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 <asm/atomic.h>
  48 #include <asm/types.h>
  49 #include <linux/fs.h>
  50 #include <linux/namei.h>
  51 #include <linux/mm.h>
  52 #include <linux/module.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/selinux.h>
  66 #include <linux/binfmts.h>
  67 #include <linux/syscalls.h>
  68
  69 #include "audit.h"
  70
  71 extern struct list_head audit_filter_list[];
  72
  73 /* No syscall auditing will take place unless audit_enabled != 0. */
  74 extern int audit_enabled;
  75
  76 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
  77  * for saving names from getname(). */
  78 #define AUDIT_NAMES    20
  79
  80 /* AUDIT_NAMES_RESERVED is the number of slots we reserve in the
  81  * audit_context from being used for nameless inodes from
  82  * path_lookup. */
  83 #define AUDIT_NAMES_RESERVED 7
  84
  85 /* Indicates that audit should log the full pathname. */
  86 #define AUDIT_NAME_FULL -1
  87
  88 /* number of audit rules */
  89 int audit_n_rules;
  90
  91 /* When fs/namei.c:getname() is called, we store the pointer in name and
  92  * we don't let putname() free it (instead we free all of the saved
  93  * pointers at syscall exit time).
  94  *
  95  * Further, in fs/namei.c:path_lookup() we store the inode and device. */
  96 struct audit_names {
  97         const char      *name;
  98         int             name_len;       /* number of name's characters to log */
  99         unsigned        name_put;       /* call __putname() for this name */
 100         unsigned long   ino;
 101         dev_t           dev;
 102         umode_t         mode;
 103         uid_t           uid;
 104         gid_t           gid;
 105         dev_t           rdev;
 106         u32             osid;
 107 };
 108
 109 struct audit_aux_data {
 110         struct audit_aux_data   *next;
 111         int                     type;
 112 };
 113
 114 #define AUDIT_AUX_IPCPERM       0
 115
 116 struct audit_aux_data_mq_open {
 117         struct audit_aux_data   d;
 118         int                     oflag;
 119         mode_t                  mode;
 120         struct mq_attr          attr;
 121 };
 122
 123 struct audit_aux_data_mq_sendrecv {
 124         struct audit_aux_data   d;
 125         mqd_t                   mqdes;
 126         size_t                  msg_len;
 127         unsigned int            msg_prio;
 128         struct timespec         abs_timeout;
 129 };
 130
 131 struct audit_aux_data_mq_notify {
 132         struct audit_aux_data   d;
 133         mqd_t                   mqdes;
 134         struct sigevent         notification;
 135 };
 136
 137 struct audit_aux_data_mq_getsetattr {
 138         struct audit_aux_data   d;
 139         mqd_t                   mqdes;
 140         struct mq_attr          mqstat;
 141 };
 142
 143 struct audit_aux_data_ipcctl {
 144         struct audit_aux_data   d;
 145         struct ipc_perm         p;
 146         unsigned long           qbytes;
 147         uid_t                   uid;
 148         gid_t                   gid;
 149         mode_t                  mode;
 150         u32                     osid;
 151 };
 152
 153 struct audit_aux_data_execve {
 154         struct audit_aux_data   d;
 155         int argc;
 156         int envc;
 157         char mem[0];
 158 };
 159
 160 struct audit_aux_data_socketcall {
 161         struct audit_aux_data   d;
 162         int                     nargs;
 163         unsigned long           args[0];
 164 };
 165
 166 struct audit_aux_data_sockaddr {
 167         struct audit_aux_data   d;
 168         int                     len;
 169         char                    a[0];
 170 };
 171
 172 struct audit_aux_data_path {
 173         struct audit_aux_data   d;
 174         struct dentry           *dentry;
 175         struct vfsmount         *mnt;
 176 };
 177
 178 /* The per-task audit context. */
 179 struct audit_context {
 180         int                 dummy;      /* must be the first element */
 181         int                 in_syscall; /* 1 if task is in a syscall */
 182         enum audit_state    state;
 183         unsigned int        serial;     /* serial number for record */
 184         struct timespec     ctime;      /* time of syscall entry */
 185         uid_t               loginuid;   /* login uid (identity) */
 186         int                 major;      /* syscall number */
 187         unsigned long       argv[4];    /* syscall arguments */
 188         int                 return_valid; /* return code is valid */
 189         long                return_code;/* syscall return code */
 190         int                 auditable;  /* 1 if record should be written */
 191         int                 name_count;
 192         struct audit_names  names[AUDIT_NAMES];
 193         char *              filterkey;  /* key for rule that triggered record */
 194         struct dentry *     pwd;
 195         struct vfsmount *   pwdmnt;
 196         struct audit_context *previous; /* For nested syscalls */
 197         struct audit_aux_data *aux;
 198
 199                                 /* Save things to print about task_struct */
 200         pid_t               pid, ppid;
 201         uid_t               uid, euid, suid, fsuid;
 202         gid_t               gid, egid, sgid, fsgid;
 203         unsigned long       personality;
 204         int                 arch;
 205
 206 #if AUDIT_DEBUG
 207         int                 put_count;
 208         int                 ino_count;
 209 #endif
 210 };
 211
 212 /* Determine if any context name data matches a rule's watch data */
 213 /* Compare a task_struct with an audit_rule.  Return 1 on match, 0
 214  * otherwise. */
 215 static int audit_filter_rules(struct task_struct *tsk,
 216                               struct audit_krule *rule,
 217                               struct audit_context *ctx,
 218                               struct audit_names *name,
 219                               enum audit_state *state)
 220 {
 221         int i, j, need_sid = 1;
 222         u32 sid;
 223
 224         for (i = 0; i < rule->field_count; i++) {
 225                 struct audit_field *f = &rule->fields[i];
 226                 int result = 0;
 227
 228                 switch (f->type) {
 229                 case AUDIT_PID:
 230                         result = audit_comparator(tsk->pid, f->op, f->val);
 231                         break;
 232                 case AUDIT_PPID:
 233                         if (ctx)
 234                                 result = audit_comparator(ctx->ppid, f->op, f->val);
 235                         break;
 236                 case AUDIT_UID:
 237                         result = audit_comparator(tsk->uid, f->op, f->val);
 238                         break;
 239                 case AUDIT_EUID:
 240                         result = audit_comparator(tsk->euid, f->op, f->val);
 241                         break;
 242                 case AUDIT_SUID:
 243                         result = audit_comparator(tsk->suid, f->op, f->val);
 244                         break;
 245                 case AUDIT_FSUID:
 246                         result = audit_comparator(tsk->fsuid, f->op, f->val);
 247                         break;
 248                 case AUDIT_GID:
 249                         result = audit_comparator(tsk->gid, f->op, f->val);
 250                         break;
 251                 case AUDIT_EGID:
 252                         result = audit_comparator(tsk->egid, f->op, f->val);
 253                         break;
 254                 case AUDIT_SGID:
 255                         result = audit_comparator(tsk->sgid, f->op, f->val);
 256                         break;
 257                 case AUDIT_FSGID:
 258                         result = audit_comparator(tsk->fsgid, f->op, f->val);
 259                         break;
 260                 case AUDIT_PERS:
 261                         result = audit_comparator(tsk->personality, f->op, f->val);
 262                         break;
 263                 case AUDIT_ARCH:
 264                         if (ctx)
 265                                 result = audit_comparator(ctx->arch, f->op, f->val);
 266                         break;
 267
 268                 case AUDIT_EXIT:
 269                         if (ctx && ctx->return_valid)
 270                                 result = audit_comparator(ctx->return_code, f->op, f->val);
 271                         break;
 272                 case AUDIT_SUCCESS:
 273                         if (ctx && ctx->return_valid) {
 274                                 if (f->val)
 275                                         result = audit_comparator(ctx->return_valid, f->op, AUDITSC_SUCCESS);
 276                                 else
 277                                         result = audit_comparator(ctx->return_valid, f->op, AUDITSC_FAILURE);
 278                         }
 279                         break;
 280                 case AUDIT_DEVMAJOR:
 281                         if (name)
 282                                 result = audit_comparator(MAJOR(name->dev),
 283                                                           f->op, f->val);
 284                         else if (ctx) {
 285                                 for (j = 0; j < ctx->name_count; j++) {
 286                                         if (audit_comparator(MAJOR(ctx->names[j].dev),  f->op, f->val)) {
 287                                                 ++result;
