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 *path) 67 { 68 struct qstr last; 69 struct filename *filename; 70 struct path *root_share_path = &share_conf->vfs_path; 71 int err, type; 72 struct path parent_path; 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 = share_conf->vfs_path.mnt; 112 path_put(&parent_path); 113 putname(filename); 114 115 return 0; 116 117 err_out: 118 inode_unlock(parent_path.dentry->d_inode); 119 path_put(&parent_path); 120 putname(filename); 121 return -ENOENT; 122 } 123 124 int ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap, 125 struct dentry *dentry, __le32 *daccess) 126 { 127 int ret = 0; 128 129 *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL); 130 131 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE)) 132 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE | 133 FILE_WRITE_DATA | FILE_APPEND_DATA | 134 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES | 135 FILE_DELETE_CHILD); 136 137 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ)) 138 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE; 139 140 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC)) 141 *daccess |= FILE_EXECUTE_LE; 142 143 if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE)) 144 *daccess |= FILE_DELETE_LE; 145 146 return ret; 147 } 148 149 /** 150 * ksmbd_vfs_create() - vfs helper for smb create file 151 * @work: work 152 * @name: file name that is relative to share 153 * @mode: file create mode 154 * 155 * Return: 0 on success, otherwise error 156 */ 157 int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode) 158 { 159 struct path path; 160 struct dentry *dentry; 161 int err; 162 163 dentry = ksmbd_vfs_kern_path_create(work, name, 164 LOOKUP_NO_SYMLINKS, &path); 165 if (IS_ERR(dentry)) { 166 err = PTR_ERR(dentry); 167 if (err != -ENOENT) 168 pr_err("path create failed for %s, err %d\n", 169 name, err); 170 return err; 171 } 172 173 err = mnt_want_write(path.mnt); 174 if (err) 175 goto out_err; 176 177 mode |= S_IFREG; 178 err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry), 179 dentry, mode, true); 180 if (!err) { 181 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), 182 d_inode(dentry)); 183 } else { 184 pr_err("File(%s): creation failed (err:%d)\n", name, err); 185 } 186 mnt_drop_write(path.mnt); 187 188 out_err: 189 done_path_create(&path, dentry); 190 return err; 191 } 192 193 /** 194 * ksmbd_vfs_mkdir() - vfs helper for smb create directory 195 * @work: work 196 * @name: directory name that is relative to share 197 * @mode: directory create mode 198 * 199 * Return: 0 on success, otherwise error 200 */ 201 int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode) 202 { 203 struct mnt_idmap *idmap; 204 struct path path; 205 struct dentry *dentry; 206 int err; 207 208 dentry = ksmbd_vfs_kern_path_create(work, name, 209 LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY, 210 &path); 211 if (IS_ERR(dentry)) { 212 err = PTR_ERR(dentry); 213 if (err != -EEXIST) 214 ksmbd_debug(VFS, "path create failed for %s, err %d\n", 215 name, err); 216 return err; 217 } 218 219 err = mnt_want_write(path.mnt); 220 if (err) 221 goto out_err2; 222 223 idmap = mnt_idmap(path.mnt); 224 mode |= S_IFDIR; 225 err = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode); 226 if (!err && d_unhashed(dentry)) { 227 struct dentry *d; 228 229 d = lookup_one(idmap, dentry->d_name.name, dentry->d_parent, 230 dentry->d_name.len); 231 if (IS_ERR(d)) { 232 err = PTR_ERR(d); 233 goto out_err1; 234 } 235 if (unlikely(d_is_negative(d))) { 236 dput(d); 237 err = -ENOENT; 238 goto out_err1; 239 } 240 241 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d)); 242 dput(d); 243 } 244 245 out_err1: 246 mnt_drop_write(path.mnt); 247 out_err2: 248 done_path_create(&path, dentry); 249 if (err) 250 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err); 251 return err; 252 } 253 254 static ssize_t ksmbd_vfs_getcasexattr(struct mnt_idmap *idmap, 255 struct dentry *dentry, char *attr_name, 256 int attr_name_len, char **attr_value) 257 { 258 char *name, *xattr_list = NULL; 259 ssize_t value_len = -ENOENT, xattr_list_len; 260 261 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list); 262 if (xattr_list_len <= 0) 263 goto out; 264 265 for (name = xattr_list; name - xattr_list < xattr_list_len; 266 name += strlen(name) + 1) { 267 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name)); 268 if (strncasecmp(attr_name, name, attr_name_len)) 269 continue; 270 271 value_len = ksmbd_vfs_getxattr(idmap, 272 dentry, 273 name, 274 attr_value); 275 if (value_len < 0) 276 pr_err("failed to get xattr in file\n"); 277 break; 278 } 279 280 out: 281 kvfree(xattr_list); 282 return value_len; 283 } 284 285 static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos, 286 size_t count) 287 { 288 ssize_t v_len; 289 char *stream_buf = NULL; 290 291 ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n", 292 *pos, count); 293 294 v_len = ksmbd_vfs_getcasexattr(file_mnt_idmap(fp->filp), 295 fp->filp->f_path.dentry, 296 fp->stream.name, 297 fp->stream.size, 298 &stream_buf); 299 if ((int)v_len <= 0) 300 return (int)v_len; 301 302 if (v_len <= *pos) { 303 count = -EINVAL; 304 goto free_buf; 305 } 306 307 if (v_len - *pos < count) 308 count = v_len - *pos; 309 310 memcpy(buf, &stream_buf[*pos], count); 311 312 free_buf: 313 kvfree(stream_buf); 314 return count; 315 } 316 317 /** 318 * check_lock_range() - vfs helper for smb byte range file locking 319 * @filp: the file to apply the lock to 320 * @start: lock start byte offset 321 * @end: lock end byte offset 322 * @type: byte range type read/write 323 * 324 * Return: 0 on success, otherwise error 325 */ 326 static int check_lock_range(struct file *filp, loff_t start, loff_t end, 327 unsigned char type) 328 { 329 struct file_lock *flock; 330 struct file_lock_context *ctx = locks_inode_context(file_inode(filp)); 331 int error = 0; 332 333 if (!ctx || list_empty_careful(&ctx->flc_posix)) 334 return 0; 335 336 spin_lock(&ctx->flc_lock); 337 list_for_each_entry(flock, &ctx->flc_posix, fl_list) { 338 /* check conflict locks */ 339 if (flock->fl_end >= start && end >= flock->fl_start) { 340 if (flock->fl_type == F_RDLCK) { 341 if (type == WRITE) { 342 pr_err("not allow write by shared lock\n"); 343 error = 1; 344 goto out; 345 } 346 } else if (flock->fl_type == F_WRLCK) { 347 /* check owner in lock */ 348 if (flock->fl_file != filp) { 349 error = 1; 350 pr_err("not allow rw access by exclusive lock from other opens\n"); 351 goto out; 352 } 353 } 354 } 355 } 356 out: 357 spin_unlock(&ctx->flc_lock); 358 return error; 359 } 360 361 /** 362 * ksmbd_vfs_read() - vfs helper for smb file read 363 * @work: smb work 364 * @fid: file id of open file 365 * @count: read byte count 366 * @pos: file pos 367 * 368 * Return: number of read bytes on success, otherwise error 369 */ 370 int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count, 371 loff_t *pos) 372 { 373 struct file *filp = fp->filp; 374 ssize_t nbytes = 0; 375 char *rbuf = work->aux_payload_buf; 376 struct inode *inode = file_inode(filp); 377 378 if (S_ISDIR(inode->i_mode)) 379 return -EISDIR; 380 381 if (unlikely(count == 0)) 382 return 0; 383 384 if (work->conn->connection_type) { 385 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) { 386 pr_err("no right to read(%pD)\n", fp->filp); 387 return -EACCES; 388 } 389 } 390 391 if (ksmbd_stream_fd(fp)) 392 return ksmbd_vfs_stream_read(fp, rbuf, pos, count); 393 394 if (!work->tcon->posix_extensions) { 395 int ret; 396 397 ret = check_lock_range(filp, *pos, *pos + count - 1, READ); 398 if (ret) { 399 pr_err("unable to read due to lock\n"); 400 return -EAGAIN; 401 } 402 } 403 404 nbytes = kernel_read(filp, rbuf, count, pos); 405 if (nbytes < 0) { 406 pr_err("smb read failed, err = %zd\n", nbytes); 407 return nbytes; 408 } 409 410 filp->f_pos = *pos; 411 return nbytes; 412 } 413 414 static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos, 415 size_t count) 416 { 417 char *stream_buf = NULL, *wbuf; 418 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp); 419 size_t size, v_len; 420 int err = 0; 421 422 ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n", 423 *pos, count); 424 425 size = *pos + count; 426 if (size > XATTR_SIZE_MAX) { 427 size = XATTR_SIZE_MAX; 428 count = (*pos + count) - XATTR_SIZE_MAX; 429 } 430 431 v_len = ksmbd_vfs_getcasexattr(idmap, 432 fp->filp->f_path.dentry, 433 fp->stream.name, 434 fp->stream.size, 435 &stream_buf); 436 if ((int)v_len < 0) { 437 pr_err("not found stream in xattr : %zd\n", v_len); 438 err = (int)v_len; 439 goto out; 440 } 441 442 if (v_len < size) { 443 wbuf = kvmalloc(size, GFP_KERNEL | __GFP_ZERO); 444 if (!wbuf) { 445 err = -ENOMEM; 446 goto out; 447 } 448 449 if (v_len > 0) 450 memcpy(wbuf, stream_buf, v_len); 451 kvfree(stream_buf); 452 stream_buf = wbuf; 453 } 454 455 memcpy(&stream_buf[*pos], buf, count); 456 457 err = ksmbd_vfs_setxattr(idmap, 458 &fp->filp->f_path, 459 fp->stream.name, 460 (void *)stream_buf, 461 size, 462 0); 463 if (err < 0) 464 goto out; 465 466 fp->filp->f_pos = *pos; 467 err = 0; 468 out: 469 kvfree(stream_buf); 470 return err; 471 } 472 473 /** 474 * ksmbd_vfs_write() - vfs helper for smb file write 475 * @work: work 476 * @fid: file id of open file 477 * @buf: buf containing data for writing 478 * @count: read byte count 479 * @pos: file pos 480 * @sync: fsync after write 481 * @written: number of bytes written 482 * 483 * Return: 0 on success, otherwise error 484 */ 485 int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp, 486 char *buf, size_t count, loff_t *pos, bool sync, 487 ssize_t *written) 488 { 489 struct file *filp; 490 loff_t offset = *pos; 491 int err = 0; 492 493 if (work->conn->connection_type) { 494 if (!(fp->daccess & FILE_WRITE_DATA_LE)) { 495 pr_err("no right to write(%pD)\n", fp->filp); 496 err = -EACCES; 497 goto out; 498 } 499 } 500 501 filp = fp->filp; 502 503 if (ksmbd_stream_fd(fp)) { 504 err = ksmbd_vfs_stream_write(fp, buf, pos, count); 505 if (!err) 506 *written = count; 507 goto out; 508 } 509 510 if (!work->tcon->posix_extensions) { 511 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE); 512 if (err) { 513 pr_err("unable to write due to lock\n"); 514 err = -EAGAIN; 515 goto out; 516 } 517 } 518 519 /* Do we need to break any of a levelII oplock? */ 520 smb_break_all_levII_oplock(work, fp, 1); 521 522 err = kernel_write(filp, buf, count, pos); 523 if (err < 0) { 524 ksmbd_debug(VFS, "smb write failed, err = %d\n", err); 525 goto out; 526 } 527 528 filp->f_pos = *pos; 529 *written = err; 530 err = 0; 531 if (sync) { 532 err = vfs_fsync_range(filp, offset, offset + *written, 0); 533 if (err < 0) 534 pr_err("fsync failed for filename = %pD, err = %d\n", 535 fp->filp, err); 536 } 537 538 out: 539 return err; 540 } 541 542 /** 543 * ksmbd_vfs_getattr() - vfs helper for smb getattr 544 * @work: work 545 * @fid: file id of open file 546 * @attrs: inode attributes 547 * 548 * Return: 0 on success, otherwise error 549 */ 550 int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat) 551 { 552 int err; 553 554 err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT); 555 if (err) 556 pr_err("getattr failed, err %d\n", err); 557 return err; 558 } 559 560 /** 561 * ksmbd_vfs_fsync() - vfs helper for smb fsync 562 * @work: work 563 * @fid: file id of open file 564 * 565 * Return: 0 on success, otherwise error 566 */ 567 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id) 568 { 569 struct ksmbd_file *fp; 570 int err; 571 572 fp = ksmbd_lookup_fd_slow(work, fid, p_id); 573 if (!fp) { 574 pr_err("failed to get filp for fid %llu\n", fid); 575 return -ENOENT; 576 } 577 err = vfs_fsync(fp->filp, 0); 578 if (err < 0) 579 pr_err("smb fsync failed, err = %d\n", err); 580 ksmbd_fd_put(work, fp); 581 return err; 582 } 583 584 /** 585 * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink 586 * @name: directory or file name that is relative to share 587 * 588 * Return: 0 on success, otherwise error 589 */ 590 int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path) 591 { 592 struct mnt_idmap *idmap; 593 struct dentry *parent = path->dentry->d_parent; 594 int err; 595 596 if (ksmbd_override_fsids(work)) 597 return -ENOMEM; 598 599 if (!d_inode(path->dentry)->i_nlink) { 600 err = -ENOENT; 601 goto out_err; 602 } 603 604 err = mnt_want_write(path->mnt); 605 if (err) 606 goto out_err; 607 608 idmap = mnt_idmap(path->mnt); 609 if (S_ISDIR(d_inode(path->dentry)->i_mode)) { 610 err = vfs_rmdir(idmap, d_inode(parent), path->dentry); 611 if (err && err != -ENOTEMPTY) 612 ksmbd_debug(VFS, "rmdir failed, err %d\n", err); 613 } else { 614 err = vfs_unlink(idmap, d_inode(parent), path->dentry, NULL); 615 if (err) 616 ksmbd_debug(VFS, "unlink failed, err %d\n", err); 617 } 618 mnt_drop_write(path->mnt); 619 620 out_err: 621 ksmbd_revert_fsids(work); 622 return err; 623 } 624 625 /** 626 * ksmbd_vfs_link() - vfs helper for creating smb hardlink 627 * @oldname: source file name 628 * @newname: hardlink name that is relative to share 629 * 630 * Return: 0 on success, otherwise error 631 */ 632 int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname, 633 const char *newname) 634 { 635 struct path oldpath, newpath; 636 struct dentry *dentry; 637 int err; 638 639 if (ksmbd_override_fsids(work)) 640 return -ENOMEM; 641 642 err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath); 643 if (err) { 644 pr_err("cannot get linux path for %s, err = %d\n", 645 oldname, err); 646 goto out1; 647 } 648 649 dentry = ksmbd_vfs_kern_path_create(work, newname, 650 LOOKUP_NO_SYMLINKS | LOOKUP_REVAL, 651 &newpath); 652 if (IS_ERR(dentry)) { 653 err = PTR_ERR(dentry); 654 pr_err("path create err for %s, err %d\n", newname, err); 655 goto out2; 656 } 657 658 err = -EXDEV; 659 if (oldpath.mnt != newpath.mnt) { 660 pr_err("vfs_link failed err %d\n", err); 661 goto out3; 662 } 663 664 err = mnt_want_write(newpath.mnt); 665 if (err) 666 goto out3; 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 mnt_drop_write(newpath.mnt); 674 675 out3: 676 done_path_create(&newpath, dentry); 677 out2: 678 path_put(&oldpath); 679 out1: 680 ksmbd_revert_fsids(work); 681 return err; 682 } 683 684 int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path, 685 char *newname, int flags) 686 { 687 struct dentry *old_parent, *new_dentry, *trap; 688 struct dentry *old_child = old_path->dentry; 689 struct path new_path; 690 struct qstr new_last; 691 struct renamedata rd; 692 struct filename *to; 693 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 694 struct ksmbd_file *parent_fp; 695 int new_type; 696 int err, lookup_flags = LOOKUP_NO_SYMLINKS; 697 698 if (ksmbd_override_fsids(work)) 699 return -ENOMEM; 700 701 to = getname_kernel(newname); 702 if (IS_ERR(to)) { 703 err = PTR_ERR(to); 704 goto revert_fsids; 705 } 706 707 retry: 708 err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH, 709 &new_path, &new_last, &new_type, 710 &share_conf->vfs_path); 711 if (err) 712 goto out1; 713 714 if (old_path->mnt != new_path.mnt) { 715 err = -EXDEV; 716 goto out2; 717 } 718 719 err = mnt_want_write(old_path->mnt); 720 if (err) 721 goto out2; 722 723 trap = lock_rename_child(old_child, new_path.dentry); 724 725 old_parent = dget(old_child->d_parent); 726 if (d_unhashed(old_child)) { 727 err = -EINVAL; 728 goto out3; 729 } 730 731 parent_fp = ksmbd_lookup_fd_inode(d_inode(old_child->d_parent)); 732 if (parent_fp) { 733 if (parent_fp->daccess & FILE_DELETE_LE) { 734 pr_err("parent dir is opened with delete access\n"); 735 err = -ESHARE; 736 ksmbd_fd_put(work, parent_fp); 737 goto out3; 738 } 739 ksmbd_fd_put(work, parent_fp); 740 } 741 742 new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry, 743 lookup_flags | LOOKUP_RENAME_TARGET); 744 if (IS_ERR(new_dentry)) { 745 err = PTR_ERR(new_dentry); 746 goto out3; 747 } 748 749 if (d_is_symlink(new_dentry)) { 750 err = -EACCES; 751 goto out4; 752 } 753 754 if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) { 755 err = -EEXIST; 756 goto out4; 757 } 758 759 if (old_child == trap) { 760 err = -EINVAL; 761 goto out4; 762 } 763 764 if (new_dentry == trap) { 765 err = -ENOTEMPTY; 766 goto out4; 767 } 768 769 rd.old_mnt_idmap = mnt_idmap(old_path->mnt), 770 rd.old_dir = d_inode(old_parent), 771 rd.old_dentry = old_child, 772 rd.new_mnt_idmap = mnt_idmap(new_path.mnt), 773 rd.new_dir = new_path.dentry->d_inode, 774 rd.new_dentry = new_dentry, 775 rd.flags = flags, 776 rd.delegated_inode = NULL, 777 err = vfs_rename(&rd); 778 if (err) 779 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err); 780 781 out4: 782 dput(new_dentry); 783 out3: 784 dput(old_parent); 785 unlock_rename(old_parent, new_path.dentry); 786 mnt_drop_write(old_path->mnt); 787 out2: 788 path_put(&new_path); 789 790 if (retry_estale(err, lookup_flags)) { 791 lookup_flags |= LOOKUP_REVAL; 792 goto retry; 793 } 794 out1: 795 putname(to); 796 revert_fsids: 797 ksmbd_revert_fsids(work); 798 return err; 799 } 800 801 /** 802 * ksmbd_vfs_truncate() - vfs helper for smb file truncate 803 * @work: work 804 * @fid: file id of old file 805 * @size: truncate to given size 806 * 807 * Return: 0 on success, otherwise error 808 */ 809 int ksmbd_vfs_truncate(struct ksmbd_work *work, 810 struct ksmbd_file *fp, loff_t size) 811 { 812 int err = 0; 813 struct file *filp; 814 815 filp = fp->filp; 816 817 /* Do we need to break any of a levelII oplock? */ 818 smb_break_all_levII_oplock(work, fp, 1); 819 820 if (!work->tcon->posix_extensions) { 821 struct inode *inode = file_inode(filp); 822 823 if (size < inode->i_size) { 824 err = check_lock_range(filp, size, 825 inode->i_size - 1, WRITE); 826 } else { 827 err = check_lock_range(filp, inode->i_size, 828 size - 1, WRITE); 829 } 830 831 if (err) { 832 pr_err("failed due to lock\n"); 833 return -EAGAIN; 834 } 835 } 836 837 err = vfs_truncate(&filp->f_path, size); 838 if (err) 839 pr_err("truncate failed, err %d\n", err); 840 return err; 841 } 842 843 /** 844 * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes 845 * @dentry: dentry of file for listing xattrs 846 * @list: destination buffer 847 * @size: destination buffer length 848 * 849 * Return: xattr list length on success, otherwise error 850 */ 851 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list) 852 { 853 ssize_t size; 854 char *vlist = NULL; 855 856 size = vfs_listxattr(dentry, NULL, 0); 857 if (size <= 0) 858 return size; 859 860 vlist = kvmalloc(size, GFP_KERNEL | __GFP_ZERO); 861 if (!vlist) 862 return -ENOMEM; 863 864 *list = vlist; 865 size = vfs_listxattr(dentry, vlist, size); 866 if (size < 0) { 867 ksmbd_debug(VFS, "listxattr failed\n"); 868 kvfree(vlist); 869 *list = NULL; 870 } 871 872 return size; 873 } 874 875 static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap, 876 struct dentry *dentry, char *xattr_name) 877 { 878 return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0); 879 } 880 881 /** 882 * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value 883 * @idmap: idmap 884 * @dentry: dentry of file for getting xattrs 885 * @xattr_name: name of xattr name to query 886 * @xattr_buf: destination buffer xattr value 887 * 888 * Return: read xattr value length on success, otherwise error 889 */ 890 ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap, 891 struct dentry *dentry, 892 char *xattr_name, char **xattr_buf) 893 { 894 ssize_t xattr_len; 895 char *buf; 896 897 *xattr_buf = NULL; 898 xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name); 899 if (xattr_len < 0) 900 return xattr_len; 901 902 buf = kmalloc(xattr_len + 1, GFP_KERNEL); 903 if (!buf) 904 return -ENOMEM; 905 906 xattr_len = vfs_getxattr(idmap, dentry, xattr_name, 907 (void *)buf, xattr_len); 908 if (xattr_len > 0) 909 *xattr_buf = buf; 910 else 911 kfree(buf); 912 return xattr_len; 913 } 914 915 /** 916 * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value 917 * @idmap: idmap of the relevant mount 918 * @dentry: dentry to set XATTR at 919 * @attr_name: xattr name for setxattr 920 * @attr_value: xattr value to set 921 * @attr_size: size of xattr value 922 * @flags: destination buffer length 923 * 924 * Return: 0 on success, otherwise error 925 */ 926 int ksmbd_vfs_setxattr(struct mnt_idmap *idmap, 927 const struct path *path, const char *attr_name, 928 void *attr_value, size_t attr_size, int flags) 929 { 930 int err; 931 932 err = mnt_want_write(path->mnt); 933 if (err) 934 return err; 935 936 err = vfs_setxattr(idmap, 937 path->dentry, 938 attr_name, 939 attr_value, 940 attr_size, 941 flags); 942 if (err) 943 ksmbd_debug(VFS, "setxattr failed, err %d\n", err); 944 mnt_drop_write(path->mnt); 945 return err; 946 } 947 948 /** 949 * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options 950 * @filp: file pointer for IO 951 * @options: smb IO options 952 */ 953 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option) 954 { 955 struct address_space *mapping; 956 957 mapping = filp->f_mapping; 958 959 if (!option || !mapping) 960 return; 961 962 if (option & FILE_WRITE_THROUGH_LE) { 963 filp->f_flags |= O_SYNC; 964 } else if (option & FILE_SEQUENTIAL_ONLY_LE) { 965 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2; 966 spin_lock(&filp->f_lock); 967 filp->f_mode &= ~FMODE_RANDOM; 968 spin_unlock(&filp->f_lock); 969 } else if (option & FILE_RANDOM_ACCESS_LE) { 970 spin_lock(&filp->f_lock); 971 filp->f_mode |= FMODE_RANDOM; 972 spin_unlock(&filp->f_lock); 973 } 974 } 975 976 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp, 977 loff_t off, loff_t len) 978 { 979 smb_break_all_levII_oplock(work, fp, 1); 980 if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE) 981 return vfs_fallocate(fp->filp, 982 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 983 off, len); 984 985 return vfs_fallocate(fp->filp, 986 FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE, 987 off, len); 988 } 989 990 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length, 991 struct file_allocated_range_buffer *ranges, 992 unsigned int in_count, unsigned int *out_count) 993 { 994 struct file *f = fp->filp; 995 struct inode *inode = file_inode(fp->filp); 996 loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end; 997 loff_t extent_start, extent_end; 998 int ret = 0; 999 1000 if (start > maxbytes) 1001 return -EFBIG; 1002 1003 if (!in_count) 1004 return 0; 1005 1006 /* 1007 * Shrink request scope to what the fs can actually handle. 1008 */ 1009 if (length > maxbytes || (maxbytes - length) < start) 1010 length = maxbytes - start; 1011 1012 if (start + length > inode->i_size) 1013 length = inode->i_size - start; 1014 1015 *out_count = 0; 1016 end = start + length; 1017 while (start < end && *out_count < in_count) { 1018 extent_start = vfs_llseek(f, start, SEEK_DATA); 1019 if (extent_start < 0) { 1020 if (extent_start != -ENXIO) 1021 ret = (int)extent_start; 1022 break; 1023 } 1024 1025 if (extent_start >= end) 1026 break; 1027 1028 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE); 1029 if (extent_end < 0) { 1030 if (extent_end != -ENXIO) 1031 ret = (int)extent_end; 1032 break; 1033 } else if (extent_start >= extent_end) { 1034 break; 1035 } 1036 1037 ranges[*out_count].file_offset = cpu_to_le64(extent_start); 1038 ranges[(*out_count)++].length = 1039 cpu_to_le64(min(extent_end, end) - extent_start); 1040 1041 start = extent_end; 1042 } 1043 1044 return ret; 1045 } 1046 1047 int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap, 1048 const struct path *path, char *attr_name) 1049 { 1050 int err; 1051 1052 err = mnt_want_write(path->mnt); 1053 if (err) 1054 return err; 1055 1056 err = vfs_removexattr(idmap, path->dentry, attr_name); 1057 mnt_drop_write(path->mnt); 1058 1059 return err; 1060 } 1061 1062 int ksmbd_vfs_unlink(struct file *filp) 1063 { 1064 int err = 0; 1065 struct dentry *dir, *dentry = filp->f_path.dentry; 1066 struct mnt_idmap *idmap = file_mnt_idmap(filp); 1067 1068 err = mnt_want_write(filp->f_path.mnt); 1069 if (err) 1070 return err; 1071 1072 dir = dget_parent(dentry); 1073 err = ksmbd_vfs_lock_parent(dir, dentry); 1074 if (err) 1075 goto out; 1076 dget(dentry); 1077 1078 if (S_ISDIR(d_inode(dentry)->i_mode)) 1079 err = vfs_rmdir(idmap, d_inode(dir), dentry); 1080 else 1081 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL); 1082 1083 dput(dentry); 1084 inode_unlock(d_inode(dir)); 1085 if (err) 1086 ksmbd_debug(VFS, "failed to delete, err %d\n", err); 1087 out: 1088 dput(dir); 1089 mnt_drop_write(filp->f_path.mnt); 1090 1091 return err; 1092 } 1093 1094 static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen, 1095 loff_t offset, u64 ino, unsigned int d_type) 1096 { 1097 struct ksmbd_readdir_data *buf; 1098 1099 buf = container_of(ctx, struct ksmbd_readdir_data, ctx); 1100 buf->dirent_count++; 1101 1102 return buf->dirent_count <= 2; 1103 } 1104 1105 /** 1106 * ksmbd_vfs_empty_dir() - check for empty directory 1107 * @fp: ksmbd file pointer 1108 * 1109 * Return: true if directory empty, otherwise false 1110 */ 1111 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp) 1112 { 1113 int err; 1114 struct ksmbd_readdir_data readdir_data; 1115 1116 memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data)); 1117 1118 set_ctx_actor(&readdir_data.ctx, __dir_empty); 1119 readdir_data.dirent_count = 0; 1120 1121 err = iterate_dir(fp->filp, &readdir_data.ctx); 1122 if (readdir_data.dirent_count > 2) 1123 err = -ENOTEMPTY; 1124 else 1125 err = 0; 1126 return err; 1127 } 1128 1129 static bool __caseless_lookup(struct dir_context *ctx, const char *name, 1130 int namlen, loff_t offset, u64 ino, 1131 unsigned int d_type) 1132 { 1133 struct ksmbd_readdir_data *buf; 1134 int cmp = -EINVAL; 1135 1136 buf = container_of(ctx, struct ksmbd_readdir_data, ctx); 1137 1138 if (buf->used != namlen) 1139 return true; 1140 if (IS_ENABLED(CONFIG_UNICODE) && buf->um) { 1141 const struct qstr q_buf = {.name = buf->private, 1142 .len = buf->used}; 1143 const struct qstr q_name = {.name = name, 1144 .len = namlen}; 1145 1146 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name); 1147 } 1148 if (cmp < 0) 1149 cmp = strncasecmp((char *)buf->private, name, namlen); 1150 if (!cmp) { 1151 memcpy((char *)buf->private, name, namlen); 1152 buf->dirent_count = 1; 1153 return false; 1154 } 1155 return true; 1156 } 1157 1158 /** 1159 * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory 1160 * @dir: path info 1161 * @name: filename to lookup 1162 * @namelen: filename length 1163 * 1164 * Return: 0 on success, otherwise error 1165 */ 1166 static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name, 1167 size_t namelen, struct unicode_map *um) 1168 { 1169 int ret; 1170 struct file *dfilp; 1171 int flags = O_RDONLY | O_LARGEFILE; 1172 struct ksmbd_readdir_data readdir_data = { 1173 .ctx.actor = __caseless_lookup, 1174 .private = name, 1175 .used = namelen, 1176 .dirent_count = 0, 1177 .um = um, 1178 }; 1179 1180 dfilp = dentry_open(dir, flags, current_cred()); 1181 if (IS_ERR(dfilp)) 1182 return PTR_ERR(dfilp); 1183 1184 ret = iterate_dir(dfilp, &readdir_data.ctx); 1185 if (readdir_data.dirent_count > 0) 1186 ret = 0; 1187 fput(dfilp); 1188 return ret; 1189 } 1190 1191 /** 1192 * ksmbd_vfs_kern_path_locked() - lookup a file and get path info 1193 * @name: file path that is relative to share 1194 * @flags: lookup flags 1195 * @path: if lookup succeed, return path info 1196 * @caseless: caseless filename lookup 1197 * 1198 * Return: 0 on success, otherwise error 1199 */ 1200 int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name, 1201 unsigned int flags, struct path *path, 1202 bool caseless) 1203 { 1204 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 1205 int err; 1206 struct path parent_path; 1207 1208 err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, path); 1209 if (!err) 1210 return err; 1211 1212 if (caseless) { 1213 char *filepath; 1214 size_t path_len, remain_len; 1215 1216 filepath = kstrdup(name, GFP_KERNEL); 1217 if (!filepath) 1218 return -ENOMEM; 1219 1220 path_len = strlen(filepath); 1221 remain_len = path_len; 1222 1223 parent_path = share_conf->vfs_path; 1224 path_get(&parent_path); 1225 1226 while (d_can_lookup(parent_path.dentry)) { 1227 char *filename = filepath + path_len - remain_len; 1228 char *next = strchrnul(filename, '/'); 1229 size_t filename_len = next - filename; 1230 bool is_last = !next[0]; 1231 1232 if (filename_len == 0) 1233 break; 1234 1235 err = ksmbd_vfs_lookup_in_dir(&parent_path, filename, 1236 filename_len, 1237 work->conn->um); 1238 if (err) 1239 goto out2; 1240 1241 next[0] = '\0'; 1242 1243 err = vfs_path_lookup(share_conf->vfs_path.dentry, 1244 share_conf->vfs_path.mnt, 1245 filepath, 1246 flags, 1247 path); 1248 if (err) 1249 goto out2; 1250 else if (is_last) 1251 goto out1; 1252 path_put(&parent_path); 1253 parent_path = *path; 1254 1255 next[0] = '/'; 1256 remain_len -= filename_len + 1; 1257 } 1258 1259 err = -EINVAL; 1260 out2: 1261 path_put(&parent_path); 1262 out1: 1263 kfree(filepath); 1264 } 1265 1266 if (!err) { 1267 err = ksmbd_vfs_lock_parent(parent_path.dentry, path->dentry); 1268 if (err) 1269 dput(path->dentry); 1270 path_put(&parent_path); 1271 } 1272 return err; 1273 } 1274 1275 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work, 1276 const char *name, 1277 unsigned int flags, 1278 struct path *path) 1279 { 1280 char *abs_name; 1281 struct dentry *dent; 1282 1283 abs_name = convert_to_unix_name(work->tcon->share_conf, name); 1284 if (!abs_name) 1285 return ERR_PTR(-ENOMEM); 1286 1287 dent = kern_path_create(AT_FDCWD, abs_name, path, flags); 1288 kfree(abs_name); 1289 return dent; 1290 } 1291 1292 int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap, 1293 const struct path *path) 1294 { 1295 char *name, *xattr_list = NULL; 1296 ssize_t xattr_list_len; 1297 int err = 0; 1298 1299 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list); 1300 if (xattr_list_len < 0) { 1301 goto out; 1302 } else if (!xattr_list_len) { 1303 ksmbd_debug(SMB, "empty xattr in the file\n"); 1304 goto out; 1305 } 1306 1307 err = mnt_want_write(path->mnt); 1308 if (err) 1309 goto out; 1310 1311 for (name = xattr_list; name - xattr_list < xattr_list_len; 1312 name += strlen(name) + 1) { 1313 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name)); 1314 1315 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS, 1316 sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) || 1317 !