ptyfs_vnops.c revision 1.58
1 /* $NetBSD: ptyfs_vnops.c,v 1.58 2020/04/13 19:23:18 ad Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95 35 */ 36 37 /* 38 * Copyright (c) 1993 Jan-Simon Pendry 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Jan-Simon Pendry. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95 72 */ 73 74 /* 75 * ptyfs vnode interface 76 */ 77 78 #include <sys/cdefs.h> 79 __KERNEL_RCSID(0, "$NetBSD: ptyfs_vnops.c,v 1.58 2020/04/13 19:23:18 ad Exp $"); 80 81 #include <sys/param.h> 82 #include <sys/systm.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/file.h> 86 #include <sys/filedesc.h> 87 #include <sys/proc.h> 88 #include <sys/vnode.h> 89 #include <sys/namei.h> 90 #include <sys/malloc.h> 91 #include <sys/mount.h> 92 #include <sys/select.h> 93 #include <sys/dirent.h> 94 #include <sys/resourcevar.h> 95 #include <sys/stat.h> 96 #include <sys/conf.h> 97 #include <sys/tty.h> 98 #include <sys/pty.h> 99 #include <sys/kauth.h> 100 101 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 102 103 #include <machine/reg.h> 104 105 #include <fs/ptyfs/ptyfs.h> 106 #include <miscfs/genfs/genfs.h> 107 #include <miscfs/specfs/specdev.h> 108 109 MALLOC_DECLARE(M_PTYFSTMP); 110 111 /* 112 * Vnode Operations. 113 * 114 */ 115 116 int ptyfs_lookup (void *); 117 #define ptyfs_create genfs_eopnotsupp 118 #define ptyfs_mknod genfs_eopnotsupp 119 int ptyfs_open (void *); 120 int ptyfs_close (void *); 121 int ptyfs_access (void *); 122 int ptyfs_getattr (void *); 123 int ptyfs_setattr (void *); 124 int ptyfs_read (void *); 125 int ptyfs_write (void *); 126 #define ptyfs_fcntl genfs_fcntl 127 int ptyfs_ioctl (void *); 128 int ptyfs_poll (void *); 129 int ptyfs_kqfilter (void *); 130 #define ptyfs_revoke genfs_revoke 131 #define ptyfs_mmap genfs_eopnotsupp 132 #define ptyfs_fsync genfs_nullop 133 #define ptyfs_seek genfs_nullop 134 #define ptyfs_remove genfs_eopnotsupp 135 #define ptyfs_link genfs_abortop 136 #define ptyfs_rename genfs_eopnotsupp 137 #define ptyfs_mkdir genfs_eopnotsupp 138 #define ptyfs_rmdir genfs_eopnotsupp 139 #define ptyfs_symlink genfs_abortop 140 int ptyfs_readdir (void *); 141 #define ptyfs_readlink genfs_eopnotsupp 142 #define ptyfs_abortop genfs_abortop 143 int ptyfs_reclaim (void *); 144 int ptyfs_inactive (void *); 145 #define ptyfs_lock genfs_lock 146 #define ptyfs_unlock genfs_unlock 147 #define ptyfs_bmap genfs_badop 148 #define ptyfs_strategy genfs_badop 149 int ptyfs_print (void *); 150 int ptyfs_pathconf (void *); 151 #define ptyfs_islocked genfs_islocked 152 int ptyfs_advlock (void *); 153 #define ptyfs_bwrite genfs_eopnotsupp 154 #define ptyfs_putpages genfs_null_putpages 155 156 static int ptyfs_update(struct vnode *, const struct timespec *, 157 const struct timespec *, int); 158 static int ptyfs_chown(struct vnode *, uid_t, gid_t, kauth_cred_t, 159 struct lwp *); 160 static int ptyfs_chmod(struct vnode *, mode_t, kauth_cred_t, struct lwp *); 161 static int atoi(const char *, size_t); 162 163 /* 164 * ptyfs vnode operations. 