security/integrity/ima/ima_policy.c

   1 /*
   2  * Copyright (C) 2008 IBM Corporation
   3  * Author: Mimi Zohar <zohar@us.ibm.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, version 2 of the License.
   8  *
   9  * ima_policy.c
  10  *      - initialize default measure policy rules
  11  *
  12  */
  13 #include <linux/module.h>
  14 #include <linux/list.h>
  15 #include <linux/fs.h>
  16 #include <linux/security.h>
  17 #include <linux/magic.h>
  18 #include <linux/parser.h>
  19 #include <linux/slab.h>
  20 #include <linux/rculist.h>
  21 #include <linux/genhd.h>
  22 #include <linux/seq_file.h>
  23
  24 #include "ima.h"
  25
  26 /* flags definitions */
  27 #define IMA_FUNC        0x0001
  28 #define IMA_MASK        0x0002
  29 #define IMA_FSMAGIC     0x0004
  30 #define IMA_UID         0x0008
  31 #define IMA_FOWNER      0x0010
  32 #define IMA_FSUUID      0x0020
  33 #define IMA_INMASK      0x0040
  34 #define IMA_EUID        0x0080
  35 #define IMA_PCR         0x0100
  36
  37 #define UNKNOWN         0
  38 #define MEASURE         0x0001  /* same as IMA_MEASURE */
  39 #define DONT_MEASURE    0x0002
  40 #define APPRAISE        0x0004  /* same as IMA_APPRAISE */
  41 #define DONT_APPRAISE   0x0008
  42 #define AUDIT           0x0040
  43
  44 #define INVALID_PCR(a) (((a) < 0) || \
  45         (a) >= (FIELD_SIZEOF(struct integrity_iint_cache, measured_pcrs) * 8))
  46
  47 int ima_policy_flag;
  48 static int temp_ima_appraise;
  49
  50 #define MAX_LSM_RULES 6
  51 enum lsm_rule_types { LSM_OBJ_USER, LSM_OBJ_ROLE, LSM_OBJ_TYPE,
  52         LSM_SUBJ_USER, LSM_SUBJ_ROLE, LSM_SUBJ_TYPE
  53 };
  54
  55 enum policy_types { ORIGINAL_TCB = 1, DEFAULT_TCB };
  56
  57 struct ima_rule_entry {
  58         struct list_head list;
  59         int action;
  60         unsigned int flags;
  61         enum ima_hooks func;
  62         int mask;
  63         unsigned long fsmagic;
  64         u8 fsuuid[16];
  65         kuid_t uid;
  66         kuid_t fowner;
  67         bool (*uid_op)(kuid_t, kuid_t);    /* Handlers for operators       */
  68         bool (*fowner_op)(kuid_t, kuid_t); /* uid_eq(), uid_gt(), uid_lt() */
  69         int pcr;
  70         struct {
  71                 void *rule;     /* LSM file metadata specific */
  72                 void *args_p;   /* audit value */
  73                 int type;       /* audit type */
  74         } lsm[MAX_LSM_RULES];
  75 };
  76
  77 /*
  78  * Without LSM specific knowledge, the default policy can only be
  79  * written in terms of .action, .func, .mask, .fsmagic, .uid, and .fowner
  80  */
  81
  82 /*
  83  * The minimum rule set to allow for full TCB coverage.  Measures all files
  84  * opened or mmap for exec and everything read by root.  Dangerous because
  85  * normal users can easily run the machine out of memory simply building
  86  * and running executables.
  87  */
  88 static struct ima_rule_entry dont_measure_rules[] __ro_after_init = {
  89         {.action = DONT_MEASURE, .fsmagic = PROC_SUPER_MAGIC, .flags = IMA_FSMAGIC},
  90         {.action = DONT_MEASURE, .fsmagic = SYSFS_MAGIC, .flags = IMA_FSMAGIC},
  91         {.action = DONT_MEASURE, .fsmagic = DEBUGFS_MAGIC, .flags = IMA_FSMAGIC},
  92         {.action = DONT_MEASURE, .fsmagic = TMPFS_MAGIC, .flags = IMA_FSMAGIC},
  93         {.action = DONT_MEASURE, .fsmagic = DEVPTS_SUPER_MAGIC, .flags = IMA_FSMAGIC},
  94         {.action = DONT_MEASURE, .fsmagic = BINFMTFS_MAGIC, .flags = IMA_FSMAGIC},
  95         {.action = DONT_MEASURE, .fsmagic = SECURITYFS_MAGIC, .flags = IMA_FSMAGIC},
  96         {.action = DONT_MEASURE, .fsmagic = SELINUX_MAGIC, .flags = IMA_FSMAGIC},
  97         {.action = DONT_MEASURE, .fsmagic = CGROUP_SUPER_MAGIC,
  98          .flags = IMA_FSMAGIC},
  99         {.action = DONT_MEASURE, .fsmagic = NSFS_MAGIC, .flags = IMA_FSMAGIC}
 100 };
 101
 102 static struct ima_rule_entry original_measurement_rules[] __ro_after_init = {
 103         {.action = MEASURE, .func = MMAP_CHECK, .mask = MAY_EXEC,
 104          .flags = IMA_FUNC | IMA_MASK},
 105         {.action = MEASURE, .func = BPRM_CHECK, .mask = MAY_EXEC,
 106          .flags = IMA_FUNC | IMA_MASK},
 107         {.action = MEASURE, .func = FILE_CHECK, .mask = MAY_READ,
 108          .uid = GLOBAL_ROOT_UID, .uid_op = &uid_eq,
 109          .flags = IMA_FUNC | IMA_MASK | IMA_UID},
 110         {.action = MEASURE, .func = MODULE_CHECK, .flags = IMA_FUNC},
 111         {.action = MEASURE, .func = FIRMWARE_CHECK, .flags = IMA_FUNC},
 112 };
 113
 114 static struct ima_rule_entry default_measurement_rules[] __ro_after_init = {
 115         {.action = MEASURE, .func = MMAP_CHECK, .mask = MAY_EXEC,
 116          .flags = IMA_FUNC | IMA_MASK},
 117         {.action = MEASURE, .func = BPRM_CHECK, .mask = MAY_EXEC,
 118          .flags = IMA_FUNC | IMA_MASK},
 119         {.action = MEASURE, .func = FILE_CHECK, .mask = MAY_READ,
 120          .uid = GLOBAL_ROOT_UID, .uid_op = &uid_eq,
 121          .flags = IMA_FUNC | IMA_INMASK | IMA_EUID},
 122         {.action = MEASURE, .func = FILE_CHECK, .mask = MAY_READ,
 123          .uid = GLOBAL_ROOT_UID, .uid_op = &uid_eq,
 124          .flags = IMA_FUNC | IMA_INMASK | IMA_UID},
 125         {.action = MEASURE, .func = MODULE_CHECK, .flags = IMA_FUNC},
