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 /* 754 * explicitly handle file overwrite case, for compatibility with 755 * filesystems that may not support rename flags (e.g: fuse) 756 */ 757 if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) { 758 err = -EEXIST; 759 goto out4; 760 } 761 flags &= ~(RENAME_NOREPLACE); 762 763 if (old_child == trap) { 764 err = -EINVAL; 765 goto out4; 766 } 767 768 if (new_dentry == trap) { 769 err = -ENOTEMPTY; 770 goto out4; 771 } 772 773 rd.old_mnt_idmap = mnt_idmap(old_path->mnt), 774 rd.old_dir = d_inode(old_parent), 775 rd.old_dentry = old_child, 776 rd.new_mnt_idmap = mnt_idmap(new_path.mnt), 777 rd.new_dir = new_path.dentry->d_inode, 778 rd.new_dentry = new_dentry, 779 rd.flags = flags, 780 rd.delegated_inode = NULL, 781 err = vfs_rename(&rd); 782 if (err) 783 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err); 784 785 out4: 786 dput(new_dentry); 787 out3: 788 dput(old_parent); 789 unlock_rename(old_parent, new_path.dentry); 790 mnt_drop_write(old_path->mnt); 791 out2: 792 path_put(&new_path); 793 794 if (retry_estale(err, lookup_flags)) { 795 lookup_flags |= LOOKUP_REVAL; 796 goto retry; 797 } 798 out1: 799 putname(to); 800 revert_fsids: 801 ksmbd_revert_fsids(work); 802 return err; 803 } 804 805 /** 806 * ksmbd_vfs_truncate() - vfs helper for smb file truncate 807 * @work: work 808 * @fp: ksmbd file pointer 809 * @size: truncate to given size 810 * 811 * Return: 0 on success, otherwise error 812 */ 813 int ksmbd_vfs_truncate(struct ksmbd_work *work, 814 struct ksmbd_file *fp, loff_t size) 815 { 816 int err = 0; 817 struct file *filp; 818 819 filp = fp->filp; 820 821 /* Do we need to break any of a levelII oplock? */ 822 smb_break_all_levII_oplock(work, fp, 1); 823 824 if (!work->tcon->posix_extensions) { 825 struct inode *inode = file_inode(filp); 826 827 if (size < inode->i_size) { 828 err = check_lock_range(filp, size, 829 inode->i_size - 1, WRITE); 830 } else { 831 err = check_lock_range(filp, inode->i_size, 832 size - 1, WRITE); 833 } 834 835 if (err) { 836 pr_err("failed due to lock\n"); 837 return -EAGAIN; 838 } 839 } 840 841 err = vfs_truncate(&filp->f_path, size); 842 if (err) 843 pr_err("truncate failed, err %d\n", err); 844 return err; 845 } 846 847 /** 848 * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes 849 * @dentry: dentry of file for listing xattrs 850 * @list: destination buffer 851 * 852 * Return: xattr list length on success, otherwise error 853 */ 854 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list) 855 { 856 ssize_t size; 857 char *vlist = NULL; 858 859 size = vfs_listxattr(dentry, NULL, 0); 860 if (size <= 0) 861 return size; 862 863 vlist = kvzalloc(size, GFP_KERNEL); 864 if (!vlist) 865 return -ENOMEM; 866 867 *list = vlist; 868 size = vfs_listxattr(dentry, vlist, size); 869 if (size < 0) { 870 ksmbd_debug(VFS, "listxattr failed\n"); 871 kvfree(vlist); 872 *list = NULL; 873 } 874 875 return size; 876 } 877 878 static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap, 879 struct dentry *dentry, char *xattr_name) 880 { 881 return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0); 882 } 883 884 /** 885 * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value 886 * @idmap: idmap 887 * @dentry: dentry of file for getting xattrs 888 * @xattr_name: name of xattr name to query 889 * @xattr_buf: destination buffer xattr value 890 * 891 * Return: read xattr value length on success, otherwise error 892 */ 893 ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap, 894 struct dentry *dentry, 895 char *xattr_name, char **xattr_buf) 896 { 897 ssize_t xattr_len; 898 char *buf; 899 900 *xattr_buf = NULL; 901 xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name); 902 if (xattr_len < 0) 903 return xattr_len; 904 905 buf = kmalloc(xattr_len + 1, GFP_KERNEL); 906 if (!buf) 907 return -ENOMEM; 908 909 xattr_len = vfs_getxattr(idmap, dentry, xattr_name, 910 (void *)buf, xattr_len); 911 if (xattr_len > 0) 912 *xattr_buf = buf; 913 else 914 kfree(buf); 915 return xattr_len; 916 } 917 918 /** 919 * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value 920 * @idmap: idmap of the relevant mount 921 * @path: path of dentry to set XATTR at 922 * @attr_name: xattr name for setxattr 923 * @attr_value: xattr value to set 924 * @attr_size: size of xattr value 925 * @flags: destination buffer length 926 * @get_write: get write access to a mount 927 * 928 * Return: 0 on success, otherwise error 929 */ 930 int ksmbd_vfs_setxattr(struct mnt_idmap *idmap, 931 const struct path *path, const char *attr_name, 932 void *attr_value, size_t attr_size, int flags, 933 bool get_write) 934 { 935 int err; 936 937 if (get_write == true) { 938 err = mnt_want_write(path->mnt); 939 if (err) 940 return err; 941 } 942 943 err = vfs_setxattr(idmap, 944 path->dentry, 945 attr_name, 946 attr_value, 947 attr_size, 948 flags); 949 if (err) 950 ksmbd_debug(VFS, "setxattr failed, err %d\n", err); 951 if (get_write == true) 952 mnt_drop_write(path->mnt); 953 return err; 954 } 955 956 /** 957 * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options 958 * @filp: file pointer for IO 959 * @option: smb IO options 960 */ 961 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option) 962 { 963 struct address_space *mapping; 964 965 mapping = filp->f_mapping; 966 967 if (!option || !mapping) 968 return; 969 970 if (option & FILE_WRITE_THROUGH_LE) { 971 filp->f_flags |= O_SYNC; 972 } else if (option & FILE_SEQUENTIAL_ONLY_LE) { 973 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2; 974 spin_lock(&filp->f_lock); 975 filp->f_mode &= ~FMODE_RANDOM; 976 spin_unlock(&filp->f_lock); 977 } else if (option & FILE_RANDOM_ACCESS_LE) { 978 spin_lock(&filp->f_lock); 979 filp->f_mode |= FMODE_RANDOM; 980 spin_unlock(&filp->f_lock); 981 } 982 } 983 984 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp, 985 loff_t off, loff_t len) 986 { 987 smb_break_all_levII_oplock(work, fp, 1); 988 if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE) 989 return vfs_fallocate(fp->filp, 990 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 991 off, len); 992 993 return vfs_fallocate(fp->filp, 994 FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE, 995 off, len); 996 } 997 998 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length, 999 struct file_allocated_range_buffer *ranges, 1000 unsigned int in_count, unsigned int *out_count) 1001 { 1002 struct file *f = fp->filp; 1003 struct inode *inode = file_inode(fp->filp); 1004 loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end; 1005 loff_t extent_start, extent_end; 1006 int ret = 0; 1007 1008 if (start > maxbytes) 1009 return -EFBIG; 1010 1011 if (!in_count) 1012 return 0; 1013 1014 /* 1015 * Shrink request scope to what the fs can actually handle. 1016 */ 1017 if (length > maxbytes || (maxbytes - length) < start) 1018 length = maxbytes - start; 1019 1020 if (start + length > inode->i_size) 1021 length = inode->i_size - start; 1022 1023 *out_count = 0; 1024 end = start + length; 1025 while (start < end && *out_count < in_count) { 1026 extent_start = vfs_llseek(f, start, SEEK_DATA); 1027 if (extent_start < 0) { 1028 if (extent_start != -ENXIO) 1029 ret = (int)extent_start; 1030 break; 1031 } 1032 1033 if (extent_start >= end) 1034 break; 1035 1036 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE); 1037 if (extent_end < 0) { 1038 if (extent_end != -ENXIO) 1039 ret = (int)extent_end; 1040 break; 1041 } else if (extent_start >= extent_end) { 1042 break; 1043 } 1044 1045 ranges[*out_count].file_offset = cpu_to_le64(extent_start); 1046 ranges[(*out_count)++].length = 1047 cpu_to_le64(min(extent_end, end) - extent_start); 1048 1049 start = extent_end; 1050 } 1051 1052 return ret; 1053 } 1054 1055 int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap, 1056 const struct path *path, char *attr_name) 1057 { 1058 int err; 1059 1060 err = mnt_want_write(path->mnt); 1061 if (err) 1062 return err; 1063 1064 err = vfs_removexattr(idmap, path->dentry, attr_name); 1065 mnt_drop_write(path->mnt); 1066 1067 return err; 1068 } 1069 1070 int ksmbd_vfs_unlink(struct file *filp) 1071 { 1072 int err = 0; 1073 struct dentry *dir, *dentry = filp->f_path.dentry; 1074 struct mnt_idmap *idmap = file_mnt_idmap(filp); 1075 1076 err = mnt_want_write(filp->f_path.mnt); 1077 if (err) 1078 return err; 1079 1080 dir = dget_parent(dentry); 1081 err = ksmbd_vfs_lock_parent(dir, dentry); 1082 if (err) 1083 goto out; 1084 dget(dentry); 1085 1086 if (S_ISDIR(d_inode(dentry)->i_mode)) 1087 err = vfs_rmdir(idmap, d_inode(dir), dentry); 1088 else 1089 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL); 1090 1091 dput(dentry); 1092 inode_unlock(d_inode(dir)); 1093 if (err) 1094 ksmbd_debug(VFS, "failed to delete, err %d\n", err); 1095 out: 1096 dput(dir); 1097 mnt_drop_write(filp->f_path.mnt); 1098 1099 return err; 1100 } 1101 1102 static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen, 1103 loff_t offset, u64 ino, unsigned int d_type) 1104 { 1105 struct ksmbd_readdir_data *buf; 1106 1107 buf = container_of(ctx, struct ksmbd_readdir_data, ctx); 1108 buf->dirent_count++; 1109 1110 return buf->dirent_count <= 2; 1111 } 1112 1113 /** 1114 * ksmbd_vfs_empty_dir() - check for empty directory 1115 * @fp: ksmbd file pointer 1116 * 1117 * Return: true if directory empty, otherwise false 1118 */ 1119 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp) 1120 { 1121 int err; 1122 struct ksmbd_readdir_data readdir_data; 1123 1124 memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data)); 1125 1126 set_ctx_actor(&readdir_data.ctx, __dir_empty); 1127 readdir_data.dirent_count = 0; 1128 1129 err = iterate_dir(fp->filp, &readdir_data.ctx); 1130 if (readdir_data.dirent_count > 2) 1131 err = -ENOTEMPTY; 1132 else 1133 err = 0; 1134 return err; 1135 } 1136 1137 static bool __caseless_lookup(struct dir_context *ctx, const char *name, 1138 int namlen, loff_t offset, u64 ino, 1139 unsigned int d_type) 1140 { 1141 struct ksmbd_readdir_data *buf; 1142 int cmp = -EINVAL; 1143 1144 buf = container_of(ctx, struct ksmbd_readdir_data, ctx); 1145 1146 if (buf->used != namlen) 1147 return true; 1148 if (IS_ENABLED(CONFIG_UNICODE) && buf->um) { 1149 const struct qstr q_buf = {.name = buf->private, 1150 .len = buf->used}; 1151 const struct qstr q_name = {.name = name, 1152 .len = namlen}; 1153 1154 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name); 1155 } 1156 if (cmp < 0) 1157 cmp = strncasecmp((char *)buf->private, name, namlen); 1158 if (!cmp) { 1159 memcpy((char *)buf->private, name, namlen); 1160 buf->dirent_count = 1; 1161 return false; 1162 } 1163 return true; 1164 } 1165 1166 /** 1167 * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory 1168 * @dir: path info 1169 * @name: filename to lookup 1170 * @namelen: filename length 1171 * @um: &struct unicode_map to use 1172 * 1173 * Return: 0 on success, otherwise error 1174 */ 1175 static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name, 1176 size_t namelen, struct unicode_map *um) 1177 { 1178 int ret; 1179 struct file *dfilp; 1180 int flags = O_RDONLY | O_LARGEFILE; 1181 struct ksmbd_readdir_data readdir_data = { 1182 .ctx.actor = __caseless_lookup, 1183 .private = name, 1184 .used = namelen, 1185 .dirent_count = 0, 1186 .um = um, 1187 }; 1188 1189 dfilp = dentry_open(dir, flags, current_cred()); 1190 if (IS_ERR(dfilp)) 1191 return PTR_ERR(dfilp); 1192 1193 ret = iterate_dir(dfilp, &readdir_data.ctx); 1194 if (readdir_data.dirent_count > 0) 1195 ret = 0; 1196 fput(dfilp); 1197 return ret; 1198 } 1199 1200 /** 1201 * ksmbd_vfs_kern_path_locked() - lookup a file and get path info 1202 * @work: work 1203 * @name: file path that is relative to share 1204 * @flags: lookup flags 1205 * @parent_path: if lookup succeed, return parent_path info 1206 * @path: if lookup succeed, return path info 1207 * @caseless: caseless filename lookup 1208 * 1209 * Return: 0 on success, otherwise error 1210 */ 1211 int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name, 1212 unsigned int flags, struct path *parent_path, 1213 struct path *path, bool caseless) 1214 { 1215 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 1216 int err; 1217 1218 