fs/ksmbd/smb_common.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
   4  *   Copyright (C) 2018 Namjae Jeon <linkinjeon@kernel.org>
   5  */
   6
   7 #include "smb_common.h"
   8 #include "server.h"
   9 #include "misc.h"
  10 #include "smbstatus.h"
  11 #include "connection.h"
  12 #include "ksmbd_work.h"
  13 #include "mgmt/user_session.h"
  14 #include "mgmt/user_config.h"
  15 #include "mgmt/tree_connect.h"
  16 #include "mgmt/share_config.h"
  17
  18 /*for shortname implementation */
  19 static const char basechars[43] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_-!@#$%";
  20 #define MANGLE_BASE (sizeof(basechars) / sizeof(char) - 1)
  21 #define MAGIC_CHAR '~'
  22 #define PERIOD '.'
  23 #define mangle(V) ((char)(basechars[(V) % MANGLE_BASE]))
  24
  25 struct smb_protocol {
  26         int             index;
  27         char            *name;
  28         char            *prot;
  29         __u16           prot_id;
  30 };
  31
  32 static struct smb_protocol smb1_protos[] = {
  33         {
  34                 SMB21_PROT,
  35                 "\2SMB 2.1",
  36                 "SMB2_10",
  37                 SMB21_PROT_ID
  38         },
  39         {
  40                 SMB2X_PROT,
  41                 "\2SMB 2.???",
  42                 "SMB2_22",
  43                 SMB2X_PROT_ID
  44         },
  45 };
  46
  47 static struct smb_protocol smb2_protos[] = {
  48         {
  49                 SMB21_PROT,
  50                 "\2SMB 2.1",
  51                 "SMB2_10",
  52                 SMB21_PROT_ID
  53         },
  54         {
  55                 SMB30_PROT,
  56                 "\2SMB 3.0",
  57                 "SMB3_00",
  58                 SMB30_PROT_ID
  59         },
  60         {
  61                 SMB302_PROT,
  62                 "\2SMB 3.02",
  63                 "SMB3_02",
  64                 SMB302_PROT_ID
  65         },
  66         {
  67                 SMB311_PROT,
  68                 "\2SMB 3.1.1",
  69                 "SMB3_11",
  70                 SMB311_PROT_ID
  71         },
  72 };
  73
  74 unsigned int ksmbd_server_side_copy_max_chunk_count(void)
  75 {
  76         return 256;
  77 }
  78
  79 unsigned int ksmbd_server_side_copy_max_chunk_size(void)
  80 {
  81         return (2U << 30) - 1;
  82 }
  83
  84 unsigned int ksmbd_server_side_copy_max_total_size(void)
  85 {
  86         return (2U << 30) - 1;
  87 }
  88
  89 inline int ksmbd_min_protocol(void)
  90 {
  91         return SMB21_PROT;
  92 }
  93
  94 inline int ksmbd_max_protocol(void)
  95 {
  96         return SMB311_PROT;
  97 }
  98
  99 int ksmbd_lookup_protocol_idx(char *str)
 100 {
 101         int offt = ARRAY_SIZE(smb1_protos) - 1;
 102         int len = strlen(str);
 103
 104         while (offt >= 0) {
 105                 if (!strncmp(str, smb1_protos[offt].prot, len)) {
 106                         ksmbd_debug(SMB, "selected %s dialect idx = %d\n",
 107                                     smb1_protos[offt].prot, offt);
 108                         return smb1_protos[offt].index;
 109                 }
 110                 offt--;
 111         }
 112
 113         offt = ARRAY_SIZE(smb2_protos) - 1;
 114         while (offt >= 0) {
 115                 if (!strncmp(str, smb2_protos[offt].prot, len)) {
 116                         ksmbd_debug(SMB, "selected %s dialect idx = %d\n",
 117                                     smb2_protos[offt].prot, offt);
 118                         return smb2_protos[offt].index;
 119                 }
 120                 offt--;
 121         }
 122         return -1;
 123 }
 124
 125 /**
 126  * ksmbd_verify_smb_message() - check for valid smb2 request header
 127  * @work:       smb work
 128  *
 129  * check for valid smb signature and packet direction(request/response)
 130  *
 131  * Return:      0 on success, otherwise -EINVAL
 132  */
 133 int ksmbd_verify_smb_message(struct ksmbd_work *work)
 134 {
 135         struct smb2_hdr *smb2_hdr = ksmbd_req_buf_next(work);
 136         struct smb_hdr *hdr;
 137
 138         if (smb2_hdr->ProtocolId == SMB2_PROTO_NUMBER)
 139                 return ksmbd_smb2_check_message(work);
 140
 141         hdr = work->request_buf;
 142         if (*(__le32 *)hdr->Protocol == SMB1_PROTO_NUMBER &&
 143             hdr->Command == SMB_COM_NEGOTIATE) {
 144                 work->conn->outstanding_credits++;
