1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24  * Copyright (c) 2013 by Delphix. All rights reserved.
  25  */
  26 
  27 #include <sys/types.h>
  28 #include <sys/param.h>
  29 #include <sys/time.h>
  30 #include <sys/systm.h>
  31 #include <sys/sysmacros.h>
  32 #include <sys/resource.h>
  33 #include <sys/vfs.h>
  34 #include <sys/vnode.h>
  35 #include <sys/sid.h>
  36 #include <sys/file.h>
  37 #include <sys/stat.h>
  38 #include <sys/kmem.h>
  39 #include <sys/cmn_err.h>
  40 #include <sys/errno.h>
  41 #include <sys/unistd.h>
  42 #include <sys/sdt.h>
  43 #include <sys/fs/zfs.h>
  44 #include <sys/mode.h>
  45 #include <sys/policy.h>
  46 #include <sys/zfs_znode.h>
  47 #include <sys/zfs_fuid.h>
  48 #include <sys/zfs_acl.h>
  49 #include <sys/zfs_dir.h>
  50 #include <sys/zfs_vfsops.h>
  51 #include <sys/dmu.h>
  52 #include <sys/dnode.h>
  53 #include <sys/zap.h>
  54 #include <sys/sa.h>
  55 #include "fs/fs_subr.h"
  56 #include <acl/acl_common.h>
  57 
  58 #define ALLOW   ACE_ACCESS_ALLOWED_ACE_TYPE
  59 #define DENY    ACE_ACCESS_DENIED_ACE_TYPE
  60 #define MAX_ACE_TYPE    ACE_SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE
  61 #define MIN_ACE_TYPE    ALLOW
  62 
  63 #define OWNING_GROUP            (ACE_GROUP|ACE_IDENTIFIER_GROUP)
  64 #define EVERYONE_ALLOW_MASK (ACE_READ_ACL|ACE_READ_ATTRIBUTES | \
  65     ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE)
  66 #define EVERYONE_DENY_MASK (ACE_WRITE_ACL|ACE_WRITE_OWNER | \
  67     ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS)
  68 #define OWNER_ALLOW_MASK (ACE_WRITE_ACL | ACE_WRITE_OWNER | \
  69     ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS)
  70 
  71 #define ZFS_CHECKED_MASKS (ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_DATA| \
  72     ACE_READ_NAMED_ATTRS|ACE_WRITE_DATA|ACE_WRITE_ATTRIBUTES| \
  73     ACE_WRITE_NAMED_ATTRS|ACE_APPEND_DATA|ACE_EXECUTE|ACE_WRITE_OWNER| \
  74     ACE_WRITE_ACL|ACE_DELETE|ACE_DELETE_CHILD|ACE_SYNCHRONIZE)
  75 
  76 #define WRITE_MASK_DATA (ACE_WRITE_DATA|ACE_APPEND_DATA|ACE_WRITE_NAMED_ATTRS)
  77 #define WRITE_MASK_ATTRS (ACE_WRITE_ACL|ACE_WRITE_OWNER|ACE_WRITE_ATTRIBUTES| \
  78     ACE_DELETE|ACE_DELETE_CHILD)
  79 #define WRITE_MASK (WRITE_MASK_DATA|WRITE_MASK_ATTRS)
  80 
  81 #define OGE_CLEAR       (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \
  82     ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE)
  83 
  84 #define OKAY_MASK_BITS (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \
  85     ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE)
  86 
  87 #define ALL_INHERIT     (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE | \
  88     ACE_NO_PROPAGATE_INHERIT_ACE|ACE_INHERIT_ONLY_ACE|ACE_INHERITED_ACE)
  89 
  90 #define RESTRICTED_CLEAR        (ACE_WRITE_ACL|ACE_WRITE_OWNER)
  91 
  92 #define V4_ACL_WIDE_FLAGS (ZFS_ACL_AUTO_INHERIT|ZFS_ACL_DEFAULTED|\
  93     ZFS_ACL_PROTECTED)
  94 
  95 #define ZFS_ACL_WIDE_FLAGS (V4_ACL_WIDE_FLAGS|ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|\
  96     ZFS_ACL_OBJ_ACE)
  97 
  98 #define ALL_MODE_EXECS (S_IXUSR | S_IXGRP | S_IXOTH)
  99 
 100 static uint16_t
 101 zfs_ace_v0_get_type(void *acep)
 102 {
 103         return (((zfs_oldace_t *)acep)->z_type);
 104 }
 105 
 106 static uint16_t
 107 zfs_ace_v0_get_flags(void *acep)
 108 {
 109         return (((zfs_oldace_t *)acep)->z_flags);
 110 }
 111 
 112 static uint32_t
 113 zfs_ace_v0_get_mask(void *acep)
 114 {
 115         return (((zfs_oldace_t *)acep)->z_access_mask);
 116 }
 117 
 118 static uint64_t
 119 zfs_ace_v0_get_who(void *acep)
 120 {
 121         return (((zfs_oldace_t *)acep)->z_fuid);
 122 }
 123 
 124 static void
 125 zfs_ace_v0_set_type(void *acep, uint16_t type)
 126 {
 127         ((zfs_oldace_t *)acep)->z_type = type;
 128 }
 129 
 130 static void
 131 zfs_ace_v0_set_flags(void *acep, uint16_t flags)
 132 {
 133         ((zfs_oldace_t *)acep)->z_flags = flags;
 134 }
 135 
 136 static void
 137 zfs_ace_v0_set_mask(void *acep, uint32_t mask)
 138 {
 139         ((zfs_oldace_t *)acep)->z_access_mask = mask;
 140 }
 141 
 142 static void
 143 zfs_ace_v0_set_who(void *acep, uint64_t who)
 144 {
 145         ((zfs_oldace_t *)acep)->z_fuid = who;
 146 }
 147 
 148 /*ARGSUSED*/
 149 static size_t
 150 zfs_ace_v0_size(void *acep)
 151 {
 152         return (sizeof (zfs_oldace_t));
 153 }
 154 
 155 static size_t
 156 zfs_ace_v0_abstract_size(void)
 157 {
 158         return (sizeof (zfs_oldace_t));
 159 }
 160 
 161 static int
 162 zfs_ace_v0_mask_off(void)
 163 {
 164         return (offsetof(zfs_oldace_t, z_access_mask));
 165 }
 166 
 167 /*ARGSUSED*/
 168 static int
 169 zfs_ace_v0_data(void *acep, void **datap)
 170 {
 171         *datap = NULL;
 172         return (0);
 173 }
 174 
 175 static acl_ops_t zfs_acl_v0_ops = {
 176         zfs_ace_v0_get_mask,
 177         zfs_ace_v0_set_mask,
 178         zfs_ace_v0_get_flags,
 179         zfs_ace_v0_set_flags,
 180         zfs_ace_v0_get_type,
 181         zfs_ace_v0_set_type,
 182         zfs_ace_v0_get_who,
 183         zfs_ace_v0_set_who,
 184         zfs_ace_v0_size,
 185         zfs_ace_v0_abstract_size,
 186         zfs_ace_v0_mask_off,
 187         zfs_ace_v0_data
 188 };
 189 
 190 static uint16_t
 191 zfs_ace_fuid_get_type(void *acep)
 192 {
 193         return (((zfs_ace_hdr_t *)acep)->z_type);
 194 }
 195 
 196 static uint16_t
 197 zfs_ace_fuid_get_flags(void *acep)
 198 {
 199         return (((zfs_ace_hdr_t *)acep)->z_flags);
 200 }
 201 
 202 static uint32_t
 203 zfs_ace_fuid_get_mask(void *acep)
 204 {
 205         return (((zfs_ace_hdr_t *)acep)->z_access_mask);
 206 }
 207 
 208 static uint64_t
 209 zfs_ace_fuid_get_who(void *args)
 210 {
 211         uint16_t entry_type;
 212         zfs_ace_t *acep = args;
 213 
 214         entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS;
 215 
 216         if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP ||
 217             entry_type == ACE_EVERYONE)
 218                 return (-1);
 219         return (((zfs_ace_t *)acep)->z_fuid);
 220 }
 221 
 222 static void
 223 zfs_ace_fuid_set_type(void *acep, uint16_t type)
 224 {
 225         ((zfs_ace_hdr_t *)acep)->z_type = type;
 226 }
 227 
 228 static void
 229 zfs_ace_fuid_set_flags(void *acep, uint16_t flags)
 230 {
 231         ((zfs_ace_hdr_t *)acep)->z_flags = flags;
 232 }
 233 
 234 static void
 235 zfs_ace_fuid_set_mask(void *acep, uint32_t mask)
 236 {
 237         ((zfs_ace_hdr_t *)acep)->z_access_mask = mask;
 238 }
 239 
 240 static void
 241 zfs_ace_fuid_set_who(void *arg, uint64_t who)
 242 {
 243         zfs_ace_t *acep = arg;
 244 
 245         uint16_t entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS;
 246 
 247         if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP ||
 248             entry_type == ACE_EVERYONE)
 249                 return;
 250         acep->z_fuid = who;
 251 }
 252 
 253 static size_t
 254 zfs_ace_fuid_size(void *acep)
 255 {
 256         zfs_ace_hdr_t *zacep = acep;
 257         uint16_t entry_type;
 258 
 259         switch (zacep->z_type) {
 260         case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
 261         case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
 262         case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
 263         case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
 264                 return (sizeof (zfs_object_ace_t));
 265         case ALLOW:
 266         case DENY:
 267                 entry_type =
 268                     (((zfs_ace_hdr_t *)acep)->z_flags & ACE_TYPE_FLAGS);
 269                 if (entry_type == ACE_OWNER ||
 270                     entry_type == OWNING_GROUP ||
 271                     entry_type == ACE_EVERYONE)
 272                         return (sizeof (zfs_ace_hdr_t));
 273                 /*FALLTHROUGH*/
 274         default:
 275                 return (sizeof (zfs_ace_t));
 276         }
 277 }
 278 
 279 static size_t
 280 zfs_ace_fuid_abstract_size(void)
 281 {
 282         return (sizeof (zfs_ace_hdr_t));
 283 }
 284 
 285 static int
 286 zfs_ace_fuid_mask_off(void)
 287 {
 288         return (offsetof(zfs_ace_hdr_t, z_access_mask));
 289 }
 290 
 291 static int
 292 zfs_ace_fuid_data(void *acep, void **datap)
 293 {
 294         zfs_ace_t *zacep = acep;
 295         zfs_object_ace_t *zobjp;
 296 
 297         switch (zacep->z_hdr.z_type) {
 298         case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
 299         case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
 300         case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
 301         case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
 302                 zobjp = acep;
 303                 *datap = (caddr_t)zobjp + sizeof (zfs_ace_t);
 304                 return (sizeof (zfs_object_ace_t) - sizeof (zfs_ace_t));
 305         default:
 306                 *datap = NULL;
 307                 return (0);
 308         }
 309 }
 310 
 311 static acl_ops_t zfs_acl_fuid_ops = {
 312         zfs_ace_fuid_get_mask,
 313         zfs_ace_fuid_set_mask,
 314         zfs_ace_fuid_get_flags,
 315         zfs_ace_fuid_set_flags,
 316         zfs_ace_fuid_get_type,
 317         zfs_ace_fuid_set_type,
 318         zfs_ace_fuid_get_who,
 319         zfs_ace_fuid_set_who,
 320         zfs_ace_fuid_size,
 321         zfs_ace_fuid_abstract_size,
 322         zfs_ace_fuid_mask_off,
 323         zfs_ace_fuid_data
 324 };
 325 
 326 /*
 327  * The following three functions are provided for compatibility with
 328  * older ZPL version in order to determine if the file use to have
 329  * an external ACL and what version of ACL previously existed on the
 330  * file.  Would really be nice to not need this, sigh.
 331  */
 332 uint64_t
 333 zfs_external_acl(znode_t *zp)
 334 {
 335         zfs_acl_phys_t acl_phys;
 336         int error;
 337 
 338         if (zp->z_is_sa)
 339                 return (0);
 340 
 341         /*
 342          * Need to deal with a potential
 343          * race where zfs_sa_upgrade could cause
 344          * z_isa_sa to change.
 345          *
 346          * If the lookup fails then the state of z_is_sa should have
 347          * changed.
 348          */
 349 
 350         if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zp->z_zfsvfs),
 351             &acl_phys, sizeof (acl_phys))) == 0)
 352                 return (acl_phys.z_acl_extern_obj);
 353         else {
 354                 /*
 355                  * after upgrade the SA_ZPL_ZNODE_ACL should have been
 356                  * removed
 357                  */
 358                 VERIFY(zp->z_is_sa && error == ENOENT);
 359                 return (0);
 360         }
 361 }
 362 
 363 /*
 364  * Determine size of ACL in bytes
 365  *
 366  * This is more complicated than it should be since we have to deal
 367  * with old external ACLs.
