kernel/auditsc.c

   1 /* auditsc.c -- System-call auditing support
   2  * Handles all system-call specific auditing features.
   3  *
   4  * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
   5  * Copyright 2005 Hewlett-Packard Development Company, L.P.
   6  * Copyright (C) 2005, 2006 IBM Corporation
   7  * All Rights Reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  * Written by Rickard E. (Rik) Faith <faith@redhat.com>
  24  *
  25  * Many of the ideas implemented here are from Stephen C. Tweedie,
  26  * especially the idea of avoiding a copy by using getname.
  27  *
  28  * The method for actual interception of syscall entry and exit (not in
  29  * this file -- see entry.S) is based on a GPL'd patch written by
  30  * okir@suse.de and Copyright 2003 SuSE Linux AG.
  31  *
  32  * POSIX message queue support added by George Wilson <ltcgcw@us.ibm.com>,
  33  * 2006.
  34  *
  35  * The support of additional filter rules compares (>, <, >=, <=) was
  36  * added by Dustin Kirkland <dustin.kirkland@us.ibm.com>, 2005.
  37  *
  38  * Modified by Amy Griffis <amy.griffis@hp.com> to collect additional
  39  * filesystem information.
  40  *
  41  * Subject and object context labeling support added by <danjones@us.ibm.com>
  42  * and <dustin.kirkland@us.ibm.com> for LSPP certification compliance.
  43  */
  44
  45 #include <linux/init.h>
  46 #include <asm/types.h>
  47 #include <linux/atomic.h>
  48 #include <linux/fs.h>
  49 #include <linux/namei.h>
  50 #include <linux/mm.h>
  51 #include <linux/export.h>
  52 #include <linux/slab.h>
  53 #include <linux/mount.h>
  54 #include <linux/socket.h>
  55 #include <linux/mqueue.h>
  56 #include <linux/audit.h>
  57 #include <linux/personality.h>
  58 #include <linux/time.h>
  59 #include <linux/netlink.h>
  60 #include <linux/compiler.h>
  61 #include <asm/unistd.h>
  62 #include <linux/security.h>
  63 #include <linux/list.h>
  64 #include <linux/tty.h>
  65 #include <linux/binfmts.h>
  66 #include <linux/highmem.h>
  67 #include <linux/syscalls.h>
  68 #include <linux/capability.h>
  69 #include <linux/fs_struct.h>
  70 #include <linux/compat.h>
  71
  72 #include "audit.h"
  73
  74 /* flags stating the success for a syscall */
  75 #define AUDITSC_INVALID 0
  76 #define AUDITSC_SUCCESS 1
  77 #define AUDITSC_FAILURE 2
  78
  79 /* no execve audit message should be longer than this (userspace limits) */
  80 #define MAX_EXECVE_AUDIT_LEN 7500
  81
  82 /* number of audit rules */
  83 int audit_n_rules;
  84
  85 /* determines whether we collect data for signals sent */
  86 int audit_signals;
  87
  88 struct audit_aux_data {
  89         struct audit_aux_data   *next;
  90         int                     type;
  91 };
  92
  93 #define AUDIT_AUX_IPCPERM       0
  94
  95 /* Number of target pids per aux struct. */
  96 #define AUDIT_AUX_PIDS  16
  97
  98 struct audit_aux_data_execve {
  99         struct audit_aux_data   d;
 100         int argc;
 101         int envc;
 102         struct mm_struct *mm;
 103 };
 104
 105 struct audit_aux_data_pids {
 106         struct audit_aux_data   d;
 107         pid_t                   target_pid[AUDIT_AUX_PIDS];
 108         kuid_t                  target_auid[AUDIT_AUX_PIDS];
 109         kuid_t                  target_uid[AUDIT_AUX_PIDS];
 110         unsigned int            target_sessionid[AUDIT_AUX_PIDS];
 111         u32                     target_sid[AUDIT_AUX_PIDS];
 112         char                    target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN];
 113         int                     pid_count;
 114 };
 115
 116 struct audit_aux_data_bprm_fcaps {
 117         struct audit_aux_data   d;
 118         struct audit_cap_data   fcap;
 119         unsigned int            fcap_ver;
 120         struct audit_cap_data   old_pcap;
 121         struct audit_cap_data   new_pcap;
 122 };
 123
 124 struct audit_aux_data_capset {
 125         struct audit_aux_data   d;
 126         pid_t                   pid;
 127         struct audit_cap_data   cap;
 128 };
 129
 130 struct audit_tree_refs {
 131         struct audit_tree_refs *next;
 132         struct audit_chunk *c[31];
 133 };
 134
 135 static inline int open_arg(int flags, int mask)
 136 {
 137         int n = ACC_MODE(flags);
 138         if (flags & (O_TRUNC | O_CREAT))
 139                 n |= AUDIT_PERM_WRITE;
 140         return n & mask;
 141 }
 142
 143 static int audit_match_perm(struct audit_context *ctx, int mask)
 144 {
 145         unsigned n;
 146         if (unlikely(!ctx))
 147                 return 0;
 148         n = ctx->major;
 149
 150         switch (audit_classify_syscall(ctx->arch, n)) {
 151         case 0: /* native */
 152                 if ((mask & AUDIT_PERM_WRITE) &&
 153                      audit_match_class(AUDIT_CLASS_WRITE, n))
 154                         return 1;
 155                 if ((mask & AUDIT_PERM_READ) &&
 156                      audit_match_class(AUDIT_CLASS_READ, n))
 157                         return 1;
 158                 if ((mask & AUDIT_PERM_ATTR) &&
 159                      audit_match_class(AUDIT_CLASS_CHATTR, n))
 160                         return 1;
 161                 return 0;
 162         case 1: /* 32bit on biarch */
 163                 if ((mask & AUDIT_PERM_WRITE) &&
 164                      audit_match_class(AUDIT_CLASS_WRITE_32, n))
 165                         return 1;
 166                 if ((mask & AUDIT_PERM_READ) &&
 167                      audit_match_class(AUDIT_CLASS_READ_32, n))
 168                         return 1;
 169                 if ((mask & AUDIT_PERM_ATTR) &&
 170                      audit_match_class(AUDIT_CLASS_CHATTR_32, n))
 171                         return 1;
 172                 return 0;
 173         case 2: /* open */
 174                 return mask & ACC_MODE(ctx->argv[1]);
 175         case 3: /* openat */
 176                 return mask & ACC_MODE(ctx->argv[2]);
 177         case 4: /* socketcall */
 178                 return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND);
 179         case 5: /* execve */
 180                 return mask & AUDIT_PERM_EXEC;
 181         default:
 182                 return 0;
 183         }
 184 }
 185
 186 static int audit_match_filetype(struct audit_context *ctx, int val)
 187 {
 188         struct audit_names *n;
 189         umode_t mode = (umode_t)val;
 190
 191         if (unlikely(!ctx))
 192                 return 0;
 193
 194         list_for_each_entry(n, &ctx->names_list, list) {
 195                 if ((n->ino != -1) &&
 196                     ((n->mode & S_IFMT) == mode))
 197                         return 1;
 198         }
 199
 200         return 0;
 201 }
 202
 203 /*
 204  * We keep a linked list of fixed-sized (31 pointer) arrays of audit_chunk *;
 205  * ->first_trees points to its beginning, ->trees - to the current end of data.
 206  * ->tree_count is the number of free entries in array pointed to by ->trees.
 207  * Original condition is (NULL, NULL, 0); as soon as it grows we never revert to NULL,
 208  * "empty" becomes (p, p, 31) afterwards.  We don't shrink the list (and seriously,
 209  * it's going to remain 1-element for almost any setup) until we free context itself.
 210  * References in it _are_ dropped - at the same time we free/drop aux stuff.