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT, 1318 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) { 1319 err = vfs_remove_acl(idmap, path->dentry, name); 1320 if (err) 1321 ksmbd_debug(SMB, 1322 "remove acl xattr failed : %s\n", name); 1323 } 1324 } 1325 mnt_drop_write(path->mnt); 1326 1327 out: 1328 kvfree(xattr_list); 1329 return err; 1330 } 1331 1332 int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path) 1333 { 1334 char *name, *xattr_list = NULL; 1335 ssize_t xattr_list_len; 1336 int err = 0; 1337 1338 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list); 1339 if (xattr_list_len < 0) { 1340 goto out; 1341 } else if (!xattr_list_len) { 1342 ksmbd_debug(SMB, "empty xattr in the file\n"); 1343 goto out; 1344 } 1345 1346 for (name = xattr_list; name - xattr_list < xattr_list_len; 1347 name += strlen(name) + 1) { 1348 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name)); 1349 1350 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) { 1351 err = ksmbd_vfs_remove_xattr(idmap, path, name); 1352 if (err) 1353 ksmbd_debug(SMB, "remove xattr failed : %s\n", name); 1354 } 1355 } 1356 out: 1357 kvfree(xattr_list); 1358 return err; 1359 } 1360 1361 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap, 1362 struct inode *inode, 1363 int acl_type) 1364 { 1365 struct xattr_smb_acl *smb_acl = NULL; 1366 struct posix_acl *posix_acls; 1367 struct posix_acl_entry *pa_entry; 1368 struct xattr_acl_entry *xa_entry; 1369 int i; 1370 1371 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1372 return NULL; 1373 1374 posix_acls = get_inode_acl(inode, acl_type); 1375 if (IS_ERR_OR_NULL(posix_acls)) 1376 return NULL; 1377 1378 smb_acl = kzalloc(sizeof(struct xattr_smb_acl) + 1379 sizeof(struct xattr_acl_entry) * posix_acls->a_count, 1380 GFP_KERNEL); 1381 if (!smb_acl) 1382 goto out; 1383 1384 smb_acl->count = posix_acls->a_count; 1385 pa_entry = posix_acls->a_entries; 1386 xa_entry = smb_acl->entries; 1387 for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) { 1388 switch (pa_entry->e_tag) { 1389 case ACL_USER: 1390 xa_entry->type = SMB_ACL_USER; 1391 xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry); 1392 break; 1393 case ACL_USER_OBJ: 1394 xa_entry->type = SMB_ACL_USER_OBJ; 1395 break; 1396 case ACL_GROUP: 1397 xa_entry->type = SMB_ACL_GROUP; 1398 xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry); 1399 break; 1400 case ACL_GROUP_OBJ: 1401 xa_entry->type = SMB_ACL_GROUP_OBJ; 1402 break; 1403 case ACL_OTHER: 1404 xa_entry->type = SMB_ACL_OTHER; 1405 break; 1406 case ACL_MASK: 1407 xa_entry->type = SMB_ACL_MASK; 1408 break; 1409 default: 1410 pr_err("unknown type : 0x%x\n", pa_entry->e_tag); 1411 goto out; 1412 } 1413 1414 if (pa_entry->e_perm & ACL_READ) 1415 xa_entry->perm |= SMB_ACL_READ; 1416 if (pa_entry->e_perm & ACL_WRITE) 1417 xa_entry->perm |= SMB_ACL_WRITE; 1418 if (pa_entry->e_perm & ACL_EXECUTE) 1419 xa_entry->perm |= SMB_ACL_EXECUTE; 1420 } 1421 out: 1422 posix_acl_release(posix_acls); 1423 return smb_acl; 1424 } 1425 1426 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn, 1427 struct mnt_idmap *idmap, 1428 const struct path *path, 1429 struct smb_ntsd *pntsd, int len) 1430 { 1431 int rc; 1432 struct ndr sd_ndr = {0}, acl_ndr = {0}; 1433 struct xattr_ntacl acl = {0}; 1434 struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL; 1435 struct dentry *dentry = path->dentry; 1436 struct inode *inode = d_inode(dentry); 1437 1438 acl.version = 4; 1439 acl.hash_type = XATTR_SD_HASH_TYPE_SHA256; 1440 acl.current_time = ksmbd_UnixTimeToNT(current_time(inode)); 1441 1442 memcpy(acl.desc, "posix_acl", 9); 1443 acl.desc_len = 10; 1444 1445 pntsd->osidoffset = 1446 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF); 1447 pntsd->gsidoffset = 1448 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF); 1449 pntsd->dacloffset = 1450 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF); 1451 1452 acl.sd_buf = (char *)pntsd; 1453 acl.sd_size = len; 1454 1455 rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash); 1456 if (rc) { 1457 pr_err("failed to generate hash for ndr acl\n"); 1458 return rc; 1459 } 1460 1461 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1462 ACL_TYPE_ACCESS); 1463 if (S_ISDIR(inode->i_mode)) 1464 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1465 ACL_TYPE_DEFAULT); 1466 1467 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, 1468 smb_acl, def_smb_acl); 1469 if (rc) { 1470 pr_err("failed to encode ndr to posix acl\n"); 1471 goto out; 1472 } 1473 1474 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, 1475 acl.posix_acl_hash); 1476 if (rc) { 1477 pr_err("failed to generate hash for ndr acl\n"); 1478 goto out; 1479 } 1480 1481 rc = ndr_encode_v4_ntacl(&sd_ndr, &acl); 1482 if (rc) { 1483 pr_err("failed to encode ndr to posix acl\n"); 1484 goto out; 1485 } 1486 1487 rc = ksmbd_vfs_setxattr(idmap, path, 1488 XATTR_NAME_SD, sd_ndr.data, 1489 sd_ndr.offset, 0); 1490 if (rc < 0) 1491 pr_err("Failed to store XATTR ntacl :%d\n", rc); 1492 1493 kfree(sd_ndr.data); 1494 out: 1495 kfree(acl_ndr.data); 1496 kfree(smb_acl); 1497 kfree(def_smb_acl); 1498 return rc; 1499 } 1500 1501 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn, 1502 struct mnt_idmap *idmap, 1503 struct dentry *dentry, 1504 struct smb_ntsd **pntsd) 1505 { 1506 int