 368  */
 369 static int
 370 zfs_acl_znode_info(znode_t *zp, int *aclsize, int *aclcount,
 371     zfs_acl_phys_t *aclphys)
 372 {
 373         zfsvfs_t *zfsvfs = zp->z_zfsvfs;
 374         uint64_t acl_count;
 375         int size;
 376         int error;
 377 
 378         ASSERT(MUTEX_HELD(&zp->z_acl_lock));
 379         if (zp->z_is_sa) {
 380                 if ((error = sa_size(zp->z_sa_hdl, SA_ZPL_DACL_ACES(zfsvfs),
 381                     &size)) != 0)
 382                         return (error);
 383                 *aclsize = size;
 384                 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_COUNT(zfsvfs),
 385                     &acl_count, sizeof (acl_count))) != 0)
 386                         return (error);
 387                 *aclcount = acl_count;
 388         } else {
 389                 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zfsvfs),
 390                     aclphys, sizeof (*aclphys))) != 0)
 391                         return (error);
 392 
 393                 if (aclphys->z_acl_version == ZFS_ACL_VERSION_INITIAL) {
 394                         *aclsize = ZFS_ACL_SIZE(aclphys->z_acl_size);
 395                         *aclcount = aclphys->z_acl_size;
 396                 } else {
 397                         *aclsize = aclphys->z_acl_size;
 398                         *aclcount = aclphys->z_acl_count;
 399                 }
 400         }
 401         return (0);
 402 }
 403 
 404 int
 405 zfs_znode_acl_version(znode_t *zp)
 406 {
 407         zfs_acl_phys_t acl_phys;
 408 
 409         if (zp->z_is_sa)
 410                 return (ZFS_ACL_VERSION_FUID);
 411         else {
 412                 int error;
 413 
 414                 /*
 415                  * Need to deal with a potential
 416                  * race where zfs_sa_upgrade could cause
 417                  * z_isa_sa to change.
 418                  *
 419                  * If the lookup fails then the state of z_is_sa should have
 420                  * changed.
 421                  */
 422                 if ((error = sa_lookup(zp->z_sa_hdl,
 423                     SA_ZPL_ZNODE_ACL(zp->z_zfsvfs),
 424                     &acl_phys, sizeof (acl_phys))) == 0)
 425                         return (acl_phys.z_acl_version);
 426                 else {
 427                         /*
 428                          * After upgrade SA_ZPL_ZNODE_ACL should have
 429                          * been removed.
 430                          */
 431                         VERIFY(zp->z_is_sa && error == ENOENT);
 432                         return (ZFS_ACL_VERSION_FUID);
 433                 }
 434         }
 435 }
 436 
 437 static int
 438 zfs_acl_version(int version)
 439 {
 440         if (version < ZPL_VERSION_FUID)
 441                 return (ZFS_ACL_VERSION_INITIAL);
 442         else
 443                 return (ZFS_ACL_VERSION_FUID);
 444 }
 445 
 446 static int
 447 zfs_acl_version_zp(znode_t *zp)
 448 {
 449         return (zfs_acl_version(zp->z_zfsvfs->z_version));
 450 }
 451 
 452 zfs_acl_t *
 453 zfs_acl_alloc(int vers)
 454 {
 455         zfs_acl_t *aclp;
 456 
 457         aclp = kmem_zalloc(sizeof (zfs_acl_t), KM_SLEEP);
 458         list_create(&aclp->z_acl, sizeof (zfs_acl_node_t),
 459             offsetof(zfs_acl_node_t, z_next));
 460         aclp->z_version = vers;
 461         if (vers == ZFS_ACL_VERSION_FUID)
 462                 aclp->z_ops = zfs_acl_fuid_ops;
 463         else
 464                 aclp->z_ops = zfs_acl_v0_ops;
 465         return (aclp);
 466 }
 467 
 468 zfs_acl_node_t *
 469 zfs_acl_node_alloc(size_t bytes)
 470 {
 471         zfs_acl_node_t *aclnode;
 472 
 473         aclnode = kmem_zalloc(sizeof (zfs_acl_node_t), KM_SLEEP);
 474         if (bytes) {
 475                 aclnode->z_acldata = kmem_alloc(bytes, KM_SLEEP);
 476                 aclnode->z_allocdata = aclnode->z_acldata;
 477                 aclnode->z_allocsize = bytes;
 478                 aclnode->z_size = bytes;
 479         }
 480 
 481         return (aclnode);
 482 }
 483 
 484 static void
 485 zfs_acl_node_free(zfs_acl_node_t *aclnode)
 486 {
 487         if (aclnode->z_allocsize)
 488                 kmem_free(aclnode->z_allocdata, aclnode->z_allocsize);
 489         kmem_free(aclnode, sizeof (zfs_acl_node_t));
 490 }
 491 
 492 static void
 493 zfs_acl_release_nodes(zfs_acl_t *aclp)
 494 {
 495         zfs_acl_node_t *aclnode;
 496 
 497         while (aclnode = list_head(&aclp->z_acl)) {
 498                 list_remove(&aclp->z_acl, aclnode);
 499                 zfs_acl_node_free(aclnode);
 500         }
 501         aclp->z_acl_count = 0;
 502         aclp->z_acl_bytes = 0;
 503 }
 504 
 505 void
 506 zfs_acl_free(zfs_acl_t *aclp)
 507 {
 508         zfs_acl_release_nodes(aclp);
 509         list_destroy(&aclp->z_acl);
 510         kmem_free(aclp, sizeof (zfs_acl_t));
 511 }
 512 
 513 static boolean_t
 514 zfs_acl_valid_ace_type(uint_t type, uint_t flags)
 515 {
 516         uint16_t entry_type;
 517 
 518         switch (type) {
 519         case ALLOW:
 520         case DENY:
 521         case ACE_SYSTEM_AUDIT_ACE_TYPE:
 522         case ACE_SYSTEM_ALARM_ACE_TYPE:
 523                 entry_type = flags & ACE_TYPE_FLAGS;
 524                 return (entry_type == ACE_OWNER ||
 525                     entry_type == OWNING_GROUP ||
 526                     entry_type == ACE_EVERYONE || entry_type == 0 ||
 527                     entry_type == ACE_IDENTIFIER_GROUP);
 528         default:
 529                 if (type >= MIN_ACE_TYPE && type <= MAX_ACE_TYPE)
 530                         return (B_TRUE);
 531         }
 532         return (B_FALSE);
 533 }
 534 
 535 static boolean_t
 536 zfs_ace_valid(vtype_t obj_type, zfs_acl_t *aclp, uint16_t type, uint16_t iflags)
 537 {
 538         /*
 539          * first check type of entry
 540          */
 541 
 542         if (!zfs_acl_valid_ace_type(type, iflags))
 543                 return (B_FALSE);
 544 
 545         switch (type) {
 546         case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
 547         case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
 548         case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
 549         case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
 550                 if (aclp->z_version < ZFS_ACL_VERSION_FUID)
 551                         return (B_FALSE);
 552                 aclp->z_hints |= ZFS_ACL_OBJ_ACE;
 553         }
 554 
 555         /*
 556          * next check inheritance level flags
 557          */
 558 
 559         if (obj_type == VDIR &&
 560             (iflags & (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE)))
 561                 aclp->z_hints |= ZFS_INHERIT_ACE;
 562 
 563         if (iflags & (ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE)) {
 564                 if ((iflags & (ACE_FILE_INHERIT_ACE|
 565                     ACE_DIRECTORY_INHERIT_ACE)) == 0) {
 566                         return (B_FALSE);
 567                 }
 568         }
 569 
 570         return (B_TRUE);
 571 }
 572 
 573 static void *
 574 zfs_acl_next_ace(zfs_acl_t *aclp, void *start, uint64_t *who,
 575     uint32_t *access_mask, uint16_t *iflags, uint16_t *type)
 576 {
 577         zfs_acl_node_t *aclnode;
 578 
 579         ASSERT(aclp);
 580 
 581         if (start == NULL) {
 582                 aclnode = list_head(&aclp->z_acl);
 583                 if (aclnode == NULL)
 584                         return (NULL);
 585 
 586                 aclp->z_next_ace = aclnode->z_acldata;
 587                 aclp->z_curr_node = aclnode;
 588                 aclnode->z_ace_idx = 0;
 589         }
 590 
 591         aclnode = aclp->z_curr_node;
 592 
 593         if (aclnode == NULL)
 594                 return (NULL);
 595 
 596         if (aclnode->z_ace_idx >= aclnode->z_ace_count) {
 597                 aclnode = list_next(&aclp->z_acl, aclnode);
 598                 if (aclnode == NULL)
 599                         return (NULL);
 600                 else {
 601                         aclp->z_curr_node = aclnode;
 602                         aclnode->z_ace_idx = 0;
 603                         aclp->z_next_ace = aclnode->z_acldata;
 604                 }
 605         }
 606 
 607         if (aclnode->z_ace_idx < aclnode->z_ace_count) {
 608                 void *acep = aclp->z_next_ace;
 609                 size_t ace_size;
 610 
 611                 /*
 612                  * Make sure we don't overstep our bounds
 613                  */
 614                 ace_size = aclp->z_ops.ace_size(acep);
 615 
 616                 if (((caddr_t)acep + ace_size) >
 617                     ((caddr_t)aclnode->z_acldata + aclnode->z_size)) {
 618                         return (NULL);
 619                 }
 620 
 621                 *iflags = aclp->z_ops.ace_flags_get(acep);
 622                 *type = aclp->z_ops.ace_type_get(acep);
 623                 *access_mask = aclp->z_ops.ace_mask_get(acep);
 624                 *who = aclp->z_ops.ace_who_get(acep);
 625                 aclp->z_next_ace = (caddr_t)aclp->z_next_ace + ace_size;
 626                 aclnode->z_ace_idx++;
 627 
 628                 return ((void *)acep);
 629         }
 630         return (NULL);
 631 }
 632 
 633 /*ARGSUSED*/
 634 static uint64_t
 635 zfs_ace_walk(void *datap, uint64_t cookie, int aclcnt,
 636     uint16_t *flags, uint16_t *type, uint32_t *mask)
 637 {
 638         zfs_acl_t *aclp = datap;
 639         zfs_ace_hdr_t *acep = (zfs_ace_hdr_t *)(uintptr_t)cookie;
 640         uint64_t who;
 641 
 642         acep = zfs_acl_next_ace(aclp, acep, &who, mask,
 643             flags, type);
 644         return ((uint64_t)(uintptr_t)acep);
 645 }
 646 
 647 static zfs_acl_node_t *
 648 zfs_acl_curr_node(zfs_acl_t *aclp)
 649 {
 650         ASSERT(aclp->z_curr_node);
 651         return (aclp->z_curr_node);
 652 }
 653 
 654 /*
 655  * Copy ACE to internal ZFS format.
 656  * While processing the ACL each ACE will be validated for correctness.
 657  * ACE FUIDs will be created later.
 658  */
 659 int
 660 zfs_copy_ace_2_fuid(zfsvfs_t *zfsvfs, vtype_t obj_type, zfs_acl_t *aclp,
 661     void *datap, zfs_ace_t *z_acl, uint64_t aclcnt, size_t *size,
 662     zfs_fuid_info_t **fuidp, cred_t *cr)
 663 {
 664         int i;
 665         uint16_t entry_type;
 666         zfs_ace_t *aceptr = z_acl;
 667         ace_t *acep = datap;
 668         zfs_object_ace_t *zobjacep;
 669         ace_object_t *aceobjp;
 670 
 671         for (i = 0; i != aclcnt; i++) {
 672                 aceptr->z_hdr.z_access_mask = acep->a_access_mask;
 673                 aceptr->z_hdr.z_flags = acep->a_flags;
 674                 aceptr->z_hdr.z_type = acep->a_type;
 675                 entry_type = aceptr->z_hdr.z_flags & ACE_TYPE_FLAGS;
 676                 if (entry_type != ACE_OWNER && entry_type != OWNING_GROUP &&
 677                     entry_type != ACE_EVERYONE) {
 678                         aceptr->z_fuid = zfs_fuid_create(zfsvfs, acep->a_who,
 679                             cr, (entry_type == 0) ?