 211  */
 212
 213 #ifdef CONFIG_AUDIT_TREE
 214 static void audit_set_auditable(struct audit_context *ctx)
 215 {
 216         if (!ctx->prio) {
 217                 ctx->prio = 1;
 218                 ctx->current_state = AUDIT_RECORD_CONTEXT;
 219         }
 220 }
 221
 222 static int put_tree_ref(struct audit_context *ctx, struct audit_chunk *chunk)
 223 {
 224         struct audit_tree_refs *p = ctx->trees;
 225         int left = ctx->tree_count;
 226         if (likely(left)) {
 227                 p->c[--left] = chunk;
 228                 ctx->tree_count = left;
 229                 return 1;
 230         }
 231         if (!p)
 232                 return 0;
 233         p = p->next;
 234         if (p) {
 235                 p->c[30] = chunk;
 236                 ctx->trees = p;
 237                 ctx->tree_count = 30;
 238                 return 1;
 239         }
 240         return 0;
 241 }
 242
 243 static int grow_tree_refs(struct audit_context *ctx)
 244 {
 245         struct audit_tree_refs *p = ctx->trees;
 246         ctx->trees = kzalloc(sizeof(struct audit_tree_refs), GFP_KERNEL);
 247         if (!ctx->trees) {
 248                 ctx->trees = p;
 249                 return 0;
 250         }
 251         if (p)
 252                 p->next = ctx->trees;
 253         else
 254                 ctx->first_trees = ctx->trees;
 255         ctx->tree_count = 31;
 256         return 1;
 257 }
 258 #endif
 259
 260 static void unroll_tree_refs(struct audit_context *ctx,
 261                       struct audit_tree_refs *p, int count)
 262 {
 263 #ifdef CONFIG_AUDIT_TREE
 264         struct audit_tree_refs *q;
 265         int n;
 266         if (!p) {
 267                 /* we started with empty chain */
 268                 p = ctx->first_trees;
 269                 count = 31;
 270                 /* if the very first allocation has failed, nothing to do */
 271                 if (!p)
 272                         return;
 273         }
 274         n = count;
 275         for (q = p; q != ctx->trees; q = q->next, n = 31) {
 276                 while (n--) {
 277                         audit_put_chunk(q->c[n]);
 278                         q->c[n] = NULL;
 279                 }
 280         }
 281         while (n-- > ctx->tree_count) {
 282                 audit_put_chunk(q->c[n]);
 283                 q->c[n] = NULL;
 284         }
 285         ctx->trees = p;
 286         ctx->tree_count = count;
 287 #endif
 288 }
 289
 290 static void free_tree_refs(struct audit_context *ctx)
 291 {
 292         struct audit_tree_refs *p, *q;
 293         for (p = ctx->first_trees; p; p = q) {
 294                 q = p->next;
 295                 kfree(p);
 296         }
 297 }
 298
 299 static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
 300 {
 301 #ifdef CONFIG_AUDIT_TREE
 302         struct audit_tree_refs *p;
 303         int n;
 304         if (!tree)
 305                 return 0;
 306         /* full ones */
 307         for (p = ctx->first_trees; p != ctx->trees; p = p->next) {
 308                 for (n = 0; n < 31; n++)
 309                         if (audit_tree_match(p->c[n], tree))
 310                                 return 1;
 311         }
 312         /* partial */
 313         if (p) {
 314                 for (n = ctx->tree_count; n < 31; n++)
 315                         if (audit_tree_match(p->c[n], tree))
 316                                 return 1;
 317         }
 318 #endif
 319         return 0;
 320 }
 321
 322 static int audit_compare_uid(kuid_t uid,
 323                              struct audit_names *name,
 324                              struct audit_field *f,
 325                              struct audit_context *ctx)
 326 {
 327         struct audit_names *n;
 328         int rc;
 329
 330         if (name) {
 331                 rc = audit_uid_comparator(uid, f->op, name->uid);
 332                 if (rc)
 333                         return rc;
 334         }
 335
 336         if (ctx) {
 337                 list_for_each_entry(n, &ctx->names_list, list) {
 338                         rc = audit_uid_comparator(uid, f->op, n->uid);
 339                         if (rc)
 340                                 return rc;
 341                 }
 342         }
 343         return 0;
 344 }
 345
 346 static int audit_compare_gid(kgid_t gid,
 347                              struct audit_names *name,
 348                              struct audit_field *f,
 349                              struct audit_context *ctx)
 350 {
 351         struct audit_names *n;
 352         int rc;
 353
 354         if (name) {
 355                 rc = audit_gid_comparator(gid, f->op, name->gid);
 356                 if (rc)
 357                         return rc;
 358         }
 359
 360         if (ctx) {
 361                 list_for_each_entry(n, &ctx->names_list, list) {
 362                         rc = audit_gid_comparator(gid, f->op, n->gid);
 363                         if (rc)
 364                                 return rc;
 365                 }
 366         }
 367         return 0;
 368 }
 369
 370 static int audit_field_compare(struct task_struct *tsk,
 371                                const struct cred *cred,
 372                                struct audit_field *f,
 373                                struct audit_context *ctx,
 374                                struct audit_names *name)
 375 {
 376         switch (f->val) {
 377         /* process to file object comparisons */
 378         case AUDIT_COMPARE_UID_TO_OBJ_UID:
 379                 return audit_compare_uid(cred->uid, name, f, ctx);
 380         case AUDIT_COMPARE_GID_TO_OBJ_GID:
 381                 return audit_compare_gid(cred->gid, name, f, ctx);
 382         case AUDIT_COMPARE_EUID_TO_OBJ_UID:
 383                 return audit_compare_uid(cred->euid, name, f, ctx);
 384         case AUDIT_COMPARE_EGID_TO_OBJ_GID:
 385                 return audit_compare_gid(cred->egid, name, f, ctx);
 386         case AUDIT_COMPARE_AUID_TO_OBJ_UID:
 387                 return audit_compare_uid(tsk->loginuid, name, f, ctx);
 388         case AUDIT_COMPARE_SUID_TO_OBJ_UID:
 389                 return audit_compare_uid(cred->suid, name, f, ctx);
 390         case AUDIT_COMPARE_SGID_TO_OBJ_GID:
 391                 return audit_compare_gid(cred->sgid, name, f, ctx);
 392         case AUDIT_COMPARE_FSUID_TO_OBJ_UID:
 393                 return audit_compare_uid(cred->fsuid, name, f, ctx);
 394         case AUDIT_COMPARE_FSGID_TO_OBJ_GID:
 395                 return audit_compare_gid(cred->fsgid, name, f, ctx);
 396         /* uid comparisons */
 397         case AUDIT_COMPARE_UID_TO_AUID:
 398                 return audit_uid_comparator(cred->uid, f->op, tsk->loginuid);
 399         case AUDIT_COMPARE_UID_TO_EUID:
 400                 return audit_uid_comparator(cred->uid, f->op, cred->euid);
 401         case AUDIT_COMPARE_UID_TO_SUID:
 402                 return audit_uid_comparator(cred->uid, f->op, cred->suid);
 403         case AUDIT_COMPARE_UID_TO_FSUID:
 404                 return audit_uid_comparator(cred->uid, f->op, cred->fsuid);
 405         /* auid comparisons */
 406         case AUDIT_COMPARE_AUID_TO_EUID:
 407                 return audit_uid_comparator(tsk->loginuid, f->op, cred->euid);
 408         case AUDIT_COMPARE_AUID_TO_SUID:
 409                 return audit_uid_comparator(tsk->loginuid, f->op, cred->suid);
 410         case AUDIT_COMPARE_AUID_TO_FSUID:
 411                 return audit_uid_comparator(tsk->loginuid, f->op, cred->fsuid);
 412         /* euid comparisons */
 413         case AUDIT_COMPARE_EUID_TO_SUID:
 414                 return audit_uid_comparator(cred->euid, f->op, cred->suid);
 415         case AUDIT_COMPARE_EUID_TO_FSUID:
 416                 return audit_uid_comparator(cred->euid, f->op, cred->fsuid);
 417         /* suid comparisons */
 418         case AUDIT_COMPARE_SUID_TO_FSUID:
 419                 return audit_uid_comparator(cred->suid, f->op, cred->fsuid);
 420         /* gid comparisons */
 421         case AUDIT_COMPARE_GID_TO_EGID:
 422                 return audit_gid_comparator(cred->gid, f->op, cred->egid);
 423         case AUDIT_COMPARE_GID_TO_SGID:
 424                 return audit_gid_comparator(cred->gid, f->op, cred->sgid);
 425         case AUDIT_COMPARE_GID_TO_FSGID:
 426                 return audit_gid_comparator(cred->gid, f->op, cred->fsgid);
 427         /* egid comparisons */
 428         case AUDIT_COMPARE_EGID_TO_SGID:
 429                 return audit_gid_comparator(cred->egid, f->op, cred->sgid);
 430         case AUDIT_COMPARE_EGID_TO_FSGID:
 431                 return audit_gid_comparator(cred->egid, f->op, cred->fsgid);
 432         /* sgid comparison */
 433         case AUDIT_COMPARE_SGID_TO_FSGID:
 434                 return audit_gid_comparator(cred->sgid, f->op, cred->fsgid);
 435         default:
 436                 WARN(1, "Missing AUDIT_COMPARE define.  Report as a bug\n");
 437                 return 0;
 438         }
 439         return 0;
 440 }
 441
 442 /* Determine if any context name data matches a rule's watch data */
 443 /* Compare a task_struct with an audit_rule.  Return 1 on match, 0
 444  * otherwise.
 445  *
 446  * If task_creation is true, this is an explicit indication that we are
 447  * filtering a task rule at task creation time.  This and tsk == current are
 448  * the only situations where tsk->cred may be accessed without an rcu read lock.
 449  */
 450 static int audit_filter_rules(struct task_struct *tsk,
 451                               struct audit_krule *rule,
 452                               struct audit_context *ctx,
 453                               struct audit_names *name,
 454                               enum audit_state *state,
 455                               bool task_creation)
 456 {
 457         const struct cred *cred;
 458         int i, need_sid = 1;
 459         u32 sid;
 460
 461         cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
 462
 463         for (i = 0; i < rule->field_count; i++) {
 464                 struct audit_field *f = &rule->fields[i];
 465                 struct audit_names *n;
 466                 int result = 0;
 467
 468                 switch (f->type) {
 469                 case AUDIT_PID:
 470                         result = audit_comparator(tsk->pid, f->op, f->val);
 471                         break;
 472                 case AUDIT_PPID:
 473                         if (ctx) {
 474                                 if (!ctx->ppid)
 475                                         ctx->ppid = sys_getppid();
 476                                 result = audit_comparator(ctx->ppid, f->op, f->val);
 477                         }
 478                         break;
 479                 case AUDIT_UID:
 480                         result = audit_uid_comparator(cred->uid, f->op, f->uid);
 481                         break;
 482                 case AUDIT_EUID:
 483                         result = audit_uid_comparator(cred->euid, f->op, f->uid);
 484                         break;
 485                 case AUDIT_SUID:
 486                         result = audit_uid_comparator(cred->suid, f->op, f->uid);
 487                         break;
 488                 case AUDIT_FSUID:
 489                         result = audit_uid_comparator(cred->fsuid, f->op, f->uid);
 490                         break;
 491                 case AUDIT_GID:
 492                         result = audit_gid_comparator(cred->gid, f->op, f->gid);
 493                         if (f->op == Audit_equal) {
 494                                 if (!result)
 495                                         result = in_group_p(f->gid);
 496                         } else if (f->op == Audit_not_equal) {
 497                                 if (result)
 498                                         result = !in_group_p(f->gid);
 499                         }
 500                         break;
 501                 case AUDIT_EGID:
 502                         result = audit_gid_comparator(cred->egid, f->op, f->gid);
 503                         if (f->op == Audit_equal) {
 504                                 if (!result)
 505                                         result = in_egroup_p(f->gid);
 506                         } else if (f->op == Audit_not_equal) {
 507                                 if (result)
 508                                         result = !in_egroup_p(f->gid);
 509                         }
 510                         break;
 511                 case AUDIT_SGID:
 512                         result = audit_gid_comparator(cred->sgid, f->op, f->gid);
 513                         break;
 514                 case AUDIT_FSGID:
 515                         result = audit_gid_comparator(cred->fsgid, f->op, f->gid);
 516                         break;
 517                 case AUDIT_PERS:
 518                         result = audit_comparator(tsk->personality, f->op, f->val);
 519                         break;
 520                 case AUDIT_ARCH:
 521                         if (ctx)
 522                                 result = audit_comparator(ctx->arch, f->op, f->val);
 523                         break;
 524
 525                 case AUDIT_EXIT:
 526                         if (ctx && ctx->return_valid)
 527                                 result = audit_comparator(ctx->return_code, f->op, f->val);
 528                         break;
 529                 case AUDIT_SUCCESS:
 530                         if (ctx && ctx->return_valid) {
 531                                 if (f->val)
 532                                         result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
 533                                 else
