root/security/smack/smackfs.c

DEFINITIONS

1. smack_catset_bit
2. smk_netlabel_audit_set
3. smk_set_access
4. smk_perm_from_str
5. smk_fill_rule
6. smk_parse_rule
7. smk_parse_long_rule
8. smk_write_rules_list
9. smk_seq_start
10. smk_seq_next
11. smk_seq_stop
12. smk_rule_show
13. load2_seq_start
14. load2_seq_next
15. load_seq_show
16. smk_open_load
17. smk_write_load
18. smk_cipso_doi
19. smk_unlbl_ambient
20. cipso_seq_start
21. cipso_seq_next
22. cipso_seq_show
23. smk_open_cipso
24. smk_set_cipso
25. smk_write_cipso
26. cipso2_seq_show
27. smk_open_cipso2
28. smk_write_cipso2
29. net4addr_seq_start
30. net4addr_seq_next
31. net4addr_seq_show
32. smk_open_net4addr
33. smk_net4addr_insert
34. smk_write_net4addr
35. net6addr_seq_start
36. net6addr_seq_next
37. net6addr_seq_show
38. smk_open_net6addr
39. smk_net6addr_insert
40. smk_write_net6addr
41. smk_read_doi
42. smk_write_doi
43. smk_read_direct
44. smk_write_direct
45. smk_read_mapped
46. smk_write_mapped
47. smk_read_ambient
48. smk_write_ambient
49. onlycap_seq_start
50. onlycap_seq_next
51. onlycap_seq_show
52. smk_open_onlycap
53. smk_list_swap_rcu
54. smk_parse_label_list
55. smk_destroy_label_list
56. smk_write_onlycap
57. smk_read_unconfined
58. smk_write_unconfined
59. smk_read_logging
60. smk_write_logging
61. load_self_seq_start
62. load_self_seq_next
63. load_self_seq_show
64. smk_open_load_self
65. smk_write_load_self
66. smk_user_access
67. smk_write_access
68. load2_seq_show
69. smk_open_load2
70. smk_write_load2
71. load_self2_seq_start
72. load_self2_seq_next
73. load_self2_seq_show
74. smk_open_load_self2
75. smk_write_load_self2
76. smk_write_access2
77. smk_write_revoke_subj
78. smk_init_sysfs
79. smk_write_change_rule
80. smk_read_syslog
81. smk_write_syslog
82. relabel_self_seq_start
83. relabel_self_seq_next
84. relabel_self_seq_show
85. smk_open_relabel_self
86. smk_write_relabel_self
87. smk_read_ptrace
88. smk_write_ptrace
89. smk_fill_super
90. smk_get_tree
91. smk_init_fs_context
92. smk_preset_netlabel
93. init_smk_fs

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
   4  *
   5  * Authors:
   6  *      Casey Schaufler <casey@schaufler-ca.com>
   7  *      Ahmed S. Darwish <darwish.07@gmail.com>
   8  *
   9  * Special thanks to the authors of selinuxfs.
  10  *
  11  *      Karl MacMillan <kmacmillan@tresys.com>
  12  *      James Morris <jmorris@redhat.com>
  13  */
  14 
  15 #include <linux/kernel.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/security.h>
  18 #include <linux/mutex.h>
  19 #include <linux/slab.h>
  20 #include <net/net_namespace.h>
  21 #include <net/cipso_ipv4.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/ctype.h>
  24 #include <linux/audit.h>
  25 #include <linux/magic.h>
  26 #include <linux/fs_context.h>
  27 #include "smack.h"
  28 
  29 #define BEBITS  (sizeof(__be32) * 8)
  30 /*
  31  * smackfs pseudo filesystem.
  32  */
  33 
  34 enum smk_inos {
  35         SMK_ROOT_INO    = 2,
  36         SMK_LOAD        = 3,    /* load policy */
  37         SMK_CIPSO       = 4,    /* load label -> CIPSO mapping */
  38         SMK_DOI         = 5,    /* CIPSO DOI */
  39         SMK_DIRECT      = 6,    /* CIPSO level indicating direct label */
  40         SMK_AMBIENT     = 7,    /* internet ambient label */
  41         SMK_NET4ADDR    = 8,    /* single label hosts */
  42         SMK_ONLYCAP     = 9,    /* the only "capable" label */
  43         SMK_LOGGING     = 10,   /* logging */
  44         SMK_LOAD_SELF   = 11,   /* task specific rules */
  45         SMK_ACCESSES    = 12,   /* access policy */
  46         SMK_MAPPED      = 13,   /* CIPSO level indicating mapped label */
  47         SMK_LOAD2       = 14,   /* load policy with long labels */
  48         SMK_LOAD_SELF2  = 15,   /* load task specific rules with long labels */
  49         SMK_ACCESS2     = 16,   /* make an access check with long labels */
  50         SMK_CIPSO2      = 17,   /* load long label -> CIPSO mapping */
  51         SMK_REVOKE_SUBJ = 18,   /* set rules with subject label to '-' */
  52         SMK_CHANGE_RULE = 19,   /* change or add rules (long labels) */
  53         SMK_SYSLOG      = 20,   /* change syslog label) */
  54         SMK_PTRACE      = 21,   /* set ptrace rule */
  55 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
  56         SMK_UNCONFINED  = 22,   /* define an unconfined label */
  57 #endif
  58 #if IS_ENABLED(CONFIG_IPV6)
  59         SMK_NET6ADDR    = 23,   /* single label IPv6 hosts */
  60 #endif /* CONFIG_IPV6 */
  61         SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
  62 };
  63 
  64 /*
  65  * List locks
  66  */
  67 static DEFINE_MUTEX(smack_cipso_lock);
  68 static DEFINE_MUTEX(smack_ambient_lock);
  69 static DEFINE_MUTEX(smk_net4addr_lock);
  70 #if IS_ENABLED(CONFIG_IPV6)
  71 static DEFINE_MUTEX(smk_net6addr_lock);
  72 #endif /* CONFIG_IPV6 */
  73 
  74 /*
  75  * This is the "ambient" label for network traffic.
  76  * If it isn't somehow marked, use this.
  77  * It can be reset via smackfs/ambient
  78  */
  79 struct smack_known *smack_net_ambient;
  80 
  81 /*
  82  * This is the level in a CIPSO header that indicates a
  83  * smack label is contained directly in the category set.
  84  * It can be reset via smackfs/direct
  85  */
  86 int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
  87 
  88 /*
  89  * This is the level in a CIPSO header that indicates a
  90  * secid is contained directly in the category set.
  91  * It can be reset via smackfs/mapped
  92  */
  93 int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
  94 
  95 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
  96 /*
  97  * Allow one label to be unconfined. This is for
  98  * debugging and application bring-up purposes only.
  99  * It is bad and wrong, but everyone seems to expect
 100  * to have it.
 101  */
 102 struct smack_known *smack_unconfined;
 103 #endif
 104 
 105 /*
 106  * If this value is set restrict syslog use to the label specified.
 107  * It can be reset via smackfs/syslog
 108  */
 109 struct smack_known *smack_syslog_label;
 110 
 111 /*
 112  * Ptrace current rule
 113  * SMACK_PTRACE_DEFAULT    regular smack ptrace rules (/proc based)
 114  * SMACK_PTRACE_EXACT      labels must match, but can be overriden with
 115  *                         CAP_SYS_PTRACE
 116  * SMACK_PTRACE_DRACONIAN  lables must match, CAP_SYS_PTRACE has no effect
 117  */
 118 int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
 119 
 120 /*
 121  * Certain IP addresses may be designated as single label hosts.
 122  * Packets are sent there unlabeled, but only from tasks that
 123  * can write to the specified label.
 124  */
 125 
 126 LIST_HEAD(smk_net4addr_list);
 127 #if IS_ENABLED(CONFIG_IPV6)
 128 LIST_HEAD(smk_net6addr_list);
 129 #endif /* CONFIG_IPV6 */
 130 
 131 /*
 132  * Rule lists are maintained for each label.
 133  */
 134 struct smack_parsed_rule {
 135         struct smack_known      *smk_subject;
 136         struct smack_known      *smk_object;
 137         int                     smk_access1;
 138         int                     smk_access2;
 139 };
 140 
 141 static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
 142 
 143 /*
 144  * Values for parsing cipso rules
 145  * SMK_DIGITLEN: Length of a digit field in a rule.
 146  * SMK_CIPSOMIN: Minimum possible cipso rule length.
 147  * SMK_CIPSOMAX: Maximum possible cipso rule length.
 148  */
 149 #define SMK_DIGITLEN 4
 150 #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
 151 #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
 152 
 153 /*
 154  * Values for parsing MAC rules
 155  * SMK_ACCESS: Maximum possible combination of access permissions
 156  * SMK_ACCESSLEN: Maximum length for a rule access field
 157  * SMK_LOADLEN: Smack rule length
 158  */
 159 #define SMK_OACCESS     "rwxa"
 160 #define SMK_ACCESS      "rwxatl"
 161 #define SMK_OACCESSLEN  (sizeof(SMK_OACCESS) - 1)
 162 #define SMK_ACCESSLEN   (sizeof(SMK_ACCESS) - 1)
 163 #define SMK_OLOADLEN    (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
 164 #define SMK_LOADLEN     (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
 165 
 166 /*
 167  * Stricly for CIPSO level manipulation.
 168  * Set the category bit number in a smack label sized buffer.
 169  */
 170 static inline void smack_catset_bit(unsigned int cat, char *catsetp)
 171 {
 172         if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
 173                 return;
 174 
 175         catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
 176 }
 177 
 178 /**
 179  * smk_netlabel_audit_set - fill a netlbl_audit struct
 180  * @nap: structure to fill
 181  */
 182 static void smk_netlabel_audit_set(struct netlbl_audit *nap)
 183 {
 184         struct smack_known *skp = smk_of_current();
 185 
 186         nap->loginuid = audit_get_loginuid(current);
 187         nap->sessionid = audit_get_sessionid(current);
 188         nap->secid = skp->smk_secid;
 189 }
 190 
 191 /*
 192  * Value for parsing single label host rules
 193  * "1.2.3.4 X"
 194  */
 195 #define SMK_NETLBLADDRMIN       9
 196 
 197 /**
 198  * smk_set_access - add a rule to the rule list or replace an old rule
 199  * @srp: the rule to add or replace
 200  * @rule_list: the list of rules
 201  * @rule_lock: the rule list lock
 202  *
 203  * Looks through the current subject/object/access list for
 204  * the subject/object pair and replaces the access that was
 205  * there. If the pair isn't found add it with the specified
 206  * access.
 207  *
 208  * Returns 0 if nothing goes wrong or -ENOMEM if it fails
 209  * during the allocation of the new pair to add.
 210  */
 211 static int smk_set_access(struct smack_parsed_rule *srp,
 212                                 struct list_head *rule_list,
 213                                 struct mutex *rule_lock)
 214 {
 215         struct smack_rule *sp;
 216         int found = 0;
 217         int rc = 0;
 218 
 219         mutex_lock(rule_lock);
 220 
 221         /*
 222          * Because the object label is less likely to match
 223          * than the subject label check it first
 224          */
 225         list_for_each_entry_rcu(sp, rule_list, list) {
 226                 if (sp->smk_object == srp->smk_object &&
 227                     sp->smk_subject == srp->smk_subject) {
 228                         found = 1;
 229                         sp->smk_access |= srp->smk_access1;
 230                         sp->smk_access &= ~srp->smk_access2;
 231                         break;
 232                 }
 233         }
 234 
 235         if (found == 0) {
 236                 sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
 237                 if (sp == NULL) {
 238                         rc = -ENOMEM;
 239                         goto out;
 240                 }
 241 
 242                 sp->smk_subject = srp->smk_subject;
 243                 sp->smk_object = srp->smk_object;
 244                 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
 245 
 246                 list_add_rcu(&sp->list, rule_list);
 247         }
 248 
 249 out:
 250         mutex_unlock(rule_lock);
 251         return rc;
 252 }
 253 
 254 /**
 255  * smk_perm_from_str - parse smack accesses from a text string
 256  * @string: a text string that contains a Smack accesses code
 257  *
 258  * Returns an integer with respective bits set for specified accesses.