 680                             ZFS_ACE_USER : ZFS_ACE_GROUP, fuidp);
 681                 }
 682 
 683                 /*
 684                  * Make sure ACE is valid
 685                  */
 686                 if (zfs_ace_valid(obj_type, aclp, aceptr->z_hdr.z_type,
 687                     aceptr->z_hdr.z_flags) != B_TRUE)
 688                         return (SET_ERROR(EINVAL));
 689 
 690                 switch (acep->a_type) {
 691                 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
 692                 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
 693                 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
 694                 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
 695                         zobjacep = (zfs_object_ace_t *)aceptr;
 696                         aceobjp = (ace_object_t *)acep;
 697 
 698                         bcopy(aceobjp->a_obj_type, zobjacep->z_object_type,
 699                             sizeof (aceobjp->a_obj_type));
 700                         bcopy(aceobjp->a_inherit_obj_type,
 701                             zobjacep->z_inherit_type,
 702                             sizeof (aceobjp->a_inherit_obj_type));
 703                         acep = (ace_t *)((caddr_t)acep + sizeof (ace_object_t));
 704                         break;
 705                 default:
 706                         acep = (ace_t *)((caddr_t)acep + sizeof (ace_t));
 707                 }
 708 
 709                 aceptr = (zfs_ace_t *)((caddr_t)aceptr +
 710                     aclp->z_ops.ace_size(aceptr));
 711         }
 712 
 713         *size = (caddr_t)aceptr - (caddr_t)z_acl;
 714 
 715         return (0);
 716 }
 717 
 718 /*
 719  * Copy ZFS ACEs to fixed size ace_t layout
 720  */
 721 static void
 722 zfs_copy_fuid_2_ace(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, cred_t *cr,
 723     void *datap, int filter)
 724 {
 725         uint64_t who;
 726         uint32_t access_mask;
 727         uint16_t iflags, type;
 728         zfs_ace_hdr_t *zacep = NULL;
 729         ace_t *acep = datap;
 730         ace_object_t *objacep;
 731         zfs_object_ace_t *zobjacep;
 732         size_t ace_size;
 733         uint16_t entry_type;
 734 
 735         while (zacep = zfs_acl_next_ace(aclp, zacep,
 736             &who, &access_mask, &iflags, &type)) {
 737 
 738                 switch (type) {
 739                 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
 740                 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
 741                 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
 742                 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
 743                         if (filter) {
 744                                 continue;
 745                         }
 746                         zobjacep = (zfs_object_ace_t *)zacep;
 747                         objacep = (ace_object_t *)acep;
 748                         bcopy(zobjacep->z_object_type,
 749                             objacep->a_obj_type,
 750                             sizeof (zobjacep->z_object_type));
 751                         bcopy(zobjacep->z_inherit_type,
 752                             objacep->a_inherit_obj_type,
 753                             sizeof (zobjacep->z_inherit_type));
 754                         ace_size = sizeof (ace_object_t);
 755                         break;
 756                 default:
 757                         ace_size = sizeof (ace_t);
 758                         break;
 759                 }
 760 
 761                 entry_type = (iflags & ACE_TYPE_FLAGS);
 762                 if ((entry_type != ACE_OWNER &&
 763                     entry_type != OWNING_GROUP &&
 764                     entry_type != ACE_EVERYONE)) {
 765                         acep->a_who = zfs_fuid_map_id(zfsvfs, who,
 766                             cr, (entry_type & ACE_IDENTIFIER_GROUP) ?
 767                             ZFS_ACE_GROUP : ZFS_ACE_USER);
 768                 } else {
 769                         acep->a_who = (uid_t)(int64_t)who;
 770                 }
 771                 acep->a_access_mask = access_mask;
 772                 acep->a_flags = iflags;
 773                 acep->a_type = type;
 774                 acep = (ace_t *)((caddr_t)acep + ace_size);
 775         }
 776 }
 777 
 778 static int
 779 zfs_copy_ace_2_oldace(vtype_t obj_type, zfs_acl_t *aclp, ace_t *acep,
 780     zfs_oldace_t *z_acl, int aclcnt, size_t *size)
 781 {
 782         int i;
 783         zfs_oldace_t *aceptr = z_acl;
 784 
 785         for (i = 0; i != aclcnt; i++, aceptr++) {
 786                 aceptr->z_access_mask = acep[i].a_access_mask;
 787                 aceptr->z_type = acep[i].a_type;
 788                 aceptr->z_flags = acep[i].a_flags;
 789                 aceptr->z_fuid = acep[i].a_who;
 790                 /*
 791                  * Make sure ACE is valid
 792                  */
 793                 if (zfs_ace_valid(obj_type, aclp, aceptr->z_type,
 794                     aceptr->z_flags) != B_TRUE)
 795                         return (SET_ERROR(EINVAL));
 796         }
 797         *size = (caddr_t)aceptr - (caddr_t)z_acl;
 798         return (0);
 799 }
 800 
 801 /*
 802  * convert old ACL format to new
 803  */
 804 void
 805 zfs_acl_xform(znode_t *zp, zfs_acl_t *aclp, cred_t *cr)
 806 {
 807         zfs_oldace_t *oldaclp;
 808         int i;
 809         uint16_t type, iflags;
 810         uint32_t access_mask;
 811         uint64_t who;
 812         void *cookie = NULL;
 813         zfs_acl_node_t *newaclnode;
 814 
 815         ASSERT(aclp->z_version == ZFS_ACL_VERSION_INITIAL);
 816         /*
 817          * First create the ACE in a contiguous piece of memory
 818          * for zfs_copy_ace_2_fuid().
 819          *
 820          * We only convert an ACL once, so this won't happen
 821          * everytime.
 822          */
 823         oldaclp = kmem_alloc(sizeof (zfs_oldace_t) * aclp->z_acl_count,
 824             KM_SLEEP);
 825         i = 0;
 826         while (cookie = zfs_acl_next_ace(aclp, cookie, &who,
 827             &access_mask, &iflags, &type)) {
 828                 oldaclp[i].z_flags = iflags;
 829                 oldaclp[i].z_type = type;
 830                 oldaclp[i].z_fuid = who;
 831                 oldaclp[i++].z_access_mask = access_mask;
 832         }
 833 
 834         newaclnode = zfs_acl_node_alloc(aclp->z_acl_count *
 835             sizeof (zfs_object_ace_t));
 836         aclp->z_ops = zfs_acl_fuid_ops;
 837         VERIFY(zfs_copy_ace_2_fuid(zp->z_zfsvfs, ZTOV(zp)->v_type, aclp,
 838             oldaclp, newaclnode->z_acldata, aclp->z_acl_count,
 839             &newaclnode->z_size, NULL, cr) == 0);
 840         newaclnode->z_ace_count = aclp->z_acl_count;
 841         aclp->z_version = ZFS_ACL_VERSION;
 842         kmem_free(oldaclp, aclp->z_acl_count * sizeof (zfs_oldace_t));
 843 
 844         /*
 845          * Release all previous ACL nodes
 846          */
 847 
 848         zfs_acl_release_nodes(aclp);
 849 
 850         list_insert_head(&aclp->z_acl, newaclnode);
 851 
 852         aclp->z_acl_bytes = newaclnode->z_size;
 853         aclp->z_acl_count = newaclnode->z_ace_count;
 854 
 855 }
 856 
 857 /*
 858  * Convert unix access mask to v4 access mask
 859  */
 860 static uint32_t
 861 zfs_unix_to_v4(uint32_t access_mask)
 862 {
 863         uint32_t new_mask = 0;
 864 
 865         if (access_mask & S_IXOTH)
 866                 new_mask |= ACE_EXECUTE;
 867         if (access_mask & S_IWOTH)
 868                 new_mask |= ACE_WRITE_DATA;
 869         if (access_mask & S_IROTH)
 870                 new_mask |= ACE_READ_DATA;
 871         return (new_mask);
 872 }
 873 
 874 static void
 875 zfs_set_ace(zfs_acl_t *aclp, void *acep, uint32_t access_mask,
 876     uint16_t access_type, uint64_t fuid, uint16_t entry_type)
 877 {
 878         uint16_t type = entry_type & ACE_TYPE_FLAGS;
 879 
 880         aclp->z_ops.ace_mask_set(acep, access_mask);
 881         aclp->z_ops.ace_type_set(acep, access_type);
 882         aclp->z_ops.ace_flags_set(acep, entry_type);
 883         if ((type != ACE_OWNER && type != OWNING_GROUP &&
 884             type != ACE_EVERYONE))
 885                 aclp->z_ops.ace_who_set(acep, fuid);
 886 }
 887 
 888 /*
 889  * Determine mode of file based on ACL.
 890  * Also, create FUIDs for any User/Group ACEs
 891  */
 892 uint64_t
 893 zfs_mode_compute(uint64_t fmode, zfs_acl_t *aclp,
 894     uint64_t *pflags, uint64_t fuid, uint64_t fgid)
 895 {
 896         int             entry_type;
 897         mode_t          mode;
 898         mode_t          seen = 0;
 899         zfs_ace_hdr_t   *acep = NULL;
 900         uint64_t        who;
 901         uint16_t        iflags, type;
 902         uint32_t        access_mask;
 903         boolean_t       an_exec_denied = B_FALSE;
 904 
 905         mode = (fmode & (S_IFMT | S_ISUID | S_ISGID | S_ISVTX));
 906 
 907         while (acep = zfs_acl_next_ace(aclp, acep, &who,
 908             &access_mask, &iflags, &type)) {
 909 
 910                 if (!zfs_acl_valid_ace_type(type, iflags))
 911                         continue;
 912 
 913                 entry_type = (iflags & ACE_TYPE_FLAGS);
 914 
 915                 /*
 916                  * Skip over owner@, group@ or everyone@ inherit only ACEs
 917                  */
 918                 if ((iflags & ACE_INHERIT_ONLY_ACE) &&
 919                     (entry_type == ACE_OWNER || entry_type == ACE_EVERYONE ||
 920                     entry_type == OWNING_GROUP))
 921                         continue;
 922 
 923                 if (entry_type == ACE_OWNER || (entry_type == 0 &&
 924                     who == fuid)) {
 925                         if ((access_mask & ACE_READ_DATA) &&
 926                             (!(seen & S_IRUSR))) {
 927                                 seen |= S_IRUSR;
 928                                 if (type == ALLOW) {
 929                                         mode |= S_IRUSR;
 930                                 }
 931                         }
 932                         if ((access_mask & ACE_WRITE_DATA) &&
 933                             (!(seen & S_IWUSR))) {
 934                                 seen |= S_IWUSR;
 935                                 if (type == ALLOW) {
 936                                         mode |= S_IWUSR;
 937                                 }
 938                         }
 939                         if ((access_mask & ACE_EXECUTE) &&
 940                             (!(seen & S_IXUSR))) {
 941                                 seen |= S_IXUSR;
 942                                 if (type == ALLOW) {
 943                                         mode |= S_IXUSR;
 944                                 }
 945                         }
 946                 } else if (entry_type == OWNING_GROUP ||
 947                     (entry_type == ACE_IDENTIFIER_GROUP && who == fgid)) {
 948                         if ((access_mask & ACE_READ_DATA) &&
 949                             (!(seen & S_IRGRP))) {
 950                                 seen |= S_IRGRP;
 951                                 if (type == ALLOW) {
 952                                         mode |= S_IRGRP;
 953                                 }
 954                         }
 955                         if ((access_mask & ACE_WRITE_DATA) &&
 956                             (!(seen & S_IWGRP))) {
 957                                 seen |= S_IWGRP;
 958                                 if (type == ALLOW) {
 959                                         mode |= S_IWGRP;
 960                                 }
 961                         }
 962                         if ((access_mask & ACE_EXECUTE) &&
 963                             (!(seen & S_IXGRP))) {
 964                                 seen |= S_IXGRP;
 965                                 if (type == ALLOW) {
 966                                         mode |= S_IXGRP;
 967                                 }
 968                         }
 969                 } else if (entry_type == ACE_EVERYONE) {
 970                         if ((access_mask & ACE_READ_DATA)) {
 971                                 if (!(seen & S_IRUSR)) {
 972                                         seen |= S_IRUSR;
 973                                         if (type == ALLOW) {
 974                                                 mode |= S_IRUSR;
 975                                         }
 976                                 }
 977                                 if (!(seen & S_IRGRP)) {
 978                                         seen |= S_IRGRP;
 979                                         if (type == ALLOW) {
 980                                                 mode |= S_IRGRP;
 981                                         }
 982                                 }
 983                                 if (!(seen & S_IROTH)) {
 984                                         seen |= S_IROTH;
 985                                         if (type == ALLOW) {
 986                                                 mode |= S_IROTH;
 987                                         }
 988                                 }
 989                         }
 990                         if ((access_mask & ACE_WRITE_DATA)) {
 991                                 if (!(seen & S_IWUSR)) {
 992                                         seen |= S_IWUSR;
 993                                         if (type == ALLOW) {
 994                                                 mode |= S_IWUSR;
 995                                         }
 996                                 }
 997                                 if (!(seen & S_IWGRP)) {
 998                                         seen |= S_IWGRP;
 999                                         if (type == ALLOW) {
1000                                                 mode |= S_IWGRP;
1001                                         }
1002                                 }
1003                                 if (!(seen & S_IWOTH)) {
1004                                         seen |= S_IWOTH;
1005                                         if (type == ALLOW) {
1006                                                 mode |= S_IWOTH;
1007                                         }
1008                                 }
1009                         }
1010                         if ((access_mask & ACE_EXECUTE)) {
1011                                 if (!(seen & S_IXUSR)) {
1012                                         seen |= S_IXUSR;
1013                                         if (type == ALLOW) {
1014                                                 mode |= S_IXUSR;
1015                                         }
1016                                 }
1017                                 if (!(seen & S_IXGRP)) {
1018                                         seen |= S_IXGRP;
1019                                         if (type == ALLOW) {
1020                                                 mode |= S_IXGRP;
1021                                         }
1022                                 }
1023                                 if (!(seen & S_IXOTH)) {
1024                                         seen |= S_IXOTH;
1025                                         if (type == ALLOW) {
1026                                                 mode |= S_IXOTH;
1027                                         }
1028                                 }
1029                         }
1030                 } else {
1031                         /*
1032                          * Only care if this IDENTIFIER_GROUP or
1033                          * USER ACE denies execute access to someone,
1034                          * mode is not affected
1035                          */
1036                         if ((access_mask & ACE_EXECUTE) && type == DENY)
1037                                 an_exec_denied = B_TRUE;
1038                 }
1039         }
1040 
1041         /*
1042          * Failure to allow is effectively a deny, so execute permission
1043          * is denied if it was never mentioned or if we explicitly
1044          * weren't allowed it.
