1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org> 4 * Copyright (C) 2018 Samsung Electronics Co., Ltd. 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/fs.h> 9 #include <linux/filelock.h> 10 #include <linux/uaccess.h> 11 #include <linux/backing-dev.h> 12 #include <linux/writeback.h> 13 #include <linux/xattr.h> 14 #include <linux/falloc.h> 15 #include <linux/fsnotify.h> 16 #include <linux/dcache.h> 17 #include <linux/slab.h> 18 #include <linux/vmalloc.h> 19 #include <linux/sched/xacct.h> 20 #include <linux/crc32c.h> 21 #include <linux/namei.h> 22 23 #include "glob.h" 24 #include "oplock.h" 25 #include "connection.h" 26 #include "vfs.h" 27 #include "vfs_cache.h" 28 #include "smbacl.h" 29 #include "ndr.h" 30 #include "auth.h" 31 #include "misc.h" 32 33 #include "smb_common.h" 34 #include "mgmt/share_config.h" 35 #include "mgmt/tree_connect.h" 36 #include "mgmt/user_session.h" 37 #include "mgmt/user_config.h" 38 39 static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work, 40 struct inode *parent_inode, 41 struct inode *inode) 42 { 43 if (!test_share_config_flag(work->tcon->share_conf, 44 KSMBD_SHARE_FLAG_INHERIT_OWNER)) 45 return; 46 47 i_uid_write(inode, i_uid_read(parent_inode)); 48 } 49 50 /** 51 * ksmbd_vfs_lock_parent() - lock parent dentry if it is stable 52 * @parent: parent dentry 53 * @child: child dentry 54 * 55 * Returns: %0 on success, %-ENOENT if the parent dentry is not stable 56 */ 57 int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child) 58 { 59 inode_lock_nested(d_inode(parent), I_MUTEX_PARENT); 60 if (child->d_parent != parent) { 61 inode_unlock(d_inode(parent)); 62 return -ENOENT; 63 } 64 65 return 0; 66 } 67 68 static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf, 69 char *pathname, unsigned int flags, 70 struct path *parent_path, 71 struct path *path) 72 { 73 struct qstr last; 74 struct filename *filename; 75 struct path *root_share_path = &share_conf->vfs_path; 76 int err, type; 77 struct dentry *d; 78 79 if (pathname[0] == '\0') { 80 pathname = share_conf->path; 81 root_share_path = NULL; 82 } else { 83 flags |= LOOKUP_BENEATH; 84 } 85 86 filename = getname_kernel(pathname); 87 if (IS_ERR(filename)) 88 return PTR_ERR(filename); 89 90 err = vfs_path_parent_lookup(filename, flags, 91 parent_path, &last, &type, 92 root_share_path); 93 if (err) { 94 putname(filename); 95 return err; 96 } 97 98 if (unlikely(type != LAST_NORM)) { 99 path_put(parent_path); 100 putname(filename); 101 return -ENOENT; 102 } 103 104 err = mnt_want_write(parent_path->mnt); 105 if (err) { 106 path_put(parent_path); 107 putname(filename); 108 return -ENOENT; 109 } 110 111 inode_lock_nested(parent_path->dentry->d_inode, I_MUTEX_PARENT); 112 d = lookup_one_qstr_excl(&last, parent_path->dentry, 0); 113 if (IS_ERR(d)) 114 goto err_out; 115 116 path->dentry = d; 117 path->mnt = mntget(parent_path->mnt); 118 119 if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) { 120 err = follow_down(path, 0); 121 if (err < 0) { 122 path_put(path); 123 goto err_out; 124 } 125 } 126 127 putname(filename); 128 return 0; 129 130 err_out: 131 inode_unlock(d_inode(parent_path->dentry)); 132 mnt_drop_write(parent_path->mnt); 133 path_put(parent_path); 134 putname(filename); 135 return -ENOENT; 136 } 137 138 void ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap, 139 struct dentry *dentry, __le32 *daccess) 140 { 141 *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL); 142 143 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE)) 144 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE | 145 FILE_WRITE_DATA | FILE_APPEND_DATA | 146 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES | 147 FILE_DELETE_CHILD); 148 149 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ)) 150 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE; 151 152 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC)) 153 *daccess |= FILE_EXECUTE_LE; 154 155 if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE)) 156 *daccess |= FILE_DELETE_LE; 157 } 158 159 /** 160 * ksmbd_vfs_create() - vfs helper for smb create file 161 * @work: work 162 * @name: file name that is relative to share 163 * @mode: file create mode 164 * 165 * Return: 0 on success, otherwise error 166 */ 167 int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode) 168 { 169 struct path path; 170 struct dentry *dentry; 171 int err; 172 173 dentry = ksmbd_vfs_kern_path_create(work, name, 174 LOOKUP_NO_SYMLINKS, &path); 175 if (IS_ERR(dentry)) { 176 err = PTR_ERR(dentry); 177 if (err != -ENOENT) 178 pr_err("path create failed for %s, err %d\n", 179 name, err); 180 return err; 181 } 182 183 mode |= S_IFREG; 184 err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry), 185 dentry, mode, true); 186 if (!err) { 187 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), 188 d_inode(dentry)); 189 } else { 190 pr_err("File(%s): creation failed (err:%d)\n", name, err); 191 } 192 193 done_path_create(&path, dentry); 194 return err; 195 } 196 197 /** 198 * ksmbd_vfs_mkdir() - vfs helper for smb create directory 199 * @work: work 200 * @name: directory name that is relative to share 201 * @mode: directory create mode 202 * 203 * Return: 0 on success, otherwise error 204 */ 205 int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode) 206 { 207 struct mnt_idmap *idmap; 208 struct path path; 209 struct dentry *dentry, *d; 210 int err = 0; 211 212 dentry = ksmbd_vfs_kern_path_create(work, name, 213 LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY, 214 &path); 215 if (IS_ERR(dentry)) { 216 err = PTR_ERR(dentry); 217 if (err != -EEXIST) 218 ksmbd_debug(VFS, "path create failed for %s, err %d\n", 219 name, err); 220 return err; 221 } 222 223 idmap = mnt_idmap(path.mnt); 224 mode |= S_IFDIR; 225 d = dentry; 226 dentry = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode); 227 if (IS_ERR(dentry)) 228 err = PTR_ERR(dentry); 229 else if (d_is_negative(dentry)) 230 err = -ENOENT; 231 if (!err && dentry != d) 232 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(dentry)); 233 234 done_path_create(&path, dentry); 235 if (err) 236 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err); 237 return err; 238 } 239 240 static ssize_t ksmbd_vfs_getcasexattr(struct mnt_idmap *idmap, 241 struct dentry *dentry, char *attr_name, 242 int attr_name_len, char **attr_value) 243 { 244 char *name, *xattr_list = NULL; 245 ssize_t value_len = -ENOENT, xattr_list_len; 246 247 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list); 248 if (xattr_list_len <= 0) 249 goto out; 250 251 for (name = xattr_list; name - xattr_list < xattr_list_len; 252 name += strlen(name) + 1) { 253 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name)); 254 if (strncasecmp(attr_name, name, attr_name_len)) 255 continue; 256 257 value_len = ksmbd_vfs_getxattr(idmap, 258 dentry, 259 name, 260 attr_value); 261 if (value_len < 0) 262 pr_err("failed to get xattr in file\n"); 263 break; 264 } 265 266 out: 267 kvfree(xattr_list); 268 return value_len; 269 } 270 271 static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos, 272 size_t count) 273 { 274 ssize_t v_len; 275 char *stream_buf = NULL; 276 277 ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n", 278 *pos, count); 279 280 v_len = ksmbd_vfs_getcasexattr(file_mnt_idmap(fp->filp), 281 fp->filp->f_path.dentry, 282 fp->stream.name, 283 fp->stream.size, 284 &stream_buf); 285 if ((int)v_len <= 0) 286 return (int)v_len; 287 288 if (v_len <= *pos) { 289 count = -EINVAL; 290 goto free_buf; 291 } 292 293 if (v_len - *pos < count) 294 count = v_len - *pos; 295 296 memcpy(buf, &stream_buf[*pos], count); 297 298 free_buf: 299 kvfree(stream_buf); 300 return count; 301 } 302 303 /** 304 * check_lock_range() - vfs helper for smb byte range file locking 305 * @filp: the file to apply the lock to 306 * @start: lock start byte offset 307 * @end: lock end byte offset 308 * @type: byte range type read/write 309 * 310 * Return: 0 on success, otherwise error 311 */ 312 static int check_lock_range(struct file *filp, loff_t start, loff_t end, 313 unsigned char type) 314 { 315 struct file_lock *flock; 316 struct file_lock_context *ctx = locks_inode_context(file_inode(filp)); 317 int error = 0; 318 319 if (!ctx || list_empty_careful(&ctx->flc_posix)) 320 return 0; 321 322 spin_lock(&ctx->flc_lock); 323 for_each_file_lock(flock, &ctx->flc_posix) { 324 /* check conflict locks */ 325 if (flock->fl_end >= start && end >= flock->fl_start) { 326 if (lock_is_read(flock)) { 327 if (type == WRITE) { 328 pr_err("not allow write by shared lock\n"); 329 error = 1; 330 goto out; 331 } 332 } else if (lock_is_write(flock)) { 333 /* check owner in lock */ 334 if (flock->c.flc_file != filp) { 335 error = 1; 336 pr_err("not allow rw access by exclusive lock from other opens\n"); 337 goto out; 338 } 339 } 340 } 341 } 342 out: 343 spin_unlock(&ctx->flc_lock); 344 return error; 345 } 346 347 /** 348 * ksmbd_vfs_read() - vfs helper for smb file read 349 * @work: smb work 350 * @fp: ksmbd file pointer 351 * @count: read byte count 352 * @pos: file pos 353 * @rbuf: read data buffer 354 * 355 * Return: number of read bytes on success, otherwise error 356 */ 357 int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count, 358 loff_t *pos, char *rbuf) 359 { 360 struct file *filp = fp->filp; 361 ssize_t nbytes = 0; 362 struct inode *inode = file_inode(filp); 363 364 if (S_ISDIR(inode->i_mode)) 365 return -EISDIR; 366 367 if (unlikely(count == 0)) 368 return 0; 369 370 if (work->conn->connection_type) { 371 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) { 372 pr_err("no right to read(%pD)\n", fp->filp); 373 return -EACCES; 374 } 375 } 376 377 if (ksmbd_stream_fd(fp)) 378 return ksmbd_vfs_stream_read(fp, rbuf, pos, count); 379 380 if (!work->tcon->posix_extensions) { 381 int ret; 382 383 ret = check_lock_range(filp, *pos, *pos + count - 1, READ); 384 if (ret) { 385 pr_err("unable to read due to lock\n"); 386 return -EAGAIN; 387 } 388 } 389 390 nbytes = kernel_read(filp, rbuf, count, pos); 391 if (nbytes < 0) { 392 pr_err("smb read failed, err = %zd\n", nbytes); 393 return nbytes; 394 } 395 396 filp->f_pos = *pos; 397 return nbytes; 398 } 399 400 static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos, 401 size_t count) 402 { 403 char *stream_buf = NULL, *wbuf; 404 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp); 405 size_t size; 406 ssize_t v_len; 407 int err = 0; 408 409 ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n", 410 *pos, count); 411 412 if (*pos >= XATTR_SIZE_MAX) { 413 pr_err("stream write position %lld is out of bounds\n", *pos); 414 return -EINVAL; 415 } 416 417 size = *pos + count; 418 if (size > XATTR_SIZE_MAX) { 419 size = XATTR_SIZE_MAX; 420 count = XATTR_SIZE_MAX - *pos; 421 } 422 423 v_len = ksmbd_vfs_getcasexattr(idmap, 424 fp->filp->f_path.dentry, 425 fp->stream.name, 426 fp->stream.size, 427 &stream_buf); 428 if (v_len < 0) { 429 pr_err("not found stream in xattr : %zd\n", v_len); 430 err = v_len; 431 goto out; 432 } 433 434 if (v_len < size) { 435 wbuf = kvzalloc(size, KSMBD_DEFAULT_GFP); 436 if (!wbuf) { 437 err = -ENOMEM; 438 goto out; 439 } 440 441 if (v_len > 0) 442 memcpy(wbuf, stream_buf, v_len); 443 kvfree(stream_buf); 444 stream_buf = wbuf; 445 } 446 447 memcpy(&stream_buf[*pos], buf, count); 448 449 err = ksmbd_vfs_setxattr(idmap, 450 &fp->filp->f_path, 451 fp->stream.name, 452 (void *)stream_buf, 453 size, 454 0, 455 true); 456 if (err < 0) 457 goto out; 458 459 fp->filp->f_pos = *pos; 460 err = 0; 461 out: 462 kvfree(stream_buf); 463 return err; 464 } 465 466 /** 467 * ksmbd_vfs_write() - vfs helper for smb file write 468 * @work: work 469 * @fp: ksmbd file pointer 470 * @buf: buf containing data for writing 471 * @count: read byte count 472 * @pos: file pos 473 * @sync: fsync after write 474 * @written: number of bytes written 475 * 476 * Return: 0 on success, otherwise error 477 */ 478 int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp, 479 char *buf, size_t count, loff_t *pos, bool sync, 480 ssize_t *written) 481 { 482 struct file *filp; 483 loff_t offset = *pos; 484 int err = 0; 485 486 if (work->conn->connection_type) { 487 if (!(fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE)) || 488 S_ISDIR(file_inode(fp->filp)->i_mode)) { 489 pr_err("no right to write(%pD)\n", fp->filp); 490 err = -EACCES; 491 goto out; 492 } 493 } 494 495 filp = fp->filp; 496 497 if (ksmbd_stream_fd(fp)) { 498 err = ksmbd_vfs_stream_write(fp, buf, pos, count); 499 if (!err) 500 *written = count; 501 goto out; 502 } 503 504 if (!work->tcon->posix_extensions) { 505 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE); 506 if (err) { 507 pr_err("unable to write due to lock\n"); 508 err = -EAGAIN; 509 goto out; 510 } 511 } 512 513 /* Reserve lease break for parent dir at closing time */ 514 fp->reserve_lease_break = true; 515 516 /* Do we need to break any of a levelII oplock? */ 517 smb_break_all_levII_oplock(work, fp, 1); 518 519 err = kernel_write(filp, buf, count, pos); 520 if (err < 0) { 521 ksmbd_debug(VFS, "smb write failed, err = %d\n", err); 522 goto out; 523 } 524 525 filp->f_pos = *pos; 526 *written = err; 527 err = 0; 528 if (sync) { 529 err = vfs_fsync_range(filp, offset, offset + *written, 0); 530 if (err < 0) 531 pr_err("fsync failed for filename = %pD, err = %d\n", 532 fp->filp, err); 533 } 534 535 out: 536 return err; 537 } 538 539 /** 540 * ksmbd_vfs_getattr() - vfs helper for smb getattr 541 * @path: path of dentry 542 * @stat: pointer to returned kernel stat structure 543 * Return: 0 on success, otherwise error 544 */ 545 int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat) 546 { 547 int err; 548 549 err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT); 550 if (err) 551 pr_err("getattr failed, err %d\n", err); 552 return err; 553 } 554 555 /** 556 * ksmbd_vfs_fsync() - vfs helper for smb fsync 557 * @work: work 558 * @fid: file id of open file 559 * @p_id: persistent file id 560 * 561 * Return: 0 on success, otherwise error 562 */ 563 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id) 564 { 565 struct ksmbd_file *fp; 566 int err; 567 568 fp = ksmbd_lookup_fd_slow(work, fid, p_id); 569 if (!fp) { 570 pr_err("failed to get filp for fid %llu\n", fid); 571 return -ENOENT; 572 } 573 err = vfs_fsync(fp->filp, 0); 574 if (err < 0) 575 pr_err("smb fsync failed, err = %d\n", err); 576 ksmbd_fd_put(work, fp); 577 return err; 578 } 579 580 /** 581 * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink 582 * @work: work 583 * @path: path of dentry 584 * 585 * Return: 0 on success, otherwise error 586 */ 587 int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path) 588 { 589 struct mnt_idmap *idmap; 590 struct dentry *parent = path->dentry->d_parent; 591 int err; 592 593 if (ksmbd_override_fsids(work)) 594 return -ENOMEM; 595 596 if (!d_inode(path->dentry)->i_nlink) { 597 err = -ENOENT; 598 goto out_err; 599 } 600 601 idmap = mnt_idmap(path->mnt); 602 if (S_ISDIR(d_inode(path->dentry)->i_mode)) { 603 err = vfs_rmdir(idmap, d_inode(parent), path->dentry); 604 if (err && err != -ENOTEMPTY) 605 ksmbd_debug(VFS, "rmdir failed, err %d\n", err); 606 } else { 607 err = vfs_unlink(idmap, d_inode(parent), path->dentry, NULL); 608 if (err) 609 ksmbd_debug(VFS, "unlink failed, err %d\n", err); 610 } 611 612 out_err: 613 ksmbd_revert_fsids(work); 614 return err; 615 } 616 617 /** 618 * ksmbd_vfs_link() - vfs helper for creating smb hardlink 619 * @work: work 620 * @oldname: source file name 621 * @newname: hardlink name that is relative to share 622 * 623 * Return: 0 on success, otherwise error 624 */ 625 int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname, 626 const char *newname) 627 { 628 struct path oldpath, newpath; 629 struct dentry *dentry; 630 int err; 631 632 if (ksmbd_override_fsids(work)) 633 return -ENOMEM; 634 635 err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath); 636 if (err) { 637 pr_err("cannot get linux path for %s, err = %d\n", 638 oldname, err); 639 goto out1; 640 } 641 642 dentry = ksmbd_vfs_kern_path_create(work, newname, 643 LOOKUP_NO_SYMLINKS | LOOKUP_REVAL, 644 &newpath); 645 if (IS_ERR(dentry)) { 646 err = PTR_ERR(dentry); 647 pr_err("path create err for %s, err %d\n", newname, err); 648 goto out2; 649 } 650 651 err = -EXDEV; 652 if (oldpath.mnt != newpath.mnt) { 653 pr_err("vfs_link failed err %d\n", err); 654 goto out3; 655 } 656 657 err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt), 658 d_inode(newpath.dentry), 659 dentry, NULL); 660 if (err) 661 ksmbd_debug(VFS, "vfs_link failed err %d\n", err); 662 663 out3: 664 done_path_create(&newpath, dentry); 665 out2: 666 path_put(&oldpath); 667 out1: 668 ksmbd_revert_fsids(work); 669 return err; 670 } 671 672 int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path, 673 char *newname, int flags) 674 { 675 struct dentry *old_parent, *new_dentry, *trap; 676 struct dentry *old_child = old_path->dentry; 677 struct path new_path; 678 struct qstr new_last; 679 struct renamedata rd; 680 struct filename *to; 681 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 682 struct ksmbd_file *parent_fp; 683 int new_type; 684 int err, lookup_flags = LOOKUP_NO_SYMLINKS; 685 int target_lookup_flags = LOOKUP_RENAME_TARGET | LOOKUP_CREATE; 686 687 if (ksmbd_override_fsids(work)) 688 return -ENOMEM; 689 690 to = getname_kernel(newname); 691 if (IS_ERR(to)) { 692 err = PTR_ERR(to); 693 goto revert_fsids; 694 } 695 696 /* 697 * explicitly handle file overwrite case, for compatibility with 698 * filesystems that may not support rename flags (e.g: fuse) 699 */ 700 if (flags & RENAME_NOREPLACE) 701 target_lookup_flags |= LOOKUP_EXCL; 702 flags &= ~(RENAME_NOREPLACE); 703 704 retry: 705 err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH, 706 &new_path, &new_last, &new_type, 707 &share_conf->vfs_path); 708 if (err) 709 goto out1; 710 711 if (old_path->mnt != new_path.mnt) { 712 err = -EXDEV; 713 goto out2; 714 } 715 716 err = mnt_want_write(old_path->mnt); 717 if (err) 718 goto out2; 719 720 trap = lock_rename_child(old_child, new_path.dentry); 721 if (IS_ERR(trap)) { 722 err = PTR_ERR(trap); 723 goto out_drop_write; 724 } 725 726 old_parent = dget(old_child->d_parent); 727 if (d_unhashed(old_child)) { 728 err = -EINVAL; 729 goto out3; 730 } 731 732 parent_fp = ksmbd_lookup_fd_inode(old_child->d_parent); 733 if (parent_fp) { 734 if (parent_fp->daccess & FILE_DELETE_LE) { 735 pr_err("parent dir is opened with delete access\n"); 736 err = -ESHARE; 737 ksmbd_fd_put(work, parent_fp); 738 goto out3; 739 } 740 ksmbd_fd_put(work, parent_fp); 741 } 742 743 new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry, 744 lookup_flags | target_lookup_flags); 745 if (IS_ERR(new_dentry)) { 746 err = PTR_ERR(new_dentry); 747 goto out3; 748 } 749 750 if (d_is_symlink(new_dentry)) { 751 err = -EACCES; 752 goto out4; 753 } 754 755 if (old_child == trap) { 756 err = -EINVAL; 757 goto out4; 758 } 759 760 if (new_dentry == trap) { 761 err = -ENOTEMPTY; 762 goto out4; 763 } 764 765 rd.old_mnt_idmap = mnt_idmap(old_path->mnt), 766 rd.old_dir = d_inode(old_parent), 767 rd.old_dentry = old_child, 768 rd.new_mnt_idmap = mnt_idmap(new_path.mnt), 769 rd.new_dir = new_path.dentry->d_inode, 770 rd.new_dentry = new_dentry, 771 rd.flags = flags, 772 rd.delegated_inode = NULL, 773 err = vfs_rename(&rd); 774 if (err) 775 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err); 776 777 out4: 778 dput(new_dentry); 779 out3: 780 dput(old_parent); 781 unlock_rename(old_parent, new_path.dentry); 782 out_drop_write: 783 mnt_drop_write(old_path->mnt); 784 out2: 785 path_put(&new_path); 786 787 if (retry_estale(err, lookup_flags)) { 788 lookup_flags |= LOOKUP_REVAL; 789 goto retry; 790 } 791 out1: 792 putname(to); 793 revert_fsids: 794 ksmbd_revert_fsids(work); 795 return err; 796 } 797 798 /** 799 * ksmbd_vfs_truncate() - vfs helper for smb file truncate 800 * @work: work 801 * @fp: ksmbd file pointer 802 * @size: truncate to given size 803 * 804 * Return: 0 on success, otherwise error 805 */ 806 int ksmbd_vfs_truncate(struct ksmbd_work *work, 807 struct ksmbd_file *fp, loff_t size) 808 { 809 int err = 0; 810 struct file *filp; 811 812 filp = fp->filp; 813 814 /* Do we need to break any of a levelII oplock? */ 815 smb_break_all_levII_oplock(work, fp, 1); 816 817 if (!work->tcon->posix_extensions) { 818 struct inode *inode = file_inode(filp); 819 820 if (size < inode->i_size) { 821 err = check_lock_range(filp, size, 822 inode->i_size - 1, WRITE); 823 } else { 824 err = check_lock_range(filp, inode->i_size, 825 size - 1, WRITE); 826 } 827 828 if (err) { 829 pr_err("failed due to lock\n"); 830 return -EAGAIN; 831 } 832 } 833 834 err = vfs_truncate(&filp->f_path, size); 835 if (err) 836 pr_err("truncate failed, err %d\n", err); 837 return err; 838 } 839 840 /** 841 * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes 842 * @dentry: dentry of file for listing xattrs 843 * @list: destination buffer 844 * 845 * Return: xattr list length on success, otherwise error 846 */ 847 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list) 848 { 849 ssize_t size; 850 char *vlist = NULL; 851 852 size = vfs_listxattr(dentry, NULL, 0); 853 if (size <= 0) 854 return size; 855 856 vlist = kvzalloc(size, KSMBD_DEFAULT_GFP); 857 if (!vlist) 858 return -ENOMEM; 859 860 *list = vlist; 861 size = vfs_listxattr(dentry, vlist, size); 862 if (size < 0) { 863 ksmbd_debug(VFS, "listxattr failed\n"); 864 kvfree(vlist); 865 *list = NULL; 866 } 867 868 return size; 869 } 870 871 static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap, 872 struct dentry *dentry, char *xattr_name) 873 { 874 return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0); 875 } 876 877 /** 878 * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value 879 * @idmap: idmap 880 * @dentry: dentry of file for getting xattrs 881 * @xattr_name: name of xattr name to query 882 * @xattr_buf: destination buffer xattr value 883 * 884 * Return: read xattr value length on success, otherwise error 885 */ 886 ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap, 887 struct dentry *dentry, 888 char *xattr_name, char **xattr_buf) 889 { 890 ssize_t xattr_len; 891 char *buf; 892 893 *xattr_buf = NULL; 894 xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name); 895 if (xattr_len < 0) 896 return xattr_len; 897 898 buf = kmalloc(xattr_len + 1, KSMBD_DEFAULT_GFP); 899 if (!buf) 900 return -ENOMEM; 901 902 xattr_len = vfs_getxattr(idmap, dentry, xattr_name, 903 (void *)buf, xattr_len); 904 if (xattr_len > 0) 905 *xattr_buf = buf; 906 else 907 kfree(buf); 908 return xattr_len; 909 } 910 911 /** 912 * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value 913 * @idmap: idmap of the relevant mount 914 * @path: path of dentry to set XATTR at 915 * @attr_name: xattr name for setxattr 916 * @attr_value: xattr value to set 917 * @attr_size: size of xattr value 918 * @flags: destination buffer length 919 * @get_write: get write access to a mount 920 * 921 * Return: 0 on success, otherwise error 922 */ 923 int ksmbd_vfs_setxattr(struct mnt_idmap *idmap, 924 const struct path *path, const char *attr_name, 925 void *attr_value, size_t attr_size, int flags, 926 bool get_write) 927 { 928 int err; 929 930 if (get_write == true) { 931 err = mnt_want_write(path->mnt); 932 if (err) 933 return err; 934 } 935 936 err = vfs_setxattr(idmap, 937 path->dentry, 938 attr_name, 939 attr_value, 940 attr_size, 941 flags); 942 if (err) 943 ksmbd_debug(VFS, "setxattr failed, err %d\n", err); 944 if (get_write == true) 945 mnt_drop_write(path->mnt); 946 return err; 947 } 948 949 /** 950 * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options 951 * @filp: file pointer for IO 952 * @option: smb IO options 953 */ 954 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option) 955 { 956 struct address_space *mapping; 957 958 mapping = filp->f_mapping; 959 960 if (!option || !mapping) 961 return; 962 963 if (option & FILE_WRITE_THROUGH_LE) { 964 filp->f_flags |= O_SYNC; 965 } else if (option & FILE_SEQUENTIAL_ONLY_LE) { 966 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2; 967 spin_lock(&filp->f_lock); 968 filp->f_mode &= ~FMODE_RANDOM; 969 spin_unlock(&filp->f_lock); 970 } else if (option & FILE_RANDOM_ACCESS_LE) { 971 spin_lock(&filp->f_lock); 972 filp->f_mode |= FMODE_RANDOM; 973 spin_unlock(&filp->f_lock); 974 } 975 } 976 977 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp, 978 loff_t off, loff_t len) 979 { 980 smb_break_all_levII_oplock(work, fp, 1); 981 if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE) 982 return vfs_fallocate(fp->filp, 983 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 984 off, len); 985 986 return vfs_fallocate(fp->filp, 987 FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE, 988 off, len); 989 } 990 991 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length, 992 struct file_allocated_range_buffer *ranges, 993 unsigned int in_count, unsigned int *out_count) 994 { 995 struct file *f = fp->filp; 996 struct inode *inode = file_inode(fp->filp); 997 loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end; 998 loff_t extent_start, extent_end; 999 int ret = 0; 1000 1001 if (start > maxbytes) 1002 return -EFBIG; 1003 1004 if (!in_count) 1005 return 0; 1006 1007 /* 1008 * Shrink request scope to what the fs can actually handle. 