 126         {.action = MEASURE, .func = FIRMWARE_CHECK, .flags = IMA_FUNC},
 127         {.action = MEASURE, .func = POLICY_CHECK, .flags = IMA_FUNC},
 128 };
 129
 130 static struct ima_rule_entry default_appraise_rules[] __ro_after_init = {
 131         {.action = DONT_APPRAISE, .fsmagic = PROC_SUPER_MAGIC, .flags = IMA_FSMAGIC},
 132         {.action = DONT_APPRAISE, .fsmagic = SYSFS_MAGIC, .flags = IMA_FSMAGIC},
 133         {.action = DONT_APPRAISE, .fsmagic = DEBUGFS_MAGIC, .flags = IMA_FSMAGIC},
 134         {.action = DONT_APPRAISE, .fsmagic = TMPFS_MAGIC, .flags = IMA_FSMAGIC},
 135         {.action = DONT_APPRAISE, .fsmagic = RAMFS_MAGIC, .flags = IMA_FSMAGIC},
 136         {.action = DONT_APPRAISE, .fsmagic = DEVPTS_SUPER_MAGIC, .flags = IMA_FSMAGIC},
 137         {.action = DONT_APPRAISE, .fsmagic = BINFMTFS_MAGIC, .flags = IMA_FSMAGIC},
 138         {.action = DONT_APPRAISE, .fsmagic = SECURITYFS_MAGIC, .flags = IMA_FSMAGIC},
 139         {.action = DONT_APPRAISE, .fsmagic = SELINUX_MAGIC, .flags = IMA_FSMAGIC},
 140         {.action = DONT_APPRAISE, .fsmagic = NSFS_MAGIC, .flags = IMA_FSMAGIC},
 141         {.action = DONT_APPRAISE, .fsmagic = CGROUP_SUPER_MAGIC, .flags = IMA_FSMAGIC},
 142 #ifdef CONFIG_IMA_WRITE_POLICY
 143         {.action = APPRAISE, .func = POLICY_CHECK,
 144         .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED},
 145 #endif
 146 #ifndef CONFIG_IMA_APPRAISE_SIGNED_INIT
 147         {.action = APPRAISE, .fowner = GLOBAL_ROOT_UID, .fowner_op = &uid_eq,
 148          .flags = IMA_FOWNER},
 149 #else
 150         /* force signature */
 151         {.action = APPRAISE, .fowner = GLOBAL_ROOT_UID, .fowner_op = &uid_eq,
 152          .flags = IMA_FOWNER | IMA_DIGSIG_REQUIRED},
 153 #endif
 154 };
 155
 156 static struct ima_rule_entry secure_boot_rules[] __ro_after_init = {
 157         {.action = APPRAISE, .func = MODULE_CHECK,
 158          .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED},
 159         {.action = APPRAISE, .func = FIRMWARE_CHECK,
 160          .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED},
 161         {.action = APPRAISE, .func = KEXEC_KERNEL_CHECK,
 162          .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED},
 163         {.action = APPRAISE, .func = POLICY_CHECK,
 164          .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED},
 165 };
 166
 167 static LIST_HEAD(ima_default_rules);
 168 static LIST_HEAD(ima_policy_rules);
 169 static LIST_HEAD(ima_temp_rules);
 170 static struct list_head *ima_rules;
 171
 172 static int ima_policy __initdata;
 173
 174 static int __init default_measure_policy_setup(char *str)
 175 {
 176         if (ima_policy)
 177                 return 1;
 178
 179         ima_policy = ORIGINAL_TCB;
 180         return 1;
 181 }
 182 __setup("ima_tcb", default_measure_policy_setup);
 183
 184 static bool ima_use_appraise_tcb __initdata;
 185 static bool ima_use_secure_boot __initdata;
 186 static int __init policy_setup(char *str)
 187 {
 188         char *p;
 189
 190         while ((p = strsep(&str, " |\n")) != NULL) {
 191                 if (*p == ' ')
 192                         continue;
 193                 if ((strcmp(p, "tcb") == 0) && !ima_policy)
 194                         ima_policy = DEFAULT_TCB;
 195                 else if (strcmp(p, "appraise_tcb") == 0)
 196                         ima_use_appraise_tcb = 1;
 197                 else if (strcmp(p, "secure_boot") == 0)
 198                         ima_use_secure_boot = 1;
 199         }
 200
 201         return 1;
 202 }
 203 __setup("ima_policy=", policy_setup);
 204
 205 static int __init default_appraise_policy_setup(char *str)
 206 {
 207         ima_use_appraise_tcb = 1;
 208         return 1;
 209 }
 210 __setup("ima_appraise_tcb", default_appraise_policy_setup);
 211
 212 /*
 213  * The LSM policy can be reloaded, leaving the IMA LSM based rules referring
 214  * to the old, stale LSM policy.  Update the IMA LSM based rules to reflect
 215  * the reloaded LSM policy.  We assume the rules still exist; and BUG_ON() if
 216  * they don't.
 217  */
 218 static void ima_lsm_update_rules(void)
 219 {
 220         struct ima_rule_entry *entry;
 221         int result;
 222         int i;
 223
 224         list_for_each_entry(entry, &ima_policy_rules, list) {
 225                 for (i = 0; i < MAX_LSM_RULES; i++) {
 226                         if (!entry->lsm[i].rule)
 227                                 continue;
 228                         result = security_filter_rule_init(entry->lsm[i].type,
 229                                                            Audit_equal,
 230                                                            entry->lsm[i].args_p,
 231                                                            &entry->lsm[i].rule);
 232                         BUG_ON(!entry->lsm[i].rule);
 233                 }
 234         }
 235 }
 236
 237 /**
 238  * ima_match_rules - determine whether an inode matches the measure rule.
 239  * @rule: a pointer to a rule
 240  * @inode: a pointer to an inode
 241  * @func: LIM hook identifier
 242  * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
 243  *
 244  * Returns true on rule match, false on failure.
