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