 534                                         result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
 535                         }
 536                         break;
 537                 case AUDIT_DEVMAJOR:
 538                         if (name) {
 539                                 if (audit_comparator(MAJOR(name->dev), f->op, f->val) ||
 540                                     audit_comparator(MAJOR(name->rdev), f->op, f->val))
 541                                         ++result;
 542                         } else if (ctx) {
 543                                 list_for_each_entry(n, &ctx->names_list, list) {
 544                                         if (audit_comparator(MAJOR(n->dev), f->op, f->val) ||
 545                                             audit_comparator(MAJOR(n->rdev), f->op, f->val)) {
 546                                                 ++result;
 547                                                 break;
 548                                         }
 549                                 }
 550                         }
 551                         break;
 552                 case AUDIT_DEVMINOR:
 553                         if (name) {
 554                                 if (audit_comparator(MINOR(name->dev), f->op, f->val) ||
 555                                     audit_comparator(MINOR(name->rdev), f->op, f->val))
 556                                         ++result;
 557                         } else if (ctx) {
 558                                 list_for_each_entry(n, &ctx->names_list, list) {
 559                                         if (audit_comparator(MINOR(n->dev), f->op, f->val) ||
 560                                             audit_comparator(MINOR(n->rdev), f->op, f->val)) {
 561                                                 ++result;
 562                                                 break;
 563                                         }
 564                                 }
 565                         }
 566                         break;
 567                 case AUDIT_INODE:
 568                         if (name)
 569                                 result = (name->ino == f->val);
 570                         else if (ctx) {
 571                                 list_for_each_entry(n, &ctx->names_list, list) {
 572                                         if (audit_comparator(n->ino, f->op, f->val)) {
 573                                                 ++result;
 574                                                 break;
 575                                         }
 576                                 }
 577                         }
 578                         break;
 579                 case AUDIT_OBJ_UID:
 580                         if (name) {
 581                                 result = audit_uid_comparator(name->uid, f->op, f->uid);
 582                         } else if (ctx) {
 583                                 list_for_each_entry(n, &ctx->names_list, list) {
 584                                         if (audit_uid_comparator(n->uid, f->op, f->uid)) {
 585                                                 ++result;
 586                                                 break;
 587                                         }
 588                                 }
 589                         }
 590                         break;
 591                 case AUDIT_OBJ_GID:
 592                         if (name) {
 593                                 result = audit_gid_comparator(name->gid, f->op, f->gid);
 594                         } else if (ctx) {
 595                                 list_for_each_entry(n, &ctx->names_list, list) {
 596                                         if (audit_gid_comparator(n->gid, f->op, f->gid)) {
 597                                                 ++result;
 598                                                 break;
 599                                         }
 600                                 }
 601                         }
 602                         break;
 603                 case AUDIT_WATCH:
 604                         if (name)
 605                                 result = audit_watch_compare(rule->watch, name->ino, name->dev);
 606                         break;
 607                 case AUDIT_DIR:
 608                         if (ctx)
 609                                 result = match_tree_refs(ctx, rule->tree);
 610                         break;
 611                 case AUDIT_LOGINUID:
 612                         result = 0;
 613                         if (ctx)
 614                                 result = audit_uid_comparator(tsk->loginuid, f->op, f->uid);
 615                         break;
 616                 case AUDIT_LOGINUID_SET:
 617                         result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
 618                         break;
 619                 case AUDIT_SUBJ_USER:
 620                 case AUDIT_SUBJ_ROLE:
 621                 case AUDIT_SUBJ_TYPE:
 622                 case AUDIT_SUBJ_SEN:
 623                 case AUDIT_SUBJ_CLR:
 624                         /* NOTE: this may return negative values indicating
 625                            a temporary error.  We simply treat this as a
 626                            match for now to avoid losing information that
 627                            may be wanted.   An error message will also be
 628                            logged upon error */
 629                         if (f->lsm_rule) {
 630                                 if (need_sid) {
 631                                         security_task_getsecid(tsk, &sid);
 632                                         need_sid = 0;
 633                                 }
 634                                 result = security_audit_rule_match(sid, f->type,
 635                                                                   f->op,
 636                                                                   f->lsm_rule,
 637                                                                   ctx);
 638                         }
 639                         break;
 640                 case AUDIT_OBJ_USER:
 641                 case AUDIT_OBJ_ROLE:
 642                 case AUDIT_OBJ_TYPE:
 643                 case AUDIT_OBJ_LEV_LOW:
 644                 case AUDIT_OBJ_LEV_HIGH:
 645                         /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR
 646                            also applies here */
 647                         if (f->lsm_rule) {
 648                                 /* Find files that match */
 649                                 if (name) {
 650                                         result = security_audit_rule_match(
 651                                                    name->osid, f->type, f->op,
 652                                                    f->lsm_rule, ctx);
 653                                 } else if (ctx) {
 654                                         list_for_each_entry(n, &ctx->names_list, list) {
 655                                                 if (security_audit_rule_match(n->osid, f->type,
 656                                                                               f->op, f->lsm_rule,
 657                                                                               ctx)) {
 658                                                         ++result;
 659                                                         break;
 660                                                 }
 661                                         }
 662                                 }
 663                                 /* Find ipc objects that match */
 664                                 if (!ctx || ctx->type != AUDIT_IPC)
 665                                         break;
 666                                 if (security_audit_rule_match(ctx->ipc.osid,
 667                                                               f->type, f->op,
 668                                                               f->lsm_rule, ctx))
 669                                         ++result;
 670                         }
 671                         break;
 672                 case AUDIT_ARG0:
 673                 case AUDIT_ARG1:
 674                 case AUDIT_ARG2:
 675                 case AUDIT_ARG3:
 676                         if (ctx)
 677                                 result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
 678                         break;
 679                 case AUDIT_FILTERKEY:
 680                         /* ignore this field for filtering */
 681                         result = 1;
 682                         break;
 683                 case AUDIT_PERM:
 684                         result = audit_match_perm(ctx, f->val);
 685                         break;
 686                 case AUDIT_FILETYPE:
 687                         result = audit_match_filetype(ctx, f->val);
 688                         break;
 689                 case AUDIT_FIELD_COMPARE:
 690                         result = audit_field_compare(tsk, cred, f, ctx, name);
 691                         break;
 692                 }
 693                 if (!result)
 694                         return 0;
 695         }
 696
 697         if (ctx) {
 698                 if (rule->prio <= ctx->prio)
 699                         return 0;
 700                 if (rule->filterkey) {
 701                         kfree(ctx->filterkey);
 702                         ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
 703                 }
 704                 ctx->prio = rule->prio;
 705         }
 706         switch (rule->action) {
 707         case AUDIT_NEVER:    *state = AUDIT_DISABLED;       break;
 708         case AUDIT_ALWAYS:   *state = AUDIT_RECORD_CONTEXT; break;
 709         }
 710         return 1;
 711 }
 712
 713 /* At process creation time, we can determine if system-call auditing is
 714  * completely disabled for this task.  Since we only have the task
 715  * structure at this point, we can only check uid and gid.
 716  */
 717 static enum audit_state audit_filter_task(struct task_struct *tsk, char **key)
 718 {
 719         struct audit_entry *e;
 720         enum audit_state   state;
 721
 722         rcu_read_lock();
 723         list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
 724                 if (audit_filter_rules(tsk, &e->rule, NULL, NULL,
 725                                        &state, true)) {
 726                         if (state == AUDIT_RECORD_CONTEXT)
 727                                 *key = kstrdup(e->rule.filterkey, GFP_ATOMIC);
 728                         rcu_read_unlock();
 729                         return state;
 730                 }
 731         }
 732         rcu_read_unlock();
 733         return AUDIT_BUILD_CONTEXT;
 734 }
 735
 736 /* At syscall entry and exit time, this filter is called if the
 737  * audit_state is not low enough that auditing cannot take place, but is
 738  * also not high enough that we already know we have to write an audit
 739  * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
 740  */
 741 static enum audit_state audit_filter_syscall(struct task_struct *tsk,
 742                                              struct audit_context *ctx,
 743                                              struct list_head *list)
 744 {
 745         struct audit_entry *e;
 746         enum audit_state state;
 747
 748         if (audit_pid && tsk->tgid == audit_pid)
 749                 return AUDIT_DISABLED;
 750
 751         rcu_read_lock();
 752         if (!list_empty(list)) {
 753                 int word = AUDIT_WORD(ctx->major);
 754                 int bit  = AUDIT_BIT(ctx->major);
 755
 756                 list_for_each_entry_rcu(e, list, list) {
 757                         if ((e->rule.mask[word] & bit) == bit &&
 758                             audit_filter_rules(tsk, &e->rule, ctx, NULL,
 759                                                &state, false)) {
 760                                 rcu_read_unlock();
 761                                 ctx->current_state = state;
 762                                 return state;
 763                         }
 764                 }
 765         }
 766         rcu_read_unlock();
 767         return AUDIT_BUILD_CONTEXT;
 768 }
 769
 770 /*
 771  * Given an audit_name check the inode hash table to see if they match.
 772  * Called holding the rcu read lock to protect the use of audit_inode_hash
 773  */
 774 static int audit_filter_inode_name(struct task_struct *tsk,
 775                                    struct audit_names *n,
 776                                    struct audit_context *ctx) {
 777         int word, bit;
 778         int h = audit_hash_ino((u32)n->ino);
 779         struct list_head *list = &audit_inode_hash[h];
 780         struct audit_entry *e;
 781         enum audit_state state;
 782
 783         word = AUDIT_WORD(ctx->major);
 784         bit  = AUDIT_BIT(ctx->major);
 785
 786         if (list_empty(list))
 787                 return 0;
 788
 789         list_for_each_entry_rcu(e, list, list) {
 790                 if ((e->rule.mask[word] & bit) == bit &&
 791                     audit_filter_rules(tsk, &e->rule, ctx, n, &state, false)) {
 792                         ctx->current_state = state;
 793                         return 1;
 794                 }
 795         }
 796
 797         return 0;
 798 }
 799
 800 /* At syscall exit time, this filter is called if any audit_names have been
 801  * collected during syscall processing.  We only check rules in sublists at hash
 802  * buckets applicable to the inode numbers in audit_names.
 803  * Regarding audit_state, same rules apply as for audit_filter_syscall().