 245  */
 246 static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
 247                             enum ima_hooks func, int mask)
 248 {
 249         struct task_struct *tsk = current;
 250         const struct cred *cred = current_cred();
 251         int i;
 252
 253         if ((rule->flags & IMA_FUNC) &&
 254             (rule->func != func && func != POST_SETATTR))
 255                 return false;
 256         if ((rule->flags & IMA_MASK) &&
 257             (rule->mask != mask && func != POST_SETATTR))
 258                 return false;
 259         if ((rule->flags & IMA_INMASK) &&
 260             (!(rule->mask & mask) && func != POST_SETATTR))
 261                 return false;
 262         if ((rule->flags & IMA_FSMAGIC)
 263             && rule->fsmagic != inode->i_sb->s_magic)
 264                 return false;
 265         if ((rule->flags & IMA_FSUUID) &&
 266             memcmp(rule->fsuuid, inode->i_sb->s_uuid, sizeof(rule->fsuuid)))
 267                 return false;
 268         if ((rule->flags & IMA_UID) && !rule->uid_op(cred->uid, rule->uid))
 269                 return false;
 270         if (rule->flags & IMA_EUID) {
 271                 if (has_capability_noaudit(current, CAP_SETUID)) {
 272                         if (!rule->uid_op(cred->euid, rule->uid)
 273                             && !rule->uid_op(cred->suid, rule->uid)
 274                             && !rule->uid_op(cred->uid, rule->uid))
 275                                 return false;
 276                 } else if (!rule->uid_op(cred->euid, rule->uid))
 277                         return false;
 278         }
 279
 280         if ((rule->flags & IMA_FOWNER) &&
 281             !rule->fowner_op(inode->i_uid, rule->fowner))
 282                 return false;
 283         for (i = 0; i < MAX_LSM_RULES; i++) {
 284                 int rc = 0;
 285                 u32 osid, sid;
 286                 int retried = 0;
 287
 288                 if (!rule->lsm[i].rule)
 289                         continue;
 290 retry:
 291                 switch (i) {
 292                 case LSM_OBJ_USER:
 293                 case LSM_OBJ_ROLE:
 294                 case LSM_OBJ_TYPE:
 295                         security_inode_getsecid(inode, &osid);
 296                         rc = security_filter_rule_match(osid,
 297                                                         rule->lsm[i].type,
 298                                                         Audit_equal,
 299                                                         rule->lsm[i].rule,
 300                                                         NULL);
 301                         break;
 302                 case LSM_SUBJ_USER:
 303                 case LSM_SUBJ_ROLE:
 304                 case LSM_SUBJ_TYPE:
 305                         security_task_getsecid(tsk, &sid);
 306                         rc = security_filter_rule_match(sid,
 307                                                         rule->lsm[i].type,
 308                                                         Audit_equal,
 309                                                         rule->lsm[i].rule,
 310                                                         NULL);
 311                 default:
 312                         break;
 313                 }
 314                 if ((rc < 0) && (!retried)) {
 315                         retried = 1;
 316                         ima_lsm_update_rules();
 317                         goto retry;
 318                 }
 319                 if (!rc)
 320                         return false;
 321         }
 322         return true;
 323 }
 324
 325 /*
 326  * In addition to knowing that we need to appraise the file in general,
 327  * we need to differentiate between calling hooks, for hook specific rules.
 328  */
 329 static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
 330 {
 331         if (!(rule->flags & IMA_FUNC))
 332                 return IMA_FILE_APPRAISE;
 333
 334         switch (func) {
 335         case MMAP_CHECK:
 336                 return IMA_MMAP_APPRAISE;
 337         case BPRM_CHECK:
 338                 return IMA_BPRM_APPRAISE;
 339         case FILE_CHECK:
 340         case POST_SETATTR:
 341                 return IMA_FILE_APPRAISE;
 342         case MODULE_CHECK ... MAX_CHECK - 1:
 343         default:
 344                 return IMA_READ_APPRAISE;
 345         }
 346 }
 347
 348 /**
 349  * ima_match_policy - decision based on LSM and other conditions
 350  * @inode: pointer to an inode for which the policy decision is being made
 351  * @func: IMA hook identifier
 352  * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
 353  * @pcr: set the pcr to extend
 354  *
 355  * Measure decision based on func/mask/fsmagic and LSM(subj/obj/type)
 356  * conditions.
 357  *
 358  * Since the IMA policy may be updated multiple times we need to lock the
 359  * list when walking it.  Reads are many orders of magnitude more numerous
 360  * than writes so ima_match_policy() is classical RCU candidate.
 361  */
 362 int ima_match_policy(struct inode *inode, enum ima_hooks func, int mask,
 363                      int flags, int *pcr)
 364 {
 365         struct ima_rule_entry *entry;
 366         int action = 0, actmask = flags | (flags << 1);
 367
 368         rcu_read_lock();
 369         list_for_each_entry_rcu(entry, ima_rules, list) {
 370
 371                 if (!(entry->action & actmask))
 372                         continue;
 373
 374                 if (!ima_match_rules(entry, inode, func, mask))
 375                         continue;
 376
 377                 action |= entry->flags & IMA_ACTION_FLAGS;
 378
 379                 action |= entry->action & IMA_DO_MASK;
 380                 if (entry->action & IMA_APPRAISE)
 381                         action |= get_subaction(entry, func);
 382
 383                 if (entry->action & IMA_DO_MASK)
 384                         actmask &= ~(entry->action | entry->action << 1);
 385                 else
 386                         actmask &= ~(entry->action | entry->action >> 1);
 387
 388                 if ((pcr) && (entry->flags & IMA_PCR))
 389                         *pcr = entry->pcr;
 390
 391                 if (!actmask)
 392                         break;
 393         }
 394         rcu_read_unlock();
 395
 396         return action;
 397 }
 398
 399 /*
 400  * Initialize the ima_policy_flag variable based on the currently
 401  * loaded policy.  Based on this flag, the decision to short circuit
 402  * out of a function or not call the function in the first place
 403  * can be made earlier.
 404  */
 405 void ima_update_policy_flag(void)
 406 {
 407         struct ima_rule_entry *entry;
 408
 409         list_for_each_entry(entry, ima_rules, list) {
 410                 if (entry->action & IMA_DO_MASK)
 411                         ima_policy_flag |= entry->action;
 412         }
 413
 414         ima_appraise |= temp_ima_appraise;
 415         if (!ima_appraise)
 416                 ima_policy_flag &= ~IMA_APPRAISE;
 417 }
 418
 419 /**
 420  * ima_init_policy - initialize the default measure rules.
