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TOMOYO Linux Cross Reference
Linux/security/tomoyo/common.c

Version: ~ [ linux-5.1-rc1 ] ~ [ linux-5.0.3 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.30 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.107 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.164 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.176 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.136 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * security/tomoyo/common.c
  4  *
  5  * Copyright (C) 2005-2011  NTT DATA CORPORATION
  6  */
  7 
  8 #include <linux/uaccess.h>
  9 #include <linux/slab.h>
 10 #include <linux/security.h>
 11 #include "common.h"
 12 
 13 /* String table for operation mode. */
 14 const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE] = {
 15         [TOMOYO_CONFIG_DISABLED]   = "disabled",
 16         [TOMOYO_CONFIG_LEARNING]   = "learning",
 17         [TOMOYO_CONFIG_PERMISSIVE] = "permissive",
 18         [TOMOYO_CONFIG_ENFORCING]  = "enforcing"
 19 };
 20 
 21 /* String table for /sys/kernel/security/tomoyo/profile */
 22 const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
 23                                        + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
 24         /* CONFIG::file group */
 25         [TOMOYO_MAC_FILE_EXECUTE]    = "execute",
 26         [TOMOYO_MAC_FILE_OPEN]       = "open",
 27         [TOMOYO_MAC_FILE_CREATE]     = "create",
 28         [TOMOYO_MAC_FILE_UNLINK]     = "unlink",
 29         [TOMOYO_MAC_FILE_GETATTR]    = "getattr",
 30         [TOMOYO_MAC_FILE_MKDIR]      = "mkdir",
 31         [TOMOYO_MAC_FILE_RMDIR]      = "rmdir",
 32         [TOMOYO_MAC_FILE_MKFIFO]     = "mkfifo",
 33         [TOMOYO_MAC_FILE_MKSOCK]     = "mksock",
 34         [TOMOYO_MAC_FILE_TRUNCATE]   = "truncate",
 35         [TOMOYO_MAC_FILE_SYMLINK]    = "symlink",
 36         [TOMOYO_MAC_FILE_MKBLOCK]    = "mkblock",
 37         [TOMOYO_MAC_FILE_MKCHAR]     = "mkchar",
 38         [TOMOYO_MAC_FILE_LINK]       = "link",
 39         [TOMOYO_MAC_FILE_RENAME]     = "rename",
 40         [TOMOYO_MAC_FILE_CHMOD]      = "chmod",
 41         [TOMOYO_MAC_FILE_CHOWN]      = "chown",
 42         [TOMOYO_MAC_FILE_CHGRP]      = "chgrp",
 43         [TOMOYO_MAC_FILE_IOCTL]      = "ioctl",
 44         [TOMOYO_MAC_FILE_CHROOT]     = "chroot",
 45         [TOMOYO_MAC_FILE_MOUNT]      = "mount",
 46         [TOMOYO_MAC_FILE_UMOUNT]     = "unmount",
 47         [TOMOYO_MAC_FILE_PIVOT_ROOT] = "pivot_root",
 48         /* CONFIG::network group */
 49         [TOMOYO_MAC_NETWORK_INET_STREAM_BIND]       = "inet_stream_bind",
 50         [TOMOYO_MAC_NETWORK_INET_STREAM_LISTEN]     = "inet_stream_listen",
 51         [TOMOYO_MAC_NETWORK_INET_STREAM_CONNECT]    = "inet_stream_connect",
 52         [TOMOYO_MAC_NETWORK_INET_DGRAM_BIND]        = "inet_dgram_bind",
 53         [TOMOYO_MAC_NETWORK_INET_DGRAM_SEND]        = "inet_dgram_send",
 54         [TOMOYO_MAC_NETWORK_INET_RAW_BIND]          = "inet_raw_bind",
 55         [TOMOYO_MAC_NETWORK_INET_RAW_SEND]          = "inet_raw_send",
 56         [TOMOYO_MAC_NETWORK_UNIX_STREAM_BIND]       = "unix_stream_bind",
 57         [TOMOYO_MAC_NETWORK_UNIX_STREAM_LISTEN]     = "unix_stream_listen",
 58         [TOMOYO_MAC_NETWORK_UNIX_STREAM_CONNECT]    = "unix_stream_connect",
 59         [TOMOYO_MAC_NETWORK_UNIX_DGRAM_BIND]        = "unix_dgram_bind",
 60         [TOMOYO_MAC_NETWORK_UNIX_DGRAM_SEND]        = "unix_dgram_send",
 61         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_BIND]    = "unix_seqpacket_bind",
 62         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_LISTEN]  = "unix_seqpacket_listen",
 63         [TOMOYO_MAC_NETWORK_UNIX_SEQPACKET_CONNECT] = "unix_seqpacket_connect",
 64         /* CONFIG::misc group */
 65         [TOMOYO_MAC_ENVIRON] = "env",
 66         /* CONFIG group */
 67         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
 68         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_NETWORK] = "network",
 69         [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_MISC] = "misc",
 70 };
 71 
 72 /* String table for conditions. */
 73 const char * const tomoyo_condition_keyword[TOMOYO_MAX_CONDITION_KEYWORD] = {
 74         [TOMOYO_TASK_UID]             = "task.uid",
 75         [TOMOYO_TASK_EUID]            = "task.euid",
 76         [TOMOYO_TASK_SUID]            = "task.suid",
 77         [TOMOYO_TASK_FSUID]           = "task.fsuid",
 78         [TOMOYO_TASK_GID]             = "task.gid",
 79         [TOMOYO_TASK_EGID]            = "task.egid",
 80         [TOMOYO_TASK_SGID]            = "task.sgid",
 81         [TOMOYO_TASK_FSGID]           = "task.fsgid",
 82         [TOMOYO_TASK_PID]             = "task.pid",
 83         [TOMOYO_TASK_PPID]            = "task.ppid",
 84         [TOMOYO_EXEC_ARGC]            = "exec.argc",
 85         [TOMOYO_EXEC_ENVC]            = "exec.envc",
 86         [TOMOYO_TYPE_IS_SOCKET]       = "socket",
 87         [TOMOYO_TYPE_IS_SYMLINK]      = "symlink",
 88         [TOMOYO_TYPE_IS_FILE]         = "file",
 89         [TOMOYO_TYPE_IS_BLOCK_DEV]    = "block",
 90         [TOMOYO_TYPE_IS_DIRECTORY]    = "directory",
 91         [TOMOYO_TYPE_IS_CHAR_DEV]     = "char",
 92         [TOMOYO_TYPE_IS_FIFO]         = "fifo",
 93         [TOMOYO_MODE_SETUID]          = "setuid",
 94         [TOMOYO_MODE_SETGID]          = "setgid",
 95         [TOMOYO_MODE_STICKY]          = "sticky",
 96         [TOMOYO_MODE_OWNER_READ]      = "owner_read",
 97         [TOMOYO_MODE_OWNER_WRITE]     = "owner_write",
 98         [TOMOYO_MODE_OWNER_EXECUTE]   = "owner_execute",
 99         [TOMOYO_MODE_GROUP_READ]      = "group_read",
100         [TOMOYO_MODE_GROUP_WRITE]     = "group_write",
101         [TOMOYO_MODE_GROUP_EXECUTE]   = "group_execute",
102         [TOMOYO_MODE_OTHERS_READ]     = "others_read",
103         [TOMOYO_MODE_OTHERS_WRITE]    = "others_write",
104         [TOMOYO_MODE_OTHERS_EXECUTE]  = "others_execute",
105         [TOMOYO_EXEC_REALPATH]        = "exec.realpath",
106         [TOMOYO_SYMLINK_TARGET]       = "symlink.target",
107         [TOMOYO_PATH1_UID]            = "path1.uid",
108         [TOMOYO_PATH1_GID]            = "path1.gid",
109         [TOMOYO_PATH1_INO]            = "path1.ino",
110         [TOMOYO_PATH1_MAJOR]          = "path1.major",
111         [TOMOYO_PATH1_MINOR]          = "path1.minor",
112         [TOMOYO_PATH1_PERM]           = "path1.perm",
113         [TOMOYO_PATH1_TYPE]           = "path1.type",
114         [TOMOYO_PATH1_DEV_MAJOR]      = "path1.dev_major",
115         [TOMOYO_PATH1_DEV_MINOR]      = "path1.dev_minor",
116         [TOMOYO_PATH2_UID]            = "path2.uid",
117         [TOMOYO_PATH2_GID]            = "path2.gid",
118         [TOMOYO_PATH2_INO]            = "path2.ino",
119         [TOMOYO_PATH2_MAJOR]          = "path2.major",
120         [TOMOYO_PATH2_MINOR]          = "path2.minor",
121         [TOMOYO_PATH2_PERM]           = "path2.perm",
122         [TOMOYO_PATH2_TYPE]           = "path2.type",
123         [TOMOYO_PATH2_DEV_MAJOR]      = "path2.dev_major",
124         [TOMOYO_PATH2_DEV_MINOR]      = "path2.dev_minor",
125         [TOMOYO_PATH1_PARENT_UID]     = "path1.parent.uid",
126         [TOMOYO_PATH1_PARENT_GID]     = "path1.parent.gid",
127         [TOMOYO_PATH1_PARENT_INO]     = "path1.parent.ino",
128         [TOMOYO_PATH1_PARENT_PERM]    = "path1.parent.perm",
129         [TOMOYO_PATH2_PARENT_UID]     = "path2.parent.uid",
130         [TOMOYO_PATH2_PARENT_GID]     = "path2.parent.gid",
131         [TOMOYO_PATH2_PARENT_INO]     = "path2.parent.ino",
132         [TOMOYO_PATH2_PARENT_PERM]    = "path2.parent.perm",
133 };
134 
135 /* String table for PREFERENCE keyword. */
136 static const char * const tomoyo_pref_keywords[TOMOYO_MAX_PREF] = {
137         [TOMOYO_PREF_MAX_AUDIT_LOG]      = "max_audit_log",
138         [TOMOYO_PREF_MAX_LEARNING_ENTRY] = "max_learning_entry",
139 };
140 
141 /* String table for path operation. */
142 const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
143         [TOMOYO_TYPE_EXECUTE]    = "execute",
144         [TOMOYO_TYPE_READ]       = "read",
145         [TOMOYO_TYPE_WRITE]      = "write",
146         [TOMOYO_TYPE_APPEND]     = "append",
147         [TOMOYO_TYPE_UNLINK]     = "unlink",
148         [TOMOYO_TYPE_GETATTR]    = "getattr",
149         [TOMOYO_TYPE_RMDIR]      = "rmdir",
150         [TOMOYO_TYPE_TRUNCATE]   = "truncate",
151         [TOMOYO_TYPE_SYMLINK]    = "symlink",
152         [TOMOYO_TYPE_CHROOT]     = "chroot",
153         [TOMOYO_TYPE_UMOUNT]     = "unmount",
154 };
155 
156 /* String table for socket's operation. */
157 const char * const tomoyo_socket_keyword[TOMOYO_MAX_NETWORK_OPERATION] = {
158         [TOMOYO_NETWORK_BIND]    = "bind",
159         [TOMOYO_NETWORK_LISTEN]  = "listen",
160         [TOMOYO_NETWORK_CONNECT] = "connect",
161         [TOMOYO_NETWORK_SEND]    = "send",
162 };
163 
164 /* String table for categories. */
165 static const char * const tomoyo_category_keywords
166 [TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
167         [TOMOYO_MAC_CATEGORY_FILE]    = "file",
168         [TOMOYO_MAC_CATEGORY_NETWORK] = "network",
169         [TOMOYO_MAC_CATEGORY_MISC]    = "misc",
170 };
171 
172 /* Permit policy management by non-root user? */
173 static bool tomoyo_manage_by_non_root;
174 
175 /* Utility functions. */
176 
177 /**
178  * tomoyo_yesno - Return "yes" or "no".
179  *
180  * @value: Bool value.
181  */
182 const char *tomoyo_yesno(const unsigned int value)
183 {
184         return value ? "yes" : "no";
185 }
186 
187 /**
188  * tomoyo_addprintf - strncat()-like-snprintf().
189  *
190  * @buffer: Buffer to write to. Must be '\0'-terminated.
191  * @len:    Size of @buffer.
192  * @fmt:    The printf()'s format string, followed by parameters.
193  *
194  * Returns nothing.
195  */
196 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
197 {
198         va_list args;
199         const int pos = strlen(buffer);
200 
201         va_start(args, fmt);
202         vsnprintf(buffer + pos, len - pos - 1, fmt, args);
203         va_end(args);
204 }
205 
206 /**
207  * tomoyo_flush - Flush queued string to userspace's buffer.
208  *
209  * @head:   Pointer to "struct tomoyo_io_buffer".
210  *
211  * Returns true if all data was flushed, false otherwise.
212  */
213 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
214 {
215         while (head->r.w_pos) {
216                 const char *w = head->r.w[0];
217                 size_t len = strlen(w);
218 
219                 if (len) {
220                         if (len > head->read_user_buf_avail)
221                                 len = head->read_user_buf_avail;
222                         if (!len)
223                                 return false;
224                         if (copy_to_user(head->read_user_buf, w, len))
225                                 return false;
226                         head->read_user_buf_avail -= len;
227                         head->read_user_buf += len;
228                         w += len;
229                 }
230                 head->r.w[0] = w;
231                 if (*w)
232                         return false;
233                 /* Add '\0' for audit logs and query. */
234                 if (head->poll) {
235                         if (!head->read_user_buf_avail ||
236                             copy_to_user(head->read_user_buf, "", 1))
237                                 return false;
238                         head->read_user_buf_avail--;
239                         head->read_user_buf++;
240                 }
241                 head->r.w_pos--;
242                 for (len = 0; len < head->r.w_pos; len++)
243                         head->r.w[len] = head->r.w[len + 1];
244         }
245         head->r.avail = 0;
246         return true;
247 }
248 
249 /**
250  * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
251  *
252  * @head:   Pointer to "struct tomoyo_io_buffer".
