| 1 | /* $NetBSD: ptyfs_vnops.c,v 1.52 2016/08/20 12:37:07 hannken 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 1.52 2016/08/20 12:37:07 hannken 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_args /* { |
| 223 | struct vnode *a_vp; |
| 224 | } */ *ap = v; |
| 225 | struct vnode *vp = ap->a_vp; |
| 226 | |
| 227 | vp->v_data = NULL; |
| 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | int |
| 232 | ptyfs_inactive(void *v) |
| 233 | { |
| 234 | struct vop_inactive_args /* { |
| 235 | struct vnode *a_vp; |
| 236 | bool *a_recycle; |
| 237 | } */ *ap = v; |
| 238 | struct vnode *vp = ap->a_vp; |
| 239 | struct ptyfsnode *ptyfs = VTOPTYFS(vp); |
| 240 | |
| 241 | if (ptyfs->ptyfs_type == PTYFSptc) |
| 242 | ptyfs_clr_active(vp->v_mount, ptyfs->ptyfs_pty); |
| 243 | VOP_UNLOCK(vp); |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | /* |
| 248 | * Return POSIX pathconf information applicable to special devices. |
| 249 | */ |
| 250 | int |
| 251 | ptyfs_pathconf(void *v) |
| 252 | { |
| 253 | struct vop_pathconf_args /* { |
| 254 | struct vnode *a_vp; |
| 255 | int a_name; |
| 256 | register_t *a_retval; |
| 257 | } */ *ap = v; |
| 258 | |
| 259 | switch (ap->a_name) { |
| 260 | case _PC_LINK_MAX: |
| 261 | *ap->a_retval = LINK_MAX; |
| 262 | return 0; |
| 263 | case _PC_MAX_CANON: |
| 264 | *ap->a_retval = MAX_CANON; |
| 265 | return 0; |
| 266 | case _PC_MAX_INPUT: |
| 267 | *ap->a_retval = MAX_INPUT; |
| 268 | return 0; |
| 269 | case _PC_PIPE_BUF: |
| 270 | *ap->a_retval = PIPE_BUF; |
| 271 | return 0; |
| 272 | case _PC_CHOWN_RESTRICTED: |
| 273 | *ap->a_retval = 1; |
| 274 | return 0; |
| 275 | case _PC_VDISABLE: |
| 276 | *ap->a_retval = _POSIX_VDISABLE; |
| 277 | return 0; |
| 278 | case _PC_SYNC_IO: |
| 279 | *ap->a_retval = 1; |
| 280 | return 0; |
| 281 | default: |
| 282 | return EINVAL; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | /* |
| 287 | * _print is used for debugging. |
| 288 | * just print a readable description |
| 289 | * of (vp). |
| 290 | */ |
| 291 | int |
| 292 | ptyfs_print(void *v) |
| 293 | { |
| 294 | struct vop_print_args /* { |
| 295 | struct vnode *a_vp; |
| 296 | } */ *ap = v; |
| 297 | struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); |
| 298 | |
| 299 | printf("tag VT_PTYFS, type %d, pty %d\n" , |
| 300 | ptyfs->ptyfs_type, ptyfs->ptyfs_pty); |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | /* |
| 305 | * support advisory locking on pty nodes |
| 306 | */ |
| 307 | int |
| 308 | ptyfs_advlock(void *v) |
| 309 | { |
| 310 | struct vop_print_args /* { |
| 311 | struct vnode *a_vp; |
| 312 | } */ *ap = v; |
| 313 | struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); |
| 314 | |
| 315 | switch (ptyfs->ptyfs_type) { |
| 316 | case PTYFSpts: |
| 317 | case PTYFSptc: |
| 318 | return spec_advlock(v); |
| 319 | default: |
| 320 | return EOPNOTSUPP; |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * Invent attributes for ptyfsnode (vp) and store |
