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 39static 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 */ 53int 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 64static 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 err = mnt_want_write(parent_path->mnt); 101 if (err) { 102 path_put(parent_path); 103 putname(filename); 104 return -ENOENT; 105 } 106 107 inode_lock_nested(parent_path->dentry->d_inode, I_MUTEX_PARENT); 108 d = lookup_one_qstr_excl(&last, parent_path->dentry, 0); 109 if (IS_ERR(d)) 110 goto err_out; 111 112 if (d_is_negative(d)) { 113 dput(d); 114 goto err_out; 115 } 116 117 path->dentry = d; 118 path->mnt = mntget(parent_path->mnt); 119 120 if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) { 121 err = follow_down(path, 0); 122 if (err < 0) { 123 path_put(path); 124 goto err_out; 125 } 126 } 127 128 putname(filename); 129 return 0; 130 131err_out: 132 inode_unlock(d_inode(parent_path->dentry)); 133 mnt_drop_write(parent_path->mnt); 134 path_put(parent_path); 135 putname(filename); 136 return -ENOENT; 137} 138 139void ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap, 140 struct dentry *dentry, __le32 *daccess) 141{ 142 *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL); 143 144 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE)) 145 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE | 146 FILE_WRITE_DATA | FILE_APPEND_DATA | 147 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES | 148 FILE_DELETE_CHILD); 149 150 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ)) 151 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE; 152 153 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC)) 154 *daccess |= FILE_EXECUTE_LE; 155 156 if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE)) 157 *daccess |= FILE_DELETE_LE; 158} 159 160/** 161 * ksmbd_vfs_create() - vfs helper for smb create file 162 * @work: work 163 * @name: file name that is relative to share 164 * @mode: file create mode 165 * 166 * Return: 0 on success, otherwise error 167 */ 168int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode) 169{ 170 struct path path; 171 struct dentry *dentry; 172 int err; 173 174 dentry = ksmbd_vfs_kern_path_create(work, name, 175 LOOKUP_NO_SYMLINKS, &path); 176 if (IS_ERR(dentry)) { 177 err = PTR_ERR(dentry); 178 if (err != -ENOENT) 179 pr_err("path create failed for %s, err %d\n", 180 name, err); 181 return err; 182 } 183 184 mode |= S_IFREG; 185 err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry), 186 dentry, mode, true); 187 if (!err) { 188 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), 189 d_inode(dentry)); 190 } else { 191 pr_err("File(%s): creation failed (err:%d)\n", name, err); 192 } 193 194 done_path_create(&path, dentry); 195 return err; 196} 197 198/** 199 * ksmbd_vfs_mkdir() - vfs helper for smb create directory 200 * @work: work 201 * @name: directory name that is relative to share 202 * @mode: directory create mode 203 * 204 * Return: 0 on success, otherwise error 205 */ 206int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode) 207{ 208 struct mnt_idmap *idmap; 209 struct path path; 210 struct dentry *dentry; 211 int err; 212 213 dentry = ksmbd_vfs_kern_path_create(work, name, 214 LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY, 215 &path); 216 if (IS_ERR(dentry)) { 217 err = PTR_ERR(dentry); 218 if (err != -EEXIST) 219 ksmbd_debug(VFS, "path create failed for %s, err %d\n", 220 name, err); 221 return err; 222 } 223 224 idmap = mnt_idmap(path.mnt); 225 mode |= S_IFDIR; 226 err = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode); 227 if (!err && d_unhashed(dentry)) { 228 struct dentry *d; 229 230 d = lookup_one(idmap, dentry->d_name.name, dentry->d_parent, 231 dentry->d_name.len); 232 if (IS_ERR(d)) { 233 err = PTR_ERR(d); 234 goto out_err; 235 } 236 if (unlikely(d_is_negative(d))) { 237 dput(d); 238 err = -ENOENT; 239 goto out_err; 240 } 241 242 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d)); 243 dput(d); 244 } 245 246out_err: 247 done_path_create(&path, dentry); 248 if (err) 249 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err); 250 return err; 251} 252 253static ssize_t ksmbd_vfs_getcasexattr(struct mnt_idmap *idmap, 254 struct dentry *dentry, char *attr_name, 255 int attr_name_len, char **attr_value) 256{ 257 char *name, *xattr_list = NULL; 258 ssize_t value_len = -ENOENT, xattr_list_len; 259 260 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list); 261 if (xattr_list_len <= 0) 262 goto out; 263 264 for (name = xattr_list; name - xattr_list < xattr_list_len; 265 name += strlen(name) + 1) { 266 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name)); 267 if (strncasecmp(attr_name, name, attr_name_len)) 268 continue; 269 270 value_len = ksmbd_vfs_getxattr(idmap, 271 dentry, 272 name, 273 attr_value); 274 if (value_len < 0) 275 pr_err("failed to get xattr in file\n"); 276 break; 277 } 278 279out: 280 kvfree(xattr_list); 281 return value_len; 282} 283 284static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos, 285 size_t count) 286{ 287 ssize_t v_len; 288 char *stream_buf = NULL; 289 290 ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n", 291 *pos, count); 292 293 v_len = ksmbd_vfs_getcasexattr(file_mnt_idmap(fp->filp), 294 fp->filp->f_path.dentry, 295 fp->stream.name, 296 fp->stream.size, 297 &stream_buf); 298 if ((int)v_len <= 0) 299 return (int)v_len; 300 301 if (v_len <= *pos) { 302 count = -EINVAL; 303 goto free_buf; 304 } 305 306 if (v_len - *pos < count) 307 count = v_len - *pos; 308 309 memcpy(buf, &stream_buf[*pos], count); 310 311free_buf: 312 kvfree(stream_buf); 313 return count; 314} 315 316/** 317 * check_lock_range() - vfs helper for smb byte range file locking 318 * @filp: the file to apply