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