 259  */
 260 static int smk_perm_from_str(const char *string)
 261 {
 262         int perm = 0;
 263         const char *cp;
 264 
 265         for (cp = string; ; cp++)
 266                 switch (*cp) {
 267                 case '-':
 268                         break;
 269                 case 'r':
 270                 case 'R':
 271                         perm |= MAY_READ;
 272                         break;
 273                 case 'w':
 274                 case 'W':
 275                         perm |= MAY_WRITE;
 276                         break;
 277                 case 'x':
 278                 case 'X':
 279                         perm |= MAY_EXEC;
 280                         break;
 281                 case 'a':
 282                 case 'A':
 283                         perm |= MAY_APPEND;
 284                         break;
 285                 case 't':
 286                 case 'T':
 287                         perm |= MAY_TRANSMUTE;
 288                         break;
 289                 case 'l':
 290                 case 'L':
 291                         perm |= MAY_LOCK;
 292                         break;
 293                 case 'b':
 294                 case 'B':
 295                         perm |= MAY_BRINGUP;
 296                         break;
 297                 default:
 298                         return perm;
 299                 }
 300 }
 301 
 302 /**
 303  * smk_fill_rule - Fill Smack rule from strings
 304  * @subject: subject label string
 305  * @object: object label string
 306  * @access1: access string
 307  * @access2: string with permissions to be removed
 308  * @rule: Smack rule
 309  * @import: if non-zero, import labels
 310  * @len: label length limit
 311  *
 312  * Returns 0 on success, appropriate error code on failure.
 313  */
 314 static int smk_fill_rule(const char *subject, const char *object,
 315                                 const char *access1, const char *access2,
 316                                 struct smack_parsed_rule *rule, int import,
 317                                 int len)
 318 {
 319         const char *cp;
 320         struct smack_known *skp;
 321 
 322         if (import) {
 323                 rule->smk_subject = smk_import_entry(subject, len);
 324                 if (IS_ERR(rule->smk_subject))
 325                         return PTR_ERR(rule->smk_subject);
 326 
 327                 rule->smk_object = smk_import_entry(object, len);
 328                 if (IS_ERR(rule->smk_object))
 329                         return PTR_ERR(rule->smk_object);
 330         } else {
 331                 cp = smk_parse_smack(subject, len);
 332                 if (IS_ERR(cp))
 333                         return PTR_ERR(cp);
 334                 skp = smk_find_entry(cp);
 335                 kfree(cp);
 336                 if (skp == NULL)
 337                         return -ENOENT;
 338                 rule->smk_subject = skp;
 339 
 340                 cp = smk_parse_smack(object, len);
 341                 if (IS_ERR(cp))
 342                         return PTR_ERR(cp);
 343                 skp = smk_find_entry(cp);
 344                 kfree(cp);
 345                 if (skp == NULL)
 346                         return -ENOENT;
 347                 rule->smk_object = skp;
 348         }
 349 
 350         rule->smk_access1 = smk_perm_from_str(access1);
 351         if (access2)
 352                 rule->smk_access2 = smk_perm_from_str(access2);
 353         else
 354                 rule->smk_access2 = ~rule->smk_access1;
 355 
 356         return 0;
 357 }
 358 
 359 /**
 360  * smk_parse_rule - parse Smack rule from load string
 361  * @data: string to be parsed whose size is SMK_LOADLEN
 362  * @rule: Smack rule
 363  * @import: if non-zero, import labels
 364  *
 365  * Returns 0 on success, -1 on errors.
 366  */
 367 static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
 368                                 int import)
 369 {
 370         int rc;
 371 
 372         rc = smk_fill_rule(data, data + SMK_LABELLEN,
 373                            data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
 374                            import, SMK_LABELLEN);
 375         return rc;
 376 }
 377 
 378 /**
 379  * smk_parse_long_rule - parse Smack rule from rule string
 380  * @data: string to be parsed, null terminated
 381  * @rule: Will be filled with Smack parsed rule
 382  * @import: if non-zero, import labels
 383  * @tokens: numer of substrings expected in data
 384  *
 385  * Returns number of processed bytes on success, -ERRNO on failure.
 386  */
 387 static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
 388                                 int import, int tokens)
 389 {
 390         ssize_t cnt = 0;
 391         char *tok[4];
 392         int rc;
 393         int i;
 394 
 395         /*
 396          * Parsing the rule in-place, filling all white-spaces with '\0'
 397          */
 398         for (i = 0; i < tokens; ++i) {
 399                 while (isspace(data[cnt]))
 400                         data[cnt++] = '\0';
 401 
 402                 if (data[cnt] == '\0')
 403                         /* Unexpected end of data */
 404                         return -EINVAL;
 405 
 406                 tok[i] = data + cnt;
 407 
 408                 while (data[cnt] && !isspace(data[cnt]))
 409                         ++cnt;
 410         }
 411         while (isspace(data[cnt]))
 412                 data[cnt++] = '\0';
 413 
 414         while (i < 4)
 415                 tok[i++] = NULL;
 416 
 417         rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
 418         return rc == 0 ? cnt : rc;
 419 }
 420 
 421 #define SMK_FIXED24_FMT 0       /* Fixed 24byte label format */
 422 #define SMK_LONG_FMT    1       /* Variable long label format */
 423 #define SMK_CHANGE_FMT  2       /* Rule modification format */
 424 /**
 425  * smk_write_rules_list - write() for any /smack rule file
 426  * @file: file pointer, not actually used
 427  * @buf: where to get the data from
 428  * @count: bytes sent
 429  * @ppos: where to start - must be 0
 430  * @rule_list: the list of rules to write to
 431  * @rule_lock: lock for the rule list
 432  * @format: /smack/load or /smack/load2 or /smack/change-rule format.
 433  *
 434  * Get one smack access rule from above.
 435  * The format for SMK_LONG_FMT is:
 436  *      "subject<whitespace>object<whitespace>access[<whitespace>...]"
 437  * The format for SMK_FIXED24_FMT is exactly:
 438  *      "subject                 object                  rwxat"
 439  * The format for SMK_CHANGE_FMT is:
 440  *      "subject<whitespace>object<whitespace>
 441  *       acc_enable<whitespace>acc_disable[<whitespace>...]"
 442  */
 443 static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
 444                                         size_t count, loff_t *ppos,
 445                                         struct list_head *rule_list,
 446                                         struct mutex *rule_lock, int format)
 447 {
 448         struct smack_parsed_rule rule;
 449         char *data;
 450         int rc;
 451         int trunc = 0;
 452         int tokens;
 453         ssize_t cnt = 0;
 454 
 455         /*
 456          * No partial writes.
 457          * Enough data must be present.
 458          */
 459         if (*ppos != 0)
 460                 return -EINVAL;
 461 
 462         if (format == SMK_FIXED24_FMT) {
 463                 /*
 464                  * Minor hack for backward compatibility
 465                  */
 466                 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
 467                         return -EINVAL;
 468         } else {
 469                 if (count >= PAGE_SIZE) {
 470                         count = PAGE_SIZE - 1;
 471                         trunc = 1;
 472                 }
 473         }
 474 
 475         data = memdup_user_nul(buf, count);
 476         if (IS_ERR(data))
 477                 return PTR_ERR(data);
 478 
 479         /*
 480          * In case of parsing only part of user buf,
 481          * avoid having partial rule at the data buffer
 482          */
 483         if (trunc) {
 484                 while (count > 0 && (data[count - 1] != '\n'))
 485                         --count;
 486                 if (count == 0) {
 487                         rc = -EINVAL;
 488                         goto out;
 489                 }
 490         }
 491 
 492         data[count] = '\0';
 493         tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
 494         while (cnt < count) {
 495                 if (format == SMK_FIXED24_FMT) {
 496                         rc = smk_parse_rule(data, &rule, 1);
 497                         if (rc < 0)
 498                                 goto out;
 499                         cnt = count;
 500                 } else {
 501                         rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
 502                         if (rc < 0)
 503                                 goto out;
 504                         if (rc == 0) {
 505                                 rc = -EINVAL;
 506                                 goto out;
 507                         }
 508                         cnt += rc;
 509                 }
 510 
 511                 if (rule_list == NULL)
 512                         rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
 513                                 &rule.smk_subject->smk_rules_lock);
 514                 else
 515                         rc = smk_set_access(&rule, rule_list, rule_lock);
 516 
 517                 if (rc)
 518                         goto out;
 519         }
 520 
 521         rc = cnt;
 522 out:
 523         kfree(data);
 524         return rc;
 525 }
 526 
 527 /*
 528  * Core logic for smackfs seq list operations.
 529  */
 530 
 531 static void *smk_seq_start(struct seq_file *s, loff_t *pos,
 532                                 struct list_head *head)
 533 {
 534         struct list_head *list;
 535         int i = *pos;
 536 
 537         rcu_read_lock();
 538         for (list = rcu_dereference(list_next_rcu(head));
 539                 list != head;
 540                 list = rcu_dereference(list_next_rcu(list))) {
 541                 if (i-- == 0)
 542                         return list;
 543         }
 544 
 545         return NULL;
 546 }
 547 
 548 static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
 549                                 struct list_head *head)
 550 {
 551         struct list_head *list = v;
 552 
 553         ++*pos;
 554         list = rcu_dereference(list_next_rcu(list));
 555 
 556         return (list == head) ? NULL : list;
 557 }
 558 
 559 static void smk_seq_stop(struct seq_file *s, void *v)
 560 {
 561         rcu_read_unlock();
 562 }
 563 
 564 static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
 565 {
 566         /*
 567          * Don't show any rules with label names too long for
 568          * interface file (/smack/load or /smack/load2)
 569          * because you should expect to be able to write
 570          * anything you read back.
 571          */
 572         if (strlen(srp->smk_subject->smk_known) >= max ||
 573             strlen(srp->smk_object->smk_known) >= max)
 574                 return;
 575 
 576         if (srp->smk_access == 0)
 577                 return;
 578 
 579         seq_printf(s, "%s %s",
 580                    srp->smk_subject->smk_known,
 581                    srp->smk_object->smk_known);
 582 
 583         seq_putc(s, ' ');
 584 
 585         if (srp->smk_access & MAY_READ)
 586                 seq_putc(s, 'r');
 587         if (srp->smk_access & MAY_WRITE)
 588                 seq_putc(s, 'w');
 589         if (srp->smk_access & MAY_EXEC)
 590                 seq_putc(s, 'x');
 591         if (srp->smk_access & MAY_APPEND)
 592                 seq_putc(s, 'a');
 593         if (srp->smk_access & MAY_TRANSMUTE)
 594                 seq_putc(s, 't');
 595         if (srp->smk_access & MAY_LOCK)
 596                 seq_putc(s, 'l');
 597         if (srp->smk_access & MAY_BRINGUP)
 598                 seq_putc(s, 'b');
 599 
 600         seq_putc(s, '\n');
 601 }
 602 
 603 /*
 604  * Seq_file read operations for /smack/load
 605  */
 606 
 607 static void *load2_seq_start(struct seq_file *s, loff_t *pos)
 608 {
 609         return smk_seq_start(s, pos, &smack_known_list);
 610 }
 611 
 612 static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
 613 {
 614         return smk_seq_next(s, v, pos, &smack_known_list);
 615 }
 616 
 617 static int load_seq_show(struct seq_file *s, void *v)
 618 {
 619         struct list_head *list = v;
 620         struct smack_rule *srp;
 621         struct smack_known *skp =
 622                 list_entry_rcu(list, struct smack_known, list);
 623 
 624         list_for_each_entry_rcu(srp, &skp->smk_rules, list)
 625                 smk_rule_show(s, srp, SMK_LABELLEN);
 626 
 627         return 0;
 628 }
 629 
 630 static const struct seq_operations load_seq_ops = {
 631         .start = load2_seq_start,
 632         .next  = load2_seq_next,
 633         .show  = load_seq_show,
 634         .stop  = smk_seq_stop,
 635 };
 636 
 637 /**
 638  * smk_open_load - open() for /smack/load
 639  * @inode: inode structure representing file
 640  * @file: "load" file pointer
 641  *
 642  * For reading, use load_seq_* seq_file reading operations.