| 326 | * them in (vap). |
| 327 | * Directories lengths are returned as zero since |
| 328 | * any real length would require the genuine size |
| 329 | * to be computed, and nothing cares anyway. |
| 330 | * |
| 331 | * this is relatively minimal for ptyfs. |
| 332 | */ |
| 333 | int |
| 334 | ptyfs_getattr(void *v) |
| 335 | { |
| 336 | struct vop_getattr_args /* { |
| 337 | struct vnode *a_vp; |
| 338 | struct vattr *a_vap; |
| 339 | kauth_cred_t a_cred; |
| 340 | } */ *ap = v; |
| 341 | struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); |
| 342 | struct vattr *vap = ap->a_vap; |
| 343 | |
| 344 | PTYFS_ITIMES(ptyfs, NULL, NULL, NULL); |
| 345 | |
| 346 | /* start by zeroing out the attributes */ |
| 347 | vattr_null(vap); |
| 348 | |
| 349 | /* next do all the common fields */ |
| 350 | vap->va_type = ap->a_vp->v_type; |
| 351 | vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; |
| 352 | vap->va_fileid = ptyfs->ptyfs_fileno; |
| 353 | vap->va_gen = 0; |
| 354 | vap->va_flags = 0; |
| 355 | vap->va_blocksize = PAGE_SIZE; |
| 356 | |
| 357 | vap->va_atime = ptyfs->ptyfs_atime; |
| 358 | vap->va_mtime = ptyfs->ptyfs_mtime; |
| 359 | vap->va_ctime = ptyfs->ptyfs_ctime; |
| 360 | vap->va_birthtime = ptyfs->ptyfs_birthtime; |
| 361 | vap->va_mode = ptyfs->ptyfs_mode; |
| 362 | vap->va_flags = ptyfs->ptyfs_flags; |
| 363 | vap->va_uid = ptyfs->ptyfs_uid; |
| 364 | vap->va_gid = ptyfs->ptyfs_gid; |
| 365 | |
| 366 | switch (ptyfs->ptyfs_type) { |
| 367 | case PTYFSpts: |
| 368 | case PTYFSptc: |
| 369 | if (pty_isfree(ptyfs->ptyfs_pty, 1)) |
| 370 | return ENOENT; |
| 371 | vap->va_bytes = vap->va_size = 0; |
| 372 | vap->va_rdev = ap->a_vp->v_rdev; |
| 373 | vap->va_nlink = 1; |
| 374 | break; |
| 375 | case PTYFSroot: |
| 376 | vap->va_rdev = 0; |
| 377 | vap->va_bytes = vap->va_size = DEV_BSIZE; |
| 378 | vap->va_nlink = 2; |
| 379 | break; |
| 380 | default: |
| 381 | return EOPNOTSUPP; |
| 382 | } |
| 383 | |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | /*ARGSUSED*/ |
| 388 | int |
| 389 | ptyfs_setattr(void *v) |
| 390 | { |
| 391 | struct vop_setattr_args /* { |
| 392 | struct vnodeop_desc *a_desc; |
| 393 | struct vnode *a_vp; |
| 394 | struct vattr *a_vap; |
| 395 | kauth_cred_t a_cred; |
| 396 | } */ *ap = v; |
| 397 | struct vnode *vp = ap->a_vp; |
| 398 | struct ptyfsnode *ptyfs = VTOPTYFS(vp); |
| 399 | struct vattr *vap = ap->a_vap; |
| 400 | kauth_cred_t cred = ap->a_cred; |
| 401 | struct lwp *l = curlwp; |
| 402 | int error; |
| 403 | kauth_action_t action = KAUTH_VNODE_WRITE_FLAGS; |
| 404 | bool changing_sysflags = false; |
| 405 | |
| 406 | if (vap->va_size != VNOVAL) { |
| 407 | switch (ptyfs->ptyfs_type) { |
| 408 | case PTYFSroot: |
| 409 | return EISDIR; |
| 410 | case PTYFSpts: |
| 411 | case PTYFSptc: |
| 412 | break; |
| 413 | default: |
| 414 | return EINVAL; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | if (vap->va_flags != VNOVAL) { |