 288                                                 break;
 289                                         }
 290                                 }
 291                         }
 292                         break;
 293                 case AUDIT_DEVMINOR:
 294                         if (name)
 295                                 result = audit_comparator(MINOR(name->dev),
 296                                                           f->op, f->val);
 297                         else if (ctx) {
 298                                 for (j = 0; j < ctx->name_count; j++) {
 299                                         if (audit_comparator(MINOR(ctx->names[j].dev), f->op, f->val)) {
 300                                                 ++result;
 301                                                 break;
 302                                         }
 303                                 }
 304                         }
 305                         break;
 306                 case AUDIT_INODE:
 307                         if (name)
 308                                 result = (name->ino == f->val);
 309                         else if (ctx) {
 310                                 for (j = 0; j < ctx->name_count; j++) {
 311                                         if (audit_comparator(ctx->names[j].ino, f->op, f->val)) {
 312                                                 ++result;
 313                                                 break;
 314                                         }
 315                                 }
 316                         }
 317                         break;
 318                 case AUDIT_WATCH:
 319                         if (name && rule->watch->ino != (unsigned long)-1)
 320                                 result = (name->dev == rule->watch->dev &&
 321                                           name->ino == rule->watch->ino);
 322                         break;
 323                 case AUDIT_LOGINUID:
 324                         result = 0;
 325                         if (ctx)
 326                                 result = audit_comparator(ctx->loginuid, f->op, f->val);
 327                         break;
 328                 case AUDIT_SUBJ_USER:
 329                 case AUDIT_SUBJ_ROLE:
 330                 case AUDIT_SUBJ_TYPE:
 331                 case AUDIT_SUBJ_SEN:
 332                 case AUDIT_SUBJ_CLR:
 333                         /* NOTE: this may return negative values indicating
 334                            a temporary error.  We simply treat this as a
 335                            match for now to avoid losing information that
 336                            may be wanted.   An error message will also be
 337                            logged upon error */
 338                         if (f->se_rule) {
 339                                 if (need_sid) {
 340                                         selinux_task_ctxid(tsk, &sid);
 341                                         need_sid = 0;
 342                                 }
 343                                 result = selinux_audit_rule_match(sid, f->type,
 344                                                                   f->op,
 345                                                                   f->se_rule,
 346                                                                   ctx);
 347                         }
 348                         break;
 349                 case AUDIT_OBJ_USER:
 350                 case AUDIT_OBJ_ROLE:
 351                 case AUDIT_OBJ_TYPE:
 352                 case AUDIT_OBJ_LEV_LOW:
 353                 case AUDIT_OBJ_LEV_HIGH:
 354                         /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR
 355                            also applies here */
 356                         if (f->se_rule) {
 357                                 /* Find files that match */
 358                                 if (name) {
 359                                         result = selinux_audit_rule_match(
 360                                                    name->osid, f->type, f->op,
 361                                                    f->se_rule, ctx);
 362                                 } else if (ctx) {
 363                                         for (j = 0; j < ctx->name_count; j++) {
 364                                                 if (selinux_audit_rule_match(
 365                                                       ctx->names[j].osid,
 366                                                       f->type, f->op,
 367                                                       f->se_rule, ctx)) {
 368                                                         ++result;
 369                                                         break;
 370                                                 }
 371                                         }
 372                                 }
 373                                 /* Find ipc objects that match */
 374                                 if (ctx) {
 375                                         struct audit_aux_data *aux;
 376                                         for (aux = ctx->aux; aux;
 377                                              aux = aux->next) {
 378                                                 if (aux->type == AUDIT_IPC) {
 379                                                         struct audit_aux_data_ipcctl *axi = (void *)aux;
 380                                                         if (selinux_audit_rule_match(axi->osid, f->type, f->op, f->se_rule, ctx)) {
 381                                                                 ++result;
 382                                                                 break;
 383                                                         }
 384                                                 }
 385                                         }
 386                                 }
 387                         }
 388                         break;
 389                 case AUDIT_ARG0:
 390                 case AUDIT_ARG1:
 391                 case AUDIT_ARG2:
 392                 case AUDIT_ARG3:
 393                         if (ctx)
 394                                 result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
 395                         break;
 396                 case AUDIT_FILTERKEY:
 397                         /* ignore this field for filtering */
 398                         result = 1;
 399                         break;
 400                 }
 401
 402                 if (!result)
 403                         return 0;
 404         }
 405         if (rule->filterkey)
 406                 ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
 407         switch (rule->action) {
 408         case AUDIT_NEVER:    *state = AUDIT_DISABLED;       break;
 409         case AUDIT_ALWAYS:   *state = AUDIT_RECORD_CONTEXT; break;
 410         }
 411         return 1;
 412 }
 413
 414 /* At process creation time, we can determine if system-call auditing is
 415  * completely disabled for this task.  Since we only have the task
 416  * structure at this point, we can only check uid and gid.
 417  */
 418 static enum audit_state audit_filter_task(struct task_struct *tsk)
 419 {
 420         struct audit_entry *e;
 421         enum audit_state   state;
 422
 423         rcu_read_lock();
 424         list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TASK], list) {
 425                 if (audit_filter_rules(tsk, &e->rule, NULL, NULL, &state)) {
 426                         rcu_read_unlock();
 427                         return state;
 428                 }
 429         }
 430         rcu_read_unlock();
 431         return AUDIT_BUILD_CONTEXT;
 432 }
 433
 434 /* At syscall entry and exit time, this filter is called if the
 435  * audit_state is not low enough that auditing cannot take place, but is
 436  * also not high enough that we already know we have to write an audit
 437  * record (i.e., the state is AUDIT_SETUP_CONTEXT or AUDIT_BUILD_CONTEXT).
 438  */
 439 static enum audit_state audit_filter_syscall(struct task_struct *tsk,
 440                                              struct audit_context *ctx,
 441                                              struct list_head *list)
 442 {
 443         struct audit_entry *e;
 444         enum audit_state state;
 445
 446         if (audit_pid && tsk->tgid == audit_pid)
 447                 return AUDIT_DISABLED;
 448
 449         rcu_read_lock();
 450         if (!list_empty(list)) {
 451                 int word = AUDIT_WORD(ctx->major);
 452                 int bit  = AUDIT_BIT(ctx->major);
 453
 454                 list_for_each_entry_rcu(e, list, list) {
 455                         if ((e->rule.mask[word] & bit) == bit &&
 456                             audit_filter_rules(tsk, &e->rule, ctx, NULL,
 457                                                &state)) {
 458                                 rcu_read_unlock();
 459                                 return state;
 460                         }
 461                 }
 462         }
 463         rcu_read_unlock();
 464         return AUDIT_BUILD_CONTEXT;
 465 }
 466
 467 /* At syscall exit time, this filter is called if any audit_names[] have been
 468  * collected during syscall processing.  We only check rules in sublists at hash
 469  * buckets applicable to the inode numbers in audit_names[].
 470  * Regarding audit_state, same rules apply as for audit_filter_syscall().