253  * @string: String to print.
254  *
255  * Note that @string has to be kept valid until @head is kfree()d.
256  * This means that char[] allocated on stack memory cannot be passed to
257  * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
258  */
259 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
260 {
261         if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
262                 head->r.w[head->r.w_pos++] = string;
263                 tomoyo_flush(head);
264         } else
265                 WARN_ON(1);
266 }
267 
268 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
269                              ...) __printf(2, 3);
270 
271 /**
272  * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
273  *
274  * @head: Pointer to "struct tomoyo_io_buffer".
275  * @fmt:  The printf()'s format string, followed by parameters.
276  */
277 static void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt,
278                              ...)
279 {
280         va_list args;
281         size_t len;
282         size_t pos = head->r.avail;
283         int size = head->readbuf_size - pos;
284 
285         if (size <= 0)
286                 return;
287         va_start(args, fmt);
288         len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
289         va_end(args);
290         if (pos + len >= head->readbuf_size) {
291                 WARN_ON(1);
292                 return;
293         }
294         head->r.avail += len;
295         tomoyo_set_string(head, head->read_buf + pos);
296 }
297 
298 /**
299  * tomoyo_set_space - Put a space to "struct tomoyo_io_buffer" structure.
300  *
301  * @head: Pointer to "struct tomoyo_io_buffer".
302  *
303  * Returns nothing.
304  */
305 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
306 {
307         tomoyo_set_string(head, " ");
308 }
309 
310 /**
311  * tomoyo_set_lf - Put a line feed to "struct tomoyo_io_buffer" structure.
312  *
313  * @head: Pointer to "struct tomoyo_io_buffer".
314  *
315  * Returns nothing.
316  */
317 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
318 {
319         tomoyo_set_string(head, "\n");
320         return !head->r.w_pos;
321 }
322 
323 /**
324  * tomoyo_set_slash - Put a shash to "struct tomoyo_io_buffer" structure.
325  *
326  * @head: Pointer to "struct tomoyo_io_buffer".
327  *
328  * Returns nothing.
329  */
330 static void tomoyo_set_slash(struct tomoyo_io_buffer *head)
331 {
332         tomoyo_set_string(head, "/");
333 }
334 
335 /* List of namespaces. */
336 LIST_HEAD(tomoyo_namespace_list);
337 /* True if namespace other than tomoyo_kernel_namespace is defined. */
338 static bool tomoyo_namespace_enabled;
339 
340 /**
341  * tomoyo_init_policy_namespace - Initialize namespace.
342  *
343  * @ns: Pointer to "struct tomoyo_policy_namespace".
344  *
345  * Returns nothing.
346  */
347 void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns)
348 {
349         unsigned int idx;
350 
351         for (idx = 0; idx < TOMOYO_MAX_ACL_GROUPS; idx++)
352                 INIT_LIST_HEAD(&ns->acl_group[idx]);
353         for (idx = 0; idx < TOMOYO_MAX_GROUP; idx++)
354                 INIT_LIST_HEAD(&ns->group_list[idx]);
355         for (idx = 0; idx < TOMOYO_MAX_POLICY; idx++)
356                 INIT_LIST_HEAD(&ns->policy_list[idx]);
357         ns->profile_version = 20150505;
358         tomoyo_namespace_enabled = !list_empty(&tomoyo_namespace_list);
359         list_add_tail_rcu(&ns->namespace_list, &tomoyo_namespace_list);
360 }
361 
362 /**
363  * tomoyo_print_namespace - Print namespace header.
364  *
365  * @head: Pointer to "struct tomoyo_io_buffer".
366  *
367  * Returns nothing.
368  */
369 static void tomoyo_print_namespace(struct tomoyo_io_buffer *head)
370 {
371         if (!tomoyo_namespace_enabled)
372                 return;
373         tomoyo_set_string(head,
374                           container_of(head->r.ns,
375                                        struct tomoyo_policy_namespace,
376                                        namespace_list)->name);
377         tomoyo_set_space(head);
378 }
379 
380 /**
381  * tomoyo_print_name_union - Print a tomoyo_name_union.
382  *
383  * @head: Pointer to "struct tomoyo_io_buffer".
384  * @ptr:  Pointer to "struct tomoyo_name_union".
385  */
386 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
387                                     const struct tomoyo_name_union *ptr)
388 {
389         tomoyo_set_space(head);
390         if (ptr->group) {
391                 tomoyo_set_string(head, "@");
392                 tomoyo_set_string(head, ptr->group->group_name->name);
393         } else {
394                 tomoyo_set_string(head, ptr->filename->name);
395         }
396 }
397 
398 /**
399  * tomoyo_print_name_union_quoted - Print a tomoyo_name_union with a quote.
400  *
401  * @head: Pointer to "struct tomoyo_io_buffer".
402  * @ptr:  Pointer to "struct tomoyo_name_union".
403  *
404  * Returns nothing.
405  */
406 static void tomoyo_print_name_union_quoted(struct tomoyo_io_buffer *head,
407                                            const struct tomoyo_name_union *ptr)
408 {
409         if (ptr->group) {
410                 tomoyo_set_string(head, "@");
411                 tomoyo_set_string(head, ptr->group->group_name->name);
412         } else {
413                 tomoyo_set_string(head, "\"");
414                 tomoyo_set_string(head, ptr->filename->name);
415                 tomoyo_set_string(head, "\"");
416         }
417 }
418 
419 /**
420  * tomoyo_print_number_union_nospace - Print a tomoyo_number_union without a space.
421  *
422  * @head: Pointer to "struct tomoyo_io_buffer".
423  * @ptr:  Pointer to "struct tomoyo_number_union".
424  *
425  * Returns nothing.
426  */
427 static void tomoyo_print_number_union_nospace
428 (struct tomoyo_io_buffer *head, const struct tomoyo_number_union *ptr)
429 {
430         if (ptr->group) {
431                 tomoyo_set_string(head, "@");
432                 tomoyo_set_string(head, ptr->group->group_name->name);
433         } else {
434                 int i;
435                 unsigned long min = ptr->values[0];
436                 const unsigned long max = ptr->values[1];
437                 u8 min_type = ptr->value_type[0];
438                 const u8 max_type = ptr->value_type[1];
439                 char buffer[128];
440 
441                 buffer[0] = '\0';
442                 for (i = 0; i < 2; i++) {
443                         switch (min_type) {
444                         case TOMOYO_VALUE_TYPE_HEXADECIMAL:
445                                 tomoyo_addprintf(buffer, sizeof(buffer),
446                                                  "0x%lX", min);
447                                 break;
448                         case TOMOYO_VALUE_TYPE_OCTAL:
449                                 tomoyo_addprintf(buffer, sizeof(buffer),
450                                                  "0%lo", min);
451                                 break;
452                         default:
453                                 tomoyo_addprintf(buffer, sizeof(buffer), "%lu",
454                                                  min);
455                                 break;
456                         }
457                         if (min == max && min_type == max_type)
458                                 break;
459                         tomoyo_addprintf(buffer, sizeof(buffer), "-");
460                         min_type = max_type;
461                         min = max;
462                 }
463                 tomoyo_io_printf(head, "%s", buffer);
464         }
465 }
466 
467 /**
468  * tomoyo_print_number_union - Print a tomoyo_number_union.
469  *
470  * @head: Pointer to "struct tomoyo_io_buffer".
471  * @ptr:  Pointer to "struct tomoyo_number_union".
472  *
473  * Returns nothing.
474  */
475 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
476                                       const struct tomoyo_number_union *ptr)
477 {
478         tomoyo_set_space(head);
479         tomoyo_print_number_union_nospace(head, ptr);
480 }
481 
482 /**
483  * tomoyo_assign_profile - Create a new profile.
484  *
485  * @ns:      Pointer to "struct tomoyo_policy_namespace".
486  * @profile: Profile number to create.
487  *
488  * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
489  */
490 static struct tomoyo_profile *tomoyo_assign_profile
491 (struct tomoyo_policy_namespace *ns, const unsigned int profile)
492 {
493         struct tomoyo_profile *ptr;
494         struct tomoyo_profile *entry;
495 
496         if (profile >= TOMOYO_MAX_PROFILES)
497                 return NULL;
498         ptr = ns->profile_ptr[profile];
499         if (ptr)
500                 return ptr;
501         entry = kzalloc(sizeof(*entry), GFP_NOFS);
502         if (mutex_lock_interruptible(&tomoyo_policy_lock))
503                 goto out;
504         ptr = ns->profile_ptr[profile];
505         if (!ptr && tomoyo_memory_ok(entry)) {
506                 ptr = entry;
507                 ptr->default_config = TOMOYO_CONFIG_DISABLED |
508                         TOMOYO_CONFIG_WANT_GRANT_LOG |
509                         TOMOYO_CONFIG_WANT_REJECT_LOG;
510                 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
511                        sizeof(ptr->config));
512                 ptr->pref[TOMOYO_PREF_MAX_AUDIT_LOG] =
513                         CONFIG_SECURITY_TOMOYO_MAX_AUDIT_LOG;
514                 ptr->pref[TOMOYO_PREF_MAX_LEARNING_ENTRY] =
515                         CONFIG_SECURITY_TOMOYO_MAX_ACCEPT_ENTRY;
516                 mb(); /* Avoid out-of-order execution. */
517                 ns->profile_ptr[profile] = ptr;
518                 entry = NULL;
519         }
520         mutex_unlock(&tomoyo_policy_lock);
521  out:
522         kfree(entry);
523         return ptr;
524 }
525 
526 /**
527  * tomoyo_profile - Find a profile.
528  *
529  * @ns:      Pointer to "struct tomoyo_policy_namespace".
530  * @profile: Profile number to find.
531  *
532  * Returns pointer to "struct tomoyo_profile".
533  */
534 struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
535                                       const u8 profile)
536 {
537         static struct tomoyo_profile tomoyo_null_profile;
538         struct tomoyo_profile *ptr = ns->profile_ptr[profile];
539 
540         if (!ptr)
541                 ptr = &tomoyo_null_profile;
542         return ptr;
543 }
544 
545 /**
546  * tomoyo_find_yesno - Find values for specified keyword.
547  *
548  * @string: String to check.
549  * @find:   Name of keyword.
550  *
551  * Returns 1 if "@find=yes" was found, 0 if "@find=no" was found, -1 otherwise.
552  */
553 static s8 tomoyo_find_yesno(const char *string, const char *find)
554 {
555         const char *cp = strstr(string, find);
556 
557         if (cp) {
558                 cp += strlen(find);
559                 if (!strncmp(cp, "=yes", 4))
560                         return 1;
561                 else if (!strncmp(cp, "=no", 3))
562                         return 0;
563         }
564         return -1;
565 }
566 
567 /**
568  * tomoyo_set_uint - Set value for specified preference.
569  *
570  * @i:      Pointer to "unsigned int".
571  * @string: String to check.
572  * @find:   Name of keyword.
573  *
574  * Returns nothing.
575  */
576 static void tomoyo_set_uint(unsigned int *i, const char *string,
577                             const char *find)
578 {
579         const char *cp = strstr(string, find);
580 
581         if (cp)
582                 sscanf(cp + strlen(find), "=%u", i);
583 }
584 
585 /**
586  * tomoyo_set_mode - Set mode for specified profile.
587  *
588  * @name:    Name of functionality.
589  * @value:   Mode for @name.
590  * @profile: Pointer to "struct tomoyo_profile".
591  *
592  * Returns 0 on success, negative value otherwise.
593  */
594 static int tomoyo_set_mode(char *name, const char *value,
595                            struct tomoyo_profile *profile)
596 {
597         u8 i;
598         u8 config;
599 
600         if (!strcmp(name, "CONFIG")) {
601                 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
602                 config = profile->default_config;
603         } else if (tomoyo_str_starts(&name, "CONFIG::")) {
604                 config = 0;
605                 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
606                              + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
607                         int len = 0;
608 
609                         if (i < TOMOYO_MAX_MAC_INDEX) {
610                                 const u8 c = tomoyo_index2category[i];
611                                 const char *category =
612                                         tomoyo_category_keywords[c];
613 
614                                 len = strlen(category);
615                                 if (strncmp(name, category, len) ||
616                                     name[len++] != ':' || name[len++] != ':')
617                                         continue;
618                         }
619                         if (strcmp(name + len, tomoyo_mac_keywords[i]))
620                                 continue;
621                         config = profile->config[i];
622                         break;
623                 }
624                 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
625                         return -EINVAL;
626         } else {
627                 return -EINVAL;
628         }
629         if (strstr(value, "use_default")) {
630                 config = TOMOYO_CONFIG_USE_DEFAULT;
631         } else {
632                 u8 mode;
633 
634                 for (mode = 0; mode < 4; mode++)
635                         if (strstr(value, tomoyo_mode[mode]))
636                                 /*
637                                  * Update lower 3 bits in order to distinguish
638                                  * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
639                                  */
640                                 config = (config & ~7) | mode;
641                 if (config != TOMOYO_CONFIG_USE_DEFAULT) {
642                         switch (tomoyo_find_yesno(value, "grant_log")) {
643                         case 1:
644                                 config |= TOMOYO_CONFIG_WANT_GRANT_LOG;
645                                 break;
646                         case 0:
647                                 config &= ~TOMOYO_CONFIG_WANT_GRANT_LOG;
648                                 break;
649                         }
650                         switch (tomoyo_find_yesno(value, "reject_log")) {
651                         case 1:
652                                 config |= TOMOYO_CONFIG_WANT_REJECT_LOG;
653                                 break;
654                         case 0:
655                                 config &= ~TOMOYO_CONFIG_WANT_REJECT_LOG;
656                                 break;
657                         }
658                 }
659         }
660         if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
661                 profile->config[i] = config;
662         else if (config != TOMOYO_CONFIG_USE_DEFAULT)
663                 profile->default_config = config;
664         return 0;
665 }
666 
667 /**
668  * tomoyo_write_profile - Write profile table.