| 419 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 420 | return EROFS; |
| 421 | |
| 422 | /* Immutable and append-only flags are not supported on ptyfs. */ |
| 423 | if (vap->va_flags & (IMMUTABLE | APPEND)) |
| 424 | return EINVAL; |
| 425 | |
| 426 | /* Snapshot flag cannot be set or cleared */ |
| 427 | if ((vap->va_flags & SF_SNAPSHOT) != (ptyfs->ptyfs_flags & SF_SNAPSHOT)) |
| 428 | return EPERM; |
| 429 | |
| 430 | if ((ptyfs->ptyfs_flags & SF_SETTABLE) != (vap->va_flags & SF_SETTABLE)) { |
| 431 | changing_sysflags = true; |
| 432 | action |= KAUTH_VNODE_WRITE_SYSFLAGS; |
| 433 | } |
| 434 | |
| 435 | error = kauth_authorize_vnode(cred, action, vp, NULL, |
| 436 | genfs_can_chflags(cred, vp->v_type, ptyfs->ptyfs_uid, |
| 437 | changing_sysflags)); |
| 438 | if (error) |
| 439 | return error; |
| 440 | |
| 441 | if (changing_sysflags) { |
| 442 | ptyfs->ptyfs_flags = vap->va_flags; |
| 443 | } else { |
| 444 | ptyfs->ptyfs_flags &= SF_SETTABLE; |
| 445 | ptyfs->ptyfs_flags |= (vap->va_flags & UF_SETTABLE); |
| 446 | } |
| 447 | ptyfs->ptyfs_status |= PTYFS_CHANGE; |
| 448 | } |
| 449 | |
| 450 | /* |
| 451 | * Go through the fields and update iff not VNOVAL. |
| 452 | */ |
| 453 | if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { |
| 454 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 455 | return EROFS; |
| 456 | if (ptyfs->ptyfs_type == PTYFSroot) |
| 457 | return EPERM; |
| 458 | error = ptyfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); |
| 459 | if (error) |
| 460 | return error; |
| 461 | } |
| 462 | |
| 463 | if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL || |
| 464 | vap->va_birthtime.tv_sec != VNOVAL) { |
| 465 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 466 | return EROFS; |
| 467 | if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0) |
| 468 | return EPERM; |
| 469 | error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, vp, |
| 470 | NULL, genfs_can_chtimes(vp, vap->va_vaflags, |
| 471 | ptyfs->ptyfs_uid, cred)); |
| 472 | if (error) |
| 473 | return (error); |
| 474 | if (vap->va_atime.tv_sec != VNOVAL) |
| 475 | if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) |
| 476 | ptyfs->ptyfs_status |= PTYFS_ACCESS; |
| 477 | if (vap->va_mtime.tv_sec != VNOVAL) { |
| 478 | ptyfs->ptyfs_status |= PTYFS_CHANGE | PTYFS_MODIFY; |
| 479 | if (vp->v_mount->mnt_flag & MNT_RELATIME) |
| 480 | ptyfs->ptyfs_status |= PTYFS_ACCESS; |
| 481 | } |
| 482 | if (vap->va_birthtime.tv_sec != VNOVAL) |
| 483 | ptyfs->ptyfs_birthtime = vap->va_birthtime; |
| 484 | ptyfs->ptyfs_status |= PTYFS_CHANGE; |
| 485 | error = ptyfs_update(vp, &vap->va_atime, &vap->va_mtime, 0); |
| 486 | if (error) |
| 487 | return error; |
| 488 | } |
| 489 | if (vap->va_mode != (mode_t)VNOVAL) { |
| 490 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 491 | return EROFS; |
| 492 | if (ptyfs->ptyfs_type == PTYFSroot) |
| 493 | return EPERM; |
| 494 | if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0 && |
| 495 | (vap->va_mode & |
