /* Is there an active domain? */
1032         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1033                 /* Never delete tomoyo_kernel_domain */
1034                 if (domain == &tomoyo_kernel_domain)
1035                         continue;
1036                 if (domain->is_deleted ||
1037                     tomoyo_pathcmp(domain->domainname, &name))
1038                         continue;
1039                 domain->is_deleted = true;
1040                 break;
1041         }
1042         mutex_unlock(&tomoyo_policy_lock);
1043         return 0;
1044 }
1045
1046 /**
1047  * tomoyo_write_domain2 - Write domain policy.
1048  *
1049  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1050  * @list:      Pointer to "struct list_head".
1051  * @data:      Policy to be interpreted.
1052  * @is_delete: True if it is a delete request.
1053  *
1054  * Returns 0 on success, negative value otherwise.
1055  *
1056  * Caller holds tomoyo_read_lock().
1057  */
1058 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1059                                 struct list_head *list, char *data,
1060                                 const bool is_delete)
1061 {
1062         struct tomoyo_acl_param param = {
1063                 .ns = ns,
1064                 .list = list,
1065                 .data = data,
1066                 .is_delete = is_delete,
1067         };
1068         static const struct {
1069                 const char *keyword;
1070                 int (*write) (struct tomoyo_acl_param *);
1071         } tomoyo_callback[4] = {
1072                 { "file ", tomoyo_write_file },
1073                 { "network inet ", tomoyo_write_inet_network },
1074                 { "network unix ", tomoyo_write_unix_network },
1075                 { "misc ", tomoyo_write_misc },
1076         };
1077         u8 i;
1078
1079         for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1080                 if (!tomoyo_str_starts(&param.data,
1081                                        tomoyo_callback[i].keyword))
1082                         continue;
1083                 return tomoyo_callback[i].write(&param);
1084         }
1085         return -EINVAL;
1086 }
1087
1088 /* String table for domain flags. */
1089 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1090         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1091         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1092 };
1093
1094 /**
1095  * tomoyo_write_domain - Write domain policy.
1096  *
1097  * @head: Pointer to "struct tomoyo_io_buffer".
1098  *
1099  * Returns 0 on success, negative value otherwise.
1100  *
1101  * Caller holds tomoyo_read_lock().
1102  */
1103 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1104 {
1105         char *data = head->write_buf;
1106         struct tomoyo_policy_namespace *ns;
1107         struct tomoyo_domain_info *domain = head->w.domain;
1108         const bool is_delete = head->w.is_delete;
1109         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1110         unsigned int profile;
1111         if (*data == '<') {
1112                 domain = NULL;
1113                 if (is_delete)
1114                         tomoyo_delete_domain(data);
1115                 else if (is_select)
1116                         domain = tomoyo_find_domain(data);
1117                 else
1118                         domain = tomoyo_assign_domain(data, false);
1119                 head->w.domain = domain;
1120                 return 0;
1121         }
1122         if (!domain)
1123                 return -EINVAL;
1124         ns = domain->ns;
1125         if (sscanf(data, "use_profile %u", &profile) == 1
1126             && profile < TOMOYO_MAX_PROFILES) {
1127                 if (!tomoyo_policy_loaded || ns->profile_ptr[profile])
1128                         domain->profile = (u8) profile;
1129                 return 0;
1130         }
1131         if (sscanf(data, "use_group %u\n", &profile) == 1
1132             && profile < TOMOYO_MAX_ACL_GROUPS) {
1133                 if (!is_delete)
1134                         domain->group = (u8) profile;
1135                 return 0;
1136         }
1137         for (profile = 0; profile < TOMOYO_MAX_DOMAIN_INFO_FLAGS; profile++) {
1138                 const char *cp = tomoyo_dif[profile];
1139                 if (strncmp(data, cp, strlen(cp) - 1))
1140                         continue;
1141                 domain->flags[profile] = !is_delete;
1142                 return 0;
1143         }
1144         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1145                                     is_delete);
1146 }
1147
1148 /**
1149  * tomoyo_print_condition - Print condition part.
1150  *
1151  * @head: Pointer to "struct tomoyo_io_buffer".
1152  * @cond: Pointer to "struct tomoyo_condition".
1153  *
1154  * Returns true on success, false otherwise.
1155  */
1156 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1157                                    const struct tomoyo_condition *cond)
1158 {
1159         switch (head->r.cond_step) {
1160         case 0:
1161                 head->r.cond_index = 0;
1162                 head->r.cond_step++;
1163                 /* fall through */
1164         case 1:
1165                 {
1166                         const u16 condc = cond->condc;
1167                         const struct tomoyo_condition_element *condp =
1168                                 (typeof(condp)) (cond + 1);
1169                         const struct tomoyo_number_union *numbers_p =
1170                                 (typeof(numbers_p)) (condp + condc);
1171                         const struct tomoyo_name_union *names_p =
1172                                 (typeof(names_p))
1173                                 (numbers_p + cond->numbers_count);
1174                         const struct tomoyo_argv *argv =
1175                                 (typeof(argv)) (names_p + cond->names_count);
1176                         const struct tomoyo_envp *envp =
1177                                 (typeof(envp)) (argv + cond->argc);
1178                         u16 skip;
1179                         for (skip = 0; skip < head->r.cond_index; skip++) {
1180                                 const u8 left = condp->left;
1181                                 const u8 right = condp->right;
1182                                 condp++;
1183                                 switch (left) {
1184                                 case TOMOYO_ARGV_ENTRY:
1185                                         argv++;
1186                                         continue;
1187                                 case TOMOYO_ENVP_ENTRY:
1188                                         envp++;
1189                                         continue;
1190                                 case TOMOYO_NUMBER_UNION:
1191                                         numbers_p++;
1192                                         break;
1193                                 }
1194                                 switch (right) {
1195                                 case TOMOYO_NAME_UNION:
1196                                         names_p++;
1197                                         break;
1198                                 case TOMOYO_NUMBER_UNION:
1199                                         numbers_p++;
1200                                         break;
1201                                 }
1202                         }
1203                         while (head->r.cond_index < condc) {
1204                                 const u8 match = condp->equals;
1205                                 const u8 left = condp->left;
1206                                 const u8 right = condp->right;
1207                                 if (!tomoyo_flush(head))
1208                                         return false;
1209                                 condp++;
1210                                 head->r.cond_index++;
1211                                 tomoyo_set_space(head);
1212                                 switch (left) {
1213                                 case TOMOYO_ARGV_ENTRY:
1214                                         tomoyo_io_printf(head,
1215                                                          "exec.argv[%lu]%s=\"",
1216                                                          argv->index, argv->
1217                                                          is_not ? "!" : "");
1218                                         tomoyo_set_string(head,
1219                                                           argv->value->name);
1220                                         tomoyo_set_string(head, "\"");
1221                                         argv++;
1222                                         continue;
1223                                 case TOMOYO_ENVP_ENTRY:
1224                                         tomoyo_set_string(head,
1225                                                           "exec.envp[\"");
1226                                         tomoyo_set_string(head,
1227                                                           envp->name->name);
1228                                         tomoyo_io_printf(head, "\"]%s=", envp->
1229                                                          is_not ? "!" : "");
1230                                         if (envp->value) {
1231                                                 tomoyo_set_string(head, "\"");
1232                                                 tomoyo_set_string(head, envp->
1233                                                                   value->name);
1234                                                 tomoyo_set_string(head, "\"");
1235                                         } else {
1236                                                 tomoyo_set_string(head,
1237                                                                   "NULL");
1238                                         }
1239                                         envp++;
1240                                         continue;
1241                                 case TOMOYO_NUMBER_UNION:
1242                                         tomoyo_print_number_union_nospace
1243                                                 (head, numbers_p++);
1244                                         break;
1245                                 default:
1246                                         tomoyo_set_string(head,
1247                                                tomoyo_condition_keyword[left]);
1248                                         break;
1249                                 }
1250                                 tomoyo_set_string(head, match ? "=" : "!=");
1251                                 switch (right) {
1252                                 case TOMOYO_NAME_UNION:
1253                                         tomoyo_print_name_union_quoted
1254                                                 (head, names_p++);
1255                                         break;
1256                                 case TOMOYO_NUMBER_UNION:
1257                                         tomoyo_print_number_union_nospace
1258                                                 (head, numbers_p++);
1259                                         break;
1260                                 default:
1261                                         tomoyo_set_string(head,
1262                                           tomoyo_condition_keyword[right]);
1263                                         break;
1264                                 }
1265                         }
1266                 }
1267                 head->r.cond_step++;
1268                 /* fall through */
1269         case 2:
1270                 if (!tomoyo_flush(head))
1271                         break;
1272                 head->r.cond_step++;
1273                 /* fall through */
1274         case 3:
1275                 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1276                         tomoyo_io_printf(head, " grant_log=%s",
1277                                          tomoyo_yesno(cond->grant_log ==
1278                                                       TOMOYO_GRANTLOG_YES));
1279                 tomoyo_set_lf(head);
1280                 return true;
1281         }
1282         return false;
1283 }
1284
1285 /**
1286  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1287  *
1288  * @head:     Pointer to "struct tomoyo_io_buffer".