669  *
670  * @head: Pointer to "struct tomoyo_io_buffer".
671  *
672  * Returns 0 on success, negative value otherwise.
673  */
674 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
675 {
676         char *data = head->write_buf;
677         unsigned int i;
678         char *cp;
679         struct tomoyo_profile *profile;
680 
681         if (sscanf(data, "PROFILE_VERSION=%u", &head->w.ns->profile_version)
682             == 1)
683                 return 0;
684         i = simple_strtoul(data, &cp, 10);
685         if (*cp != '-')
686                 return -EINVAL;
687         data = cp + 1;
688         profile = tomoyo_assign_profile(head->w.ns, i);
689         if (!profile)
690                 return -EINVAL;
691         cp = strchr(data, '=');
692         if (!cp)
693                 return -EINVAL;
694         *cp++ = '\0';
695         if (!strcmp(data, "COMMENT")) {
696                 static DEFINE_SPINLOCK(lock);
697                 const struct tomoyo_path_info *new_comment
698                         = tomoyo_get_name(cp);
699                 const struct tomoyo_path_info *old_comment;
700 
701                 if (!new_comment)
702                         return -ENOMEM;
703                 spin_lock(&lock);
704                 old_comment = profile->comment;
705                 profile->comment = new_comment;
706                 spin_unlock(&lock);
707                 tomoyo_put_name(old_comment);
708                 return 0;
709         }
710         if (!strcmp(data, "PREFERENCE")) {
711                 for (i = 0; i < TOMOYO_MAX_PREF; i++)
712                         tomoyo_set_uint(&profile->pref[i], cp,
713                                         tomoyo_pref_keywords[i]);
714                 return 0;
715         }
716         return tomoyo_set_mode(data, cp, profile);
717 }
718 
719 /**
720  * tomoyo_print_config - Print mode for specified functionality.
721  *
722  * @head:   Pointer to "struct tomoyo_io_buffer".
723  * @config: Mode for that functionality.
724  *
725  * Returns nothing.
726  *
727  * Caller prints functionality's name.
728  */
729 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
730 {
731         tomoyo_io_printf(head, "={ mode=%s grant_log=%s reject_log=%s }\n",
732                          tomoyo_mode[config & 3],
733                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_GRANT_LOG),
734                          tomoyo_yesno(config & TOMOYO_CONFIG_WANT_REJECT_LOG));
735 }
736 
737 /**
738  * tomoyo_read_profile - Read profile table.
739  *
740  * @head: Pointer to "struct tomoyo_io_buffer".
741  *
742  * Returns nothing.
743  */
744 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
745 {
746         u8 index;
747         struct tomoyo_policy_namespace *ns =
748                 container_of(head->r.ns, typeof(*ns), namespace_list);
749         const struct tomoyo_profile *profile;
750 
751         if (head->r.eof)
752                 return;
753  next:
754         index = head->r.index;
755         profile = ns->profile_ptr[index];
756         switch (head->r.step) {
757         case 0:
758                 tomoyo_print_namespace(head);
759                 tomoyo_io_printf(head, "PROFILE_VERSION=%u\n",
760                                  ns->profile_version);
761                 head->r.step++;
762                 break;
763         case 1:
764                 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
765                       head->r.index++)
766                         if (ns->profile_ptr[head->r.index])
767                                 break;
768                 if (head->r.index == TOMOYO_MAX_PROFILES) {
769                         head->r.eof = true;
770                         return;
771                 }
772                 head->r.step++;
773                 break;
774         case 2:
775                 {
776                         u8 i;
777                         const struct tomoyo_path_info *comment =
778                                 profile->comment;
779 
780                         tomoyo_print_namespace(head);
781                         tomoyo_io_printf(head, "%u-COMMENT=", index);
782                         tomoyo_set_string(head, comment ? comment->name : "");
783                         tomoyo_set_lf(head);
784                         tomoyo_print_namespace(head);
785                         tomoyo_io_printf(head, "%u-PREFERENCE={ ", index);
786                         for (i = 0; i < TOMOYO_MAX_PREF; i++)
787                                 tomoyo_io_printf(head, "%s=%u ",
788                                                  tomoyo_pref_keywords[i],
789                                                  profile->pref[i]);
790                         tomoyo_set_string(head, "}\n");
791                         head->r.step++;
792                 }
793                 break;
794         case 3:
795                 {
796                         tomoyo_print_namespace(head);
797                         tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
798                         tomoyo_print_config(head, profile->default_config);
799                         head->r.bit = 0;
800                         head->r.step++;
801                 }
802                 break;
803         case 4:
804                 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
805                               + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
806                         const u8 i = head->r.bit;
807                         const u8 config = profile->config[i];
808 
809                         if (config == TOMOYO_CONFIG_USE_DEFAULT)
810                                 continue;
811                         tomoyo_print_namespace(head);
812                         if (i < TOMOYO_MAX_MAC_INDEX)
813                                 tomoyo_io_printf(head, "%u-CONFIG::%s::%s",
814                                                  index,
815                                                  tomoyo_category_keywords
816                                                  [tomoyo_index2category[i]],
817                                                  tomoyo_mac_keywords[i]);
818                         else
819                                 tomoyo_io_printf(head, "%u-CONFIG::%s", index,
820                                                  tomoyo_mac_keywords[i]);
821                         tomoyo_print_config(head, config);
822                         head->r.bit++;
823                         break;
824                 }
825                 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
826                     + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
827                         head->r.index++;
828                         head->r.step = 1;
829                 }
830                 break;
831         }
832         if (tomoyo_flush(head))
833                 goto next;
834 }
835 
836 /**
837  * tomoyo_same_manager - Check for duplicated "struct tomoyo_manager" entry.
838  *
839  * @a: Pointer to "struct tomoyo_acl_head".
840  * @b: Pointer to "struct tomoyo_acl_head".
841  *
842  * Returns true if @a == @b, false otherwise.
843  */
844 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
845                                 const struct tomoyo_acl_head *b)
846 {
847         return container_of(a, struct tomoyo_manager, head)->manager ==
848                 container_of(b, struct tomoyo_manager, head)->manager;
849 }
850 
851 /**
852  * tomoyo_update_manager_entry - Add a manager entry.
853  *
854  * @manager:   The path to manager or the domainnamme.
855  * @is_delete: True if it is a delete request.
856  *
857  * Returns 0 on success, negative value otherwise.
858  *
859  * Caller holds tomoyo_read_lock().
860  */
861 static int tomoyo_update_manager_entry(const char *manager,
862                                        const bool is_delete)
863 {
864         struct tomoyo_manager e = { };
865         struct tomoyo_acl_param param = {
866                 /* .ns = &tomoyo_kernel_namespace, */
867                 .is_delete = is_delete,
868                 .list = &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER],
869         };
870         int error = is_delete ? -ENOENT : -ENOMEM;
871 
872         if (!tomoyo_correct_domain(manager) &&
873             !tomoyo_correct_word(manager))
874                 return -EINVAL;
875         e.manager = tomoyo_get_name(manager);
876         if (e.manager) {
877                 error = tomoyo_update_policy(&e.head, sizeof(e), &param,
878                                              tomoyo_same_manager);
879                 tomoyo_put_name(e.manager);
880         }
881         return error;
882 }
883 
884 /**
885  * tomoyo_write_manager - Write manager policy.
886  *
887  * @head: Pointer to "struct tomoyo_io_buffer".
888  *
889  * Returns 0 on success, negative value otherwise.
890  *
891  * Caller holds tomoyo_read_lock().
892  */
893 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
894 {
895         char *data = head->write_buf;
896 
897         if (!strcmp(data, "manage_by_non_root")) {
898                 tomoyo_manage_by_non_root = !head->w.is_delete;
899                 return 0;
900         }
901         return tomoyo_update_manager_entry(data, head->w.is_delete);
902 }
903 
904 /**
905  * tomoyo_read_manager - Read manager policy.
906  *
907  * @head: Pointer to "struct tomoyo_io_buffer".
908  *
909  * Caller holds tomoyo_read_lock().
910  */
911 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
912 {
913         if (head->r.eof)
914                 return;
915         list_for_each_cookie(head->r.acl, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER]) {
916                 struct tomoyo_manager *ptr =
917                         list_entry(head->r.acl, typeof(*ptr), head.list);
918 
919                 if (ptr->head.is_deleted)
920                         continue;
921                 if (!tomoyo_flush(head))
922                         return;
923                 tomoyo_set_string(head, ptr->manager->name);
924                 tomoyo_set_lf(head);
925         }
926         head->r.eof = true;
927 }
928 
929 /**
930  * tomoyo_manager - Check whether the current process is a policy manager.
931  *
932  * Returns true if the current process is permitted to modify policy
933  * via /sys/kernel/security/tomoyo/ interface.
934  *
935  * Caller holds tomoyo_read_lock().
936  */
937 static bool tomoyo_manager(void)
938 {
939         struct tomoyo_manager *ptr;
940         const char *exe;
941         const struct task_struct *task = current;
942         const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
943         bool found = false;
944 
945         if (!tomoyo_policy_loaded)
946                 return true;
947         if (!tomoyo_manage_by_non_root &&
948             (!uid_eq(task->cred->uid,  GLOBAL_ROOT_UID) ||
949              !uid_eq(task->cred->euid, GLOBAL_ROOT_UID)))
950                 return false;
951         exe = tomoyo_get_exe();
952         if (!exe)
953                 return false;
954         list_for_each_entry_rcu(ptr, &tomoyo_kernel_namespace.policy_list[TOMOYO_ID_MANAGER], head.list) {
955                 if (!ptr->head.is_deleted &&
956                     (!tomoyo_pathcmp(domainname, ptr->manager) ||
957                      !strcmp(exe, ptr->manager->name))) {
958                         found = true;
959                         break;
960                 }
961         }
962         if (!found) { /* Reduce error messages. */
963                 static pid_t last_pid;
964                 const pid_t pid = current->pid;
965 
966                 if (last_pid != pid) {
967                         pr_warn("%s ( %s ) is not permitted to update policies.\n",
968                                 domainname->name, exe);
969                         last_pid = pid;
970                 }
971         }
972         kfree(exe);
973         return found;
974 }
975 
976 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
977 (unsigned int serial);
978 
979 /**
980  * tomoyo_select_domain - Parse select command.
981  *
982  * @head: Pointer to "struct tomoyo_io_buffer".
983  * @data: String to parse.
984  *
985  * Returns true on success, false otherwise.
986  *
987  * Caller holds tomoyo_read_lock().
988  */
989 static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
990                                  const char *data)
991 {
992         unsigned int pid;
993         struct tomoyo_domain_info *domain = NULL;
994         bool global_pid = false;
995 
996         if (strncmp(data, "select ", 7))
997                 return false;
998         data += 7;
999         if (sscanf(data, "pid=%u", &pid) == 1 ||
1000             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
1001                 struct task_struct *p;
1002 
1003                 rcu_read_lock();
1004                 if (global_pid)
1005                         p = find_task_by_pid_ns(pid, &init_pid_ns);
1006                 else
1007                         p = find_task_by_vpid(pid);
1008                 if (p)
1009                         domain = tomoyo_task(p)->domain_info;
1010                 rcu_read_unlock();
1011         } else if (!strncmp(data, "domain=", 7)) {
1012                 if (tomoyo_domain_def(data + 7))
1013                         domain = tomoyo_find_domain(data + 7);
1014         } else if (sscanf(data, "Q=%u", &pid) == 1) {
1015                 domain = tomoyo_find_domain_by_qid(pid);
1016         } else
1017                 return false;
1018         head->w.domain = domain;
1019         /* Accessing read_buf is safe because head->io_sem is held. */
1020         if (!head->read_buf)
1021                 return true; /* Do nothing if open(O_WRONLY). */
1022         memset(&head->r, 0, sizeof(head->r));
1023         head->r.print_this_domain_only = true;
1024         if (domain)
1025                 head->r.domain = &domain->list;
1026         else
1027                 head->r.eof = 1;
1028         tomoyo_io_printf(head, "# select %s\n", data);
1029         if (domain && domain->is_deleted)
1030                 tomoyo_io_printf(head, "# This is a deleted domain.\n");
1031         return true;
1032 }
1033 
1034 /**
1035  * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
1036  *
1037  * @a: Pointer to "struct tomoyo_acl_info".
1038  * @b: Pointer to "struct tomoyo_acl_info".
1039  *
1040  * Returns true if @a == @b, false otherwise.