1045          */
1046         if (!an_exec_denied &&
1047             ((seen & ALL_MODE_EXECS) != ALL_MODE_EXECS ||
1048             (mode & ALL_MODE_EXECS) != ALL_MODE_EXECS))
1049                 an_exec_denied = B_TRUE;
1050 
1051         if (an_exec_denied)
1052                 *pflags &= ~ZFS_NO_EXECS_DENIED;
1053         else
1054                 *pflags |= ZFS_NO_EXECS_DENIED;
1055 
1056         return (mode);
1057 }
1058 
1059 /*
1060  * Read an external acl object.  If the intent is to modify, always
1061  * create a new acl and leave any cached acl in place.
1062  */
1063 static int
1064 zfs_acl_node_read(znode_t *zp, boolean_t have_lock, zfs_acl_t **aclpp,
1065     boolean_t will_modify)
1066 {
1067         zfs_acl_t       *aclp;
1068         int             aclsize;
1069         int             acl_count;
1070         zfs_acl_node_t  *aclnode;
1071         zfs_acl_phys_t  znode_acl;
1072         int             version;
1073         int             error;
1074         boolean_t       drop_lock = B_FALSE;
1075 
1076         ASSERT(MUTEX_HELD(&zp->z_acl_lock));
1077 
1078         if (zp->z_acl_cached && !will_modify) {
1079                 *aclpp = zp->z_acl_cached;
1080                 return (0);
1081         }
1082 
1083         /*
1084          * close race where znode could be upgrade while trying to
1085          * read the znode attributes.
1086          *
1087          * But this could only happen if the file isn't already an SA
1088          * znode
1089          */
1090         if (!zp->z_is_sa && !have_lock) {
1091                 mutex_enter(&zp->z_lock);
1092                 drop_lock = B_TRUE;
1093         }
1094         version = zfs_znode_acl_version(zp);
1095 
1096         if ((error = zfs_acl_znode_info(zp, &aclsize,
1097             &acl_count, &znode_acl)) != 0) {
1098                 goto done;
1099         }
1100 
1101         aclp = zfs_acl_alloc(version);
1102 
1103         aclp->z_acl_count = acl_count;
1104         aclp->z_acl_bytes = aclsize;
1105 
1106         aclnode = zfs_acl_node_alloc(aclsize);
1107         aclnode->z_ace_count = aclp->z_acl_count;
1108         aclnode->z_size = aclsize;
1109 
1110         if (!zp->z_is_sa) {
1111                 if (znode_acl.z_acl_extern_obj) {
1112                         error = dmu_read(zp->z_zfsvfs->z_os,
1113                             znode_acl.z_acl_extern_obj, 0, aclnode->z_size,
1114                             aclnode->z_acldata, DMU_READ_PREFETCH);
1115                 } else {
1116                         bcopy(znode_acl.z_ace_data, aclnode->z_acldata,
1117                             aclnode->z_size);
1118                 }
1119         } else {
1120                 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_ACES(zp->z_zfsvfs),
1121                     aclnode->z_acldata, aclnode->z_size);
1122         }
1123 
1124         if (error != 0) {
1125                 zfs_acl_free(aclp);
1126                 zfs_acl_node_free(aclnode);
1127                 /* convert checksum errors into IO errors */
1128                 if (error == ECKSUM)
1129                         error = SET_ERROR(EIO);
1130                 goto done;
1131         }
1132 
1133         list_insert_head(&aclp->z_acl, aclnode);
1134 
1135         *aclpp = aclp;
1136         if (!will_modify)
1137                 zp->z_acl_cached = aclp;
1138 done:
1139         if (drop_lock)
1140                 mutex_exit(&zp->z_lock);
1141         return (error);
1142 }
1143 
1144 /*ARGSUSED*/
1145 void
1146 zfs_acl_data_locator(void **dataptr, uint32_t *length, uint32_t buflen,
1147     boolean_t start, void *userdata)
1148 {
1149         zfs_acl_locator_cb_t *cb = (zfs_acl_locator_cb_t *)userdata;
1150 
1151         if (start) {
1152                 cb->cb_acl_node = list_head(&cb->cb_aclp->z_acl);
1153         } else {
1154                 cb->cb_acl_node = list_next(&cb->cb_aclp->z_acl,
1155                     cb->cb_acl_node);
1156         }
1157         *dataptr = cb->cb_acl_node->z_acldata;
1158         *length = cb->cb_acl_node->z_size;
1159 }
1160 
1161 int
1162 zfs_acl_chown_setattr(znode_t *zp)
1163 {
1164         int error;
1165         zfs_acl_t *aclp;
1166 
1167         ASSERT(MUTEX_HELD(&zp->z_lock));
1168         ASSERT(MUTEX_HELD(&zp->z_acl_lock));
1169 
1170         if ((error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE)) == 0)
1171                 zp->z_mode = zfs_mode_compute(zp->z_mode, aclp,
1172                     &zp->z_pflags, zp->z_uid, zp->z_gid);
1173         return (error);
1174 }
1175 
1176 /*
1177  * common code for setting ACLs.
1178  *
1179  * This function is called from zfs_mode_update, zfs_perm_init, and zfs_setacl.
1180  * zfs_setacl passes a non-NULL inherit pointer (ihp) to indicate that it's
1181  * already checked the acl and knows whether to inherit.
1182  */
1183 int
1184 zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, dmu_tx_t *tx)
1185 {
1186         int                     error;
1187         zfsvfs_t                *zfsvfs = zp->z_zfsvfs;
1188         dmu_object_type_t       otype;
1189         zfs_acl_locator_cb_t    locate = { 0 };
1190         uint64_t                mode;
1191         sa_bulk_attr_t          bulk[5];
1192         uint64_t                ctime[2];
1193         int                     count = 0;
1194 
1195         mode = zp->z_mode;
1196 
1197         mode = zfs_mode_compute(mode, aclp, &zp->z_pflags,
1198             zp->z_uid, zp->z_gid);
1199 
1200         zp->z_mode = mode;
1201         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
1202             &mode, sizeof (mode));
1203         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
1204             &zp->z_pflags, sizeof (zp->z_pflags));
1205         SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
1206             &ctime, sizeof (ctime));
1207 
1208         if (zp->z_acl_cached) {
1209                 zfs_acl_free(zp->z_acl_cached);
1210                 zp->z_acl_cached = NULL;
1211         }
1212 
1213         /*
1214          * Upgrade needed?
1215          */
1216         if (!zfsvfs->z_use_fuids) {
1217                 otype = DMU_OT_OLDACL;
1218         } else {
1219                 if ((aclp->z_version == ZFS_ACL_VERSION_INITIAL) &&
1220                     (zfsvfs->z_version >= ZPL_VERSION_FUID))
1221                         zfs_acl_xform(zp, aclp, cr);
1222                 ASSERT(aclp->z_version >= ZFS_ACL_VERSION_FUID);
1223                 otype = DMU_OT_ACL;
1224         }
1225 
1226         /*
1227          * Arrgh, we have to handle old on disk format
1228          * as well as newer (preferred) SA format.
1229          */
1230 
1231         if (zp->z_is_sa) { /* the easy case, just update the ACL attribute */
1232                 locate.cb_aclp = aclp;
1233                 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_ACES(zfsvfs),
1234                     zfs_acl_data_locator, &locate, aclp->z_acl_bytes);
1235                 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_COUNT(zfsvfs),
1236                     NULL, &aclp->z_acl_count, sizeof (uint64_t));
1237         } else { /* Painful legacy way */
1238                 zfs_acl_node_t *aclnode;
1239                 uint64_t off = 0;
1240                 zfs_acl_phys_t acl_phys;
1241                 uint64_t aoid;
1242 
1243                 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zfsvfs),
1244                     &acl_phys, sizeof (acl_phys))) != 0)
1245                         return (error);
1246 
1247                 aoid = acl_phys.z_acl_extern_obj;
1248 
1249                 if (aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1250                         /*
1251                          * If ACL was previously external and we are now
1252                          * converting to new ACL format then release old
1253                          * ACL object and create a new one.
1254                          */
1255                         if (aoid &&
1256                             aclp->z_version != acl_phys.z_acl_version) {
1257                                 error = dmu_object_free(zfsvfs->z_os, aoid, tx);
1258                                 if (error)
1259                                         return (error);
1260                                 aoid = 0;
1261                         }
1262                         if (aoid == 0) {
1263                                 aoid = dmu_object_alloc(zfsvfs->z_os,
1264                                     otype, aclp->z_acl_bytes,
1265                                     otype == DMU_OT_ACL ?
1266                                     DMU_OT_SYSACL : DMU_OT_NONE,
1267                                     otype == DMU_OT_ACL ?
1268                                     DN_MAX_BONUSLEN : 0, tx);
1269                         } else {
1270                                 (void) dmu_object_set_blocksize(zfsvfs->z_os,
1271                                     aoid, aclp->z_acl_bytes, 0, tx);
1272                         }
1273                         acl_phys.z_acl_extern_obj = aoid;
1274                         for (aclnode = list_head(&aclp->z_acl); aclnode;
1275                             aclnode = list_next(&aclp->z_acl, aclnode)) {
1276                                 if (aclnode->z_ace_count == 0)
1277                                         continue;
1278                                 dmu_write(zfsvfs->z_os, aoid, off,
1279                                     aclnode->z_size, aclnode->z_acldata, tx);
1280                                 off += aclnode->z_size;
1281                         }
1282                 } else {
1283                         void *start = acl_phys.z_ace_data;
1284                         /*
1285                          * Migrating back embedded?
1286                          */
1287                         if (acl_phys.z_acl_extern_obj) {
1288                                 error = dmu_object_free(zfsvfs->z_os,
1289                                     acl_phys.z_acl_extern_obj, tx);
1290                                 if (error)
1291                                         return (error);
1292                                 acl_phys.z_acl_extern_obj = 0;
1293                         }
1294 
1295                         for (aclnode = list_head(&aclp->z_acl); aclnode;
1296                             aclnode = list_next(&aclp->z_acl, aclnode)) {
1297                                 if (aclnode->z_ace_count == 0)
1298                                         continue;
1299                                 bcopy(aclnode->z_acldata, start,
1300                                     aclnode->z_size);
1301                                 start = (caddr_t)start + aclnode->z_size;
1302                         }
1303                 }
1304                 /*
1305                  * If Old version then swap count/bytes to match old
1306                  * layout of znode_acl_phys_t.
1307                  */
1308                 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
1309                         acl_phys.z_acl_size = aclp->z_acl_count;
1310                         acl_phys.z_acl_count = aclp->z_acl_bytes;
1311                 } else {
1312                         acl_phys.z_acl_size = aclp->z_acl_bytes;
1313                         acl_phys.z_acl_count = aclp->z_acl_count;
1314                 }
1315                 acl_phys.z_acl_version = aclp->z_version;
1316 
1317                 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
1318                     &acl_phys, sizeof (acl_phys));
1319         }
1320 
1321         /*
1322          * Replace ACL wide bits, but first clear them.