 471  */
 472 enum audit_state audit_filter_inodes(struct task_struct *tsk,
 473                                      struct audit_context *ctx)
 474 {
 475         int i;
 476         struct audit_entry *e;
 477         enum audit_state state;
 478
 479         if (audit_pid && tsk->tgid == audit_pid)
 480                 return AUDIT_DISABLED;
 481
 482         rcu_read_lock();
 483         for (i = 0; i < ctx->name_count; i++) {
 484                 int word = AUDIT_WORD(ctx->major);
 485                 int bit  = AUDIT_BIT(ctx->major);
 486                 struct audit_names *n = &ctx->names[i];
 487                 int h = audit_hash_ino((u32)n->ino);
 488                 struct list_head *list = &audit_inode_hash[h];
 489
 490                 if (list_empty(list))
 491                         continue;
 492
 493                 list_for_each_entry_rcu(e, list, list) {
 494                         if ((e->rule.mask[word] & bit) == bit &&
 495                             audit_filter_rules(tsk, &e->rule, ctx, n, &state)) {
 496                                 rcu_read_unlock();
 497                                 return state;
 498                         }
 499                 }
 500         }
 501         rcu_read_unlock();
 502         return AUDIT_BUILD_CONTEXT;
 503 }
 504
 505 void audit_set_auditable(struct audit_context *ctx)
 506 {
 507         ctx->auditable = 1;
 508 }
 509
 510 static inline struct audit_context *audit_get_context(struct task_struct *tsk,
 511                                                       int return_valid,
 512                                                       int return_code)
 513 {
 514         struct audit_context *context = tsk->audit_context;
 515
 516         if (likely(!context))
 517                 return NULL;
 518         context->return_valid = return_valid;
 519         context->return_code  = return_code;
 520
 521         if (context->in_syscall && !context->dummy && !context->auditable) {
 522                 enum audit_state state;
 523
 524                 state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_EXIT]);
 525                 if (state == AUDIT_RECORD_CONTEXT) {
 526                         context->auditable = 1;
 527                         goto get_context;
 528                 }
 529
 530                 state = audit_filter_inodes(tsk, context);
 531                 if (state == AUDIT_RECORD_CONTEXT)
 532                         context->auditable = 1;
 533
 534         }
 535
 536 get_context:
 537
 538         tsk->audit_context = NULL;
 539         return context;
 540 }
 541
 542 static inline void audit_free_names(struct audit_context *context)
 543 {
 544         int i;
 545
 546 #if AUDIT_DEBUG == 2
 547         if (context->auditable
 548             ||context->put_count + context->ino_count != context->name_count) {
 549                 printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d"
 550                        " name_count=%d put_count=%d"
 551                        " ino_count=%d [NOT freeing]\n",
 552                        __FILE__, __LINE__,
 553                        context->serial, context->major, context->in_syscall,
 554                        context->name_count, context->put_count,
 555                        context->ino_count);
 556                 for (i = 0; i < context->name_count; i++) {
 557                         printk(KERN_ERR "names[%d] = %p = %s\n", i,
 558                                context->names[i].name,
 559                                context->names[i].name ?: "(null)");
 560                 }
 561                 dump_stack();
 562                 return;
 563         }
 564 #endif
 565 #if AUDIT_DEBUG
 566         context->put_count  = 0;
 567         context->ino_count  = 0;
 568 #endif
 569
 570         for (i = 0; i < context->name_count; i++) {
 571                 if (context->names[i].name && context->names[i].name_put)
 572                         __putname(context->names[i].name);
 573         }
 574         context->name_count = 0;
 575         if (context->pwd)
 576                 dput(context->pwd);
 577         if (context->pwdmnt)
 578                 mntput(context->pwdmnt);
 579         context->pwd = NULL;
 580         context->pwdmnt = NULL;
 581 }
 582
 583 static inline void audit_free_aux(struct audit_context *context)
 584 {
 585         struct audit_aux_data *aux;
 586
 587         while ((aux = context->aux)) {
 588                 if (aux->type == AUDIT_AVC_PATH) {
 589                         struct audit_aux_data_path *axi = (void *)aux;
 590                         dput(axi->dentry);
 591                         mntput(axi->mnt);
 592                 }
 593
 594                 context->aux = aux->next;
 595                 kfree(aux);
 596         }
 597 }
 598
 599 static inline void audit_zero_context(struct audit_context *context,
 600                                       enum audit_state state)
 601 {
 602         uid_t loginuid = context->loginuid;
 603
 604         memset(context, 0, sizeof(*context));
 605         context->state      = state;
 606         context->loginuid   = loginuid;
 607 }
 608
 609 static inline struct audit_context *audit_alloc_context(enum audit_state state)
 610 {
 611         struct audit_context *context;
 612
 613         if (!(context = kmalloc(sizeof(*context), GFP_KERNEL)))
 614                 return NULL;
 615         audit_zero_context(context, state);
 616         return context;
 617 }
 618
 619 /**
 620  * audit_alloc - allocate an audit context block for a task
 621  * @tsk: task
 622  *
 623  * Filter on the task information and allocate a per-task audit context
 624  * if necessary.  Doing so turns on system call auditing for the
 625  * specified task.  This is called from copy_process, so no lock is
 626  * needed.
 627  */
 628 int audit_alloc(struct task_struct *tsk)
 629 {
 630         struct audit_context *context;
 631         enum audit_state     state;
 632
 633         if (likely(!audit_enabled))
 634                 return 0; /* Return if not auditing. */
 635
 636         state = audit_filter_task(tsk);
 637         if (likely(state == AUDIT_DISABLED))
 638                 return 0;
 639
 640         if (!(context = audit_alloc_context(state))) {
 641                 audit_log_lost("out of memory in audit_alloc");
 642                 return -ENOMEM;
 643         }
 644
 645                                 /* Preserve login uid */
 646         context->loginuid = -1;
 647         if (current->audit_context)
 648                 context->loginuid = current->audit_context->loginuid;
 649
 650         tsk->audit_context  = context;
 651         set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
 652         return 0;
 653 }
 654
 655 static inline void audit_free_context(struct audit_context *context)
 656 {
 657         struct audit_context *previous;
 658         int                  count = 0;
 659
 660         do {
 661                 previous = context->previous;
 662                 if (previous || (count &&  count < 10)) {
 663                         ++count;
 664                         printk(KERN_ERR "audit(:%d): major=%d name_count=%d:"
 665                                " freeing multiple contexts (%d)\n",
 666                                context->serial, context->major,
 667                                context->name_count, count);
 668                 }
 669                 audit_free_names(context);
 670                 audit_free_aux(context);
 671                 kfree(context->filterkey);
 672                 kfree(context);
 673                 context  = previous;
 674         } while (context);
 675         if (count >= 10)
 676                 printk(KERN_ERR "audit: freed %d contexts\n", count);
 677 }
 678
 679 static void audit_log_task_context(struct audit_buffer *ab)
 680 {
 681         char *ctx = NULL;
 682         ssize_t len = 0;
 683
 684         len = security_getprocattr(current, "current", NULL, 0);
 685         if (len < 0) {
 686                 if (len != -EINVAL)
 687                         goto error_path;
 688                 return;
 689         }
 690
 691         ctx = kmalloc(len, GFP_KERNEL);
 692         if (!ctx)
 693                 goto error_path;
 694
 695         len = security_getprocattr(current, "current", ctx, len);
 696         if (len < 0 )
 697                 goto error_path;
 698
 699         audit_log_format(ab, " subj=%s", ctx);
 700         return;
 701
 702 error_path:
 703         kfree(ctx);
 704         audit_panic("error in audit_log_task_context");
 705         return;
 706 }
 707
 708 static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
 709 {
 710         char name[sizeof(tsk->comm)];
 711         struct mm_struct *mm = tsk->mm;
 712         struct vm_area_struct *vma;
 713
 714         /* tsk == current */
 715
 716         get_task_comm(name, tsk);