 421  *
 422  * ima_rules points to either the ima_default_rules or the
 423  * the new ima_policy_rules.
 424  */
 425 void __init ima_init_policy(void)
 426 {
 427         int i, measure_entries, appraise_entries, secure_boot_entries;
 428
 429         /* if !ima_policy set entries = 0 so we load NO default rules */
 430         measure_entries = ima_policy ? ARRAY_SIZE(dont_measure_rules) : 0;
 431         appraise_entries = ima_use_appraise_tcb ?
 432                          ARRAY_SIZE(default_appraise_rules) : 0;
 433         secure_boot_entries = ima_use_secure_boot ?
 434                         ARRAY_SIZE(secure_boot_rules) : 0;
 435
 436         for (i = 0; i < measure_entries; i++)
 437                 list_add_tail(&dont_measure_rules[i].list, &ima_default_rules);
 438
 439         switch (ima_policy) {
 440         case ORIGINAL_TCB:
 441                 for (i = 0; i < ARRAY_SIZE(original_measurement_rules); i++)
 442                         list_add_tail(&original_measurement_rules[i].list,
 443                                       &ima_default_rules);
 444                 break;
 445         case DEFAULT_TCB:
 446                 for (i = 0; i < ARRAY_SIZE(default_measurement_rules); i++)
 447                         list_add_tail(&default_measurement_rules[i].list,
 448                                       &ima_default_rules);
 449         default:
 450                 break;
 451         }
 452
 453         /*
 454          * Insert the appraise rules requiring file signatures, prior to
 455          * any other appraise rules.
 456          */
 457         for (i = 0; i < secure_boot_entries; i++)
 458                 list_add_tail(&secure_boot_rules[i].list,
 459                               &ima_default_rules);
 460
 461         for (i = 0; i < appraise_entries; i++) {
 462                 list_add_tail(&default_appraise_rules[i].list,
 463                               &ima_default_rules);
 464                 if (default_appraise_rules[i].func == POLICY_CHECK)
 465                         temp_ima_appraise |= IMA_APPRAISE_POLICY;
 466         }
 467
 468         ima_rules = &ima_default_rules;
 469         ima_update_policy_flag();
 470 }
 471
 472 /* Make sure we have a valid policy, at least containing some rules. */
 473 int ima_check_policy(void)
 474 {
 475         if (list_empty(&ima_temp_rules))
 476                 return -EINVAL;
 477         return 0;
 478 }
 479
 480 /**
 481  * ima_update_policy - update default_rules with new measure rules
 482  *
 483  * Called on file .release to update the default rules with a complete new
 484  * policy.  What we do here is to splice ima_policy_rules and ima_temp_rules so
 485  * they make a queue.  The policy may be updated multiple times and this is the
 486  * RCU updater.
 487  *
 488  * Policy rules are never deleted so ima_policy_flag gets zeroed only once when
 489  * we switch from the default policy to user defined.
 490  */
 491 void ima_update_policy(void)
 492 {
 493         struct list_head *first, *last, *policy;
 494
 495         /* append current policy with the new rules */
 496         first = (&ima_temp_rules)->next;
 497         last = (&ima_temp_rules)->prev;
 498         policy = &ima_policy_rules;
 499
 500         synchronize_rcu();
 501
 502         last->next = policy;
 503         rcu_assign_pointer(list_next_rcu(policy->prev), first);
 504         first->prev = policy->prev;
 505         policy->prev = last;
 506
 507         /* prepare for the next policy rules addition */
 508         INIT_LIST_HEAD(&ima_temp_rules);
 509
 510         if (ima_rules != policy) {
 511                 ima_policy_flag = 0;
 512                 ima_rules = policy;
 513         }
 514         ima_update_policy_flag();
 515 }
 516
 517 enum {
 518         Opt_err = -1,
 519         Opt_measure = 1, Opt_dont_measure,
 520         Opt_appraise, Opt_dont_appraise,
 521         Opt_audit,
 522         Opt_obj_user, Opt_obj_role, Opt_obj_type,
 523         Opt_subj_user, Opt_subj_role, Opt_subj_type,
 524         Opt_func, Opt_mask, Opt_fsmagic,
 525         Opt_fsuuid, Opt_uid_eq, Opt_euid_eq, Opt_fowner_eq,
 526         Opt_uid_gt, Opt_euid_gt, Opt_fowner_gt,
 527         Opt_uid_lt, Opt_euid_lt, Opt_fowner_lt,
 528         Opt_appraise_type, Opt_permit_directio,
 529         Opt_pcr
 530 };
 531
 532 static match_table_t policy_tokens = {
 533         {Opt_measure, "measure"},
 534         {Opt_dont_measure, "dont_measure"},
 535         {Opt_appraise, "appraise"},
 536         {Opt_dont_appraise, "dont_appraise"},
 537         {Opt_audit, "audit"},
 538         {Opt_obj_user, "obj_user=%s"},
 539         {Opt_obj_role, "obj_role=%s"},
 540         {Opt_obj_type, "obj_type=%s"},
 541         {Opt_subj_user, "subj_user=%s"},
 542         {Opt_subj_role, "subj_role=%s"},
 543         {Opt_subj_type, "subj_type=%s"},
 544         {Opt_func, "func=%s"},
 545         {Opt_mask, "mask=%s"},
 546         {Opt_fsmagic, "fsmagic=%s"},
 547         {Opt_fsuuid, "fsuuid=%s"},
 548         {Opt_uid_eq, "uid=%s"},
 549         {Opt_euid_eq, "euid=%s"},
 550         {Opt_fowner_eq, "fowner=%s"},
 551         {Opt_uid_gt, "uid>%s"},
 552         {Opt_euid_gt, "euid>%s"},
 553         {Opt_fowner_gt, "fowner>%s"},
 554         {Opt_uid_lt, "uid<%s"},
 555         {Opt_euid_lt, "euid<%s"},
 556         {Opt_fowner_lt, "fowner<%s"},
 557         {Opt_appraise_type, "appraise_type=%s"},
 558         {Opt_permit_directio, "permit_directio"},
 559         {Opt_pcr, "pcr=%s"},
 560         {Opt_err, NULL}
 561 };
 562
 563 static int ima_lsm_rule_init(struct ima_rule_entry *entry,
 564                              substring_t *args, int lsm_rule, int audit_type)
 565 {
 566         int result;
 567
 568         if (entry->lsm[lsm_rule].rule)
 569                 return -EINVAL;
 570
 571         entry->lsm[lsm_rule].args_p = match_strdup(args);
 572         if (!entry->lsm[lsm_rule].args_p)
 573                 return -ENOMEM;
 574
 575         entry->lsm[lsm_rule].type = audit_type;
 576         result = security_filter_rule_init(entry->lsm[lsm_rule].type,
 577                                            Audit_equal,
 578                                            entry->lsm[lsm_rule].args_p,
 579                                            &entry->lsm[lsm_rule].rule);
 580         if (!entry->lsm[lsm_rule].rule) {
 581                 kfree(entry->lsm[lsm_rule].args_p);
 582                 return -EINVAL;
 583         }
 584
 585         return result;
 586 }
 587
 588 static void ima_log_string_op(struct audit_buffer *ab, char *key, char *value,