rc; 1507 struct ndr n; 1508 struct inode *inode = d_inode(dentry); 1509 struct ndr acl_ndr = {0}; 1510 struct xattr_ntacl acl; 1511 struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL; 1512 __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0}; 1513 1514 rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data); 1515 if (rc <= 0) 1516 return rc; 1517 1518 n.length = rc; 1519 rc = ndr_decode_v4_ntacl(&n, &acl); 1520 if (rc) 1521 goto free_n_data; 1522 1523 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1524 ACL_TYPE_ACCESS); 1525 if (S_ISDIR(inode->i_mode)) 1526 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1527 ACL_TYPE_DEFAULT); 1528 1529 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl, 1530 def_smb_acl); 1531 if (rc) { 1532 pr_err("failed to encode ndr to posix acl\n"); 1533 goto out_free; 1534 } 1535 1536 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash); 1537 if (rc) { 1538 pr_err("failed to generate hash for ndr acl\n"); 1539 goto out_free; 1540 } 1541 1542 if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) { 1543 pr_err("hash value diff\n"); 1544 rc = -EINVAL; 1545 goto out_free; 1546 } 1547 1548 *pntsd = acl.sd_buf; 1549 if (acl.sd_size < sizeof(struct smb_ntsd)) { 1550 pr_err("sd size is invalid\n"); 1551 goto out_free; 1552 } 1553 1554 (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) - 1555 NDR_NTSD_OFFSETOF); 1556 (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) - 1557 NDR_NTSD_OFFSETOF); 1558 (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) - 1559 NDR_NTSD_OFFSETOF); 1560 1561 rc = acl.sd_size; 1562 out_free: 1563 kfree(acl_ndr.data); 1564 kfree(smb_acl); 1565 kfree(def_smb_acl); 1566 if (rc < 0) { 1567 kfree(acl.sd_buf); 1568 *pntsd = NULL; 1569 } 1570 1571 free_n_data: 1572 kfree(n.data); 1573 return rc; 1574 } 1575 1576 int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap, 1577 const struct path *path, 1578 struct xattr_dos_attrib *da) 1579 { 1580 struct ndr n; 1581 int err; 1582 1583 err = ndr_encode_dos_attr(&n, da); 1584 if (err) 1585 return err; 1586 1587 err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE, 1588 (void *)n.data, n.offset, 0); 1589 if (err) 1590 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n"); 1591 kfree(n.data); 1592 1593 return err; 1594 } 1595 1596 int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap, 1597 struct dentry *dentry, 1598 struct xattr_dos_attrib *da) 1599 { 1600 struct ndr n; 1601 int err; 1602 1603 err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE, 1604 (char **)&n.data); 1605 if (err > 0) { 1606 n.length = err; 1607 if (ndr_decode_dos_attr(&n, da)) 1608 err = -EINVAL; 1609 kfree(n.data); 1610 } else { 1611 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n"); 1612 } 1613 1614 return err; 1615 } 1616 1617 /** 1618 * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format 1619 * @p: destination buffer 1620 * @ksmbd_kstat: ksmbd kstat wrapper 1621 */ 1622 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat) 1623 { 1624 struct file_directory_info *info = (struct file_directory_info *)(*p); 1625 struct kstat *kstat = ksmbd_kstat->kstat; 1626 u64 time; 1627 1628 info->FileIndex = 0; 1629 info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time); 1630 time = ksmbd_UnixTimeToNT(kstat->atime); 1631 info->LastAccessTime = cpu_to_le64(time); 1632 time = ksmbd_UnixTimeToNT(kstat->mtime); 1633 info->LastWriteTime = cpu_to_le64(time); 1634 time = ksmbd_UnixTimeToNT(kstat->ctime); 1635 info->ChangeTime = cpu_to_le64(time); 1636 1637 if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) { 1638 info->EndOfFile = 0; 1639 info->AllocationSize = 0; 1640 } else { 1641 info->EndOfFile = cpu_to_le64(kstat->size); 1642 info->AllocationSize = cpu_to_le64(kstat->blocks << 9); 1643 } 1644 info->ExtFileAttributes = ksmbd_kstat->file_attributes; 1645 1646 return info; 1647 } 1648 1649 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work, 1650 struct mnt_idmap *idmap, 1651 struct dentry *dentry, 1652 struct ksmbd_kstat *ksmbd_kstat) 1653 { 1654 u64 time; 1655 int rc; 1656 1657 generic_fillattr(idmap, d_inode(dentry), ksmbd_kstat->kstat); 1658 1659 time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime); 1660 ksmbd_kstat->create_time = time; 1661 1662 /* 1663 * set default value for the case that store dos attributes is not yes 1664 * or that acl is disable in server's filesystem and the config is yes. 1665 */ 1666 if (S_ISDIR(ksmbd_kstat->kstat->mode)) 1667 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE; 1668 else 1669 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE; 1670 1671 if (test_share_config_flag(work->tcon->share_conf, 1672 KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) { 1673 struct xattr_dos_attrib da; 1674 1675 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da); 1676 if (rc > 0) { 1677 ksmbd_kstat->file_attributes = cpu_to_le32(da.attr); 1678 ksmbd_kstat->create_time = da.create_time; 1679 } else { 1680 ksmbd_debug(VFS, "fail to load dos attribute.\n"); 1681 } 1682 } 1683 1684 return 0; 1685 } 1686 1687 ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap, 1688 struct dentry *dentry, char *attr_name, 1689 int attr_name_len) 1690 { 1691 char *name, *xattr_list = NULL; 1692 ssize_t value_len = -ENOENT, xattr_list_len; 1693 1694 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list); 1695 if (xattr_list_len <= 0) 1696 goto out; 1697 1698 for (name = xattr_list; name - xattr_list < xattr_list_len; 1699 name += strlen(name) + 1) { 1700 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name)); 1701 if (strncasecmp(attr_name, name, attr_name_len)) 1702 continue; 1703 1704 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name); 1705 break; 1706 } 1707 1708 out: 1709 kvfree(xattr_list); 1710 return value_len; 1711 } 1712 1713 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name, 1714 size_t *xattr_stream_name_size, int s_type) 1715 { 1716 