165 */ 166 int (**ptyfs_vnodeop_p)(void *); 167 const struct vnodeopv_entry_desc ptyfs_vnodeop_entries[] = { 168 { &vop_default_desc, vn_default_error }, 169 { &vop_lookup_desc, ptyfs_lookup }, /* lookup */ 170 { &vop_create_desc, ptyfs_create }, /* create */ 171 { &vop_mknod_desc, ptyfs_mknod }, /* mknod */ 172 { &vop_open_desc, ptyfs_open }, /* open */ 173 { &vop_close_desc, ptyfs_close }, /* close */ 174 { &vop_access_desc, ptyfs_access }, /* access */ 175 { &vop_getattr_desc, ptyfs_getattr }, /* getattr */ 176 { &vop_setattr_desc, ptyfs_setattr }, /* setattr */ 177 { &vop_read_desc, ptyfs_read }, /* read */ 178 { &vop_write_desc, ptyfs_write }, /* write */ 179 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 180 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 181 { &vop_ioctl_desc, ptyfs_ioctl }, /* ioctl */ 182 { &vop_fcntl_desc, ptyfs_fcntl }, /* fcntl */ 183 { &vop_poll_desc, ptyfs_poll }, /* poll */ 184 { &vop_kqfilter_desc, ptyfs_kqfilter }, /* kqfilter */ 185 { &vop_revoke_desc, ptyfs_revoke }, /* revoke */ 186 { &vop_mmap_desc, ptyfs_mmap }, /* mmap */ 187 { &vop_fsync_desc, ptyfs_fsync }, /* fsync */ 188 { &vop_seek_desc, ptyfs_seek }, /* seek */ 189 { &vop_remove_desc, ptyfs_remove }, /* remove */ 190 { &vop_link_desc, ptyfs_link }, /* link */ 191 { &vop_rename_desc, ptyfs_rename }, /* rename */ 192 { &vop_mkdir_desc, ptyfs_mkdir }, /* mkdir */ 193 { &vop_rmdir_desc, ptyfs_rmdir }, /* rmdir */ 194 { &vop_symlink_desc, ptyfs_symlink }, /* symlink */ 195 { &vop_readdir_desc, ptyfs_readdir }, /* readdir */ 196 { &vop_readlink_desc, ptyfs_readlink }, /* readlink */ 197 { &vop_abortop_desc, ptyfs_abortop }, /* abortop */ 198 { &vop_inactive_desc, ptyfs_inactive }, /* inactive */ 199 { &vop_reclaim_desc, ptyfs_reclaim }, /* reclaim */ 200 { &vop_lock_desc, ptyfs_lock }, /* lock */ 201 { &vop_unlock_desc, ptyfs_unlock }, /* unlock */ 202 { &vop_bmap_desc, ptyfs_bmap }, /* bmap */ 203 { &vop_strategy_desc, ptyfs_strategy }, /* strategy */ 204 { &vop_print_desc, ptyfs_print }, /* print */ 205 { &vop_islocked_desc, ptyfs_islocked }, /* islocked */ 206 { &vop_pathconf_desc, ptyfs_pathconf }, /* pathconf */ 207 { &vop_advlock_desc, ptyfs_advlock }, /* advlock */ 208 { &vop_bwrite_desc, ptyfs_bwrite }, /* bwrite */ 209 { &vop_putpages_desc, ptyfs_putpages }, /* putpages */ 210 { NULL, NULL } 211 }; 212 const struct vnodeopv_desc ptyfs_vnodeop_opv_desc = 213 { &ptyfs_vnodeop_p, ptyfs_vnodeop_entries }; 214 215 /* 216 * free any private data and remove the node 217 * from any private lists. 218 */ 219 int 220 ptyfs_reclaim(void *v) 221 { 222 struct vop_reclaim_v2_args /* { 223 struct vnode *a_vp; 224 } */ *ap = v; 225 struct vnode *vp = ap->a_vp; 226 227 VOP_UNLOCK(vp); 228 229 vp->v_data = NULL; 230 return 0; 231 } 232 233 int 234 ptyfs_inactive(void *v) 235 { 236 struct vop_inactive_v2_args /* { 237 struct vnode *a_vp; 238 bool *a_recycle; 239 } */ *ap = v; 240 struct vnode *vp = ap->a_vp; 241 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 242 243 if (ptyfs->ptyfs_type == PTYFSptc) 244 ptyfs_clr_active(vp->v_mount, ptyfs->ptyfs_pty); 245 246 return 0; 247 } 248 249 /* 250 * Return POSIX pathconf information applicable to special devices. 