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