 717         audit_log_format(ab, " comm=");
 718         audit_log_untrustedstring(ab, name);
 719
 720         if (mm) {
 721                 down_read(&mm->mmap_sem);
 722                 vma = mm->mmap;
 723                 while (vma) {
 724                         if ((vma->vm_flags & VM_EXECUTABLE) &&
 725                             vma->vm_file) {
 726                                 audit_log_d_path(ab, "exe=",
 727                                                  vma->vm_file->f_dentry,
 728                                                  vma->vm_file->f_vfsmnt);
 729                                 break;
 730                         }
 731                         vma = vma->vm_next;
 732                 }
 733                 up_read(&mm->mmap_sem);
 734         }
 735         audit_log_task_context(ab);
 736 }
 737
 738 static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
 739 {
 740         int i, call_panic = 0;
 741         struct audit_buffer *ab;
 742         struct audit_aux_data *aux;
 743         const char *tty;
 744
 745         /* tsk == current */
 746         context->pid = tsk->pid;
 747         context->ppid = sys_getppid();  /* sic.  tsk == current in all cases */
 748         context->uid = tsk->uid;
 749         context->gid = tsk->gid;
 750         context->euid = tsk->euid;
 751         context->suid = tsk->suid;
 752         context->fsuid = tsk->fsuid;
 753         context->egid = tsk->egid;
 754         context->sgid = tsk->sgid;
 755         context->fsgid = tsk->fsgid;
 756         context->personality = tsk->personality;
 757
 758         ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
 759         if (!ab)
 760                 return;         /* audit_panic has been called */
 761         audit_log_format(ab, "arch=%x syscall=%d",
 762                          context->arch, context->major);
 763         if (context->personality != PER_LINUX)
 764                 audit_log_format(ab, " per=%lx", context->personality);
 765         if (context->return_valid)
 766                 audit_log_format(ab, " success=%s exit=%ld",
 767                                  (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
 768                                  context->return_code);
 769         if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name)
 770                 tty = tsk->signal->tty->name;
 771         else
 772                 tty = "(none)";
 773         audit_log_format(ab,
 774                   " a0=%lx a1=%lx a2=%lx a3=%lx items=%d"
 775                   " ppid=%d pid=%d auid=%u uid=%u gid=%u"
 776                   " euid=%u suid=%u fsuid=%u"
 777                   " egid=%u sgid=%u fsgid=%u tty=%s",
 778                   context->argv[0],
 779                   context->argv[1],
 780                   context->argv[2],
 781                   context->argv[3],
 782                   context->name_count,
 783                   context->ppid,
 784                   context->pid,
 785                   context->loginuid,
 786                   context->uid,
 787                   context->gid,
 788                   context->euid, context->suid, context->fsuid,
 789                   context->egid, context->sgid, context->fsgid, tty);
 790         audit_log_task_info(ab, tsk);
 791         if (context->filterkey) {
 792                 audit_log_format(ab, " key=");
 793                 audit_log_untrustedstring(ab, context->filterkey);
 794         } else
 795                 audit_log_format(ab, " key=(null)");
 796         audit_log_end(ab);
 797
 798         for (aux = context->aux; aux; aux = aux->next) {
 799
 800                 ab = audit_log_start(context, GFP_KERNEL, aux->type);
 801                 if (!ab)
 802                         continue; /* audit_panic has been called */
 803
 804                 switch (aux->type) {
 805                 case AUDIT_MQ_OPEN: {
 806                         struct audit_aux_data_mq_open *axi = (void *)aux;
 807                         audit_log_format(ab,
 808                                 "oflag=0x%x mode=%#o mq_flags=0x%lx mq_maxmsg=%ld "
 809                                 "mq_msgsize=%ld mq_curmsgs=%ld",
 810                                 axi->oflag, axi->mode, axi->attr.mq_flags,
 811                                 axi->attr.mq_maxmsg, axi->attr.mq_msgsize,
 812                                 axi->attr.mq_curmsgs);
 813                         break; }
 814
 815                 case AUDIT_MQ_SENDRECV: {
 816                         struct audit_aux_data_mq_sendrecv *axi = (void *)aux;
 817                         audit_log_format(ab,
 818                                 "mqdes=%d msg_len=%zd msg_prio=%u "
 819                                 "abs_timeout_sec=%ld abs_timeout_nsec=%ld",
 820                                 axi->mqdes, axi->msg_len, axi->msg_prio,
 821                                 axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec);
 822                         break; }
 823
 824                 case AUDIT_MQ_NOTIFY: {
 825                         struct audit_aux_data_mq_notify *axi = (void *)aux;
 826                         audit_log_format(ab,
 827                                 "mqdes=%d sigev_signo=%d",
 828                                 axi->mqdes,
 829                                 axi->notification.sigev_signo);
 830                         break; }
 831
 832                 case AUDIT_MQ_GETSETATTR: {
 833                         struct audit_aux_data_mq_getsetattr *axi = (void *)aux;
 834                         audit_log_format(ab,
 835                                 "mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
 836                                 "mq_curmsgs=%ld ",
 837                                 axi->mqdes,
 838                                 axi->mqstat.mq_flags, axi->mqstat.mq_maxmsg,
 839                                 axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs);
 840                         break; }
 841
 842                 case AUDIT_IPC: {
 843                         struct audit_aux_data_ipcctl *axi = (void *)aux;
 844                         audit_log_format(ab,
 845                                  "ouid=%u ogid=%u mode=%x",
 846                                  axi->uid, axi->gid, axi->mode);
 847                         if (axi->osid != 0) {
 848                                 char *ctx = NULL;
 849                                 u32 len;
 850                                 if (selinux_ctxid_to_string(
 851                                                 axi->osid, &ctx, &len)) {
 852                                         audit_log_format(ab, " osid=%u",
 853                                                         axi->osid);
 854                                         call_panic = 1;
 855                                 } else
 856                                         audit_log_format(ab, " obj=%s", ctx);
 857                                 kfree(ctx);
 858                         }
 859                         break; }
 860
 861                 case AUDIT_IPC_SET_PERM: {
 862                         struct audit_aux_data_ipcctl *axi = (void *)aux;
 863                         audit_log_format(ab,
 864                                 "qbytes=%lx ouid=%u ogid=%u mode=%x",
 865                                 axi->qbytes, axi->uid, axi->gid, axi->mode);
 866                         break; }
 867
 868                 case AUDIT_EXECVE: {
 869                         struct audit_aux_data_execve *axi = (void *)aux;
 870                         int i;
 871                         const char *p;
 872                         for (i = 0, p = axi->mem; i < axi->argc; i++) {
 873                                 audit_log_format(ab, "a%d=", i);
 874                                 p = audit_log_untrustedstring(ab, p);
 875                                 audit_log_format(ab, "\n");
 876                         }
 877                         break; }
 878
 879                 case AUDIT_SOCKETCALL: {
 880                         int i;
 881                         struct audit_aux_data_socketcall *axs = (void *)aux;
 882                         audit_log_format(ab, "nargs=%d", axs->nargs);
 883                         for (i=0; i<axs->nargs; i++)
 884                                 audit_log_format(ab, " a%d=%lx", i, axs->args[i]);
 885                         break; }
 886
 887                 case AUDIT_SOCKADDR: {
 888                         struct audit_aux_data_sockaddr *axs = (void *)aux;
 889
 890                         audit_log_format(ab, "saddr=");
 891                         audit_log_hex(ab, axs->a, axs->len);
 892                         break; }
 893
 894                 case AUDIT_AVC_PATH: {
 895                         struct audit_aux_data_path *axi = (void *)aux;
 896                         audit_log_d_path(ab, "path=", axi->dentry, axi->mnt);