251 */ 252 int 253 ptyfs_pathconf(void *v) 254 { 255 struct vop_pathconf_args /* { 256 struct vnode *a_vp; 257 int a_name; 258 register_t *a_retval; 259 } */ *ap = v; 260 261 switch (ap->a_name) { 262 case _PC_LINK_MAX: 263 *ap->a_retval = LINK_MAX; 264 return 0; 265 case _PC_MAX_CANON: 266 *ap->a_retval = MAX_CANON; 267 return 0; 268 case _PC_MAX_INPUT: 269 *ap->a_retval = MAX_INPUT; 270 return 0; 271 case _PC_PIPE_BUF: 272 *ap->a_retval = PIPE_BUF; 273 return 0; 274 case _PC_CHOWN_RESTRICTED: 275 *ap->a_retval = 1; 276 return 0; 277 case _PC_VDISABLE: 278 *ap->a_retval = _POSIX_VDISABLE; 279 return 0; 280 case _PC_SYNC_IO: 281 *ap->a_retval = 1; 282 return 0; 283 default: 284 return EINVAL; 285 } 286 } 287 288 /* 289 * _print is used for debugging. 290 * just print a readable description 291 * of (vp). 292 */ 293 int 294 ptyfs_print(void *v) 295 { 296 struct vop_print_args /* { 297 struct vnode *a_vp; 298 } */ *ap = v; 299 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 300 301 printf("tag VT_PTYFS, type %d, pty %d\n", 302 ptyfs->ptyfs_type, ptyfs->ptyfs_pty); 303 return 0; 304 } 305 306 /* 307 * support advisory locking on pty nodes 308 */ 309 int 310 ptyfs_advlock(void *v) 311 { 312 struct vop_print_args /* { 313 struct vnode *a_vp; 314 } */ *ap = v; 315 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 316 317 switch (ptyfs->ptyfs_type) { 318 case PTYFSpts: 319 case PTYFSptc: 320 return spec_advlock(v); 321 default: 322 return EOPNOTSUPP; 323 } 324 } 325 326 /* 327 * Invent attributes for ptyfsnode (vp) and store 328 * them in (vap). 329 * Directories lengths are returned as zero since 330 * any real length would require the genuine size 331 * to be computed, and nothing cares anyway. 332 * 333 * this is relatively minimal for ptyfs. 334 */ 335 int 336 ptyfs_getattr(void *v) 337 { 338 struct vop_getattr_args /* { 339 struct vnode *a_vp; 340 struct vattr *a_vap; 341 kauth_cred_t a_cred; 342 } */ *ap = v; 343 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 344 struct vattr *vap = ap->a_vap; 345 346 PTYFS_ITIMES(ptyfs, NULL, NULL, NULL); 347 348 /* start by zeroing out the attributes */ 349 vattr_null(vap); 350 351 /* next do all the common fields */ 352 vap->va_type = ap->a_vp->v_type; 353 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 354 vap->va_fileid = ptyfs->ptyfs_fileno; 355 vap->va_gen = 0; 356 vap->va_flags = 0; 357 vap->va_blocksize = PAGE_SIZE; 358 359 vap->va_atime = ptyfs->ptyfs_atime; 360 vap->va_mtime = ptyfs->ptyfs_mtime; 361 vap->va_ctime = ptyfs->ptyfs_ctime; 362 vap->va_birthtime = ptyfs->ptyfs_birthtime; 363 vap->va_mode = ptyfs->ptyfs_mode; 364 vap->va_flags = ptyfs->ptyfs_flags; 365 vap->va_uid = ptyfs->ptyfs_uid; 366 vap->va_gid = ptyfs->ptyfs_gid; 367 368 switch (ptyfs->ptyfs_type) { 369 case PTYFSpts: 370 case PTYFSptc: 371 if (pty_isfree(ptyfs->ptyfs_pty, 1)) 372 return ENOENT; 373 vap->va_bytes = vap->va_size = 0; 374 vap->va_rdev = ap->a_vp->v_rdev; 375 vap->va_nlink = 1; 376 break; 377 case PTYFSroot: 378 vap->va_rdev = 0; 379 