1009 */ 1010 if (length > maxbytes || (maxbytes - length) < start) 1011 length = maxbytes - start; 1012 1013 if (start + length > inode->i_size) 1014 length = inode->i_size - start; 1015 1016 *out_count = 0; 1017 end = start + length; 1018 while (start < end && *out_count < in_count) { 1019 extent_start = vfs_llseek(f, start, SEEK_DATA); 1020 if (extent_start < 0) { 1021 if (extent_start != -ENXIO) 1022 ret = (int)extent_start; 1023 break; 1024 } 1025 1026 if (extent_start >= end) 1027 break; 1028 1029 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE); 1030 if (extent_end < 0) { 1031 if (extent_end != -ENXIO) 1032 ret = (int)extent_end; 1033 break; 1034 } else if (extent_start >= extent_end) { 1035 break; 1036 } 1037 1038 ranges[*out_count].file_offset = cpu_to_le64(extent_start); 1039 ranges[(*out_count)++].length = 1040 cpu_to_le64(min(extent_end, end) - extent_start); 1041 1042 start = extent_end; 1043 } 1044 1045 return ret; 1046 } 1047 1048 int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap, 1049 const struct path *path, char *attr_name, 1050 bool get_write) 1051 { 1052 int err; 1053 1054 if (get_write == true) { 1055 err = mnt_want_write(path->mnt); 1056 if (err) 1057 return err; 1058 } 1059 1060 err = vfs_removexattr(idmap, path->dentry, attr_name); 1061 1062 if (get_write == true) 1063 mnt_drop_write(path->mnt); 1064 1065 return err; 1066 } 1067 1068 int ksmbd_vfs_unlink(struct file *filp) 1069 { 1070 int err = 0; 1071 struct dentry *dir, *dentry = filp->f_path.dentry; 1072 struct mnt_idmap *idmap = file_mnt_idmap(filp); 1073 1074 err = mnt_want_write(filp->f_path.mnt); 1075 if (err) 1076 return err; 1077 1078 dir = dget_parent(dentry); 1079 err = ksmbd_vfs_lock_parent(dir, dentry); 1080 if (err) 1081 goto out; 1082 dget(dentry); 1083 1084 if (S_ISDIR(d_inode(dentry)->i_mode)) 1085 err = vfs_rmdir(idmap, d_inode(dir), dentry); 1086 else 1087 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL); 1088 1089 dput(dentry); 1090 inode_unlock(d_inode(dir)); 1091 if (err) 1092 ksmbd_debug(VFS, "failed to delete, err %d\n", err); 1093 out: 1094 dput(dir); 1095 mnt_drop_write(filp->f_path.mnt); 1096 1097 return err; 1098 } 1099 1100 static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen, 1101 loff_t offset, u64 ino, unsigned int d_type) 1102 { 1103 struct ksmbd_readdir_data *buf; 1104 1105 buf = container_of(ctx, struct ksmbd_readdir_data, ctx); 1106 if (!is_dot_dotdot(name, namlen)) 1107 buf->dirent_count++; 1108 1109 return !buf->dirent_count; 1110 } 1111 1112 /** 1113 * ksmbd_vfs_empty_dir() - check for empty directory 1114 * @fp: ksmbd file pointer 1115 * 1116 * Return: true if directory empty, otherwise false 1117 */ 1118 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp) 1119 { 1120 int err; 1121 struct ksmbd_readdir_data readdir_data; 1122 1123 memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data)); 1124 1125 set_ctx_actor(&readdir_data.ctx, __dir_empty); 1126 readdir_data.dirent_count = 0; 1127 1128 err = iterate_dir(fp->filp, &readdir_data.ctx); 1129 if (readdir_data.dirent_count) 1130 err = -ENOTEMPTY; 1131 else 1132 err = 0; 1133 return err; 1134 } 1135 1136 static bool __caseless_lookup(struct dir_context *ctx, const char *name, 1137 int namlen, loff_t offset, u64 ino, 1138 unsigned int d_type) 1139 { 1140 struct ksmbd_readdir_data *buf; 1141 int cmp = -EINVAL; 1142 1143 buf = container_of(ctx, struct ksmbd_readdir_data, ctx); 1144 1145 if (buf->used != namlen) 1146 return true; 1147 if (IS_ENABLED(CONFIG_UNICODE) && buf->um) { 1148 const struct qstr q_buf = {.name = buf->private, 1149 .len = buf->used}; 1150 const struct qstr q_name = {.name = name, 1151 .len = namlen}; 1152 1153 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name); 1154 } 1155 if (cmp < 0) 1156 cmp = strncasecmp((char *)buf->private, name, namlen); 1157 if (!cmp) { 1158 memcpy((char *)buf->private, name, buf->used); 1159 buf->dirent_count = 1; 1160 return false; 1161 } 1162 return true; 1163 } 1164 1165 /** 1166 * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory 1167 * @dir: path info 1168 * @name: filename to lookup 1169 * @namelen: filename length 1170 * @um: &struct unicode_map to use 1171 * 1172 * Return: 0 on success, otherwise error 1173 */ 1174 static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name, 1175 size_t namelen, struct unicode_map *um) 1176 { 1177 int ret; 1178 struct file *dfilp; 1179 int flags = O_RDONLY | O_LARGEFILE; 1180 struct ksmbd_readdir_data readdir_data = { 1181 .ctx.actor = __caseless_lookup, 1182 .private = name, 1183 .used = namelen, 1184 .dirent_count = 0, 1185 .um = um, 1186 }; 1187 1188 dfilp = dentry_open(dir, flags, current_cred()); 1189 if (IS_ERR(dfilp)) 1190 return PTR_ERR(dfilp); 1191 1192 ret = iterate_dir(dfilp, &readdir_data.ctx); 1193 if (readdir_data.dirent_count > 0) 1194 ret = 0; 1195 fput(dfilp); 1196 return ret; 1197 } 1198 1199 /** 1200 * ksmbd_vfs_kern_path_locked() - lookup a file and get path info 1201 * @work: work 1202 * @name: file path that is relative to share 1203 * @flags: lookup flags 1204 * @parent_path: if lookup succeed, return parent_path info 1205 * @path: if lookup succeed, return path info 1206 * @caseless: caseless filename lookup 1207 * 1208 * Return: 0 on success, otherwise error 1209 */ 1210 int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name, 1211 unsigned int flags, struct path *parent_path, 1212 struct path *path, bool caseless) 1213 { 1214 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 1215 int err; 1216 1217 err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path, 1218 path); 1219 if (!err) 1220 return 0; 1221 1222 if (caseless) { 1223 char *filepath; 1224 size_t path_len, remain_len; 1225 1226 filepath = name; 1227 path_len = strlen(filepath); 1228 remain_len = path_len; 1229 1230 *parent_path = share_conf->vfs_path; 1231 path_get(parent_path); 1232 1233 while (d_can_lookup(parent_path->dentry)) { 1234 char *filename = filepath + path_len - remain_len; 1235 char *next = strchrnul(filename, '/'); 1236 size_t filename_len = next - filename; 1237 bool is_last = !next[0]; 1238 1239 if (filename_len == 0) 1240 break; 1241 1242 err = ksmbd_vfs_lookup_in_dir(parent_path, filename, 1243 filename_len, 1244 work->conn->um); 1245 if (err) 1246 goto out2; 1247 1248 next[0] = '\0'; 1249 1250 err = vfs_path_lookup(share_conf->vfs_path.dentry, 1251 share_conf->vfs_path.mnt, 1252 filepath, 1253 flags, 1254 path); 1255 if (!is_last) 1256 next[0] = '/'; 1257 if (err) 1258 goto out2; 1259 else if (is_last) 1260 goto out1; 1261 path_put(parent_path); 