char *type, *buf; 1717 1718 if (s_type == DIR_STREAM) 1719 type = ":$INDEX_ALLOCATION"; 1720 else 1721 type = ":$DATA"; 1722 1723 buf = kasprintf(GFP_KERNEL, "%s%s%s", 1724 XATTR_NAME_STREAM, stream_name, type); 1725 if (!buf) 1726 return -ENOMEM; 1727 1728 *xattr_stream_name = buf; 1729 *xattr_stream_name_size = strlen(buf) + 1; 1730 1731 return 0; 1732 } 1733 1734 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work, 1735 struct ksmbd_file *src_fp, 1736 struct ksmbd_file *dst_fp, 1737 struct srv_copychunk *chunks, 1738 unsigned int chunk_count, 1739 unsigned int *chunk_count_written, 1740 unsigned int *chunk_size_written, 1741 loff_t *total_size_written) 1742 { 1743 unsigned int i; 1744 loff_t src_off, dst_off, src_file_size; 1745 size_t len; 1746 int ret; 1747 1748 *chunk_count_written = 0; 1749 *chunk_size_written = 0; 1750 *total_size_written = 0; 1751 1752 if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) { 1753 pr_err("no right to read(%pD)\n", src_fp->filp); 1754 return -EACCES; 1755 } 1756 if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) { 1757 pr_err("no right to write(%pD)\n", dst_fp->filp); 1758 return -EACCES; 1759 } 1760 1761 if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp)) 1762 return -EBADF; 1763 1764 smb_break_all_levII_oplock(work, dst_fp, 1); 1765 1766 if (!work->tcon->posix_extensions) { 1767 for (i = 0; i < chunk_count; i++) { 1768 src_off = le64_to_cpu(chunks[i].SourceOffset); 1769 dst_off = le64_to_cpu(chunks[i].TargetOffset); 1770 len = le32_to_cpu(chunks[i].Length); 1771 1772 if (check_lock_range(src_fp->filp, src_off, 1773 src_off + len - 1, READ)) 1774 return -EAGAIN; 1775 if (check_lock_range(dst_fp->filp, dst_off, 1776 dst_off + len - 1, WRITE)) 1777 return -EAGAIN; 1778 } 1779 } 1780 1781 src_file_size = i_size_read(file_inode(src_fp->filp)); 1782 1783 for (i = 0; i < chunk_count; i++) { 1784 src_off = le64_to_cpu(chunks[i].SourceOffset); 1785 dst_off = le64_to_cpu(chunks[i].TargetOffset); 1786 len = le32_to_cpu(chunks[i].Length); 1787 1788 if (src_off + len > src_file_size) 1789 return -E2BIG; 1790 1791 ret = vfs_copy_file_range(src_fp->filp, src_off, 1792 dst_fp->filp, dst_off, len, 0); 1793 if (ret == -EOPNOTSUPP || ret == -EXDEV) 1794 ret = vfs_copy_file_range(src_fp->filp, src_off, 1795 dst_fp->filp, dst_off, len, 1796 COPY_FILE_SPLICE); 1797 if (ret < 0) 1798 return ret; 1799 1800 *chunk_count_written += 1; 1801 *total_size_written += ret; 1802 } 1803 return 0; 1804 } 1805 1806 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock) 1807 { 1808 wait_event(flock->fl_wait, !flock->fl_blocker); 1809 } 1810 1811 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout) 1812 { 1813 return wait_event_interruptible_timeout(flock->fl_wait, 1814 !flock->fl_blocker, 1815 timeout); 1816 } 1817 1818 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock) 1819 { 1820 locks_delete_block(flock); 1821 } 1822 1823 int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap, 1824 struct path *path) 1825 { 1826 struct posix_acl_state acl_state; 1827 struct posix_acl *acls; 1828 struct dentry *dentry = path->dentry; 1829 struct inode *inode = d_inode(dentry); 1830 int rc; 1831 1832 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1833 return -EOPNOTSUPP; 1834 1835 ksmbd_debug(SMB, "Set posix acls\n"); 1836 rc = init_acl_state(&acl_state, 1); 1837 if (rc) 1838 return rc; 1839 1840 /* Set default owner group */ 1841 acl_state.owner.allow = (inode->i_mode & 0700) >> 6; 1842 acl_state.group.allow = (inode->i_mode & 0070) >> 3; 1843 acl_state.other.allow = inode->i_mode & 0007; 1844 acl_state.users->aces[acl_state.users->n].uid = inode->i_uid; 1845 acl_state.users->aces[acl_state.users->n++].perms.allow = 1846 acl_state.owner.allow; 1847 acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid; 1848 acl_state.groups->aces[acl_state.groups->n++].perms.allow = 1849 acl_state.group.allow; 1850 acl_state.mask.allow = 0x07; 1851 1852 acls = posix_acl_alloc(6, GFP_KERNEL); 1853 if (!acls) { 1854 free_acl_state(&acl_state); 1855 return -ENOMEM; 1856 } 1857 posix_state_to_acl(&acl_state, acls->a_entries); 1858 1859 rc = mnt_want_write(path->mnt); 1860 if (rc) 1861 goto out_err; 1862 1863 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls); 1864 if (rc < 0) 1865 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", 1866 rc); 1867 else if (S_ISDIR(inode->i_mode)) { 1868 posix_state_to_acl(&acl_state, acls->a_entries); 1869 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls); 1870 if (rc < 0) 1871 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", 1872 rc); 1873 } 1874 mnt_drop_write(path->mnt); 1875 1876 out_err: 1877 free_acl_state(&acl_state); 1878 posix_acl_release(acls); 1879 return rc; 1880 } 1881 1882 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap, 1883 struct path *path, struct inode *parent_inode) 1884 { 1885 struct posix_acl *acls; 1886 struct posix_acl_entry *pace; 1887 struct dentry *dentry = path->dentry; 1888 struct inode *inode = d_inode(dentry); 1889 int rc, i; 1890 1891 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1892 return -EOPNOTSUPP; 1893 1894 acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT); 1895 if (IS_ERR_OR_NULL(acls)) 1896 return -ENOENT; 1897 pace = acls->a_entries; 1898 1899 for (i = 0; i < acls->a_count; i++, pace++) { 1900 if (pace->e_tag == ACL_MASK) { 1901 pace->e_perm = 0x07; 1902 break; 1903 } 1904 } 1905 1906 rc = mnt_want_write(path->mnt); 1907 if (rc) 1908 goto out_err; 1909 1910 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls); 1911 if (rc < 0) 1912 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", 1913 rc); 1914 if (S_ISDIR(inode->i_mode)) { 1915 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, 1916 acls); 1917 if (rc < 0) 1918 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", 1919 rc); 1920 } 1921 mnt_drop_write(path->mnt); 1922 1923 out_err: 1924 posix_acl_release(acls); 1925 return rc; 1926 } 1927