 145                 return 0;
 146         }
 147
 148         return -EINVAL;
 149 }
 150
 151 /**
 152  * ksmbd_smb_request() - check for valid smb request type
 153  * @conn:       connection instance
 154  *
 155  * Return:      true on success, otherwise false
 156  */
 157 bool ksmbd_smb_request(struct ksmbd_conn *conn)
 158 {
 159         return conn->request_buf[0] == 0;
 160 }
 161
 162 static bool supported_protocol(int idx)
 163 {
 164         if (idx == SMB2X_PROT &&
 165             (server_conf.min_protocol >= SMB21_PROT ||
 166              server_conf.max_protocol <= SMB311_PROT))
 167                 return true;
 168
 169         return (server_conf.min_protocol <= idx &&
 170                 idx <= server_conf.max_protocol);
 171 }
 172
 173 static char *next_dialect(char *dialect, int *next_off, int bcount)
 174 {
 175         dialect = dialect + *next_off;
 176         *next_off = strnlen(dialect, bcount);
 177         if (dialect[*next_off] != '\0')
 178                 return NULL;
 179         return dialect;
 180 }
 181
 182 static int ksmbd_lookup_dialect_by_name(char *cli_dialects, __le16 byte_count)
 183 {
 184         int i, seq_num, bcount, next;
 185         char *dialect;
 186
 187         for (i = ARRAY_SIZE(smb1_protos) - 1; i >= 0; i--) {
 188                 seq_num = 0;
 189                 next = 0;
 190                 dialect = cli_dialects;
 191                 bcount = le16_to_cpu(byte_count);
 192                 do {
 193                         dialect = next_dialect(dialect, &next, bcount);
 194                         if (!dialect)
 195                                 break;
 196                         ksmbd_debug(SMB, "client requested dialect %s\n",
 197                                     dialect);
 198                         if (!strcmp(dialect, smb1_protos[i].name)) {
 199                                 if (supported_protocol(smb1_protos[i].index)) {
 200                                         ksmbd_debug(SMB,
 201                                                     "selected %s dialect\n",
 202                                                     smb1_protos[i].name);
 203                                         if (smb1_protos[i].index == SMB1_PROT)
 204                                                 return seq_num;
 205                                         return smb1_protos[i].prot_id;
 206                                 }
 207                         }
 208                         seq_num++;
 209                         bcount -= (++next);
 210                 } while (bcount > 0);
 211         }
 212
 213         return BAD_PROT_ID;
 214 }
 215
 216 int ksmbd_lookup_dialect_by_id(__le16 *cli_dialects, __le16 dialects_count)
 217 {
 218         int i;
 219         int count;
 220
 221         for (i = ARRAY_SIZE(smb2_protos) - 1; i >= 0; i--) {
 222                 count = le16_to_cpu(dialects_count);
 223                 while (--count >= 0) {
 224                         ksmbd_debug(SMB, "client requested dialect 0x%x\n",
 225                                     le16_to_cpu(cli_dialects[count]));
 226                         if (le16_to_cpu(cli_dialects[count]) !=
 227                                         smb2_protos[i].prot_id)
 228                                 continue;
 229
 230                         if (supported_protocol(smb2_protos[i].index)) {
 231                                 ksmbd_debug(SMB, "selected %s dialect\n",
 232                                             smb2_protos[i].name);
 233                                 return smb2_protos[i].prot_id;
 234                         }
 235                 }
 236         }
 237
 238         return BAD_PROT_ID;
 239 }
 240
 241 static int ksmbd_negotiate_smb_dialect(void *buf)
 242 {
 243         int smb_buf_length = get_rfc1002_len(buf);
 244         __le32 proto = ((struct smb2_hdr *)smb2_get_msg(buf))->ProtocolId;
 245
 246         if (proto == SMB2_PROTO_NUMBER) {
 247                 struct smb2_negotiate_req *req;
 248                 int smb2_neg_size =
 249                         offsetof(struct smb2_negotiate_req, Dialects);
 250
 251                 req = (struct smb2_negotiate_req *)smb2_get_msg(buf);
 252                 if (smb2_neg_size > smb_buf_length)
 253                         goto err_out;
 254
 255                 if (smb2_neg_size + le16_to_cpu(req->DialectCount) * sizeof(__le16) >