vap->va_bytes = vap->va_size = DEV_BSIZE; 380 vap->va_nlink = 2; 381 break; 382 default: 383 return EOPNOTSUPP; 384 } 385 386 return 0; 387 } 388 389 /*ARGSUSED*/ 390 int 391 ptyfs_setattr(void *v) 392 { 393 struct vop_setattr_args /* { 394 struct vnodeop_desc *a_desc; 395 struct vnode *a_vp; 396 struct vattr *a_vap; 397 kauth_cred_t a_cred; 398 } */ *ap = v; 399 struct vnode *vp = ap->a_vp; 400 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 401 struct vattr *vap = ap->a_vap; 402 kauth_cred_t cred = ap->a_cred; 403 struct lwp *l = curlwp; 404 int error; 405 kauth_action_t action = KAUTH_VNODE_WRITE_FLAGS; 406 bool changing_sysflags = false; 407 408 if (vap->va_size != VNOVALSIZE) { 409 switch (ptyfs->ptyfs_type) { 410 case PTYFSroot: 411 return EISDIR; 412 case PTYFSpts: 413 case PTYFSptc: 414 break; 415 default: 416 return EINVAL; 417 } 418 } 419 420 if (vap->va_flags != VNOVALFLAGS) { 421 if (vp->v_mount->mnt_flag & MNT_RDONLY) 422 return EROFS; 423 424 /* Immutable and append-only flags are not supported on ptyfs. */ 425 if (vap->va_flags & (IMMUTABLE | APPEND)) 426 return EINVAL; 427 428 /* Snapshot flag cannot be set or cleared */ 429 if ((vap->va_flags & SF_SNAPSHOT) != (ptyfs->ptyfs_flags & SF_SNAPSHOT)) 430 return EPERM; 431 432 if ((ptyfs->ptyfs_flags & SF_SETTABLE) != (vap->va_flags & SF_SETTABLE)) { 433 changing_sysflags = true; 434 action |= KAUTH_VNODE_WRITE_SYSFLAGS; 435 } 436 437 error = kauth_authorize_vnode(cred, action, vp, NULL, 438 genfs_can_chflags(cred, vp->v_type, ptyfs->ptyfs_uid, 439 changing_sysflags)); 440 if (error) 441 return error; 442 443 if (changing_sysflags) { 444 ptyfs->ptyfs_flags = vap->va_flags; 445 } else { 446 ptyfs->ptyfs_flags &= SF_SETTABLE; 447 ptyfs->ptyfs_flags |= (vap->va_flags & UF_SETTABLE); 448 } 449 ptyfs->ptyfs_status |= PTYFS_CHANGE; 450 } 451 452 /* 453 * Go through the fields and update iff not VNOVAL. 454 */ 455 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 456 if (vp->v_mount->mnt_flag & MNT_RDONLY) 457 return EROFS; 458 if (ptyfs->ptyfs_type == PTYFSroot) 459 return EPERM; 460 error = ptyfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 461 if (error) 462 return error; 463 } 464 465 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL || 466 vap->va_birthtime.tv_sec != VNOVAL) { 467 if (vp->v_mount->mnt_flag & MNT_RDONLY) 468 return EROFS; 469 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0) 470 return EPERM; 471 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, vp, 472 NULL, genfs_can_chtimes(vp, vap->va_vaflags, 473 ptyfs->ptyfs_uid, cred)); 474 if (error) 475 return (error); 476 if (vap->va_atime.tv_sec != VNOVAL) 477 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 478 ptyfs->ptyfs_status |= PTYFS_ACCESS; 479 if (vap->va_mtime.tv_sec != VNOVAL) { 480 ptyfs->ptyfs_status |= PTYFS_CHANGE | PTYFS_MODIFY; 481 if (vp->v_mount->mnt_flag & MNT_RELATIME) 482 ptyfs->ptyfs_status |= PTYFS_ACCESS; 483 } 484 if (vap->va_birthtime.tv_sec != VNOVAL) 485 ptyfs->ptyfs_birthtime = vap->va_birthtime; 486 ptyfs->ptyfs_status |= PTYFS_CHANGE; 487 error = ptyfs_update(vp, &vap->va_atime, &vap->va_mtime, 0); 488 if (error) 489 return error; 490 } 491 if (vap->va_mode != (mode_t)VNOVAL) { 492 if (vp->v_mount->mnt_flag & MNT_RDONLY) 493 return EROFS; 494 if (ptyfs->ptyfs_type == PTYFSroot) 495 return EPERM; 496 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0 && 497 (vap->va_mode & 498 (S_IXUSR|S_IWUSR|S_IXGRP|S_IWGRP|S_IXOTH|S_IWOTH))) 499 return EPERM; 500 error = ptyfs_chmod(vp, vap->va_mode, cred, l); 501 if (error) 502 return error; 503 } 504 VN_KNOTE(vp, NOTE_ATTRIB); 505 return 0; 506 } 507 508 /* 509 * Change the mode on a file. 510 * Inode must be locked before calling. 511 */ 512 static int 513 ptyfs_chmod(struct vnode *vp, mode_t mode, kauth_cred_t cred, struct lwp *l) 514 { 515 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 516 int error; 517 518 error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_SECURITY, vp, 519 NULL, genfs_can_chmod(vp->v_type, cred, ptyfs->ptyfs_uid, 520 ptyfs->ptyfs_gid, mode)); 521 if (error) 522 return (error); 523 524 ptyfs->ptyfs_mode &= ~ALLPERMS; 525 ptyfs->ptyfs_mode |= (mode & ALLPERMS); 526 return 0; 527 } 528 529 /* 530 * Perform chown operation on inode ip; 531 * inode must be locked prior to call. 532 */ 533 static int 534 ptyfs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 535 struct lwp *l) 536 { 537 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 538 int error; 539 540 if (uid == (uid_t)VNOVAL) 541 uid = ptyfs->ptyfs_uid; 542 if (gid == (gid_t)VNOVAL) 543 gid = ptyfs->ptyfs_gid; 544 545 error = kauth_authorize_vnode(cred, KAUTH_VNODE_CHANGE_OWNERSHIP, vp, 546 NULL, genfs_can_chown(cred, ptyfs->ptyfs_uid, ptyfs->ptyfs_gid, 547 uid, gid)); 548 if (error) 549 return (error); 550 551 ptyfs->ptyfs_gid = gid; 552 ptyfs->ptyfs_uid = uid; 553 return 0; 554 } 555 556 /* 557 * implement access checking. 558 * 559 * actually, the check for super-user is slightly 560 * broken since it will allow read access to write-only 561 * objects. this doesn't cause any particular trouble 562 * but does mean that the i/o entry points need to check 563 * that the operation really does make sense. 564 */ 565 int 566 ptyfs_access(void *v) 567 { 568 struct vop_access_args /* { 569 struct vnode *a_vp; 570 int a_mode; 571 kauth_cred_t a_cred; 572 } */ *ap = v; 573 struct vattr va; 574 int error; 575 576 if ((error = VOP_GETATTR(ap->a_vp, &va, ap->a_cred)) != 0) 577 return error; 578 579 return kauth_authorize_vnode(ap->a_cred, 580 KAUTH_ACCESS_ACTION(ap->a_mode, ap->a_vp->v_type, va.va_mode), 581 ap->a_vp, NULL, genfs_can_access(va.va_type, va.va_mode, va.va_uid, 582 va.va_gid, ap->a_mode, ap->a_cred)); 583 } 584 585 /* 586 * lookup. this is incredibly complicated in the 587 * general case, however for most pseudo-filesystems 588 * very little needs to be done. 589 * 590 * Locking isn't hard here, just poorly documented. 591 * 592 * If we're looking up ".", just vref the parent & return it. 593 * 594 * If we're looking up "..", unlock the parent, and lock "..". If everything 595 * went ok, try to re-lock the parent. We do this to prevent lock races. 