1041  */
1042 static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
1043                                  const struct tomoyo_acl_info *b)
1044 {
1045         const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
1046         const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
1047 
1048         return p1->domainname == p2->domainname;
1049 }
1050 
1051 /**
1052  * tomoyo_write_task - Update task related list.
1053  *
1054  * @param: Pointer to "struct tomoyo_acl_param".
1055  *
1056  * Returns 0 on success, negative value otherwise.
1057  *
1058  * Caller holds tomoyo_read_lock().
1059  */
1060 static int tomoyo_write_task(struct tomoyo_acl_param *param)
1061 {
1062         int error = -EINVAL;
1063 
1064         if (tomoyo_str_starts(&param->data, "manual_domain_transition ")) {
1065                 struct tomoyo_task_acl e = {
1066                         .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
1067                         .domainname = tomoyo_get_domainname(param),
1068                 };
1069 
1070                 if (e.domainname)
1071                         error = tomoyo_update_domain(&e.head, sizeof(e), param,
1072                                                      tomoyo_same_task_acl,
1073                                                      NULL);
1074                 tomoyo_put_name(e.domainname);
1075         }
1076         return error;
1077 }
1078 
1079 /**
1080  * tomoyo_delete_domain - Delete a domain.
1081  *
1082  * @domainname: The name of domain.
1083  *
1084  * Returns 0 on success, negative value otherwise.
1085  *
1086  * Caller holds tomoyo_read_lock().
1087  */
1088 static int tomoyo_delete_domain(char *domainname)
1089 {
1090         struct tomoyo_domain_info *domain;
1091         struct tomoyo_path_info name;
1092 
1093         name.name = domainname;
1094         tomoyo_fill_path_info(&name);
1095         if (mutex_lock_interruptible(&tomoyo_policy_lock))
1096                 return -EINTR;
1097         /* Is there an active domain? */
1098         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1099                 /* Never delete tomoyo_kernel_domain */
1100                 if (domain == &tomoyo_kernel_domain)
1101                         continue;
1102                 if (domain->is_deleted ||
1103                     tomoyo_pathcmp(domain->domainname, &name))
1104                         continue;
1105                 domain->is_deleted = true;
1106                 break;
1107         }
1108         mutex_unlock(&tomoyo_policy_lock);
1109         return 0;
1110 }
1111 
1112 /**
1113  * tomoyo_write_domain2 - Write domain policy.
1114  *
1115  * @ns:        Pointer to "struct tomoyo_policy_namespace".
1116  * @list:      Pointer to "struct list_head".
1117  * @data:      Policy to be interpreted.
1118  * @is_delete: True if it is a delete request.
1119  *
1120  * Returns 0 on success, negative value otherwise.
1121  *
1122  * Caller holds tomoyo_read_lock().
1123  */
1124 static int tomoyo_write_domain2(struct tomoyo_policy_namespace *ns,
1125                                 struct list_head *list, char *data,
1126                                 const bool is_delete)
1127 {
1128         struct tomoyo_acl_param param = {
1129                 .ns = ns,
1130                 .list = list,
1131                 .data = data,
1132                 .is_delete = is_delete,
1133         };
1134         static const struct {
1135                 const char *keyword;
1136                 int (*write)(struct tomoyo_acl_param *param);
1137         } tomoyo_callback[5] = {
1138                 { "file ", tomoyo_write_file },
1139                 { "network inet ", tomoyo_write_inet_network },
1140                 { "network unix ", tomoyo_write_unix_network },
1141                 { "misc ", tomoyo_write_misc },
1142                 { "task ", tomoyo_write_task },
1143         };
1144         u8 i;
1145 
1146         for (i = 0; i < ARRAY_SIZE(tomoyo_callback); i++) {
1147                 if (!tomoyo_str_starts(&param.data,
1148                                        tomoyo_callback[i].keyword))
1149                         continue;
1150                 return tomoyo_callback[i].write(&param);
1151         }
1152         return -EINVAL;
1153 }
1154 
1155 /* String table for domain flags. */
1156 const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS] = {
1157         [TOMOYO_DIF_QUOTA_WARNED]      = "quota_exceeded\n",
1158         [TOMOYO_DIF_TRANSITION_FAILED] = "transition_failed\n",
1159 };
1160 
1161 /**
1162  * tomoyo_write_domain - Write domain policy.
1163  *
1164  * @head: Pointer to "struct tomoyo_io_buffer".
1165  *
1166  * Returns 0 on success, negative value otherwise.
1167  *
1168  * Caller holds tomoyo_read_lock().
1169  */
1170 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
1171 {
1172         char *data = head->write_buf;
1173         struct tomoyo_policy_namespace *ns;
1174         struct tomoyo_domain_info *domain = head->w.domain;
1175         const bool is_delete = head->w.is_delete;
1176         bool is_select = !is_delete && tomoyo_str_starts(&data, "select ");
1177         unsigned int idx;
1178 
1179         if (*data == '<') {
1180                 int ret = 0;
1181 
1182                 domain = NULL;
1183                 if (is_delete)
1184                         ret = tomoyo_delete_domain(data);
1185                 else if (is_select)
1186                         domain = tomoyo_find_domain(data);
1187                 else
1188                         domain = tomoyo_assign_domain(data, false);
1189                 head->w.domain = domain;
1190                 return ret;
1191         }
1192         if (!domain)
1193                 return -EINVAL;
1194         ns = domain->ns;
1195         if (sscanf(data, "use_profile %u", &idx) == 1
1196             && idx < TOMOYO_MAX_PROFILES) {
1197                 if (!tomoyo_policy_loaded || ns->profile_ptr[idx])
1198                         if (!is_delete)
1199                                 domain->profile = (u8) idx;
1200                 return 0;
1201         }
1202         if (sscanf(data, "use_group %u\n", &idx) == 1
1203             && idx < TOMOYO_MAX_ACL_GROUPS) {
1204                 if (!is_delete)
1205                         set_bit(idx, domain->group);
1206                 else
1207                         clear_bit(idx, domain->group);
1208                 return 0;
1209         }
1210         for (idx = 0; idx < TOMOYO_MAX_DOMAIN_INFO_FLAGS; idx++) {
1211                 const char *cp = tomoyo_dif[idx];
1212 
1213                 if (strncmp(data, cp, strlen(cp) - 1))
1214                         continue;
1215                 domain->flags[idx] = !is_delete;
1216                 return 0;
1217         }
1218         return tomoyo_write_domain2(ns, &domain->acl_info_list, data,
1219                                     is_delete);
1220 }
1221 
1222 /**
1223  * tomoyo_print_condition - Print condition part.
1224  *
1225  * @head: Pointer to "struct tomoyo_io_buffer".
1226  * @cond: Pointer to "struct tomoyo_condition".
1227  *
1228  * Returns true on success, false otherwise.
1229  */
1230 static bool tomoyo_print_condition(struct tomoyo_io_buffer *head,
1231                                    const struct tomoyo_condition *cond)
1232 {
1233         switch (head->r.cond_step) {
1234         case 0:
1235                 head->r.cond_index = 0;
1236                 head->r.cond_step++;
1237                 if (cond->transit) {
1238                         tomoyo_set_space(head);
1239                         tomoyo_set_string(head, cond->transit->name);
1240                 }
1241                 /* fall through */
1242         case 1:
1243                 {
1244                         const u16 condc = cond->condc;
1245                         const struct tomoyo_condition_element *condp =
1246                                 (typeof(condp)) (cond + 1);
1247                         const struct tomoyo_number_union *numbers_p =
1248                                 (typeof(numbers_p)) (condp + condc);
1249                         const struct tomoyo_name_union *names_p =
1250                                 (typeof(names_p))
1251                                 (numbers_p + cond->numbers_count);
1252                         const struct tomoyo_argv *argv =
1253                                 (typeof(argv)) (names_p + cond->names_count);
1254                         const struct tomoyo_envp *envp =
1255                                 (typeof(envp)) (argv + cond->argc);
1256                         u16 skip;
1257 
1258                         for (skip = 0; skip < head->r.cond_index; skip++) {
1259                                 const u8 left = condp->left;
1260                                 const u8 right = condp->right;
1261 
1262                                 condp++;
1263                                 switch (left) {
1264                                 case TOMOYO_ARGV_ENTRY:
1265                                         argv++;
1266                                         continue;
1267                                 case TOMOYO_ENVP_ENTRY:
1268                                         envp++;
1269                                         continue;
1270                                 case TOMOYO_NUMBER_UNION:
1271                                         numbers_p++;
1272                                         break;
1273                                 }
1274                                 switch (right) {
1275                                 case TOMOYO_NAME_UNION:
1276                                         names_p++;
1277                                         break;
1278                                 case TOMOYO_NUMBER_UNION:
1279                                         numbers_p++;
1280                                         break;
1281                                 }
1282                         }
1283                         while (head->r.cond_index < condc) {
1284                                 const u8 match = condp->equals;
1285                                 const u8 left = condp->left;
1286                                 const u8 right = condp->right;
1287 
1288                                 if (!tomoyo_flush(head))
1289                                         return false;
1290                                 condp++;
1291                                 head->r.cond_index++;
1292                                 tomoyo_set_space(head);
1293                                 switch (left) {
1294                                 case TOMOYO_ARGV_ENTRY:
1295                                         tomoyo_io_printf(head,
1296                                                          "exec.argv[%lu]%s=\"",
1297                                                          argv->index, argv->is_not ? "!" : "");
1298                                         tomoyo_set_string(head,
1299                                                           argv->value->name);
1300                                         tomoyo_set_string(head, "\"");
1301                                         argv++;
1302                                         continue;
1303                                 case TOMOYO_ENVP_ENTRY:
1304                                         tomoyo_set_string(head,
1305                                                           "exec.envp[\"");
1306                                         tomoyo_set_string(head,
1307                                                           envp->name->name);
1308                                         tomoyo_io_printf(head, "\"]%s=", envp->is_not ? "!" : "");
1309                                         if (envp->value) {
1310                                                 tomoyo_set_string(head, "\"");
1311                                                 tomoyo_set_string(head, envp->value->name);
1312                                                 tomoyo_set_string(head, "\"");
1313                                         } else {
1314                                                 tomoyo_set_string(head,
1315                                                                   "NULL");
1316                                         }
1317                                         envp++;
1318                                         continue;
1319                                 case TOMOYO_NUMBER_UNION:
1320                                         tomoyo_print_number_union_nospace
1321                                                 (head, numbers_p++);
1322                                         break;
1323                                 default:
1324                                         tomoyo_set_string(head,
1325                                                tomoyo_condition_keyword[left]);
1326                                         break;
1327                                 }
1328                                 tomoyo_set_string(head, match ? "=" : "!=");
1329                                 switch (right) {
1330                                 case TOMOYO_NAME_UNION:
1331                                         tomoyo_print_name_union_quoted
1332                                                 (head, names_p++);
1333                                         break;
1334                                 case TOMOYO_NUMBER_UNION:
1335                                         tomoyo_print_number_union_nospace
1336                                                 (head, numbers_p++);
1337                                         break;
1338                                 default:
1339                                         tomoyo_set_string(head,
1340                                           tomoyo_condition_keyword[right]);
1341                                         break;
1342                                 }
1343                         }
1344                 }
1345                 head->r.cond_step++;
1346                 /* fall through */
1347         case 2:
1348                 if (!tomoyo_flush(head))
1349                         break;
1350                 head->r.cond_step++;
1351                 /* fall through */
1352         case 3:
1353                 if (cond->grant_log != TOMOYO_GRANTLOG_AUTO)
1354                         tomoyo_io_printf(head, " grant_log=%s",
1355                                          tomoyo_yesno(cond->grant_log ==
1356                                                       TOMOYO_GRANTLOG_YES));
1357                 tomoyo_set_lf(head);
1358                 return true;
1359         }
1360         return false;
1361 }
1362 
1363 /**
1364  * tomoyo_set_group - Print "acl_group " header keyword and category name.
1365  *
1366  * @head:     Pointer to "struct tomoyo_io_buffer".
1367  * @category: Category name.
1368  *
1369  * Returns nothing.
1370  */
1371 static void tomoyo_set_group(struct tomoyo_io_buffer *head,
1372                              const char *category)
1373 {
1374         if (head->type == TOMOYO_EXCEPTIONPOLICY) {
1375                 tomoyo_print_namespace(head);
1376                 tomoyo_io_printf(head, "acl_group %u ",
1377                                  head->r.acl_group_index);
1378         }
1379         tomoyo_set_string(head, category);
1380 }
1381 
1382 /**
1383  * tomoyo_print_entry - Print an ACL entry.
1384  *
1385  * @head: Pointer to "struct tomoyo_io_buffer".
1386  * @acl:  Pointer to an ACL entry.
1387  *
1388  * Returns true on success, false otherwise.