the lock to 319 * @start: lock start byte offset 320 * @end: lock end byte offset 321 * @type: byte range type read/write 322 * 323 * Return: 0 on success, otherwise error 324 */ 325static int check_lock_range(struct file *filp, loff_t start, loff_t end, 326 unsigned char type) 327{ 328 struct file_lock *flock; 329 struct file_lock_context *ctx = locks_inode_context(file_inode(filp)); 330 int error = 0; 331 332 if (!ctx || list_empty_careful(&ctx->flc_posix)) 333 return 0; 334 335 spin_lock(&ctx->flc_lock); 336 list_for_each_entry(flock, &ctx->flc_posix, fl_list) { 337 /* check conflict locks */ 338 if (flock->fl_end >= start && end >= flock->fl_start) { 339 if (flock->fl_type == F_RDLCK) { 340 if (type == WRITE) { 341 pr_err("not allow write by shared lock\n"); 342 error = 1; 343 goto out; 344 } 345 } else if (flock->fl_type == F_WRLCK) { 346 /* check owner in lock */ 347 if (flock->fl_file != filp) { 348 error = 1; 349 pr_err("not allow rw access by exclusive lock from other opens\n"); 350 goto out; 351 } 352 } 353 } 354 } 355out: 356 spin_unlock(&ctx->flc_lock); 357 return error; 358} 359 360/** 361 * ksmbd_vfs_read() - vfs helper for smb file read 362 * @work: smb work 363 * @fid: file id of open file 364 * @count: read byte count 365 * @pos: file pos 366 * @rbuf: read data buffer 367 * 368 * Return: number of read bytes on success, otherwise error 369 */ 370int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count, 371 loff_t *pos, char *rbuf) 372{ 373 struct file *filp = fp->filp; 374 ssize_t nbytes = 0; 375 struct inode *inode = file_inode(filp); 376 377 if (S_ISDIR(inode->i_mode)) 378 return -EISDIR; 379 380 if (unlikely(count == 0)) 381 return 0; 382 383 if (work->conn->connection_type) { 384 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) { 385 pr_err("no right to read(%pD)\n", fp->filp); 386 return -EACCES; 387 } 388 } 389 390 if (ksmbd_stream_fd(fp)) 391 return ksmbd_vfs_stream_read(fp, rbuf, pos, count); 392 393 if (!work->tcon->posix_extensions) { 394 int ret; 395 396 ret = check_lock_range(filp, *pos, *pos + count - 1, READ); 397 if (ret) { 398 pr_err("unable to read due to lock\n"); 399 return -EAGAIN; 400 } 401 } 402 403 nbytes = kernel_read(filp, rbuf, count, pos); 404 if (nbytes < 0) { 405 pr_err("smb read failed, err = %zd\n", nbytes); 406 return nbytes; 407 } 408 409 filp->f_pos = *pos; 410 return nbytes; 411} 412 413static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos, 414 size_t count) 415{ 416 char *stream_buf = NULL, *wbuf; 417 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp); 418 size_t size; 419 ssize_t 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 (v_len < 0) { 437 pr_err("not found stream in xattr : %zd\n", v_len); 438 err = v_len; 439 goto out; 440 } 441 442 if (v_len < size) { 443 wbuf = kvzalloc(size, GFP_KERNEL); 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 true); 464 if (err < 0) 465 goto out; 466 467 fp->filp->f_pos = *pos; 468 err = 0; 469out: 470 kvfree(stream_buf); 471 return err; 472} 473 474/** 475 * ksmbd_vfs_write() - vfs helper for smb file write 476 * @work: work 477 * @fid: file id of open file 478 * @buf: buf containing data for writing 479 * @count: read byte count 480 * @pos: file pos 481 * @sync: fsync after write 482 * @written: number of bytes written 483 * 484 * Return: 0 on success, otherwise error 485 */ 486int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp, 487 char *buf, size_t count, loff_t *pos, bool sync, 488 ssize_t *written) 489{ 490 struct file *filp; 491 loff_t offset = *pos; 492 int err = 0; 493 494 if (work->conn->connection_type) { 495 if (!(fp->daccess & FILE_WRITE_DATA_LE)) { 496 pr_err("no right to write(%pD)\n", fp->filp); 497 err = -EACCES; 498 goto out; 499 } 500 } 501 502 filp = fp->filp; 503 504 if (ksmbd_stream_fd(fp)) { 505 err = ksmbd_vfs_stream_write(fp, buf, pos, count); 506 if (!err) 507 *written = count; 508 goto out; 509 } 510 511 if (!work->tcon->posix_extensions) { 512 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE); 513 if (err) { 514 pr_err("unable to write due to lock\n"); 515 err = -EAGAIN; 516 goto out; 517 } 518 } 519 520 /* Reserve lease break for parent dir at closing time */ 521 fp->reserve_lease_break = true; 522 523 /* Do we need to break any of a levelII oplock? */ 524 smb_break_all_levII_oplock(work, fp, 1); 525 526 err = kernel_write(filp, buf, count, pos); 527 if (err < 0) { 528 ksmbd_debug(VFS, "smb write failed, err = %d\n", err); 529 goto out; 530 } 531 532 filp->f_pos = *pos; 533 *written = err; 534 err = 0; 535 if (sync) { 536 err = vfs_fsync_range(filp, offset, offset + *written, 0); 537 if (err < 0) 538 pr_err("fsync failed for filename = %pD, err = %d\n", 539 fp->filp, err); 540 } 541 542out: 543 return err; 544} 545 546/** 547 * ksmbd_vfs_getattr() - vfs helper for smb getattr 548 * @work: work 549 * @fid: file id of open file 550 * @attrs: inode attributes 551 * 552 * Return: 0 on success, otherwise error 553 */ 554int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat) 555{ 556 int err; 557 558 err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT); 559 if (err) 560 pr_err("getattr failed, err %d\n", err); 561 return err; 562} 563 564/** 565 * ksmbd_vfs_fsync() - vfs helper for smb fsync 566 * @work: work 567 * @fid: file id of open file 568 * 569 * Return: 0 on success, otherwise error 570 */ 571int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id) 572{ 573 struct ksmbd_file *fp; 574 int err; 575 576 fp = ksmbd_lookup_fd_slow(work, fid, p_id); 577 if (!fp) { 578 pr_err("failed to get filp for fid %llu\n", fid); 579 return -ENOENT; 580 } 581 err = vfs_fsync(fp->filp, 0); 582 if (err < 0) 583 pr_err("smb fsync failed, err = %d\n", err); 584 ksmbd_fd_put(work, fp); 585 return err; 586} 587 