 804  */
 805 void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
 806 {
 807         struct audit_names *n;
 808
 809         if (audit_pid && tsk->tgid == audit_pid)
 810                 return;
 811
 812         rcu_read_lock();
 813
 814         list_for_each_entry(n, &ctx->names_list, list) {
 815                 if (audit_filter_inode_name(tsk, n, ctx))
 816                         break;
 817         }
 818         rcu_read_unlock();
 819 }
 820
 821 static inline struct audit_context *audit_get_context(struct task_struct *tsk,
 822                                                       int return_valid,
 823                                                       long return_code)
 824 {
 825         struct audit_context *context = tsk->audit_context;
 826
 827         if (!context)
 828                 return NULL;
 829         context->return_valid = return_valid;
 830
 831         /*
 832          * we need to fix up the return code in the audit logs if the actual
 833          * return codes are later going to be fixed up by the arch specific
 834          * signal handlers
 835          *
 836          * This is actually a test for:
 837          * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
 838          * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
 839          *
 840          * but is faster than a bunch of ||
 841          */
 842         if (unlikely(return_code <= -ERESTARTSYS) &&
 843             (return_code >= -ERESTART_RESTARTBLOCK) &&
 844             (return_code != -ENOIOCTLCMD))
 845                 context->return_code = -EINTR;
 846         else
 847                 context->return_code  = return_code;
 848
 849         if (context->in_syscall && !context->dummy) {
 850                 audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
 851                 audit_filter_inodes(tsk, context);
 852         }
 853
 854         tsk->audit_context = NULL;
 855         return context;
 856 }
 857
 858 static inline void audit_free_names(struct audit_context *context)
 859 {
 860         struct audit_names *n, *next;
 861
 862 #if AUDIT_DEBUG == 2
 863         if (context->put_count + context->ino_count != context->name_count) {
 864                 int i = 0;
 865
 866                 printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d"
 867                        " name_count=%d put_count=%d"
 868                        " ino_count=%d [NOT freeing]\n",
 869                        __FILE__, __LINE__,
 870                        context->serial, context->major, context->in_syscall,
 871                        context->name_count, context->put_count,
 872                        context->ino_count);
 873                 list_for_each_entry(n, &context->names_list, list) {
 874                         printk(KERN_ERR "names[%d] = %p = %s\n", i++,
 875                                n->name, n->name->name ?: "(null)");
 876                 }
 877                 dump_stack();
 878                 return;
 879         }
 880 #endif
 881 #if AUDIT_DEBUG
 882         context->put_count  = 0;
 883         context->ino_count  = 0;
 884 #endif
 885
 886         list_for_each_entry_safe(n, next, &context->names_list, list) {
 887                 list_del(&n->list);
 888                 if (n->name && n->name_put)
 889                         final_putname(n->name);
 890                 if (n->should_free)
 891                         kfree(n);
 892         }
 893         context->name_count = 0;
 894         path_put(&context->pwd);
 895         context->pwd.dentry = NULL;
 896         context->pwd.mnt = NULL;
 897 }
 898
 899 static inline void audit_free_aux(struct audit_context *context)
 900 {
 901         struct audit_aux_data *aux;
 902
 903         while ((aux = context->aux)) {
 904                 context->aux = aux->next;
 905                 kfree(aux);
 906         }
 907         while ((aux = context->aux_pids)) {
 908                 context->aux_pids = aux->next;
 909                 kfree(aux);
 910         }
 911 }
 912
 913 static inline struct audit_context *audit_alloc_context(enum audit_state state)
 914 {
 915         struct audit_context *context;
 916
 917         context = kzalloc(sizeof(*context), GFP_KERNEL);
 918         if (!context)
 919                 return NULL;
 920         context->state = state;
 921         context->prio = state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
 922         INIT_LIST_HEAD(&context->killed_trees);
 923         INIT_LIST_HEAD(&context->names_list);
 924         return context;
 925 }
 926
 927 /**
 928  * audit_alloc - allocate an audit context block for a task
 929  * @tsk: task
 930  *
 931  * Filter on the task information and allocate a per-task audit context
 932  * if necessary.  Doing so turns on system call auditing for the
 933  * specified task.  This is called from copy_process, so no lock is
 934  * needed.
 935  */
 936 int audit_alloc(struct task_struct *tsk)
 937 {
 938         struct audit_context *context;
 939         enum audit_state     state;
 940         char *key = NULL;
 941
 942         if (likely(!audit_ever_enabled))
 943                 return 0; /* Return if not auditing. */
 944
 945         state = audit_filter_task(tsk, &key);
 946         if (state == AUDIT_DISABLED)
 947                 return 0;
 948
 949         if (!(context = audit_alloc_context(state))) {
 950                 kfree(key);
 951                 audit_log_lost("out of memory in audit_alloc");
 952                 return -ENOMEM;
 953         }
 954         context->filterkey = key;
 955
 956         tsk->audit_context  = context;
 957         set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
 958         return 0;
 959 }
 960
 961 static inline void audit_free_context(struct audit_context *context)
 962 {
 963         audit_free_names(context);
 964         unroll_tree_refs(context, NULL, 0);
 965         free_tree_refs(context);
 966         audit_free_aux(context);
 967         kfree(context->filterkey);
 968         kfree(context->sockaddr);
 969         kfree(context);
 970 }
 971
 972 static int audit_log_pid_context(struct audit_context *context, pid_t pid,
 973                                  kuid_t auid, kuid_t uid, unsigned int sessionid,
 974                                  u32 sid, char *comm)
 975 {
 976         struct audit_buffer *ab;
 977         char *ctx = NULL;
 978         u32 len;
 979         int rc = 0;
 980
 981         ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID);
 982         if (!ab)
 983                 return rc;
 984
 985         audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid,
 986                          from_kuid(&init_user_ns, auid),
 987                          from_kuid(&init_user_ns, uid), sessionid);
 988         if (sid) {
 989                 if (security_secid_to_secctx(sid, &ctx, &len)) {
 990                         audit_log_format(ab, " obj=(none)");
 991                         rc = 1;
 992                 } else {
 993                         audit_log_format(ab, " obj=%s", ctx);
 994                         security_release_secctx(ctx, len);
 995                 }
 996         }
 997         audit_log_format(ab, " ocomm=");
 998         audit_log_untrustedstring(ab, comm);
 999         audit_log_end(ab);
1000
1001         return rc;
1002 }
1003
1004 /*
1005  * to_send and len_sent accounting are very loose estimates.  We aren't
1006  * really worried about a hard cap to MAX_EXECVE_AUDIT_LEN so much as being
1007  * within about 500 bytes (next page boundary)
1008  *
1009  * why snprintf?  an int is up to 12 digits long.  if we just assumed when
1010  * logging that a[%d]= was going to be 16 characters long we would be wasting
1011  * space in every audit message.  In one 7500 byte message we can log up to
1012  * about 1000 min size arguments.  That comes down to about 50% waste of space
1013  * if we didn't do the snprintf to find out how long arg_num_len was.
1014  */
1015 static int audit_log_single_execve_arg(struct audit_context *context,
1016                                         struct audit_buffer **ab,
1017                                         int arg_num,
1018                                         size_t *len_sent,
1019                                         const char __user *p,
1020                                         char *buf)
1021 {
1022         char arg_num_len_buf[12];
1023         const char __user *tmp_p = p;
1024         /* how many digits are in arg_num? 5 is the length of ' a=""' */
1025         size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 5;
1026         size_t len, len_left, to_send;
1027         size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN;
1028         unsigned int i, has_cntl = 0, too_long = 0;
1029         int ret;
1030
1031         /* strnlen_user includes the null we don't want to send */
1032         len_left = len = strnlen_user(p, MAX_ARG_STRLEN) - 1;
1033
1034         /*
1035          * We just created this mm, if we can't find the strings
1036          * we just copied into it something is _very_ wrong. Similar
1037          * for strings that are too long, we should not have created
1038          * any.
1039          */
1040         if (unlikely((len == -1) || len > MAX_ARG_STRLEN - 1)) {
1041                 WARN_ON(1);
1042                 send_sig(SIGKILL, current, 0);
1043                 return -1;
1044         }
1045
1046         /* walk the whole argument looking for non-ascii chars */
1047         do {
1048                 if (len_left > MAX_EXECVE_AUDIT_LEN)
1049                         to_send = MAX_EXECVE_AUDIT_LEN;
1050                 else
1051                         to_send = len_left;
1052                 ret = copy_from_user(buf, tmp_p, to_send);
1053                 /*
1054                  * There is no reason for this copy to be short. We just
1055                  * copied them here, and the mm hasn't been exposed to user-
1056                  * space yet.
1057                  */
1058                 if (ret) {
1059                         WARN_ON(1);
1060                         send_sig(SIGKILL, current, 0);
1061                         return -1;
1062                 }
1063                 buf[to_send] = '\0';
1064                 has_cntl = audit_string_contains_control(buf, to_send);
1065                 if (has_cntl) {
1066                         /*
1067                          * hex messages get logged as 2 bytes, so we can only
1068                          * send half as much in each message
1069                          */
1070                         max_execve_audit_len = MAX_EXECVE_AUDIT_LEN / 2;
1071                         break;
1072                 }
1073                 len_left -= to_send;
1074                 tmp_p += to_send;
1075         } while (len_left > 0);
1076
1077         len_left = len;
1078
1079         if (len > max_execve_audit_len)
1080                 too_long = 1;
1081
1082         /* rewalk the argument actually logging the message */
1083         for (i = 0; len_left > 0; i++) {
1084                 int room_left;
1085
1086                 if (len_left > max_execve_audit_len)
1087                         to_send = max_execve_audit_len;
1088                 else
1089                         to_send = len_left;
1090
1091                 /* do we have space left to send this argument in this ab? */
1092                 room_left = MAX_EXECVE_AUDIT_LEN - arg_num_len - *len_sent;
1093                 if (has_cntl)
1094                         room_left -= (to_send * 2);
1095                 else
1096                         room_left -= to_send;
1097                 if (room_left < 0) {
1098                         *len_sent = 0;
1099                         audit_log_end(*ab);
1100                         *ab = audit_log_start(context, GFP_KERNEL, AUDIT_EXECVE);
1101                         if (!*ab)
1102                                 return 0;
1103                 }
1104
1105                 /*
1106                  * first record needs to say how long the original string was
1107                  * so we can be sure nothing was lost.
1108                  */
1109                 if ((i == 0) && (too_long))
1110                         audit_log_format(*ab, " a%d_len=%zu", arg_num,
1111                                          has_cntl ? 2*len : len);
1112
1113                 /*
1114                  * normally arguments are small enough to fit and we already
1115                  * filled buf above when we checked for control characters
1116                  * so don't bother with another copy_from_user
1117                  */
1118                 if (len >= max_execve_audit_len)
1119                         ret = copy_from_user(buf, p, to_send);
1120                 else
1121                         ret = 0;
1122                 if (ret) {
1123                         WARN_ON(1);
1124                         send_sig(SIGKILL, current, 0);
1125                         return -1;
1126                 }
1127                 buf[to_send] = '\0';
1128
1129                 /* actually log it */
1130                 audit_log_format(*ab, " a%d", arg_num);
1131                 if (too_long)
1132                         audit_log_format(*ab, "[%d]", i);
1133                 audit_log_format(*ab, "=");
1134                 if (has_cntl)
1135                         audit_log_n_hex(*ab, buf, to_send);
1136                 else
1137                         audit_log_string(*ab, buf);
1138
1139                 p += to_send;
1140                 len_left -= to_send;
1141                 *len_sent += arg_num_len;
1142                 if (has_cntl)
1143                         *len_sent += to_send * 2;
1144                 else
1145                         *len_sent += to_send;
1146         }
1147         /* include the null we didn't log */
1148         return len + 1;
1149 }
1150
1151 static void audit_log_execve_info(struct audit_context *context,
1152                                   struct audit_buffer **ab,
1153                                   struct audit_aux_data_execve *axi)
1154 {
1155         int i, len;
1156         size_t len_sent = 0;
1157         const char __user *p;
1158         char *buf;
1159
1160         if (axi->mm != current->mm)
1161                 return; /* execve failed, no additional info */
1162
1163         p = (const char __user *)axi->mm->arg_start;
1164
1165         audit_log_format(*ab, "argc=%d", axi->argc);
1166
1167         /*
1168          * we need some kernel buffer to hold the userspace args.  Just
1169          * allocate one big one rather than allocating one of the right size
1170          * for every single argument inside audit_log_single_execve_arg()
1171          * should be <8k allocation so should be pretty safe.