1289  * @category: Category name.
1290  *
1291  * Returns nothing.
1292  */
1293 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1294                              const char *category)
1295 {
1296         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1297                 tomoyo_print_namespace(head);
1298                 tomoyo_io_printf(head, "acl_group %u ",
1299                                  head->r.acl_group_index);
1300         }
1301         tomoyo_set_string(head, category);
1302 }
1303
1304 /**
1305  * tomoyo_print_entry - Print an ACL entry.
1306  *
1307  * @head: Pointer to "struct tomoyo_io_buffer".
1308  * @acl:  Pointer to an ACL entry.
1309  *
1310  * Returns true on success, false otherwise.
1311  */
1312 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1313                                struct tomoyo_acl_info *acl)
1314 {
1315         const u8 acl_type = acl->type;
1316         bool first = true;
1317         u8 bit;
1318
1319         if (head->r.print_cond_part)
1320                 goto print_cond_part;
1321         if (acl->is_deleted)
1322                 return true;
1323         if (!tomoyo_flush(head))
1324                 return false;
1325         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1326                 struct tomoyo_path_acl *ptr =
1327                         container_of(acl, typeof(*ptr), head);
1328                 const u16 perm = ptr->perm;
1329                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1330                         if (!(perm & (1 << bit)))
1331                                 continue;
1332                         if (head->r.print_transition_related_only &&
1333                             bit != TOMOYO_TYPE_EXECUTE)
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_path_keyword[bit]);
1342                 }
1343                 if (first)
1344                         return true;
1345                 tomoyo_print_name_union(head, &ptr->name);
1346         } else if (head->r.print_transition_related_only) {
1347                 return true;
1348         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1349                 struct tomoyo_path2_acl *ptr =
1350                         container_of(acl, typeof(*ptr), head);
1351                 const u8 perm = ptr->perm;
1352                 for (bit = 0; bit < TOMOYO_MAX_PATH2_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_pp2mac[bit]]);
1363                 }
1364                 if (first)
1365                         return true;
1366                 tomoyo_print_name_union(head, &ptr->name1);
1367                 tomoyo_print_name_union(head, &ptr->name2);
1368         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1369                 struct tomoyo_path_number_acl *ptr =
1370                         container_of(acl, typeof(*ptr), head);
1371                 const u8 perm = ptr->perm;
1372                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1373                         if (!(perm & (1 << bit)))
1374                                 continue;
1375                         if (first) {
1376                                 tomoyo_set_group(head, "file ");
1377                                 first = false;
1378                         } else {
1379                                 tomoyo_set_slash(head);
1380                         }
1381                         tomoyo_set_string(head, tomoyo_mac_keywords
1382                                           [tomoyo_pn2mac[bit]]);
1383                 }
1384                 if (first)
1385                         return true;
1386                 tomoyo_print_name_union(head, &ptr->name);
1387                 tomoyo_print_number_union(head, &ptr->number);
1388         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1389                 struct tomoyo_mkdev_acl *ptr =
1390                         container_of(acl, typeof(*ptr), head);
1391                 const u8 perm = ptr->perm;
1392                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1393                         if (!(perm & (1 << bit)))
1394                                 continue;
1395                         if (first) {
1396                                 tomoyo_set_group(head, "file ");
1397                                 first = false;
1398                         } else {
1399                                 tomoyo_set_slash(head);
1400                         }
1401                         tomoyo_set_string(head, tomoyo_mac_keywords
1402                                           [tomoyo_pnnn2mac[bit]]);
1403                 }
1404                 if (first)
1405                         return true;
1406                 tomoyo_print_name_union(head, &ptr->name);
1407                 tomoyo_print_number_union(head, &ptr->mode);
1408                 tomoyo_print_number_union(head, &ptr->major);
1409                 tomoyo_print_number_union(head, &ptr->minor);
1410         } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1411                 struct tomoyo_inet_acl *ptr =
1412                         container_of(acl, typeof(*ptr), head);
1413                 const u8 perm = ptr->perm;
1414
1415                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1416                         if (!(perm & (1 << bit)))
1417                                 continue;
1418                         if (first) {
1419                                 tomoyo_set_group(head, "network inet ");
1420                                 tomoyo_set_string(head, tomoyo_proto_keyword
1421                                                   [ptr->protocol]);
1422                                 tomoyo_set_space(head);
1423                                 first = false;
1424                         } else {
1425                                 tomoyo_set_slash(head);
1426                         }
1427                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1428                 }
1429                 if (first)
1430                         return true;
1431                 tomoyo_set_space(head);
1432                 if (ptr->address.group) {
1433                         tomoyo_set_string(head, "@");
1434                         tomoyo_set_string(head, ptr->address.group->group_name
1435                                           ->name);
1436                 } else {
1437                         char buf[128];
1438                         tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1439                         tomoyo_io_printf(head, "%s", buf);
1440                 }
1441                 tomoyo_print_number_union(head, &ptr->port);
1442         } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1443                 struct tomoyo_unix_acl *ptr =
1444                         container_of(acl, typeof(*ptr), head);
1445                 const u8 perm = ptr->perm;
1446
1447                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1448                         if (!(perm & (1 << bit)))
1449                                 continue;
1450                         if (first) {
1451                                 tomoyo_set_group(head, "network unix ");
1452                                 tomoyo_set_string(head, tomoyo_proto_keyword
1453                                                   [ptr->protocol]);
1454                                 tomoyo_set_space(head);
1455                                 first = false;
1456                         } else {
1457                                 tomoyo_set_slash(head);
1458                         }
1459                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1460                 }
1461                 if (first)
1462                         return true;
1463                 tomoyo_print_name_union(head, &ptr->name);
1464         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1465                 struct tomoyo_mount_acl *ptr =
1466                         container_of(acl, typeof(*ptr), head);
1467                 tomoyo_set_group(head, "file mount");
1468                 tomoyo_print_name_union(head, &ptr->dev_name);
1469                 tomoyo_print_name_union(head, &ptr->dir_name);
1470                 tomoyo_print_name_union(head, &ptr->fs_type);
1471                 tomoyo_print_number_union(head, &ptr->flags);
1472         } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1473                 struct tomoyo_env_acl *ptr =
1474                         container_of(acl, typeof(*ptr), head);
1475
1476                 tomoyo_set_group(head, "misc env ");
1477                 tomoyo_set_string(head, ptr->env->name);
1478         }
1479         if (acl->cond) {
1480                 head->r.print_cond_part = true;
1481                 head->r.cond_step = 0;
1482                 if (!tomoyo_flush(head))
1483                         return false;
1484 print_cond_part:
1485                 if (!tomoyo_print_condition(head, acl->cond))
1486                         return false;
1487                 head->r.print_cond_part = false;
1488         } else {
1489                 tomoyo_set_lf(head);
1490         }
1491         return true;
1492 }
1493
1494 /**
1495  * tomoyo_read_domain2 - Read domain policy.