| 496 | (S_IXUSR|S_IWUSR|S_IXGRP|S_IWGRP|S_IXOTH|S_IWOTH))) |
| 497 | return EPERM; |
| 498 | error = ptyfs_chmod(vp, vap->va_mode, cred, l); |
| 499 | if (error) |
| 500 | return error; |
| 501 | } |
| 502 | VN_KNOTE(vp, NOTE_ATTRIB); |
| 503 | return 0; |
| 504 | } |
| 505 | |
| 506 | /* |
| 507 | * Change the mode on a file. |
| 508 | * Inode must be locked before calling. |
| 509 | */ |
| 510 | static int |
| 511 | ptyfs_chmod(struct vnode *vp, mode_t mode, kauth_cred_t cred, struct lwp *l) |
| 512 | { |
| 513 | struct ptyfsnode *ptyfs = VTOPTYFS(vp); |
| 514 | int error; |
| 515 | |
| 516 | error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_SECURITY, vp, |
| 517 | NULL, genfs_can_chmod(vp->v_type, cred, ptyfs->ptyfs_uid, |
| 518 | ptyfs->ptyfs_gid, mode)); |
| 519 | if (error) |
| 520 | return (error); |
| 521 | |
| 522 | ptyfs->ptyfs_mode &= ~ALLPERMS; |
| 523 | ptyfs->ptyfs_mode |= (mode & ALLPERMS); |
| 524 | return 0; |
| 525 | } |
| 526 | |
| 527 | /* |
| 528 | * Perform chown operation on inode ip; |
| 529 | * inode must be locked prior to call. |
| 530 | */ |
| 531 | static int |
| 532 | ptyfs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, |
| 533 | struct lwp *l) |
| 534 | { |
| 535 | struct ptyfsnode *ptyfs = VTOPTYFS(vp); |
| 536 | int error; |
| 537 | |
| 538 | if (uid == (uid_t)VNOVAL) |
| 539 | uid = ptyfs->ptyfs_uid; |
| 540 | if (gid == (gid_t)VNOVAL) |
| 541 | gid = ptyfs->ptyfs_gid; |
| 542 | |
| 543 | error = kauth_authorize_vnode(cred, KAUTH_VNODE_CHANGE_OWNERSHIP, vp, |
| 544 | NULL, genfs_can_chown(cred, ptyfs->ptyfs_uid, ptyfs->ptyfs_gid, |
| 545 | uid, gid)); |
| 546 | if (error) |
| 547 | return (error); |
| 548 | |
| 549 | ptyfs->ptyfs_gid = gid; |
| 550 | ptyfs->ptyfs_uid = uid; |
| 551 | return 0; |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * implement access checking. |
| 556 | * |
| 557 | * actually, the check for super-user is slightly |
| 558 | * broken since it will allow read access to write-only |
| 559 | * objects. this doesn't cause any particular trouble |
| 560 | * but does mean that the i/o entry points need to check |
| 561 | * that the operation really does make sense. |
| 562 | */ |
| 563 | int |
| 564 | ptyfs_access(void *v) |
| 565 | { |
| 566 | struct vop_access_args /* { |
| 567 | struct vnode *a_vp; |
| 568 | int a_mode; |
| 569 | kauth_cred_t a_cred; |
| 570 | } */ *ap = v; |
| 571 | struct vattr va; |
| 572 | int error; |
| 573 | |
| 574 | if ((error = VOP_GETATTR(ap->a_vp, &va, ap->a_cred)) != 0) |
| 575 | return error; |
| 576 | |
| 577 | return kauth_authorize_vnode(ap->a_cred, |
| 578 | KAUTH_ACCESS_ACTION(ap->a_mode, ap->a_vp->v_type, va.va_mode), |
| 579 | ap->a_vp, NULL, genfs_can_access(va.va_type, va.va_mode, va.va_uid, |
| 580 | va.va_gid, ap->a_mode, ap->a_cred)); |
| 581 | } |
| 582 | |
| 583 | /* |
| 584 | * lookup. this is incredibly complicated in the |
| 585 | * general case, however for most pseudo-filesystems |
