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