1323          */
1324         zp->z_pflags &= ~ZFS_ACL_WIDE_FLAGS;
1325 
1326         zp->z_pflags |= aclp->z_hints;
1327 
1328         if (ace_trivial_common(aclp, 0, zfs_ace_walk) == 0)
1329                 zp->z_pflags |= ZFS_ACL_TRIVIAL;
1330 
1331         zfs_tstamp_update_setup(zp, STATE_CHANGED, NULL, ctime, B_TRUE);
1332         return (sa_bulk_update(zp->z_sa_hdl, bulk, count, tx));
1333 }
1334 
1335 static void
1336 zfs_acl_chmod(vtype_t vtype, uint64_t mode, boolean_t trim, zfs_acl_t *aclp)
1337 {
1338         void            *acep = NULL;
1339         uint64_t        who;
1340         int             new_count, new_bytes;
1341         int             ace_size;
1342         int             entry_type;
1343         uint16_t        iflags, type;
1344         uint32_t        access_mask;
1345         zfs_acl_node_t  *newnode;
1346         size_t          abstract_size = aclp->z_ops.ace_abstract_size();
1347         void            *zacep;
1348         boolean_t       isdir;
1349         trivial_acl_t   masks;
1350 
1351         new_count = new_bytes = 0;
1352 
1353         isdir = (vtype == VDIR);
1354 
1355         acl_trivial_access_masks((mode_t)mode, isdir, &masks);
1356 
1357         newnode = zfs_acl_node_alloc((abstract_size * 6) + aclp->z_acl_bytes);
1358 
1359         zacep = newnode->z_acldata;
1360         if (masks.allow0) {
1361                 zfs_set_ace(aclp, zacep, masks.allow0, ALLOW, -1, ACE_OWNER);
1362                 zacep = (void *)((uintptr_t)zacep + abstract_size);
1363                 new_count++;
1364                 new_bytes += abstract_size;
1365         }
1366         if (masks.deny1) {
1367                 zfs_set_ace(aclp, zacep, masks.deny1, DENY, -1, ACE_OWNER);
1368                 zacep = (void *)((uintptr_t)zacep + abstract_size);
1369                 new_count++;
1370                 new_bytes += abstract_size;
1371         }
1372         if (masks.deny2) {
1373                 zfs_set_ace(aclp, zacep, masks.deny2, DENY, -1, OWNING_GROUP);
1374                 zacep = (void *)((uintptr_t)zacep + abstract_size);
1375                 new_count++;
1376                 new_bytes += abstract_size;
1377         }
1378 
1379         while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
1380             &iflags, &type)) {
1381                 uint16_t inherit_flags;
1382 
1383                 entry_type = (iflags & ACE_TYPE_FLAGS);
1384                 inherit_flags = (iflags & ALL_INHERIT);
1385 
1386                 if ((entry_type == ACE_OWNER || entry_type == ACE_EVERYONE ||
1387                     (entry_type == OWNING_GROUP)) &&
1388                     ((inherit_flags & ACE_INHERIT_ONLY_ACE) == 0)) {
1389                         continue;
1390                 }
1391 
1392                 /*
1393                  * If this ACL has any inheritable ACEs, mark that in
1394                  * the hints (which are later masked into the pflags)
1395                  * so create knows to do inheritance.
1396                  */
1397                 if (isdir && (inherit_flags &
1398                     (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE)))
1399                         aclp->z_hints |= ZFS_INHERIT_ACE;
1400 
1401                 if ((type != ALLOW && type != DENY) ||
1402                     (inherit_flags & ACE_INHERIT_ONLY_ACE)) {
1403                         switch (type) {
1404                         case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
1405                         case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
1406                         case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
1407                         case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
1408                                 aclp->z_hints |= ZFS_ACL_OBJ_ACE;
1409                                 break;
1410                         }
1411                 } else {
1412 
1413                         /*
1414                          * Limit permissions to be no greater than
1415                          * group permissions.
1416                          * The "aclinherit" and "aclmode" properties
1417                          * affect policy for create and chmod(2),
1418                          * respectively.
1419                          */
1420                         if ((type == ALLOW) && trim)
1421                                 access_mask &= masks.group;
1422                 }
1423                 zfs_set_ace(aclp, zacep, access_mask, type, who, iflags);
1424                 ace_size = aclp->z_ops.ace_size(acep);
1425                 zacep = (void *)((uintptr_t)zacep + ace_size);
1426                 new_count++;
1427                 new_bytes += ace_size;
1428         }
1429         zfs_set_ace(aclp, zacep, masks.owner, 0, -1, ACE_OWNER);
1430         zacep = (void *)((uintptr_t)zacep + abstract_size);
1431         zfs_set_ace(aclp, zacep, masks.group, 0, -1, OWNING_GROUP);
1432         zacep = (void *)((uintptr_t)zacep + abstract_size);
1433         zfs_set_ace(aclp, zacep, masks.everyone, 0, -1, ACE_EVERYONE);
1434 
1435         new_count += 3;
1436         new_bytes += abstract_size * 3;
1437         zfs_acl_release_nodes(aclp);
1438         aclp->z_acl_count = new_count;
1439         aclp->z_acl_bytes = new_bytes;
1440         newnode->z_ace_count = new_count;
1441         newnode->z_size = new_bytes;
1442         list_insert_tail(&aclp->z_acl, newnode);
1443 }
1444 
1445 int
1446 zfs_acl_chmod_setattr(znode_t *zp, zfs_acl_t **aclp, uint64_t mode)
1447 {
1448         int error = 0;
1449 
1450         mutex_enter(&zp->z_acl_lock);
1451         mutex_enter(&zp->z_lock);
1452         if (zp->z_zfsvfs->z_acl_mode == ZFS_ACL_DISCARD)
1453                 *aclp = zfs_acl_alloc(zfs_acl_version_zp(zp));
1454         else
1455                 error = zfs_acl_node_read(zp, B_TRUE, aclp, B_TRUE);
1456 
1457         if (error == 0) {
1458                 (*aclp)->z_hints = zp->z_pflags & V4_ACL_WIDE_FLAGS;
1459                 zfs_acl_chmod(ZTOV(zp)->v_type, mode,
1460                     (zp->z_zfsvfs->z_acl_mode == ZFS_ACL_GROUPMASK), *aclp);
1461         }
1462         mutex_exit(&zp->z_lock);
1463         mutex_exit(&zp->z_acl_lock);
1464 
1465         return (error);
1466 }
1467 
1468 /*
1469  * strip off write_owner and write_acl
1470  */
1471 static void
1472 zfs_restricted_update(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, void *acep)
1473 {
1474         uint32_t mask = aclp->z_ops.ace_mask_get(acep);
1475 
1476         if ((zfsvfs->z_acl_inherit == ZFS_ACL_RESTRICTED) &&
1477             (aclp->z_ops.ace_type_get(acep) == ALLOW)) {
1478                 mask &= ~RESTRICTED_CLEAR;
1479                 aclp->z_ops.ace_mask_set(acep, mask);
1480         }
1481 }
1482 
1483 /*
1484  * Should ACE be inherited?
1485  */
1486 static int
1487 zfs_ace_can_use(vtype_t vtype, uint16_t acep_flags)
1488 {
1489         int     iflags = (acep_flags & 0xf);
1490 
1491         if ((vtype == VDIR) && (iflags & ACE_DIRECTORY_INHERIT_ACE))
1492                 return (1);
1493         else if (iflags & ACE_FILE_INHERIT_ACE)
1494                 return (!((vtype == VDIR) &&
1495                     (iflags & ACE_NO_PROPAGATE_INHERIT_ACE)));
1496         return (0);
1497 }
1498 
1499 /*
1500  * inherit inheritable ACEs from parent
1501  */
1502 static zfs_acl_t *
1503 zfs_acl_inherit(zfsvfs_t *zfsvfs, vtype_t vtype, zfs_acl_t *paclp,
1504     uint64_t mode, boolean_t *need_chmod)
1505 {
1506         void            *pacep;
1507         void            *acep;
1508         zfs_acl_node_t  *aclnode;
1509         zfs_acl_t       *aclp = NULL;
1510         uint64_t        who;
1511         uint32_t        access_mask;
1512         uint16_t        iflags, newflags, type;
1513         size_t          ace_size;
1514         void            *data1, *data2;
1515         size_t          data1sz, data2sz;
1516         boolean_t       vdir = vtype == VDIR;
1517         boolean_t       vreg = vtype == VREG;
1518         boolean_t       passthrough, passthrough_x, noallow;
1519 
1520         passthrough_x =
1521             zfsvfs->z_acl_inherit == ZFS_ACL_PASSTHROUGH_X;
1522         passthrough = passthrough_x ||
1523             zfsvfs->z_acl_inherit == ZFS_ACL_PASSTHROUGH;
1524         noallow =
1525             zfsvfs->z_acl_inherit == ZFS_ACL_NOALLOW;
1526 
1527         *need_chmod = B_TRUE;
1528         pacep = NULL;
1529         aclp = zfs_acl_alloc(paclp->z_version);
1530         if (zfsvfs->z_acl_inherit == ZFS_ACL_DISCARD || vtype == VLNK)
1531                 return (aclp);
1532         while (pacep = zfs_acl_next_ace(paclp, pacep, &who,
1533             &access_mask, &iflags, &type)) {
1534 
1535                 /*
1536                  * don't inherit bogus ACEs
1537                  */
1538                 if (!zfs_acl_valid_ace_type(type, iflags))
1539                         continue;
1540 
1541                 if (noallow && type == ALLOW)
1542                         continue;
1543 
1544                 ace_size = aclp->z_ops.ace_size(pacep);
1545 
1546                 if (!zfs_ace_can_use(vtype, iflags))
1547                         continue;
1548 
1549                 /*
1550                  * If owner@, group@, or everyone@ inheritable
1551                  * then zfs_acl_chmod() isn't needed.
1552                  */
1553                 if (passthrough &&
1554                     ((iflags & (ACE_OWNER|ACE_EVERYONE)) ||
1555                     ((iflags & OWNING_GROUP) ==
1556                     OWNING_GROUP)) && (vreg || (vdir && (iflags &
1557                     ACE_DIRECTORY_INHERIT_ACE)))) {
1558                         *need_chmod = B_FALSE;
1559                 }
1560 
1561                 if (!vdir && passthrough_x &&
1562                     ((mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0)) {
1563                         access_mask &= ~ACE_EXECUTE;
1564                 }
1565 
1566                 aclnode = zfs_acl_node_alloc(ace_size);
1567                 list_insert_tail(&aclp->z_acl, aclnode);
1568                 acep = aclnode->z_acldata;
1569 
1570                 zfs_set_ace(aclp, acep, access_mask, type,
1571                     who, iflags|ACE_INHERITED_ACE);
1572 
1573                 /*
1574                  * Copy special opaque data if any
1575                  */
1576                 if ((data1sz = paclp->z_ops.ace_data(pacep, &data1)) != 0) {
1577                         VERIFY((data2sz = aclp->z_ops.ace_data(acep,
1578                             &data2)) == data1sz);
1579                         bcopy(data1, data2, data2sz);
1580                 }
1581 
1582                 aclp->z_acl_count++;
1583                 aclnode->z_ace_count++;
1584                 aclp->z_acl_bytes += aclnode->z_size;
1585                 newflags = aclp->z_ops.ace_flags_get(acep);
1586 
1587                 if (vdir)
1588                         aclp->z_hints |= ZFS_INHERIT_ACE;
1589 
1590                 if ((iflags & ACE_NO_PROPAGATE_INHERIT_ACE) || !vdir) {
1591                         newflags &= ~ALL_INHERIT;
1592                         aclp->z_ops.ace_flags_set(acep,
1593                             newflags|ACE_INHERITED_ACE);
1594                         zfs_restricted_update(zfsvfs, aclp, acep);
1595                         continue;
1596                 }
1597 
1598                 ASSERT(vdir);
1599 
1600                 /*
1601                  * If only FILE_INHERIT is set then turn on
1602                  * inherit_only
1603                  */
1604                 if ((iflags & (ACE_FILE_INHERIT_ACE |
1605                     ACE_DIRECTORY_INHERIT_ACE)) == ACE_FILE_INHERIT_ACE) {
1606                         newflags |= ACE_INHERIT_ONLY_ACE;
1607                         aclp->z_ops.ace_flags_set(acep,
1608                             newflags|ACE_INHERITED_ACE);
1609                 } else {
1610                         newflags &= ~ACE_INHERIT_ONLY_ACE;
1611                         aclp->z_ops.ace_flags_set(acep,
1612                             newflags|ACE_INHERITED_ACE);
1613                 }
1614         }
1615         return (aclp);
1616 }
1617 
1618 /*
1619  * Create file system object initial permissions
1620  * including inheritable ACEs.
1621  */
1622 int
1623 zfs_acl_ids_create(znode_t *dzp, int flag, vattr_t *vap, cred_t *cr,
1624     vsecattr_t *vsecp, zfs_acl_ids_t *acl_ids)
1625 {
1626         int             error;
1627         zfsvfs_t        *zfsvfs = dzp->z_zfsvfs;
1628         zfs_acl_t       *paclp;
1629         gid_t           gid;
1630         boolean_t       need_chmod = B_TRUE;
1631         boolean_t       inherited = B_FALSE;
1632 
1633         bzero(acl_ids, sizeof (zfs_acl_ids_t));
1634         acl_ids->z_mode = MAKEIMODE(vap->va_type, vap->va_mode);
1635 
1636         if (vsecp)
1637                 if ((error = zfs_vsec_2_aclp(zfsvfs, vap->va_type, vsecp, cr,
1638                     &acl_ids->z_fuidp, &acl_ids->z_aclp)) != 0)
1639                         return (error);
1640         /*
1641          * Determine uid and gid.