1496  *
1497  * @head: Pointer to "struct tomoyo_io_buffer".
1498  * @list: Pointer to "struct list_head".
1499  *
1500  * Caller holds tomoyo_read_lock().
1501  *
1502  * Returns true on success, false otherwise.
1503  */
1504 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1505                                 struct list_head *list)
1506 {
1507         list_for_each_cookie(head->r.acl, list) {
1508                 struct tomoyo_acl_info *ptr =
1509                         list_entry(head->r.acl, typeof(*ptr), list);
1510                 if (!tomoyo_print_entry(head, ptr))
1511                         return false;
1512         }
1513         head->r.acl = NULL;
1514         return true;
1515 }
1516
1517 /**
1518  * tomoyo_read_domain - Read domain policy.
1519  *
1520  * @head: Pointer to "struct tomoyo_io_buffer".
1521  *
1522  * Caller holds tomoyo_read_lock().
1523  */
1524 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1525 {
1526         if (head->r.eof)
1527                 return;
1528         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1529                 struct tomoyo_domain_info *domain =
1530                         list_entry(head->r.domain, typeof(*domain), list);
1531                 switch (head->r.step) {
1532                         u8 i;
1533                 case 0:
1534                         if (domain->is_deleted &&
1535                             !head->r.print_this_domain_only)
1536                                 continue;
1537                         /* Print domainname and flags. */
1538                         tomoyo_set_string(head, domain->domainname->name);
1539                         tomoyo_set_lf(head);
1540                         tomoyo_io_printf(head, "use_profile %u\n",
1541                                          domain->profile);
1542                         tomoyo_io_printf(head, "use_group %u\n",
1543                                          domain->group);
1544                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1545                                 if (domain->flags[i])
1546                                         tomoyo_set_string(head, tomoyo_dif[i]);
1547                         head->r.step++;
1548                         tomoyo_set_lf(head);
1549                         /* fall through */
1550                 case 1:
1551                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1552                                 return;
1553                         head->r.step++;
1554                         if (!tomoyo_set_lf(head))
1555                                 return;
1556                         /* fall through */
1557                 case 2:
1558                         head->r.step = 0;
1559                         if (head->r.print_this_domain_only)
1560                                 goto done;
1561                 }
1562         }
1563  done:
1564         head->r.eof = true;
1565 }
1566
1567 /**
1568  * tomoyo_write_pid: Specify PID to obtain domainname.
1569  *
1570  * @head: Pointer to "struct tomoyo_io_buffer".
1571  *
1572  * Returns 0.
1573  */
1574 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1575 {
1576         head->r.eof = false;
1577         return 0;
1578 }
1579
1580 /**
1581  * tomoyo_read_pid - Get domainname of the specified PID.
1582  *
1583  * @head: Pointer to "struct tomoyo_io_buffer".
1584  *
1585  * Returns the domainname which the specified PID is in on success,
1586  * empty string otherwise.
1587  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1588  * using read()/write() interface rather than sysctl() interface.
1589  */
1590 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1591 {
1592         char *buf = head->write_buf;
1593         bool global_pid = false;
1594         unsigned int pid;
1595         struct task_struct *p;
1596         struct tomoyo_domain_info *domain = NULL;
1597
1598         /* Accessing write_buf is safe because head->io_sem is held. */
1599         if (!buf) {
1600                 head->r.eof = true;
1601                 return; /* Do nothing if open(O_RDONLY). */
1602         }
1603         if (head->r.w_pos || head->r.eof)
1604                 return;
1605         head->r.eof = true;
1606         if (tomoyo_str_starts(&buf, "global-pid "))
1607                 global_pid = true;
1608         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1609         rcu_read_lock();
1610         read_lock(&tasklist_lock);
1611         if (global_pid)
1612                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1613         else
1614                 p = find_task_by_vpid(pid);
1615         if (p)
1616                 domain = tomoyo_real_domain(p);
1617         read_unlock(&tasklist_lock);
1618         rcu_read_unlock();
1619         if (!domain)
1620                 return;
1621         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1622         tomoyo_set_string(head, domain->domainname->name);
1623 }
1624
1625 /* String table for domain transition control keywords. */
1626 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1627         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1628         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1629         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1630         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1631         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1632         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1633 };
1634
1635 /* String table for grouping keywords. */
1636 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1637         [TOMOYO_PATH_GROUP]    = "path_group ",
1638         [TOMOYO_NUMBER_GROUP]  = "number_group ",
1639         [TOMOYO_ADDRESS_GROUP] = "address_group ",
1640 };
1641
1642 /**
1643  * tomoyo_write_exception - Write exception policy.
1644  *
1645  * @head: Pointer to "struct tomoyo_io_buffer".
1646  *
1647  * Returns 0 on success, negative value otherwise.
1648  *
1649  * Caller holds tomoyo_read_lock().
1650  */
1651 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1652 {
1653         const bool is_delete = head->w.is_delete;
1654         struct tomoyo_acl_param param = {
1655                 .ns = head->w.ns,
1656                 .is_delete = is_delete,
1657                 .data = head->write_buf,
1658         };
1659         u8 i;
1660         if (tomoyo_str_starts(&param.data, "aggregator "))
1661                 return tomoyo_write_aggregator(&param);
1662         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1663                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1664                         return tomoyo_write_transition_control(&param, i);
1665         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1666                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1667                         return tomoyo_write_group(&param, i);
1668         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1669                 unsigned int group;
1670                 char *data;
1671                 group = simple_strtoul(param.data, &data, 10);
1672                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1673                         return tomoyo_write_domain2
1674                                 (head->w.ns, &head->w.ns->acl_group[group],
1675                                  data, is_delete);
1676         }
1677         return -EINVAL;
1678 }
1679
1680 /**
1681  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1682  *
1683  * @head: Pointer to "struct tomoyo_io_buffer".