 643  */
 644 static int smk_open_load(struct inode *inode, struct file *file)
 645 {
 646         return seq_open(file, &load_seq_ops);
 647 }
 648 
 649 /**
 650  * smk_write_load - write() for /smack/load
 651  * @file: file pointer, not actually used
 652  * @buf: where to get the data from
 653  * @count: bytes sent
 654  * @ppos: where to start - must be 0
 655  *
 656  */
 657 static ssize_t smk_write_load(struct file *file, const char __user *buf,
 658                               size_t count, loff_t *ppos)
 659 {
 660         /*
 661          * Must have privilege.
 662          * No partial writes.
 663          * Enough data must be present.
 664          */
 665         if (!smack_privileged(CAP_MAC_ADMIN))
 666                 return -EPERM;
 667 
 668         return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
 669                                     SMK_FIXED24_FMT);
 670 }
 671 
 672 static const struct file_operations smk_load_ops = {
 673         .open           = smk_open_load,
 674         .read           = seq_read,
 675         .llseek         = seq_lseek,
 676         .write          = smk_write_load,
 677         .release        = seq_release,
 678 };
 679 
 680 /**
 681  * smk_cipso_doi - initialize the CIPSO domain
 682  */
 683 static void smk_cipso_doi(void)
 684 {
 685         int rc;
 686         struct cipso_v4_doi *doip;
 687         struct netlbl_audit nai;
 688 
 689         smk_netlabel_audit_set(&nai);
 690 
 691         rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
 692         if (rc != 0)
 693                 printk(KERN_WARNING "%s:%d remove rc = %d\n",
 694                        __func__, __LINE__, rc);
 695 
 696         doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
 697         if (doip == NULL)
 698                 panic("smack:  Failed to initialize cipso DOI.\n");
 699         doip->map.std = NULL;
 700         doip->doi = smk_cipso_doi_value;
 701         doip->type = CIPSO_V4_MAP_PASS;
 702         doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
 703         for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
 704                 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
 705 
 706         rc = netlbl_cfg_cipsov4_add(doip, &nai);
 707         if (rc != 0) {
 708                 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
 709                        __func__, __LINE__, rc);
 710                 kfree(doip);
 711                 return;
 712         }
 713         rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
 714         if (rc != 0) {
 715                 printk(KERN_WARNING "%s:%d map add rc = %d\n",
 716                        __func__, __LINE__, rc);
 717                 kfree(doip);
 718                 return;
 719         }
 720 }
 721 
 722 /**
 723  * smk_unlbl_ambient - initialize the unlabeled domain
 724  * @oldambient: previous domain string
 725  */
 726 static void smk_unlbl_ambient(char *oldambient)
 727 {
 728         int rc;
 729         struct netlbl_audit nai;
 730 
 731         smk_netlabel_audit_set(&nai);
 732 
 733         if (oldambient != NULL) {
 734                 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
 735                 if (rc != 0)
 736                         printk(KERN_WARNING "%s:%d remove rc = %d\n",
 737                                __func__, __LINE__, rc);
 738         }
 739         if (smack_net_ambient == NULL)
 740                 smack_net_ambient = &smack_known_floor;
 741 
 742         rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
 743                                       NULL, NULL, &nai);
 744         if (rc != 0)
 745                 printk(KERN_WARNING "%s:%d add rc = %d\n",
 746                        __func__, __LINE__, rc);
 747 }
 748 
 749 /*
 750  * Seq_file read operations for /smack/cipso
 751  */
 752 
 753 static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
 754 {
 755         return smk_seq_start(s, pos, &smack_known_list);
 756 }
 757 
 758 static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
 759 {
 760         return smk_seq_next(s, v, pos, &smack_known_list);
 761 }
 762 
 763 /*
 764  * Print cipso labels in format:
 765  * label level[/cat[,cat]]
 766  */
 767 static int cipso_seq_show(struct seq_file *s, void *v)
 768 {
 769         struct list_head  *list = v;
 770         struct smack_known *skp =
 771                 list_entry_rcu(list, struct smack_known, list);
 772         struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
 773         char sep = '/';
 774         int i;
 775 
 776         /*
 777          * Don't show a label that could not have been set using
 778          * /smack/cipso. This is in support of the notion that
 779          * anything read from /smack/cipso ought to be writeable
 780          * to /smack/cipso.
 781          *
 782          * /smack/cipso2 should be used instead.
 783          */
 784         if (strlen(skp->smk_known) >= SMK_LABELLEN)
 785                 return 0;
 786 
 787         seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
 788 
 789         for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
 790              i = netlbl_catmap_walk(cmp, i + 1)) {
 791                 seq_printf(s, "%c%d", sep, i);
 792                 sep = ',';
 793         }
 794 
 795         seq_putc(s, '\n');
 796 
 797         return 0;
 798 }
 799 
 800 static const struct seq_operations cipso_seq_ops = {
 801         .start = cipso_seq_start,
 802         .next  = cipso_seq_next,
 803         .show  = cipso_seq_show,
 804         .stop  = smk_seq_stop,
 805 };
 806 
 807 /**
 808  * smk_open_cipso - open() for /smack/cipso
 809  * @inode: inode structure representing file
 810  * @file: "cipso" file pointer
 811  *
 812  * Connect our cipso_seq_* operations with /smack/cipso
 813  * file_operations
 814  */
 815 static int smk_open_cipso(struct inode *inode, struct file *file)
 816 {
 817         return seq_open(file, &cipso_seq_ops);
 818 }
 819 
 820 /**
 821  * smk_set_cipso - do the work for write() for cipso and cipso2
 822  * @file: file pointer, not actually used
 823  * @buf: where to get the data from
 824  * @count: bytes sent
 825  * @ppos: where to start
 826  * @format: /smack/cipso or /smack/cipso2
 827  *
 828  * Accepts only one cipso rule per write call.
 829  * Returns number of bytes written or error code, as appropriate
 830  */
 831 static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
 832                                 size_t count, loff_t *ppos, int format)
 833 {
 834         struct smack_known *skp;
 835         struct netlbl_lsm_secattr ncats;
 836         char mapcatset[SMK_CIPSOLEN];
 837         int maplevel;
 838         unsigned int cat;
 839         int catlen;
 840         ssize_t rc = -EINVAL;
 841         char *data = NULL;
 842         char *rule;
 843         int ret;
 844         int i;
 845 
 846         /*
 847          * Must have privilege.
 848          * No partial writes.
 849          * Enough data must be present.
 850          */
 851         if (!smack_privileged(CAP_MAC_ADMIN))
 852                 return -EPERM;
 853         if (*ppos != 0)
 854                 return -EINVAL;
 855         if (format == SMK_FIXED24_FMT &&
 856             (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
 857                 return -EINVAL;
 858 
 859         data = memdup_user_nul(buf, count);
 860         if (IS_ERR(data))
 861                 return PTR_ERR(data);
 862 
 863         rule = data;
 864         /*
 865          * Only allow one writer at a time. Writes should be
 866          * quite rare and small in any case.
 867          */
 868         mutex_lock(&smack_cipso_lock);
 869 
 870         skp = smk_import_entry(rule, 0);
 871         if (IS_ERR(skp)) {
 872                 rc = PTR_ERR(skp);
 873                 goto out;
 874         }
 875 
 876         if (format == SMK_FIXED24_FMT)
 877                 rule += SMK_LABELLEN;
 878         else
 879                 rule += strlen(skp->smk_known) + 1;
 880 
 881         if (rule > data + count) {
 882                 rc = -EOVERFLOW;
 883                 goto out;
 884         }
 885 
 886         ret = sscanf(rule, "%d", &maplevel);
 887         if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
 888                 goto out;
 889 
 890         rule += SMK_DIGITLEN;
 891         if (rule > data + count) {
 892                 rc = -EOVERFLOW;
 893                 goto out;
 894         }
 895 
 896         ret = sscanf(rule, "%d", &catlen);
 897         if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
 898                 goto out;
 899 
 900         if (format == SMK_FIXED24_FMT &&
 901             count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
 902                 goto out;
 903 
 904         memset(mapcatset, 0, sizeof(mapcatset));
 905 
 906         for (i = 0; i < catlen; i++) {
 907                 rule += SMK_DIGITLEN;
 908                 ret = sscanf(rule, "%u", &cat);
 909                 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
 910                         goto out;
 911 
 912                 smack_catset_bit(cat, mapcatset);
 913         }
 914 
 915         rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
 916         if (rc >= 0) {
 917                 netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
 918                 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
 919                 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
 920                 rc = count;
 921         }
 922 
 923 out:
 924         mutex_unlock(&smack_cipso_lock);
 925         kfree(data);
 926         return rc;
 927 }
 928 
 929 /**
 930  * smk_write_cipso - write() for /smack/cipso
 931  * @file: file pointer, not actually used
 932  * @buf: where to get the data from
 933  * @count: bytes sent
 934  * @ppos: where to start
 935  *
 936  * Accepts only one cipso rule per write call.
 937  * Returns number of bytes written or error code, as appropriate
 938  */
 939 static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
 940                                size_t count, loff_t *ppos)
 941 {
 942         return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
 943 }
 944 
 945 static const struct file_operations smk_cipso_ops = {
 946         .open           = smk_open_cipso,
 947         .read           = seq_read,
 948         .llseek         = seq_lseek,
 949         .write          = smk_write_cipso,
 950         .release        = seq_release,
 951 };
 952 
 953 /*
 954  * Seq_file read operations for /smack/cipso2
 955  */
 956 
 957 /*
 958  * Print cipso labels in format:
 959  * label level[/cat[,cat]]
 960  */
 961 static int cipso2_seq_show(struct seq_file *s, void *v)
 962 {
 963         struct list_head  *list = v;
 964         struct smack_known *skp =
 965                 list_entry_rcu(list, struct smack_known, list);
 966         struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
 967         char sep = '/';
 968         int i;
 969 
 970         seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
 971 
 972         for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
 973              i = netlbl_catmap_walk(cmp, i + 1)) {
 974                 seq_printf(s, "%c%d", sep, i);
 975                 sep = ',';
 976         }
 977 
 978         seq_putc(s, '\n');
 979 
 980         return 0;
 981 }
 982 
 983 static const struct seq_operations cipso2_seq_ops = {
 984         .start = cipso_seq_start,
 985         .next  = cipso_seq_next,
 986         .show  = cipso2_seq_show,
 987         .stop  = smk_seq_stop,
 988 };
 989 
 990 /**
 991  * smk_open_cipso2 - open() for /smack/cipso2
 992  * @inode: inode structure representing file
 993  * @file: "cipso2" file pointer
 994  *
 995  * Connect our cipso_seq_* operations with /smack/cipso2
 996  * file_operations
 997  */
 998 static int smk_open_cipso2(struct inode *inode, struct file *file)
 999 {
1000         return seq_open(file, &cipso2_seq_ops);
1001 }
1002 
1003 /**
1004  * smk_write_cipso2 - write() for /smack/cipso2
1005  * @file: file pointer, not actually used
1006  * @buf: where to get the data from
1007  * @count: bytes sent
1008  * @ppos: where to start
1009  *
1010  * Accepts only one cipso rule per write call.