1642          */
1643         if ((flag & IS_ROOT_NODE) || zfsvfs->z_replay ||
1644             ((flag & IS_XATTR) && (vap->va_type == VDIR))) {
1645                 acl_ids->z_fuid = zfs_fuid_create(zfsvfs,
1646                     (uint64_t)vap->va_uid, cr,
1647                     ZFS_OWNER, &acl_ids->z_fuidp);
1648                 acl_ids->z_fgid = zfs_fuid_create(zfsvfs,
1649                     (uint64_t)vap->va_gid, cr,
1650                     ZFS_GROUP, &acl_ids->z_fuidp);
1651                 gid = vap->va_gid;
1652         } else {
1653                 acl_ids->z_fuid = zfs_fuid_create_cred(zfsvfs, ZFS_OWNER,
1654                     cr, &acl_ids->z_fuidp);
1655                 acl_ids->z_fgid = 0;
1656                 if (vap->va_mask & AT_GID)  {
1657                         acl_ids->z_fgid = zfs_fuid_create(zfsvfs,
1658                             (uint64_t)vap->va_gid,
1659                             cr, ZFS_GROUP, &acl_ids->z_fuidp);
1660                         gid = vap->va_gid;
1661                         if (acl_ids->z_fgid != dzp->z_gid &&
1662                             !groupmember(vap->va_gid, cr) &&
1663                             secpolicy_vnode_create_gid(cr) != 0)
1664                                 acl_ids->z_fgid = 0;
1665                 }
1666                 if (acl_ids->z_fgid == 0) {
1667                         if (dzp->z_mode & S_ISGID) {
1668                                 char            *domain;
1669                                 uint32_t        rid;
1670 
1671                                 acl_ids->z_fgid = dzp->z_gid;
1672                                 gid = zfs_fuid_map_id(zfsvfs, acl_ids->z_fgid,
1673                                     cr, ZFS_GROUP);
1674 
1675                                 if (zfsvfs->z_use_fuids &&
1676                                     IS_EPHEMERAL(acl_ids->z_fgid)) {
1677                                         domain = zfs_fuid_idx_domain(
1678                                             &zfsvfs->z_fuid_idx,
1679                                             FUID_INDEX(acl_ids->z_fgid));
1680                                         rid = FUID_RID(acl_ids->z_fgid);
1681                                         zfs_fuid_node_add(&acl_ids->z_fuidp,
1682                                             domain, rid,
1683                                             FUID_INDEX(acl_ids->z_fgid),
1684                                             acl_ids->z_fgid, ZFS_GROUP);
1685                                 }
1686                         } else {
1687                                 acl_ids->z_fgid = zfs_fuid_create_cred(zfsvfs,
1688                                     ZFS_GROUP, cr, &acl_ids->z_fuidp);
1689                                 gid = crgetgid(cr);
1690                         }
1691                 }
1692         }
1693 
1694         /*
1695          * If we're creating a directory, and the parent directory has the
1696          * set-GID bit set, set in on the new directory.
1697          * Otherwise, if the user is neither privileged nor a member of the
1698          * file's new group, clear the file's set-GID bit.
1699          */
1700 
1701         if (!(flag & IS_ROOT_NODE) && (dzp->z_mode & S_ISGID) &&
1702             (vap->va_type == VDIR)) {
1703                 acl_ids->z_mode |= S_ISGID;
1704         } else {
1705                 if ((acl_ids->z_mode & S_ISGID) &&
1706                     secpolicy_vnode_setids_setgids(cr, gid) != 0)
1707                         acl_ids->z_mode &= ~S_ISGID;
1708         }
1709 
1710         if (acl_ids->z_aclp == NULL) {
1711                 mutex_enter(&dzp->z_acl_lock);
1712                 mutex_enter(&dzp->z_lock);
1713                 if (!(flag & IS_ROOT_NODE) &&
1714                     (dzp->z_pflags & ZFS_INHERIT_ACE) &&
1715                     !(dzp->z_pflags & ZFS_XATTR)) {
1716                         VERIFY(0 == zfs_acl_node_read(dzp, B_TRUE,
1717                             &paclp, B_FALSE));
1718                         acl_ids->z_aclp = zfs_acl_inherit(zfsvfs,
1719                             vap->va_type, paclp, acl_ids->z_mode, &need_chmod);
1720                         inherited = B_TRUE;
1721                 } else {
1722                         acl_ids->z_aclp =
1723                             zfs_acl_alloc(zfs_acl_version_zp(dzp));
1724                         acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL;
1725                 }
1726                 mutex_exit(&dzp->z_lock);
1727                 mutex_exit(&dzp->z_acl_lock);
1728                 if (need_chmod) {
1729                         acl_ids->z_aclp->z_hints |= (vap->va_type == VDIR) ?
1730                             ZFS_ACL_AUTO_INHERIT : 0;
1731                         zfs_acl_chmod(vap->va_type, acl_ids->z_mode,
1732                             (zfsvfs->z_acl_inherit == ZFS_ACL_RESTRICTED),
1733                             acl_ids->z_aclp);
1734                 }
1735         }
1736 
1737         if (inherited || vsecp) {
1738                 acl_ids->z_mode = zfs_mode_compute(acl_ids->z_mode,
1739                     acl_ids->z_aclp, &acl_ids->z_aclp->z_hints,
1740                     acl_ids->z_fuid, acl_ids->z_fgid);
1741                 if (ace_trivial_common(acl_ids->z_aclp, 0, zfs_ace_walk) == 0)
1742                         acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL;
1743         }
1744 
1745         return (0);
1746 }
1747 
1748 /*
1749  * Free ACL and fuid_infop, but not the acl_ids structure
1750  */
1751 void
1752 zfs_acl_ids_free(zfs_acl_ids_t *acl_ids)
1753 {
1754         if (acl_ids->z_aclp)
1755                 zfs_acl_free(acl_ids->z_aclp);
1756         if (acl_ids->z_fuidp)
1757                 zfs_fuid_info_free(acl_ids->z_fuidp);
1758         acl_ids->z_aclp = NULL;
1759         acl_ids->z_fuidp = NULL;
1760 }
1761 
1762 boolean_t
1763 zfs_acl_ids_overquota(zfsvfs_t *zfsvfs, zfs_acl_ids_t *acl_ids)
1764 {
1765         return (zfs_fuid_overquota(zfsvfs, B_FALSE, acl_ids->z_fuid) ||
1766             zfs_fuid_overquota(zfsvfs, B_TRUE, acl_ids->z_fgid));
1767 }
1768 
1769 /*
1770  * Retrieve a file's ACL
1771  */
1772 int
1773 zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
1774 {
1775         zfs_acl_t       *aclp;
1776         ulong_t         mask;
1777         int             error;
1778         int             count = 0;
1779         int             largeace = 0;
1780 
1781         mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT |
1782             VSA_ACE_ACLFLAGS | VSA_ACE_ALLTYPES);
1783 
1784         if (mask == 0)
1785                 return (SET_ERROR(ENOSYS));
1786 
1787         if (error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr))
1788                 return (error);
1789 
1790         mutex_enter(&zp->z_acl_lock);
1791 
1792         error = zfs_acl_node_read(zp, B_FALSE, &aclp, B_FALSE);
1793         if (error != 0) {
1794                 mutex_exit(&zp->z_acl_lock);
1795                 return (error);
1796         }
1797 
1798         /*
1799          * Scan ACL to determine number of ACEs
1800          */
1801         if ((zp->z_pflags & ZFS_ACL_OBJ_ACE) && !(mask & VSA_ACE_ALLTYPES)) {
1802                 void *zacep = NULL;
1803                 uint64_t who;
1804                 uint32_t access_mask;
1805                 uint16_t type, iflags;
1806 
1807                 while (zacep = zfs_acl_next_ace(aclp, zacep,
1808                     &who, &access_mask, &iflags, &type)) {
1809                         switch (type) {
1810                         case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
1811                         case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
1812                         case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
1813                         case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
1814                                 largeace++;
1815                                 continue;
1816                         default:
1817                                 count++;
1818                         }
1819                 }
1820                 vsecp->vsa_aclcnt = count;
1821         } else
1822                 count = (int)aclp->z_acl_count;
1823 
1824         if (mask & VSA_ACECNT) {
1825                 vsecp->vsa_aclcnt = count;
1826         }
1827 
1828         if (mask & VSA_ACE) {
1829                 size_t aclsz;
1830 
1831                 aclsz = count * sizeof (ace_t) +
1832                     sizeof (ace_object_t) * largeace;
1833 
1834                 vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP);
1835                 vsecp->vsa_aclentsz = aclsz;
1836 
1837                 if (aclp->z_version == ZFS_ACL_VERSION_FUID)
1838                         zfs_copy_fuid_2_ace(zp->z_zfsvfs, aclp, cr,
1839                             vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES));
1840                 else {
1841                         zfs_acl_node_t *aclnode;
1842                         void *start = vsecp->vsa_aclentp;
1843 
1844                         for (aclnode = list_head(&aclp->z_acl); aclnode;
1845                             aclnode = list_next(&aclp->z_acl, aclnode)) {
1846                                 bcopy(aclnode->z_acldata, start,
1847                                     aclnode->z_size);
1848                                 start = (caddr_t)start + aclnode->z_size;
1849                         }
1850                         ASSERT((caddr_t)start - (caddr_t)vsecp->vsa_aclentp ==
1851                             aclp->z_acl_bytes);
1852                 }
1853         }
1854         if (mask & VSA_ACE_ACLFLAGS) {
1855                 vsecp->vsa_aclflags = 0;
1856                 if (zp->z_pflags & ZFS_ACL_DEFAULTED)
1857                         vsecp->vsa_aclflags |= ACL_DEFAULTED;
1858                 if (zp->z_pflags & ZFS_ACL_PROTECTED)
1859                         vsecp->vsa_aclflags |= ACL_PROTECTED;
1860                 if (zp->z_pflags & ZFS_ACL_AUTO_INHERIT)
1861                         vsecp->vsa_aclflags |= ACL_AUTO_INHERIT;
1862         }
1863 
1864         mutex_exit(&zp->z_acl_lock);
1865 
1866         return (0);
1867 }
1868 
1869 int
1870 zfs_vsec_2_aclp(zfsvfs_t *zfsvfs, vtype_t obj_type,
1871     vsecattr_t *vsecp, cred_t *cr, zfs_fuid_info_t **fuidp, zfs_acl_t **zaclp)
1872 {
1873         zfs_acl_t *aclp;
1874         zfs_acl_node_t *aclnode;
1875         int aclcnt = vsecp->vsa_aclcnt;
1876         int error;
1877 
1878         if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES || vsecp->vsa_aclcnt <= 0)
1879                 return (SET_ERROR(EINVAL));
1880 
1881         aclp = zfs_acl_alloc(zfs_acl_version(zfsvfs->z_version));
1882 
1883         aclp->z_hints = 0;
1884         aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t));
1885         if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
1886                 if ((error = zfs_copy_ace_2_oldace(obj_type, aclp,
1887                     (ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata,
1888                     aclcnt, &aclnode->z_size)) != 0) {
1889                         zfs_acl_free(aclp);
1890                         zfs_acl_node_free(aclnode);
1891                         return (error);
1892                 }
1893         } else {
1894                 if ((error = zfs_copy_ace_2_fuid(zfsvfs, obj_type, aclp,
1895                     vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt,
1896                     &aclnode->z_size, fuidp, cr)) != 0) {
1897                         zfs_acl_free(aclp);
1898                         zfs_acl_node_free(aclnode);
1899                         return (error);
1900                 }
1901         }
1902         aclp->z_acl_bytes = aclnode->z_size;
1903         aclnode->z_ace_count = aclcnt;
1904         aclp->z_acl_count = aclcnt;
1905         list_insert_head(&aclp->z_acl, aclnode);
1906 
1907         /*
1908          * If flags are being set then add them to z_hints
1909          */
1910         if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) {
1911                 if (vsecp->vsa_aclflags & ACL_PROTECTED)
1912                         aclp->z_hints |= ZFS_ACL_PROTECTED;
1913                 if (vsecp->vsa_aclflags & ACL_DEFAULTED)
1914                         aclp->z_hints |= ZFS_ACL_DEFAULTED;
1915                 if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT)
1916                         aclp->z_hints |= ZFS_ACL_AUTO_INHERIT;
1917         }
1918 
1919         *zaclp = aclp;
1920 
1921         return (0);
1922 }
1923 
1924 /*
1925  * Set a file's ACL
1926  */
1927 int
1928 zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
1929 {
1930         zfsvfs_t        *zfsvfs = zp->z_zfsvfs;
1931         zilog_t         *zilog = zfsvfs->z_log;
1932         ulong_t         mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT);
1933         dmu_tx_t        *tx;
1934         int             error;
1935         zfs_acl_t       *aclp;
1936         zfs_fuid_info_t *fuidp = NULL;
1937         boolean_t       fuid_dirtied;
1938         uint64_t        acl_obj;
1939 
1940         if (mask == 0)
1941                 return (SET_ERROR(ENOSYS));
1942 
1943         if (zp->z_pflags & ZFS_IMMUTABLE)
1944                 return (SET_ERROR(EPERM));
1945 
1946         if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr))
1947                 return (error);
1948 
1949         error = zfs_vsec_2_aclp(zfsvfs, ZTOV(zp)->v_type, vsecp, cr, &fuidp,
1950             &aclp);
1951         if (error)
1952                 return (error);
1953 
1954         /*
1955          * If ACL wide flags aren't being set then preserve any
1956          * existing flags.