588/** 589 * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink 590 * @name: directory or file name that is relative to share 591 * 592 * Return: 0 on success, otherwise error 593 */ 594int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path) 595{ 596 struct mnt_idmap *idmap; 597 struct dentry *parent = path->dentry->d_parent; 598 int err; 599 600 if (ksmbd_override_fsids(work)) 601 return -ENOMEM; 602 603 if (!d_inode(path->dentry)->i_nlink) { 604 err = -ENOENT; 605 goto out_err; 606 } 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 619out_err: 620 ksmbd_revert_fsids(work); 621 return err; 622} 623 624/** 625 * ksmbd_vfs_link() - vfs helper for creating smb hardlink 626 * @oldname: source file name 627 * @newname: hardlink name that is relative to share 628 * 629 * Return: 0 on success, otherwise error 630 */ 631int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname, 632 const char *newname) 633{ 634 struct path oldpath, newpath; 635 struct dentry *dentry; 636 int err; 637 638 if (ksmbd_override_fsids(work)) 639 return -ENOMEM; 640 641 err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath); 642 if (err) { 643 pr_err("cannot get linux path for %s, err = %d\n", 644 oldname, err); 645 goto out1; 646 } 647 648 dentry = ksmbd_vfs_kern_path_create(work, newname, 649 LOOKUP_NO_SYMLINKS | LOOKUP_REVAL, 650 &newpath); 651 if (IS_ERR(dentry)) { 652 err = PTR_ERR(dentry); 653 pr_err("path create err for %s, err %d\n", newname, err); 654 goto out2; 655 } 656 657 err = -EXDEV; 658 if (oldpath.mnt != newpath.mnt) { 659 pr_err("vfs_link failed err %d\n", err); 660 goto out3; 661 } 662 663 err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt), 664 d_inode(newpath.dentry), 665 dentry, NULL); 666 if (err) 667 ksmbd_debug(VFS, "vfs_link failed err %d\n", err); 668 669out3: 670 done_path_create(&newpath, dentry); 671out2: 672 path_put(&oldpath); 673out1: 674 ksmbd_revert_fsids(work); 675 return err; 676} 677 678int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path, 679 char *newname, int flags) 680{ 681 struct dentry *old_parent, *new_dentry, *trap; 682 struct dentry *old_child = old_path->dentry; 683 struct path new_path; 684 struct qstr new_last; 685 struct renamedata rd; 686 struct filename *to; 687 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 688 struct ksmbd_file *parent_fp; 689 int new_type; 690 int err, lookup_flags = LOOKUP_NO_SYMLINKS; 691 692 if (ksmbd_override_fsids(work)) 693 return -ENOMEM; 694 695 to = getname_kernel(newname); 696 if (IS_ERR(to)) { 697 err = PTR_ERR(to); 698 goto revert_fsids; 699 } 700 701retry: 702 err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH, 703 &new_path, &new_last, &new_type, 704 &share_conf->vfs_path); 705 if (err) 706 goto out1; 707 708 if (old_path->mnt != new_path.mnt) { 709 err = -EXDEV; 710 goto out2; 711 } 712 713 err = mnt_want_write(old_path->mnt); 714 if (err) 715 goto out2; 716 717 trap = lock_rename_child(old_child, new_path.dentry); 718 719 old_parent = dget(old_child->d_parent); 720 if (d_unhashed(old_child)) { 721 err = -EINVAL; 722 goto out3; 723 } 724 725 parent_fp = ksmbd_lookup_fd_inode(old_child->d_parent); 726 if (parent_fp) { 727 if (parent_fp->daccess & FILE_DELETE_LE) { 728 pr_err("parent dir is opened with delete access\n"); 729 err = -ESHARE; 730 ksmbd_fd_put(work, parent_fp); 731 goto out3; 732 } 733 ksmbd_fd_put(work, parent_fp); 734 } 735 736 new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry, 737 lookup_flags | LOOKUP_RENAME_TARGET); 738 if (IS_ERR(new_dentry)) { 739 err = PTR_ERR(new_dentry); 740 goto out3; 741 } 742 743 if (d_is_symlink(new_dentry)) { 744 err = -EACCES; 745 goto out4; 746 } 747 748 if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) { 749 err = -EEXIST; 750 goto out4; 751 } 752 753 if (old_child == trap) { 754 err = -EINVAL; 755 goto out4; 756 } 757 758 if (new_dentry == trap) { 759 err = -ENOTEMPTY; 760 goto out4; 761 } 762 763 rd.old_mnt_idmap = mnt_idmap(old_path->mnt), 764 rd.old_dir = d_inode(old_parent), 765 rd.old_dentry = old_child, 766 rd.new_mnt_idmap = mnt_idmap(new_path.mnt), 767 rd.new_dir = new_path.dentry->d_inode, 768 rd.new_dentry = new_dentry, 769 rd.flags = flags, 770 rd.delegated_inode = NULL, 771 err = vfs_rename(&rd); 772 if (err) 773 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err); 774 775out4: 776 dput(new_dentry); 777out3: 778 dput(old_parent); 779 unlock_rename(old_parent, new_path.dentry); 780 mnt_drop_write(old_path->mnt); 781out2: 782 path_put(&new_path); 783 784 if (retry_estale(err, lookup_flags)) { 785 lookup_flags |= LOOKUP_REVAL; 786 goto retry; 787 } 788out1: 789 putname(to); 790revert_fsids: 791 ksmbd_revert_fsids(work); 792 return err; 793} 794 795/** 796 * ksmbd_vfs_truncate() - vfs helper for smb file truncate 797 * @work: work 798 * @fid: file id of old file 799 * @size: truncate to given size 800 * 801 * Return: 0 on success, otherwise error 802 */ 803int ksmbd_vfs_truncate(struct ksmbd_work *work, 804 struct ksmbd_file *fp, loff_t size) 805{ 806 int err = 0; 807 struct file *filp; 808 809 filp = fp->filp; 810 811 /* Do we need to break any of a levelII oplock? */ 812 smb_break_all_levII_oplock(work, fp, 1); 813 814 if (!work->tcon->posix_extensions) { 815 struct inode *inode = file_inode(filp); 816 817 if (size < inode->i_size) { 818 err = check_lock_range(filp, size, 819 inode->i_size - 1, WRITE); 820 } else { 821 err = check_lock_range(filp, inode->i_size, 822 size - 1, WRITE); 823 } 824 825 if (err) { 826 pr_err("failed due to lock\n"); 827 return -EAGAIN; 828 } 829 } 830 831 err = vfs_truncate(&filp->f_path, size); 832 if (err) 833 pr_err("truncate failed, err %d\n", err); 834 return err; 835} 836 837/** 838 * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes 839 * @dentry: dentry of file for listing xattrs 840 * @list: destination buffer 841 * @size: destination buffer length 842 * 843 * Return: xattr list length on success, otherwise error 844 */ 845ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list) 846{ 847 ssize_t size; 848 char *vlist = NULL; 849 850 size = vfs_listxattr(dentry, NULL, 0); 851 if (size <= 0) 852 return size; 853 854 vlist = kvzalloc(size, GFP_KERNEL); 855 if (!vlist) 856 return -ENOMEM; 857 858 *list = vlist; 859 size = vfs_listxattr(dentry, vlist, size); 860 if (size < 0) { 861 ksmbd_debug(VFS, "listxattr failed\n"); 862 kvfree(vlist); 863 *list = NULL; 864 } 865 866 return size; 867} 868 869static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap, 870 struct dentry *dentry, char *xattr_name) 871{ 872 return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0); 873} 874 875/** 876 * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value 877 * @idmap: idmap 878 * @dentry: dentry of file for getting xattrs 879 * @xattr_name: name of xattr name to query 880 * @xattr_buf: destination buffer xattr value 881 * 882 * Return: read xattr value length on success, otherwise error 883 */ 884ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap, 885 struct dentry *dentry, 886 char *xattr_name, char **xattr_buf) 887{ 888 ssize_t xattr_len; 889 char *buf; 890 891 *xattr_buf = NULL; 892 xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name); 893 if (xattr_len < 0) 894 return xattr_len; 895 896 buf = kmalloc(xattr_len + 1, GFP_KERNEL); 897 if (!buf) 898 return -ENOMEM; 899 900 xattr_len = vfs_getxattr(idmap, dentry, xattr_name, 901 (void *)buf, xattr_len); 902 if (xattr_len > 0) 903 *xattr_buf = buf; 904 else 905 kfree(buf); 906 return xattr_len; 907} 908 909/** 910 * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value 911 * @idmap: idmap of the relevant mount 912 * @path: path of dentry to set XATTR at 913 * @attr_name: xattr name for setxattr 914 * @attr_value: xattr value to set 915 * @attr_size: size of xattr value 916 * @flags: destination buffer length 917 * @get_write: get write access to a mount 918 * 919 * Return: 0 on success, otherwise error 920 */ 921int ksmbd_vfs_setxattr(struct mnt_idmap *idmap, 922 const struct path *path, const char *attr_name, 923 void *attr_value, size_t attr_size, int flags, 924 bool get_write) 925{ 926 int err; 927 928 if (get_write == true) { 929 err = mnt_want_write(path->mnt); 930 if (err) 931 return err; 932 } 933 934 err = vfs_setxattr(idmap, 935 path->dentry, 936 attr_name, 937 attr_value, 938 attr_size, 939 flags); 940 if (err) 941 ksmbd_debug(VFS, "setxattr failed, err %d\n", err); 942 if (get_write == true) 943 mnt_drop_write(path->mnt); 944 return err; 945} 946 947/** 948 * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options 949 * @filp: file pointer for IO 950 * @options: smb IO options 951 */ 952void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option) 953{ 954 struct address_space *mapping; 955 956 mapping = filp->f_mapping; 957 958 if (!option || !mapping) 959 return; 960 961 if (option & FILE_WRITE_THROUGH_LE) { 962 filp->f_flags |= O_SYNC; 963 } else if (option & FILE_SEQUENTIAL_ONLY_LE) { 964 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2; 965 spin_lock(&filp->f_lock); 966 filp->f_mode &= ~FMODE_RANDOM; 967 spin_unlock(&filp->f_lock); 968 } else if (option & FILE_RANDOM_ACCESS_LE) { 969 spin_lock(&filp->f_lock); 970 filp->f_mode |= FMODE_RANDOM; 971 spin_unlock(&filp->f_lock); 972 } 973} 974 975int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp, 976 loff_t off, loff_t len) 977{ 978 smb_break_all_levII_oplock(work, fp, 1); 979 if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE) 980 return vfs_fallocate(fp->filp, 981 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 982 off, len); 983 984 return vfs_fallocate(fp->filp, 985 FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE, 986 off, len); 987} 988 989int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length, 990 struct file_allocated_range_buffer *ranges, 991 unsigned int in_count, unsigned int *out_count) 992{ 993 struct file *f = fp->filp; 994 struct inode *inode = file_inode(fp->filp); 995 loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end; 996 loff_t extent_start, extent_end; 997 int ret = 0; 998 999 if (start > maxbytes) 1000 return -EFBIG; 1001 1002 if (!in_count) 1003 return 0; 1004 1005 /* 1006 * Shrink request scope to what the fs can actually handle. 1007 */ 1008 if (length > maxbytes || (maxbytes - length) < start) 1009 length = maxbytes - start; 1010 1011 if (start + length > inode->i_size) 1012 length = inode->i_size - start; 1013 1014 *out_count = 0; 1015 end = start + length; 1016 while (start < end && *out_count < in_count) { 1017 extent_start = vfs_llseek(f, start, SEEK_DATA); 1018 if (extent_start < 0) { 1019 if (extent_start != -ENXIO) 1020 ret = (int)extent_start; 1021 break; 1022 } 1023 1024 if (extent_start >= end) 1025 break; 1026 1027 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE); 1028 if (extent_end < 0) { 1029 if (extent_end != -ENXIO) 1030 ret = (int)extent_end; 1031 break; 1032 } else if (extent_start >= extent_end) { 1033 break; 1034 } 1035 1036 ranges[*out_count].file_offset = cpu_to_le64(extent_start); 1037 ranges[(*out_count)++].length = 1038 cpu_to_le64(min(extent_end, end) - extent_start); 1039 1040 start = extent_end; 1041 } 1042 1043 return ret; 1044} 1045 1046int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap, 1047 const struct path *path, char *attr_name) 1048{ 1049 int err; 1050 1051 err = mnt_want_write(path->mnt); 1052 if (err) 1053 return err; 1054 1055 err = vfs_removexattr(idmap, path->dentry, attr_name); 1056 mnt_drop_write(path->mnt); 1057 1058 return err; 1059} 1060 1061int