1011  * Returns number of bytes written or error code, as appropriate
1012  */
1013 static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1014                               size_t count, loff_t *ppos)
1015 {
1016         return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1017 }
1018 
1019 static const struct file_operations smk_cipso2_ops = {
1020         .open           = smk_open_cipso2,
1021         .read           = seq_read,
1022         .llseek         = seq_lseek,
1023         .write          = smk_write_cipso2,
1024         .release        = seq_release,
1025 };
1026 
1027 /*
1028  * Seq_file read operations for /smack/netlabel
1029  */
1030 
1031 static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1032 {
1033         return smk_seq_start(s, pos, &smk_net4addr_list);
1034 }
1035 
1036 static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1037 {
1038         return smk_seq_next(s, v, pos, &smk_net4addr_list);
1039 }
1040 
1041 /*
1042  * Print host/label pairs
1043  */
1044 static int net4addr_seq_show(struct seq_file *s, void *v)
1045 {
1046         struct list_head *list = v;
1047         struct smk_net4addr *skp =
1048                         list_entry_rcu(list, struct smk_net4addr, list);
1049         char *kp = SMACK_CIPSO_OPTION;
1050 
1051         if (skp->smk_label != NULL)
1052                 kp = skp->smk_label->smk_known;
1053         seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1054                         skp->smk_masks, kp);
1055 
1056         return 0;
1057 }
1058 
1059 static const struct seq_operations net4addr_seq_ops = {
1060         .start = net4addr_seq_start,
1061         .next  = net4addr_seq_next,
1062         .show  = net4addr_seq_show,
1063         .stop  = smk_seq_stop,
1064 };
1065 
1066 /**
1067  * smk_open_net4addr - open() for /smack/netlabel
1068  * @inode: inode structure representing file
1069  * @file: "netlabel" file pointer
1070  *
1071  * Connect our net4addr_seq_* operations with /smack/netlabel
1072  * file_operations
1073  */
1074 static int smk_open_net4addr(struct inode *inode, struct file *file)
1075 {
1076         return seq_open(file, &net4addr_seq_ops);
1077 }
1078 
1079 /**
1080  * smk_net4addr_insert
1081  * @new : netlabel to insert
1082  *
1083  * This helper insert netlabel in the smack_net4addrs list
1084  * sorted by netmask length (longest to smallest)
1085  * locked by &smk_net4addr_lock in smk_write_net4addr
1086  *
1087  */
1088 static void smk_net4addr_insert(struct smk_net4addr *new)
1089 {
1090         struct smk_net4addr *m;
1091         struct smk_net4addr *m_next;
1092 
1093         if (list_empty(&smk_net4addr_list)) {
1094                 list_add_rcu(&new->list, &smk_net4addr_list);
1095                 return;
1096         }
1097 
1098         m = list_entry_rcu(smk_net4addr_list.next,
1099                            struct smk_net4addr, list);
1100 
1101         /* the comparison '>' is a bit hacky, but works */
1102         if (new->smk_masks > m->smk_masks) {
1103                 list_add_rcu(&new->list, &smk_net4addr_list);
1104                 return;
1105         }
1106 
1107         list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1108                 if (list_is_last(&m->list, &smk_net4addr_list)) {
1109                         list_add_rcu(&new->list, &m->list);
1110                         return;
1111                 }
1112                 m_next = list_entry_rcu(m->list.next,
1113                                         struct smk_net4addr, list);
1114                 if (new->smk_masks > m_next->smk_masks) {
1115                         list_add_rcu(&new->list, &m->list);
1116                         return;
1117                 }
1118         }
1119 }
1120 
1121 
1122 /**
1123  * smk_write_net4addr - write() for /smack/netlabel
1124  * @file: file pointer, not actually used
1125  * @buf: where to get the data from
1126  * @count: bytes sent
1127  * @ppos: where to start
1128  *
1129  * Accepts only one net4addr per write call.
1130  * Returns number of bytes written or error code, as appropriate
1131  */
1132 static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1133                                 size_t count, loff_t *ppos)
1134 {
1135         struct smk_net4addr *snp;
1136         struct sockaddr_in newname;
1137         char *smack;
1138         struct smack_known *skp = NULL;
1139         char *data;
1140         char *host = (char *)&newname.sin_addr.s_addr;
1141         int rc;
1142         struct netlbl_audit audit_info;
1143         struct in_addr mask;
1144         unsigned int m;
1145         unsigned int masks;
1146         int found;
1147         u32 mask_bits = (1<<31);
1148         __be32 nsa;
1149         u32 temp_mask;
1150 
1151         /*
1152          * Must have privilege.
1153          * No partial writes.
1154          * Enough data must be present.
1155          * "<addr/mask, as a.b.c.d/e><space><label>"
1156          * "<addr, as a.b.c.d><space><label>"
1157          */
1158         if (!smack_privileged(CAP_MAC_ADMIN))
1159                 return -EPERM;
1160         if (*ppos != 0)
1161                 return -EINVAL;
1162         if (count < SMK_NETLBLADDRMIN)
1163                 return -EINVAL;
1164 
1165         data = memdup_user_nul(buf, count);
1166         if (IS_ERR(data))
1167                 return PTR_ERR(data);
1168 
1169         smack = kzalloc(count + 1, GFP_KERNEL);
1170         if (smack == NULL) {
1171                 rc = -ENOMEM;
1172                 goto free_data_out;
1173         }
1174 
1175         rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1176                 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1177         if (rc != 6) {
1178                 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1179                         &host[0], &host[1], &host[2], &host[3], smack);
1180                 if (rc != 5) {
1181                         rc = -EINVAL;
1182                         goto free_out;
1183                 }
1184                 m = BEBITS;
1185                 masks = 32;
1186         }
1187         if (masks > BEBITS) {
1188                 rc = -EINVAL;
1189                 goto free_out;
1190         }
1191 
1192         /*
1193          * If smack begins with '-', it is an option, don't import it
1194          */
1195         if (smack[0] != '-') {
1196                 skp = smk_import_entry(smack, 0);
1197                 if (IS_ERR(skp)) {
1198                         rc = PTR_ERR(skp);
1199                         goto free_out;
1200                 }
1201         } else {
1202                 /*
1203                  * Only the -CIPSO option is supported for IPv4
1204                  */
1205                 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1206                         rc = -EINVAL;
1207                         goto free_out;
1208                 }
1209         }
1210 
1211         for (m = masks, temp_mask = 0; m > 0; m--) {
1212                 temp_mask |= mask_bits;
1213                 mask_bits >>= 1;
1214         }
1215         mask.s_addr = cpu_to_be32(temp_mask);
1216 
1217         newname.sin_addr.s_addr &= mask.s_addr;
1218         /*
1219          * Only allow one writer at a time. Writes should be
1220          * quite rare and small in any case.
1221          */
1222         mutex_lock(&smk_net4addr_lock);
1223 
1224         nsa = newname.sin_addr.s_addr;
1225         /* try to find if the prefix is already in the list */
1226         found = 0;
1227         list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1228                 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1229                         found = 1;
1230                         break;
1231                 }
1232         }
1233         smk_netlabel_audit_set(&audit_info);
1234 
1235         if (found == 0) {
1236                 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1237                 if (snp == NULL)
1238                         rc = -ENOMEM;
1239                 else {
1240                         rc = 0;
1241                         snp->smk_host.s_addr = newname.sin_addr.s_addr;
1242                         snp->smk_mask.s_addr = mask.s_addr;
1243                         snp->smk_label = skp;
1244                         snp->smk_masks = masks;
1245                         smk_net4addr_insert(snp);
1246                 }
1247         } else {
1248                 /*
1249                  * Delete the unlabeled entry, only if the previous label
1250                  * wasn't the special CIPSO option
1251                  */
1252                 if (snp->smk_label != NULL)
1253                         rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1254                                         &snp->smk_host, &snp->smk_mask,
1255                                         PF_INET, &audit_info);
1256                 else
1257                         rc = 0;
1258                 snp->smk_label = skp;
1259         }
1260 
1261         /*
1262          * Now tell netlabel about the single label nature of
1263          * this host so that incoming packets get labeled.
1264          * but only if we didn't get the special CIPSO option
1265          */
1266         if (rc == 0 && skp != NULL)
1267                 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1268                         &snp->smk_host, &snp->smk_mask, PF_INET,
1269                         snp->smk_label->smk_secid, &audit_info);
1270 
1271         if (rc == 0)
1272                 rc = count;
1273 
1274         mutex_unlock(&smk_net4addr_lock);
1275 
1276 free_out:
1277         kfree(smack);
1278 free_data_out:
1279         kfree(data);
1280 
1281         return rc;
1282 }
1283 
1284 static const struct file_operations smk_net4addr_ops = {
1285         .open           = smk_open_net4addr,
1286         .read           = seq_read,
1287         .llseek         = seq_lseek,
1288         .write          = smk_write_net4addr,
1289         .release        = seq_release,
1290 };
1291 
1292 #if IS_ENABLED(CONFIG_IPV6)
1293 /*
1294  * Seq_file read operations for /smack/netlabel6
1295  */
1296 
1297 static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1298 {
1299         return smk_seq_start(s, pos, &smk_net6addr_list);
1300 }
1301 
1302 static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1303 {
1304         return smk_seq_next(s, v, pos, &smk_net6addr_list);
1305 }
1306 
1307 /*
1308  * Print host/label pairs
1309  */
1310 static int net6addr_seq_show(struct seq_file *s, void *v)
1311 {
1312         struct list_head *list = v;
1313         struct smk_net6addr *skp =
1314                          list_entry(list, struct smk_net6addr, list);
1315 
1316         if (skp->smk_label != NULL)
1317                 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1318                                 skp->smk_label->smk_known);
1319 
1320         return 0;
1321 }
1322 
1323 static const struct seq_operations net6addr_seq_ops = {
1324         .start = net6addr_seq_start,
1325         .next  = net6addr_seq_next,
1326         .show  = net6addr_seq_show,
1327         .stop  = smk_seq_stop,
1328 };
1329 
1330 /**
1331  * smk_open_net6addr - open() for /smack/netlabel
1332  * @inode: inode structure representing file
1333  * @file: "netlabel" file pointer
1334  *
1335  * Connect our net6addr_seq_* operations with /smack/netlabel
1336  * file_operations
1337  */
1338 static int smk_open_net6addr(struct inode *inode, struct file *file)
1339 {
1340         return seq_open(file, &net6addr_seq_ops);
1341 }
1342 
1343 /**
1344  * smk_net6addr_insert
1345  * @new : entry to insert
1346  *
1347  * This inserts an entry in the smack_net6addrs list
1348  * sorted by netmask length (longest to smallest)
1349  * locked by &smk_net6addr_lock in smk_write_net6addr
1350  *
1351  */
1352 static void smk_net6addr_insert(struct smk_net6addr *new)
1353 {
1354         struct smk_net6addr *m_next;
1355         struct smk_net6addr *m;
1356 
1357         if (list_empty(&smk_net6addr_list)) {
1358                 list_add_rcu(&new->list, &smk_net6addr_list);
1359                 return;
1360         }
1361 
1362         m = list_entry_rcu(smk_net6addr_list.next,
1363                            struct smk_net6addr, list);
1364 
1365         if (new->smk_masks > m->smk_masks) {
1366                 list_add_rcu(&new->list, &smk_net6addr_list);
1367                 return;
1368         }
1369 
1370         list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1371                 if (list_is_last(&m->list, &smk_net6addr_list)) {
1372                         list_add_rcu(&new->list, &m->list);
1373                         return;
1374                 }
1375                 m_next = list_entry_rcu(m->list.next,
1376                                         struct smk_net6addr, list);
1377                 if (new->smk_masks > m_next->smk_masks) {
1378                         list_add_rcu(&new->list, &m->list);
1379                         return;
1380                 }
1381         }
1382 }
1383 
1384 
1385 /**
1386  * smk_write_net6addr - write() for /smack/netlabel
1387  * @file: file pointer, not actually used
1388  * @buf: where to get the data from
1389  * @count: bytes sent
1390  * @ppos: where to start
1391  *
1392  * Accepts only one net6addr per write call.
1393  * Returns number of bytes written or error code, as appropriate
1394  */
1395 static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1396                                 size_t count, loff_t *ppos)
1397 {
1398         struct smk_net6addr *snp;
1399         struct in6_addr newname;
1400         struct in6_addr fullmask;
1401         struct smack_known *skp = NULL;
1402         char *smack;
1403         char *data;
1404         int rc = 0;
1405         int found = 0;
1406         int i;
1407         unsigned int scanned[8];
1408         unsigned int m;
1409         unsigned int mask = 128;
1410 
1411         /*
1412          * Must have privilege.
1413          * No partial writes.
1414          * Enough data must be present.