| 586 | * very little needs to be done. |
| 587 | * |
| 588 | * Locking isn't hard here, just poorly documented. |
| 589 | * |
| 590 | * If we're looking up ".", just vref the parent & return it. |
| 591 | * |
| 592 | * If we're looking up "..", unlock the parent, and lock "..". If everything |
| 593 | * went ok, try to re-lock the parent. We do this to prevent lock races. |
| 594 | * |
| 595 | * For anything else, get the needed node. |
| 596 | * |
| 597 | * We try to exit with the parent locked in error cases. |
| 598 | */ |
| 599 | int |
| 600 | ptyfs_lookup(void *v) |
| 601 | { |
| 602 | struct vop_lookup_v2_args /* { |
| 603 | struct vnode * a_dvp; |
| 604 | struct vnode ** a_vpp; |
| 605 | struct componentname * a_cnp; |
| 606 | } */ *ap = v; |
| 607 | struct componentname *cnp = ap->a_cnp; |
| 608 | struct vnode **vpp = ap->a_vpp; |
| 609 | struct vnode *dvp = ap->a_dvp; |
| 610 | const char *pname = cnp->cn_nameptr; |
| 611 | struct ptyfsnode *ptyfs; |
| 612 | int pty, error; |
| 613 | |
| 614 | *vpp = NULL; |
| 615 | |
| 616 | if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) |
| 617 | return EROFS; |
| 618 | |
| 619 | if (cnp->cn_namelen == 1 && *pname == '.') { |
| 620 | *vpp = dvp; |
| 621 | vref(dvp); |
| 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | ptyfs = VTOPTYFS(dvp); |
| 626 | switch (ptyfs->ptyfs_type) { |
| 627 | case PTYFSroot: |
| 628 | /* |
| 629 | * Shouldn't get here with .. in the root node. |
| 630 | */ |
| 631 | if (cnp->cn_flags & ISDOTDOT) |
| 632 | return EIO; |
| 633 | |
| 634 | pty = atoi(pname, cnp->cn_namelen); |
| 635 | if (pty < 0 || ptyfs_next_active(dvp->v_mount, pty) != pty) |
| 636 | break; |
| 637 | error = ptyfs_allocvp(dvp->v_mount, vpp, PTYFSpts, pty); |
| 638 | if (error) |
| 639 | return error; |
| 640 | if (ptyfs_next_active(dvp->v_mount, pty) != pty) { |
| 641 | vrele(*vpp); |
| 642 | *vpp = NULL; |
| 643 | return ENOENT; |
| 644 | } |
| 645 | return 0; |
| 646 | |
| 647 | default: |
| 648 | return ENOTDIR; |
| 649 | } |
| 650 | |
| 651 | return cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS; |
| 652 | } |
| 653 | |
| 654 | /* |
| 655 | * readdir returns directory entries from ptyfsnode (vp). |
| 656 | * |
| 657 | * the strategy here with ptyfs is to generate a single |
| 658 | * directory entry at a time (struct dirent) and then |
| 659 | * copy that out to userland using uiomove. a more efficent |
| 660 | * though more complex implementation, would try to minimize |
| 661 | * the number of calls to uiomove(). for ptyfs, this is |
| 662 | * hardly worth the added code complexity. |
| 663 | * |
| 664 | * this should just be done through read() |
| 665 | */ |
| 666 | int |
| 667 | ptyfs_readdir(void *v) |
| 668 | { |
| 669 | struct vop_readdir_args /* { |
| 670 | struct vnode *a_vp; |
| 671 | struct uio *a_uio; |
| 672 | kauth_cred_t a_cred; |
| 673 | int *a_eofflag; |
| 674 | off_t **a_cookies; |
| 675 | int *a_ncookies; |
| 676 | } */ *ap = v; |
| 677 | struct uio *uio = ap->a_uio; |