 589                               bool (*rule_operator)(kuid_t, kuid_t))
 590 {
 591         if (rule_operator == &uid_gt)
 592                 audit_log_format(ab, "%s>", key);
 593         else if (rule_operator == &uid_lt)
 594                 audit_log_format(ab, "%s<", key);
 595         else
 596                 audit_log_format(ab, "%s=", key);
 597         audit_log_untrustedstring(ab, value);
 598         audit_log_format(ab, " ");
 599 }
 600 static void ima_log_string(struct audit_buffer *ab, char *key, char *value)
 601 {
 602         ima_log_string_op(ab, key, value, NULL);
 603 }
 604
 605 static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
 606 {
 607         struct audit_buffer *ab;
 608         char *from;
 609         char *p;
 610         bool uid_token;
 611         int result = 0;
 612
 613         ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_INTEGRITY_RULE);
 614
 615         entry->uid = INVALID_UID;
 616         entry->fowner = INVALID_UID;
 617         entry->uid_op = &uid_eq;
 618         entry->fowner_op = &uid_eq;
 619         entry->action = UNKNOWN;
 620         while ((p = strsep(&rule, " \t")) != NULL) {
 621                 substring_t args[MAX_OPT_ARGS];
 622                 int token;
 623                 unsigned long lnum;
 624
 625                 if (result < 0)
 626                         break;
 627                 if ((*p == '\0') || (*p == ' ') || (*p == '\t'))
 628                         continue;
 629                 token = match_token(p, policy_tokens, args);
 630                 switch (token) {
 631                 case Opt_measure:
 632                         ima_log_string(ab, "action", "measure");
 633
 634                         if (entry->action != UNKNOWN)
 635                                 result = -EINVAL;
 636
 637                         entry->action = MEASURE;
 638                         break;
 639                 case Opt_dont_measure:
 640                         ima_log_string(ab, "action", "dont_measure");
 641
 642                         if (entry->action != UNKNOWN)
 643                                 result = -EINVAL;
 644
 645                         entry->action = DONT_MEASURE;
 646                         break;
 647                 case Opt_appraise:
 648                         ima_log_string(ab, "action", "appraise");
 649
 650                         if (entry->action != UNKNOWN)
 651                                 result = -EINVAL;
 652
 653                         entry->action = APPRAISE;
 654                         break;
 655                 case Opt_dont_appraise:
 656                         ima_log_string(ab, "action", "dont_appraise");
 657
 658                         if (entry->action != UNKNOWN)
 659                                 result = -EINVAL;
 660
 661                         entry->action = DONT_APPRAISE;
 662                         break;
 663                 case Opt_audit:
 664                         ima_log_string(ab, "action", "audit");
 665
 666                         if (entry->action != UNKNOWN)
 667                                 result = -EINVAL;
 668
 669                         entry->action = AUDIT;
 670                         break;
 671                 case Opt_func:
 672                         ima_log_string(ab, "func", args[0].from);
 673
 674                         if (entry->func)
 675                                 result = -EINVAL;
 676
 677                         if (strcmp(args[0].from, "FILE_CHECK") == 0)
 678                                 entry->func = FILE_CHECK;
 679                         /* PATH_CHECK is for backwards compat */
 680                         else if (strcmp(args[0].from, "PATH_CHECK") == 0)
 681                                 entry->func = FILE_CHECK;
 682                         else if (strcmp(args[0].from, "MODULE_CHECK") == 0)
 683                                 entry->func = MODULE_CHECK;
 684                         else if (strcmp(args[0].from, "FIRMWARE_CHECK") == 0)
 685                                 entry->func = FIRMWARE_CHECK;
 686                         else if ((strcmp(args[0].from, "FILE_MMAP") == 0)
 687                                 || (strcmp(args[0].from, "MMAP_CHECK") == 0))
 688                                 entry->func = MMAP_CHECK;
 689                         else if (strcmp(args[0].from, "BPRM_CHECK") == 0)
 690                                 entry->func = BPRM_CHECK;
 691                         else if (strcmp(args[0].from, "KEXEC_KERNEL_CHECK") ==
 692                                  0)
 693                                 entry->func = KEXEC_KERNEL_CHECK;
 694                         else if (strcmp(args[0].from, "KEXEC_INITRAMFS_CHECK")
 695                                  == 0)
 696                                 entry->func = KEXEC_INITRAMFS_CHECK;
 697                         else if (strcmp(args[0].from, "POLICY_CHECK") == 0)
 698                                 entry->func = POLICY_CHECK;
 699                         else
 700                                 result = -EINVAL;
 701                         if (!result)
 702                                 entry->flags |= IMA_FUNC;
 703                         break;
 704                 case Opt_mask:
 705                         ima_log_string(ab, "mask", args[0].from);
 706
 707                         if (entry->mask)
 708                                 result = -EINVAL;
 709
 710                         from = args[0].from;
 711                         if (*from == '^')
 712                                 from++;
 713
 714                         if ((strcmp(from, "MAY_EXEC")) == 0)
 715                                 entry->mask = MAY_EXEC;
 716                         else if (strcmp(from, "MAY_WRITE") == 0)
 717                                 entry->mask = MAY_WRITE;
 718                         else if (strcmp(from, "MAY_READ") == 0)
 719                                 entry->mask = MAY_READ;
 720                         else if (strcmp(from, "MAY_APPEND") == 0)
 721                                 entry->mask = MAY_APPEND;
 722                         else
 723                                 result = -EINVAL;
 724                         if (!result)
 725                                 entry->flags |= (*args[0].from == '^')
 726                                      ? IMA_INMASK : IMA_MASK;
 727                         break;
 728                 case Opt_fsmagic:
 729                         ima_log_string(ab, "fsmagic", args[0].from);
 730