1415          * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1416          * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1417          */
1418         if (!smack_privileged(CAP_MAC_ADMIN))
1419                 return -EPERM;
1420         if (*ppos != 0)
1421                 return -EINVAL;
1422         if (count < SMK_NETLBLADDRMIN)
1423                 return -EINVAL;
1424 
1425         data = memdup_user_nul(buf, count);
1426         if (IS_ERR(data))
1427                 return PTR_ERR(data);
1428 
1429         smack = kzalloc(count + 1, GFP_KERNEL);
1430         if (smack == NULL) {
1431                 rc = -ENOMEM;
1432                 goto free_data_out;
1433         }
1434 
1435         i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1436                         &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1437                         &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1438                         &mask, smack);
1439         if (i != 10) {
1440                 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1441                                 &scanned[0], &scanned[1], &scanned[2],
1442                                 &scanned[3], &scanned[4], &scanned[5],
1443                                 &scanned[6], &scanned[7], smack);
1444                 if (i != 9) {
1445                         rc = -EINVAL;
1446                         goto free_out;
1447                 }
1448         }
1449         if (mask > 128) {
1450                 rc = -EINVAL;
1451                 goto free_out;
1452         }
1453         for (i = 0; i < 8; i++) {
1454                 if (scanned[i] > 0xffff) {
1455                         rc = -EINVAL;
1456                         goto free_out;
1457                 }
1458                 newname.s6_addr16[i] = htons(scanned[i]);
1459         }
1460 
1461         /*
1462          * If smack begins with '-', it is an option, don't import it
1463          */
1464         if (smack[0] != '-') {
1465                 skp = smk_import_entry(smack, 0);
1466                 if (IS_ERR(skp)) {
1467                         rc = PTR_ERR(skp);
1468                         goto free_out;
1469                 }
1470         } else {
1471                 /*
1472                  * Only -DELETE is supported for IPv6
1473                  */
1474                 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1475                         rc = -EINVAL;
1476                         goto free_out;
1477                 }
1478         }
1479 
1480         for (i = 0, m = mask; i < 8; i++) {
1481                 if (m >= 16) {
1482                         fullmask.s6_addr16[i] = 0xffff;
1483                         m -= 16;
1484                 } else if (m > 0) {
1485                         fullmask.s6_addr16[i] = (1 << m) - 1;
1486                         m = 0;
1487                 } else
1488                         fullmask.s6_addr16[i] = 0;
1489                 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1490         }
1491 
1492         /*
1493          * Only allow one writer at a time. Writes should be
1494          * quite rare and small in any case.
1495          */
1496         mutex_lock(&smk_net6addr_lock);
1497         /*
1498          * Try to find the prefix in the list
1499          */
1500         list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1501                 if (mask != snp->smk_masks)
1502                         continue;
1503                 for (found = 1, i = 0; i < 8; i++) {
1504                         if (newname.s6_addr16[i] !=
1505                             snp->smk_host.s6_addr16[i]) {
1506                                 found = 0;
1507                                 break;
1508                         }
1509                 }
1510                 if (found == 1)
1511                         break;
1512         }
1513         if (found == 0) {
1514                 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1515                 if (snp == NULL)
1516                         rc = -ENOMEM;
1517                 else {
1518                         snp->smk_host = newname;
1519                         snp->smk_mask = fullmask;
1520                         snp->smk_masks = mask;
1521                         snp->smk_label = skp;
1522                         smk_net6addr_insert(snp);
1523                 }
1524         } else {
1525                 snp->smk_label = skp;
1526         }
1527 
1528         if (rc == 0)
1529                 rc = count;
1530 
1531         mutex_unlock(&smk_net6addr_lock);
1532 
1533 free_out:
1534         kfree(smack);
1535 free_data_out:
1536         kfree(data);
1537 
1538         return rc;
1539 }
1540 
1541 static const struct file_operations smk_net6addr_ops = {
1542         .open           = smk_open_net6addr,
1543         .read           = seq_read,
1544         .llseek         = seq_lseek,
1545         .write          = smk_write_net6addr,
1546         .release        = seq_release,
1547 };
1548 #endif /* CONFIG_IPV6 */
1549 
1550 /**
1551  * smk_read_doi - read() for /smack/doi
1552  * @filp: file pointer, not actually used
1553  * @buf: where to put the result
1554  * @count: maximum to send along
1555  * @ppos: where to start
1556  *
1557  * Returns number of bytes read or error code, as appropriate
1558  */
1559 static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1560                             size_t count, loff_t *ppos)
1561 {
1562         char temp[80];
1563         ssize_t rc;
1564 
1565         if (*ppos != 0)
1566                 return 0;
1567 
1568         sprintf(temp, "%d", smk_cipso_doi_value);
1569         rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1570 
1571         return rc;
1572 }
1573 
1574 /**
1575  * smk_write_doi - write() for /smack/doi
1576  * @file: file pointer, not actually used
1577  * @buf: where to get the data from
1578  * @count: bytes sent
1579  * @ppos: where to start
1580  *
1581  * Returns number of bytes written or error code, as appropriate
1582  */
1583 static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1584                              size_t count, loff_t *ppos)
1585 {
1586         char temp[80];
1587         int i;
1588 
1589         if (!smack_privileged(CAP_MAC_ADMIN))
1590                 return -EPERM;
1591 
1592         if (count >= sizeof(temp) || count == 0)
1593                 return -EINVAL;
1594 
1595         if (copy_from_user(temp, buf, count) != 0)
1596                 return -EFAULT;
1597 
1598         temp[count] = '\0';
1599 
1600         if (sscanf(temp, "%d", &i) != 1)
1601                 return -EINVAL;
1602 
1603         smk_cipso_doi_value = i;
1604 
1605         smk_cipso_doi();
1606 
1607         return count;
1608 }
1609 
1610 static const struct file_operations smk_doi_ops = {
1611         .read           = smk_read_doi,
1612         .write          = smk_write_doi,
1613         .llseek         = default_llseek,
1614 };
1615 
1616 /**
1617  * smk_read_direct - read() for /smack/direct
1618  * @filp: file pointer, not actually used
1619  * @buf: where to put the result
1620  * @count: maximum to send along
1621  * @ppos: where to start
1622  *
1623  * Returns number of bytes read or error code, as appropriate
1624  */
1625 static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1626                                size_t count, loff_t *ppos)
1627 {
1628         char temp[80];
1629         ssize_t rc;
1630 
1631         if (*ppos != 0)
1632                 return 0;
1633 
1634         sprintf(temp, "%d", smack_cipso_direct);
1635         rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1636 
1637         return rc;
1638 }
1639 
1640 /**
1641  * smk_write_direct - write() for /smack/direct
1642  * @file: file pointer, not actually used
1643  * @buf: where to get the data from
1644  * @count: bytes sent
1645  * @ppos: where to start
1646  *
1647  * Returns number of bytes written or error code, as appropriate
1648  */
1649 static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1650                                 size_t count, loff_t *ppos)
1651 {
1652         struct smack_known *skp;
1653         char temp[80];
1654         int i;
1655 
1656         if (!smack_privileged(CAP_MAC_ADMIN))
1657                 return -EPERM;
1658 
1659         if (count >= sizeof(temp) || count == 0)
1660                 return -EINVAL;
1661 
1662         if (copy_from_user(temp, buf, count) != 0)
1663                 return -EFAULT;
1664 
1665         temp[count] = '\0';
1666 
1667         if (sscanf(temp, "%d", &i) != 1)
1668                 return -EINVAL;
1669 
1670         /*
1671          * Don't do anything if the value hasn't actually changed.
1672          * If it is changing reset the level on entries that were
1673          * set up to be direct when they were created.
1674          */
1675         if (smack_cipso_direct != i) {
1676                 mutex_lock(&smack_known_lock);
1677                 list_for_each_entry_rcu(skp, &smack_known_list, list)
1678                         if (skp->smk_netlabel.attr.mls.lvl ==
1679                             smack_cipso_direct)
1680                                 skp->smk_netlabel.attr.mls.lvl = i;
1681                 smack_cipso_direct = i;
1682                 mutex_unlock(&smack_known_lock);
1683         }
1684 
1685         return count;
1686 }
1687 
1688 static const struct file_operations smk_direct_ops = {
1689         .read           = smk_read_direct,
1690         .write          = smk_write_direct,
1691         .llseek         = default_llseek,
1692 };
1693 
1694 /**
1695  * smk_read_mapped - read() for /smack/mapped
1696  * @filp: file pointer, not actually used
1697  * @buf: where to put the result
1698  * @count: maximum to send along
1699  * @ppos: where to start
1700  *
1701  * Returns number of bytes read or error code, as appropriate
1702  */
1703 static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1704                                size_t count, loff_t *ppos)
1705 {
1706         char temp[80];
1707         ssize_t rc;
1708 
1709         if (*ppos != 0)
1710                 return 0;
1711 
1712         sprintf(temp, "%d", smack_cipso_mapped);
1713         rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1714 
1715         return rc;
1716 }
1717 
1718 /**
1719  * smk_write_mapped - write() for /smack/mapped
1720  * @file: file pointer, not actually used
1721  * @buf: where to get the data from
1722  * @count: bytes sent
1723  * @ppos: where to start
1724  *
1725  * Returns number of bytes written or error code, as appropriate
1726  */
1727 static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1728                                 size_t count, loff_t *ppos)
1729 {
1730         struct smack_known *skp;
1731         char temp[80];
1732         int i;
1733 
1734         if (!smack_privileged(CAP_MAC_ADMIN))
1735                 return -EPERM;
1736 
1737         if (count >= sizeof(temp) || count == 0)
1738                 return -EINVAL;
1739 
1740         if (copy_from_user(temp, buf, count) != 0)
1741                 return -EFAULT;
1742 
1743         temp[count] = '\0';
1744 
1745         if (sscanf(temp, "%d", &i) != 1)
1746                 return -EINVAL;
1747 
1748         /*
1749          * Don't do anything if the value hasn't actually changed.
1750          * If it is changing reset the level on entries that were
1751          * set up to be mapped when they were created.
1752          */
1753         if (smack_cipso_mapped != i) {
1754                 mutex_lock(&smack_known_lock);
1755                 list_for_each_entry_rcu(skp, &smack_known_list, list)
1756                         if (skp->smk_netlabel.attr.mls.lvl ==
1757                             smack_cipso_mapped)
1758                                 skp->smk_netlabel.attr.mls.lvl = i;
1759                 smack_cipso_mapped = i;
1760                 mutex_unlock(&smack_known_lock);
1761         }
1762 
1763         return count;
1764 }
1765 
1766 static const struct file_operations smk_mapped_ops = {
1767         .read           = smk_read_mapped,
1768         .write          = smk_write_mapped,
1769         .llseek         = default_llseek,
1770 };
1771 
1772 /**
1773  * smk_read_ambient - read() for /smack/ambient
1774  * @filp: file pointer, not actually used
1775  * @buf: where to put the result
1776  * @cn: maximum to send along
1777  * @ppos: where to start
1778  *
1779  * Returns number of bytes read or error code, as appropriate
1780  */
1781 static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1782                                 size_t cn, loff_t *ppos)
1783 {
1784         ssize_t rc;
1785         int asize;
1786 
1787         if (*ppos != 0)
1788                 return 0;
1789         /*
1790          * Being careful to avoid a problem in the case where
1791          * smack_net_ambient gets changed in midstream.