 897                         break; }
 898
 899                 }
 900                 audit_log_end(ab);
 901         }
 902
 903         if (context->pwd && context->pwdmnt) {
 904                 ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
 905                 if (ab) {
 906                         audit_log_d_path(ab, "cwd=", context->pwd, context->pwdmnt);
 907                         audit_log_end(ab);
 908                 }
 909         }
 910         for (i = 0; i < context->name_count; i++) {
 911                 struct audit_names *n = &context->names[i];
 912
 913                 ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
 914                 if (!ab)
 915                         continue; /* audit_panic has been called */
 916
 917                 audit_log_format(ab, "item=%d", i);
 918
 919                 if (n->name) {
 920                         switch(n->name_len) {
 921                         case AUDIT_NAME_FULL:
 922                                 /* log the full path */
 923                                 audit_log_format(ab, " name=");
 924                                 audit_log_untrustedstring(ab, n->name);
 925                                 break;
 926                         case 0:
 927                                 /* name was specified as a relative path and the
 928                                  * directory component is the cwd */
 929                                 audit_log_d_path(ab, " name=", context->pwd,
 930                                                  context->pwdmnt);
 931                                 break;
 932                         default:
 933                                 /* log the name's directory component */
 934                                 audit_log_format(ab, " name=");
 935                                 audit_log_n_untrustedstring(ab, n->name_len,
 936                                                             n->name);
 937                         }
 938                 } else
 939                         audit_log_format(ab, " name=(null)");
 940
 941                 if (n->ino != (unsigned long)-1) {
 942                         audit_log_format(ab, " inode=%lu"
 943                                          " dev=%02x:%02x mode=%#o"
 944                                          " ouid=%u ogid=%u rdev=%02x:%02x",
 945                                          n->ino,
 946                                          MAJOR(n->dev),
 947                                          MINOR(n->dev),
 948                                          n->mode,
 949                                          n->uid,
 950                                          n->gid,
 951                                          MAJOR(n->rdev),
 952                                          MINOR(n->rdev));
 953                 }
 954                 if (n->osid != 0) {
 955                         char *ctx = NULL;
 956                         u32 len;
 957                         if (selinux_ctxid_to_string(
 958                                 n->osid, &ctx, &len)) {
 959                                 audit_log_format(ab, " osid=%u", n->osid);
 960                                 call_panic = 2;
 961                         } else
 962                                 audit_log_format(ab, " obj=%s", ctx);
 963                         kfree(ctx);
 964                 }
 965
 966                 audit_log_end(ab);
 967         }
 968         if (call_panic)
 969                 audit_panic("error converting sid to string");
 970 }
 971
 972 /**
 973  * audit_free - free a per-task audit context
 974  * @tsk: task whose audit context block to free
 975  *
 976  * Called from copy_process and do_exit
 977  */
 978 void audit_free(struct task_struct *tsk)
 979 {
 980         struct audit_context *context;
 981
 982         context = audit_get_context(tsk, 0, 0);
 983         if (likely(!context))
 984                 return;
 985
 986         /* Check for system calls that do not go through the exit
 987          * function (e.g., exit_group), then free context block.
 988          * We use GFP_ATOMIC here because we might be doing this
 989          * in the context of the idle thread */
 990         /* that can happen only if we are called from do_exit() */
 991         if (context->in_syscall && context->auditable)
 992                 audit_log_exit(context, tsk);
 993
 994         audit_free_context(context);
 995 }
 996
 997 /**
 998  * audit_syscall_entry - fill in an audit record at syscall entry
 999  * @tsk: task being audited
1000  * @arch: architecture type
1001  * @major: major syscall type (function)
1002  * @a1: additional syscall register 1
1003  * @a2: additional syscall register 2
1004  * @a3: additional syscall register 3
1005  * @a4: additional syscall register 4
1006  *
1007  * Fill in audit context at syscall entry.  This only happens if the
1008  * audit context was created when the task was created and the state or
1009  * filters demand the audit context be built.  If the state from the
1010  * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
1011  * then the record will be written at syscall exit time (otherwise, it
1012  * will only be written if another part of the kernel requests that it
1013  * be written).
1014  */
1015 void audit_syscall_entry(int arch, int major,
1016                          unsigned long a1, unsigned long a2,
1017                          unsigned long a3, unsigned long a4)
1018 {
1019         struct task_struct *tsk = current;
1020         struct audit_context *context = tsk->audit_context;
1021         enum audit_state     state;
1022
1023         BUG_ON(!context);
1024
1025         /*
1026          * This happens only on certain architectures that make system
1027          * calls in kernel_thread via the entry.S interface, instead of
1028          * with direct calls.  (If you are porting to a new
1029          * architecture, hitting this condition can indicate that you
1030          * got the _exit/_leave calls backward in entry.S.)
1031          *
1032          * i386     no
1033          * x86_64   no
1034          * ppc64    yes (see arch/powerpc/platforms/iseries/misc.S)
1035          *
1036          * This also happens with vm86 emulation in a non-nested manner
1037          * (entries without exits), so this case must be caught.
1038          */
1039         if (context->in_syscall) {
1040                 struct audit_context *newctx;
1041
1042 #if AUDIT_DEBUG
1043                 printk(KERN_ERR
1044                        "audit(:%d) pid=%d in syscall=%d;"
1045                        " entering syscall=%d\n",
1046                        context->serial, tsk->pid, context->major, major);
1047 #endif
1048                 newctx = audit_alloc_context(context->state);
1049                 if (newctx) {
1050                         newctx->previous   = context;
1051                         context            = newctx;
1052                         tsk->audit_context = newctx;
1053                 } else  {
1054                         /* If we can't alloc a new context, the best we
1055                          * can do is to leak memory (any pending putname
1056                          * will be lost).  The only other alternative is
1057                          * to abandon auditing. */
1058                         audit_zero_context(context, context->state);
1059                 }
1060         }
1061         BUG_ON(context->in_syscall || context->name_count);
1062
1063         if (!audit_enabled)
1064                 return;
1065
1066         context->arch       = arch;
1067         context->major      = major;
1068         context->argv[0]    = a1;
1069         context->argv[1]    = a2;
1070         context->argv[2]    = a3;
1071         context->argv[3]    = a4;
1072
1073         state = context->state;
1074         context->dummy = !audit_n_rules;
1075         if (!context->dummy && (state == AUDIT_SETUP_CONTEXT || state == AUDIT_BUILD_CONTEXT))
1076                 state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
1077         if (likely(state == AUDIT_DISABLED))
1078                 return;
1079
1080         context->serial     = 0;
1081         context->ctime      = CURRENT_TIME;
1082         context->in_syscall = 1;
1083         context->auditable  = !!(state == AUDIT_RECORD_CONTEXT);
1084 }
1085
1086 /**
1087  * audit_syscall_exit - deallocate audit context after a system call
1088  * @tsk: task being audited
1089  * @valid: success/failure flag
1090  * @return_code: syscall return value
1091  *
1092  * Tear down after system call.  If the audit context has been marked as
1093  * auditable (either because of the AUDIT_RECORD_CONTEXT state from
1094  * filtering, or because some other part of the kernel write an audit
1095  * message), then write out the syscall information.  In call cases,
1096  * free the names stored from getname().