 256                     smb_buf_length)
 257                         goto err_out;
 258
 259                 return ksmbd_lookup_dialect_by_id(req->Dialects,
 260                                                   req->DialectCount);
 261         }
 262
 263         proto = *(__le32 *)((struct smb_hdr *)buf)->Protocol;
 264         if (proto == SMB1_PROTO_NUMBER) {
 265                 struct smb_negotiate_req *req;
 266
 267                 req = (struct smb_negotiate_req *)buf;
 268                 if (le16_to_cpu(req->ByteCount) < 2)
 269                         goto err_out;
 270
 271                 if (offsetof(struct smb_negotiate_req, DialectsArray) - 4 +
 272                         le16_to_cpu(req->ByteCount) > smb_buf_length) {
 273                         goto err_out;
 274                 }
 275
 276                 return ksmbd_lookup_dialect_by_name(req->DialectsArray,
 277                                                     req->ByteCount);
 278         }
 279
 280 err_out:
 281         return BAD_PROT_ID;
 282 }
 283
 284 int ksmbd_init_smb_server(struct ksmbd_work *work)
 285 {
 286         struct ksmbd_conn *conn = work->conn;
 287
 288         if (conn->need_neg == false)
 289                 return 0;
 290
 291         init_smb3_11_server(conn);
 292
 293         if (conn->ops->get_cmd_val(work) != SMB_COM_NEGOTIATE)
 294                 conn->need_neg = false;
 295         return 0;
 296 }
 297
 298 int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, int info_level,
 299                                       struct ksmbd_file *dir,
 300                                       struct ksmbd_dir_info *d_info,
 301                                       char *search_pattern,
 302                                       int (*fn)(struct ksmbd_conn *, int,
 303                                                 struct ksmbd_dir_info *,
 304                                                 struct ksmbd_kstat *))
 305 {
 306         int i, rc = 0;
 307         struct ksmbd_conn *conn = work->conn;
 308         struct user_namespace *user_ns = file_mnt_user_ns(dir->filp);
 309
 310         for (i = 0; i < 2; i++) {
 311                 struct kstat kstat;
 312                 struct ksmbd_kstat ksmbd_kstat;
 313                 struct dentry *dentry;
 314
 315                 if (!dir->dot_dotdot[i]) { /* fill dot entry info */
 316                         if (i == 0) {
 317                                 d_info->name = ".";
 318                                 d_info->name_len = 1;
 319                                 dentry = dir->filp->f_path.dentry;
 320                         } else {
 321                                 d_info->name = "..";
 322                                 d_info->name_len = 2;
 323                                 dentry = dir->filp->f_path.dentry->d_parent;
 324                         }
 325
 326                         if (!match_pattern(d_info->name, d_info->name_len,
 327                                            search_pattern)) {
 328                                 dir->dot_dotdot[i] = 1;
 329                                 continue;
 330                         }
 331
 332                         ksmbd_kstat.kstat = &kstat;
 333                         ksmbd_vfs_fill_dentry_attrs(work,
 334                                                     user_ns,
 335                                                     dentry,
 336                                                     &ksmbd_kstat);
 337                         rc = fn(conn, info_level, d_info, &ksmbd_kstat);
 338                         if (rc)
 339                                 break;
 340                         if (d_info->out_buf_len <= 0)
 341                                 break;
 342
 343                         dir->dot_dotdot[i] = 1;
 344                         if (d_info->flags & SMB2_RETURN_SINGLE_ENTRY) {
 345                                 d_info->out_buf_len = 0;
 346                                 break;
 347                         }
 348                 }
 349         }
 350
 351         return rc;
 352 }
 353
 354 /**
 355  * ksmbd_extract_shortname() - get shortname from long filename
 356  * @conn:       connection instance
 357  * @longname:   source long filename
 358  * @shortname:  destination short filename
 359  *
 360  * Return:      shortname length or 0 when source long name is '.' or '..'