596 * 597 * For anything else, get the needed node. 598 * 599 * We try to exit with the parent locked in error cases. 600 */ 601 int 602 ptyfs_lookup(void *v) 603 { 604 struct vop_lookup_v2_args /* { 605 struct vnode * a_dvp; 606 struct vnode ** a_vpp; 607 struct componentname * a_cnp; 608 } */ *ap = v; 609 struct componentname *cnp = ap->a_cnp; 610 struct vnode **vpp = ap->a_vpp; 611 struct vnode *dvp = ap->a_dvp; 612 const char *pname = cnp->cn_nameptr; 613 struct ptyfsnode *ptyfs; 614 int pty, error; 615 616 *vpp = NULL; 617 618 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 619 return EROFS; 620 621 if (cnp->cn_namelen == 1 && *pname == '.') { 622 *vpp = dvp; 623 vref(dvp); 624 return 0; 625 } 626 627 ptyfs = VTOPTYFS(dvp); 628 switch (ptyfs->ptyfs_type) { 629 case PTYFSroot: 630 /* 631 * Shouldn't get here with .. in the root node. 632 */ 633 if (cnp->cn_flags & ISDOTDOT) 634 return EIO; 635 636 pty = atoi(pname, cnp->cn_namelen); 637 if (pty < 0 || ptyfs_next_active(dvp->v_mount, pty) != pty) 638 break; 639 error = ptyfs_allocvp(dvp->v_mount, vpp, PTYFSpts, pty); 640 if (error) 641 return error; 642 if (ptyfs_next_active(dvp->v_mount, pty) != pty) { 643 vrele(*vpp); 644 *vpp = NULL; 645 return ENOENT; 646 } 647 return 0; 648 649 default: 650 return ENOTDIR; 651 } 652 653 return cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS; 654 } 655 656 /* 657 * readdir returns directory entries from ptyfsnode (vp). 658 * 659 * the strategy here with ptyfs is to generate a single 660 * directory entry at a time (struct dirent) and then 661 * copy that out to userland using uiomove. a more efficent 662 * though more complex implementation, would try to minimize 663 * the number of calls to uiomove(). for ptyfs, this is 664 * hardly worth the added code complexity. 665 * 666 * this should just be done through read() 667 */ 668 int 669 ptyfs_readdir(void *v) 670 { 671 struct vop_readdir_args /* { 672 struct vnode *a_vp; 673 struct uio *a_uio; 674 kauth_cred_t a_cred; 675 int *a_eofflag; 676 off_t **a_cookies; 677 int *a_ncookies; 678 } */ *ap = v; 679 struct uio *uio = ap->a_uio; 680 struct dirent *dp; 681 struct ptyfsnode *ptyfs; 682 off_t i; 683 int error; 684 off_t *cookies = NULL; 685 int ncookies; 686 struct vnode *vp; 687 int n, nc = 0; 688 689 vp = ap->a_vp; 690 ptyfs = VTOPTYFS(vp); 691 692 if (uio->uio_resid < UIO_MX) 693 return EINVAL; 694 if (uio->uio_offset < 0) 695 return EINVAL; 696 697 dp = malloc(sizeof(struct dirent), M_PTYFSTMP, M_WAITOK | M_ZERO); 698 699 error = 0; 700 i = uio->uio_offset; 701 dp->d_reclen = UIO_MX; 702 ncookies = uio->uio_resid / UIO_MX; 703 704 if (ptyfs->ptyfs_type != PTYFSroot) { 705 error = ENOTDIR; 706 goto out; 707 } 708 709 if (i >= npty) 710 goto out; 711 712 if (ap->a_ncookies) { 713 ncookies = uimin(ncookies, (npty + 2 - i)); 714 cookies = malloc(ncookies * sizeof (off_t), 715 M_TEMP, M_WAITOK); 716 *ap->a_cookies = cookies; 717 } 718 719 for (; i < 2; i++) { 720 /* `.' and/or `..' */ 721 dp->d_fileno = PTYFS_FILENO(0, PTYFSroot); 722 dp->d_namlen = i + 1; 723 (void)memcpy(dp->d_name, "..", dp->d_namlen); 724 dp->d_name[i + 1] = '\0'; 725 dp->d_type = DT_DIR; 726 if ((error = uiomove(dp, UIO_MX, uio)) != 0) 727 goto out; 728 if (cookies) 729 *cookies++ = i + 1; 730 nc++; 731 } 732 while (uio->uio_resid >= UIO_MX) { 733 /* check for used ptys */ 734 n = ptyfs_next_active(vp->v_mount, i - 2); 735 if (n < 0) 736 break; 737 dp->d_fileno = PTYFS_FILENO(n, PTYFSpts); 738 dp->d_namlen = snprintf(dp->d_name, sizeof(dp->d_name), 739 "%lld", (long long)(n)); 740 dp->d_type = DT_CHR; 741 if ((error = uiomove(dp, UIO_MX, uio)) != 0) 742 goto out; 743 i = n + 3; 744 if (cookies) 745 *cookies++ = i; 746 nc++; 747 } 748 749 out: 750 /* not pertinent in error cases */ 751 ncookies = nc; 752 753 if (ap->a_ncookies) { 754 if (error) { 755 if (cookies) 756 free(*ap->a_cookies, M_TEMP); 757 *ap->a_ncookies = 0; 758 *ap->a_cookies = NULL; 759 } else 760 *ap->a_ncookies = ncookies; 761 } 762 uio->uio_offset = i; 763 free(dp, M_PTYFSTMP); 764 return error; 765 } 766 767 int 768 ptyfs_open(void *v) 769 { 770 struct vop_open_args /* { 771 struct vnode *a_vp; 772 int a_mode; 773 kauth_cred_t a_cred; 774 } */ *ap = v; 775 struct vnode *vp = ap->a_vp; 776 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 777 778 switch (ptyfs->ptyfs_type) { 779 case PTYFSpts: 780 case PTYFSptc: 781 return spec_open(v); 782 case PTYFSroot: 783 return 0; 784 default: 785 return EINVAL; 786 } 787 } 788 789 int 790 ptyfs_close(void *v) 791 { 792 struct vop_close_args /* { 793 struct vnode *a_vp; 794 int a_fflag; 795 kauth_cred_t a_cred; 796 } */ *ap = v; 797 struct vnode *vp = ap->a_vp; 798 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 799 800 mutex_enter(vp->v_interlock); 801 if (vrefcnt(vp) > 1) 802 PTYFS_ITIMES(ptyfs, NULL, NULL, NULL); 803 mutex_exit(vp->v_interlock); 804 805 switch (ptyfs->ptyfs_type) { 806 case PTYFSpts: 807 case PTYFSptc: 808 return spec_close(v); 809 case PTYFSroot: 810 return 0; 811 default: 812 return EINVAL; 813 } 814 } 815 816 int 817 ptyfs_read(void *v) 818 { 819 struct vop_read_args /* { 820 struct vnode *a_vp; 821 struct uio *a_uio; 822 int a_ioflag; 823 kauth_cred_t a_cred; 824 } */ *ap = v; 825 struct timespec ts; 826 struct vnode *vp = ap->a_vp; 827 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 828 int error; 829 830 if (vp->v_type == VDIR) 831 return EISDIR; 832 833 ptyfs->ptyfs_status |= PTYFS_ACCESS; 834 /* hardclock() resolution is good enough for ptyfs */ 835 getnanotime(&ts); 836 (void)ptyfs_update(vp, &ts, &ts, 0); 837 838 switch (ptyfs->ptyfs_type) { 839 case PTYFSpts: 840 case PTYFSptc: 841 VOP_UNLOCK(vp); 842 error = cdev_read(vp->v_rdev, ap->a_uio, ap->a_ioflag); 843 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 844 return error; 845 default: 846 return EOPNOTSUPP; 847 } 848 } 849 850 int 851 ptyfs_write(void *v) 852 { 853 struct vop_write_args /* { 854 struct vnode *a_vp; 855 struct uio *a_uio; 856 int a_ioflag; 857 kauth_cred_t a_cred; 858 } */ *ap = v; 859 struct timespec ts; 860 struct vnode *vp = ap->a_vp; 861 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 862 int error; 