1097  */
1098 void audit_syscall_exit(int valid, long return_code)
1099 {
1100         struct task_struct *tsk = current;
1101         struct audit_context *context;
1102
1103         context = audit_get_context(tsk, valid, return_code);
1104
1105         if (likely(!context))
1106                 return;
1107
1108         if (context->in_syscall && context->auditable)
1109                 audit_log_exit(context, tsk);
1110
1111         context->in_syscall = 0;
1112         context->auditable  = 0;
1113
1114         if (context->previous) {
1115                 struct audit_context *new_context = context->previous;
1116                 context->previous  = NULL;
1117                 audit_free_context(context);
1118                 tsk->audit_context = new_context;
1119         } else {
1120                 audit_free_names(context);
1121                 audit_free_aux(context);
1122                 kfree(context->filterkey);
1123                 context->filterkey = NULL;
1124                 tsk->audit_context = context;
1125         }
1126 }
1127
1128 /**
1129  * audit_getname - add a name to the list
1130  * @name: name to add
1131  *
1132  * Add a name to the list of audit names for this context.
1133  * Called from fs/namei.c:getname().
1134  */
1135 void __audit_getname(const char *name)
1136 {
1137         struct audit_context *context = current->audit_context;
1138
1139         if (IS_ERR(name) || !name)
1140                 return;
1141
1142         if (!context->in_syscall) {
1143 #if AUDIT_DEBUG == 2
1144                 printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n",
1145                        __FILE__, __LINE__, context->serial, name);
1146                 dump_stack();
1147 #endif
1148                 return;
1149         }
1150         BUG_ON(context->name_count >= AUDIT_NAMES);
1151         context->names[context->name_count].name = name;
1152         context->names[context->name_count].name_len = AUDIT_NAME_FULL;
1153         context->names[context->name_count].name_put = 1;
1154         context->names[context->name_count].ino  = (unsigned long)-1;
1155         ++context->name_count;
1156         if (!context->pwd) {
1157                 read_lock(&current->fs->lock);
1158                 context->pwd = dget(current->fs->pwd);
1159                 context->pwdmnt = mntget(current->fs->pwdmnt);
1160                 read_unlock(&current->fs->lock);
1161         }
1162
1163 }
1164
1165 /* audit_putname - intercept a putname request
1166  * @name: name to intercept and delay for putname
1167  *
1168  * If we have stored the name from getname in the audit context,
1169  * then we delay the putname until syscall exit.
1170  * Called from include/linux/fs.h:putname().
1171  */
1172 void audit_putname(const char *name)
1173 {
1174         struct audit_context *context = current->audit_context;
1175
1176         BUG_ON(!context);
1177         if (!context->in_syscall) {
1178 #if AUDIT_DEBUG == 2
1179                 printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n",
1180                        __FILE__, __LINE__, context->serial, name);
1181                 if (context->name_count) {
1182                         int i;
1183                         for (i = 0; i < context->name_count; i++)
1184                                 printk(KERN_ERR "name[%d] = %p = %s\n", i,
1185                                        context->names[i].name,
1186                                        context->names[i].name ?: "(null)");
1187                 }
1188 #endif
1189                 __putname(name);
1190         }
1191 #if AUDIT_DEBUG
1192         else {
1193                 ++context->put_count;
1194                 if (context->put_count > context->name_count) {
1195                         printk(KERN_ERR "%s:%d(:%d): major=%d"
1196                                " in_syscall=%d putname(%p) name_count=%d"
1197                                " put_count=%d\n",
1198                                __FILE__, __LINE__,
1199                                context->serial, context->major,
1200                                context->in_syscall, name, context->name_count,
1201                                context->put_count);
1202                         dump_stack();
1203                 }
1204         }
1205 #endif
1206 }
1207
1208 /* Copy inode data into an audit_names. */
1209 static void audit_copy_inode(struct audit_names *name, const struct inode *inode)
1210 {
1211         name->ino   = inode->i_ino;
1212         name->dev   = inode->i_sb->s_dev;
1213         name->mode  = inode->i_mode;
1214         name->uid   = inode->i_uid;
1215         name->gid   = inode->i_gid;
1216         name->rdev  = inode->i_rdev;
1217         selinux_get_inode_sid(inode, &name->osid);
1218 }
1219
1220 /**
1221  * audit_inode - store the inode and device from a lookup
1222  * @name: name being audited
1223  * @inode: inode being audited
1224  *
1225  * Called from fs/namei.c:path_lookup().
1226  */
1227 void __audit_inode(const char *name, const struct inode *inode)
1228 {
1229         int idx;
1230         struct audit_context *context = current->audit_context;
1231
1232         if (!context->in_syscall)
1233                 return;
1234         if (context->name_count
1235             && context->names[context->name_count-1].name
1236             && context->names[context->name_count-1].name == name)
1237                 idx = context->name_count - 1;
1238         else if (context->name_count > 1
1239                  && context->names[context->name_count-2].name
1240                  && context->names[context->name_count-2].name == name)
1241                 idx = context->name_count - 2;
1242         else {
1243                 /* FIXME: how much do we care about inodes that have no
1244                  * associated name? */
1245                 if (context->name_count >= AUDIT_NAMES - AUDIT_NAMES_RESERVED)
1246                         return;
1247                 idx = context->name_count++;
1248                 context->names[idx].name = NULL;
1249 #if AUDIT_DEBUG
1250                 ++context->ino_count;
1251 #endif
1252         }
1253         audit_copy_inode(&context->names[idx], inode);
1254 }
1255
1256 /**
1257  * audit_inode_child - collect inode info for created/removed objects
1258  * @dname: inode's dentry name
1259  * @inode: inode being audited
1260  * @parent: inode of dentry parent
1261  *
1262  * For syscalls that create or remove filesystem objects, audit_inode
1263  * can only collect information for the filesystem object's parent.
1264  * This call updates the audit context with the child's information.
1265  * Syscalls that create a new filesystem object must be hooked after
1266  * the object is created.  Syscalls that remove a filesystem object
1267  * must be hooked prior, in order to capture the target inode during
1268  * unsuccessful attempts.
1269  */
1270 void __audit_inode_child(const char *dname, const struct inode *inode,
1271                          const struct inode *parent)
1272 {
1273         int idx;
1274         struct audit_context *context = current->audit_context;
1275         const char *found_name = NULL;
1276         int dirlen = 0;
1277
1278         if (!context->in_syscall)
1279                 return;
1280
1281         /* determine matching parent */
1282         if (!dname)
1283                 goto update_context;
1284         for (idx = 0; idx < context->name_count; idx++)
1285                 if (context->names[idx].ino == parent->i_ino) {
1286                         const char *name = context->names[idx].name;
1287
1288                         if (!name)
1289                                 continue;
1290
1291                         if (audit_compare_dname_path(dname, name, &dirlen) == 0) {
1292                                 context->names[idx].name_len = dirlen;
1293                                 found_name = name;
1294                                 break;
1295                         }
1296                 }
1297
1298 update_context:
1299         idx = context->name_count++;
1300 #if AUDIT_DEBUG
1301         context->ino_count++;
1302 #endif
1303         /* Re-use the name belonging to the slot for a matching parent directory.
1304          * All names for this context are relinquished in audit_free_names() */
1305         context->names[idx].name = found_name;
1306         context->names[idx].name_len = AUDIT_NAME_FULL;
1307         context->names[idx].name_put = 0;       /* don't call __putname() */
1308
1309         if (!inode)
1310                 context->names[idx].ino = (unsigned long)-1;
1311         else
1312                 audit_copy_inode(&context->names[idx], inode);
1313
1314         /* A parent was not found in audit_names, so copy the inode data for the
1315          * provided parent. */
1316         if (!found_name) {
1317                 idx = context->name_count++;
1318 #if AUDIT_DEBUG
1319                 context->ino_count++;
1320 #endif
1321                 audit_copy_inode(&context->names[idx], parent);
1322         }
1323 }
1324
1325 /**
1326  * audit_inode_update - update inode info for last collected name
1327  * @inode: inode being audited
1328  *
1329  * When open() is called on an existing object with the O_CREAT flag, the inode
1330  * data audit initially collects is incorrect.  This additional hook ensures
1331  * audit has the inode data for the actual object to be opened.