1262 *parent_path = *path; 1263 1264 remain_len -= filename_len + 1; 1265 } 1266 1267 err = -EINVAL; 1268 out2: 1269 path_put(parent_path); 1270 } 1271 1272 out1: 1273 if (!err) { 1274 err = mnt_want_write(parent_path->mnt); 1275 if (err) { 1276 path_put(path); 1277 path_put(parent_path); 1278 return err; 1279 } 1280 1281 err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry); 1282 if (err) { 1283 path_put(path); 1284 path_put(parent_path); 1285 } 1286 } 1287 return err; 1288 } 1289 1290 void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path) 1291 { 1292 inode_unlock(d_inode(parent_path->dentry)); 1293 mnt_drop_write(parent_path->mnt); 1294 path_put(path); 1295 path_put(parent_path); 1296 } 1297 1298 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work, 1299 const char *name, 1300 unsigned int flags, 1301 struct path *path) 1302 { 1303 char *abs_name; 1304 struct dentry *dent; 1305 1306 abs_name = convert_to_unix_name(work->tcon->share_conf, name); 1307 if (!abs_name) 1308 return ERR_PTR(-ENOMEM); 1309 1310 dent = kern_path_create(AT_FDCWD, abs_name, path, flags); 1311 kfree(abs_name); 1312 return dent; 1313 } 1314 1315 int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap, 1316 const struct path *path) 1317 { 1318 char *name, *xattr_list = NULL; 1319 ssize_t xattr_list_len; 1320 int err = 0; 1321 1322 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list); 1323 if (xattr_list_len < 0) { 1324 goto out; 1325 } else if (!xattr_list_len) { 1326 ksmbd_debug(SMB, "empty xattr in the file\n"); 1327 goto out; 1328 } 1329 1330 err = mnt_want_write(path->mnt); 1331 if (err) 1332 goto out; 1333 1334 for (name = xattr_list; name - xattr_list < xattr_list_len; 1335 name += strlen(name) + 1) { 1336 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name)); 1337 1338 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS, 1339 sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) || 1340 !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT, 1341 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) { 1342 err = vfs_remove_acl(idmap, path->dentry, name); 1343 if (err) 1344 ksmbd_debug(SMB, 1345 "remove acl xattr failed : %s\n", name); 1346 } 1347 } 1348 mnt_drop_write(path->mnt); 1349 1350 out: 1351 kvfree(xattr_list); 1352 return err; 1353 } 1354 1355 int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path) 1356 { 1357 char *name, *xattr_list = NULL; 1358 ssize_t xattr_list_len; 1359 int err = 0; 1360 1361 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list); 1362 if (xattr_list_len < 0) { 1363 goto out; 1364 } else if (!xattr_list_len) { 1365 ksmbd_debug(SMB, "empty xattr in the file\n"); 1366 goto out; 1367 } 1368 1369 for (name = xattr_list; name - xattr_list < xattr_list_len; 1370 name += strlen(name) + 1) { 1371 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name)); 1372 1373 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) { 1374 err = ksmbd_vfs_remove_xattr(idmap, path, name, true); 1375 if (err) 1376 ksmbd_debug(SMB, "remove xattr failed : %s\n", name); 1377 } 1378 } 1379 out: 1380 kvfree(xattr_list); 1381 return err; 1382 } 1383 1384 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap, 1385 struct inode *inode, 1386 int acl_type) 1387 { 1388 struct xattr_smb_acl *smb_acl = NULL; 1389 struct posix_acl *posix_acls; 1390 struct posix_acl_entry *pa_entry; 1391 struct xattr_acl_entry *xa_entry; 1392 int i; 1393 1394 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1395 return NULL; 1396 1397 posix_acls = get_inode_acl(inode, acl_type); 1398 if (IS_ERR_OR_NULL(posix_acls)) 1399 return NULL; 1400 1401 smb_acl = kzalloc(sizeof(struct xattr_smb_acl) + 1402 sizeof(struct xattr_acl_entry) * posix_acls->a_count, 1403 KSMBD_DEFAULT_GFP); 1404 if (!smb_acl) 1405 goto out; 1406 1407 smb_acl->count = posix_acls->a_count; 1408 pa_entry = posix_acls->a_entries; 1409 xa_entry = smb_acl->entries; 1410 for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) { 1411 switch (pa_entry->e_tag) { 1412 case ACL_USER: 1413 xa_entry->type = SMB_ACL_USER; 1414 xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry); 1415 break; 1416 case ACL_USER_OBJ: 1417 xa_entry->type = SMB_ACL_USER_OBJ; 1418 break; 1419 case ACL_GROUP: 1420 xa_entry->type = SMB_ACL_GROUP; 1421 xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry); 1422 break; 1423 case ACL_GROUP_OBJ: 1424 xa_entry->type = SMB_ACL_GROUP_OBJ; 1425 break; 1426 case ACL_OTHER: 1427 xa_entry->type = SMB_ACL_OTHER; 1428 break; 1429 case ACL_MASK: 1430 xa_entry->type = SMB_ACL_MASK; 1431 break; 1432 default: 1433 pr_err("unknown type : 0x%x\n", pa_entry->e_tag); 1434 goto out; 1435 } 1436 1437 if (pa_entry->e_perm & ACL_READ) 1438 xa_entry->perm |= SMB_ACL_READ; 1439 if (pa_entry->e_perm & ACL_WRITE) 1440 xa_entry->perm |= SMB_ACL_WRITE; 1441 if (pa_entry->e_perm & ACL_EXECUTE) 1442 xa_entry->perm |= SMB_ACL_EXECUTE; 1443 } 1444 out: 1445 posix_acl_release(posix_acls); 1446 return smb_acl; 1447 } 1448 1449 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn, 1450 struct mnt_idmap *idmap, 1451 const struct path *path, 1452 struct smb_ntsd *pntsd, int len, 1453 bool get_write) 1454 { 1455 int rc; 1456 struct ndr sd_ndr = {0}, acl_ndr = {0}; 1457 struct xattr_ntacl acl = {0}; 1458 struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL; 1459 struct dentry *dentry = path->dentry; 1460 struct inode *inode = d_inode(dentry); 1461 1462 acl.version = 4; 1463 acl.hash_type = XATTR_SD_HASH_TYPE_SHA256; 1464 acl.current_time = ksmbd_UnixTimeToNT(current_time(inode)); 1465 1466 memcpy(acl.desc, "posix_acl", 9); 1467 acl.desc_len = 10; 1468 1469 pntsd->osidoffset = 1470 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF); 1471 pntsd->gsidoffset = 1472 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF); 1473 pntsd->dacloffset = 1474 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF); 1475 1476 acl.sd_buf = (char *)pntsd; 1477 acl.sd_size = len; 1478 1479 rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash); 1480 if (rc) { 1481 pr_err("failed to generate hash for ndr acl\n"); 1482 return rc; 1483 } 1484 1485 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1486 ACL_TYPE_ACCESS); 1487 if (S_ISDIR(inode->i_mode)) 1488 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1489 ACL_TYPE_DEFAULT); 1490 1491 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, 1492 