1172          */
1173         buf = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
1174         if (!buf) {
1175                 audit_panic("out of memory for argv string\n");
1176                 return;
1177         }
1178
1179         for (i = 0; i < axi->argc; i++) {
1180                 len = audit_log_single_execve_arg(context, ab, i,
1181                                                   &len_sent, p, buf);
1182                 if (len <= 0)
1183                         break;
1184                 p += len;
1185         }
1186         kfree(buf);
1187 }
1188
1189 static void show_special(struct audit_context *context, int *call_panic)
1190 {
1191         struct audit_buffer *ab;
1192         int i;
1193
1194         ab = audit_log_start(context, GFP_KERNEL, context->type);
1195         if (!ab)
1196                 return;
1197
1198         switch (context->type) {
1199         case AUDIT_SOCKETCALL: {
1200                 int nargs = context->socketcall.nargs;
1201                 audit_log_format(ab, "nargs=%d", nargs);
1202                 for (i = 0; i < nargs; i++)
1203                         audit_log_format(ab, " a%d=%lx", i,
1204                                 context->socketcall.args[i]);
1205                 break; }
1206         case AUDIT_IPC: {
1207                 u32 osid = context->ipc.osid;
1208
1209                 audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
1210                                  from_kuid(&init_user_ns, context->ipc.uid),
1211                                  from_kgid(&init_user_ns, context->ipc.gid),
1212                                  context->ipc.mode);
1213                 if (osid) {
1214                         char *ctx = NULL;
1215                         u32 len;
1216                         if (security_secid_to_secctx(osid, &ctx, &len)) {
1217                                 audit_log_format(ab, " osid=%u", osid);
1218                                 *call_panic = 1;
1219                         } else {
1220                                 audit_log_format(ab, " obj=%s", ctx);
1221                                 security_release_secctx(ctx, len);
1222                         }
1223                 }
1224                 if (context->ipc.has_perm) {
1225                         audit_log_end(ab);
1226                         ab = audit_log_start(context, GFP_KERNEL,
1227                                              AUDIT_IPC_SET_PERM);
1228                         if (unlikely(!ab))
1229                                 return;
1230                         audit_log_format(ab,
1231                                 "qbytes=%lx ouid=%u ogid=%u mode=%#ho",
1232                                 context->ipc.qbytes,
1233                                 context->ipc.perm_uid,
1234                                 context->ipc.perm_gid,
1235                                 context->ipc.perm_mode);
1236                 }
1237                 break; }
1238         case AUDIT_MQ_OPEN: {
1239                 audit_log_format(ab,
1240                         "oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld "
1241                         "mq_msgsize=%ld mq_curmsgs=%ld",
1242                         context->mq_open.oflag, context->mq_open.mode,
1243                         context->mq_open.attr.mq_flags,
1244                         context->mq_open.attr.mq_maxmsg,
1245                         context->mq_open.attr.mq_msgsize,
1246                         context->mq_open.attr.mq_curmsgs);
1247                 break; }
1248         case AUDIT_MQ_SENDRECV: {
1249                 audit_log_format(ab,
1250                         "mqdes=%d msg_len=%zd msg_prio=%u "
1251                         "abs_timeout_sec=%ld abs_timeout_nsec=%ld",
1252                         context->mq_sendrecv.mqdes,
1253                         context->mq_sendrecv.msg_len,
1254                         context->mq_sendrecv.msg_prio,
1255                         context->mq_sendrecv.abs_timeout.tv_sec,
1256                         context->mq_sendrecv.abs_timeout.tv_nsec);
1257                 break; }
1258         case AUDIT_MQ_NOTIFY: {
1259                 audit_log_format(ab, "mqdes=%d sigev_signo=%d",
1260                                 context->mq_notify.mqdes,
1261                                 context->mq_notify.sigev_signo);
1262                 break; }
1263         case AUDIT_MQ_GETSETATTR: {
1264                 struct mq_attr *attr = &context->mq_getsetattr.mqstat;
1265                 audit_log_format(ab,
1266                         "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
1267                         "mq_curmsgs=%ld ",
1268                         context->mq_getsetattr.mqdes,
1269                         attr->mq_flags, attr->mq_maxmsg,
1270                         attr->mq_msgsize, attr->mq_curmsgs);
1271                 break; }
1272         case AUDIT_CAPSET: {
1273                 audit_log_format(ab, "pid=%d", context->capset.pid);
1274                 audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
1275                 audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
1276                 audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
1277                 break; }
1278         case AUDIT_MMAP: {
1279                 audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
1280                                  context->mmap.flags);
1281                 break; }
1282         }
1283         audit_log_end(ab);
1284 }
1285
1286 static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
1287 {
1288         int i, call_panic = 0;
1289         struct audit_buffer *ab;
1290         struct audit_aux_data *aux;
1291         struct audit_names *n;
1292
1293         /* tsk == current */
1294         context->personality = tsk->personality;
1295
1296         ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
1297         if (!ab)
1298                 return;         /* audit_panic has been called */
1299         audit_log_format(ab, "arch=%x syscall=%d",
1300                          context->arch, context->major);
1301         if (context->personality != PER_LINUX)
1302                 audit_log_format(ab, " per=%lx", context->personality);
1303         if (context->return_valid)
1304                 audit_log_format(ab, " success=%s exit=%ld",
1305                                  (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
1306                                  context->return_code);
1307
1308         audit_log_format(ab,
1309                          " a0=%lx a1=%lx a2=%lx a3=%lx items=%d",
1310                          context->argv[0],
1311                          context->argv[1],
1312                          context->argv[2],
1313                          context->argv[3],
1314                          context->name_count);
1315
1316         audit_log_task_info(ab, tsk);
1317         audit_log_key(ab, context->filterkey);
1318         audit_log_end(ab);
1319
1320         for (aux = context->aux; aux; aux = aux->next) {
1321
1322                 ab = audit_log_start(context, GFP_KERNEL, aux->type);
1323                 if (!ab)
1324                         continue; /* audit_panic has been called */
1325
1326                 switch (aux->type) {
1327
1328                 case AUDIT_EXECVE: {
1329                         struct audit_aux_data_execve *axi = (void *)aux;
1330                         audit_log_execve_info(context, &ab, axi);
1331                         break; }
1332
1333                 case AUDIT_BPRM_FCAPS: {
1334                         struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
1335                         audit_log_format(ab, "fver=%x", axs->fcap_ver);
1336                         audit_log_cap(ab, "fp", &axs->fcap.permitted);
1337                         audit_log_cap(ab, "fi", &axs->fcap.inheritable);
1338                         audit_log_format(ab, " fe=%d", axs->fcap.fE);
1339                         audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
1340                         audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
1341                         audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
1342                         audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted);
1343                         audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable);
1344                         audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
1345                         break; }
1346
1347                 }
1348                 audit_log_end(ab);
1349         }
1350
1351         if (context->type)
1352                 show_special(context, &call_panic);
1353
1354         if (context->fds[0] >= 0) {
1355                 ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
1356                 if (ab) {
1357                         audit_log_format(ab, "fd0=%d fd1=%d",
1358                                         context->fds[0], context->fds[1]);
1359                         audit_log_end(ab);
1360                 }
1361         }
1362
1363         if (context->sockaddr_len) {
1364                 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
1365                 if (ab) {
1366                         audit_log_format(ab, "saddr=");
1367                         audit_log_n_hex(ab, (void *)context->sockaddr,
1368                                         context->sockaddr_len);
1369                         audit_log_end(ab);
1370                 }
1371         }
1372
1373         for (aux = context->aux_pids; aux; aux = aux->next) {
1374                 struct audit_aux_data_pids *axs = (void *)aux;
1375
1376                 for (i = 0; i < axs->pid_count; i++)
1377                         if (audit_log_pid_context(context, axs->target_pid[i],
1378                                                   axs->target_auid[i],
1379                                                   axs->target_uid[i],
1380                                                   axs->target_sessionid[i],
1381                                                   axs->target_sid[i],
1382                                                   axs->target_comm[i]))
1383                                 call_panic = 1;
1384         }
1385
1386         if (context->target_pid &&
1387             audit_log_pid_context(context, context->target_pid,
1388                                   context->target_auid, context->target_uid,
1389                                   context->target_sessionid,
1390                                   context->target_sid, context->target_comm))
1391                         call_panic = 1;
1392
1393         if (context->pwd.dentry && context->pwd.mnt) {
1394                 ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
1395                 if (ab) {
1396                         audit_log_d_path(ab, " cwd=", &context->pwd);
1397                         audit_log_end(ab);
1398                 }
1399         }
1400
1401         i = 0;
1402         list_for_each_entry(n, &context->names_list, list) {
1403                 if (n->hidden)
1404                         continue;
1405                 audit_log_name(context, n, NULL, i++, &call_panic);
1406         }
1407
1408         /* Send end of event record to help user space know we are finished */
1409         ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
1410         if (ab)
1411                 audit_log_end(ab);
1412         if (call_panic)
1413                 audit_panic("error converting sid to string");
1414 }
1415
1416 /**
1417  * audit_free - free a per-task audit context
1418  * @tsk: task whose audit context block to free
1419  *
1420  * Called from copy_process and do_exit
1421  */
1422 void __audit_free(struct task_struct *tsk)
1423 {
1424         struct audit_context *context;
1425
1426         context = audit_get_context(tsk, 0, 0);
1427         if (!context)
1428                 return;
1429
1430         /* Check for system calls that do not go through the exit
1431          * function (e.g., exit_group), then free context block.
1432          * We use GFP_ATOMIC here because we might be doing this
1433          * in the context of the idle thread */
1434         /* that can happen only if we are called from do_exit() */
1435         if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
1436                 audit_log_exit(context, tsk);
1437         if (!list_empty(&context->killed_trees))
1438                 audit_kill_trees(&context->killed_trees);
1439
1440         audit_free_context(context);
1441 }
1442
1443 /**
1444  * audit_syscall_entry - fill in an audit record at syscall entry
1445  * @arch: architecture type
1446  * @major: major syscall type (function)
1447  * @a1: additional syscall register 1
1448  * @a2: additional syscall register 2
1449  * @a3: additional syscall register 3
1450  * @a4: additional syscall register 4
1451  *
1452  * Fill in audit context at syscall entry.  This only happens if the
1453  * audit context was created when the task was created and the state or
1454  * filters demand the audit context be built.  If the state from the
1455  * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
1456  * then the record will be written at syscall exit time (otherwise, it
1457  * will only be written if another part of the kernel requests that it
1458  * be written).