1389  */
1390 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
1391                                struct tomoyo_acl_info *acl)
1392 {
1393         const u8 acl_type = acl->type;
1394         bool first = true;
1395         u8 bit;
1396 
1397         if (head->r.print_cond_part)
1398                 goto print_cond_part;
1399         if (acl->is_deleted)
1400                 return true;
1401         if (!tomoyo_flush(head))
1402                 return false;
1403         else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
1404                 struct tomoyo_path_acl *ptr =
1405                         container_of(acl, typeof(*ptr), head);
1406                 const u16 perm = ptr->perm;
1407 
1408                 for (bit = 0; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
1409                         if (!(perm & (1 << bit)))
1410                                 continue;
1411                         if (head->r.print_transition_related_only &&
1412                             bit != TOMOYO_TYPE_EXECUTE)
1413                                 continue;
1414                         if (first) {
1415                                 tomoyo_set_group(head, "file ");
1416                                 first = false;
1417                         } else {
1418                                 tomoyo_set_slash(head);
1419                         }
1420                         tomoyo_set_string(head, tomoyo_path_keyword[bit]);
1421                 }
1422                 if (first)
1423                         return true;
1424                 tomoyo_print_name_union(head, &ptr->name);
1425         } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
1426                 struct tomoyo_task_acl *ptr =
1427                         container_of(acl, typeof(*ptr), head);
1428 
1429                 tomoyo_set_group(head, "task ");
1430                 tomoyo_set_string(head, "manual_domain_transition ");
1431                 tomoyo_set_string(head, ptr->domainname->name);
1432         } else if (head->r.print_transition_related_only) {
1433                 return true;
1434         } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
1435                 struct tomoyo_path2_acl *ptr =
1436                         container_of(acl, typeof(*ptr), head);
1437                 const u8 perm = ptr->perm;
1438 
1439                 for (bit = 0; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
1440                         if (!(perm & (1 << bit)))
1441                                 continue;
1442                         if (first) {
1443                                 tomoyo_set_group(head, "file ");
1444                                 first = false;
1445                         } else {
1446                                 tomoyo_set_slash(head);
1447                         }
1448                         tomoyo_set_string(head, tomoyo_mac_keywords
1449                                           [tomoyo_pp2mac[bit]]);
1450                 }
1451                 if (first)
1452                         return true;
1453                 tomoyo_print_name_union(head, &ptr->name1);
1454                 tomoyo_print_name_union(head, &ptr->name2);
1455         } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
1456                 struct tomoyo_path_number_acl *ptr =
1457                         container_of(acl, typeof(*ptr), head);
1458                 const u8 perm = ptr->perm;
1459 
1460                 for (bit = 0; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION; bit++) {
1461                         if (!(perm & (1 << bit)))
1462                                 continue;
1463                         if (first) {
1464                                 tomoyo_set_group(head, "file ");
1465                                 first = false;
1466                         } else {
1467                                 tomoyo_set_slash(head);
1468                         }
1469                         tomoyo_set_string(head, tomoyo_mac_keywords
1470                                           [tomoyo_pn2mac[bit]]);
1471                 }
1472                 if (first)
1473                         return true;
1474                 tomoyo_print_name_union(head, &ptr->name);
1475                 tomoyo_print_number_union(head, &ptr->number);
1476         } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
1477                 struct tomoyo_mkdev_acl *ptr =
1478                         container_of(acl, typeof(*ptr), head);
1479                 const u8 perm = ptr->perm;
1480 
1481                 for (bit = 0; bit < TOMOYO_MAX_MKDEV_OPERATION; bit++) {
1482                         if (!(perm & (1 << bit)))
1483                                 continue;
1484                         if (first) {
1485                                 tomoyo_set_group(head, "file ");
1486                                 first = false;
1487                         } else {
1488                                 tomoyo_set_slash(head);
1489                         }
1490                         tomoyo_set_string(head, tomoyo_mac_keywords
1491                                           [tomoyo_pnnn2mac[bit]]);
1492                 }
1493                 if (first)
1494                         return true;
1495                 tomoyo_print_name_union(head, &ptr->name);
1496                 tomoyo_print_number_union(head, &ptr->mode);
1497                 tomoyo_print_number_union(head, &ptr->major);
1498                 tomoyo_print_number_union(head, &ptr->minor);
1499         } else if (acl_type == TOMOYO_TYPE_INET_ACL) {
1500                 struct tomoyo_inet_acl *ptr =
1501                         container_of(acl, typeof(*ptr), head);
1502                 const u8 perm = ptr->perm;
1503 
1504                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1505                         if (!(perm & (1 << bit)))
1506                                 continue;
1507                         if (first) {
1508                                 tomoyo_set_group(head, "network inet ");
1509                                 tomoyo_set_string(head, tomoyo_proto_keyword
1510                                                   [ptr->protocol]);
1511                                 tomoyo_set_space(head);
1512                                 first = false;
1513                         } else {
1514                                 tomoyo_set_slash(head);
1515                         }
1516                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1517                 }
1518                 if (first)
1519                         return true;
1520                 tomoyo_set_space(head);
1521                 if (ptr->address.group) {
1522                         tomoyo_set_string(head, "@");
1523                         tomoyo_set_string(head, ptr->address.group->group_name
1524                                           ->name);
1525                 } else {
1526                         char buf[128];
1527 
1528                         tomoyo_print_ip(buf, sizeof(buf), &ptr->address);
1529                         tomoyo_io_printf(head, "%s", buf);
1530                 }
1531                 tomoyo_print_number_union(head, &ptr->port);
1532         } else if (acl_type == TOMOYO_TYPE_UNIX_ACL) {
1533                 struct tomoyo_unix_acl *ptr =
1534                         container_of(acl, typeof(*ptr), head);
1535                 const u8 perm = ptr->perm;
1536 
1537                 for (bit = 0; bit < TOMOYO_MAX_NETWORK_OPERATION; bit++) {
1538                         if (!(perm & (1 << bit)))
1539                                 continue;
1540                         if (first) {
1541                                 tomoyo_set_group(head, "network unix ");
1542                                 tomoyo_set_string(head, tomoyo_proto_keyword
1543                                                   [ptr->protocol]);
1544                                 tomoyo_set_space(head);
1545                                 first = false;
1546                         } else {
1547                                 tomoyo_set_slash(head);
1548                         }
1549                         tomoyo_set_string(head, tomoyo_socket_keyword[bit]);
1550                 }
1551                 if (first)
1552                         return true;
1553                 tomoyo_print_name_union(head, &ptr->name);
1554         } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1555                 struct tomoyo_mount_acl *ptr =
1556                         container_of(acl, typeof(*ptr), head);
1557 
1558                 tomoyo_set_group(head, "file mount");
1559                 tomoyo_print_name_union(head, &ptr->dev_name);
1560                 tomoyo_print_name_union(head, &ptr->dir_name);
1561                 tomoyo_print_name_union(head, &ptr->fs_type);
1562                 tomoyo_print_number_union(head, &ptr->flags);
1563         } else if (acl_type == TOMOYO_TYPE_ENV_ACL) {
1564                 struct tomoyo_env_acl *ptr =
1565                         container_of(acl, typeof(*ptr), head);
1566 
1567                 tomoyo_set_group(head, "misc env ");
1568                 tomoyo_set_string(head, ptr->env->name);
1569         }
1570         if (acl->cond) {
1571                 head->r.print_cond_part = true;
1572                 head->r.cond_step = 0;
1573                 if (!tomoyo_flush(head))
1574                         return false;
1575 print_cond_part:
1576                 if (!tomoyo_print_condition(head, acl->cond))
1577                         return false;
1578                 head->r.print_cond_part = false;
1579         } else {
1580                 tomoyo_set_lf(head);
1581         }
1582         return true;
1583 }
1584 
1585 /**
1586  * tomoyo_read_domain2 - Read domain policy.
1587  *
1588  * @head: Pointer to "struct tomoyo_io_buffer".
1589  * @list: Pointer to "struct list_head".
1590  *
1591  * Caller holds tomoyo_read_lock().
1592  *
1593  * Returns true on success, false otherwise.
1594  */
1595 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1596                                 struct list_head *list)
1597 {
1598         list_for_each_cookie(head->r.acl, list) {
1599                 struct tomoyo_acl_info *ptr =
1600                         list_entry(head->r.acl, typeof(*ptr), list);
1601 
1602                 if (!tomoyo_print_entry(head, ptr))
1603                         return false;
1604         }
1605         head->r.acl = NULL;
1606         return true;
1607 }
1608 
1609 /**
1610  * tomoyo_read_domain - Read domain policy.
1611  *
1612  * @head: Pointer to "struct tomoyo_io_buffer".
1613  *
1614  * Caller holds tomoyo_read_lock().
1615  */
1616 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1617 {
1618         if (head->r.eof)
1619                 return;
1620         list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1621                 struct tomoyo_domain_info *domain =
1622                         list_entry(head->r.domain, typeof(*domain), list);
1623                 u8 i;
1624 
1625                 switch (head->r.step) {
1626                 case 0:
1627                         if (domain->is_deleted &&
1628                             !head->r.print_this_domain_only)
1629                                 continue;
1630                         /* Print domainname and flags. */
1631                         tomoyo_set_string(head, domain->domainname->name);
1632                         tomoyo_set_lf(head);
1633                         tomoyo_io_printf(head, "use_profile %u\n",
1634                                          domain->profile);
1635                         for (i = 0; i < TOMOYO_MAX_DOMAIN_INFO_FLAGS; i++)
1636                                 if (domain->flags[i])
1637                                         tomoyo_set_string(head, tomoyo_dif[i]);
1638                         head->r.index = 0;
1639                         head->r.step++;
1640                         /* fall through */
1641                 case 1:
1642                         while (head->r.index < TOMOYO_MAX_ACL_GROUPS) {
1643                                 i = head->r.index++;
1644                                 if (!test_bit(i, domain->group))
1645                                         continue;
1646                                 tomoyo_io_printf(head, "use_group %u\n", i);
1647                                 if (!tomoyo_flush(head))
1648                                         return;
1649                         }
1650                         head->r.index = 0;
1651                         head->r.step++;
1652                         tomoyo_set_lf(head);
1653                         /* fall through */
1654                 case 2:
1655                         if (!tomoyo_read_domain2(head, &domain->acl_info_list))
1656                                 return;
1657                         head->r.step++;
1658                         if (!tomoyo_set_lf(head))
1659                                 return;
1660                         /* fall through */
1661                 case 3:
1662                         head->r.step = 0;
1663                         if (head->r.print_this_domain_only)
1664                                 goto done;
1665                 }
1666         }
1667  done:
1668         head->r.eof = true;
1669 }
1670 
1671 /**
1672  * tomoyo_write_pid: Specify PID to obtain domainname.
1673  *
1674  * @head: Pointer to "struct tomoyo_io_buffer".
1675  *
1676  * Returns 0.
1677  */
1678 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1679 {
1680         head->r.eof = false;
1681         return 0;
1682 }
1683 
1684 /**
1685  * tomoyo_read_pid - Get domainname of the specified PID.
1686  *
1687  * @head: Pointer to "struct tomoyo_io_buffer".
1688  *
1689  * Returns the domainname which the specified PID is in on success,
1690  * empty string otherwise.
1691  * The PID is specified by tomoyo_write_pid() so that the user can obtain
1692  * using read()/write() interface rather than sysctl() interface.
1693  */
1694 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1695 {
1696         char *buf = head->write_buf;
1697         bool global_pid = false;
1698         unsigned int pid;
1699         struct task_struct *p;
1700         struct tomoyo_domain_info *domain = NULL;
1701 
1702         /* Accessing write_buf is safe because head->io_sem is held. */
1703         if (!buf) {
1704                 head->r.eof = true;
1705                 return; /* Do nothing if open(O_RDONLY). */
1706         }
1707         if (head->r.w_pos || head->r.eof)
1708                 return;
1709         head->r.eof = true;
1710         if (tomoyo_str_starts(&buf, "global-pid "))
1711                 global_pid = true;
1712         if (kstrtouint(buf, 10, &pid))
1713                 return;
1714         rcu_read_lock();
1715         if (global_pid)
1716                 p = find_task_by_pid_ns(pid, &init_pid_ns);
1717         else
1718                 p = find_task_by_vpid(pid);
1719         if (p)
1720                 domain = tomoyo_task(p)->domain_info;
1721         rcu_read_unlock();
1722         if (!domain)
1723                 return;
1724         tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1725         tomoyo_set_string(head, domain->domainname->name);
1726 }
1727 
1728 /* String table for domain transition control keywords. */
1729 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1730         [TOMOYO_TRANSITION_CONTROL_NO_RESET]      = "no_reset_domain ",
1731         [TOMOYO_TRANSITION_CONTROL_RESET]         = "reset_domain ",
1732         [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain ",
1733         [TOMOYO_TRANSITION_CONTROL_INITIALIZE]    = "initialize_domain ",
1734         [TOMOYO_TRANSITION_CONTROL_NO_KEEP]       = "no_keep_domain ",
1735         [TOMOYO_TRANSITION_CONTROL_KEEP]          = "keep_domain ",
1736 };
1737 
1738 /* String table for grouping keywords. */
1739 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1740         [TOMOYO_PATH_GROUP]    = "path_group ",
1741         [TOMOYO_NUMBER_GROUP]  = "number_group ",
1742         [TOMOYO_ADDRESS_GROUP] = "address_group ",
1743 };
1744 
1745 /**
1746  * tomoyo_write_exception - Write exception policy.
1747  *
1748  * @head: Pointer to "struct tomoyo_io_buffer".
1749  *
1750  * Returns 0 on success, negative value otherwise.
1751  *
1752  * Caller holds tomoyo_read_lock().