1332  */
1333 void __audit_inode_update(const struct inode *inode)
1334 {
1335         struct audit_context *context = current->audit_context;
1336         int idx;
1337
1338         if (!context->in_syscall || !inode)
1339                 return;
1340
1341         if (context->name_count == 0) {
1342                 context->name_count++;
1343 #if AUDIT_DEBUG
1344                 context->ino_count++;
1345 #endif
1346         }
1347         idx = context->name_count - 1;
1348
1349         audit_copy_inode(&context->names[idx], inode);
1350 }
1351
1352 /**
1353  * auditsc_get_stamp - get local copies of audit_context values
1354  * @ctx: audit_context for the task
1355  * @t: timespec to store time recorded in the audit_context
1356  * @serial: serial value that is recorded in the audit_context
1357  *
1358  * Also sets the context as auditable.
1359  */
1360 void auditsc_get_stamp(struct audit_context *ctx,
1361                        struct timespec *t, unsigned int *serial)
1362 {
1363         if (!ctx->serial)
1364                 ctx->serial = audit_serial();
1365         t->tv_sec  = ctx->ctime.tv_sec;
1366         t->tv_nsec = ctx->ctime.tv_nsec;
1367         *serial    = ctx->serial;
1368         ctx->auditable = 1;
1369 }
1370
1371 /**
1372  * audit_set_loginuid - set a task's audit_context loginuid
1373  * @task: task whose audit context is being modified
1374  * @loginuid: loginuid value
1375  *
1376  * Returns 0.
1377  *
1378  * Called (set) from fs/proc/base.c::proc_loginuid_write().
1379  */
1380 int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
1381 {
1382         struct audit_context *context = task->audit_context;
1383
1384         if (context) {
1385                 /* Only log if audit is enabled */
1386                 if (context->in_syscall) {
1387                         struct audit_buffer *ab;
1388
1389                         ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
1390                         if (ab) {
1391                                 audit_log_format(ab, "login pid=%d uid=%u "
1392                                         "old auid=%u new auid=%u",
1393                                         task->pid, task->uid,
1394                                         context->loginuid, loginuid);
1395                                 audit_log_end(ab);
1396                         }
1397                 }
1398                 context->loginuid = loginuid;
1399         }
1400         return 0;
1401 }
1402
1403 /**
1404  * audit_get_loginuid - get the loginuid for an audit_context
1405  * @ctx: the audit_context
1406  *
1407  * Returns the context's loginuid or -1 if @ctx is NULL.
1408  */
1409 uid_t audit_get_loginuid(struct audit_context *ctx)
1410 {
1411         return ctx ? ctx->loginuid : -1;
1412 }
1413
1414 /**
1415  * __audit_mq_open - record audit data for a POSIX MQ open
1416  * @oflag: open flag
1417  * @mode: mode bits
1418  * @u_attr: queue attributes
1419  *
1420  * Returns 0 for success or NULL context or < 0 on error.
1421  */
1422 int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr)
1423 {
1424         struct audit_aux_data_mq_open *ax;
1425         struct audit_context *context = current->audit_context;
1426
1427         if (!audit_enabled)
1428                 return 0;
1429
1430         if (likely(!context))
1431                 return 0;
1432
1433         ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1434         if (!ax)
1435                 return -ENOMEM;
1436
1437         if (u_attr != NULL) {
1438                 if (copy_from_user(&ax->attr, u_attr, sizeof(ax->attr))) {
1439                         kfree(ax);
1440                         return -EFAULT;
1441                 }
1442         } else
1443                 memset(&ax->attr, 0, sizeof(ax->attr));
1444
1445         ax->oflag = oflag;
1446         ax->mode = mode;
1447
1448         ax->d.type = AUDIT_MQ_OPEN;
1449         ax->d.next = context->aux;
1450         context->aux = (void *)ax;
1451         return 0;
1452 }
1453
1454 /**
1455  * __audit_mq_timedsend - record audit data for a POSIX MQ timed send
1456  * @mqdes: MQ descriptor
1457  * @msg_len: Message length
1458  * @msg_prio: Message priority
1459  * @u_abs_timeout: Message timeout in absolute time
1460  *
1461  * Returns 0 for success or NULL context or < 0 on error.
1462  */
1463 int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
1464                         const struct timespec __user *u_abs_timeout)
1465 {
1466         struct audit_aux_data_mq_sendrecv *ax;
1467         struct audit_context *context = current->audit_context;
1468
1469         if (!audit_enabled)
1470                 return 0;
1471
1472         if (likely(!context))
1473                 return 0;
1474
1475         ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1476         if (!ax)
1477                 return -ENOMEM;
1478
1479         if (u_abs_timeout != NULL) {
1480                 if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) {
1481                         kfree(ax);
1482                         return -EFAULT;
1483                 }
1484         } else
1485                 memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout));
1486
1487         ax->mqdes = mqdes;
1488         ax->msg_len = msg_len;
1489         ax->msg_prio = msg_prio;
1490
1491         ax->d.type = AUDIT_MQ_SENDRECV;
1492         ax->d.next = context->aux;
1493         context->aux = (void *)ax;
1494         return 0;
1495 }
1496
1497 /**
1498  * __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive
1499  * @mqdes: MQ descriptor
1500  * @msg_len: Message length
1501  * @u_msg_prio: Message priority
1502  * @u_abs_timeout: Message timeout in absolute time
1503  *
1504  * Returns 0 for success or NULL context or < 0 on error.
1505  */
1506 int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len,
1507                                 unsigned int __user *u_msg_prio,
1508                                 const struct timespec __user *u_abs_timeout)
1509 {
1510         struct audit_aux_data_mq_sendrecv *ax;
1511         struct audit_context *context = current->audit_context;
1512
1513         if (!audit_enabled)
1514                 return 0;
1515
1516         if (likely(!context))
1517                 return 0;
1518
1519         ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1520         if (!ax)
1521                 return -ENOMEM;
1522
1523         if (u_msg_prio != NULL) {
1524                 if (get_user(ax->msg_prio, u_msg_prio)) {
1525                         kfree(ax);
1526                         return -EFAULT;
1527                 }
1528         } else
1529                 ax->msg_prio = 0;
1530
1531         if (u_abs_timeout != NULL) {
1532                 if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) {
1533                         kfree(ax);
1534                         return -EFAULT;
1535                 }
1536         } else
1537                 memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout));
1538
1539         ax->mqdes = mqdes;
1540         ax->msg_len = msg_len;
1541
1542         ax->d.type = AUDIT_MQ_SENDRECV;
1543         ax->d.next = context->aux;
1544         context->aux = (void *)ax;
1545         return 0;
1546 }
1547
1548 /**
1549  * __audit_mq_notify - record audit data for a POSIX MQ notify
1550  * @mqdes: MQ descriptor
1551  * @u_notification: Notification event
1552  *
1553  * Returns 0 for success or NULL context or < 0 on error.
1554  */
1555
1556 int __audit_mq_notify(mqd_t mqdes, const struct sigevent __user *u_notification)
1557 {
1558         struct audit_aux_data_mq_notify *ax;
1559         struct audit_context *context = current->audit_context;
1560
1561         if (!audit_enabled)
1562                 return 0;
1563
1564         if (likely(!context))
1565                 return 0;
1566
1567         ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1568         if (!ax)
1569                 return -ENOMEM;
1570
1571         if (u_notification != NULL) {
1572                 if (copy_from_user(&ax->notification, u_notification, sizeof(ax->notification))) {
1573                         kfree(ax);
1574                         return -EFAULT;
1575                 }
1576         } else
1577                 memset(&ax->notification, 0, sizeof(ax->notification));
1578
1579         ax->mqdes = mqdes;
1580
1581         ax->d.type = AUDIT_MQ_NOTIFY;
1582         ax->d.next = context->aux;
1583         context->aux = (void *)ax;
1584         return 0;
1585 }
1586
1587 /**
1588  * __audit_mq_getsetattr - record audit data for a POSIX MQ get/set attribute
1589  * @mqdes: MQ descriptor
1590  * @mqstat: MQ flags
1591  *
1592  * Returns 0 for success or NULL context or < 0 on error.