1459  */
1460 void __audit_syscall_entry(int arch, int major,
1461                          unsigned long a1, unsigned long a2,
1462                          unsigned long a3, unsigned long a4)
1463 {
1464         struct task_struct *tsk = current;
1465         struct audit_context *context = tsk->audit_context;
1466         enum audit_state     state;
1467
1468         if (!context)
1469                 return;
1470
1471         BUG_ON(context->in_syscall || context->name_count);
1472
1473         if (!audit_enabled)
1474                 return;
1475
1476         context->arch       = arch;
1477         context->major      = major;
1478         context->argv[0]    = a1;
1479         context->argv[1]    = a2;
1480         context->argv[2]    = a3;
1481         context->argv[3]    = a4;
1482
1483         state = context->state;
1484         context->dummy = !audit_n_rules;
1485         if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
1486                 context->prio = 0;
1487                 state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
1488         }
1489         if (state == AUDIT_DISABLED)
1490                 return;
1491
1492         context->serial     = 0;
1493         context->ctime      = CURRENT_TIME;
1494         context->in_syscall = 1;
1495         context->current_state  = state;
1496         context->ppid       = 0;
1497 }
1498
1499 /**
1500  * audit_syscall_exit - deallocate audit context after a system call
1501  * @success: success value of the syscall
1502  * @return_code: return value of the syscall
1503  *
1504  * Tear down after system call.  If the audit context has been marked as
1505  * auditable (either because of the AUDIT_RECORD_CONTEXT state from
1506  * filtering, or because some other part of the kernel wrote an audit
1507  * message), then write out the syscall information.  In call cases,
1508  * free the names stored from getname().
1509  */
1510 void __audit_syscall_exit(int success, long return_code)
1511 {
1512         struct task_struct *tsk = current;
1513         struct audit_context *context;
1514
1515         if (success)
1516                 success = AUDITSC_SUCCESS;
1517         else
1518                 success = AUDITSC_FAILURE;
1519
1520         context = audit_get_context(tsk, success, return_code);
1521         if (!context)
1522                 return;
1523
1524         if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
1525                 audit_log_exit(context, tsk);
1526
1527         context->in_syscall = 0;
1528         context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
1529
1530         if (!list_empty(&context->killed_trees))
1531                 audit_kill_trees(&context->killed_trees);
1532
1533         audit_free_names(context);
1534         unroll_tree_refs(context, NULL, 0);
1535         audit_free_aux(context);
1536         context->aux = NULL;
1537         context->aux_pids = NULL;
1538         context->target_pid = 0;
1539         context->target_sid = 0;
1540         context->sockaddr_len = 0;
1541         context->type = 0;
1542         context->fds[0] = -1;
1543         if (context->state != AUDIT_RECORD_CONTEXT) {
1544                 kfree(context->filterkey);
1545                 context->filterkey = NULL;
1546         }
1547         tsk->audit_context = context;
1548 }
1549
1550 static inline void handle_one(const struct inode *inode)
1551 {
1552 #ifdef CONFIG_AUDIT_TREE
1553         struct audit_context *context;
1554         struct audit_tree_refs *p;
1555         struct audit_chunk *chunk;
1556         int count;
1557         if (likely(hlist_empty(&inode->i_fsnotify_marks)))
1558                 return;
1559         context = current->audit_context;
1560         p = context->trees;
1561         count = context->tree_count;
1562         rcu_read_lock();
1563         chunk = audit_tree_lookup(inode);
1564         rcu_read_unlock();
1565         if (!chunk)
1566                 return;
1567         if (likely(put_tree_ref(context, chunk)))
1568                 return;
1569         if (unlikely(!grow_tree_refs(context))) {
1570                 printk(KERN_WARNING "out of memory, audit has lost a tree reference\n");
1571                 audit_set_auditable(context);
1572                 audit_put_chunk(chunk);
1573                 unroll_tree_refs(context, p, count);
1574                 return;
1575         }
1576         put_tree_ref(context, chunk);
1577 #endif
1578 }
1579
1580 static void handle_path(const struct dentry *dentry)
1581 {
1582 #ifdef CONFIG_AUDIT_TREE
1583         struct audit_context *context;
1584         struct audit_tree_refs *p;
1585         const struct dentry *d, *parent;
1586         struct audit_chunk *drop;
1587         unsigned long seq;
1588         int count;
1589
1590         context = current->audit_context;
1591         p = context->trees;
1592         count = context->tree_count;
1593 retry:
1594         drop = NULL;
1595         d = dentry;
1596         rcu_read_lock();
1597         seq = read_seqbegin(&rename_lock);
1598         for(;;) {
1599                 struct inode *inode = d->d_inode;
1600                 if (inode && unlikely(!hlist_empty(&inode->i_fsnotify_marks))) {
1601                         struct audit_chunk *chunk;
1602                         chunk = audit_tree_lookup(inode);
1603                         if (chunk) {
1604                                 if (unlikely(!put_tree_ref(context, chunk))) {
1605                                         drop = chunk;
1606                                         break;
1607                                 }
1608                         }
1609                 }
1610                 parent = d->d_parent;
1611                 if (parent == d)
1612                         break;
1613                 d = parent;
1614         }
1615         if (unlikely(read_seqretry(&rename_lock, seq) || drop)) {  /* in this order */
1616                 rcu_read_unlock();
1617                 if (!drop) {
1618                         /* just a race with rename */
1619                         unroll_tree_refs(context, p, count);
1620                         goto retry;
1621                 }
1622                 audit_put_chunk(drop);
1623                 if (grow_tree_refs(context)) {
1624                         /* OK, got more space */
1625                         unroll_tree_refs(context, p, count);
1626                         goto retry;
1627                 }
1628                 /* too bad */
1629                 printk(KERN_WARNING
1630                         "out of memory, audit has lost a tree reference\n");
1631                 unroll_tree_refs(context, p, count);
1632                 audit_set_auditable(context);
1633                 return;
1634         }
1635         rcu_read_unlock();
1636 #endif
1637 }
1638
1639 static struct audit_names *audit_alloc_name(struct audit_context *context,
1640                                                 unsigned char type)
1641 {
1642         struct audit_names *aname;
1643
1644         if (context->name_count < AUDIT_NAMES) {
1645                 aname = &context->preallocated_names[context->name_count];
1646                 memset(aname, 0, sizeof(*aname));
1647         } else {
1648                 aname = kzalloc(sizeof(*aname), GFP_NOFS);
1649                 if (!aname)
1650                         return NULL;
1651                 aname->should_free = true;
1652         }
1653
1654         aname->ino = (unsigned long)-1;
1655         aname->type = type;
1656         list_add_tail(&aname->list, &context->names_list);
1657
1658         context->name_count++;
1659 #if AUDIT_DEBUG
1660         context->ino_count++;
1661 #endif
1662         return aname;
1663 }
1664
1665 /**
1666  * audit_reusename - fill out filename with info from existing entry
1667  * @uptr: userland ptr to pathname
1668  *
1669  * Search the audit_names list for the current audit context. If there is an
1670  * existing entry with a matching "uptr" then return the filename
1671  * associated with that audit_name. If not, return NULL.
1672  */
1673 struct filename *
1674 __audit_reusename(const __user char *uptr)
1675 {
1676         struct audit_context *context = current->audit_context;
1677         struct audit_names *n;
1678
1679         list_for_each_entry(n, &context->names_list, list) {
1680                 if (!n->name)
1681                         continue;
1682                 if (n->name->uptr == uptr)
1683                         return n->name;
1684         }
1685         return NULL;
1686 }
1687
1688 /**
1689  * audit_getname - add a name to the list
1690  * @name: name to add
1691  *
1692  * Add a name to the list of audit names for this context.
1693  * Called from fs/namei.c:getname().
1694  */
1695 void __audit_getname(struct filename *name)
1696 {
1697         struct audit_context *context = current->audit_context;
1698         struct audit_names *n;
1699
1700         if (!context->in_syscall) {
1701 #if AUDIT_DEBUG == 2
1702                 printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n",
1703                        __FILE__, __LINE__, context->serial, name);
1704                 dump_stack();
1705 #endif
1706                 return;
1707         }
1708
1709 #if AUDIT_DEBUG
1710         /* The filename _must_ have a populated ->name */
1711         BUG_ON(!name->name);
1712 #endif
1713
1714         n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
1715         if (!n)
1716                 return;
1717
1718         n->name = name;
1719         n->name_len = AUDIT_NAME_FULL;
1720         n->name_put = true;
1721         name->aname = n;
1722
1723         if (!context->pwd.dentry)
1724                 get_fs_pwd(current->fs, &context->pwd);
1725 }
1726
1727 /* audit_putname - intercept a putname request
1728  * @name: name to intercept and delay for putname
1729  *
1730  * If we have stored the name from getname in the audit context,
1731  * then we delay the putname until syscall exit.
1732  * Called from include/linux/fs.h:putname().
1733  */
1734 void audit_putname(struct filename *name)
1735 {
1736         struct audit_context *context = current->audit_context;
1737
1738         BUG_ON(!context);
1739         if (!context->in_syscall) {
1740 #if AUDIT_DEBUG == 2
1741                 printk(KERN_ERR "%s:%d(:%d): final_putname(%p)\n",
1742                        __FILE__, __LINE__, context->serial, name);
1743                 if (context->name_count) {
1744                         struct audit_names *n;
1745                         int i = 0;
1746
1747                         list_for_each_entry(n, &context->names_list, list)
1748                                 printk(KERN_ERR "name[%d] = %p = %s\n", i++,
1749                                        n->name, n->name->name ?: "(null)");
1750                         }
1751 #endif
1752                 final_putname(name);
1753         }
1754 #if AUDIT_DEBUG
1755         else {
1756                 ++context->put_count;
1757                 if (context->put_count > context->name_count) {
1758                         printk(KERN_ERR "%s:%d(:%d): major=%d"
1759                                " in_syscall=%d putname(%p) name_count=%d"
1760                                " put_count=%d\n",
1761                                __FILE__, __LINE__,
1762                                context->serial, context->major,
1763                                context->in_syscall, name->name,
1764                                context->name_count, context->put_count);
1765                         dump_stack();
1766                 }
1767         }
1768 #endif
1769 }
1770
1771 /**
1772  * __audit_inode - store the inode and device from a lookup
1773  * @name: name being audited
1774  * @dentry: dentry being audited
1775  * @flags: attributes for this particular entry
1776  */
1777 void __audit_inode(struct filename *name, const struct dentry *dentry,
1778                    unsigned int flags)
1779 {
1780         struct audit_context *context = current->audit_context;
1781         const struct inode *inode = dentry->d_inode;
1782         struct audit_names *n;
1783         bool parent = flags & AUDIT_INODE_PARENT;
1784
1785         if (!context->in_syscall)
1786                 return;
1787
1788         if (!name)
1789                 goto out_alloc;
1790
1791 #if AUDIT_DEBUG
1792         /* The struct filename _must_ have a populated ->name */
1793         BUG_ON(!name->name);
1794 #endif
1795         /*
1796          * If we have a pointer to an audit_names entry already, then we can
1797          * just use it directly if the type is correct.