| 678 | struct dirent *dp; |
| 679 | struct ptyfsnode *ptyfs; |
| 680 | off_t i; |
| 681 | int error; |
| 682 | off_t *cookies = NULL; |
| 683 | int ncookies; |
| 684 | struct vnode *vp; |
| 685 | int n, nc = 0; |
| 686 | |
| 687 | vp = ap->a_vp; |
| 688 | ptyfs = VTOPTYFS(vp); |
| 689 | |
| 690 | if (uio->uio_resid < UIO_MX) |
| 691 | return EINVAL; |
| 692 | if (uio->uio_offset < 0) |
| 693 | return EINVAL; |
| 694 | |
| 695 | dp = malloc(sizeof(struct dirent), M_PTYFSTMP, M_WAITOK | M_ZERO); |
| 696 | |
| 697 | error = 0; |
| 698 | i = uio->uio_offset; |
| 699 | dp->d_reclen = UIO_MX; |
| 700 | ncookies = uio->uio_resid / UIO_MX; |
| 701 | |
| 702 | if (ptyfs->ptyfs_type != PTYFSroot) { |
| 703 | error = ENOTDIR; |
| 704 | goto out; |
| 705 | } |
| 706 | |
| 707 | if (i >= npty) |
| 708 | goto out; |
| 709 | |
| 710 | if (ap->a_ncookies) { |
| 711 | ncookies = min(ncookies, (npty + 2 - i)); |
| 712 | cookies = malloc(ncookies * sizeof (off_t), |
| 713 | M_TEMP, M_WAITOK); |
| 714 | *ap->a_cookies = cookies; |
| 715 | } |
| 716 | |
| 717 | for (; i < 2; i++) { |
| 718 | /* `.' and/or `..' */ |
| 719 | dp->d_fileno = PTYFS_FILENO(0, PTYFSroot); |
| 720 | dp->d_namlen = i + 1; |
| 721 | (void)memcpy(dp->d_name, ".." , dp->d_namlen); |
| 722 | dp->d_name[i + 1] = '\0'; |
| 723 | dp->d_type = DT_DIR; |
| 724 | if ((error = uiomove(dp, UIO_MX, uio)) != 0) |
| 725 | goto out; |
| 726 | if (cookies) |
| 727 | *cookies++ = i + 1; |
| 728 | nc++; |
| 729 | } |
| 730 | while (uio->uio_resid >= UIO_MX) { |
| 731 | /* check for used ptys */ |
| 732 | n = ptyfs_next_active(vp->v_mount, i - 2); |
| 733 | if (n < 0) |
| 734 | break; |
| 735 | dp->d_fileno = PTYFS_FILENO(n, PTYFSpts); |
| 736 | dp->d_namlen = snprintf(dp->d_name, sizeof(dp->d_name), |
| 737 | "%lld" , (long long)(n)); |
| 738 | dp->d_type = DT_CHR; |
| 739 | if ((error = uiomove(dp, UIO_MX, uio)) != 0) |
| 740 | goto out; |
| 741 | i = n + 3; |
| 742 | if (cookies) |
| 743 | *cookies++ = i; |
| 744 | nc++; |
| 745 | } |
| 746 | |
| 747 | out: |
| 748 | /* not pertinent in error cases */ |
| 749 | ncookies = nc; |
| 750 | |
| 751 | if (ap->a_ncookies) { |
| 752 | if (error) { |
| 753 | if (cookies) |
| 754 | free(*ap->a_cookies, M_TEMP); |
| 755 | *ap->a_ncookies = 0; |
| 756 | *ap->a_cookies = NULL; |
| 757 | } else |
| 758 | *ap->a_ncookies = ncookies; |
| 759 | } |
| 760 | uio->uio_offset = i; |
| 761 | free(dp, M_PTYFSTMP); |
| 762 | return error; |
| 763 | } |
| 764 | |
| 765 | int |
| 766 | ptyfs_open(void *v) |
| 767 | { |
| 768 | struct vop_open_args /* { |
| 769 | struct vnode *a_vp; |
| 770 | int a_mode; |
| 771 | kauth_cred_t a_cred; |
| 772 | } */ *ap = v; |
| 773 | struct vnode *vp = ap->a_vp; |
| 774 | struct ptyfsnode *ptyfs = VTOPTYFS(vp); |
| 775 | |
| 776 | switch (ptyfs->ptyfs_type) { |
| 777 | case PTYFSpts: |
| 778 | case PTYFSptc: |
| 779 | return spec_open(v); |
| 780 | case PTYFSroot: |
| 781 | return 0; |
| 782 | default: |