1684  * @idx:  Index number.
1685  *
1686  * Returns true on success, false otherwise.
1687  *
1688  * Caller holds tomoyo_read_lock().
1689  */
1690 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1691 {
1692         struct tomoyo_policy_namespace *ns =
1693                 container_of(head->r.ns, typeof(*ns), namespace_list);
1694         struct list_head *list = &ns->group_list[idx];
1695         list_for_each_cookie(head->r.group, list) {
1696                 struct tomoyo_group *group =
1697                         list_entry(head->r.group, typeof(*group), head.list);
1698                 list_for_each_cookie(head->r.acl, &group->member_list) {
1699                         struct tomoyo_acl_head *ptr =
1700                                 list_entry(head->r.acl, typeof(*ptr), list);
1701                         if (ptr->is_deleted)
1702                                 continue;
1703                         if (!tomoyo_flush(head))
1704                                 return false;
1705                         tomoyo_print_namespace(head);
1706                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1707                         tomoyo_set_string(head, group->group_name->name);
1708                         if (idx == TOMOYO_PATH_GROUP) {
1709                                 tomoyo_set_space(head);
1710                                 tomoyo_set_string(head, container_of
1711                                                (ptr, struct tomoyo_path_group,
1712                                                 head)->member_name->name);
1713                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1714                                 tomoyo_print_number_union(head, &container_of
1715                                                           (ptr,
1716                                                    struct tomoyo_number_group,
1717                                                            head)->number);
1718                         } else if (idx == TOMOYO_ADDRESS_GROUP) {
1719                                 char buffer[128];
1720
1721                                 struct tomoyo_address_group *member =
1722                                         container_of(ptr, typeof(*member),
1723                                                      head);
1724                                 tomoyo_print_ip(buffer, sizeof(buffer),
1725                                                 &member->address);
1726                                 tomoyo_io_printf(head, " %s", buffer);
1727                         }
1728                         tomoyo_set_lf(head);
1729                 }
1730                 head->r.acl = NULL;
1731         }
1732         head->r.group = NULL;
1733         return true;
1734 }
1735
1736 /**
1737  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1738  *
1739  * @head: Pointer to "struct tomoyo_io_buffer".
1740  * @idx:  Index number.
1741  *
1742  * Returns true on success, false otherwise.
1743  *
1744  * Caller holds tomoyo_read_lock().
1745  */
1746 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1747 {
1748         struct tomoyo_policy_namespace *ns =
1749                 container_of(head->r.ns, typeof(*ns), namespace_list);
1750         struct list_head *list = &ns->policy_list[idx];
1751         list_for_each_cookie(head->r.acl, list) {
1752                 struct tomoyo_acl_head *acl =
1753                         container_of(head->r.acl, typeof(*acl), list);
1754                 if (acl->is_deleted)
1755                         continue;
1756                 if (!tomoyo_flush(head))
1757                         return false;
1758                 switch (idx) {
1759                 case TOMOYO_ID_TRANSITION_CONTROL:
1760                         {
1761                                 struct tomoyo_transition_control *ptr =
1762                                         container_of(acl, typeof(*ptr), head);
1763                                 tomoyo_print_namespace(head);
1764                                 tomoyo_set_string(head, tomoyo_transition_type
1765                                                   [ptr->type]);
1766                                 tomoyo_set_string(head, ptr->program ?
1767                                                   ptr->program->name : "any");
1768                                 tomoyo_set_string(head, " from ");
1769                                 tomoyo_set_string(head, ptr->domainname ?
1770                                                   ptr->domainname->name :
1771                                                   "any");
1772                         }
1773                         break;
1774                 case TOMOYO_ID_AGGREGATOR:
1775                         {
1776                                 struct tomoyo_aggregator *ptr =
1777                                         container_of(acl, typeof(*ptr), head);
1778                                 tomoyo_print_namespace(head);
1779                                 tomoyo_set_string(head, "aggregator ");
1780                                 tomoyo_set_string(head,
1781                                                   ptr->original_name->name);
1782                                 tomoyo_set_space(head);
1783                                 tomoyo_set_string(head,
1784                                                ptr->aggregated_name->name);
1785                         }
1786                         break;
1787                 default:
1788                         continue;
1789                 }
1790                 tomoyo_set_lf(head);
1791         }
1792         head->r.acl = NULL;
1793         return true;
1794 }
1795
1796 /**
1797  * tomoyo_read_exception - Read exception policy.
1798  *
1799  * @head: Pointer to "struct tomoyo_io_buffer".
1800  *
1801  * Caller holds tomoyo_read_lock().
1802  */
1803 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1804 {
1805         struct tomoyo_policy_namespace *ns =
1806                 container_of(head->r.ns, typeof(*ns), namespace_list);
1807         if (head->r.eof)
1808                 return;
1809         while (head->r.step < TOMOYO_MAX_POLICY &&
1810                tomoyo_read_policy(head, head->r.step))
1811                 head->r.step++;
1812         if (head->r.step < TOMOYO_MAX_POLICY)
1813                 return;
1814         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1815                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1816                 head->r.step++;
1817         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1818                 return;
1819         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1820                + TOMOYO_MAX_ACL_GROUPS) {
1821                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1822                         - TOMOYO_MAX_GROUP;
1823                 if (!tomoyo_read_domain2(head, &ns->acl_group
1824                                          [head->r.acl_group_index]))
1825                         return;
1826                 head->r.step++;
1827         }
1828         head->r.eof = true;
1829 }
1830
1831 /* Wait queue for kernel -> userspace notification. */
1832 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1833 /* Wait queue for userspace -> kernel notification. */
1834 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1835
1836 /* Structure for query. */
1837 struct tomoyo_query {
1838         struct list_head list;
1839         char *query;
1840         size_t query_len;
1841         unsigned int serial;
1842         u8 timer;
1843         u8 answer;
1844         u8 retry;
1845 };
1846
1847 /* The list for "struct tomoyo_query". */
1848 static LIST_HEAD(tomoyo_query_list);
1849
1850 /* Lock for manipulating tomoyo_query_list. */
1851 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1852
1853 /*
1854  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1855  * interface.
1856  */
1857 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1858
1859 /**
1860  * tomoyo_truncate - Truncate a line.
1861  *
1862  * @str: String to truncate.
1863  *
1864  * Returns length of truncated @str.
1865  */
1866 static int tomoyo_truncate(char *str)
1867 {
1868         char *start = str;
1869         while (*(unsigned char *) str > (unsigned char) ' ')
1870                 str++;
1871         *str = '\0';
1872         return strlen(start) + 1;
1873 }
1874
1875 /**
1876  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1877  *
1878  * @domain: Pointer to "struct tomoyo_domain_info".
1879  * @header: Lines containing ACL.
1880  *
1881  * Returns nothing.