smb_acl, def_smb_acl); 1493 if (rc) { 1494 pr_err("failed to encode ndr to posix acl\n"); 1495 goto out; 1496 } 1497 1498 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, 1499 acl.posix_acl_hash); 1500 if (rc) { 1501 pr_err("failed to generate hash for ndr acl\n"); 1502 goto out; 1503 } 1504 1505 rc = ndr_encode_v4_ntacl(&sd_ndr, &acl); 1506 if (rc) { 1507 pr_err("failed to encode ndr to posix acl\n"); 1508 goto out; 1509 } 1510 1511 rc = ksmbd_vfs_setxattr(idmap, path, 1512 XATTR_NAME_SD, sd_ndr.data, 1513 sd_ndr.offset, 0, get_write); 1514 if (rc < 0) 1515 pr_err("Failed to store XATTR ntacl :%d\n", rc); 1516 1517 kfree(sd_ndr.data); 1518 out: 1519 kfree(acl_ndr.data); 1520 kfree(smb_acl); 1521 kfree(def_smb_acl); 1522 return rc; 1523 } 1524 1525 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn, 1526 struct mnt_idmap *idmap, 1527 struct dentry *dentry, 1528 struct smb_ntsd **pntsd) 1529 { 1530 int rc; 1531 struct ndr n; 1532 struct inode *inode = d_inode(dentry); 1533 struct ndr acl_ndr = {0}; 1534 struct xattr_ntacl acl; 1535 struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL; 1536 __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0}; 1537 1538 rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data); 1539 if (rc <= 0) 1540 return rc; 1541 1542 n.length = rc; 1543 rc = ndr_decode_v4_ntacl(&n, &acl); 1544 if (rc) 1545 goto free_n_data; 1546 1547 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1548 ACL_TYPE_ACCESS); 1549 if (S_ISDIR(inode->i_mode)) 1550 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1551 ACL_TYPE_DEFAULT); 1552 1553 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl, 1554 def_smb_acl); 1555 if (rc) { 1556 pr_err("failed to encode ndr to posix acl\n"); 1557 goto out_free; 1558 } 1559 1560 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash); 1561 if (rc) { 1562 pr_err("failed to generate hash for ndr acl\n"); 1563 goto out_free; 1564 } 1565 1566 if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) { 1567 pr_err("hash value diff\n"); 1568 rc = -EINVAL; 1569 goto out_free; 1570 } 1571 1572 *pntsd = acl.sd_buf; 1573 if (acl.sd_size < sizeof(struct smb_ntsd)) { 1574 pr_err("sd size is invalid\n"); 1575 goto out_free; 1576 } 1577 1578 (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) - 1579 NDR_NTSD_OFFSETOF); 1580 (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) - 1581 NDR_NTSD_OFFSETOF); 1582 (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) - 1583 NDR_NTSD_OFFSETOF); 1584 1585 rc = acl.sd_size; 1586 out_free: 1587 kfree(acl_ndr.data); 1588 kfree(smb_acl); 1589 kfree(def_smb_acl); 1590 if (rc < 0) { 1591 kfree(acl.sd_buf); 1592 *pntsd = NULL; 1593 } 1594 1595 free_n_data: 1596 kfree(n.data); 1597 return rc; 1598 } 1599 1600 int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap, 1601 const struct path *path, 1602 struct xattr_dos_attrib *da, 1603 bool get_write) 1604 { 1605 struct ndr n; 1606 int err; 1607 1608 err = ndr_encode_dos_attr(&n, da); 1609 if (err) 1610 return err; 1611 1612 err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE, 1613 (void *)n.data, n.offset, 0, get_write); 1614 if (err) 1615 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n"); 1616 kfree(n.data); 1617 1618 return err; 1619 } 1620 1621 int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap, 1622 struct dentry *dentry, 1623 struct xattr_dos_attrib *da) 1624 { 1625 struct ndr n; 1626 int err; 1627 1628 err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE, 1629 (char **)&n.data); 1630 if (err > 0) { 1631 n.length = err; 1632 if (ndr_decode_dos_attr(&n, da)) 1633 err = -EINVAL; 1634 kfree(n.data); 1635 } else { 1636 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n"); 1637 } 1638 1639 return err; 1640 } 1641 1642 /** 1643 * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format 1644 * @p: destination buffer 1645 * @ksmbd_kstat: ksmbd kstat wrapper 1646 * 1647 * Returns: pointer to the converted &struct file_directory_info 1648 */ 1649 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat) 1650 { 1651 struct file_directory_info *info = (struct file_directory_info *)(*p); 1652 struct kstat *kstat = ksmbd_kstat->kstat; 1653 u64 time; 1654 1655 info->FileIndex = 0; 1656 info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time); 1657 time = ksmbd_UnixTimeToNT(kstat->atime); 1658 info->LastAccessTime = cpu_to_le64(time); 1659 time = ksmbd_UnixTimeToNT(kstat->mtime); 1660 info->LastWriteTime = cpu_to_le64(time); 1661 time = ksmbd_UnixTimeToNT(kstat->ctime); 1662 info->ChangeTime = cpu_to_le64(time); 1663 1664 if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) { 1665 info->EndOfFile = 0; 1666 info->AllocationSize = 0; 1667 } else { 1668 info->EndOfFile = cpu_to_le64(kstat->size); 1669 info->AllocationSize = cpu_to_le64(kstat->blocks << 9); 1670 } 1671 info->ExtFileAttributes = ksmbd_kstat->file_attributes; 1672 1673 return info; 1674 } 1675 1676 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work, 1677 struct mnt_idmap *idmap, 1678 struct dentry *dentry, 1679 struct ksmbd_kstat *ksmbd_kstat) 1680 { 1681 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 1682 u64 time; 1683 int rc; 1684 struct path path = { 1685 .mnt = share_conf->vfs_path.mnt, 1686 .dentry = dentry, 1687 }; 1688 1689 rc = vfs_getattr(&path, ksmbd_kstat->kstat, 1690 STATX_BASIC_STATS | STATX_BTIME, 1691 AT_STATX_SYNC_AS_STAT); 1692 if (rc) 1693 return rc; 1694 1695 time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime); 1696 ksmbd_kstat->create_time = time; 1697 1698 /* 1699 * set default value for the case that store dos attributes is not yes 1700 * or that acl is disable in server's filesystem and the config is yes. 1701 */ 1702 if (S_ISDIR(ksmbd_kstat->kstat->mode)) 1703 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE; 1704 else 1705 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE; 1706 1707 if (test_share_config_flag(work->tcon->share_conf, 1708 KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) { 1709 struct xattr_dos_attrib da; 1710 1711 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da); 1712 if (rc > 0) { 1713 ksmbd_kstat->file_attributes = cpu_to_le32(da.attr); 1714 ksmbd_kstat->create_time = da.create_time; 1715 } else { 1716 ksmbd_debug(VFS, "fail to load dos attribute.