 361  * TODO: Though this function comforms the restriction of 8.3 Filename spec,
 362  * but the result is different with Windows 7's one. need to check.
 363  */
 364 int ksmbd_extract_shortname(struct ksmbd_conn *conn, const char *longname,
 365                             char *shortname)
 366 {
 367         const char *p;
 368         char base[9], extension[4];
 369         char out[13] = {0};
 370         int baselen = 0;
 371         int extlen = 0, len = 0;
 372         unsigned int csum = 0;
 373         const unsigned char *ptr;
 374         bool dot_present = true;
 375
 376         p = longname;
 377         if ((*p == '.') || (!(strcmp(p, "..")))) {
 378                 /*no mangling required */
 379                 return 0;
 380         }
 381
 382         p = strrchr(longname, '.');
 383         if (p == longname) { /*name starts with a dot*/
 384                 strscpy(extension, "___", strlen("___"));
 385         } else {
 386                 if (p) {
 387                         p++;
 388                         while (*p && extlen < 3) {
 389                                 if (*p != '.')
 390                                         extension[extlen++] = toupper(*p);
 391                                 p++;
 392                         }
 393                         extension[extlen] = '\0';
 394                 } else {
 395                         dot_present = false;
 396                 }
 397         }
 398
 399         p = longname;
 400         if (*p == '.') {
 401                 p++;
 402                 longname++;
 403         }
 404         while (*p && (baselen < 5)) {
 405                 if (*p != '.')
 406                         base[baselen++] = toupper(*p);
 407                 p++;
 408         }
 409
 410         base[baselen] = MAGIC_CHAR;
 411         memcpy(out, base, baselen + 1);
 412
 413         ptr = longname;
 414         len = strlen(longname);
 415         for (; len > 0; len--, ptr++)
 416                 csum += *ptr;
 417
 418         csum = csum % (MANGLE_BASE * MANGLE_BASE);
 419         out[baselen + 1] = mangle(csum / MANGLE_BASE);
 420         out[baselen + 2] = mangle(csum);
 421         out[baselen + 3] = PERIOD;
 422
 423         if (dot_present)
 424                 memcpy(&out[baselen + 4], extension, 4);
 425         else
 426                 out[baselen + 4] = '\0';
 427         smbConvertToUTF16((__le16 *)shortname, out, PATH_MAX,
 428                           conn->local_nls, 0);
 429         len = strlen(out) * 2;
 430         return len;
 431 }
 432
 433 static int __smb2_negotiate(struct ksmbd_conn *conn)
 434 {
 435         return (conn->dialect >= SMB21_PROT_ID &&
 436                 conn->dialect <= SMB311_PROT_ID);
 437 }
 438
 439 static int smb_handle_negotiate(struct ksmbd_work *work)
 440 {
 441         struct smb_negotiate_rsp *neg_rsp = work->response_buf;
 442
 443         ksmbd_debug(SMB, "Unsupported SMB protocol\n");
 444         neg_rsp->hdr.Status.CifsError = STATUS_INVALID_LOGON_TYPE;
 445         return -EINVAL;
 446 }
 447
 448 int ksmbd_smb_negotiate_common(struct ksmbd_work *work, unsigned int command)
 449 {
 450         struct ksmbd_conn *conn = work->conn;
 451         int ret;
 452
 453         conn->dialect =
 454                 ksmbd_negotiate_smb_dialect(work->request_buf);
 455         ksmbd_debug(SMB, "conn->dialect 0x%x\n", conn->dialect);
 456
 457         if (command == SMB2_NEGOTIATE_HE) {
 458                 struct smb2_hdr *smb2_hdr = smb2_get_msg(work->request_buf);
 459
 460                 if (smb2_hdr->ProtocolId != SMB2_PROTO_NUMBER) {