1882  */
1883 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1884 {
1885         char *buffer;
1886         char *realpath = NULL;
1887         char *argv0 = NULL;
1888         char *symlink = NULL;
1889         char *cp = strchr(header, '\n');
1890         int len;
1891         if (!cp)
1892                 return;
1893         cp = strchr(cp + 1, '\n');
1894         if (!cp)
1895                 return;
1896         *cp++ = '\0';
1897         len = strlen(cp) + 1;
1898         /* strstr() will return NULL if ordering is wrong. */
1899         if (*cp == 'f') {
1900                 argv0 = strstr(header, " argv[]={ \"");
1901                 if (argv0) {
1902                         argv0 += 10;
1903                         len += tomoyo_truncate(argv0) + 14;
1904                 }
1905                 realpath = strstr(header, " exec={ realpath=\"");
1906                 if (realpath) {
1907                         realpath += 8;
1908                         len += tomoyo_truncate(realpath) + 6;
1909                 }
1910                 symlink = strstr(header, " symlink.target=\"");
1911                 if (symlink)
1912                         len += tomoyo_truncate(symlink + 1) + 1;
1913         }
1914         buffer = kmalloc(len, GFP_NOFS);
1915         if (!buffer)
1916                 return;
1917         snprintf(buffer, len - 1, "%s", cp);
1918         if (realpath)
1919                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
1920         if (argv0)
1921                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
1922         if (symlink)
1923                 tomoyo_addprintf(buffer, len, "%s", symlink);
1924         tomoyo_normalize_line(buffer);
1925         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
1926                                   false))
1927                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
1928         kfree(buffer);
1929 }
1930
1931 /**
1932  * tomoyo_supervisor - Ask for the supervisor's decision.
1933  *
1934  * @r:   Pointer to "struct tomoyo_request_info".
1935  * @fmt: The printf()'s format string, followed by parameters.
1936  *
1937  * Returns 0 if the supervisor decided to permit the access request which
1938  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1939  * supervisor decided to retry the access request which violated the policy in
1940  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1941  */
1942 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1943 {
1944         va_list args;
1945         int error;
1946         int len;
1947         static unsigned int tomoyo_serial;
1948         struct tomoyo_query entry = { };
1949         bool quota_exceeded = false;
1950         va_start(args, fmt);
1951         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
1952         va_end(args);
1953         /* Write /sys/kernel/security/tomoyo/audit. */
1954         va_start(args, fmt);
1955         tomoyo_write_log2(r, len, fmt, args);
1956         va_end(args);
1957         /* Nothing more to do if granted. */
1958         if (r->granted)
1959                 return 0;
1960         if (r->mode)
1961                 tomoyo_update_stat(r->mode);
1962         switch (r->mode) {
1963         case TOMOYO_CONFIG_ENFORCING:
1964                 error = -EPERM;
1965                 if (atomic_read(&tomoyo_query_observers))
1966                         break;
1967                 goto out;
1968         case TOMOYO_CONFIG_LEARNING:
1969                 error = 0;
1970                 /* Check max_learning_entry parameter. */
1971                 if (tomoyo_domain_quota_is_ok(r))
1972                         break;
1973                 /* fall through */
1974         default:
1975                 return 0;
1976         }
1977         /* Get message. */
1978         va_start(args, fmt);
1979         entry.query = tomoyo_init_log(r, len, fmt, args);
1980         va_end(args);
1981         if (!entry.query)
1982                 goto out;
1983         entry.query_len = strlen(entry.query) + 1;
1984         if (!error) {
1985                 tomoyo_add_entry(r->domain, entry.query);
1986                 goto out;
1987         }
1988         len = tomoyo_round2(entry.query_len);
1989         spin_lock(&tomoyo_query_list_lock);
1990         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
1991             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
1992             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
1993                 quota_exceeded = true;
1994         } else {
1995                 entry.serial = tomoyo_serial++;
1996                 entry.retry = r->retry;
1997                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
1998                 list_add_tail(&entry.list, &tomoyo_query_list);
1999         }
2000         spin_unlock(&tomoyo_query_list_lock);
2001         if (quota_exceeded)
2002                 goto out;
2003         /* Give 10 seconds for supervisor's opinion. */
2004         while (entry.timer < 10) {
2005                 wake_up_all(&tomoyo_query_wait);
2006                 if (wait_event_interruptible_timeout
2007                     (tomoyo_answer_wait, entry.answer ||
2008                      !atomic_read(&tomoyo_query_observers), HZ))
2009                         break;
2010                 else
2011                         entry.timer++;
2012         }
2013         spin_lock(&tomoyo_query_list_lock);
2014         list_del(&entry.list);
2015         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2016         spin_unlock(&tomoyo_query_list_lock);
2017         switch (entry.answer) {
2018         case 3: /* Asked to retry by administrator. */
2019                 error = TOMOYO_RETRY_REQUEST;
2020                 r->retry++;
2021                 break;
2022         case 1:
2023                 /* Granted by administrator. */
2024                 error = 0;
2025                 break;
2026         default:
2027                 /* Timed out or rejected by administrator. */
2028                 break;
2029         }
2030 out:
2031         kfree(entry.query);
2032         return error;
2033 }
2034
2035 /**
2036  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2037  *
2038  * @file: Pointer to "struct file".
2039  * @wait: Pointer to "poll_table".
2040  *
2041  * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
2042  *
2043  * Waits for access requests which violated policy in enforcing mode.
2044  */
2045 static int tomoyo_poll_query(struct file *file, poll_table *wait)
2046 {
2047         struct list_head *tmp;
2048         bool found = false;
2049         u8 i;
2050         for (i = 0; i < 2; i++) {
2051                 spin_lock(&tomoyo_query_list_lock);
2052                 list_for_each(tmp, &tomoyo_query_list) {
2053                         struct tomoyo_query *ptr =
2054                                 list_entry(tmp, typeof(*ptr), list);
2055                         if (ptr->answer)
2056                                 continue;
2057                         found = true;
2058                         break;
2059                 }
2060                 spin_unlock(&tomoyo_query_list_lock);
2061                 if (found)
2062                         return POLLIN | POLLRDNORM;
2063                 if (i)
2064                         break;
2065                 poll_wait(file, &tomoyo_query_wait, wait);
2066         }
2067         return 0;
2068 }
2069
2070 /**
2071  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2072  *
2073  * @head: Pointer to "struct tomoyo_io_buffer".
2074  */
2075 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2076 {
2077         struct list_head *tmp;
2078         unsigned int pos = 0;
2079         size_t len = 0;
2080         char *buf;
2081         if (head->r.w_pos)
2082                 return;
2083         if (head->read_buf) {
2084                 kfree(head->read_buf);
2085                 head->read_buf = NULL;
2086         }
2087         spin_lock(&tomoyo_query_list_lock);
2088         list_for_each(tmp, &tomoyo_query_list) {
2089                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2090                 if (ptr->answer)
2091                         continue;
2092                 if (pos++ != head->r.query_index)
2093                         continue;
2094                 len = ptr->query_len;
2095                 break;
2096         }
2097         spin_unlock(&tomoyo_query_list_lock);
2098         if (!len) {
2099                 head->r.query_index = 0;
2100                 return;
2101         }
2102         buf = kzalloc(len + 32, GFP_NOFS);
2103         if (!buf)
2104                 return;
2105         pos = 0;
2106         spin_lock(&tomoyo_query_list_lock);
2107         list_for_each(tmp, &tomoyo_query_list) {
2108                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2109                 if (ptr->answer)
2110                         continue;
2111                 if (pos++ != head->r.query_index)
2112                         continue;
2113                 /*
2114                  * Some query can be skipped because tomoyo_query_list
2115                  * can change, but I don't care.