1792          */
1793         mutex_lock(&smack_ambient_lock);
1794 
1795         asize = strlen(smack_net_ambient->smk_known) + 1;
1796 
1797         if (cn >= asize)
1798                 rc = simple_read_from_buffer(buf, cn, ppos,
1799                                              smack_net_ambient->smk_known,
1800                                              asize);
1801         else
1802                 rc = -EINVAL;
1803 
1804         mutex_unlock(&smack_ambient_lock);
1805 
1806         return rc;
1807 }
1808 
1809 /**
1810  * smk_write_ambient - write() for /smack/ambient
1811  * @file: file pointer, not actually used
1812  * @buf: where to get the data from
1813  * @count: bytes sent
1814  * @ppos: where to start
1815  *
1816  * Returns number of bytes written or error code, as appropriate
1817  */
1818 static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1819                                  size_t count, loff_t *ppos)
1820 {
1821         struct smack_known *skp;
1822         char *oldambient;
1823         char *data;
1824         int rc = count;
1825 
1826         if (!smack_privileged(CAP_MAC_ADMIN))
1827                 return -EPERM;
1828 
1829         data = memdup_user_nul(buf, count);
1830         if (IS_ERR(data))
1831                 return PTR_ERR(data);
1832 
1833         skp = smk_import_entry(data, count);
1834         if (IS_ERR(skp)) {
1835                 rc = PTR_ERR(skp);
1836                 goto out;
1837         }
1838 
1839         mutex_lock(&smack_ambient_lock);
1840 
1841         oldambient = smack_net_ambient->smk_known;
1842         smack_net_ambient = skp;
1843         smk_unlbl_ambient(oldambient);
1844 
1845         mutex_unlock(&smack_ambient_lock);
1846 
1847 out:
1848         kfree(data);
1849         return rc;
1850 }
1851 
1852 static const struct file_operations smk_ambient_ops = {
1853         .read           = smk_read_ambient,
1854         .write          = smk_write_ambient,
1855         .llseek         = default_llseek,
1856 };
1857 
1858 /*
1859  * Seq_file operations for /smack/onlycap
1860  */
1861 static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1862 {
1863         return smk_seq_start(s, pos, &smack_onlycap_list);
1864 }
1865 
1866 static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1867 {
1868         return smk_seq_next(s, v, pos, &smack_onlycap_list);
1869 }
1870 
1871 static int onlycap_seq_show(struct seq_file *s, void *v)
1872 {
1873         struct list_head *list = v;
1874         struct smack_known_list_elem *sklep =
1875                 list_entry_rcu(list, struct smack_known_list_elem, list);
1876 
1877         seq_puts(s, sklep->smk_label->smk_known);
1878         seq_putc(s, ' ');
1879 
1880         return 0;
1881 }
1882 
1883 static const struct seq_operations onlycap_seq_ops = {
1884         .start = onlycap_seq_start,
1885         .next  = onlycap_seq_next,
1886         .show  = onlycap_seq_show,
1887         .stop  = smk_seq_stop,
1888 };
1889 
1890 static int smk_open_onlycap(struct inode *inode, struct file *file)
1891 {
1892         return seq_open(file, &onlycap_seq_ops);
1893 }
1894 
1895 /**
1896  * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1897  * The caller must hold appropriate mutex to prevent concurrent modifications
1898  * to the public list.
1899  * Private list is assumed to be not accessible to other threads yet.
1900  *
1901  * @public: public list
1902  * @private: private list
1903  */
1904 static void smk_list_swap_rcu(struct list_head *public,
1905                               struct list_head *private)
1906 {
1907         struct list_head *first, *last;
1908 
1909         if (list_empty(public)) {
1910                 list_splice_init_rcu(private, public, synchronize_rcu);
1911         } else {
1912                 /* Remember public list before replacing it */
1913                 first = public->next;
1914                 last = public->prev;
1915 
1916                 /* Publish private list in place of public in RCU-safe way */
1917                 private->prev->next = public;
1918                 private->next->prev = public;
1919                 rcu_assign_pointer(public->next, private->next);
1920                 public->prev = private->prev;
1921 
1922                 synchronize_rcu();
1923 
1924                 /* When all readers are done with the old public list,
1925                  * attach it in place of private */
1926                 private->next = first;
1927                 private->prev = last;
1928                 first->prev = private;
1929                 last->next = private;
1930         }
1931 }
1932 
1933 /**
1934  * smk_parse_label_list - parse list of Smack labels, separated by spaces
1935  *
1936  * @data: the string to parse
1937  * @private: destination list
1938  *
1939  * Returns zero on success or error code, as appropriate
1940  */
1941 static int smk_parse_label_list(char *data, struct list_head *list)
1942 {
1943         char *tok;
1944         struct smack_known *skp;
1945         struct smack_known_list_elem *sklep;
1946 
1947         while ((tok = strsep(&data, " ")) != NULL) {
1948                 if (!*tok)
1949                         continue;
1950 
1951                 skp = smk_import_entry(tok, 0);
1952                 if (IS_ERR(skp))
1953                         return PTR_ERR(skp);
1954 
1955                 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1956                 if (sklep == NULL)
1957                         return -ENOMEM;
1958 
1959                 sklep->smk_label = skp;
1960                 list_add(&sklep->list, list);
1961         }
1962 
1963         return 0;
1964 }
1965 
1966 /**
1967  * smk_destroy_label_list - destroy a list of smack_known_list_elem
1968  * @head: header pointer of the list to destroy
1969  */
1970 void smk_destroy_label_list(struct list_head *list)
1971 {
1972         struct smack_known_list_elem *sklep;
1973         struct smack_known_list_elem *sklep2;
1974 
1975         list_for_each_entry_safe(sklep, sklep2, list, list)
1976                 kfree(sklep);
1977 
1978         INIT_LIST_HEAD(list);
1979 }
1980 
1981 /**
1982  * smk_write_onlycap - write() for smackfs/onlycap
1983  * @file: file pointer, not actually used
1984  * @buf: where to get the data from
1985  * @count: bytes sent
1986  * @ppos: where to start
1987  *
1988  * Returns number of bytes written or error code, as appropriate
1989  */
1990 static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1991                                  size_t count, loff_t *ppos)
1992 {
1993         char *data;
1994         LIST_HEAD(list_tmp);
1995         int rc;
1996 
1997         if (!smack_privileged(CAP_MAC_ADMIN))
1998                 return -EPERM;
1999 
2000         data = memdup_user_nul(buf, count);
2001         if (IS_ERR(data))
2002                 return PTR_ERR(data);
2003 
2004         rc = smk_parse_label_list(data, &list_tmp);
2005         kfree(data);
2006 
2007         /*
2008          * Clear the smack_onlycap on invalid label errors. This means
2009          * that we can pass a null string to unset the onlycap value.
2010          *
2011          * Importing will also reject a label beginning with '-',
2012          * so "-usecapabilities" will also work.
2013          *
2014          * But do so only on invalid label, not on system errors.
2015          * The invalid label must be first to count as clearing attempt.
2016          */
2017         if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2018                 mutex_lock(&smack_onlycap_lock);
2019                 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2020                 mutex_unlock(&smack_onlycap_lock);
2021                 rc = count;
2022         }
2023 
2024         smk_destroy_label_list(&list_tmp);
2025 
2026         return rc;
2027 }
2028 
2029 static const struct file_operations smk_onlycap_ops = {
2030         .open           = smk_open_onlycap,
2031         .read           = seq_read,
2032         .write          = smk_write_onlycap,
2033         .llseek         = seq_lseek,
2034         .release        = seq_release,
2035 };
2036 
2037 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
2038 /**
2039  * smk_read_unconfined - read() for smackfs/unconfined
2040  * @filp: file pointer, not actually used
2041  * @buf: where to put the result
2042  * @cn: maximum to send along
2043  * @ppos: where to start
2044  *
2045  * Returns number of bytes read or error code, as appropriate
2046  */
2047 static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2048                                         size_t cn, loff_t *ppos)
2049 {
2050         char *smack = "";
2051         ssize_t rc = -EINVAL;
2052         int asize;
2053 
2054         if (*ppos != 0)
2055                 return 0;
2056 
2057         if (smack_unconfined != NULL)
2058                 smack = smack_unconfined->smk_known;
2059 
2060         asize = strlen(smack) + 1;
2061 
2062         if (cn >= asize)
2063                 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2064 
2065         return rc;
2066 }
2067 
2068 /**
2069  * smk_write_unconfined - write() for smackfs/unconfined
2070  * @file: file pointer, not actually used
2071  * @buf: where to get the data from
2072  * @count: bytes sent
2073  * @ppos: where to start
2074  *
2075  * Returns number of bytes written or error code, as appropriate
2076  */
2077 static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2078                                         size_t count, loff_t *ppos)
2079 {
2080         char *data;
2081         struct smack_known *skp;
2082         int rc = count;
2083 
2084         if (!smack_privileged(CAP_MAC_ADMIN))
2085                 return -EPERM;
2086 
2087         data = memdup_user_nul(buf, count);
2088         if (IS_ERR(data))
2089                 return PTR_ERR(data);
2090 
2091         /*
2092          * Clear the smack_unconfined on invalid label errors. This means
2093          * that we can pass a null string to unset the unconfined value.
2094          *
2095          * Importing will also reject a label beginning with '-',
2096          * so "-confine" will also work.
2097          *
2098          * But do so only on invalid label, not on system errors.
2099          */
2100         skp = smk_import_entry(data, count);
2101         if (PTR_ERR(skp) == -EINVAL)
2102                 skp = NULL;
2103         else if (IS_ERR(skp)) {
2104                 rc = PTR_ERR(skp);
2105                 goto freeout;
2106         }
2107 
2108         smack_unconfined = skp;
2109 
2110 freeout:
2111         kfree(data);
2112         return rc;
2113 }
2114 
2115 static const struct file_operations smk_unconfined_ops = {
2116         .read           = smk_read_unconfined,
2117         .write          = smk_write_unconfined,
2118         .llseek         = default_llseek,
2119 };
2120 #endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2121 
2122 /**
2123  * smk_read_logging - read() for /smack/logging
2124  * @filp: file pointer, not actually used
2125  * @buf: where to put the result
2126  * @cn: maximum to send along
2127  * @ppos: where to start
2128  *
2129  * Returns number of bytes read or error code, as appropriate
2130  */
2131 static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2132                                 size_t count, loff_t *ppos)
2133 {
2134         char temp[32];
2135         ssize_t rc;
2136 
2137         if (*ppos != 0)
2138                 return 0;
2139 
2140         sprintf(temp, "%d\n", log_policy);
2141         rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2142         return rc;
2143 }
2144 
2145 /**
2146  * smk_write_logging - write() for /smack/logging
2147  * @file: file pointer, not actually used
2148  * @buf: where to get the data from
2149  * @count: bytes sent
2150  * @ppos: where to start
2151  *
2152  * Returns number of bytes written or error code, as appropriate
2153  */
2154 static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2155                                 size_t count, loff_t *ppos)
2156 {
2157         char temp[32];
2158         int i;
2159 
2160         if (!smack_privileged(CAP_MAC_ADMIN))
2161                 return -EPERM;
2162 
2163         if (count >= sizeof(temp) || count == 0)
2164                 return -EINVAL;
2165 
2166         if (copy_from_user(temp, buf, count) != 0)
2167                 return -EFAULT;
2168 
2169         temp[count] = '\0';
2170 
2171         if (sscanf(temp, "%d", &i) != 1)
2172                 return -EINVAL;
2173         if (i < 0 || i > 3)
2174                 return -EINVAL;
2175         log_policy = i;
2176         return count;
2177 }
2178 
2179 
2180 
2181 static const struct file_operations smk_logging_ops = {
2182         .read           = smk_read_logging,
2183         .write          = smk_write_logging,
2184         .llseek         = default_llseek,
2185 };
2186 
2187 /*
2188  * Seq_file read operations for /smack/load-self
2189  */
2190 
2191 static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2192 {
2193         struct task_smack *tsp = smack_cred(current_cred());
2194 
2195         return smk_seq_start(s, pos, &tsp->smk_rules);
2196 }
2197 
2198 static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2199 {
2200         struct task_smack *tsp = smack_cred(current_cred());
2201 
2202         return smk_seq_next(s, v, pos, &tsp->smk_rules);
2203 }
2204 
2205 static int load_self_seq_show(struct seq_file *s, void *v)
2206 {
2207         struct list_head *list = v;
2208         struct smack_rule *srp =
2209                 list_entry_rcu(list, struct smack_rule, list);
2210 
2211         smk_rule_show(s, srp, SMK_LABELLEN);
2212 
2213         return 0;
2214 }
2215 
2216 static const struct seq_operations load_self_seq_ops = {
2217         .start = load_self_seq_start,
2218         .next  = load_self_seq_next,
2219         .show  = load_self_seq_show,
2220         .stop  = smk_seq_stop,
2221 };
2222 
2223 
2224 /**
2225  * smk_open_load_self - open() for /smack/load-self2
2226  * @inode: inode structure representing file
2227  * @file: "load" file pointer
2228  *
2229  * For reading, use load_seq_* seq_file reading operations.