ksmbd_vfs_unlink(struct file *filp) 1062{ 1063 int err = 0; 1064 struct dentry *dir, *dentry = filp->f_path.dentry; 1065 struct mnt_idmap *idmap = file_mnt_idmap(filp); 1066 1067 err = mnt_want_write(filp->f_path.mnt); 1068 if (err) 1069 return err; 1070 1071 dir = dget_parent(dentry); 1072 err = ksmbd_vfs_lock_parent(dir, dentry); 1073 if (err) 1074 goto out; 1075 dget(dentry); 1076 1077 if (S_ISDIR(d_inode(dentry)->i_mode)) 1078 err = vfs_rmdir(idmap, d_inode(dir), dentry); 1079 else 1080 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL); 1081 1082 dput(dentry); 1083 inode_unlock(d_inode(dir)); 1084 if (err) 1085 ksmbd_debug(VFS, "failed to delete, err %d\n", err); 1086out: 1087 dput(dir); 1088 mnt_drop_write(filp->f_path.mnt); 1089 1090 return err; 1091} 1092 1093static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen, 1094 loff_t offset, u64 ino, unsigned int d_type) 1095{ 1096 struct ksmbd_readdir_data *buf; 1097 1098 buf = container_of(ctx, struct ksmbd_readdir_data, ctx); 1099 buf->dirent_count++; 1100 1101 return buf->dirent_count <= 2; 1102} 1103 1104/** 1105 * ksmbd_vfs_empty_dir() - check for empty directory 1106 * @fp: ksmbd file pointer 1107 * 1108 * Return: true if directory empty, otherwise false 1109 */ 1110int ksmbd_vfs_empty_dir(struct ksmbd_file *fp) 1111{ 1112 int err; 1113 struct ksmbd_readdir_data readdir_data; 1114 1115 memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data)); 1116 1117 set_ctx_actor(&readdir_data.ctx, __dir_empty); 1118 readdir_data.dirent_count = 0; 1119 1120 err = iterate_dir(fp->filp, &readdir_data.ctx); 1121 if (readdir_data.dirent_count > 2) 1122 err = -ENOTEMPTY; 1123 else 1124 err = 0; 1125 return err; 1126} 1127 1128static bool __caseless_lookup(struct dir_context *ctx, const char *name, 1129 int namlen, loff_t offset, u64 ino, 1130 unsigned int d_type) 1131{ 1132 struct ksmbd_readdir_data *buf; 1133 int cmp = -EINVAL; 1134 1135 buf = container_of(ctx, struct ksmbd_readdir_data, ctx); 1136 1137 if (buf->used != namlen) 1138 return true; 1139 if (IS_ENABLED(CONFIG_UNICODE) && buf->um) { 1140 const struct qstr q_buf = {.name = buf->private, 1141 .len = buf->used}; 1142 const struct qstr q_name = {.name = name, 1143 .len = namlen}; 1144 1145 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name); 1146 } 1147 if (cmp < 0) 1148 cmp = strncasecmp((char *)buf->private, name, namlen); 1149 if (!cmp) { 1150 memcpy((char *)buf->private, name, namlen); 1151 buf->dirent_count = 1; 1152 return false; 1153 } 1154 return true; 1155} 1156 1157/** 1158 * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory 1159 * @dir: path info 1160 * @name: filename to lookup 1161 * @namelen: filename length 1162 * 1163 * Return: 0 on success, otherwise error 1164 */ 1165static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name, 1166 size_t namelen, struct unicode_map *um) 1167{ 1168 int ret; 1169 struct file *dfilp; 1170 int flags = O_RDONLY | O_LARGEFILE; 1171 struct ksmbd_readdir_data readdir_data = { 1172 .ctx.actor = __caseless_lookup, 1173 .private = name, 1174 .used = namelen, 1175 .dirent_count = 0, 1176 .um = um, 1177 }; 1178 1179 dfilp = dentry_open(dir, flags, current_cred()); 1180 if (IS_ERR(dfilp)) 1181 return PTR_ERR(dfilp); 1182 1183 ret = iterate_dir(dfilp, &readdir_data.ctx); 1184 if (readdir_data.dirent_count > 0) 1185 ret = 0; 1186 fput(dfilp); 1187 return ret; 1188} 1189 1190/** 1191 * ksmbd_vfs_kern_path_locked() - lookup a file and get path info 1192 * @name: file path that is relative to share 1193 * @flags: lookup flags 1194 * @parent_path: if lookup succeed, return parent_path info 1195 * @path: if lookup succeed, return path info 1196 * @caseless: caseless filename lookup 1197 * 1198 * Return: 0 on success, otherwise error 1199 */ 1200int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name, 1201 unsigned int flags, struct path *parent_path, 1202 struct path *path, bool caseless) 1203{ 1204 struct ksmbd_share_config *share_conf = work->tcon->share_conf; 1205 int err; 1206 1207 err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path, 1208 path); 1209 if (!err) 1210 return 0; 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; 1260out2: 1261 path_put(parent_path); 1262out1: 1263 kfree(filepath); 1264 } 1265 1266 if (!err) { 1267 err = mnt_want_write(parent_path->mnt); 1268 if (err) { 1269 path_put(path); 1270 path_put(parent_path); 1271 return err; 1272 } 1273 1274 err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry); 1275 if (err) { 1276 path_put(path); 1277 path_put(parent_path); 1278 } 1279 } 1280 return err; 1281} 1282 1283void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path) 1284{ 1285 inode_unlock(d_inode(parent_path->dentry)); 1286 mnt_drop_write(parent_path->mnt); 1287 path_put(path); 1288 path_put(parent_path); 1289} 1290 1291struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work, 1292 const char *name, 1293 unsigned int flags, 1294 struct path *path) 1295{ 1296 char *abs_name; 1297 struct dentry *dent; 1298 1299 abs_name = convert_to_unix_name(work->tcon->share_conf, name); 1300 if (!abs_name) 1301 return ERR_PTR(-ENOMEM); 1302 1303 dent = kern_path_create(AT_FDCWD, abs_name, path, flags); 1304 kfree(abs_name); 1305 return dent; 1306} 1307 1308int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap, 1309 const struct path *path) 1310{ 1311 char *name, *xattr_list = NULL; 1312 ssize_t xattr_list_len; 1313 int err = 0; 1314 1315 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list); 1316 if (xattr_list_len < 0) { 1317 goto out; 1318 } else if (!xattr_list_len) { 1319 ksmbd_debug(SMB, "empty xattr in the file\n"); 1320 goto out; 1321 } 1322 1323 err = mnt_want_write(path->mnt); 1324 if (err) 1325 goto out; 1326 1327 for (name = xattr_list; name - xattr_list < xattr_list_len; 1328 name += strlen(name) + 1) { 1329 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name)); 1330 1331 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS, 1332 sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) || 1333 !