| 783 | return EINVAL; |
| 784 | } |
| 785 | } |
| 786 | |
| 787 | int |
| 788 | ptyfs_close(void *v) |
| 789 | { |
| 790 | struct vop_close_args /* { |
| 791 | struct vnode *a_vp; |
| 792 | int a_fflag; |
| 793 | kauth_cred_t a_cred; |
| 794 | } */ *ap = v; |
| 795 | struct vnode *vp = ap->a_vp; |
| 796 | struct ptyfsnode *ptyfs = VTOPTYFS(vp); |
| 797 | |
| 798 | mutex_enter(vp->v_interlock); |
| 799 | if (vp->v_usecount > 1) |
| 800 | PTYFS_ITIMES(ptyfs, NULL, NULL, NULL); |
| 801 | mutex_exit(vp->v_interlock); |
| 802 | |
| 803 | switch (ptyfs->ptyfs_type) { |
| 804 | case PTYFSpts: |
| 805 | case PTYFSptc: |
| 806 | return spec_close(v); |
| 807 | case PTYFSroot: |
| 808 | return 0; |
| 809 | default: |
| 810 | return EINVAL; |
| 811 | } |
| 812 | } |
| 813 | |
| 814 | int |
| 815 | ptyfs_read(void *v) |
| 816 | { |
| 817 | struct vop_read_args /* { |
| 818 | struct vnode *a_vp; |
| 819 | struct uio *a_uio; |
| 820 | int a_ioflag; |
| 821 | kauth_cred_t a_cred; |
| 822 | } */ *ap = v; |
| 823 | struct timespec ts; |
| 824 | struct vnode *vp = ap->a_vp; |
| 825 | struct ptyfsnode *ptyfs = VTOPTYFS(vp); |
| 826 | int error; |
| 827 | |
| 828 | if (vp->v_type == VDIR) |
| 829 | return EISDIR; |
| 830 | |
| 831 | ptyfs->ptyfs_status |= PTYFS_ACCESS; |
| 832 | /* hardclock() resolution is good enough for ptyfs */ |
| 833 | getnanotime(&ts); |
| 834 | (void)ptyfs_update(vp, &ts, &ts, 0); |
| 835 | |
| 836 | switch (ptyfs->ptyfs_type) { |
| 837 | case PTYFSpts: |
| 838 | case PTYFSptc: |
| 839 | VOP_UNLOCK(vp); |
| 840 | error = cdev_read(vp->v_rdev, ap->a_uio, ap->a_ioflag); |
| 841 | vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); |
| 842 | return error; |
| 843 | default: |
| 844 | return EOPNOTSUPP; |
| 845 | } |
| 846 | } |
| 847 | |
| 848 | int |
| 849 | ptyfs_write(void *v) |
| 850 | { |
| 851 | struct vop_write_args /* { |
| 852 | struct vnode *a_vp; |
| 853 | struct uio *a_uio; |
| 854 | int a_ioflag; |
| 855 | kauth_cred_t a_cred; |
| 856 | } */ *ap = v; |
| 857 | struct timespec ts; |
| 858 | struct vnode *vp = ap->a_vp; |
| 859 | struct ptyfsnode *ptyfs = VTOPTYFS(vp); |
| 860 | int error; |
| 861 | |
| 862 | ptyfs->ptyfs_status |= PTYFS_MODIFY; |
| 863 | getnanotime(&ts); |
| 864 | (void)ptyfs_update(vp, &ts, &ts, 0); |
| 865 | |
| 866 | switch (ptyfs->ptyfs_type) { |
| 867 | case PTYFSpts: |
| 868 | case PTYFSptc: |
| 869 | VOP_UNLOCK(vp); |
| 870 | error = cdev_write(vp->v_rdev, ap->a_uio, ap->a_ioflag); |
| 871 | vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); |
| 872 | return error; |
| 873 | default: |
| 874 | return EOPNOTSUPP; |
| 875 | } |
| 876 | } |
| 877 | |
| 878 | int |
| 879 | ptyfs_ioctl(void *v) |
| 880 | { |
| 881 | struct vop_ioctl_args /* { |
| 882 | struct vnode *a_vp; |
| 883 | u_long a_command; |
| 884 | void *a_data; |
| 885 | int a_fflag; |
| 886 | kauth_cred_t a_cred; |
| 887 | } */ *ap = v; |
| 888 | struct vnode *vp = ap->a_vp; |
| 889 | struct ptyfsnode *ptyfs = VTOPTYFS(vp); |
| 890 | |