 731                         if (entry->fsmagic) {
 732                                 result = -EINVAL;
 733                                 break;
 734                         }
 735
 736                         result = kstrtoul(args[0].from, 16, &entry->fsmagic);
 737                         if (!result)
 738                                 entry->flags |= IMA_FSMAGIC;
 739                         break;
 740                 case Opt_fsuuid:
 741                         ima_log_string(ab, "fsuuid", args[0].from);
 742
 743                         if (memchr_inv(entry->fsuuid, 0x00,
 744                                        sizeof(entry->fsuuid))) {
 745                                 result = -EINVAL;
 746                                 break;
 747                         }
 748
 749                         result = blk_part_pack_uuid(args[0].from,
 750                                                     entry->fsuuid);
 751                         if (!result)
 752                                 entry->flags |= IMA_FSUUID;
 753                         break;
 754                 case Opt_uid_gt:
 755                 case Opt_euid_gt:
 756                         entry->uid_op = &uid_gt;
 757                 case Opt_uid_lt:
 758                 case Opt_euid_lt:
 759                         if ((token == Opt_uid_lt) || (token == Opt_euid_lt))
 760                                 entry->uid_op = &uid_lt;
 761                 case Opt_uid_eq:
 762                 case Opt_euid_eq:
 763                         uid_token = (token == Opt_uid_eq) ||
 764                                     (token == Opt_uid_gt) ||
 765                                     (token == Opt_uid_lt);
 766
 767                         ima_log_string_op(ab, uid_token ? "uid" : "euid",
 768                                           args[0].from, entry->uid_op);
 769
 770                         if (uid_valid(entry->uid)) {
 771                                 result = -EINVAL;
 772                                 break;
 773                         }
 774
 775                         result = kstrtoul(args[0].from, 10, &lnum);
 776                         if (!result) {
 777                                 entry->uid = make_kuid(current_user_ns(),
 778                                                        (uid_t) lnum);
 779                                 if (!uid_valid(entry->uid) ||
 780                                     (uid_t)lnum != lnum)
 781                                         result = -EINVAL;
 782                                 else
 783                                         entry->flags |= uid_token
 784                                             ? IMA_UID : IMA_EUID;
 785                         }
 786                         break;
 787                 case Opt_fowner_gt:
 788                         entry->fowner_op = &uid_gt;
 789                 case Opt_fowner_lt:
 790                         if (token == Opt_fowner_lt)
 791                                 entry->fowner_op = &uid_lt;
 792                 case Opt_fowner_eq:
 793                         ima_log_string_op(ab, "fowner", args[0].from,
 794                                           entry->fowner_op);
 795
 796                         if (uid_valid(entry->fowner)) {
 797                                 result = -EINVAL;
 798                                 break;
 799                         }
 800
 801                         result = kstrtoul(args[0].from, 10, &lnum);
 802                         if (!result) {
 803                                 entry->fowner = make_kuid(current_user_ns(), (uid_t)lnum);
 804                                 if (!uid_valid(entry->fowner) || (((uid_t)lnum) != lnum))
 805                                         result = -EINVAL;
 806                                 else
 807                                         entry->flags |= IMA_FOWNER;
 808                         }
 809                         break;
 810                 case Opt_obj_user:
 811                         ima_log_string(ab, "obj_user", args[0].from);
 812                         result = ima_lsm_rule_init(entry, args,
 813                                                    LSM_OBJ_USER,
 814                                                    AUDIT_OBJ_USER);
 815                         break;
 816                 case Opt_obj_role:
 817                         ima_log_string(ab, "obj_role", args[0].from);
 818                         result = ima_lsm_rule_init(entry, args,
 819                                                    LSM_OBJ_ROLE,
 820                                                    AUDIT_OBJ_ROLE);
 821                         break;
 822                 case Opt_obj_type:
 823                         ima_log_string(ab, "obj_type", args[0].from);
 824                         result = ima_lsm_rule_init(entry, args,
 825                                                    LSM_OBJ_TYPE,
 826                                                    AUDIT_OBJ_TYPE);
 827                         break;
 828                 case Opt_subj_user:
 829                         ima_log_string(ab, "subj_user", args[0].from);
 830                         result = ima_lsm_rule_init(entry, args,
 831                                                    LSM_SUBJ_USER,
 832                                                    AUDIT_SUBJ_USER);
 833                         break;
 834                 case Opt_subj_role:
 835                         ima_log_string(ab, "subj_role", args[0].from);
 836                         result = ima_lsm_rule_init(entry, args,
 837                                                    LSM_SUBJ_ROLE,
 838                                                    AUDIT_SUBJ_ROLE);
 839                         break;
 840                 case Opt_subj_type:
 841                         ima_log_string(ab, "subj_type", args[0].from);
 842                         result = ima_lsm_rule_init(entry, args,
 843                                                    LSM_SUBJ_TYPE,
 844                                                    AUDIT_SUBJ_TYPE);
 845                         break;
 846                 case Opt_appraise_type:
 847                         if (entry->action != APPRAISE) {
 848                                 result = -EINVAL;
 849                                 break;
 850                         }
 851
 852                         ima_log_string(ab, "appraise_type", args[0].from);
 853                         if ((strcmp(args[0].from, "imasig")) == 0)