1798          */
1799         n = name->aname;
1800         if (n) {
1801                 if (parent) {
1802                         if (n->type == AUDIT_TYPE_PARENT ||
1803                             n->type == AUDIT_TYPE_UNKNOWN)
1804                                 goto out;
1805                 } else {
1806                         if (n->type != AUDIT_TYPE_PARENT)
1807                                 goto out;
1808                 }
1809         }
1810
1811         list_for_each_entry_reverse(n, &context->names_list, list) {
1812                 /* does the name pointer match? */
1813                 if (!n->name || n->name->name != name->name)
1814                         continue;
1815
1816                 /* match the correct record type */
1817                 if (parent) {
1818                         if (n->type == AUDIT_TYPE_PARENT ||
1819                             n->type == AUDIT_TYPE_UNKNOWN)
1820                                 goto out;
1821                 } else {
1822                         if (n->type != AUDIT_TYPE_PARENT)
1823                                 goto out;
1824                 }
1825         }
1826
1827 out_alloc:
1828         /* unable to find the name from a previous getname(). Allocate a new
1829          * anonymous entry.
1830          */
1831         n = audit_alloc_name(context, AUDIT_TYPE_NORMAL);
1832         if (!n)
1833                 return;
1834 out:
1835         if (parent) {
1836                 n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;
1837                 n->type = AUDIT_TYPE_PARENT;
1838                 if (flags & AUDIT_INODE_HIDDEN)
1839                         n->hidden = true;
1840         } else {
1841                 n->name_len = AUDIT_NAME_FULL;
1842                 n->type = AUDIT_TYPE_NORMAL;
1843         }
1844         handle_path(dentry);
1845         audit_copy_inode(n, dentry, inode);
1846 }
1847
1848 /**
1849  * __audit_inode_child - collect inode info for created/removed objects
1850  * @parent: inode of dentry parent
1851  * @dentry: dentry being audited
1852  * @type:   AUDIT_TYPE_* value that we're looking for
1853  *
1854  * For syscalls that create or remove filesystem objects, audit_inode
1855  * can only collect information for the filesystem object's parent.
1856  * This call updates the audit context with the child's information.
1857  * Syscalls that create a new filesystem object must be hooked after
1858  * the object is created.  Syscalls that remove a filesystem object
1859  * must be hooked prior, in order to capture the target inode during
1860  * unsuccessful attempts.
1861  */
1862 void __audit_inode_child(const struct inode *parent,
1863                          const struct dentry *dentry,
1864                          const unsigned char type)
1865 {
1866         struct audit_context *context = current->audit_context;
1867         const struct inode *inode = dentry->d_inode;
1868         const char *dname = dentry->d_name.name;
1869         struct audit_names *n, *found_parent = NULL, *found_child = NULL;
1870
1871         if (!context->in_syscall)
1872                 return;
1873
1874         if (inode)
1875                 handle_one(inode);
1876
1877         /* look for a parent entry first */
1878         list_for_each_entry(n, &context->names_list, list) {
1879                 if (!n->name || n->type != AUDIT_TYPE_PARENT)
1880                         continue;
1881
1882                 if (n->ino == parent->i_ino &&
1883                     !audit_compare_dname_path(dname, n->name->name, n->name_len)) {
1884                         found_parent = n;
1885                         break;
1886                 }
1887         }
1888
1889         /* is there a matching child entry? */
1890         list_for_each_entry(n, &context->names_list, list) {
1891                 /* can only match entries that have a name */
1892                 if (!n->name || n->type != type)
1893                         continue;
1894
1895                 /* if we found a parent, make sure this one is a child of it */
1896                 if (found_parent && (n->name != found_parent->name))
1897                         continue;
1898
1899                 if (!strcmp(dname, n->name->name) ||
1900                     !audit_compare_dname_path(dname, n->name->name,
1901                                                 found_parent ?
1902                                                 found_parent->name_len :
1903                                                 AUDIT_NAME_FULL)) {
1904                         found_child = n;
1905                         break;
1906                 }
1907         }
1908
1909         if (!found_parent) {
1910                 /* create a new, "anonymous" parent record */
1911                 n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
1912                 if (!n)
1913                         return;
1914                 audit_copy_inode(n, NULL, parent);
1915         }
1916
1917         if (!found_child) {
1918                 found_child = audit_alloc_name(context, type);
1919                 if (!found_child)
1920                         return;
1921
1922                 /* Re-use the name belonging to the slot for a matching parent
1923                  * directory. All names for this context are relinquished in
1924                  * audit_free_names() */
1925                 if (found_parent) {
1926                         found_child->name = found_parent->name;
1927                         found_child->name_len = AUDIT_NAME_FULL;
1928                         /* don't call __putname() */
1929                         found_child->name_put = false;
1930                 }
1931         }
1932         if (inode)
1933                 audit_copy_inode(found_child, dentry, inode);
1934         else
1935                 found_child->ino = (unsigned long)-1;
1936 }
1937 EXPORT_SYMBOL_GPL(__audit_inode_child);
1938
1939 /**
1940  * auditsc_get_stamp - get local copies of audit_context values
1941  * @ctx: audit_context for the task
1942  * @t: timespec to store time recorded in the audit_context
1943  * @serial: serial value that is recorded in the audit_context
1944  *
1945  * Also sets the context as auditable.
1946  */
1947 int auditsc_get_stamp(struct audit_context *ctx,
1948                        struct timespec *t, unsigned int *serial)
1949 {
1950         if (!ctx->in_syscall)
1951                 return 0;
1952         if (!ctx->serial)
1953                 ctx->serial = audit_serial();
1954         t->tv_sec  = ctx->ctime.tv_sec;
1955         t->tv_nsec = ctx->ctime.tv_nsec;
1956         *serial    = ctx->serial;
1957         if (!ctx->prio) {
1958                 ctx->prio = 1;
1959                 ctx->current_state = AUDIT_RECORD_CONTEXT;
1960         }
1961         return 1;
1962 }
1963
1964 /* global counter which is incremented every time something logs in */
1965 static atomic_t session_id = ATOMIC_INIT(0);
1966
1967 /**
1968  * audit_set_loginuid - set current task's audit_context loginuid
1969  * @loginuid: loginuid value
1970  *
1971  * Returns 0.
1972  *
1973  * Called (set) from fs/proc/base.c::proc_loginuid_write().
1974  */
1975 int audit_set_loginuid(kuid_t loginuid)
1976 {
1977         struct task_struct *task = current;
1978         struct audit_context *context = task->audit_context;
1979         unsigned int sessionid;
1980
1981 #ifdef CONFIG_AUDIT_LOGINUID_IMMUTABLE
1982         if (audit_loginuid_set(task))
1983                 return -EPERM;
1984 #else /* CONFIG_AUDIT_LOGINUID_IMMUTABLE */
1985         if (!capable(CAP_AUDIT_CONTROL))
1986                 return -EPERM;
1987 #endif  /* CONFIG_AUDIT_LOGINUID_IMMUTABLE */
1988
1989         sessionid = atomic_inc_return(&session_id);
1990         if (context && context->in_syscall) {
1991                 struct audit_buffer *ab;
1992
1993                 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
1994                 if (ab) {
1995                         audit_log_format(ab, "login pid=%d uid=%u "
1996                                 "old auid=%u new auid=%u"
1997                                 " old ses=%u new ses=%u",
1998                                 task->pid,
1999                                 from_kuid(&init_user_ns, task_uid(task)),
2000                                 from_kuid(&init_user_ns, task->loginuid),
2001                                 from_kuid(&init_user_ns, loginuid),
2002                                 task->sessionid, sessionid);
2003                         audit_log_end(ab);
2004                 }
2005         }
2006         task->sessionid = sessionid;
2007         task->loginuid = loginuid;
2008         return 0;
2009 }
2010
2011 /**
2012  * __audit_mq_open - record audit data for a POSIX MQ open
2013  * @oflag: open flag
2014  * @mode: mode bits
2015  * @attr: queue attributes
2016  *
2017  */
2018 void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
2019 {
2020         struct audit_context *context = current->audit_context;
2021
2022         if (attr)
2023                 memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr));
2024         else
2025                 memset(&context->mq_open.attr, 0, sizeof(struct mq_attr));
2026
2027         context->mq_open.oflag = oflag;
2028         context->mq_open.mode = mode;
2029
2030         context->type = AUDIT_MQ_OPEN;
2031 }
2032
2033 /**
2034  * __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive
2035  * @mqdes: MQ descriptor
2036  * @msg_len: Message length
2037  * @msg_prio: Message priority
2038  * @abs_timeout: Message timeout in absolute time
2039  *
2040  */
2041 void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
2042                         const struct timespec *abs_timeout)
2043 {
2044         struct audit_context *context = current->audit_context;
2045         struct timespec *p = &context->mq_sendrecv.abs_timeout;
2046
2047         if (abs_timeout)
2048                 memcpy(p, abs_timeout, sizeof(struct timespec));
2049         else
2050                 memset(p, 0, sizeof(struct timespec));
2051
2052         context->mq_sendrecv.mqdes = mqdes;
2053         context->mq_sendrecv.msg_len = msg_len;
2054         context->mq_sendrecv.msg_prio = msg_prio;
2055
2056         context->type = AUDIT_MQ_SENDRECV;
2057 }
2058
2059 /**
2060  * __audit_mq_notify - record audit data for a POSIX MQ notify
2061  * @mqdes: MQ descriptor
2062  * @notification: Notification event
2063  *
2064  */
2065
2066 void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
2067 {
2068         struct audit_context *context = current->audit_context;
2069
2070         if (notification)
2071                 context->mq_notify.sigev_signo = notification->sigev_signo;
2072         else
2073                 context->mq_notify.sigev_signo = 0;
2074
2075         context->mq_notify.mqdes = mqdes;
2076         context->type = AUDIT_MQ_NOTIFY;
2077 }
2078
2079 /**
2080  * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
2081  * @mqdes: MQ descriptor
2082  * @mqstat: MQ flags
2083  *
2084  */
2085 void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
2086 {
2087         struct audit_context *context = current->audit_context;
2088         context->mq_getsetattr.mqdes = mqdes;
2089         context->mq_getsetattr.mqstat = *mqstat;
2090         context->type = AUDIT_MQ_GETSETATTR;
2091 }
2092
2093 /**
2094  * audit_ipc_obj - record audit data for ipc object
2095  * @ipcp: ipc permissions
2096  *
2097  */
2098 void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
2099 {
2100         struct audit_context *context = current->audit_context;
2101         context->ipc.uid = ipcp->uid;
2102         context->ipc.gid = ipcp->gid;
2103         context->ipc.mode = ipcp->mode;
2104         context->ipc.has_perm = 0;
2105         security_ipc_getsecid(ipcp, &context->ipc.osid);
2106         context->type = AUDIT_IPC;
2107 }
2108
2109 /**
2110  * audit_ipc_set_perm - record audit data for new ipc permissions
2111  * @qbytes: msgq bytes
2112  * @uid: msgq user id
2113  * @gid: msgq group id
2114  * @mode: msgq mode (permissions)
2115  *
2116  * Called only after audit_ipc_obj().