err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path, 1219 path); 1220 if (!err) 1221 return 0; 1222 1223 if (caseless) { 1224 char *filepath; 1225 size_t path_len, remain_len; 1226 1227 filepath = kstrdup(name, GFP_KERNEL); 1228 if (!filepath) 1229 return -ENOMEM; 1230 1231 path_len = strlen(filepath); 1232 remain_len = path_len; 1233 1234 *parent_path = share_conf->vfs_path; 1235 path_get(parent_path); 1236 1237 while (d_can_lookup(parent_path->dentry)) { 1238 char *filename = filepath + path_len - remain_len; 1239 char *next = strchrnul(filename, '/'); 1240 size_t filename_len = next - filename; 1241 bool is_last = !next[0]; 1242 1243 if (filename_len == 0) 1244 break; 1245 1246 err = ksmbd_vfs_lookup_in_dir(parent_path, filename, 1247 filename_len, 1248 work->conn->um); 1249 if (err) 1250 goto out2; 1251 1252 next[0] = '\0'; 1253 1254 err = vfs_path_lookup(share_conf->vfs_path.dentry, 1255 share_conf->vfs_path.mnt, 1256 filepath, 1257 flags, 1258 path); 1259 if (err) 1260 goto out2; 1261 else if (is_last) 1262 goto out1; 1263 path_put(parent_path); 1264 *parent_path = *path; 1265 1266 next[0] = '/'; 1267 remain_len -= filename_len + 1; 1268 } 1269 1270 err = -EINVAL; 1271 out2: 1272 path_put(parent_path); 1273 out1: 1274 kfree(filepath); 1275 } 1276 1277 if (!err) { 1278 err = mnt_want_write(parent_path->mnt); 1279 if (err) { 1280 path_put(path); 1281 path_put(parent_path); 1282 return err; 1283 } 1284 1285 err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry); 1286 if (err) { 1287 path_put(path); 1288 path_put(parent_path); 1289 } 1290 } 1291 return err; 1292 } 1293 1294 void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path) 1295 { 1296 inode_unlock(d_inode(parent_path->dentry)); 1297 mnt_drop_write(parent_path->mnt); 1298 path_put(path); 1299 path_put(parent_path); 1300 } 1301 1302 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work, 1303 const char *name, 1304 unsigned int flags, 1305 struct path *path) 1306 { 1307 char *abs_name; 1308 struct dentry *dent; 1309 1310 abs_name = convert_to_unix_name(work->tcon->share_conf, name); 1311 if (!abs_name) 1312 return ERR_PTR(-ENOMEM); 1313 1314 dent = kern_path_create(AT_FDCWD, abs_name, path, flags); 1315 kfree(abs_name); 1316 return dent; 1317 } 1318 1319 int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap, 1320 const struct path *path) 1321 { 1322 char *name, *xattr_list = NULL; 1323 ssize_t xattr_list_len; 1324 int err = 0; 1325 1326 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list); 1327 if (xattr_list_len < 0) { 1328 goto out; 1329 } else if (!xattr_list_len) { 1330 ksmbd_debug(SMB, "empty xattr in the file\n"); 1331 goto out; 1332 } 1333 1334 err = mnt_want_write(path->mnt); 1335 if (err) 1336 goto out; 1337 1338 for (name = xattr_list; name - xattr_list < xattr_list_len; 1339 name += strlen(name) + 1) { 1340 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name)); 1341 1342 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS, 1343 sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) || 1344 !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT, 1345 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) { 1346 err = vfs_remove_acl(idmap, path->dentry, name); 1347 if (err) 1348 ksmbd_debug(SMB, 1349 "remove acl xattr failed : %s\n", name); 1350 } 1351 } 1352 mnt_drop_write(path->mnt); 1353 1354 out: 1355 kvfree(xattr_list); 1356 return err; 1357 } 1358 1359 int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path) 1360 { 1361 char *name, *xattr_list = NULL; 1362 ssize_t xattr_list_len; 1363 int err = 0; 1364 1365 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list); 1366 if (xattr_list_len < 0) { 1367 goto out; 1368 } else if (!xattr_list_len) { 1369 ksmbd_debug(SMB, "empty xattr in the file\n"); 1370 goto out; 1371 } 1372 1373 for (name = xattr_list; name - xattr_list < xattr_list_len; 1374 name += strlen(name) + 1) { 1375 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name)); 1376 1377 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) { 1378 err = ksmbd_vfs_remove_xattr(idmap, path, name); 1379 if (err) 1380 ksmbd_debug(SMB, "remove xattr failed : %s\n", name); 1381 } 1382 } 1383 out: 1384 kvfree(xattr_list); 1385 return err; 1386 } 1387 1388 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap, 1389 struct inode *inode, 1390 int acl_type) 1391 { 1392 struct xattr_smb_acl *smb_acl = NULL; 1393 struct posix_acl *posix_acls; 1394 struct posix_acl_entry *pa_entry; 1395 struct xattr_acl_entry *xa_entry; 1396 int i; 1397 1398 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1399 return NULL; 1400 1401 posix_acls = get_inode_acl(inode, acl_type); 1402 if (IS_ERR_OR_NULL(posix_acls)) 1403 return NULL; 1404 1405 smb_acl = kzalloc(sizeof(struct xattr_smb_acl) + 1406 sizeof(struct xattr_acl_entry) * posix_acls->a_count, 1407 GFP_KERNEL); 1408 if (!smb_acl) 1409 goto out; 1410 1411 smb_acl->count = posix_acls->a_count; 1412 pa_entry = posix_acls->a_entries; 1413 xa_entry = smb_acl->entries; 1414 for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) { 1415 switch (pa_entry->e_tag) { 1416 case ACL_USER: 1417 xa_entry->type = SMB_ACL_USER; 1418 xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry); 1419 break; 1420 case ACL_USER_OBJ: 1421 xa_entry->type = SMB_ACL_USER_OBJ; 1422 break; 1423 case ACL_GROUP: 1424 xa_entry->type = SMB_ACL_GROUP; 1425 xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry); 1426 break; 1427 case ACL_GROUP_OBJ: 1428 xa_entry->type = SMB_ACL_GROUP_OBJ; 1429 break; 1430 case ACL_OTHER: 1431 xa_entry->type = SMB_ACL_OTHER; 1432 break; 1433 case ACL_MASK: 1434 xa_entry->type = SMB_ACL_MASK; 1435 break; 1436 default: 1437 pr_err("unknown type : 0x%x\n", pa_entry->e_tag); 1438 goto out; 1439 } 1440 1441 if (pa_entry->e_perm & ACL_READ) 1442 xa_entry->perm |= SMB_ACL_READ; 1443 if (pa_entry->e_perm & ACL_WRITE) 1444 xa_entry->perm |= SMB_ACL_WRITE; 1445 if (pa_entry->e_perm & ACL_EXECUTE) 1446 xa_entry->perm |= SMB_ACL_EXECUTE; 1447 } 1448 out: 1449 posix_acl_release(posix_acls); 1450 return smb_acl; 1451 } 1452 1453 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn, 1454 struct mnt_idmap *idmap, 1455 const struct path *path, 1456 struct smb_ntsd *pntsd, int len, 1457 bool get_write) 1458 { 1459 int rc; 1460 struct ndr sd_ndr = {0}, acl_ndr = {0}; 1461 struct xattr_ntacl acl = {0}; 1462 struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL; 1463 struct dentry *dentry = path->dentry; 1464 struct inode *inode = d_inode(dentry); 1465 1466 acl.version = 4; 1467 acl.hash_type = XATTR_SD_HASH_TYPE_SHA256; 1468 acl.current_time = ksmbd_UnixTimeToNT(current_time(inode)); 1469 1470 memcpy(acl.desc, "posix_acl", 9); 1471 acl.desc_len = 10; 1472 1473 pntsd->osidoffset = 1474 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF); 1475 pntsd->gsidoffset = 1476 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF); 1477 pntsd->dacloffset = 1478 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF); 1479 1480 acl.sd_buf = (char *)pntsd; 1481 acl.sd_size = len; 1482 1483 rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash); 1484 if (rc) { 1485 pr_err("failed to generate hash for ndr acl\n"); 1486 return rc; 1487 } 1488 1489 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1490 ACL_TYPE_ACCESS); 1491 if (S_ISDIR(inode->i_mode)) 1492 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1493 ACL_TYPE_DEFAULT); 1494 1495 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, 1496 smb_acl, def_smb_acl); 1497 if (rc) { 1498 pr_err("failed to encode ndr to posix acl\n"); 1499 goto out; 1500 } 1501 1502 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, 1503 acl.posix_acl_hash); 1504 if (rc) { 1505 pr_err("failed to generate hash for ndr acl\n"); 1506 goto out; 1507 } 1508 1509 rc = ndr_encode_v4_ntacl(&sd_ndr, &acl); 1510 if (rc) { 1511 pr_err("failed to encode ndr to posix acl\n"); 1512 goto out; 1513 } 1514 1515 rc = ksmbd_vfs_setxattr(idmap, path, 1516 XATTR_NAME_SD, sd_ndr.data, 1517 sd_ndr.offset, 0, get_write); 1518 if (rc < 0) 1519 pr_err("Failed to store XATTR ntacl :%d\n", rc); 1520 1521 kfree(sd_ndr.data); 1522 out: 1523 kfree(acl_ndr.data); 1524 kfree(smb_acl); 