863 864 ptyfs->ptyfs_status |= PTYFS_MODIFY; 865 getnanotime(&ts); 866 (void)ptyfs_update(vp, &ts, &ts, 0); 867 868 switch (ptyfs->ptyfs_type) { 869 case PTYFSpts: 870 case PTYFSptc: 871 VOP_UNLOCK(vp); 872 error = cdev_write(vp->v_rdev, ap->a_uio, ap->a_ioflag); 873 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 874 return error; 875 default: 876 return EOPNOTSUPP; 877 } 878 } 879 880 int 881 ptyfs_ioctl(void *v) 882 { 883 struct vop_ioctl_args /* { 884 struct vnode *a_vp; 885 u_long a_command; 886 void *a_data; 887 int a_fflag; 888 kauth_cred_t a_cred; 889 } */ *ap = v; 890 struct vnode *vp = ap->a_vp; 891 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 892 893 switch (ptyfs->ptyfs_type) { 894 case PTYFSpts: 895 case PTYFSptc: 896 return cdev_ioctl(vp->v_rdev, ap->a_command, 897 ap->a_data, ap->a_fflag, curlwp); 898 default: 899 return EOPNOTSUPP; 900 } 901 } 902 903 int 904 ptyfs_poll(void *v) 905 { 906 struct vop_poll_args /* { 907 struct vnode *a_vp; 908 int a_events; 909 } */ *ap = v; 910 struct vnode *vp = ap->a_vp; 911 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 912 913 switch (ptyfs->ptyfs_type) { 914 case PTYFSpts: 915 case PTYFSptc: 916 return cdev_poll(vp->v_rdev, ap->a_events, curlwp); 917 default: 918 return genfs_poll(v); 919 } 920 } 921 922 int 923 ptyfs_kqfilter(void *v) 924 { 925 struct vop_kqfilter_args /* { 926 struct vnode *a_vp; 927 struct knote *a_kn; 928 } */ *ap = v; 929 struct vnode *vp = ap->a_vp; 930 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 931 932 switch (ptyfs->ptyfs_type) { 933 case PTYFSpts: 934 case PTYFSptc: 935 return cdev_kqfilter(vp->v_rdev, ap->a_kn); 936 default: 937 return genfs_kqfilter(v); 938 } 939 } 940 941 static int 942 ptyfs_update(struct vnode *vp, const struct timespec *acc, 943 const struct timespec *mod, int flags) 944 { 945 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 946 947 if (vp->v_mount->mnt_flag & MNT_RDONLY) 948 return 0; 949 950 PTYFS_ITIMES(ptyfs, acc, mod, NULL); 951 return 0; 952 } 953 954 void 955 ptyfs_itimes(struct ptyfsnode *ptyfs, const struct timespec *acc, 956 const struct timespec *mod, const struct timespec *cre) 957 { 958 struct timespec now; 959 960 KASSERT(ptyfs->ptyfs_status & (PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY)); 961 962 getnanotime(&now); 963 if (ptyfs->ptyfs_status & PTYFS_ACCESS) { 964 if (acc == NULL) 965 acc = &now; 966 ptyfs->ptyfs_atime = *acc; 967 } 968 if (ptyfs->ptyfs_status & PTYFS_MODIFY) { 969 if (mod == NULL) 970 mod = &now; 971 ptyfs->ptyfs_mtime = *mod; 972 } 973 if (ptyfs->ptyfs_status & PTYFS_CHANGE) { 974 if (cre == NULL) 975 cre = &now; 976 ptyfs->ptyfs_ctime = *cre; 977 } 978 ptyfs->ptyfs_status &= ~(PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY); 979 } 980 981 /* 982 * convert decimal ascii to int 983 */ 984 static int 985 atoi(const char *b, size_t len) 986 { 987 int p = 0; 988 989 while (len--) { 990 char c = *b++; 991 if (c < '0' || c > '9') 992 return -1; 993 p = 10 * p + (c - '0'); 994 } 995 996 return p; 997 } 998
Indexes created Mon Sep 29 21:09:56 GMT 2025