2116                  */
2117                 if (len == ptr->query_len)
2118                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2119                                  ptr->retry, ptr->query);
2120                 break;
2121         }
2122         spin_unlock(&tomoyo_query_list_lock);
2123         if (buf[0]) {
2124                 head->read_buf = buf;
2125                 head->r.w[head->r.w_pos++] = buf;
2126                 head->r.query_index++;
2127         } else {
2128                 kfree(buf);
2129         }
2130 }
2131
2132 /**
2133  * tomoyo_write_answer - Write the supervisor's decision.
2134  *
2135  * @head: Pointer to "struct tomoyo_io_buffer".
2136  *
2137  * Returns 0 on success, -EINVAL otherwise.
2138  */
2139 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2140 {
2141         char *data = head->write_buf;
2142         struct list_head *tmp;
2143         unsigned int serial;
2144         unsigned int answer;
2145         spin_lock(&tomoyo_query_list_lock);
2146         list_for_each(tmp, &tomoyo_query_list) {
2147                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2148                 ptr->timer = 0;
2149         }
2150         spin_unlock(&tomoyo_query_list_lock);
2151         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2152                 return -EINVAL;
2153         spin_lock(&tomoyo_query_list_lock);
2154         list_for_each(tmp, &tomoyo_query_list) {
2155                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2156                 if (ptr->serial != serial)
2157                         continue;
2158                 if (!ptr->answer)
2159                         ptr->answer = answer;
2160                 break;
2161         }
2162         spin_unlock(&tomoyo_query_list_lock);
2163         return 0;
2164 }
2165
2166 /**
2167  * tomoyo_read_version: Get version.
2168  *
2169  * @head: Pointer to "struct tomoyo_io_buffer".
2170  *
2171  * Returns version information.
2172  */
2173 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2174 {
2175         if (!head->r.eof) {
2176                 tomoyo_io_printf(head, "2.4.0");
2177                 head->r.eof = true;
2178         }
2179 }
2180
2181 /**
2182  * tomoyo_read_self_domain - Get the current process's domainname.
2183  *
2184  * @head: Pointer to "struct tomoyo_io_buffer".
2185  *
2186  * Returns the current process's domainname.
2187  */
2188 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
2189 {
2190         if (!head->r.eof) {
2191                 /*
2192                  * tomoyo_domain()->domainname != NULL
2193                  * because every process belongs to a domain and
2194                  * the domain's name cannot be NULL.
2195                  */
2196                 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
2197                 head->r.eof = true;
2198         }
2199 }
2200
2201 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2202 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2203         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2204         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2205         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2206         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2207 };
2208
2209 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2210 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2211         [TOMOYO_MEMORY_POLICY] = "policy:",
2212         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2213         [TOMOYO_MEMORY_QUERY]  = "query message:",
2214 };
2215
2216 /* Timestamp counter for last updated. */
2217 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2218 /* Counter for number of updates. */
2219 static unsigned int tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2220
2221 /**
2222  * tomoyo_update_stat - Update statistic counters.
2223  *
2224  * @index: Index for policy type.
2225  *
2226  * Returns nothing.
2227  */
2228 void tomoyo_update_stat(const u8 index)
2229 {
2230         struct timeval tv;
2231         do_gettimeofday(&tv);
2232         /*
2233          * I don't use atomic operations because race condition is not fatal.
2234          */
2235         tomoyo_stat_updated[index]++;
2236         tomoyo_stat_modified[index] = tv.tv_sec;
2237 }
2238
2239 /**
2240  * tomoyo_read_stat - Read statistic data.
2241  *
2242  * @head: Pointer to "struct tomoyo_io_buffer".
2243  *
2244  * Returns nothing.
2245  */
2246 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2247 {
2248         u8 i;
2249         unsigned int total = 0;
2250         if (head->r.eof)
2251                 return;
2252         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2253                 tomoyo_io_printf(head, "Policy %-30s %10u",
2254                                  tomoyo_policy_headers[i],
2255                                  tomoyo_stat_updated[i]);
2256                 if (tomoyo_stat_modified[i]) {
2257                         struct tomoyo_time stamp;
2258                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2259                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u "
2260                                          "%02u:%02u:%02u)",
2261                                          stamp.year, stamp.month, stamp.day,
2262                                          stamp.hour, stamp.min, stamp.sec);
2263                 }
2264                 tomoyo_set_lf(head);
2265         }
2266         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2267                 unsigned int used = tomoyo_memory_used[i];
2268                 total += used;
2269                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2270                                  tomoyo_memory_headers[i], used);
2271                 used = tomoyo_memory_quota[i];
2272                 if (used)
2273                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2274                 tomoyo_set_lf(head);
2275         }
2276         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2277                          total);
2278         head->r.eof = true;
2279 }
2280
2281 /**
2282  * tomoyo_write_stat - Set memory quota.
2283  *
2284  * @head: Pointer to "struct tomoyo_io_buffer".
2285  *
2286  * Returns 0.
2287  */
2288 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2289 {
2290         char *data = head->write_buf;
2291         u8 i;
2292         if (tomoyo_str_starts(&data, "Memory used by "))
2293                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2294                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2295                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2296         return 0;
2297 }
2298
2299 /**
2300  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2301  *
2302  * @type: Type of interface.
2303  * @file: Pointer to "struct file".
2304  *
2305  * Returns 0 on success, negative value otherwise.
2306  */
2307 int tomoyo_open_control(const u8 type, struct file *file)
2308 {
2309         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2310
2311         if (!head)
2312                 return -ENOMEM;
2313         mutex_init(&head->io_sem);
2314         head->type = type;
2315         switch (type) {
2316         case TOMOYO_DOMAINPOLICY:
2317                 /* /sys/kernel/security/tomoyo/domain_policy */
2318                 head->write = tomoyo_write_domain;
2319                 head->read = tomoyo_read_domain;
2320                 break;
2321         case TOMOYO_EXCEPTIONPOLICY:
2322                 /* /sys/kernel/security/tomoyo/exception_policy */
2323                 head->write = tomoyo_write_exception;
2324                 head->read = tomoyo_read_exception;
2325                 break;
2326         case TOMOYO_AUDIT:
2327                 /* /sys/kernel/security/tomoyo/audit */
2328                 head->poll = tomoyo_poll_log;
2329                 head->read = tomoyo_read_log;
2330                 break;
2331         case TOMOYO_SELFDOMAIN:
2332                 /* /sys/kernel/security/tomoyo/self_domain */
2333                 head->read = tomoyo_read_self_domain;
2334                 break;
2335         case TOMOYO_PROCESS_STATUS:
2336                 /* /sys/kernel/security/tomoyo/.process_status */
2337                 head->write = tomoyo_write_pid;
2338                 head->read = tomoyo_read_pid;
2339                 break;
2340         case TOMOYO_VERSION:
2341                 /* /sys/kernel/security/tomoyo/version */
2342                 head->read = tomoyo_read_version;
2343                 head->readbuf_size = 128;
2344                 break;
2345         case TOMOYO_STAT:
2346                 /* /sys/kernel/security/tomoyo/stat */
2347                 head->write = tomoyo_write_stat;
2348                 head->read = tomoyo_read_stat;
2349                 head->readbuf_size = 1024;
2350                 break;
2351         case TOMOYO_PROFILE:
2352                 /* /sys/kernel/security/tomoyo/profile */
2353                 head->write = tomoyo_write_profile;
2354                 head->read = tomoyo_read_profile;
2355                 break;
2356         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2357                 head->poll = tomoyo_poll_query;
2358                 head->write = tomoyo_write_answer;
2359                 head->read = tomoyo_read_query;
2360                 break;
2361         case TOMOYO_MANAGER:
2362                 /* /sys/kernel/security/tomoyo/manager */
2363                 head->write = tomoyo_write_manager;
2364                 head->read = tomoyo_read_manager;
2365                 break;
2366         }
2367         if (!(file->f_mode & FMODE_READ)) {
2368                 /*
2369                  * No need to allocate read_buf since it is not opened
2370                  * for reading.