2230  */
2231 static int smk_open_load_self(struct inode *inode, struct file *file)
2232 {
2233         return seq_open(file, &load_self_seq_ops);
2234 }
2235 
2236 /**
2237  * smk_write_load_self - write() for /smack/load-self
2238  * @file: file pointer, not actually used
2239  * @buf: where to get the data from
2240  * @count: bytes sent
2241  * @ppos: where to start - must be 0
2242  *
2243  */
2244 static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2245                               size_t count, loff_t *ppos)
2246 {
2247         struct task_smack *tsp = smack_cred(current_cred());
2248 
2249         return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2250                                     &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2251 }
2252 
2253 static const struct file_operations smk_load_self_ops = {
2254         .open           = smk_open_load_self,
2255         .read           = seq_read,
2256         .llseek         = seq_lseek,
2257         .write          = smk_write_load_self,
2258         .release        = seq_release,
2259 };
2260 
2261 /**
2262  * smk_user_access - handle access check transaction
2263  * @file: file pointer
2264  * @buf: data from user space
2265  * @count: bytes sent
2266  * @ppos: where to start - must be 0
2267  */
2268 static ssize_t smk_user_access(struct file *file, const char __user *buf,
2269                                 size_t count, loff_t *ppos, int format)
2270 {
2271         struct smack_parsed_rule rule;
2272         char *data;
2273         int res;
2274 
2275         data = simple_transaction_get(file, buf, count);
2276         if (IS_ERR(data))
2277                 return PTR_ERR(data);
2278 
2279         if (format == SMK_FIXED24_FMT) {
2280                 if (count < SMK_LOADLEN)
2281                         return -EINVAL;
2282                 res = smk_parse_rule(data, &rule, 0);
2283         } else {
2284                 /*
2285                  * simple_transaction_get() returns null-terminated data
2286                  */
2287                 res = smk_parse_long_rule(data, &rule, 0, 3);
2288         }
2289 
2290         if (res >= 0)
2291                 res = smk_access(rule.smk_subject, rule.smk_object,
2292                                  rule.smk_access1, NULL);
2293         else if (res != -ENOENT)
2294                 return res;
2295 
2296         /*
2297          * smk_access() can return a value > 0 in the "bringup" case.
2298          */
2299         data[0] = res >= 0 ? '1' : '0';
2300         data[1] = '\0';
2301 
2302         simple_transaction_set(file, 2);
2303 
2304         if (format == SMK_FIXED24_FMT)
2305                 return SMK_LOADLEN;
2306         return count;
2307 }
2308 
2309 /**
2310  * smk_write_access - handle access check transaction
2311  * @file: file pointer
2312  * @buf: data from user space
2313  * @count: bytes sent
2314  * @ppos: where to start - must be 0
2315  */
2316 static ssize_t smk_write_access(struct file *file, const char __user *buf,
2317                                 size_t count, loff_t *ppos)
2318 {
2319         return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2320 }
2321 
2322 static const struct file_operations smk_access_ops = {
2323         .write          = smk_write_access,
2324         .read           = simple_transaction_read,
2325         .release        = simple_transaction_release,
2326         .llseek         = generic_file_llseek,
2327 };
2328 
2329 
2330 /*
2331  * Seq_file read operations for /smack/load2
2332  */
2333 
2334 static int load2_seq_show(struct seq_file *s, void *v)
2335 {
2336         struct list_head *list = v;
2337         struct smack_rule *srp;
2338         struct smack_known *skp =
2339                 list_entry_rcu(list, struct smack_known, list);
2340 
2341         list_for_each_entry_rcu(srp, &skp->smk_rules, list)
2342                 smk_rule_show(s, srp, SMK_LONGLABEL);
2343 
2344         return 0;
2345 }
2346 
2347 static const struct seq_operations load2_seq_ops = {
2348         .start = load2_seq_start,
2349         .next  = load2_seq_next,
2350         .show  = load2_seq_show,
2351         .stop  = smk_seq_stop,
2352 };
2353 
2354 /**
2355  * smk_open_load2 - open() for /smack/load2
2356  * @inode: inode structure representing file
2357  * @file: "load2" file pointer
2358  *
2359  * For reading, use load2_seq_* seq_file reading operations.
2360  */
2361 static int smk_open_load2(struct inode *inode, struct file *file)
2362 {
2363         return seq_open(file, &load2_seq_ops);
2364 }
2365 
2366 /**
2367  * smk_write_load2 - write() for /smack/load2
2368  * @file: file pointer, not actually used
2369  * @buf: where to get the data from
2370  * @count: bytes sent
2371  * @ppos: where to start - must be 0
2372  *
2373  */
2374 static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2375                                 size_t count, loff_t *ppos)
2376 {
2377         /*
2378          * Must have privilege.
2379          */
2380         if (!smack_privileged(CAP_MAC_ADMIN))
2381                 return -EPERM;
2382 
2383         return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2384                                     SMK_LONG_FMT);
2385 }
2386 
2387 static const struct file_operations smk_load2_ops = {
2388         .open           = smk_open_load2,
2389         .read           = seq_read,
2390         .llseek         = seq_lseek,
2391         .write          = smk_write_load2,
2392         .release        = seq_release,
2393 };
2394 
2395 /*
2396  * Seq_file read operations for /smack/load-self2
2397  */
2398 
2399 static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2400 {
2401         struct task_smack *tsp = smack_cred(current_cred());
2402 
2403         return smk_seq_start(s, pos, &tsp->smk_rules);
2404 }
2405 
2406 static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2407 {
2408         struct task_smack *tsp = smack_cred(current_cred());
2409 
2410         return smk_seq_next(s, v, pos, &tsp->smk_rules);
2411 }
2412 
2413 static int load_self2_seq_show(struct seq_file *s, void *v)
2414 {
2415         struct list_head *list = v;
2416         struct smack_rule *srp =
2417                 list_entry_rcu(list, struct smack_rule, list);
2418 
2419         smk_rule_show(s, srp, SMK_LONGLABEL);
2420 
2421         return 0;
2422 }
2423 
2424 static const struct seq_operations load_self2_seq_ops = {
2425         .start = load_self2_seq_start,
2426         .next  = load_self2_seq_next,
2427         .show  = load_self2_seq_show,
2428         .stop  = smk_seq_stop,
2429 };
2430 
2431 /**
2432  * smk_open_load_self2 - open() for /smack/load-self2
2433  * @inode: inode structure representing file
2434  * @file: "load" file pointer
2435  *
2436  * For reading, use load_seq_* seq_file reading operations.
2437  */
2438 static int smk_open_load_self2(struct inode *inode, struct file *file)
2439 {
2440         return seq_open(file, &load_self2_seq_ops);
2441 }
2442 
2443 /**
2444  * smk_write_load_self2 - write() for /smack/load-self2
2445  * @file: file pointer, not actually used
2446  * @buf: where to get the data from
2447  * @count: bytes sent
2448  * @ppos: where to start - must be 0
2449  *
2450  */
2451 static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2452                               size_t count, loff_t *ppos)
2453 {
2454         struct task_smack *tsp = smack_cred(current_cred());
2455 
2456         return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2457                                     &tsp->smk_rules_lock, SMK_LONG_FMT);
2458 }
2459 
2460 static const struct file_operations smk_load_self2_ops = {
2461         .open           = smk_open_load_self2,
2462         .read           = seq_read,
2463         .llseek         = seq_lseek,
2464         .write          = smk_write_load_self2,
2465         .release        = seq_release,
2466 };
2467 
2468 /**
2469  * smk_write_access2 - handle access check transaction
2470  * @file: file pointer
2471  * @buf: data from user space
2472  * @count: bytes sent
2473  * @ppos: where to start - must be 0
2474  */
2475 static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2476                                         size_t count, loff_t *ppos)
2477 {
2478         return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2479 }
2480 
2481 static const struct file_operations smk_access2_ops = {
2482         .write          = smk_write_access2,
2483         .read           = simple_transaction_read,
2484         .release        = simple_transaction_release,
2485         .llseek         = generic_file_llseek,
2486 };
2487 
2488 /**
2489  * smk_write_revoke_subj - write() for /smack/revoke-subject
2490  * @file: file pointer
2491  * @buf: data from user space
2492  * @count: bytes sent
2493  * @ppos: where to start - must be 0
2494  */
2495 static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2496                                 size_t count, loff_t *ppos)
2497 {
2498         char *data;
2499         const char *cp;
2500         struct smack_known *skp;
2501         struct smack_rule *sp;
2502         struct list_head *rule_list;
2503         struct mutex *rule_lock;
2504         int rc = count;
2505 
2506         if (*ppos != 0)
2507                 return -EINVAL;
2508 
2509         if (!smack_privileged(CAP_MAC_ADMIN))
2510                 return -EPERM;
2511 
2512         if (count == 0 || count > SMK_LONGLABEL)
2513                 return -EINVAL;
2514 
2515         data = memdup_user(buf, count);
2516         if (IS_ERR(data))
2517                 return PTR_ERR(data);
2518 
2519         cp = smk_parse_smack(data, count);
2520         if (IS_ERR(cp)) {
2521                 rc = PTR_ERR(cp);
2522                 goto out_data;
2523         }
2524 
2525         skp = smk_find_entry(cp);
2526         if (skp == NULL)
2527                 goto out_cp;
2528 
2529         rule_list = &skp->smk_rules;
2530         rule_lock = &skp->smk_rules_lock;
2531 
2532         mutex_lock(rule_lock);
2533 
2534         list_for_each_entry_rcu(sp, rule_list, list)
2535                 sp->smk_access = 0;
2536 
2537         mutex_unlock(rule_lock);
2538 
2539 out_cp:
2540         kfree(cp);
2541 out_data:
2542         kfree(data);
2543 
2544         return rc;
2545 }
2546 
2547 static const struct file_operations smk_revoke_subj_ops = {
2548         .write          = smk_write_revoke_subj,
2549         .read           = simple_transaction_read,
2550         .release        = simple_transaction_release,
2551         .llseek         = generic_file_llseek,
2552 };
2553 
2554 /**
2555  * smk_init_sysfs - initialize /sys/fs/smackfs
2556  *
2557  */
2558 static int smk_init_sysfs(void)
2559 {
2560         return sysfs_create_mount_point(fs_kobj, "smackfs");
2561 }
2562 
2563 /**
2564  * smk_write_change_rule - write() for /smack/change-rule
2565  * @file: file pointer
2566  * @buf: data from user space
2567  * @count: bytes sent
2568  * @ppos: where to start - must be 0
2569  */
2570 static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2571                                 size_t count, loff_t *ppos)
2572 {
2573         /*
2574          * Must have privilege.