1957          */
1958         if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) {
1959                 aclp->z_hints |=
1960                     (zp->z_pflags & V4_ACL_WIDE_FLAGS);
1961         }
1962 top:
1963         mutex_enter(&zp->z_acl_lock);
1964         mutex_enter(&zp->z_lock);
1965 
1966         tx = dmu_tx_create(zfsvfs->z_os);
1967 
1968         dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
1969 
1970         fuid_dirtied = zfsvfs->z_fuid_dirty;
1971         if (fuid_dirtied)
1972                 zfs_fuid_txhold(zfsvfs, tx);
1973 
1974         /*
1975          * If old version and ACL won't fit in bonus and we aren't
1976          * upgrading then take out necessary DMU holds
1977          */
1978 
1979         if ((acl_obj = zfs_external_acl(zp)) != 0) {
1980                 if (zfsvfs->z_version >= ZPL_VERSION_FUID &&
1981                     zfs_znode_acl_version(zp) <= ZFS_ACL_VERSION_INITIAL) {
1982                         dmu_tx_hold_free(tx, acl_obj, 0,
1983                             DMU_OBJECT_END);
1984                         dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
1985                             aclp->z_acl_bytes);
1986                 } else {
1987                         dmu_tx_hold_write(tx, acl_obj, 0, aclp->z_acl_bytes);
1988                 }
1989         } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1990                 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes);
1991         }
1992 
1993         zfs_sa_upgrade_txholds(tx, zp);
1994         error = dmu_tx_assign(tx, TXG_NOWAIT);
1995         if (error) {
1996                 mutex_exit(&zp->z_acl_lock);
1997                 mutex_exit(&zp->z_lock);
1998 
1999                 if (error == ERESTART) {
2000                         dmu_tx_wait(tx);
2001                         dmu_tx_abort(tx);
2002                         goto top;
2003                 }
2004                 dmu_tx_abort(tx);
2005                 zfs_acl_free(aclp);
2006                 return (error);
2007         }
2008 
2009         error = zfs_aclset_common(zp, aclp, cr, tx);
2010         ASSERT(error == 0);
2011         ASSERT(zp->z_acl_cached == NULL);
2012         zp->z_acl_cached = aclp;
2013 
2014         if (fuid_dirtied)
2015                 zfs_fuid_sync(zfsvfs, tx);
2016 
2017         zfs_log_acl(zilog, tx, zp, vsecp, fuidp);
2018 
2019         if (fuidp)
2020                 zfs_fuid_info_free(fuidp);
2021         dmu_tx_commit(tx);
2022 done:
2023         mutex_exit(&zp->z_lock);
2024         mutex_exit(&zp->z_acl_lock);
2025 
2026         return (error);
2027 }
2028 
2029 /*
2030  * Check accesses of interest (AoI) against attributes of the dataset
2031  * such as read-only.  Returns zero if no AoI conflict with dataset
2032  * attributes, otherwise an appropriate errno is returned.
2033  */
2034 static int
2035 zfs_zaccess_dataset_check(znode_t *zp, uint32_t v4_mode)
2036 {
2037         if ((v4_mode & WRITE_MASK) &&
2038             (zp->z_zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) &&
2039             (!IS_DEVVP(ZTOV(zp)) ||
2040             (IS_DEVVP(ZTOV(zp)) && (v4_mode & WRITE_MASK_ATTRS)))) {
2041                 return (SET_ERROR(EROFS));
2042         }
2043 
2044         /*
2045          * Only check for READONLY on non-directories.
2046          */
2047         if ((v4_mode & WRITE_MASK_DATA) &&
2048             (((ZTOV(zp)->v_type != VDIR) &&
2049             (zp->z_pflags & (ZFS_READONLY | ZFS_IMMUTABLE))) ||
2050             (ZTOV(zp)->v_type == VDIR &&
2051             (zp->z_pflags & ZFS_IMMUTABLE)))) {
2052                 return (SET_ERROR(EPERM));
2053         }
2054 
2055         if ((v4_mode & (ACE_DELETE | ACE_DELETE_CHILD)) &&
2056             (zp->z_pflags & ZFS_NOUNLINK)) {
2057                 return (SET_ERROR(EPERM));
2058         }
2059 
2060         if (((v4_mode & (ACE_READ_DATA|ACE_EXECUTE)) &&
2061             (zp->z_pflags & ZFS_AV_QUARANTINED))) {
2062                 return (SET_ERROR(EACCES));
2063         }
2064 
2065         return (0);
2066 }
2067 
2068 /*
2069  * The primary usage of this function is to loop through all of the
2070  * ACEs in the znode, determining what accesses of interest (AoI) to
2071  * the caller are allowed or denied.  The AoI are expressed as bits in
2072  * the working_mode parameter.  As each ACE is processed, bits covered
2073  * by that ACE are removed from the working_mode.  This removal
2074  * facilitates two things.  The first is that when the working mode is
2075  * empty (= 0), we know we've looked at all the AoI. The second is
2076  * that the ACE interpretation rules don't allow a later ACE to undo
2077  * something granted or denied by an earlier ACE.  Removing the
2078  * discovered access or denial enforces this rule.  At the end of
2079  * processing the ACEs, all AoI that were found to be denied are
2080  * placed into the working_mode, giving the caller a mask of denied
2081  * accesses.  Returns:
2082  *      0               if all AoI granted
2083  *      EACCESS         if the denied mask is non-zero
2084  *      other error     if abnormal failure (e.g., IO error)
2085  *
2086  * A secondary usage of the function is to determine if any of the
2087  * AoI are granted.  If an ACE grants any access in
2088  * the working_mode, we immediately short circuit out of the function.
2089  * This mode is chosen by setting anyaccess to B_TRUE.  The
2090  * working_mode is not a denied access mask upon exit if the function
2091  * is used in this manner.
2092  */
2093 static int
2094 zfs_zaccess_aces_check(znode_t *zp, uint32_t *working_mode,
2095     boolean_t anyaccess, cred_t *cr)
2096 {
2097         zfsvfs_t        *zfsvfs = zp->z_zfsvfs;
2098         zfs_acl_t       *aclp;
2099         int             error;
2100         uid_t           uid = crgetuid(cr);
2101         uint64_t        who;
2102         uint16_t        type, iflags;
2103         uint16_t        entry_type;
2104         uint32_t        access_mask;
2105         uint32_t        deny_mask = 0;
2106         zfs_ace_hdr_t   *acep = NULL;
2107         boolean_t       checkit;
2108         uid_t           gowner;
2109         uid_t           fowner;
2110 
2111         zfs_fuid_map_ids(zp, cr, &fowner, &gowner);
2112 
2113         mutex_enter(&zp->z_acl_lock);
2114 
2115         error = zfs_acl_node_read(zp, B_FALSE, &aclp, B_FALSE);
2116         if (error != 0) {
2117                 mutex_exit(&zp->z_acl_lock);
2118                 return (error);
2119         }
2120 
2121         ASSERT(zp->z_acl_cached);
2122 
2123         while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
2124             &iflags, &type)) {
2125                 uint32_t mask_matched;
2126 
2127                 if (!zfs_acl_valid_ace_type(type, iflags))
2128                         continue;
2129 
2130                 if (ZTOV(zp)->v_type == VDIR && (iflags & ACE_INHERIT_ONLY_ACE))
2131                         continue;
2132 
2133                 /* Skip ACE if it does not affect any AoI */
2134                 mask_matched = (access_mask & *working_mode);
2135                 if (!mask_matched)
2136                         continue;
2137 
2138                 entry_type = (iflags & ACE_TYPE_FLAGS);
2139 
2140                 checkit = B_FALSE;
2141 
2142                 switch (entry_type) {
2143                 case ACE_OWNER:
2144                         if (uid == fowner)
2145                                 checkit = B_TRUE;
2146                         break;
2147                 case OWNING_GROUP:
2148                         who = gowner;
2149                         /*FALLTHROUGH*/
2150                 case ACE_IDENTIFIER_GROUP:
2151                         checkit = zfs_groupmember(zfsvfs, who, cr);
2152                         break;
2153                 case ACE_EVERYONE:
2154                         checkit = B_TRUE;
2155                         break;
2156 
2157                 /* USER Entry */
2158                 default:
2159                         if (entry_type == 0) {
2160                                 uid_t newid;
2161 
2162                                 newid = zfs_fuid_map_id(zfsvfs, who, cr,
2163                                     ZFS_ACE_USER);
2164                                 if (newid != IDMAP_WK_CREATOR_OWNER_UID &&
2165                                     uid == newid)
2166                                         checkit = B_TRUE;
2167                                 break;
2168                         } else {
2169                                 mutex_exit(&zp->z_acl_lock);
2170                                 return (SET_ERROR(EIO));
2171                         }
2172                 }
2173 
2174                 if (checkit) {
2175                         if (type == DENY) {
2176                                 DTRACE_PROBE3(zfs__ace__denies,
2177                                     znode_t *, zp,
2178                                     zfs_ace_hdr_t *, acep,
2179                                     uint32_t, mask_matched);
2180                                 deny_mask |= mask_matched;
2181                         } else {
2182                                 DTRACE_PROBE3(zfs__ace__allows,
2183                                     znode_t *, zp,
2184                                     zfs_ace_hdr_t *, acep,
2185                                     uint32_t, mask_matched);
2186                                 if (anyaccess) {
2187                                         mutex_exit(&zp->z_acl_lock);
2188                                         return (0);
2189                                 }
2190                         }
2191                         *working_mode &= ~mask_matched;
2192                 }
2193 
2194                 /* Are we done? */
2195                 if (*working_mode == 0)
2196                         break;
2197         }
2198 
2199         mutex_exit(&zp->z_acl_lock);
2200 
2201         /* Put the found 'denies' back on the working mode */
2202         if (deny_mask) {
2203                 *working_mode |= deny_mask;
2204                 return (SET_ERROR(EACCES));
2205         } else if (*working_mode) {
2206                 return (-1);
2207         }
2208 
2209         return (0);
2210 }
2211 
2212 /*
2213  * Return true if any access whatsoever granted, we don't actually
2214  * care what access is granted.
2215  */
2216 boolean_t
2217 zfs_has_access(znode_t *zp, cred_t *cr)
2218 {
2219         uint32_t have = ACE_ALL_PERMS;
2220 
2221         if (zfs_zaccess_aces_check(zp, &have, B_TRUE, cr) != 0) {
2222                 uid_t owner;
2223 
2224                 owner = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_uid, cr, ZFS_OWNER);
2225                 return (secpolicy_vnode_any_access(cr, ZTOV(zp), owner) == 0);
2226         }
2227         return (B_TRUE);
2228 }
2229 
2230 static int
2231 zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode,
2232     boolean_t *check_privs, boolean_t skipaclchk, cred_t *cr)
2233 {
2234         zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2235         int err;
2236 
2237         *working_mode = v4_mode;
2238         *check_privs = B_TRUE;
2239 
2240         /*
2241          * Short circuit empty requests
2242          */
2243         if (v4_mode == 0 || zfsvfs->z_replay) {
2244                 *working_mode = 0;
2245                 return (0);
2246         }
2247 
2248         if ((err = zfs_zaccess_dataset_check(zp, v4_mode)) != 0) {
2249                 *check_privs = B_FALSE;
2250                 return (err);
2251         }
2252 
2253         /*
2254          * The caller requested that the ACL check be skipped.  This
2255          * would only happen if the caller checked VOP_ACCESS() with a
2256          * 32 bit ACE mask and already had the appropriate permissions.
2257          */
2258         if (skipaclchk) {
2259                 *working_mode = 0;
2260                 return (0);
2261         }
2262 
2263         return (zfs_zaccess_aces_check(zp, working_mode, B_FALSE, cr));
2264 }
2265 
2266 static int
2267 zfs_zaccess_append(znode_t *zp, uint32_t *working_mode, boolean_t *check_privs,
2268     cred_t *cr)
2269 {
2270         if (*working_mode != ACE_WRITE_DATA)
2271                 return (SET_ERROR(EACCES));
2272 
2273         return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode,
2274             check_privs, B_FALSE, cr));
2275 }
2276 
2277 int
2278 zfs_fastaccesschk_execute(znode_t *zdp, cred_t *cr)
2279 {
2280         boolean_t owner = B_FALSE;
2281         boolean_t groupmbr = B_FALSE;
2282         boolean_t is_attr;
2283         uid_t uid = crgetuid(cr);
2284         int error;
2285 
2286         if (zdp->z_pflags & ZFS_AV_QUARANTINED)
2287                 return (SET_ERROR(EACCES));
2288 
2289         is_attr = ((zdp->z_pflags & ZFS_XATTR) &&
2290             (ZTOV(zdp)->v_type == VDIR));
2291         if (is_attr)
2292                 goto slow;
2293 
2294 
2295         mutex_enter(&zdp->z_acl_lock);
2296 
2297         if (zdp->z_pflags & ZFS_NO_EXECS_DENIED) {
2298                 mutex_exit(&zdp->z_acl_lock);
2299                 return (0);
2300         }
2301 
2302         if (FUID_INDEX(zdp->z_uid) != 0 || FUID_INDEX(zdp->z_gid) != 0) {
2303                 mutex_exit(&zdp->z_acl_lock);
2304                 goto slow;
2305         }
2306 
2307         if (uid == zdp->z_uid) {
2308                 owner = B_TRUE;
2309                 if (zdp->z_mode & S_IXUSR) {
2310                         mutex_exit(&zdp->z_acl_lock);
2311                         return (0);
2312                 } else {
2313                         mutex_exit(&zdp->z_acl_lock);
2314                         goto slow;
2315                 }
2316         }
2317         if (groupmember(zdp->z_gid, cr)) {
2318                 groupmbr = B_TRUE;
2319                 if (zdp->z_mode & S_IXGRP) {
2320                         mutex_exit(&zdp->z_acl_lock);
2321                         return (0);
2322                 } else {
2323                         mutex_exit(&zdp->z_acl_lock);
2324                         goto slow;
2325                 }
2326         }
2327         if (!owner && !groupmbr) {
2328                 if (zdp->z_mode & S_IXOTH) {
2329                         mutex_exit(&zdp->z_acl_lock);
2330                         return (0);
2331                 }
2332         }
2333 
2334         mutex_exit(&zdp->z_acl_lock);
2335 
2336 slow:
2337         DTRACE_PROBE(zfs__fastpath__execute__access__miss);
2338         ZFS_ENTER(zdp->z_zfsvfs);
2339         error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr);
2340         ZFS_EXIT(zdp->z_zfsvfs);
2341         return (error);
2342 }
2343 
2344 /*
2345  * Determine whether Access should be granted/denied.