2371                  */
2372                 head->read = NULL;
2373                 head->poll = NULL;
2374         } else if (!head->poll) {
2375                 /* Don't allocate read_buf for poll() access. */
2376                 if (!head->readbuf_size)
2377                         head->readbuf_size = 4096 * 2;
2378                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2379                 if (!head->read_buf) {
2380                         kfree(head);
2381                         return -ENOMEM;
2382                 }
2383         }
2384         if (!(file->f_mode & FMODE_WRITE)) {
2385                 /*
2386                  * No need to allocate write_buf since it is not opened
2387                  * for writing.
2388                  */
2389                 head->write = NULL;
2390         } else if (head->write) {
2391                 head->writebuf_size = 4096 * 2;
2392                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2393                 if (!head->write_buf) {
2394                         kfree(head->read_buf);
2395                         kfree(head);
2396                         return -ENOMEM;
2397                 }
2398         }
2399         /*
2400          * If the file is /sys/kernel/security/tomoyo/query , increment the
2401          * observer counter.
2402          * The obserber counter is used by tomoyo_supervisor() to see if
2403          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2404          */
2405         if (type == TOMOYO_QUERY)
2406                 atomic_inc(&tomoyo_query_observers);
2407         file->private_data = head;
2408         tomoyo_notify_gc(head, true);
2409         return 0;
2410 }
2411
2412 /**
2413  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2414  *
2415  * @file: Pointer to "struct file".
2416  * @wait: Pointer to "poll_table".
2417  *
2418  * Waits for read readiness.
2419  * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd and
2420  * /sys/kernel/security/tomoyo/audit is handled by /usr/sbin/tomoyo-auditd.
2421  */
2422 int tomoyo_poll_control(struct file *file, poll_table *wait)
2423 {
2424         struct tomoyo_io_buffer *head = file->private_data;
2425         if (!head->poll)
2426                 return -ENOSYS;
2427         return head->poll(file, wait);
2428 }
2429
2430 /**
2431  * tomoyo_set_namespace_cursor - Set namespace to read.
2432  *
2433  * @head: Pointer to "struct tomoyo_io_buffer".
2434  *
2435  * Returns nothing.
2436  */
2437 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2438 {
2439         struct list_head *ns;
2440         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2441             head->type != TOMOYO_PROFILE)
2442                 return;
2443         /*
2444          * If this is the first read, or reading previous namespace finished
2445          * and has more namespaces to read, update the namespace cursor.
2446          */
2447         ns = head->r.ns;
2448         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2449                 /* Clearing is OK because tomoyo_flush() returned true. */
2450                 memset(&head->r, 0, sizeof(head->r));
2451                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2452         }
2453 }
2454
2455 /**
2456  * tomoyo_has_more_namespace - Check for unread namespaces.
2457  *
2458  * @head: Pointer to "struct tomoyo_io_buffer".
2459  *
2460  * Returns true if we have more entries to print, false otherwise.
2461  */
2462 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2463 {
2464         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2465                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2466                 head->r.ns->next != &tomoyo_namespace_list;
2467 }
2468
2469 /**
2470  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2471  *
2472  * @head:       Pointer to "struct tomoyo_io_buffer".
2473  * @buffer:     Poiner to buffer to write to.
2474  * @buffer_len: Size of @buffer.
2475  *
2476  * Returns bytes read on success, negative value otherwise.
2477  */
2478 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2479                             const int buffer_len)
2480 {
2481         int len;
2482         int idx;
2483
2484         if (!head->read)
2485                 return -ENOSYS;
2486         if (mutex_lock_interruptible(&head->io_sem))
2487                 return -EINTR;
2488         head->read_user_buf = buffer;
2489         head->read_user_buf_avail = buffer_len;
2490         idx = tomoyo_read_lock();
2491         if (tomoyo_flush(head))
2492                 /* Call the policy handler. */
2493                 do {
2494                         tomoyo_set_namespace_cursor(head);
2495                         head->read(head);
2496                 } while (tomoyo_flush(head) &&
2497                          tomoyo_has_more_namespace(head));
2498         tomoyo_read_unlock(idx);
2499         len = head->read_user_buf - buffer;
2500         mutex_unlock(&head->io_sem);
2501         return len;
2502 }
2503
2504 /**
2505  * tomoyo_parse_policy - Parse a policy line.
2506  *
2507  * @head: Poiter to "struct tomoyo_io_buffer".
2508  * @line: Line to parse.
2509  *
2510  * Returns 0 on success, negative value otherwise.
2511  *
2512  * Caller holds tomoyo_read_lock().
2513  */
2514 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2515 {
2516         /* Delete request? */
2517         head->w.is_delete = !strncmp(line, "delete ", 7);
2518         if (head->w.is_delete)
2519                 memmove(line, line + 7, strlen(line + 7) + 1);
2520         /* Selecting namespace to update. */
2521         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2522             head->type == TOMOYO_PROFILE) {
2523                 if (*line == '<') {
2524                         char *cp = strchr(line, ' ');
2525                         if (cp) {
2526                                 *cp++ = '\0';
2527                                 head->w.ns = tomoyo_assign_namespace(line);
2528                                 memmove(line, cp, strlen(cp) + 1);
2529                         } else
2530                                 head->w.ns = NULL;
2531                 } else
2532                         head->w.ns = &tomoyo_kernel_namespace;
2533                 /* Don't allow updating if namespace is invalid. */
2534                 if (!head->w.ns)
2535                         return -ENOENT;
2536         }
2537         /* Do the update. */
2538         return head->write(head);
2539 }
2540
2541 /**
2542  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2543  *
2544  * @head:       Pointer to "struct tomoyo_io_buffer".
2545  * @buffer:     Pointer to buffer to read from.
2546  * @buffer_len: Size of @buffer.
2547  *
2548  * Returns @buffer_len on success, negative value otherwise.