 854                                 entry->flags |= IMA_DIGSIG_REQUIRED;
 855                         else
 856                                 result = -EINVAL;
 857                         break;
 858                 case Opt_permit_directio:
 859                         entry->flags |= IMA_PERMIT_DIRECTIO;
 860                         break;
 861                 case Opt_pcr:
 862                         if (entry->action != MEASURE) {
 863                                 result = -EINVAL;
 864                                 break;
 865                         }
 866                         ima_log_string(ab, "pcr", args[0].from);
 867
 868                         result = kstrtoint(args[0].from, 10, &entry->pcr);
 869                         if (result || INVALID_PCR(entry->pcr))
 870                                 result = -EINVAL;
 871                         else
 872                                 entry->flags |= IMA_PCR;
 873
 874                         break;
 875                 case Opt_err:
 876                         ima_log_string(ab, "UNKNOWN", p);
 877                         result = -EINVAL;
 878                         break;
 879                 }
 880         }
 881         if (!result && (entry->action == UNKNOWN))
 882                 result = -EINVAL;
 883         else if (entry->func == MODULE_CHECK)
 884                 temp_ima_appraise |= IMA_APPRAISE_MODULES;
 885         else if (entry->func == FIRMWARE_CHECK)
 886                 temp_ima_appraise |= IMA_APPRAISE_FIRMWARE;
 887         else if (entry->func == POLICY_CHECK)
 888                 temp_ima_appraise |= IMA_APPRAISE_POLICY;
 889         audit_log_format(ab, "res=%d", !result);
 890         audit_log_end(ab);
 891         return result;
 892 }
 893
 894 /**
 895  * ima_parse_add_rule - add a rule to ima_policy_rules
 896  * @rule - ima measurement policy rule
 897  *
 898  * Avoid locking by allowing just one writer at a time in ima_write_policy()
 899  * Returns the length of the rule parsed, an error code on failure
 900  */
 901 ssize_t ima_parse_add_rule(char *rule)
 902 {
 903         static const char op[] = "update_policy";
 904         char *p;
 905         struct ima_rule_entry *entry;
 906         ssize_t result, len;
 907         int audit_info = 0;
 908
 909         p = strsep(&rule, "\n");
 910         len = strlen(p) + 1;
 911         p += strspn(p, " \t");
 912
 913         if (*p == '#' || *p == '\0')
 914                 return len;
 915
 916         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 917         if (!entry) {
 918                 integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
 919                                     NULL, op, "-ENOMEM", -ENOMEM, audit_info);
 920                 return -ENOMEM;
 921         }
 922
 923         INIT_LIST_HEAD(&entry->list);
 924
 925         result = ima_parse_rule(p, entry);
 926         if (result) {
 927                 kfree(entry);
 928                 integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
 929                                     NULL, op, "invalid-policy", result,
 930                                     audit_info);
 931                 return result;
 932         }
 933
 934         list_add_tail(&entry->list, &ima_temp_rules);
 935
 936         return len;
 937 }
 938
 939 /**
 940  * ima_delete_rules() called to cleanup invalid in-flight policy.
 941  * We don't need locking as we operate on the temp list, which is
 942  * different from the active one.  There is also only one user of
 943  * ima_delete_rules() at a time.
 944  */
 945 void ima_delete_rules(void)
 946 {
 947         struct ima_rule_entry *entry, *tmp;
 948         int i;
 949
 950         temp_ima_appraise = 0;
 951         list_for_each_entry_safe(entry, tmp, &ima_temp_rules, list) {
 952                 for (i = 0; i < MAX_LSM_RULES; i++)
 953                         kfree(entry->lsm[i].args_p);
 954
 955                 list_del(&entry->list);
 956                 kfree(entry);
 957         }
 958 }
 959
 960 #ifdef  CONFIG_IMA_READ_POLICY
 961 enum {
 962         mask_exec = 0, mask_write, mask_read, mask_append
 963 };
 964
 965 static char *mask_tokens[] = {
 966         "MAY_EXEC",
 967         "MAY_WRITE",
 968         "MAY_READ",
 969         "MAY_APPEND"
 970 };
 971
 972 enum {
 973         func_file = 0, func_mmap, func_bprm,
 974         func_module, func_firmware, func_post,
 975         func_kexec_kernel, func_kexec_initramfs,
 976         func_policy
 977 };
 978
 979 static char *func_tokens[] = {
 980         "FILE_CHECK",
 981         "MMAP_CHECK",
 982         "BPRM_CHECK",
 983         "MODULE_CHECK",
 984         "FIRMWARE_CHECK",
 985         "POST_SETATTR",
 986         "KEXEC_KERNEL_CHECK",
 987         "KEXEC_INITRAMFS_CHECK",
 988         "POLICY_CHECK"
 989 };
 990
 991 void *ima_policy_start(struct seq_file *m, loff_t *pos)
 992 {
 993         loff_t l = *pos;
 994         struct ima_rule_entry *entry;
 995
 996         rcu_read_lock();
 997         list_for_each_entry_rcu(entry, ima_rules, list) {
 998                 if (!l--) {
 999                         rcu_read_unlock();
1000                         return entry;
1001                 }
1002         }
1003         rcu_read_unlock();
1004         return NULL;
1005 }
1006
1007 void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos)
1008 {
1009         struct ima_rule_entry *entry = v;
1010
1011         rcu_read_lock();
1012         entry = list_entry_rcu(entry->list.next, struct ima_rule_entry, list);
1013         rcu_read_unlock();
1014         (*pos)++;
1015
1016         return (&entry->list == ima_rules) ? NULL : entry;
1017 }
1018
1019 void ima_policy_stop(struct seq_file *m, void *v)
1020 {
1021 }
1022
1023 #define pt(token)       policy_tokens[token + Opt_err].pattern
1024 #define mt(token)       mask_tokens[token]
1025 #define ft(token)       func_tokens[token]
1026
1027 /*
1028  * policy_func_show - display the ima_hooks policy rule
1029  */
1030 static void policy_func_show(struct seq_file *m, enum ima_hooks func)
1031 {
1032         char tbuf[64] = {0,};
1033
1034         switch (func) {
1035         case FILE_CHECK:
1036                 seq_printf(m, pt(Opt_func), ft(func_file));
1037                 break;
1038         case MMAP_CHECK:
1039                 seq_printf(m, pt(Opt_func), ft(func_mmap));
1040                 break;
1041         case BPRM_CHECK:
1042                 seq_printf(m, pt(Opt_func), ft(func_bprm));
1043                 break;
1044         case MODULE_CHECK:
1045                 seq_printf(m, pt(Opt_func), ft(func_module));