| 891 | switch (ptyfs->ptyfs_type) { |
| 892 | case PTYFSpts: |
| 893 | case PTYFSptc: |
| 894 | return cdev_ioctl(vp->v_rdev, ap->a_command, |
| 895 | ap->a_data, ap->a_fflag, curlwp); |
| 896 | default: |
| 897 | return EOPNOTSUPP; |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | int |
| 902 | ptyfs_poll(void *v) |
| 903 | { |
| 904 | struct vop_poll_args /* { |
| 905 | struct vnode *a_vp; |
| 906 | int a_events; |
| 907 | } */ *ap = v; |
| 908 | struct vnode *vp = ap->a_vp; |
| 909 | struct ptyfsnode *ptyfs = VTOPTYFS(vp); |
| 910 | |
| 911 | switch (ptyfs->ptyfs_type) { |
| 912 | case PTYFSpts: |
| 913 | case PTYFSptc: |
| 914 | return cdev_poll(vp->v_rdev, ap->a_events, curlwp); |
| 915 | default: |
| 916 | return genfs_poll(v); |
| 917 | } |
| 918 | } |
| 919 | |
| 920 | int |
| 921 | ptyfs_kqfilter(void *v) |
| 922 | { |
| 923 | struct vop_kqfilter_args /* { |
| 924 | struct vnode *a_vp; |
| 925 | struct knote *a_kn; |
| 926 | } */ *ap = v; |
| 927 | struct vnode *vp = ap->a_vp; |
| 928 | struct ptyfsnode *ptyfs = VTOPTYFS(vp); |
| 929 | |
| 930 | switch (ptyfs->ptyfs_type) { |
| 931 | case PTYFSpts: |
| 932 | case PTYFSptc: |
| 933 | return cdev_kqfilter(vp->v_rdev, ap->a_kn); |
| 934 | default: |
| 935 | return genfs_kqfilter(v); |
| 936 | } |
| 937 | } |
| 938 | |
| 939 | static int |
| 940 | ptyfs_update(struct vnode *vp, const struct timespec *acc, |
| 941 | const struct timespec *mod, int flags) |
| 942 | { |
| 943 | struct ptyfsnode *ptyfs = VTOPTYFS(vp); |
| 944 | |
| 945 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
| 946 | return 0; |
| 947 | |
| 948 | PTYFS_ITIMES(ptyfs, acc, mod, NULL); |
| 949 | return 0; |
| 950 | } |
| 951 | |
| 952 | void |
| 953 | ptyfs_itimes(struct ptyfsnode *ptyfs, const struct timespec *acc, |
| 954 | const struct timespec *mod, const struct timespec *cre) |
| 955 | { |
| 956 | struct timespec now; |
| 957 | |
| 958 | KASSERT(ptyfs->ptyfs_status & (PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY)); |
| 959 | |
| 960 | getnanotime(&now); |
| 961 | if (ptyfs->ptyfs_status & PTYFS_ACCESS) { |
| 962 | if (acc == NULL) |
| 963 | acc = &now; |
| 964 | ptyfs->ptyfs_atime = *acc; |
| 965 | } |
| 966 | if (ptyfs->ptyfs_status & PTYFS_MODIFY) { |
| 967 | if (mod == NULL) |
| 968 | mod = &now; |
| 969 | ptyfs->ptyfs_mtime = *mod; |
| 970 | } |
| 971 | if (ptyfs->ptyfs_status & PTYFS_CHANGE) { |
| 972 | if (cre == NULL) |
| 973 | cre = &now; |
| 974 | ptyfs->ptyfs_ctime = *cre; |
| 975 | } |
| 976 | ptyfs->ptyfs_status &= ~(PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY); |
| 977 | } |
| 978 | |
| 979 | /* |
| 980 | * convert decimal ascii to int |
| 981 | */ |
| 982 | static int |
| 983 | atoi(const char *b, size_t len) |
| 984 | { |
| 985 | int p = 0; |
| 986 | |
| 987 | while (len--) { |
| 988 | char c = *b++; |
| 989 | if (c < '0' || c > '9') |
| 990 | return -1; |
| 991 | p = 10 * p + (c - '0'); |
| 992 | } |
| 993 | |
| 994 | return p; |
| 995 | } |
| 996 | |