 461                         ksmbd_debug(SMB, "Downgrade to SMB1 negotiation\n");
 462                         command = SMB_COM_NEGOTIATE;
 463                 }
 464         }
 465
 466         if (command == SMB2_NEGOTIATE_HE && __smb2_negotiate(conn)) {
 467                 ret = smb2_handle_negotiate(work);
 468                 init_smb2_neg_rsp(work);
 469                 return ret;
 470         }
 471
 472         if (command == SMB_COM_NEGOTIATE) {
 473                 if (__smb2_negotiate(conn)) {
 474                         conn->need_neg = true;
 475                         init_smb3_11_server(conn);
 476                         init_smb2_neg_rsp(work);
 477                         ksmbd_debug(SMB, "Upgrade to SMB2 negotiation\n");
 478                         return 0;
 479                 }
 480                 return smb_handle_negotiate(work);
 481         }
 482
 483         pr_err("Unknown SMB negotiation command: %u\n", command);
 484         return -EINVAL;
 485 }
 486
 487 enum SHARED_MODE_ERRORS {
 488         SHARE_DELETE_ERROR,
 489         SHARE_READ_ERROR,
 490         SHARE_WRITE_ERROR,
 491         FILE_READ_ERROR,
 492         FILE_WRITE_ERROR,
 493         FILE_DELETE_ERROR,
 494 };
 495
 496 static const char * const shared_mode_errors[] = {
 497         "Current access mode does not permit SHARE_DELETE",
 498         "Current access mode does not permit SHARE_READ",
 499         "Current access mode does not permit SHARE_WRITE",
 500         "Desired access mode does not permit FILE_READ",
 501         "Desired access mode does not permit FILE_WRITE",
 502         "Desired access mode does not permit FILE_DELETE",
 503 };
 504
 505 static void smb_shared_mode_error(int error, struct ksmbd_file *prev_fp,
 506                                   struct ksmbd_file *curr_fp)
 507 {
 508         ksmbd_debug(SMB, "%s\n", shared_mode_errors[error]);
 509         ksmbd_debug(SMB, "Current mode: 0x%x Desired mode: 0x%x\n",
 510                     prev_fp->saccess, curr_fp->daccess);
 511 }
 512
 513 int ksmbd_smb_check_shared_mode(struct file *filp, struct ksmbd_file *curr_fp)
 514 {
 515         int rc = 0;
 516         struct ksmbd_file *prev_fp;
 517
 518         /*
 519          * Lookup fp in master fp list, and check desired access and
 520          * shared mode between previous open and current open.
 521          */
 522         read_lock(&curr_fp->f_ci->m_lock);
 523         list_for_each_entry(prev_fp, &curr_fp->f_ci->m_fp_list, node) {
 524                 if (file_inode(filp) != file_inode(prev_fp->filp))
 525                         continue;
 526
 527                 if (filp == prev_fp->filp)
 528                         continue;
 529
 530                 if (ksmbd_stream_fd(prev_fp) && ksmbd_stream_fd(curr_fp))
 531                         if (strcmp(prev_fp->stream.name, curr_fp->stream.name))
 532                                 continue;
 533
 534                 if (prev_fp->attrib_only != curr_fp->attrib_only)
 535                         continue;
 536
 537                 if (!(prev_fp->saccess & FILE_SHARE_DELETE_LE) &&
 538                     curr_fp->daccess & FILE_DELETE_LE) {
 539                         smb_shared_mode_error(SHARE_DELETE_ERROR,
 540                                               prev_fp,
 541                                               curr_fp);
 542                         rc = -EPERM;
 543                         break;
 544                 }
 545
 546                 /*
 547                  * Only check FILE_SHARE_DELETE if stream opened and
 548                  * normal file opened.