2346  *
2347  * The least priv subsytem is always consulted as a basic privilege
2348  * can define any form of access.
2349  */
2350 int
2351 zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr)
2352 {
2353         uint32_t        working_mode;
2354         int             error;
2355         int             is_attr;
2356         boolean_t       check_privs;
2357         znode_t         *xzp;
2358         znode_t         *check_zp = zp;
2359         mode_t          needed_bits;
2360         uid_t           owner;
2361 
2362         is_attr = ((zp->z_pflags & ZFS_XATTR) && (ZTOV(zp)->v_type == VDIR));
2363 
2364         /*
2365          * If attribute then validate against base file
2366          */
2367         if (is_attr) {
2368                 uint64_t        parent;
2369 
2370                 if ((error = sa_lookup(zp->z_sa_hdl,
2371                     SA_ZPL_PARENT(zp->z_zfsvfs), &parent,
2372                     sizeof (parent))) != 0)
2373                         return (error);
2374 
2375                 if ((error = zfs_zget(zp->z_zfsvfs,
2376                     parent, &xzp)) != 0)    {
2377                         return (error);
2378                 }
2379 
2380                 check_zp = xzp;
2381 
2382                 /*
2383                  * fixup mode to map to xattr perms
2384                  */
2385 
2386                 if (mode & (ACE_WRITE_DATA|ACE_APPEND_DATA)) {
2387                         mode &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA);
2388                         mode |= ACE_WRITE_NAMED_ATTRS;
2389                 }
2390 
2391                 if (mode & (ACE_READ_DATA|ACE_EXECUTE)) {
2392                         mode &= ~(ACE_READ_DATA|ACE_EXECUTE);
2393                         mode |= ACE_READ_NAMED_ATTRS;
2394                 }
2395         }
2396 
2397         owner = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_uid, cr, ZFS_OWNER);
2398         /*
2399          * Map the bits required to the standard vnode flags VREAD|VWRITE|VEXEC
2400          * in needed_bits.  Map the bits mapped by working_mode (currently
2401          * missing) in missing_bits.
2402          * Call secpolicy_vnode_access2() with (needed_bits & ~checkmode),
2403          * needed_bits.
2404          */
2405         needed_bits = 0;
2406 
2407         working_mode = mode;
2408         if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) &&
2409             owner == crgetuid(cr))
2410                 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES);
2411 
2412         if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS|
2413             ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE))
2414                 needed_bits |= VREAD;
2415         if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS|
2416             ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE))
2417                 needed_bits |= VWRITE;
2418         if (working_mode & ACE_EXECUTE)
2419                 needed_bits |= VEXEC;
2420 
2421         if ((error = zfs_zaccess_common(check_zp, mode, &working_mode,
2422             &check_privs, skipaclchk, cr)) == 0) {
2423                 if (is_attr)
2424                         VN_RELE(ZTOV(xzp));
2425                 return (secpolicy_vnode_access2(cr, ZTOV(zp), owner,
2426                     needed_bits, needed_bits));
2427         }
2428 
2429         if (error && !check_privs) {
2430                 if (is_attr)
2431                         VN_RELE(ZTOV(xzp));
2432                 return (error);
2433         }
2434 
2435         if (error && (flags & V_APPEND)) {
2436                 error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr);
2437         }
2438 
2439         if (error && check_privs) {
2440                 mode_t          checkmode = 0;
2441 
2442                 /*
2443                  * First check for implicit owner permission on
2444                  * read_acl/read_attributes
2445                  */
2446 
2447                 error = 0;
2448                 ASSERT(working_mode != 0);
2449 
2450                 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES) &&
2451                     owner == crgetuid(cr)))
2452                         working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES);
2453 
2454                 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS|
2455                     ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE))
2456                         checkmode |= VREAD;
2457                 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS|
2458                     ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE))
2459                         checkmode |= VWRITE;
2460                 if (working_mode & ACE_EXECUTE)
2461                         checkmode |= VEXEC;
2462 
2463                 error = secpolicy_vnode_access2(cr, ZTOV(check_zp), owner,
2464                     needed_bits & ~checkmode, needed_bits);
2465 
2466                 if (error == 0 && (working_mode & ACE_WRITE_OWNER))
2467                         error = secpolicy_vnode_chown(cr, owner);
2468                 if (error == 0 && (working_mode & ACE_WRITE_ACL))
2469                         error = secpolicy_vnode_setdac(cr, owner);
2470 
2471                 if (error == 0 && (working_mode &
2472                     (ACE_DELETE|ACE_DELETE_CHILD)))
2473                         error = secpolicy_vnode_remove(cr);
2474 
2475                 if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) {
2476                         error = secpolicy_vnode_chown(cr, owner);
2477                 }
2478                 if (error == 0) {
2479                         /*
2480                          * See if any bits other than those already checked
2481                          * for are still present.  If so then return EACCES
2482                          */
2483                         if (working_mode & ~(ZFS_CHECKED_MASKS)) {
2484                                 error = SET_ERROR(EACCES);
2485                         }
2486                 }
2487         } else if (error == 0) {
2488                 error = secpolicy_vnode_access2(cr, ZTOV(zp), owner,
2489                     needed_bits, needed_bits);
2490         }
2491 
2492 
2493         if (is_attr)
2494                 VN_RELE(ZTOV(xzp));
2495 
2496         return (error);
2497 }
2498 
2499 /*
2500  * Translate traditional unix VREAD/VWRITE/VEXEC mode into
2501  * native ACL format and call zfs_zaccess()
2502  */
2503 int
2504 zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr)
2505 {
2506         return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr));
2507 }
2508 
2509 /*
2510  * Access function for secpolicy_vnode_setattr
2511  */
2512 int
2513 zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr)
2514 {
2515         int v4_mode = zfs_unix_to_v4(mode >> 6);
2516 
2517         return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr));
2518 }
2519 
2520 static int
2521 zfs_delete_final_check(znode_t *zp, znode_t *dzp,
2522     mode_t available_perms, cred_t *cr)
2523 {
2524         int error;
2525         uid_t downer;
2526 
2527         downer = zfs_fuid_map_id(dzp->z_zfsvfs, dzp->z_uid, cr, ZFS_OWNER);
2528 
2529         error = secpolicy_vnode_access2(cr, ZTOV(dzp),
2530             downer, available_perms, VWRITE|VEXEC);
2531 
2532         if (error == 0)
2533                 error = zfs_sticky_remove_access(dzp, zp, cr);
2534 
2535         return (error);
2536 }
2537 
2538 /*
2539  * Determine whether Access should be granted/deny, without
2540  * consulting least priv subsystem.
2541  *
2542  * The following chart is the recommended NFSv4 enforcement for
2543  * ability to delete an object.
2544  *
2545  *      -------------------------------------------------------
2546  *      |   Parent Dir  |           Target Object Permissions |
2547  *      |  permissions  |                                     |
2548  *      -------------------------------------------------------
2549  *      |               | ACL Allows | ACL Denies| Delete     |
2550  *      |               |  Delete    |  Delete   | unspecified|
2551  *      -------------------------------------------------------
2552  *      |  ACL Allows   | Permit     | Permit    | Permit     |
2553  *      |  DELETE_CHILD |                                     |
2554  *      -------------------------------------------------------
2555  *      |  ACL Denies   | Permit     | Deny      | Deny       |
2556  *      |  DELETE_CHILD |            |           |            |
2557  *      -------------------------------------------------------
2558  *      | ACL specifies |            |           |            |
2559  *      | only allow    | Permit     | Permit    | Permit     |
2560  *      | write and     |            |           |            |
2561  *      | execute       |            |           |            |
2562  *      -------------------------------------------------------
2563  *      | ACL denies    |            |           |            |
2564  *      | write and     | Permit     | Deny      | Deny       |
2565  *      | execute       |            |           |            |
2566  *      -------------------------------------------------------
2567  *         ^
2568  *         |
2569  *         No search privilege, can't even look up file?
2570  *
2571  */
2572 int
2573 zfs_zaccess_delete(znode_t *dzp, znode_t *zp, cred_t *cr)
2574 {
2575         uint32_t dzp_working_mode = 0;
2576         uint32_t zp_working_mode = 0;
2577         int dzp_error, zp_error;
2578         mode_t available_perms;
2579         boolean_t dzpcheck_privs = B_TRUE;
2580         boolean_t zpcheck_privs = B_TRUE;
2581 
2582         /*
2583          * We want specific DELETE permissions to
2584          * take precedence over WRITE/EXECUTE.  We don't
2585          * want an ACL such as this to mess us up.
2586          * user:joe:write_data:deny,user:joe:delete:allow
2587          *
2588          * However, deny permissions may ultimately be overridden
2589          * by secpolicy_vnode_access().
2590          *
2591          * We will ask for all of the necessary permissions and then
2592          * look at the working modes from the directory and target object
2593          * to determine what was found.
2594          */
2595 
2596         if (zp->z_pflags & (ZFS_IMMUTABLE | ZFS_NOUNLINK))
2597                 return (SET_ERROR(EPERM));
2598 
2599         /*
2600          * First row
2601          * If the directory permissions allow the delete, we are done.
2602          */
2603         if ((dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD,
2604             &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0)
2605                 return (0);
2606 
2607         /*
2608          * If target object has delete permission then we are done
2609          */
2610         if ((zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode,
2611             &zpcheck_privs, B_FALSE, cr)) == 0)
2612                 return (0);
2613 
2614         ASSERT(dzp_error && zp_error);
2615 
2616         if (!dzpcheck_privs)
2617                 return (dzp_error);
2618         if (!zpcheck_privs)
2619                 return (zp_error);
2620 
2621         /*
2622          * Second row
2623          *
2624          * If directory returns EACCES then delete_child was denied
2625          * due to deny delete_child.  In this case send the request through
2626          * secpolicy_vnode_remove().  We don't use zfs_delete_final_check()
2627          * since that *could* allow the delete based on write/execute permission
2628          * and we want delete permissions to override write/execute.
2629          */
2630 
2631         if (dzp_error == EACCES)
2632                 return (secpolicy_vnode_remove(cr));
2633 
2634         /*
2635          * Third Row
2636          * only need to see if we have write/execute on directory.
2637          */
2638 
2639         dzp_error = zfs_zaccess_common(dzp, ACE_EXECUTE|ACE_WRITE_DATA,
2640             &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr);
2641 
2642         if (dzp_error != 0 && !dzpcheck_privs)
2643                 return (dzp_error);
2644 
2645         /*
2646          * Fourth row
2647          */
2648 
2649         available_perms = (dzp_working_mode & ACE_WRITE_DATA) ? 0 : VWRITE;
2650         available_perms |= (dzp_working_mode & ACE_EXECUTE) ? 0 : VEXEC;
2651 
2652         return (zfs_delete_final_check(zp, dzp, available_perms, cr));
2653 
2654 }
2655 
2656 int
2657 zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp,
2658     znode_t *tzp, cred_t *cr)
2659 {
2660         int add_perm;
2661         int error;
2662 
2663         if (szp->z_pflags & ZFS_AV_QUARANTINED)
2664                 return (SET_ERROR(EACCES));
2665 
2666         add_perm = (ZTOV(szp)->v_type == VDIR) ?
2667             ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE;
2668 
2669         /*
2670          * Rename permissions are combination of delete permission +
2671          * add file/subdir permission.
2672          */
2673 
2674         /*
2675          * first make sure we do the delete portion.
2676          *
2677          * If that succeeds then check for add_file/add_subdir permissions
2678          */
2679 
2680         if (error = zfs_zaccess_delete(sdzp, szp, cr))
2681                 return (error);
2682 
2683         /*
2684          * If we have a tzp, see if we can delete it?
2685          */
2686         if (tzp) {
2687                 if (error = zfs_zaccess_delete(tdzp, tzp, cr))
2688                         return (error);
2689         }
2690 
2691         /*
2692          * Now check for add permissions
2693          */
2694         error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr);
2695 
2696         return (error);
2697 }