2549  */
2550 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2551                              const char __user *buffer, const int buffer_len)
2552 {
2553         int error = buffer_len;
2554         size_t avail_len = buffer_len;
2555         char *cp0 = head->write_buf;
2556         int idx;
2557         if (!head->write)
2558                 return -ENOSYS;
2559         if (!access_ok(VERIFY_READ, buffer, buffer_len))
2560                 return -EFAULT;
2561         if (mutex_lock_interruptible(&head->io_sem))
2562                 return -EINTR;
2563         idx = tomoyo_read_lock();
2564         /* Read a line and dispatch it to the policy handler. */
2565         while (avail_len > 0) {
2566                 char c;
2567                 if (head->w.avail >= head->writebuf_size - 1) {
2568                         const int len = head->writebuf_size * 2;
2569                         char *cp = kzalloc(len, GFP_NOFS);
2570                         if (!cp) {
2571                                 error = -ENOMEM;
2572                                 break;
2573                         }
2574                         memmove(cp, cp0, head->w.avail);
2575                         kfree(cp0);
2576                         head->write_buf = cp;
2577                         cp0 = cp;
2578                         head->writebuf_size = len;
2579                 }
2580                 if (get_user(c, buffer)) {
2581                         error = -EFAULT;
2582                         break;
2583                 }
2584                 buffer++;
2585                 avail_len--;
2586                 cp0[head->w.avail++] = c;
2587                 if (c != '\n')
2588                         continue;
2589                 cp0[head->w.avail - 1] = '\0';
2590                 head->w.avail = 0;
2591                 tomoyo_normalize_line(cp0);
2592                 if (!strcmp(cp0, "reset")) {
2593                         head->w.ns = &tomoyo_kernel_namespace;
2594                         head->w.domain = NULL;
2595                         memset(&head->r, 0, sizeof(head->r));
2596                         continue;
2597                 }
2598                 /* Don't allow updating policies by non manager programs. */
2599                 switch (head->type) {
2600                 case TOMOYO_PROCESS_STATUS:
2601                         /* This does not write anything. */
2602                         break;
2603                 case TOMOYO_DOMAINPOLICY:
2604                         if (tomoyo_select_domain(head, cp0))
2605                                 continue;
2606                         /* fall through */
2607                 case TOMOYO_EXCEPTIONPOLICY:
2608                         if (!strcmp(cp0, "select transition_only")) {
2609                                 head->r.print_transition_related_only = true;
2610                                 continue;
2611                         }
2612                         /* fall through */
2613                 default:
2614                         if (!tomoyo_manager()) {
2615                                 error = -EPERM;
2616                                 goto out;
2617                         }
2618                 }
2619                 switch (tomoyo_parse_policy(head, cp0)) {
2620                 case -EPERM:
2621                         error = -EPERM;
2622                         goto out;
2623                 case 0:
2624                         switch (head->type) {
2625                         case TOMOYO_DOMAINPOLICY:
2626                         case TOMOYO_EXCEPTIONPOLICY:
2627                         case TOMOYO_STAT:
2628                         case TOMOYO_PROFILE:
2629                         case TOMOYO_MANAGER:
2630                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2631                                 break;
2632                         default:
2633                                 break;
2634                         }
2635                         break;
2636                 }
2637         }
2638 out:
2639         tomoyo_read_unlock(idx);
2640         mutex_unlock(&head->io_sem);
2641         return error;
2642 }
2643
2644 /**
2645  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2646  *
2647  * @head: Pointer to "struct tomoyo_io_buffer".
2648  *
2649  * Returns 0.
2650  */
2651 int tomoyo_close_control(struct tomoyo_io_buffer *head)
2652 {
2653         /*
2654          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2655          * observer counter.
2656          */
2657         if (head->type == TOMOYO_QUERY &&
2658             atomic_dec_and_test(&tomoyo_query_observers))
2659                 wake_up_all(&tomoyo_answer_wait);
2660         tomoyo_notify_gc(head, false);
2661         return 0;
2662 }
2663
2664 /**
2665  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2666  */
2667 void tomoyo_check_profile(void)
2668 {
2669         struct tomoyo_domain_info *domain;
2670         const int idx = tomoyo_read_lock();
2671         tomoyo_policy_loaded = true;
2672         printk(KERN_INFO "TOMOYO: 2.4.0\n");
2673         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2674                 const u8 profile = domain->profile;
2675                 const struct tomoyo_policy_namespace *ns = domain->ns;
2676                 if (ns->profile_version != 20100903)
2677                         printk(KERN_ERR
2678                                "Profile version %u is not supported.\n",
2679                                ns->profile_version);
2680                 else if (!ns->profile_ptr[profile])
2681                         printk(KERN_ERR
2682                                "Profile %u (used by '%s') is not defined.\n",
2683                                profile, domain->domainname->name);
2684                 else
2685                         continue;
2686                 printk(KERN_ERR
2687                        "Userland tools for TOMOYO 2.4 must be installed and "
2688                        "policy must be initialized.\n");
2689                 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.4/ "
2690                        "for more information.\n");
2691                 panic("STOP!");
2692         }
2693         tomoyo_read_unlock(idx);
2694         printk(KERN_INFO "Mandatory Access Control activated.\n");
2695 }
2696
2697 /**
2698  * tomoyo_load_builtin_policy - Load built-in policy.
2699  *
2700  * Returns nothing.
2701  */
2702 void __init tomoyo_load_builtin_policy(void)
2703 {
2704         /*
2705          * This include file is manually created and contains built-in policy
2706          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2707          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2708          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2709          */
2710 #include "builtin-policy.h"
2711         u8 i;
2712         const int idx = tomoyo_read_lock();
2713         for (i = 0; i < 5; i++) {
2714                 struct tomoyo_io_buffer head = { };
2715                 char *start = "";
2716                 switch (i) {
2717                 case 0:
2718                         start = tomoyo_builtin_profile;
2719                         head.type = TOMOYO_PROFILE;
2720                         head.write = tomoyo_write_profile;
2721                         break;
2722                 case 1:
2723                         start = tomoyo_builtin_exception_policy;
2724                         head.type = TOMOYO_EXCEPTIONPOLICY;
2725                         head.write = tomoyo_write_exception;
2726                         break;
2727                 case 2:
2728                         start = tomoyo_builtin_domain_policy;
2729                         head.type = TOMOYO_DOMAINPOLICY;
2730                         head.write = tomoyo_write_domain;
2731                         break;
2732                 case 3:
2733                         start = tomoyo_builtin_manager;
2734                         head.type = TOMOYO_MANAGER;
2735                         head.write = tomoyo_write_manager;
2736                         break;
2737                 case 4:
2738                         start = tomoyo_builtin_stat;
2739                         head.type = TOMOYO_STAT;
2740                         head.write = tomoyo_write_stat;
2741                         break;
2742                 }
2743                 while (1) {
2744                         char *end = strchr(start, '\n');
2745                         if (!end)
2746                                 break;
2747                         *end = '\0';
2748                         tomoyo_normalize_line(start);
2749                         head.write_buf = start;
2750                         tomoyo_parse_policy(&head, start);
2751                         start = end + 1;
2752                 }
2753         }
2754         tomoyo_read_unlock(idx);
2755 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2756         tomoyo_check_profile();
2757 #endif
2758 }