 549                  */
 550                 if (ksmbd_stream_fd(prev_fp) && !ksmbd_stream_fd(curr_fp))
 551                         continue;
 552
 553                 if (!(prev_fp->saccess & FILE_SHARE_READ_LE) &&
 554                     curr_fp->daccess & (FILE_EXECUTE_LE | FILE_READ_DATA_LE)) {
 555                         smb_shared_mode_error(SHARE_READ_ERROR,
 556                                               prev_fp,
 557                                               curr_fp);
 558                         rc = -EPERM;
 559                         break;
 560                 }
 561
 562                 if (!(prev_fp->saccess & FILE_SHARE_WRITE_LE) &&
 563                     curr_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE)) {
 564                         smb_shared_mode_error(SHARE_WRITE_ERROR,
 565                                               prev_fp,
 566                                               curr_fp);
 567                         rc = -EPERM;
 568                         break;
 569                 }
 570
 571                 if (prev_fp->daccess & (FILE_EXECUTE_LE | FILE_READ_DATA_LE) &&
 572                     !(curr_fp->saccess & FILE_SHARE_READ_LE)) {
 573                         smb_shared_mode_error(FILE_READ_ERROR,
 574                                               prev_fp,
 575                                               curr_fp);
 576                         rc = -EPERM;
 577                         break;
 578                 }
 579
 580                 if (prev_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE) &&
 581                     !(curr_fp->saccess & FILE_SHARE_WRITE_LE)) {
 582                         smb_shared_mode_error(FILE_WRITE_ERROR,
 583                                               prev_fp,
 584                                               curr_fp);
 585                         rc = -EPERM;
 586                         break;
 587                 }
 588
 589                 if (prev_fp->daccess & FILE_DELETE_LE &&
 590                     !(curr_fp->saccess & FILE_SHARE_DELETE_LE)) {
 591                         smb_shared_mode_error(FILE_DELETE_ERROR,
 592                                               prev_fp,
 593                                               curr_fp);
 594                         rc = -EPERM;
 595                         break;
 596                 }
 597         }
 598         read_unlock(&curr_fp->f_ci->m_lock);
 599
 600         return rc;
 601 }
 602
 603 bool is_asterisk(char *p)
 604 {
 605         return p && p[0] == '*';
 606 }
 607
 608 int ksmbd_override_fsids(struct ksmbd_work *work)
 609 {
 610         struct ksmbd_session *sess = work->sess;
 611         struct ksmbd_share_config *share = work->tcon->share_conf;
 612         struct cred *cred;
 613         struct group_info *gi;
 614         unsigned int uid;
 615         unsigned int gid;
 616
 617         uid = user_uid(sess->user);
 618         gid = user_gid(sess->user);
 619         if (share->force_uid != KSMBD_SHARE_INVALID_UID)
 620                 uid = share->force_uid;
 621         if (share->force_gid != KSMBD_SHARE_INVALID_GID)
 622                 gid = share->force_gid;
 623
 624         cred = prepare_kernel_cred(NULL);
 625         if (!cred)
 626                 return -ENOMEM;
 627
 628         cred->fsuid = make_kuid(current_user_ns(), uid);
 629         cred->fsgid = make_kgid(current_user_ns(), gid);
 630
 631         gi = groups_alloc(0);
 632         if (!gi) {
 633                 abort_creds(cred);
 634                 return -ENOMEM;
 635         }
 636         set_groups(cred, gi);
 637         put_group_info(gi);
 638
 639         if (!uid_eq(cred->fsuid, GLOBAL_ROOT_UID))
 640                 cred->cap_effective = cap_drop_fs_set(cred->cap_effective);
 641
 642         WARN_ON(work->saved_cred);
 643         work->saved_cred = override_creds(cred);
 644         if (!work->saved_cred) {
 645                 abort_creds(cred);
 646                 return -EINVAL;
 647         }
 648         return 0;
 649 }
 650
 651 void ksmbd_revert_fsids(struct ksmbd_work *work)
 652 {
 653         const struct cred *cred;
 654
 655         WARN_ON(!work->saved_cred);
 656
 657         cred = current_cred();
 658         revert_creds(work->saved_cred);
 659         put_cred(cred);
 660         work->saved_cred = NULL;
 661 }
 662
 663 __le32 smb_map_generic_desired_access(__le32 daccess)
 664 {
 665         if (daccess & FILE_GENERIC_READ_LE) {
 666                 daccess |= cpu_to_le32(GENERIC_READ_FLAGS);
 667                 daccess &= ~FILE_GENERIC_READ_LE;
 668         }
 669
 670         if (daccess & FILE_GENERIC_WRITE_LE) {
 671                 daccess |= cpu_to_le32(GENERIC_WRITE_FLAGS);
 672                 daccess &= ~FILE_GENERIC_WRITE_LE;
 673         }
 674
 675         if (daccess & FILE_GENERIC_EXECUTE_LE) {
 676                 daccess |= cpu_to_le32(GENERIC_EXECUTE_FLAGS);
 677                 daccess &= ~FILE_GENERIC_EXECUTE_LE;
 678         }
 679
 680         if (daccess & FILE_GENERIC_ALL_LE) {
 681                 daccess |= cpu_to_le32(GENERIC_ALL_FLAGS);
 682                 daccess &= ~FILE_GENERIC_ALL_LE;
 683         }
 684
 685         return daccess;
 686 }