\n"); 1717 } 1718 } 1719 1720 return 0; 1721 } 1722 1723 ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap, 1724 struct dentry *dentry, char *attr_name, 1725 int attr_name_len) 1726 { 1727 char *name, *xattr_list = NULL; 1728 ssize_t value_len = -ENOENT, xattr_list_len; 1729 1730 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list); 1731 if (xattr_list_len <= 0) 1732 goto out; 1733 1734 for (name = xattr_list; name - xattr_list < xattr_list_len; 1735 name += strlen(name) + 1) { 1736 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name)); 1737 if (strncasecmp(attr_name, name, attr_name_len)) 1738 continue; 1739 1740 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name); 1741 break; 1742 } 1743 1744 out: 1745 kvfree(xattr_list); 1746 return value_len; 1747 } 1748 1749 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name, 1750 size_t *xattr_stream_name_size, int s_type) 1751 { 1752 char *type, *buf; 1753 1754 if (s_type == DIR_STREAM) 1755 type = ":$INDEX_ALLOCATION"; 1756 else 1757 type = ":$DATA"; 1758 1759 buf = kasprintf(KSMBD_DEFAULT_GFP, "%s%s%s", 1760 XATTR_NAME_STREAM, stream_name, type); 1761 if (!buf) 1762 return -ENOMEM; 1763 1764 *xattr_stream_name = buf; 1765 *xattr_stream_name_size = strlen(buf) + 1; 1766 1767 return 0; 1768 } 1769 1770 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work, 1771 struct ksmbd_file *src_fp, 1772 struct ksmbd_file *dst_fp, 1773 struct srv_copychunk *chunks, 1774 unsigned int chunk_count, 1775 unsigned int *chunk_count_written, 1776 unsigned int *chunk_size_written, 1777 loff_t *total_size_written) 1778 { 1779 unsigned int i; 1780 loff_t src_off, dst_off, src_file_size; 1781 size_t len; 1782 int ret; 1783 1784 *chunk_count_written = 0; 1785 *chunk_size_written = 0; 1786 *total_size_written = 0; 1787 1788 if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) { 1789 pr_err("no right to read(%pD)\n", src_fp->filp); 1790 return -EACCES; 1791 } 1792 if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) { 1793 pr_err("no right to write(%pD)\n", dst_fp->filp); 1794 return -EACCES; 1795 } 1796 1797 if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp)) 1798 return -EBADF; 1799 1800 smb_break_all_levII_oplock(work, dst_fp, 1); 1801 1802 if (!work->tcon->posix_extensions) { 1803 for (i = 0; i < chunk_count; i++) { 1804 src_off = le64_to_cpu(chunks[i].SourceOffset); 1805 dst_off = le64_to_cpu(chunks[i].TargetOffset); 1806 len = le32_to_cpu(chunks[i].Length); 1807 1808 if (check_lock_range(src_fp->filp, src_off, 1809 src_off + len - 1, READ)) 1810 return -EAGAIN; 1811 if (check_lock_range(dst_fp->filp, dst_off, 1812 dst_off + len - 1, WRITE)) 1813 return -EAGAIN; 1814 } 1815 } 1816 1817 src_file_size = i_size_read(file_inode(src_fp->filp)); 1818 1819 for (i = 0; i < chunk_count; i++) { 1820 src_off = le64_to_cpu(chunks[i].SourceOffset); 1821 dst_off = le64_to_cpu(chunks[i].TargetOffset); 1822 len = le32_to_cpu(chunks[i].Length); 1823 1824 if (src_off + len > src_file_size) 1825 return -E2BIG; 1826 1827 ret = vfs_copy_file_range(src_fp->filp, src_off, 1828 dst_fp->filp, dst_off, len, 0); 1829 if (ret == -EOPNOTSUPP || ret == -EXDEV) 1830 ret = vfs_copy_file_range(src_fp->filp, src_off, 1831 dst_fp->filp, dst_off, len, 1832 COPY_FILE_SPLICE); 1833 if (ret < 0) 1834 return ret; 1835 1836 *chunk_count_written += 1; 1837 *total_size_written += ret; 1838 } 1839 return 0; 1840 } 1841 1842 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock) 1843 { 1844 wait_event(flock->c.flc_wait, !flock->c.flc_blocker); 1845 } 1846 1847 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock) 1848 { 1849 locks_delete_block(flock); 1850 } 1851 1852 int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap, 1853 struct path *path) 1854 { 1855 struct posix_acl_state acl_state; 1856 struct posix_acl *acls; 1857 struct dentry *dentry = path->dentry; 1858 struct inode *inode = d_inode(dentry); 1859 int rc; 1860 1861 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1862 return -EOPNOTSUPP; 1863 1864 ksmbd_debug(SMB, "Set posix acls\n"); 1865 rc = init_acl_state(&acl_state, 1); 1866 if (rc) 1867 return rc; 1868 1869 /* Set default owner group */ 1870 acl_state.owner.allow = (inode->i_mode & 0700) >> 6; 1871 acl_state.group.allow = (inode->i_mode & 0070) >> 3; 1872 acl_state.other.allow = inode->i_mode & 0007; 1873 acl_state.users->aces[acl_state.users->n].uid = inode->i_uid; 1874 acl_state.users->aces[acl_state.users->n++].perms.allow = 1875 acl_state.owner.allow; 1876 acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid; 1877 acl_state.groups->aces[acl_state.groups->n++].perms.allow = 1878 acl_state.group.allow; 1879 acl_state.mask.allow = 0x07; 1880 1881 acls = posix_acl_alloc(6, KSMBD_DEFAULT_GFP); 1882 if (!acls) { 1883 free_acl_state(&acl_state); 1884 return -ENOMEM; 1885 } 1886 posix_state_to_acl(&acl_state, acls->a_entries); 1887 1888 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls); 1889 if (rc < 0) 1890 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", 1891 rc); 1892 else if (S_ISDIR(inode->i_mode)) { 1893 posix_state_to_acl(&acl_state, acls->a_entries); 1894 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls); 1895 if (rc < 0) 1896 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", 1897 rc); 1898 } 1899 1900 free_acl_state(&acl_state); 1901 posix_acl_release(acls); 1902 return rc; 1903 } 1904 1905 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap, 1906 struct path *path, struct inode *parent_inode) 1907 { 1908 struct posix_acl *acls; 1909 struct posix_acl_entry *pace; 1910 struct dentry *dentry = path->dentry; 1911 struct inode *inode = d_inode(dentry); 1912 int rc, i; 1913 1914 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1915 return -EOPNOTSUPP; 1916 1917 acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT); 1918 if (IS_ERR_OR_NULL(acls)) 1919 return -ENOENT; 1920 pace = acls->a_entries; 1921 1922 for (i = 0; i < acls->a_count; i++, pace++) { 1923 if (pace->e_tag == ACL_MASK) { 1924 pace->e_perm = 0x07; 1925 break; 1926 } 1927 } 1928 1929 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls); 1930 if (rc < 0) 1931 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", 1932 rc); 1933 if (S_ISDIR(inode->i_mode)) { 1934 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, 1935 acls); 1936 if (rc < 0) 1937 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", 1938 rc); 1939 } 1940 1941 posix_acl_release(acls); 1942 return rc; 1943 } 1944