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT, 1334 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) { 1335 err = vfs_remove_acl(idmap, path->dentry, name); 1336 if (err) 1337 ksmbd_debug(SMB, 1338 "remove acl xattr failed : %s\n", name); 1339 } 1340 } 1341 mnt_drop_write(path->mnt); 1342 1343out: 1344 kvfree(xattr_list); 1345 return err; 1346} 1347 1348int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path) 1349{ 1350 char *name, *xattr_list = NULL; 1351 ssize_t xattr_list_len; 1352 int err = 0; 1353 1354 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list); 1355 if (xattr_list_len < 0) { 1356 goto out; 1357 } else if (!xattr_list_len) { 1358 ksmbd_debug(SMB, "empty xattr in the file\n"); 1359 goto out; 1360 } 1361 1362 for (name = xattr_list; name - xattr_list < xattr_list_len; 1363 name += strlen(name) + 1) { 1364 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name)); 1365 1366 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) { 1367 err = ksmbd_vfs_remove_xattr(idmap, path, name); 1368 if (err) 1369 ksmbd_debug(SMB, "remove xattr failed : %s\n", name); 1370 } 1371 } 1372out: 1373 kvfree(xattr_list); 1374 return err; 1375} 1376 1377static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap, 1378 struct inode *inode, 1379 int acl_type) 1380{ 1381 struct xattr_smb_acl *smb_acl = NULL; 1382 struct posix_acl *posix_acls; 1383 struct posix_acl_entry *pa_entry; 1384 struct xattr_acl_entry *xa_entry; 1385 int i; 1386 1387 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1388 return NULL; 1389 1390 posix_acls = get_inode_acl(inode, acl_type); 1391 if (IS_ERR_OR_NULL(posix_acls)) 1392 return NULL; 1393 1394 smb_acl = kzalloc(sizeof(struct xattr_smb_acl) + 1395 sizeof(struct xattr_acl_entry) * posix_acls->a_count, 1396 GFP_KERNEL); 1397 if (!smb_acl) 1398 goto out; 1399 1400 smb_acl->count = posix_acls->a_count; 1401 pa_entry = posix_acls->a_entries; 1402 xa_entry = smb_acl->entries; 1403 for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) { 1404 switch (pa_entry->e_tag) { 1405 case ACL_USER: 1406 xa_entry->type = SMB_ACL_USER; 1407 xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry); 1408 break; 1409 case ACL_USER_OBJ: 1410 xa_entry->type = SMB_ACL_USER_OBJ; 1411 break; 1412 case ACL_GROUP: 1413 xa_entry->type = SMB_ACL_GROUP; 1414 xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry); 1415 break; 1416 case ACL_GROUP_OBJ: 1417 xa_entry->type = SMB_ACL_GROUP_OBJ; 1418 break; 1419 case ACL_OTHER: 1420 xa_entry->type = SMB_ACL_OTHER; 1421 break; 1422 case ACL_MASK: 1423 xa_entry->type = SMB_ACL_MASK; 1424 break; 1425 default: 1426 pr_err("unknown type : 0x%x\n", pa_entry->e_tag); 1427 goto out; 1428 } 1429 1430 if (pa_entry->e_perm & ACL_READ) 1431 xa_entry->perm |= SMB_ACL_READ; 1432 if (pa_entry->e_perm & ACL_WRITE) 1433 xa_entry->perm |= SMB_ACL_WRITE; 1434 if (pa_entry->e_perm & ACL_EXECUTE) 1435 xa_entry->perm |= SMB_ACL_EXECUTE; 1436 } 1437out: 1438 posix_acl_release(posix_acls); 1439 return smb_acl; 1440} 1441 1442int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn, 1443 struct mnt_idmap *idmap, 1444 const struct path *path, 1445 struct smb_ntsd *pntsd, int len, 1446 bool get_write) 1447{ 1448 int rc; 1449 struct ndr sd_ndr = {0}, acl_ndr = {0}; 1450 struct xattr_ntacl acl = {0}; 1451 struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL; 1452 struct dentry *dentry = path->dentry; 1453 struct inode *inode = d_inode(dentry); 1454 1455 acl.version = 4; 1456 acl.hash_type = XATTR_SD_HASH_TYPE_SHA256; 1457 acl.current_time = ksmbd_UnixTimeToNT(current_time(inode)); 1458 1459 memcpy(acl.desc, "posix_acl", 9); 1460 acl.desc_len = 10; 1461 1462 pntsd->osidoffset = 1463 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF); 1464 pntsd->gsidoffset = 1465 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF); 1466 pntsd->dacloffset = 1467 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF); 1468 1469 acl.sd_buf = (char *)pntsd; 1470 acl.sd_size = len; 1471 1472 rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash); 1473 if (rc) { 1474 pr_err("failed to generate hash for ndr acl\n"); 1475 return rc; 1476 } 1477 1478 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1479 ACL_TYPE_ACCESS); 1480 if (S_ISDIR(inode->i_mode)) 1481 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1482 ACL_TYPE_DEFAULT); 1483 1484 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, 1485 smb_acl, def_smb_acl); 1486 if (rc) { 1487 pr_err("failed to encode ndr to posix acl\n"); 1488 goto out; 1489 } 1490 1491 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, 1492 acl.posix_acl_hash); 1493 if (rc) { 1494 pr_err("failed to generate hash for ndr acl\n"); 1495 goto out; 1496 } 1497 1498 rc = ndr_encode_v4_ntacl(&sd_ndr, &acl); 1499 if (rc) { 1500 pr_err("failed to encode ndr to posix acl\n"); 1501 goto out; 1502 } 1503 1504 rc = ksmbd_vfs_setxattr(idmap, path, 1505 XATTR_NAME_SD, sd_ndr.data, 1506 sd_ndr.offset, 0, get_write); 1507 if (rc < 0) 1508 pr_err("Failed to store XATTR ntacl :%d\n", rc); 1509 1510 kfree(sd_ndr.data); 1511out: 1512 kfree(acl_ndr.data); 1513 kfree(smb_acl); 1514 kfree(def_smb_acl); 1515 return rc; 1516} 1517 1518int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn, 1519 struct mnt_idmap *idmap, 1520 struct dentry *dentry, 1521 struct smb_ntsd **pntsd) 1522{ 1523 int rc; 1524 struct ndr n; 1525 struct inode *inode = d_inode(dentry); 1526 struct ndr acl_ndr = {0}; 1527 struct xattr_ntacl acl; 1528 struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL; 1529 __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0}; 1530 1531 rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data); 1532 if (rc <= 0) 1533 return rc; 1534 1535 n.length = rc; 1536 rc = ndr_decode_v4_ntacl(&n, &acl); 1537 if (rc) 1538 goto free_n_data; 1539 1540 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1541 ACL_TYPE_ACCESS); 1542 if (S_ISDIR(inode->i_mode)) 1543 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode, 1544 ACL_TYPE_DEFAULT); 1545 1546 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl, 1547 def_smb_acl); 1548 if (rc) { 1549 pr_err("failed to encode ndr to posix acl\n"); 1550 goto out_free; 1551 } 1552 1553 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash); 1554 if (rc) { 1555 pr_err("failed to generate hash for ndr acl\n"); 1556 goto out_free; 1557 } 1558 1559 if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) { 1560 pr_err("hash value diff\n"); 1561 rc = -EINVAL; 1562 goto out_free; 1563 } 1564 1565 *pntsd = acl.sd_buf; 1566 if (acl.sd_size < sizeof(struct smb_ntsd)) { 1567 pr_err("sd size is invalid\n"); 1568 goto out_free; 1569 } 1570 1571 (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) - 1572 NDR_NTSD_OFFSETOF); 1573 (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) - 1574 NDR_NTSD_OFFSETOF); 1575 (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) - 1576 NDR_NTSD_OFFSETOF); 1577 1578 rc = acl.sd_size; 1579out_free: 1580 kfree(acl_ndr.data); 1581 kfree(smb_acl); 1582 kfree(def_smb_acl); 1583 if (rc < 0) { 1584 kfree(acl.sd_buf); 1585 *pntsd = NULL; 1586 } 1587 1588free_n_data: 1589 kfree(n.data); 1590 return rc; 1591} 1592 1593int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap, 1594 const struct path *path, 1595 struct xattr_dos_attrib *da, 1596 bool get_write) 1597{ 1598 struct ndr n; 1599 int err; 1600 1601 err = ndr_encode_dos_attr(&n, da); 1602 if (err) 1603 return err; 1604 1605 err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE, 1606 (void *)n.data, n.offset, 0, get_write); 1607 if (err) 1608 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n"); 1609 kfree(n.data); 1610 1611 return err; 1612} 1613 1614int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap, 1615 struct dentry *dentry, 1616 struct xattr_dos_attrib *da) 1617{ 1618 struct ndr n; 1619 int err; 1620 1621 err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE, 1622 (char **)&n.data); 1623 if (err > 0) { 1624 n.length = err; 1625 if (ndr_decode_dos_attr(&n, da)) 1626 err = -EINVAL; 1627 kfree(n.data); 1628 } else { 1629 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n"); 1630 } 1631 1632 return err; 1633} 1634 1635/** 1636 * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format 1637 * @p: destination buffer 1638 * @ksmbd_kstat: ksmbd kstat wrapper 1639 */ 1640void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat) 1641{ 1642 struct file_directory_info *info = (struct file_directory_info *)(*p); 1643 struct kstat *kstat = ksmbd_kstat->kstat; 1644 u64 time; 1645 1646 info->FileIndex = 0; 1647 info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time); 1648 time = ksmbd_UnixTimeToNT(kstat->atime); 1649 info->LastAccessTime = cpu_to_le64(time); 1650 time = ksmbd_UnixTimeToNT(kstat->mtime); 1651 info->LastWriteTime = cpu_to_le64(time); 1652 time = ksmbd_UnixTimeToNT(kstat->ctime); 1653 info->ChangeTime = cpu_to_le64(time); 1654 1655 if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) { 1656 info->EndOfFile = 0; 1657 info->AllocationSize = 0; 1658 } else { 1659 info->EndOfFile = cpu_to_le64(kstat->size); 1660 info->AllocationSize = cpu_to_le64(kstat->blocks << 9); 1661 } 1662 info->ExtFileAttributes = ksmbd_kstat->file_attributes; 1663 1664 return info; 1665} 1666 1667int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work, 1668 struct mnt_idmap *idmap, 1669 struct dentry *dentry, 1670 struct ksmbd_kstat *ksmbd_kstat) 1671{ 1672 u64 time; 1673 int rc; 1674 1675 generic_fillattr(idmap, STATX_BASIC_STATS, d_inode(dentry), 1676 ksmbd_kstat->kstat); 1677 1678 time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime); 1679 ksmbd_kstat->create_time = time; 1680 1681 /* 1682 * set default value for the case that store dos attributes is not yes 1683 * or that acl is disable in server's filesystem and the config is yes. 1684 */ 1685 if (S_ISDIR(ksmbd_kstat->kstat->mode)) 1686 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE; 1687 else 1688 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE; 1689 1690 if (test_share_config_flag(work->tcon->share_conf, 1691 KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) { 1692 struct xattr_dos_attrib da; 1693 1694 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da); 1695 if (rc > 0) { 1696 ksmbd_kstat->file_attributes = cpu_to_le32(da.attr); 1697 ksmbd_kstat->create_time = da.create_time; 1698 } else { 1699 ksmbd_debug(VFS, "fail to load dos attribute.