1753  */
1754 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1755 {
1756         const bool is_delete = head->w.is_delete;
1757         struct tomoyo_acl_param param = {
1758                 .ns = head->w.ns,
1759                 .is_delete = is_delete,
1760                 .data = head->write_buf,
1761         };
1762         u8 i;
1763 
1764         if (tomoyo_str_starts(&param.data, "aggregator "))
1765                 return tomoyo_write_aggregator(&param);
1766         for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1767                 if (tomoyo_str_starts(&param.data, tomoyo_transition_type[i]))
1768                         return tomoyo_write_transition_control(&param, i);
1769         for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1770                 if (tomoyo_str_starts(&param.data, tomoyo_group_name[i]))
1771                         return tomoyo_write_group(&param, i);
1772         if (tomoyo_str_starts(&param.data, "acl_group ")) {
1773                 unsigned int group;
1774                 char *data;
1775 
1776                 group = simple_strtoul(param.data, &data, 10);
1777                 if (group < TOMOYO_MAX_ACL_GROUPS && *data++ == ' ')
1778                         return tomoyo_write_domain2
1779                                 (head->w.ns, &head->w.ns->acl_group[group],
1780                                  data, is_delete);
1781         }
1782         return -EINVAL;
1783 }
1784 
1785 /**
1786  * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group"/"struct tomoyo_address_group" list.
1787  *
1788  * @head: Pointer to "struct tomoyo_io_buffer".
1789  * @idx:  Index number.
1790  *
1791  * Returns true on success, false otherwise.
1792  *
1793  * Caller holds tomoyo_read_lock().
1794  */
1795 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1796 {
1797         struct tomoyo_policy_namespace *ns =
1798                 container_of(head->r.ns, typeof(*ns), namespace_list);
1799         struct list_head *list = &ns->group_list[idx];
1800 
1801         list_for_each_cookie(head->r.group, list) {
1802                 struct tomoyo_group *group =
1803                         list_entry(head->r.group, typeof(*group), head.list);
1804 
1805                 list_for_each_cookie(head->r.acl, &group->member_list) {
1806                         struct tomoyo_acl_head *ptr =
1807                                 list_entry(head->r.acl, typeof(*ptr), list);
1808 
1809                         if (ptr->is_deleted)
1810                                 continue;
1811                         if (!tomoyo_flush(head))
1812                                 return false;
1813                         tomoyo_print_namespace(head);
1814                         tomoyo_set_string(head, tomoyo_group_name[idx]);
1815                         tomoyo_set_string(head, group->group_name->name);
1816                         if (idx == TOMOYO_PATH_GROUP) {
1817                                 tomoyo_set_space(head);
1818                                 tomoyo_set_string(head, container_of
1819                                                (ptr, struct tomoyo_path_group,
1820                                                 head)->member_name->name);
1821                         } else if (idx == TOMOYO_NUMBER_GROUP) {
1822                                 tomoyo_print_number_union(head, &container_of
1823                                                           (ptr,
1824                                                    struct tomoyo_number_group,
1825                                                            head)->number);
1826                         } else if (idx == TOMOYO_ADDRESS_GROUP) {
1827                                 char buffer[128];
1828                                 struct tomoyo_address_group *member =
1829                                         container_of(ptr, typeof(*member),
1830                                                      head);
1831 
1832                                 tomoyo_print_ip(buffer, sizeof(buffer),
1833                                                 &member->address);
1834                                 tomoyo_io_printf(head, " %s", buffer);
1835                         }
1836                         tomoyo_set_lf(head);
1837                 }
1838                 head->r.acl = NULL;
1839         }
1840         head->r.group = NULL;
1841         return true;
1842 }
1843 
1844 /**
1845  * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1846  *
1847  * @head: Pointer to "struct tomoyo_io_buffer".
1848  * @idx:  Index number.
1849  *
1850  * Returns true on success, false otherwise.
1851  *
1852  * Caller holds tomoyo_read_lock().
1853  */
1854 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1855 {
1856         struct tomoyo_policy_namespace *ns =
1857                 container_of(head->r.ns, typeof(*ns), namespace_list);
1858         struct list_head *list = &ns->policy_list[idx];
1859 
1860         list_for_each_cookie(head->r.acl, list) {
1861                 struct tomoyo_acl_head *acl =
1862                         container_of(head->r.acl, typeof(*acl), list);
1863                 if (acl->is_deleted)
1864                         continue;
1865                 if (!tomoyo_flush(head))
1866                         return false;
1867                 switch (idx) {
1868                 case TOMOYO_ID_TRANSITION_CONTROL:
1869                         {
1870                                 struct tomoyo_transition_control *ptr =
1871                                         container_of(acl, typeof(*ptr), head);
1872 
1873                                 tomoyo_print_namespace(head);
1874                                 tomoyo_set_string(head, tomoyo_transition_type
1875                                                   [ptr->type]);
1876                                 tomoyo_set_string(head, ptr->program ?
1877                                                   ptr->program->name : "any");
1878                                 tomoyo_set_string(head, " from ");
1879                                 tomoyo_set_string(head, ptr->domainname ?
1880                                                   ptr->domainname->name :
1881                                                   "any");
1882                         }
1883                         break;
1884                 case TOMOYO_ID_AGGREGATOR:
1885                         {
1886                                 struct tomoyo_aggregator *ptr =
1887                                         container_of(acl, typeof(*ptr), head);
1888 
1889                                 tomoyo_print_namespace(head);
1890                                 tomoyo_set_string(head, "aggregator ");
1891                                 tomoyo_set_string(head,
1892                                                   ptr->original_name->name);
1893                                 tomoyo_set_space(head);
1894                                 tomoyo_set_string(head,
1895                                                ptr->aggregated_name->name);
1896                         }
1897                         break;
1898                 default:
1899                         continue;
1900                 }
1901                 tomoyo_set_lf(head);
1902         }
1903         head->r.acl = NULL;
1904         return true;
1905 }
1906 
1907 /**
1908  * tomoyo_read_exception - Read exception policy.
1909  *
1910  * @head: Pointer to "struct tomoyo_io_buffer".
1911  *
1912  * Caller holds tomoyo_read_lock().
1913  */
1914 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1915 {
1916         struct tomoyo_policy_namespace *ns =
1917                 container_of(head->r.ns, typeof(*ns), namespace_list);
1918 
1919         if (head->r.eof)
1920                 return;
1921         while (head->r.step < TOMOYO_MAX_POLICY &&
1922                tomoyo_read_policy(head, head->r.step))
1923                 head->r.step++;
1924         if (head->r.step < TOMOYO_MAX_POLICY)
1925                 return;
1926         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1927                tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1928                 head->r.step++;
1929         if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1930                 return;
1931         while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP
1932                + TOMOYO_MAX_ACL_GROUPS) {
1933                 head->r.acl_group_index = head->r.step - TOMOYO_MAX_POLICY
1934                         - TOMOYO_MAX_GROUP;
1935                 if (!tomoyo_read_domain2(head, &ns->acl_group
1936                                          [head->r.acl_group_index]))
1937                         return;
1938                 head->r.step++;
1939         }
1940         head->r.eof = true;
1941 }
1942 
1943 /* Wait queue for kernel -> userspace notification. */
1944 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1945 /* Wait queue for userspace -> kernel notification. */
1946 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_answer_wait);
1947 
1948 /* Structure for query. */
1949 struct tomoyo_query {
1950         struct list_head list;
1951         struct tomoyo_domain_info *domain;
1952         char *query;
1953         size_t query_len;
1954         unsigned int serial;
1955         u8 timer;
1956         u8 answer;
1957         u8 retry;
1958 };
1959 
1960 /* The list for "struct tomoyo_query". */
1961 static LIST_HEAD(tomoyo_query_list);
1962 
1963 /* Lock for manipulating tomoyo_query_list. */
1964 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1965 
1966 /*
1967  * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1968  * interface.
1969  */
1970 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1971 
1972 /**
1973  * tomoyo_truncate - Truncate a line.
1974  *
1975  * @str: String to truncate.
1976  *
1977  * Returns length of truncated @str.
1978  */
1979 static int tomoyo_truncate(char *str)
1980 {
1981         char *start = str;
1982 
1983         while (*(unsigned char *) str > (unsigned char) ' ')
1984                 str++;
1985         *str = '\0';
1986         return strlen(start) + 1;
1987 }
1988 
1989 /**
1990  * tomoyo_add_entry - Add an ACL to current thread's domain. Used by learning mode.
1991  *
1992  * @domain: Pointer to "struct tomoyo_domain_info".
1993  * @header: Lines containing ACL.
1994  *
1995  * Returns nothing.
1996  */
1997 static void tomoyo_add_entry(struct tomoyo_domain_info *domain, char *header)
1998 {
1999         char *buffer;
2000         char *realpath = NULL;
2001         char *argv0 = NULL;
2002         char *symlink = NULL;
2003         char *cp = strchr(header, '\n');
2004         int len;
2005 
2006         if (!cp)
2007                 return;
2008         cp = strchr(cp + 1, '\n');
2009         if (!cp)
2010                 return;
2011         *cp++ = '\0';
2012         len = strlen(cp) + 1;
2013         /* strstr() will return NULL if ordering is wrong. */
2014         if (*cp == 'f') {
2015                 argv0 = strstr(header, " argv[]={ \"");
2016                 if (argv0) {
2017                         argv0 += 10;
2018                         len += tomoyo_truncate(argv0) + 14;
2019                 }
2020                 realpath = strstr(header, " exec={ realpath=\"");
2021                 if (realpath) {
2022                         realpath += 8;
2023                         len += tomoyo_truncate(realpath) + 6;
2024                 }
2025                 symlink = strstr(header, " symlink.target=\"");
2026                 if (symlink)
2027                         len += tomoyo_truncate(symlink + 1) + 1;
2028         }
2029         buffer = kmalloc(len, GFP_NOFS);
2030         if (!buffer)
2031                 return;
2032         snprintf(buffer, len - 1, "%s", cp);
2033         if (realpath)
2034                 tomoyo_addprintf(buffer, len, " exec.%s", realpath);
2035         if (argv0)
2036                 tomoyo_addprintf(buffer, len, " exec.argv[0]=%s", argv0);
2037         if (symlink)
2038                 tomoyo_addprintf(buffer, len, "%s", symlink);
2039         tomoyo_normalize_line(buffer);
2040         if (!tomoyo_write_domain2(domain->ns, &domain->acl_info_list, buffer,
2041                                   false))
2042                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2043         kfree(buffer);
2044 }
2045 
2046 /**
2047  * tomoyo_supervisor - Ask for the supervisor's decision.
2048  *
2049  * @r:   Pointer to "struct tomoyo_request_info".
2050  * @fmt: The printf()'s format string, followed by parameters.
2051  *
2052  * Returns 0 if the supervisor decided to permit the access request which
2053  * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
2054  * supervisor decided to retry the access request which violated the policy in
2055  * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
2056  */
2057 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
2058 {
2059         va_list args;
2060         int error;
2061         int len;
2062         static unsigned int tomoyo_serial;
2063         struct tomoyo_query entry = { };
2064         bool quota_exceeded = false;
2065 
2066         va_start(args, fmt);
2067         len = vsnprintf((char *) &len, 1, fmt, args) + 1;
2068         va_end(args);
2069         /* Write /sys/kernel/security/tomoyo/audit. */
2070         va_start(args, fmt);
2071         tomoyo_write_log2(r, len, fmt, args);
2072         va_end(args);
2073         /* Nothing more to do if granted. */
2074         if (r->granted)
2075                 return 0;
2076         if (r->mode)
2077                 tomoyo_update_stat(r->mode);
2078         switch (r->mode) {
2079         case TOMOYO_CONFIG_ENFORCING:
2080                 error = -EPERM;
2081                 if (atomic_read(&tomoyo_query_observers))
2082                         break;
2083                 goto out;
2084         case TOMOYO_CONFIG_LEARNING:
2085                 error = 0;
2086                 /* Check max_learning_entry parameter. */
2087                 if (tomoyo_domain_quota_is_ok(r))
2088                         break;
2089                 /* fall through */
2090         default:
2091                 return 0;
2092         }
2093         /* Get message. */
2094         va_start(args, fmt);
2095         entry.query = tomoyo_init_log(r, len, fmt, args);
2096         va_end(args);
2097         if (!entry.query)
2098                 goto out;
2099         entry.query_len = strlen(entry.query) + 1;
2100         if (!error) {
2101                 tomoyo_add_entry(r->domain, entry.query);
2102                 goto out;
2103         }
2104         len = tomoyo_round2(entry.query_len);
2105         entry.domain = r->domain;
2106         spin_lock(&tomoyo_query_list_lock);
2107         if (tomoyo_memory_quota[TOMOYO_MEMORY_QUERY] &&
2108             tomoyo_memory_used[TOMOYO_MEMORY_QUERY] + len
2109             >= tomoyo_memory_quota[TOMOYO_MEMORY_QUERY]) {
2110                 quota_exceeded = true;
2111         } else {
2112                 entry.serial = tomoyo_serial++;
2113                 entry.retry = r->retry;
2114                 tomoyo_memory_used[TOMOYO_MEMORY_QUERY] += len;
2115                 list_add_tail(&entry.list, &tomoyo_query_list);
2116         }
2117         spin_unlock(&tomoyo_query_list_lock);
2118         if (quota_exceeded)
2119                 goto out;
2120         /* Give 10 seconds for supervisor's opinion. */
2121         while (entry.timer < 10) {
2122                 wake_up_all(&tomoyo_query_wait);
2123                 if (wait_event_interruptible_timeout
2124                     (tomoyo_answer_wait, entry.answer ||
2125                      !atomic_read(&tomoyo_query_observers), HZ))
2126                         break;
2127                 entry.timer++;
2128         }
2129         spin_lock(&tomoyo_query_list_lock);
2130         list_del(&entry.list);
2131         tomoyo_memory_used[TOMOYO_MEMORY_QUERY] -= len;
2132         spin_unlock(&tomoyo_query_list_lock);
2133         switch (entry.answer) {
2134         case 3: /* Asked to retry by administrator. */
2135                 error = TOMOYO_RETRY_REQUEST;
2136                 r->retry++;
2137                 break;
2138         case 1:
2139                 /* Granted by administrator. */
2140                 error = 0;
2141                 break;
2142         default:
2143                 /* Timed out or rejected by administrator. */
2144                 break;
2145         }
2146 out:
2147         kfree(entry.query);
2148         return error;
2149 }
2150 
2151 /**
2152  * tomoyo_find_domain_by_qid - Get domain by query id.