2575          */
2576         if (!smack_privileged(CAP_MAC_ADMIN))
2577                 return -EPERM;
2578 
2579         return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2580                                     SMK_CHANGE_FMT);
2581 }
2582 
2583 static const struct file_operations smk_change_rule_ops = {
2584         .write          = smk_write_change_rule,
2585         .read           = simple_transaction_read,
2586         .release        = simple_transaction_release,
2587         .llseek         = generic_file_llseek,
2588 };
2589 
2590 /**
2591  * smk_read_syslog - read() for smackfs/syslog
2592  * @filp: file pointer, not actually used
2593  * @buf: where to put the result
2594  * @cn: maximum to send along
2595  * @ppos: where to start
2596  *
2597  * Returns number of bytes read or error code, as appropriate
2598  */
2599 static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2600                                 size_t cn, loff_t *ppos)
2601 {
2602         struct smack_known *skp;
2603         ssize_t rc = -EINVAL;
2604         int asize;
2605 
2606         if (*ppos != 0)
2607                 return 0;
2608 
2609         if (smack_syslog_label == NULL)
2610                 skp = &smack_known_star;
2611         else
2612                 skp = smack_syslog_label;
2613 
2614         asize = strlen(skp->smk_known) + 1;
2615 
2616         if (cn >= asize)
2617                 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2618                                                 asize);
2619 
2620         return rc;
2621 }
2622 
2623 /**
2624  * smk_write_syslog - write() for smackfs/syslog
2625  * @file: file pointer, not actually used
2626  * @buf: where to get the data from
2627  * @count: bytes sent
2628  * @ppos: where to start
2629  *
2630  * Returns number of bytes written or error code, as appropriate
2631  */
2632 static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2633                                 size_t count, loff_t *ppos)
2634 {
2635         char *data;
2636         struct smack_known *skp;
2637         int rc = count;
2638 
2639         if (!smack_privileged(CAP_MAC_ADMIN))
2640                 return -EPERM;
2641 
2642         data = memdup_user_nul(buf, count);
2643         if (IS_ERR(data))
2644                 return PTR_ERR(data);
2645 
2646         skp = smk_import_entry(data, count);
2647         if (IS_ERR(skp))
2648                 rc = PTR_ERR(skp);
2649         else
2650                 smack_syslog_label = skp;
2651 
2652         kfree(data);
2653         return rc;
2654 }
2655 
2656 static const struct file_operations smk_syslog_ops = {
2657         .read           = smk_read_syslog,
2658         .write          = smk_write_syslog,
2659         .llseek         = default_llseek,
2660 };
2661 
2662 /*
2663  * Seq_file read operations for /smack/relabel-self
2664  */
2665 
2666 static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2667 {
2668         struct task_smack *tsp = smack_cred(current_cred());
2669 
2670         return smk_seq_start(s, pos, &tsp->smk_relabel);
2671 }
2672 
2673 static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2674 {
2675         struct task_smack *tsp = smack_cred(current_cred());
2676 
2677         return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2678 }
2679 
2680 static int relabel_self_seq_show(struct seq_file *s, void *v)
2681 {
2682         struct list_head *list = v;
2683         struct smack_known_list_elem *sklep =
2684                 list_entry(list, struct smack_known_list_elem, list);
2685 
2686         seq_puts(s, sklep->smk_label->smk_known);
2687         seq_putc(s, ' ');
2688 
2689         return 0;
2690 }
2691 
2692 static const struct seq_operations relabel_self_seq_ops = {
2693         .start = relabel_self_seq_start,
2694         .next  = relabel_self_seq_next,
2695         .show  = relabel_self_seq_show,
2696         .stop  = smk_seq_stop,
2697 };
2698 
2699 /**
2700  * smk_open_relabel_self - open() for /smack/relabel-self
2701  * @inode: inode structure representing file
2702  * @file: "relabel-self" file pointer
2703  *
2704  * Connect our relabel_self_seq_* operations with /smack/relabel-self
2705  * file_operations
2706  */
2707 static int smk_open_relabel_self(struct inode *inode, struct file *file)
2708 {
2709         return seq_open(file, &relabel_self_seq_ops);
2710 }
2711 
2712 /**
2713  * smk_write_relabel_self - write() for /smack/relabel-self
2714  * @file: file pointer, not actually used
2715  * @buf: where to get the data from
2716  * @count: bytes sent
2717  * @ppos: where to start - must be 0
2718  *
2719  */
2720 static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2721                                 size_t count, loff_t *ppos)
2722 {
2723         struct task_smack *tsp = smack_cred(current_cred());
2724         char *data;
2725         int rc;
2726         LIST_HEAD(list_tmp);
2727 
2728         /*
2729          * Must have privilege.
2730          */
2731         if (!smack_privileged(CAP_MAC_ADMIN))
2732                 return -EPERM;
2733 
2734         /*
2735          * Enough data must be present.
2736          */
2737         if (*ppos != 0)
2738                 return -EINVAL;
2739 
2740         data = memdup_user_nul(buf, count);
2741         if (IS_ERR(data))
2742                 return PTR_ERR(data);
2743 
2744         rc = smk_parse_label_list(data, &list_tmp);
2745         kfree(data);
2746 
2747         if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2748                 smk_destroy_label_list(&tsp->smk_relabel);
2749                 list_splice(&list_tmp, &tsp->smk_relabel);
2750                 return count;
2751         }
2752 
2753         smk_destroy_label_list(&list_tmp);
2754         return rc;
2755 }
2756 
2757 static const struct file_operations smk_relabel_self_ops = {
2758         .open           = smk_open_relabel_self,
2759         .read           = seq_read,
2760         .llseek         = seq_lseek,
2761         .write          = smk_write_relabel_self,
2762         .release        = seq_release,
2763 };
2764 
2765 /**
2766  * smk_read_ptrace - read() for /smack/ptrace
2767  * @filp: file pointer, not actually used
2768  * @buf: where to put the result
2769  * @count: maximum to send along
2770  * @ppos: where to start
2771  *
2772  * Returns number of bytes read or error code, as appropriate
2773  */
2774 static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2775                                size_t count, loff_t *ppos)
2776 {
2777         char temp[32];
2778         ssize_t rc;
2779 
2780         if (*ppos != 0)
2781                 return 0;
2782 
2783         sprintf(temp, "%d\n", smack_ptrace_rule);
2784         rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2785         return rc;
2786 }
2787 
2788 /**
2789  * smk_write_ptrace - write() for /smack/ptrace
2790  * @file: file pointer
2791  * @buf: data from user space
2792  * @count: bytes sent
2793  * @ppos: where to start - must be 0
2794  */
2795 static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2796                                 size_t count, loff_t *ppos)
2797 {
2798         char temp[32];
2799         int i;
2800 
2801         if (!smack_privileged(CAP_MAC_ADMIN))
2802                 return -EPERM;
2803 
2804         if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2805                 return -EINVAL;
2806 
2807         if (copy_from_user(temp, buf, count) != 0)
2808                 return -EFAULT;
2809 
2810         temp[count] = '\0';
2811 
2812         if (sscanf(temp, "%d", &i) != 1)
2813                 return -EINVAL;
2814         if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2815                 return -EINVAL;
2816         smack_ptrace_rule = i;
2817 
2818         return count;
2819 }
2820 
2821 static const struct file_operations smk_ptrace_ops = {
2822         .write          = smk_write_ptrace,
2823         .read           = smk_read_ptrace,
2824         .llseek         = default_llseek,
2825 };
2826 
2827 /**
2828  * smk_fill_super - fill the smackfs superblock
2829  * @sb: the empty superblock
2830  * @fc: unused
2831  *
2832  * Fill in the well known entries for the smack filesystem
2833  *
2834  * Returns 0 on success, an error code on failure
2835  */
2836 static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
2837 {
2838         int rc;
2839 
2840         static const struct tree_descr smack_files[] = {
2841                 [SMK_LOAD] = {
2842                         "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2843                 [SMK_CIPSO] = {
2844                         "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2845                 [SMK_DOI] = {
2846                         "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2847                 [SMK_DIRECT] = {
2848                         "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2849                 [SMK_AMBIENT] = {
2850                         "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2851                 [SMK_NET4ADDR] = {
2852                         "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2853                 [SMK_ONLYCAP] = {
2854                         "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2855                 [SMK_LOGGING] = {
2856                         "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2857                 [SMK_LOAD_SELF] = {
2858                         "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2859                 [SMK_ACCESSES] = {
2860                         "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2861                 [SMK_MAPPED] = {
2862                         "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2863                 [SMK_LOAD2] = {
2864                         "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2865                 [SMK_LOAD_SELF2] = {
2866                         "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2867                 [SMK_ACCESS2] = {
2868                         "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2869                 [SMK_CIPSO2] = {
2870                         "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2871                 [SMK_REVOKE_SUBJ] = {
2872                         "revoke-subject", &smk_revoke_subj_ops,
2873                         S_IRUGO|S_IWUSR},
2874                 [SMK_CHANGE_RULE] = {
2875                         "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2876                 [SMK_SYSLOG] = {
2877                         "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2878                 [SMK_PTRACE] = {
2879                         "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2880 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
2881                 [SMK_UNCONFINED] = {
2882                         "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2883 #endif
2884 #if IS_ENABLED(CONFIG_IPV6)
2885                 [SMK_NET6ADDR] = {
2886                         "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2887 #endif /* CONFIG_IPV6 */
2888                 [SMK_RELABEL_SELF] = {
2889                         "relabel-self", &smk_relabel_self_ops,
2890                                 S_IRUGO|S_IWUGO},
2891                 /* last one */
2892                         {""}
2893         };
2894 
2895         rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2896         if (rc != 0) {
2897                 printk(KERN_ERR "%s failed %d while creating inodes\n",
2898                         __func__, rc);
2899                 return rc;
2900         }
2901 
2902         return 0;
2903 }
2904 
2905 /**
2906  * smk_get_tree - get the smackfs superblock
2907  * @fc: The mount context, including any options
2908  *
2909  * Just passes everything along.
2910  *
2911  * Returns what the lower level code does.
2912  */
2913 static int smk_get_tree(struct fs_context *fc)
2914 {
2915         return get_tree_single(fc, smk_fill_super);
2916 }
2917 
2918 static const struct fs_context_operations smk_context_ops = {
2919         .get_tree       = smk_get_tree,
2920 };
2921 
2922 /**
2923  * smk_init_fs_context - Initialise a filesystem context for smackfs
2924  * @fc: The blank mount context
2925  */
2926 static int smk_init_fs_context(struct fs_context *fc)
2927 {
2928         fc->ops = &smk_context_ops;
2929         return 0;
2930 }
2931 
2932 static struct file_system_type smk_fs_type = {
2933         .name           = "smackfs",
2934         .init_fs_context = smk_init_fs_context,
2935         .kill_sb        = kill_litter_super,
2936 };
2937 
2938 static struct vfsmount *smackfs_mount;
2939 
2940 static int __init smk_preset_netlabel(struct smack_known *skp)
2941 {
2942         skp->smk_netlabel.domain = skp->smk_known;
2943         skp->smk_netlabel.flags =
2944                 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2945         return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2946                                 &skp->smk_netlabel, strlen(skp->smk_known));
2947 }
2948 
2949 /**
2950  * init_smk_fs - get the smackfs superblock
2951  *
2952  * register the smackfs
2953  *
2954  * Do not register smackfs if Smack wasn't enabled
2955  * on boot. We can not put this method normally under the
2956  * smack_init() code path since the security subsystem get
2957  * initialized before the vfs caches.
2958  *
2959  * Returns true if we were not chosen on boot or if
2960  * we were chosen and filesystem registration succeeded.
2961  */
2962 static int __init init_smk_fs(void)
2963 {
2964         int err;
2965         int rc;
2966 
2967         if (smack_enabled == 0)
2968                 return 0;
2969 
2970         err = smk_init_sysfs();
2971         if (err)
2972                 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2973 
2974         err = register_filesystem(&smk_fs_type);
2975         if (!err) {
2976                 smackfs_mount = kern_mount(&smk_fs_type);
2977                 if (IS_ERR(smackfs_mount)) {
2978                         printk(KERN_ERR "smackfs:  could not mount!\n");
2979                         err = PTR_ERR(smackfs_mount);
2980                         smackfs_mount = NULL;
2981                 }
2982         }
2983 
2984         smk_cipso_doi();
2985         smk_unlbl_ambient(NULL);
2986 
2987         rc = smk_preset_netlabel(&smack_known_floor);
2988         if (err == 0 && rc < 0)
2989                 err = rc;
2990         rc = smk_preset_netlabel(&smack_known_hat);
2991         if (err == 0 && rc < 0)
2992                 err = rc;
2993         rc = smk_preset_netlabel(&smack_known_huh);
2994         if (err == 0 && rc < 0)
2995                 err = rc;
2996         rc = smk_preset_netlabel(&smack_known_star);
2997         if (err == 0 && rc < 0)
2998                 err = rc;
2999         rc = smk_preset_netlabel(&smack_known_web);
3000         if (err == 0 && rc < 0)
3001                 err = rc;
3002 
3003         return err;
3004 }
3005 
3006 __initcall(init_smk_fs);