1046                 break;
1047         case FIRMWARE_CHECK:
1048                 seq_printf(m, pt(Opt_func), ft(func_firmware));
1049                 break;
1050         case POST_SETATTR:
1051                 seq_printf(m, pt(Opt_func), ft(func_post));
1052                 break;
1053         case KEXEC_KERNEL_CHECK:
1054                 seq_printf(m, pt(Opt_func), ft(func_kexec_kernel));
1055                 break;
1056         case KEXEC_INITRAMFS_CHECK:
1057                 seq_printf(m, pt(Opt_func), ft(func_kexec_initramfs));
1058                 break;
1059         case POLICY_CHECK:
1060                 seq_printf(m, pt(Opt_func), ft(func_policy));
1061                 break;
1062         default:
1063                 snprintf(tbuf, sizeof(tbuf), "%d", func);
1064                 seq_printf(m, pt(Opt_func), tbuf);
1065                 break;
1066         }
1067         seq_puts(m, " ");
1068 }
1069
1070 int ima_policy_show(struct seq_file *m, void *v)
1071 {
1072         struct ima_rule_entry *entry = v;
1073         int i;
1074         char tbuf[64] = {0,};
1075
1076         rcu_read_lock();
1077
1078         if (entry->action & MEASURE)
1079                 seq_puts(m, pt(Opt_measure));
1080         if (entry->action & DONT_MEASURE)
1081                 seq_puts(m, pt(Opt_dont_measure));
1082         if (entry->action & APPRAISE)
1083                 seq_puts(m, pt(Opt_appraise));
1084         if (entry->action & DONT_APPRAISE)
1085                 seq_puts(m, pt(Opt_dont_appraise));
1086         if (entry->action & AUDIT)
1087                 seq_puts(m, pt(Opt_audit));
1088
1089         seq_puts(m, " ");
1090
1091         if (entry->flags & IMA_FUNC)
1092                 policy_func_show(m, entry->func);
1093
1094         if (entry->flags & IMA_MASK) {
1095                 if (entry->mask & MAY_EXEC)
1096                         seq_printf(m, pt(Opt_mask), mt(mask_exec));
1097                 if (entry->mask & MAY_WRITE)
1098                         seq_printf(m, pt(Opt_mask), mt(mask_write));
1099                 if (entry->mask & MAY_READ)
1100                         seq_printf(m, pt(Opt_mask), mt(mask_read));
1101                 if (entry->mask & MAY_APPEND)
1102                         seq_printf(m, pt(Opt_mask), mt(mask_append));
1103                 seq_puts(m, " ");
1104         }
1105
1106         if (entry->flags & IMA_FSMAGIC) {
1107                 snprintf(tbuf, sizeof(tbuf), "0x%lx", entry->fsmagic);
1108                 seq_printf(m, pt(Opt_fsmagic), tbuf);
1109                 seq_puts(m, " ");
1110         }
1111
1112         if (entry->flags & IMA_PCR) {
1113                 snprintf(tbuf, sizeof(tbuf), "%d", entry->pcr);
1114                 seq_printf(m, pt(Opt_pcr), tbuf);
1115                 seq_puts(m, " ");
1116         }
1117
1118         if (entry->flags & IMA_FSUUID) {
1119                 seq_printf(m, "fsuuid=%pU", entry->fsuuid);
1120                 seq_puts(m, " ");
1121         }
1122
1123         if (entry->flags & IMA_UID) {
1124                 snprintf(tbuf, sizeof(tbuf), "%d", __kuid_val(entry->uid));
1125                 if (entry->uid_op == &uid_gt)
1126                         seq_printf(m, pt(Opt_uid_gt), tbuf);
1127                 else if (entry->uid_op == &uid_lt)
1128                         seq_printf(m, pt(Opt_uid_lt), tbuf);
1129                 else
1130                         seq_printf(m, pt(Opt_uid_eq), tbuf);
1131                 seq_puts(m, " ");
1132         }
1133
1134         if (entry->flags & IMA_EUID) {
1135                 snprintf(tbuf, sizeof(tbuf), "%d", __kuid_val(entry->uid));
1136                 if (entry->uid_op == &uid_gt)
1137                         seq_printf(m, pt(Opt_euid_gt), tbuf);
1138                 else if (entry->uid_op == &uid_lt)
1139                         seq_printf(m, pt(Opt_euid_lt), tbuf);
1140                 else
1141                         seq_printf(m, pt(Opt_euid_eq), tbuf);
1142                 seq_puts(m, " ");
1143         }
1144
1145         if (entry->flags & IMA_FOWNER) {
1146                 snprintf(tbuf, sizeof(tbuf), "%d", __kuid_val(entry->fowner));
1147                 if (entry->fowner_op == &uid_gt)
1148                         seq_printf(m, pt(Opt_fowner_gt), tbuf);
1149                 else if (entry->fowner_op == &uid_lt)
1150                         seq_printf(m, pt(Opt_fowner_lt), tbuf);
1151                 else
1152                         seq_printf(m, pt(Opt_fowner_eq), tbuf);
1153                 seq_puts(m, " ");
1154         }
1155
1156         for (i = 0; i < MAX_LSM_RULES; i++) {
1157                 if (entry->lsm[i].rule) {
1158                         switch (i) {
1159                         case LSM_OBJ_USER:
1160                                 seq_printf(m, pt(Opt_obj_user),
1161                                            (char *)entry->lsm[i].args_p);
1162                                 break;
1163                         case LSM_OBJ_ROLE:
1164                                 seq_printf(m, pt(Opt_obj_role),
1165                                            (char *)entry->lsm[i].args_p);
1166                                 break;
1167                         case LSM_OBJ_TYPE:
1168                                 seq_printf(m, pt(Opt_obj_type),
1169                                            (char *)entry->lsm[i].args_p);
1170                                 break;
1171                         case LSM_SUBJ_USER:
1172                                 seq_printf(m, pt(Opt_subj_user),
1173                                            (char *)entry->lsm[i].args_p);
1174                                 break;
1175                         case LSM_SUBJ_ROLE:
1176                                 seq_printf(m, pt(Opt_subj_role),
1177                                            (char *)entry->lsm[i].args_p);
1178                                 break;
1179                         case LSM_SUBJ_TYPE:
1180                                 seq_printf(m, pt(Opt_subj_type),
1181                                            (char *)entry->lsm[i].args_p);
1182                                 break;
1183                         }
1184                 }
1185         }
1186         if (entry->flags & IMA_DIGSIG_REQUIRED)
1187                 seq_puts(m, "appraise_type=imasig ");
1188         if (entry->flags & IMA_PERMIT_DIRECTIO)
1189                 seq_puts(m, "permit_directio ");
1190         rcu_read_unlock();
1191         seq_puts(m, "\n");
1192         return 0;
1193 }
1194 #endif  /* CONFIG_IMA_READ_POLICY */