1593  */
1594 int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
1595 {
1596         struct audit_aux_data_mq_getsetattr *ax;
1597         struct audit_context *context = current->audit_context;
1598
1599         if (!audit_enabled)
1600                 return 0;
1601
1602         if (likely(!context))
1603                 return 0;
1604
1605         ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1606         if (!ax)
1607                 return -ENOMEM;
1608
1609         ax->mqdes = mqdes;
1610         ax->mqstat = *mqstat;
1611
1612         ax->d.type = AUDIT_MQ_GETSETATTR;
1613         ax->d.next = context->aux;
1614         context->aux = (void *)ax;
1615         return 0;
1616 }
1617
1618 /**
1619  * audit_ipc_obj - record audit data for ipc object
1620  * @ipcp: ipc permissions
1621  *
1622  * Returns 0 for success or NULL context or < 0 on error.
1623  */
1624 int __audit_ipc_obj(struct kern_ipc_perm *ipcp)
1625 {
1626         struct audit_aux_data_ipcctl *ax;
1627         struct audit_context *context = current->audit_context;
1628
1629         ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1630         if (!ax)
1631                 return -ENOMEM;
1632
1633         ax->uid = ipcp->uid;
1634         ax->gid = ipcp->gid;
1635         ax->mode = ipcp->mode;
1636         selinux_get_ipc_sid(ipcp, &ax->osid);
1637
1638         ax->d.type = AUDIT_IPC;
1639         ax->d.next = context->aux;
1640         context->aux = (void *)ax;
1641         return 0;
1642 }
1643
1644 /**
1645  * audit_ipc_set_perm - record audit data for new ipc permissions
1646  * @qbytes: msgq bytes
1647  * @uid: msgq user id
1648  * @gid: msgq group id
1649  * @mode: msgq mode (permissions)
1650  *
1651  * Returns 0 for success or NULL context or < 0 on error.
1652  */
1653 int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)
1654 {
1655         struct audit_aux_data_ipcctl *ax;
1656         struct audit_context *context = current->audit_context;
1657
1658         ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1659         if (!ax)
1660                 return -ENOMEM;
1661
1662         ax->qbytes = qbytes;
1663         ax->uid = uid;
1664         ax->gid = gid;
1665         ax->mode = mode;
1666
1667         ax->d.type = AUDIT_IPC_SET_PERM;
1668         ax->d.next = context->aux;
1669         context->aux = (void *)ax;
1670         return 0;
1671 }
1672
1673 int audit_bprm(struct linux_binprm *bprm)
1674 {
1675         struct audit_aux_data_execve *ax;
1676         struct audit_context *context = current->audit_context;
1677         unsigned long p, next;
1678         void *to;
1679
1680         if (likely(!audit_enabled || !context || context->dummy))
1681                 return 0;
1682
1683         ax = kmalloc(sizeof(*ax) + PAGE_SIZE * MAX_ARG_PAGES - bprm->p,
1684                                 GFP_KERNEL);
1685         if (!ax)
1686                 return -ENOMEM;
1687
1688         ax->argc = bprm->argc;
1689         ax->envc = bprm->envc;
1690         for (p = bprm->p, to = ax->mem; p < MAX_ARG_PAGES*PAGE_SIZE; p = next) {
1691                 struct page *page = bprm->page[p / PAGE_SIZE];
1692                 void *kaddr = kmap(page);
1693                 next = (p + PAGE_SIZE) & ~(PAGE_SIZE - 1);
1694                 memcpy(to, kaddr + (p & (PAGE_SIZE - 1)), next - p);
1695                 to += next - p;
1696                 kunmap(page);
1697         }
1698
1699         ax->d.type = AUDIT_EXECVE;
1700         ax->d.next = context->aux;
1701         context->aux = (void *)ax;
1702         return 0;
1703 }
1704
1705
1706 /**
1707  * audit_socketcall - record audit data for sys_socketcall
1708  * @nargs: number of args
1709  * @args: args array
1710  *
1711  * Returns 0 for success or NULL context or < 0 on error.
1712  */
1713 int audit_socketcall(int nargs, unsigned long *args)
1714 {
1715         struct audit_aux_data_socketcall *ax;
1716         struct audit_context *context = current->audit_context;
1717
1718         if (likely(!context || context->dummy))
1719                 return 0;
1720
1721         ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL);
1722         if (!ax)
1723                 return -ENOMEM;
1724
1725         ax->nargs = nargs;
1726         memcpy(ax->args, args, nargs * sizeof(unsigned long));
1727
1728         ax->d.type = AUDIT_SOCKETCALL;
1729         ax->d.next = context->aux;
1730         context->aux = (void *)ax;
1731         return 0;
1732 }
1733
1734 /**
1735  * audit_sockaddr - record audit data for sys_bind, sys_connect, sys_sendto
1736  * @len: data length in user space
1737  * @a: data address in kernel space
1738  *
1739  * Returns 0 for success or NULL context or < 0 on error.
1740  */
1741 int audit_sockaddr(int len, void *a)
1742 {
1743         struct audit_aux_data_sockaddr *ax;
1744         struct audit_context *context = current->audit_context;
1745
1746         if (likely(!context || context->dummy))
1747                 return 0;
1748
1749         ax = kmalloc(sizeof(*ax) + len, GFP_KERNEL);
1750         if (!ax)
1751                 return -ENOMEM;
1752
1753         ax->len = len;
1754         memcpy(ax->a, a, len);
1755
1756         ax->d.type = AUDIT_SOCKADDR;
1757         ax->d.next = context->aux;
1758         context->aux = (void *)ax;
1759         return 0;
1760 }
1761
1762 /**
1763  * audit_avc_path - record the granting or denial of permissions
1764  * @dentry: dentry to record
1765  * @mnt: mnt to record
1766  *
1767  * Returns 0 for success or NULL context or < 0 on error.
1768  *
1769  * Called from security/selinux/avc.c::avc_audit()
1770  */
1771 int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt)
1772 {
1773         struct audit_aux_data_path *ax;
1774         struct audit_context *context = current->audit_context;
1775
1776         if (likely(!context))
1777                 return 0;
1778
1779         ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
1780         if (!ax)
1781                 return -ENOMEM;
1782
1783         ax->dentry = dget(dentry);
1784         ax->mnt = mntget(mnt);
1785
1786         ax->d.type = AUDIT_AVC_PATH;
1787         ax->d.next = context->aux;
1788         context->aux = (void *)ax;
1789         return 0;
1790 }
1791
1792 /**
1793  * audit_signal_info - record signal info for shutting down audit subsystem
1794  * @sig: signal value
1795  * @t: task being signaled
1796  *
1797  * If the audit subsystem is being terminated, record the task (pid)
1798  * and uid that is doing that.
1799  */
1800 void __audit_signal_info(int sig, struct task_struct *t)
1801 {
1802         extern pid_t audit_sig_pid;
1803         extern uid_t audit_sig_uid;
1804         extern u32 audit_sig_sid;
1805
1806         if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1) {
1807                 struct task_struct *tsk = current;
1808                 struct audit_context *ctx = tsk->audit_context;
1809                 audit_sig_pid = tsk->pid;
1810                 if (ctx)
1811                         audit_sig_uid = ctx->loginuid;
1812                 else
1813                         audit_sig_uid = tsk->uid;
1814                 selinux_get_task_sid(tsk, &audit_sig_sid);
1815         }
1816 }