\n"); 1700 } 1701 } 1702 1703 return 0; 1704} 1705 1706ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap, 1707 struct dentry *dentry, char *attr_name, 1708 int attr_name_len) 1709{ 1710 char *name, *xattr_list = NULL; 1711 ssize_t value_len = -ENOENT, xattr_list_len; 1712 1713 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list); 1714 if (xattr_list_len <= 0) 1715 goto out; 1716 1717 for (name = xattr_list; name - xattr_list < xattr_list_len; 1718 name += strlen(name) + 1) { 1719 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name)); 1720 if (strncasecmp(attr_name, name, attr_name_len)) 1721 continue; 1722 1723 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name); 1724 break; 1725 } 1726 1727out: 1728 kvfree(xattr_list); 1729 return value_len; 1730} 1731 1732int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name, 1733 size_t *xattr_stream_name_size, int s_type) 1734{ 1735 char *type, *buf; 1736 1737 if (s_type == DIR_STREAM) 1738 type = ":$INDEX_ALLOCATION"; 1739 else 1740 type = ":$DATA"; 1741 1742 buf = kasprintf(GFP_KERNEL, "%s%s%s", 1743 XATTR_NAME_STREAM, stream_name, type); 1744 if (!buf) 1745 return -ENOMEM; 1746 1747 *xattr_stream_name = buf; 1748 *xattr_stream_name_size = strlen(buf) + 1; 1749 1750 return 0; 1751} 1752 1753int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work, 1754 struct ksmbd_file *src_fp, 1755 struct ksmbd_file *dst_fp, 1756 struct srv_copychunk *chunks, 1757 unsigned int chunk_count, 1758 unsigned int *chunk_count_written, 1759 unsigned int *chunk_size_written, 1760 loff_t *total_size_written) 1761{ 1762 unsigned int i; 1763 loff_t src_off, dst_off, src_file_size; 1764 size_t len; 1765 int ret; 1766 1767 *chunk_count_written = 0; 1768 *chunk_size_written = 0; 1769 *total_size_written = 0; 1770 1771 if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) { 1772 pr_err("no right to read(%pD)\n", src_fp->filp); 1773 return -EACCES; 1774 } 1775 if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) { 1776 pr_err("no right to write(%pD)\n", dst_fp->filp); 1777 return -EACCES; 1778 } 1779 1780 if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp)) 1781 return -EBADF; 1782 1783 smb_break_all_levII_oplock(work, dst_fp, 1); 1784 1785 if (!work->tcon->posix_extensions) { 1786 for (i = 0; i < chunk_count; i++) { 1787 src_off = le64_to_cpu(chunks[i].SourceOffset); 1788 dst_off = le64_to_cpu(chunks[i].TargetOffset); 1789 len = le32_to_cpu(chunks[i].Length); 1790 1791 if (check_lock_range(src_fp->filp, src_off, 1792 src_off + len - 1, READ)) 1793 return -EAGAIN; 1794 if (check_lock_range(dst_fp->filp, dst_off, 1795 dst_off + len - 1, WRITE)) 1796 return -EAGAIN; 1797 } 1798 } 1799 1800 src_file_size = i_size_read(file_inode(src_fp->filp)); 1801 1802 for (i = 0; i < chunk_count; i++) { 1803 src_off = le64_to_cpu(chunks[i].SourceOffset); 1804 dst_off = le64_to_cpu(chunks[i].TargetOffset); 1805 len = le32_to_cpu(chunks[i].Length); 1806 1807 if (src_off + len > src_file_size) 1808 return -E2BIG; 1809 1810 ret = vfs_copy_file_range(src_fp->filp, src_off, 1811 dst_fp->filp, dst_off, len, 0); 1812 if (ret == -EOPNOTSUPP || ret == -EXDEV) 1813 ret = vfs_copy_file_range(src_fp->filp, src_off, 1814 dst_fp->filp, dst_off, len, 1815 COPY_FILE_SPLICE); 1816 if (ret < 0) 1817 return ret; 1818 1819 *chunk_count_written += 1; 1820 *total_size_written += ret; 1821 } 1822 return 0; 1823} 1824 1825void ksmbd_vfs_posix_lock_wait(struct file_lock *flock) 1826{ 1827 wait_event(flock->fl_wait, !flock->fl_blocker); 1828} 1829 1830int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout) 1831{ 1832 return wait_event_interruptible_timeout(flock->fl_wait, 1833 !flock->fl_blocker, 1834 timeout); 1835} 1836 1837void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock) 1838{ 1839 locks_delete_block(flock); 1840} 1841 1842int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap, 1843 struct path *path) 1844{ 1845 struct posix_acl_state acl_state; 1846 struct posix_acl *acls; 1847 struct dentry *dentry = path->dentry; 1848 struct inode *inode = d_inode(dentry); 1849 int rc; 1850 1851 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1852 return -EOPNOTSUPP; 1853 1854 ksmbd_debug(SMB, "Set posix acls\n"); 1855 rc = init_acl_state(&acl_state, 1); 1856 if (rc) 1857 return rc; 1858 1859 /* Set default owner group */ 1860 acl_state.owner.allow = (inode->i_mode & 0700) >> 6; 1861 acl_state.group.allow = (inode->i_mode & 0070) >> 3; 1862 acl_state.other.allow = inode->i_mode & 0007; 1863 acl_state.users->aces[acl_state.users->n].uid = inode->i_uid; 1864 acl_state.users->aces[acl_state.users->n++].perms.allow = 1865 acl_state.owner.allow; 1866 acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid; 1867 acl_state.groups->aces[acl_state.groups->n++].perms.allow = 1868 acl_state.group.allow; 1869 acl_state.mask.allow = 0x07; 1870 1871 acls = posix_acl_alloc(6, GFP_KERNEL); 1872 if (!acls) { 1873 free_acl_state(&acl_state); 1874 return -ENOMEM; 1875 } 1876 posix_state_to_acl(&acl_state, acls->a_entries); 1877 1878 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls); 1879 if (rc < 0) 1880 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", 1881 rc); 1882 else if (S_ISDIR(inode->i_mode)) { 1883 posix_state_to_acl(&acl_state, acls->a_entries); 1884 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls); 1885 if (rc < 0) 1886 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", 1887 rc); 1888 } 1889 1890 free_acl_state(&acl_state); 1891 posix_acl_release(acls); 1892 return rc; 1893} 1894 1895int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap, 1896 struct path *path, struct inode *parent_inode) 1897{ 1898 struct posix_acl *acls; 1899 struct posix_acl_entry *pace; 1900 struct dentry *dentry = path->dentry; 1901 struct inode *inode = d_inode(dentry); 1902 int rc, i; 1903 1904 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) 1905 return -EOPNOTSUPP; 1906 1907 acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT); 1908 if (IS_ERR_OR_NULL(acls)) 1909 return -ENOENT; 1910 pace = acls->a_entries; 1911 1912 for (i = 0; i < acls->a_count; i++, pace++) { 1913 if (pace->e_tag == ACL_MASK) { 1914 pace->e_perm = 0x07; 1915 break; 1916 } 1917 } 1918 1919 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls); 1920 if (rc < 0) 1921 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", 1922 rc); 1923 if (S_ISDIR(inode->i_mode)) { 1924 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, 1925 acls); 1926 if (rc < 0) 1927 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", 1928 rc); 1929 } 1930 1931 posix_acl_release(acls); 1932 return rc; 1933} 1934