1525 kfree(def_smb_acl); 1526 return rc; 1527 } 1528 1529 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn, 1530 struct mnt_idmap *idmap, 1531 struct dentry *dentry, 1532 struct smb_ntsd **pntsd) 1533 { 1534 int rc; 1535 struct ndr n; 1536 struct inode *inode = d_inode(dentry); 1537 struct ndr acl_ndr = {0}; 1538 struct xattr_ntacl acl; 1539 struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL; 1540 __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0}; 1541 1542 rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data); 1543 if (rc <= 0) 1544 return rc; 1545 1546 n.length = rc; 1547 rc = ndr_decode_v4_ntacl(&n, &acl); 1548 if (rc) 1549 goto free_n_data; 1550 1551 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1552 ACL_TYPE_ACCESS); 1553 if (S_ISDIR(inode->i_mode)) 1554 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1555 ACL_TYPE_DEFAULT); 1556 1557 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl, 1558 def_smb_acl); 1559 if (rc) { 1560 pr_err("failed to encode ndr to posix acl\n"); 1561 goto out_free; 1562 } 1563 1564 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash); 1565 if (rc) { 1566 pr_err("failed to generate hash for ndr acl\n"); 1567 goto out_free; 1568 } 1569 1570 if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) { 1571 pr_err("hash value diff\n"); 1572 rc = -EINVAL; 1573 goto out_free; 1574 } 1575 1576 *pntsd = acl.sd_buf; 1577 if (acl.sd_size < sizeof(struct smb_ntsd)) { 1578 pr_err("sd size is invalid\n"); 1579 goto out_free; 1580 } 1581 1582 (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) - 1583 NDR_NTSD_OFFSETOF); 1584 (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) - 1585 NDR_NTSD_OFFSETOF); 1586 (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) - 1587 NDR_NTSD_OFFSETOF); 1588 1589 rc = acl.sd_size; 1590 out_free: 1591 kfree(acl_ndr.data); 1592 kfree(smb_acl); 1593 kfree(def_smb_acl); 1594 if (rc < 0) { 1595 kfree(acl.sd_buf); 1596 *pntsd = NULL; 1597 } 1598 1599 free_n_data: 1600 kfree(n.data); 1601 return rc; 1602 } 1603 1604 int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap, 1605 const struct path *path, 1606 struct xattr_dos_attrib *da, 1607 bool get_write) 1608 { 1609 struct ndr n; 1610 int err; 1611 1612 err = ndr_encode_dos_attr(&n, da); 1613 if (err) 1614 return err; 1615 1616 err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE, 1617 (void *)n.data, n.offset, 0, get_write); 1618 if (err) 1619 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n"); 1620 kfree(n.data); 1621 1622 return err; 1623 } 1624 1625 int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap, 1626 struct dentry *dentry, 1627 struct xattr_dos_attrib *da) 1628 { 1629 struct ndr n; 1630 int err; 1631 1632 err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE, 1633 (char **)&n.data); 1634 if (err > 0) { 1635 n.length = err; 1636 if (ndr_decode_dos_attr(&n, da)) 1637 err = -EINVAL; 1638 kfree(n.data); 1639 } else { 1640 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n"); 1641 } 1642 1643 return err; 1644 } 1645 1646 /** 1647 * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format 1648 * @p: destination buffer 1649 * @ksmbd_kstat: ksmbd kstat wrapper 1650 * 1651 * Returns: pointer to the converted &struct file_directory_info 1652 */ 1653 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat) 1654 { 1655 struct file_directory_info *info = (struct file_directory_info *)(*p); 1656 struct kstat *kstat = ksmbd_kstat->kstat; 1657 u64 time; 1658 1659 info->FileIndex = 0; 1660 info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time); 1661 time = ksmbd_UnixTimeToNT(kstat->atime); 1662 info->LastAccessTime = cpu_to_le64(time); 1663 time = ksmbd_UnixTimeToNT(kstat->mtime); 1664 info->LastWriteTime = cpu_to_le64(time); 1665 time = ksmbd_UnixTimeToNT(kstat->ctime); 1666 info->ChangeTime = cpu_to_le64(time); 1667 1668 if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) { 1669 info->EndOfFile = 0; 1670 info->AllocationSize = 0; 1671 } else { 1672 info->EndOfFile = cpu_to_le64(kstat->size); 1673 info->AllocationSize = cpu_to_le64(kstat->blocks << 9); 1674 } 1675 info->ExtFileAttributes = ksmbd_kstat->file_attributes; 1676 1677 return info; 1678 } 1679 1680 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work, 1681 struct mnt_idmap *idmap, 1682 struct dentry *dentry, 1683 struct ksmbd_kstat *ksmbd_kstat) 1684 { 1685 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 1686 u64 time; 1687 int rc; 1688 struct path path = { 1689 .mnt = share_conf->vfs_path.mnt, 1690 .dentry = dentry, 1691 }; 1692 1693 rc = vfs_getattr(&path, ksmbd_kstat->kstat, 1694 STATX_BASIC_STATS | STATX_BTIME, 1695 AT_STATX_SYNC_AS_STAT); 1696 if (rc) 1697 return rc; 1698 1699 time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime); 1700 ksmbd_kstat->create_time = time; 1701 1702 /* 1703 * set default value for the case that store dos attributes is not yes 1704 * or that acl is disable in server's filesystem and the config is yes. 1705 */ 1706 if (S_ISDIR(ksmbd_kstat->kstat->mode)) 1707 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE; 1708 else 1709 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE; 1710 1711 if (test_share_config_flag(work->tcon->share_conf, 1712 KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) { 1713 struct xattr_dos_attrib da; 1714 1715 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da); 1716 if (rc > 0) { 1717 ksmbd_kstat->file_attributes = cpu_to_le32(da.attr); 1718 ksmbd_kstat->create_time = da.create_time; 1719 } else { 1720 ksmbd_debug(VFS, "fail to load dos attribute.\n"); 1721 } 1722 } 1723 1724 return 0; 1725 } 1726 1727 ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap, 1728 struct dentry *dentry, char *attr_name, 1729 int attr_name_len) 1730 { 1731 char *name, *xattr_list = NULL; 1732 ssize_t value_len = -ENOENT, xattr_list_len; 1733 1734 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list); 1735 if (xattr_list_len <= 0) 1736 goto out; 1737 1738 for (name = xattr_list; name - xattr_list < xattr_list_len; 1739 name += strlen(name) + 1) { 1740 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name)); 1741 if (strncasecmp(attr_name, name, attr_name_len)) 1742 continue; 1743 1744 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name); 1745 break; 1746 } 1747 1748 out: 1749 kvfree(xattr_list); 1750 return value_len; 1751 } 1752 1753 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name, 1754 size_t *xattr_stream_name_size, int s_type) 1755 { 1756 char *type, *buf; 1757 1758 if (s_type == DIR_STREAM) 1759 type = ":$INDEX_ALLOCATION"; 1760 else 1761 type = ":$DATA"; 1762 1763 buf = kasprintf(GFP_KERNEL, "%s%s%s", 1764 XATTR_NAME_STREAM, stream_name, type); 1765 if (!buf) 1766 return -ENOMEM; 1767 1768 *xattr_stream_name = buf; 1769 *xattr_stream_name_size = strlen(buf) + 1; 1770 1771 return 0; 1772 } 1773 1774 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work, 1775 struct ksmbd_file *src_fp, 1776 struct ksmbd_file *dst_fp, 1777 struct srv_copychunk *chunks, 1778 unsigned int chunk_count, 1779 unsigned int *chunk_count_written, 1780 unsigned int *chunk_size_written, 1781 loff_t *total_size_written) 1782 { 1783 unsigned int i; 1784 loff_t src_off, dst_off, src_file_size; 1785 size_t len; 1786 int ret; 1787 1788 *chunk_count_written = 0; 1789 *chunk_size_written = 0; 1790 *total_size_written = 0; 1791 1792 if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) { 1793 pr_err("no right to read(%pD)\n", src_fp->filp); 1794 return -EACCES; 1795 } 1796 if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) { 1797 pr_err("no right to write(%pD)\n", dst_fp->filp); 1798 return -EACCES; 1799 } 1800 1801 if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp)) 1802 return -EBADF; 1803 1804 smb_break_all_levII_oplock(work, dst_fp, 1); 1805 1806 if (!work->tcon->posix_extensions) { 1807 for (i = 0; i < chunk_count; i++) { 1808 src_off = le64_to_cpu(chunks[i].SourceOffset); 1809 dst_off = le64_to_cpu(chunks[i].TargetOffset); 1810 len = le32_to_cpu(chunks[i].Length); 1811 1812 if (check_lock_range(src_fp->filp, src_off, 1813 src_off + len - 1, READ)) 1814 