2117  */
2118 void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
2119 {
2120         struct audit_context *context = current->audit_context;
2121
2122         context->ipc.qbytes = qbytes;
2123         context->ipc.perm_uid = uid;
2124         context->ipc.perm_gid = gid;
2125         context->ipc.perm_mode = mode;
2126         context->ipc.has_perm = 1;
2127 }
2128
2129 int __audit_bprm(struct linux_binprm *bprm)
2130 {
2131         struct audit_aux_data_execve *ax;
2132         struct audit_context *context = current->audit_context;
2133
2134         ax = kmalloc(sizeof(*ax), GFP_KERNEL);
2135         if (!ax)
2136                 return -ENOMEM;
2137
2138         ax->argc = bprm->argc;
2139         ax->envc = bprm->envc;
2140         ax->mm = bprm->mm;
2141         ax->d.type = AUDIT_EXECVE;
2142         ax->d.next = context->aux;
2143         context->aux = (void *)ax;
2144         return 0;
2145 }
2146
2147
2148 /**
2149  * audit_socketcall - record audit data for sys_socketcall
2150  * @nargs: number of args, which should not be more than AUDITSC_ARGS.
2151  * @args: args array
2152  *
2153  */
2154 int __audit_socketcall(int nargs, unsigned long *args)
2155 {
2156         struct audit_context *context = current->audit_context;
2157
2158         if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
2159                 return -EINVAL;
2160         context->type = AUDIT_SOCKETCALL;
2161         context->socketcall.nargs = nargs;
2162         memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
2163         return 0;
2164 }
2165
2166 /**
2167  * __audit_fd_pair - record audit data for pipe and socketpair
2168  * @fd1: the first file descriptor
2169  * @fd2: the second file descriptor
2170  *
2171  */
2172 void __audit_fd_pair(int fd1, int fd2)
2173 {
2174         struct audit_context *context = current->audit_context;
2175         context->fds[0] = fd1;
2176         context->fds[1] = fd2;
2177 }
2178
2179 /**
2180  * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
2181  * @len: data length in user space
2182  * @a: data address in kernel space
2183  *
2184  * Returns 0 for success or NULL context or < 0 on error.
2185  */
2186 int __audit_sockaddr(int len, void *a)
2187 {
2188         struct audit_context *context = current->audit_context;
2189
2190         if (!context->sockaddr) {
2191                 void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
2192                 if (!p)
2193                         return -ENOMEM;
2194                 context->sockaddr = p;
2195         }
2196
2197         context->sockaddr_len = len;
2198         memcpy(context->sockaddr, a, len);
2199         return 0;
2200 }
2201
2202 void __audit_ptrace(struct task_struct *t)
2203 {
2204         struct audit_context *context = current->audit_context;
2205
2206         context->target_pid = t->pid;
2207         context->target_auid = audit_get_loginuid(t);
2208         context->target_uid = task_uid(t);
2209         context->target_sessionid = audit_get_sessionid(t);
2210         security_task_getsecid(t, &context->target_sid);
2211         memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
2212 }
2213
2214 /**
2215  * audit_signal_info - record signal info for shutting down audit subsystem
2216  * @sig: signal value
2217  * @t: task being signaled
2218  *
2219  * If the audit subsystem is being terminated, record the task (pid)
2220  * and uid that is doing that.
2221  */
2222 int __audit_signal_info(int sig, struct task_struct *t)
2223 {
2224         struct audit_aux_data_pids *axp;
2225         struct task_struct *tsk = current;
2226         struct audit_context *ctx = tsk->audit_context;
2227         kuid_t uid = current_uid(), t_uid = task_uid(t);
2228
2229         if (audit_pid && t->tgid == audit_pid) {
2230                 if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
2231                         audit_sig_pid = tsk->pid;
2232                         if (uid_valid(tsk->loginuid))
2233                                 audit_sig_uid = tsk->loginuid;
2234                         else
2235                                 audit_sig_uid = uid;
2236                         security_task_getsecid(tsk, &audit_sig_sid);
2237                 }
2238                 if (!audit_signals || audit_dummy_context())
2239                         return 0;
2240         }
2241
2242         /* optimize the common case by putting first signal recipient directly
2243          * in audit_context */
2244         if (!ctx->target_pid) {
2245                 ctx->target_pid = t->tgid;
2246                 ctx->target_auid = audit_get_loginuid(t);
2247                 ctx->target_uid = t_uid;
2248                 ctx->target_sessionid = audit_get_sessionid(t);
2249                 security_task_getsecid(t, &ctx->target_sid);
2250                 memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
2251                 return 0;
2252         }
2253
2254         axp = (void *)ctx->aux_pids;
2255         if (!axp || axp->pid_count == AUDIT_AUX_PIDS) {
2256                 axp = kzalloc(sizeof(*axp), GFP_ATOMIC);
2257                 if (!axp)
2258                         return -ENOMEM;
2259
2260                 axp->d.type = AUDIT_OBJ_PID;
2261                 axp->d.next = ctx->aux_pids;
2262                 ctx->aux_pids = (void *)axp;
2263         }
2264         BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
2265
2266         axp->target_pid[axp->pid_count] = t->tgid;
2267         axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
2268         axp->target_uid[axp->pid_count] = t_uid;
2269         axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
2270         security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
2271         memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
2272         axp->pid_count++;
2273
2274         return 0;
2275 }
2276
2277 /**
2278  * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
2279  * @bprm: pointer to the bprm being processed
2280  * @new: the proposed new credentials
2281  * @old: the old credentials
2282  *
2283  * Simply check if the proc already has the caps given by the file and if not
2284  * store the priv escalation info for later auditing at the end of the syscall
2285  *
2286  * -Eric
2287  */
2288 int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
2289                            const struct cred *new, const struct cred *old)
2290 {
2291         struct audit_aux_data_bprm_fcaps *ax;
2292         struct audit_context *context = current->audit_context;
2293         struct cpu_vfs_cap_data vcaps;
2294         struct dentry *dentry;
2295
2296         ax = kmalloc(sizeof(*ax), GFP_KERNEL);
2297         if (!ax)
2298                 return -ENOMEM;
2299
2300         ax->d.type = AUDIT_BPRM_FCAPS;
2301         ax->d.next = context->aux;
2302         context->aux = (void *)ax;
2303
2304         dentry = dget(bprm->file->f_dentry);
2305         get_vfs_caps_from_disk(dentry, &vcaps);
2306         dput(dentry);
2307
2308         ax->fcap.permitted = vcaps.permitted;
2309         ax->fcap.inheritable = vcaps.inheritable;
2310         ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2311         ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
2312
2313         ax->old_pcap.permitted   = old->cap_permitted;
2314         ax->old_pcap.inheritable = old->cap_inheritable;
2315         ax->old_pcap.effective   = old->cap_effective;
2316
2317         ax->new_pcap.permitted   = new->cap_permitted;
2318         ax->new_pcap.inheritable = new->cap_inheritable;
2319         ax->new_pcap.effective   = new->cap_effective;
2320         return 0;
2321 }
2322
2323 /**
2324  * __audit_log_capset - store information about the arguments to the capset syscall
2325  * @pid: target pid of the capset call
2326  * @new: the new credentials
2327  * @old: the old (current) credentials
2328  *
2329  * Record the aguments userspace sent to sys_capset for later printing by the
2330  * audit system if applicable
2331  */
2332 void __audit_log_capset(pid_t pid,
2333                        const struct cred *new, const struct cred *old)
2334 {
2335         struct audit_context *context = current->audit_context;
2336         context->capset.pid = pid;
2337         context->capset.cap.effective   = new->cap_effective;
2338         context->capset.cap.inheritable = new->cap_effective;
2339         context->capset.cap.permitted   = new->cap_permitted;
2340         context->type = AUDIT_CAPSET;
2341 }
2342
2343 void __audit_mmap_fd(int fd, int flags)
2344 {
2345         struct audit_context *context = current->audit_context;
2346         context->mmap.fd = fd;
2347         context->mmap.flags = flags;
2348         context->type = AUDIT_MMAP;
2349 }
2350
2351 static void audit_log_task(struct audit_buffer *ab)
2352 {
2353         kuid_t auid, uid;
2354         kgid_t gid;
2355         unsigned int sessionid;
2356
2357         auid = audit_get_loginuid(current);
2358         sessionid = audit_get_sessionid(current);
2359         current_uid_gid(&uid, &gid);
2360
2361         audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
2362                          from_kuid(&init_user_ns, auid),
2363                          from_kuid(&init_user_ns, uid),
2364                          from_kgid(&init_user_ns, gid),
2365                          sessionid);
2366         audit_log_task_context(ab);
2367         audit_log_format(ab, " pid=%d comm=", current->pid);
2368         audit_log_untrustedstring(ab, current->comm);
2369 }
2370
2371 static void audit_log_abend(struct audit_buffer *ab, char *reason, long signr)
2372 {
2373         audit_log_task(ab);
2374         audit_log_format(ab, " reason=");
2375         audit_log_string(ab, reason);
2376         audit_log_format(ab, " sig=%ld", signr);
2377 }
2378 /**
2379  * audit_core_dumps - record information about processes that end abnormally
2380  * @signr: signal value
2381  *
2382  * If a process ends with a core dump, something fishy is going on and we
2383  * should record the event for investigation.
2384  */
2385 void audit_core_dumps(long signr)
2386 {
2387         struct audit_buffer *ab;
2388
2389         if (!audit_enabled)
2390                 return;
2391
2392         if (signr == SIGQUIT)   /* don't care for those */
2393                 return;
2394
2395         ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
2396         if (unlikely(!ab))
2397                 return;
2398         audit_log_abend(ab, "memory violation", signr);
2399         audit_log_end(ab);
2400 }
2401
2402 void __audit_seccomp(unsigned long syscall, long signr, int code)
2403 {
2404         struct audit_buffer *ab;
2405
2406         ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_SECCOMP);
2407         if (unlikely(!ab))
2408                 return;
2409         audit_log_task(ab);
2410         audit_log_format(ab, " sig=%ld", signr);
2411         audit_log_format(ab, " syscall=%ld", syscall);
2412         audit_log_format(ab, " compat=%d", is_compat_task());
2413         audit_log_format(ab, " ip=0x%lx", KSTK_EIP(current));
2414         audit_log_format(ab, " code=0x%x", code);
2415         audit_log_end(ab);
2416 }
2417
2418 struct list_head *audit_killed_trees(void)
2419 {
2420         struct audit_context *ctx = current->audit_context;
2421         if (likely(!ctx || !ctx->in_syscall))
2422                 return NULL;
2423         return &ctx->killed_trees;
2424 }