2153  *
2154  * @serial: Query ID assigned by tomoyo_supervisor().
2155  *
2156  * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
2157  */
2158 static struct tomoyo_domain_info *tomoyo_find_domain_by_qid
2159 (unsigned int serial)
2160 {
2161         struct tomoyo_query *ptr;
2162         struct tomoyo_domain_info *domain = NULL;
2163 
2164         spin_lock(&tomoyo_query_list_lock);
2165         list_for_each_entry(ptr, &tomoyo_query_list, list) {
2166                 if (ptr->serial != serial)
2167                         continue;
2168                 domain = ptr->domain;
2169                 break;
2170         }
2171         spin_unlock(&tomoyo_query_list_lock);
2172         return domain;
2173 }
2174 
2175 /**
2176  * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
2177  *
2178  * @file: Pointer to "struct file".
2179  * @wait: Pointer to "poll_table".
2180  *
2181  * Returns EPOLLIN | EPOLLRDNORM when ready to read, 0 otherwise.
2182  *
2183  * Waits for access requests which violated policy in enforcing mode.
2184  */
2185 static __poll_t tomoyo_poll_query(struct file *file, poll_table *wait)
2186 {
2187         if (!list_empty(&tomoyo_query_list))
2188                 return EPOLLIN | EPOLLRDNORM;
2189         poll_wait(file, &tomoyo_query_wait, wait);
2190         if (!list_empty(&tomoyo_query_list))
2191                 return EPOLLIN | EPOLLRDNORM;
2192         return 0;
2193 }
2194 
2195 /**
2196  * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
2197  *
2198  * @head: Pointer to "struct tomoyo_io_buffer".
2199  */
2200 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
2201 {
2202         struct list_head *tmp;
2203         unsigned int pos = 0;
2204         size_t len = 0;
2205         char *buf;
2206 
2207         if (head->r.w_pos)
2208                 return;
2209         kfree(head->read_buf);
2210         head->read_buf = NULL;
2211         spin_lock(&tomoyo_query_list_lock);
2212         list_for_each(tmp, &tomoyo_query_list) {
2213                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2214 
2215                 if (pos++ != head->r.query_index)
2216                         continue;
2217                 len = ptr->query_len;
2218                 break;
2219         }
2220         spin_unlock(&tomoyo_query_list_lock);
2221         if (!len) {
2222                 head->r.query_index = 0;
2223                 return;
2224         }
2225         buf = kzalloc(len + 32, GFP_NOFS);
2226         if (!buf)
2227                 return;
2228         pos = 0;
2229         spin_lock(&tomoyo_query_list_lock);
2230         list_for_each(tmp, &tomoyo_query_list) {
2231                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2232 
2233                 if (pos++ != head->r.query_index)
2234                         continue;
2235                 /*
2236                  * Some query can be skipped because tomoyo_query_list
2237                  * can change, but I don't care.
2238                  */
2239                 if (len == ptr->query_len)
2240                         snprintf(buf, len + 31, "Q%u-%hu\n%s", ptr->serial,
2241                                  ptr->retry, ptr->query);
2242                 break;
2243         }
2244         spin_unlock(&tomoyo_query_list_lock);
2245         if (buf[0]) {
2246                 head->read_buf = buf;
2247                 head->r.w[head->r.w_pos++] = buf;
2248                 head->r.query_index++;
2249         } else {
2250                 kfree(buf);
2251         }
2252 }
2253 
2254 /**
2255  * tomoyo_write_answer - Write the supervisor's decision.
2256  *
2257  * @head: Pointer to "struct tomoyo_io_buffer".
2258  *
2259  * Returns 0 on success, -EINVAL otherwise.
2260  */
2261 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
2262 {
2263         char *data = head->write_buf;
2264         struct list_head *tmp;
2265         unsigned int serial;
2266         unsigned int answer;
2267 
2268         spin_lock(&tomoyo_query_list_lock);
2269         list_for_each(tmp, &tomoyo_query_list) {
2270                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2271 
2272                 ptr->timer = 0;
2273         }
2274         spin_unlock(&tomoyo_query_list_lock);
2275         if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
2276                 return -EINVAL;
2277         spin_lock(&tomoyo_query_list_lock);
2278         list_for_each(tmp, &tomoyo_query_list) {
2279                 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
2280 
2281                 if (ptr->serial != serial)
2282                         continue;
2283                 ptr->answer = answer;
2284                 /* Remove from tomoyo_query_list. */
2285                 if (ptr->answer)
2286                         list_del_init(&ptr->list);
2287                 break;
2288         }
2289         spin_unlock(&tomoyo_query_list_lock);
2290         return 0;
2291 }
2292 
2293 /**
2294  * tomoyo_read_version: Get version.
2295  *
2296  * @head: Pointer to "struct tomoyo_io_buffer".
2297  *
2298  * Returns version information.
2299  */
2300 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
2301 {
2302         if (!head->r.eof) {
2303                 tomoyo_io_printf(head, "2.6.0");
2304                 head->r.eof = true;
2305         }
2306 }
2307 
2308 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2309 static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
2310         [TOMOYO_STAT_POLICY_UPDATES]    = "update:",
2311         [TOMOYO_STAT_POLICY_LEARNING]   = "violation in learning mode:",
2312         [TOMOYO_STAT_POLICY_PERMISSIVE] = "violation in permissive mode:",
2313         [TOMOYO_STAT_POLICY_ENFORCING]  = "violation in enforcing mode:",
2314 };
2315 
2316 /* String table for /sys/kernel/security/tomoyo/stat interface. */
2317 static const char * const tomoyo_memory_headers[TOMOYO_MAX_MEMORY_STAT] = {
2318         [TOMOYO_MEMORY_POLICY] = "policy:",
2319         [TOMOYO_MEMORY_AUDIT]  = "audit log:",
2320         [TOMOYO_MEMORY_QUERY]  = "query message:",
2321 };
2322 
2323 /* Timestamp counter for last updated. */
2324 static unsigned int tomoyo_stat_updated[TOMOYO_MAX_POLICY_STAT];
2325 /* Counter for number of updates. */
2326 static time64_t tomoyo_stat_modified[TOMOYO_MAX_POLICY_STAT];
2327 
2328 /**
2329  * tomoyo_update_stat - Update statistic counters.
2330  *
2331  * @index: Index for policy type.
2332  *
2333  * Returns nothing.
2334  */
2335 void tomoyo_update_stat(const u8 index)
2336 {
2337         /*
2338          * I don't use atomic operations because race condition is not fatal.
2339          */
2340         tomoyo_stat_updated[index]++;
2341         tomoyo_stat_modified[index] = ktime_get_real_seconds();
2342 }
2343 
2344 /**
2345  * tomoyo_read_stat - Read statistic data.
2346  *
2347  * @head: Pointer to "struct tomoyo_io_buffer".
2348  *
2349  * Returns nothing.
2350  */
2351 static void tomoyo_read_stat(struct tomoyo_io_buffer *head)
2352 {
2353         u8 i;
2354         unsigned int total = 0;
2355 
2356         if (head->r.eof)
2357                 return;
2358         for (i = 0; i < TOMOYO_MAX_POLICY_STAT; i++) {
2359                 tomoyo_io_printf(head, "Policy %-30s %10u",
2360                                  tomoyo_policy_headers[i],
2361                                  tomoyo_stat_updated[i]);
2362                 if (tomoyo_stat_modified[i]) {
2363                         struct tomoyo_time stamp;
2364 
2365                         tomoyo_convert_time(tomoyo_stat_modified[i], &stamp);
2366                         tomoyo_io_printf(head, " (Last: %04u/%02u/%02u %02u:%02u:%02u)",
2367                                          stamp.year, stamp.month, stamp.day,
2368                                          stamp.hour, stamp.min, stamp.sec);
2369                 }
2370                 tomoyo_set_lf(head);
2371         }
2372         for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++) {
2373                 unsigned int used = tomoyo_memory_used[i];
2374 
2375                 total += used;
2376                 tomoyo_io_printf(head, "Memory used by %-22s %10u",
2377                                  tomoyo_memory_headers[i], used);
2378                 used = tomoyo_memory_quota[i];
2379                 if (used)
2380                         tomoyo_io_printf(head, " (Quota: %10u)", used);
2381                 tomoyo_set_lf(head);
2382         }
2383         tomoyo_io_printf(head, "Total memory used:                    %10u\n",
2384                          total);
2385         head->r.eof = true;
2386 }
2387 
2388 /**
2389  * tomoyo_write_stat - Set memory quota.
2390  *
2391  * @head: Pointer to "struct tomoyo_io_buffer".
2392  *
2393  * Returns 0.
2394  */
2395 static int tomoyo_write_stat(struct tomoyo_io_buffer *head)
2396 {
2397         char *data = head->write_buf;
2398         u8 i;
2399 
2400         if (tomoyo_str_starts(&data, "Memory used by "))
2401                 for (i = 0; i < TOMOYO_MAX_MEMORY_STAT; i++)
2402                         if (tomoyo_str_starts(&data, tomoyo_memory_headers[i]))
2403                                 sscanf(data, "%u", &tomoyo_memory_quota[i]);
2404         return 0;
2405 }
2406 
2407 /**
2408  * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
2409  *
2410  * @type: Type of interface.
2411  * @file: Pointer to "struct file".
2412  *
2413  * Returns 0 on success, negative value otherwise.
2414  */
2415 int tomoyo_open_control(const u8 type, struct file *file)
2416 {
2417         struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
2418 
2419         if (!head)
2420                 return -ENOMEM;
2421         mutex_init(&head->io_sem);
2422         head->type = type;
2423         switch (type) {
2424         case TOMOYO_DOMAINPOLICY:
2425                 /* /sys/kernel/security/tomoyo/domain_policy */
2426                 head->write = tomoyo_write_domain;
2427                 head->read = tomoyo_read_domain;
2428                 break;
2429         case TOMOYO_EXCEPTIONPOLICY:
2430                 /* /sys/kernel/security/tomoyo/exception_policy */
2431                 head->write = tomoyo_write_exception;
2432                 head->read = tomoyo_read_exception;
2433                 break;
2434         case TOMOYO_AUDIT:
2435                 /* /sys/kernel/security/tomoyo/audit */
2436                 head->poll = tomoyo_poll_log;
2437                 head->read = tomoyo_read_log;
2438                 break;
2439         case TOMOYO_PROCESS_STATUS:
2440                 /* /sys/kernel/security/tomoyo/.process_status */
2441                 head->write = tomoyo_write_pid;
2442                 head->read = tomoyo_read_pid;
2443                 break;
2444         case TOMOYO_VERSION:
2445                 /* /sys/kernel/security/tomoyo/version */
2446                 head->read = tomoyo_read_version;
2447                 head->readbuf_size = 128;
2448                 break;
2449         case TOMOYO_STAT:
2450                 /* /sys/kernel/security/tomoyo/stat */
2451                 head->write = tomoyo_write_stat;
2452                 head->read = tomoyo_read_stat;
2453                 head->readbuf_size = 1024;
2454                 break;
2455         case TOMOYO_PROFILE:
2456                 /* /sys/kernel/security/tomoyo/profile */
2457                 head->write = tomoyo_write_profile;
2458                 head->read = tomoyo_read_profile;
2459                 break;
2460         case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
2461                 head->poll = tomoyo_poll_query;
2462                 head->write = tomoyo_write_answer;
2463                 head->read = tomoyo_read_query;
2464                 break;
2465         case TOMOYO_MANAGER:
2466                 /* /sys/kernel/security/tomoyo/manager */
2467                 head->write = tomoyo_write_manager;
2468                 head->read = tomoyo_read_manager;
2469                 break;
2470         }
2471         if (!(file->f_mode & FMODE_READ)) {
2472                 /*
2473                  * No need to allocate read_buf since it is not opened
2474                  * for reading.
2475                  */
2476                 head->read = NULL;
2477                 head->poll = NULL;
2478         } else if (!head->poll) {
2479                 /* Don't allocate read_buf for poll() access. */
2480                 if (!head->readbuf_size)
2481                         head->readbuf_size = 4096 * 2;
2482                 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
2483                 if (!head->read_buf) {
2484                         kfree(head);
2485                         return -ENOMEM;
2486                 }
2487         }
2488         if (!(file->f_mode & FMODE_WRITE)) {
2489                 /*
2490                  * No need to allocate write_buf since it is not opened
2491                  * for writing.
2492                  */
2493                 head->write = NULL;
2494         } else if (head->write) {
2495                 head->writebuf_size = 4096 * 2;
2496                 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
2497                 if (!head->write_buf) {
2498                         kfree(head->read_buf);
2499                         kfree(head);
2500                         return -ENOMEM;
2501                 }
2502         }
2503         /*
2504          * If the file is /sys/kernel/security/tomoyo/query , increment the
2505          * observer counter.