return -EAGAIN; 1815 if (check_lock_range(dst_fp->filp, dst_off, 1816 dst_off + len - 1, WRITE)) 1817 return -EAGAIN; 1818 } 1819 } 1820 1821 src_file_size = i_size_read(file_inode(src_fp->filp)); 1822 1823 for (i = 0; i < chunk_count; i++) { 1824 src_off = le64_to_cpu(chunks[i].SourceOffset); 1825 dst_off = le64_to_cpu(chunks[i].TargetOffset); 1826 len = le32_to_cpu(chunks[i].Length); 1827 1828 if (src_off + len > src_file_size) 1829 return -E2BIG; 1830 1831 ret = vfs_copy_file_range(src_fp->filp, src_off, 1832 dst_fp->filp, dst_off, len, 0); 1833 if (ret == -EOPNOTSUPP || ret == -EXDEV) 1834 ret = vfs_copy_file_range(src_fp->filp, src_off, 1835 dst_fp->filp, dst_off, len, 1836 COPY_FILE_SPLICE); 1837 if (ret < 0) 1838 return ret; 1839 1840 *chunk_count_written += 1; 1841 *total_size_written += ret; 1842 } 1843 return 0; 1844 } 1845 1846 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock) 1847 { 1848 wait_event(flock->fl_wait, !flock->fl_blocker); 1849 } 1850 1851 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout) 1852 { 1853 return wait_event_interruptible_timeout(flock->fl_wait, 1854 !flock->fl_blocker, 1855 timeout); 1856 } 1857 1858 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock) 1859 { 1860 locks_delete_block(flock); 1861 } 1862 1863 int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap, 1864 struct path *path) 1865 { 1866 struct posix_acl_state acl_state; 1867 struct posix_acl *acls; 1868 struct dentry *dentry = path->dentry; 1869 struct inode *inode = d_inode(dentry); 1870 int rc; 1871 1872 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1873 return -EOPNOTSUPP; 1874 1875 ksmbd_debug(SMB, "Set posix acls\n"); 1876 rc = init_acl_state(&acl_state, 1); 1877 if (rc) 1878 return rc; 1879 1880 /* Set default owner group */ 1881 acl_state.owner.allow = (inode->i_mode & 0700) >> 6; 1882 acl_state.group.allow = (inode->i_mode & 0070) >> 3; 1883 acl_state.other.allow = inode->i_mode & 0007; 1884 acl_state.users->aces[acl_state.users->n].uid = inode->i_uid; 1885 acl_state.users->aces[acl_state.users->n++].perms.allow = 1886 acl_state.owner.allow; 1887 acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid; 1888 acl_state.groups->aces[acl_state.groups->n++].perms.allow = 1889 acl_state.group.allow; 1890 acl_state.mask.allow = 0x07; 1891 1892 acls = posix_acl_alloc(6, GFP_KERNEL); 1893 if (!acls) { 1894 free_acl_state(&acl_state); 1895 return -ENOMEM; 1896 } 1897 posix_state_to_acl(&acl_state, acls->a_entries); 1898 1899 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls); 1900 if (rc < 0) 1901 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", 1902 rc); 1903 else if (S_ISDIR(inode->i_mode)) { 1904 posix_state_to_acl(&acl_state, acls->a_entries); 1905 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls); 1906 if (rc < 0) 1907 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", 1908 rc); 1909 } 1910 1911 free_acl_state(&acl_state); 1912 posix_acl_release(acls); 1913 return rc; 1914 } 1915 1916 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap, 1917 struct path *path, struct inode *parent_inode) 1918 { 1919 struct posix_acl *acls; 1920 struct posix_acl_entry *pace; 1921 struct dentry *dentry = path->dentry; 1922 struct inode *inode = d_inode(dentry); 1923 int rc, i; 1924 1925 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1926 return -EOPNOTSUPP; 1927 1928 acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT); 1929 if (IS_ERR_OR_NULL(acls)) 1930 return -ENOENT; 1931 pace = acls->a_entries; 1932 1933 for (i = 0; i < acls->a_count; i++, pace++) { 1934 if (pace->e_tag == ACL_MASK) { 1935 pace->e_perm = 0x07; 1936 break; 1937 } 1938 } 1939 1940 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls); 1941 if (rc < 0) 1942 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", 1943 rc); 1944 if (S_ISDIR(inode->i_mode)) { 1945 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, 1946 acls); 1947 if (rc < 0) 1948 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", 1949 rc); 1950 } 1951 1952 posix_acl_release(acls); 1953 return rc; 1954 } 1955