2506          * The obserber counter is used by tomoyo_supervisor() to see if
2507          * there is some process monitoring /sys/kernel/security/tomoyo/query.
2508          */
2509         if (type == TOMOYO_QUERY)
2510                 atomic_inc(&tomoyo_query_observers);
2511         file->private_data = head;
2512         tomoyo_notify_gc(head, true);
2513         return 0;
2514 }
2515 
2516 /**
2517  * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
2518  *
2519  * @file: Pointer to "struct file".
2520  * @wait: Pointer to "poll_table". Maybe NULL.
2521  *
2522  * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
2523  * EPOLLOUT | EPOLLWRNORM otherwise.
2524  */
2525 __poll_t tomoyo_poll_control(struct file *file, poll_table *wait)
2526 {
2527         struct tomoyo_io_buffer *head = file->private_data;
2528 
2529         if (head->poll)
2530                 return head->poll(file, wait) | EPOLLOUT | EPOLLWRNORM;
2531         return EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM;
2532 }
2533 
2534 /**
2535  * tomoyo_set_namespace_cursor - Set namespace to read.
2536  *
2537  * @head: Pointer to "struct tomoyo_io_buffer".
2538  *
2539  * Returns nothing.
2540  */
2541 static inline void tomoyo_set_namespace_cursor(struct tomoyo_io_buffer *head)
2542 {
2543         struct list_head *ns;
2544 
2545         if (head->type != TOMOYO_EXCEPTIONPOLICY &&
2546             head->type != TOMOYO_PROFILE)
2547                 return;
2548         /*
2549          * If this is the first read, or reading previous namespace finished
2550          * and has more namespaces to read, update the namespace cursor.
2551          */
2552         ns = head->r.ns;
2553         if (!ns || (head->r.eof && ns->next != &tomoyo_namespace_list)) {
2554                 /* Clearing is OK because tomoyo_flush() returned true. */
2555                 memset(&head->r, 0, sizeof(head->r));
2556                 head->r.ns = ns ? ns->next : tomoyo_namespace_list.next;
2557         }
2558 }
2559 
2560 /**
2561  * tomoyo_has_more_namespace - Check for unread namespaces.
2562  *
2563  * @head: Pointer to "struct tomoyo_io_buffer".
2564  *
2565  * Returns true if we have more entries to print, false otherwise.
2566  */
2567 static inline bool tomoyo_has_more_namespace(struct tomoyo_io_buffer *head)
2568 {
2569         return (head->type == TOMOYO_EXCEPTIONPOLICY ||
2570                 head->type == TOMOYO_PROFILE) && head->r.eof &&
2571                 head->r.ns->next != &tomoyo_namespace_list;
2572 }
2573 
2574 /**
2575  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
2576  *
2577  * @head:       Pointer to "struct tomoyo_io_buffer".
2578  * @buffer:     Poiner to buffer to write to.
2579  * @buffer_len: Size of @buffer.
2580  *
2581  * Returns bytes read on success, negative value otherwise.
2582  */
2583 ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
2584                             const int buffer_len)
2585 {
2586         int len;
2587         int idx;
2588 
2589         if (!head->read)
2590                 return -EINVAL;
2591         if (mutex_lock_interruptible(&head->io_sem))
2592                 return -EINTR;
2593         head->read_user_buf = buffer;
2594         head->read_user_buf_avail = buffer_len;
2595         idx = tomoyo_read_lock();
2596         if (tomoyo_flush(head))
2597                 /* Call the policy handler. */
2598                 do {
2599                         tomoyo_set_namespace_cursor(head);
2600                         head->read(head);
2601                 } while (tomoyo_flush(head) &&
2602                          tomoyo_has_more_namespace(head));
2603         tomoyo_read_unlock(idx);
2604         len = head->read_user_buf - buffer;
2605         mutex_unlock(&head->io_sem);
2606         return len;
2607 }
2608 
2609 /**
2610  * tomoyo_parse_policy - Parse a policy line.
2611  *
2612  * @head: Poiter to "struct tomoyo_io_buffer".
2613  * @line: Line to parse.
2614  *
2615  * Returns 0 on success, negative value otherwise.
2616  *
2617  * Caller holds tomoyo_read_lock().
2618  */
2619 static int tomoyo_parse_policy(struct tomoyo_io_buffer *head, char *line)
2620 {
2621         /* Delete request? */
2622         head->w.is_delete = !strncmp(line, "delete ", 7);
2623         if (head->w.is_delete)
2624                 memmove(line, line + 7, strlen(line + 7) + 1);
2625         /* Selecting namespace to update. */
2626         if (head->type == TOMOYO_EXCEPTIONPOLICY ||
2627             head->type == TOMOYO_PROFILE) {
2628                 if (*line == '<') {
2629                         char *cp = strchr(line, ' ');
2630 
2631                         if (cp) {
2632                                 *cp++ = '\0';
2633                                 head->w.ns = tomoyo_assign_namespace(line);
2634                                 memmove(line, cp, strlen(cp) + 1);
2635                         } else
2636                                 head->w.ns = NULL;
2637                 } else
2638                         head->w.ns = &tomoyo_kernel_namespace;
2639                 /* Don't allow updating if namespace is invalid. */
2640                 if (!head->w.ns)
2641                         return -ENOENT;
2642         }
2643         /* Do the update. */
2644         return head->write(head);
2645 }
2646 
2647 /**
2648  * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
2649  *
2650  * @head:       Pointer to "struct tomoyo_io_buffer".
2651  * @buffer:     Pointer to buffer to read from.
2652  * @buffer_len: Size of @buffer.
2653  *
2654  * Returns @buffer_len on success, negative value otherwise.
2655  */
2656 ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
2657                              const char __user *buffer, const int buffer_len)
2658 {
2659         int error = buffer_len;
2660         size_t avail_len = buffer_len;
2661         char *cp0 = head->write_buf;
2662         int idx;
2663 
2664         if (!head->write)
2665                 return -EINVAL;
2666         if (!access_ok(buffer, buffer_len))
2667                 return -EFAULT;
2668         if (mutex_lock_interruptible(&head->io_sem))
2669                 return -EINTR;
2670         head->read_user_buf_avail = 0;
2671         idx = tomoyo_read_lock();
2672         /* Read a line and dispatch it to the policy handler. */
2673         while (avail_len > 0) {
2674                 char c;
2675 
2676                 if (head->w.avail >= head->writebuf_size - 1) {
2677                         const int len = head->writebuf_size * 2;
2678                         char *cp = kzalloc(len, GFP_NOFS);
2679 
2680                         if (!cp) {
2681                                 error = -ENOMEM;
2682                                 break;
2683                         }
2684                         memmove(cp, cp0, head->w.avail);
2685                         kfree(cp0);
2686                         head->write_buf = cp;
2687                         cp0 = cp;
2688                         head->writebuf_size = len;
2689                 }
2690                 if (get_user(c, buffer)) {
2691                         error = -EFAULT;
2692                         break;
2693                 }
2694                 buffer++;
2695                 avail_len--;
2696                 cp0[head->w.avail++] = c;
2697                 if (c != '\n')
2698                         continue;
2699                 cp0[head->w.avail - 1] = '\0';
2700                 head->w.avail = 0;
2701                 tomoyo_normalize_line(cp0);
2702                 if (!strcmp(cp0, "reset")) {
2703                         head->w.ns = &tomoyo_kernel_namespace;
2704                         head->w.domain = NULL;
2705                         memset(&head->r, 0, sizeof(head->r));
2706                         continue;
2707                 }
2708                 /* Don't allow updating policies by non manager programs. */
2709                 switch (head->type) {
2710                 case TOMOYO_PROCESS_STATUS:
2711                         /* This does not write anything. */
2712                         break;
2713                 case TOMOYO_DOMAINPOLICY:
2714                         if (tomoyo_select_domain(head, cp0))
2715                                 continue;
2716                         /* fall through */
2717                 case TOMOYO_EXCEPTIONPOLICY:
2718                         if (!strcmp(cp0, "select transition_only")) {
2719                                 head->r.print_transition_related_only = true;
2720                                 continue;
2721                         }
2722                         /* fall through */
2723                 default:
2724                         if (!tomoyo_manager()) {
2725                                 error = -EPERM;
2726                                 goto out;
2727                         }
2728                 }
2729                 switch (tomoyo_parse_policy(head, cp0)) {
2730                 case -EPERM:
2731                         error = -EPERM;
2732                         goto out;
2733                 case 0:
2734                         switch (head->type) {
2735                         case TOMOYO_DOMAINPOLICY:
2736                         case TOMOYO_EXCEPTIONPOLICY:
2737                         case TOMOYO_STAT:
2738                         case TOMOYO_PROFILE:
2739                         case TOMOYO_MANAGER:
2740                                 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
2741                                 break;
2742                         default:
2743                                 break;
2744                         }
2745                         break;
2746                 }
2747         }
2748 out:
2749         tomoyo_read_unlock(idx);
2750         mutex_unlock(&head->io_sem);
2751         return error;
2752 }
2753 
2754 /**
2755  * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2756  *
2757  * @head: Pointer to "struct tomoyo_io_buffer".
2758  */
2759 void tomoyo_close_control(struct tomoyo_io_buffer *head)
2760 {
2761         /*
2762          * If the file is /sys/kernel/security/tomoyo/query , decrement the
2763          * observer counter.
2764          */
2765         if (head->type == TOMOYO_QUERY &&
2766             atomic_dec_and_test(&tomoyo_query_observers))
2767                 wake_up_all(&tomoyo_answer_wait);
2768         tomoyo_notify_gc(head, false);
2769 }
2770 
2771 /**
2772  * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2773  */
2774 void tomoyo_check_profile(void)
2775 {
2776         struct tomoyo_domain_info *domain;
2777         const int idx = tomoyo_read_lock();
2778 
2779         tomoyo_policy_loaded = true;
2780         pr_info("TOMOYO: 2.6.0\n");
2781         list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2782                 const u8 profile = domain->profile;
2783                 struct tomoyo_policy_namespace *ns = domain->ns;
2784 
2785                 if (ns->profile_version == 20110903) {
2786                         pr_info_once("Converting profile version from %u to %u.\n",
2787                                      20110903, 20150505);
2788                         ns->profile_version = 20150505;
2789                 }
2790                 if (ns->profile_version != 20150505)
2791                         pr_err("Profile version %u is not supported.\n",
2792                                ns->profile_version);
2793                 else if (!ns->profile_ptr[profile])
2794                         pr_err("Profile %u (used by '%s') is not defined.\n",
2795                                profile, domain->domainname->name);
2796                 else
2797                         continue;
2798                 pr_err("Userland tools for TOMOYO 2.6 must be installed and policy must be initialized.\n");
2799                 pr_err("Please see https://tomoyo.osdn.jp/2.6/ for more information.\n");
2800                 panic("STOP!");
2801         }
2802         tomoyo_read_unlock(idx);
2803         pr_info("Mandatory Access Control activated.\n");
2804 }
2805 
2806 /**
2807  * tomoyo_load_builtin_policy - Load built-in policy.
2808  *
2809  * Returns nothing.
2810  */
2811 void __init tomoyo_load_builtin_policy(void)
2812 {
2813         /*
2814          * This include file is manually created and contains built-in policy
2815          * named "tomoyo_builtin_profile", "tomoyo_builtin_exception_policy",
2816          * "tomoyo_builtin_domain_policy", "tomoyo_builtin_manager",
2817          * "tomoyo_builtin_stat" in the form of "static char [] __initdata".
2818          */
2819 #include "builtin-policy.h"
2820         u8 i;
2821         const int idx = tomoyo_read_lock();
2822 
2823         for (i = 0; i < 5; i++) {
2824                 struct tomoyo_io_buffer head = { };
2825                 char *start = "";
2826 
2827                 switch (i) {
2828                 case 0:
2829                         start = tomoyo_builtin_profile;
2830                         head.type = TOMOYO_PROFILE;
2831                         head.write = tomoyo_write_profile;
2832                         break;
2833                 case 1:
2834                         start = tomoyo_builtin_exception_policy;
2835                         head.type = TOMOYO_EXCEPTIONPOLICY;
2836                         head.write = tomoyo_write_exception;
2837                         break;
2838                 case 2:
2839                         start = tomoyo_builtin_domain_policy;
2840                         head.type = TOMOYO_DOMAINPOLICY;
2841                         head.write = tomoyo_write_domain;
2842                         break;
2843                 case 3:
2844                         start = tomoyo_builtin_manager;
2845                         head.type = TOMOYO_MANAGER;
2846                         head.write = tomoyo_write_manager;
2847                         break;
2848                 case 4:
2849                         start = tomoyo_builtin_stat;
2850                         head.type = TOMOYO_STAT;
2851                         head.write = tomoyo_write_stat;
2852                         break;
2853                 }
2854                 while (1) {
2855                         char *end = strchr(start, '\n');
2856 
2857                         if (!end)
2858                                 break;
2859                         *end = '\0';
2860                         tomoyo_normalize_line(start);
2861                         head.write_buf = start;
2862                         tomoyo_parse_policy(&head, start);
2863                         start = end + 1;
2864                 }
2865         }
2866         tomoyo_read_unlock(idx);
2867 #ifdef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
2868         tomoyo_check_profile();
2869 #endif
2870 }
2871 

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