| 1 | /* |
| 2 | * Copyright (c) 1989, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * (c) UNIX System Laboratories, Inc. |
| 5 | * All or some portions of this file are derived from material licensed |
| 6 | * to the University of California by American Telephone and Telegraph |
| 7 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 8 | * the permission of UNIX System Laboratories, Inc. |
| 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. All advertising materials mentioning features or use of this software |
| 19 | * must display the following acknowledgement: |
| 20 | * This product includes software developed by the University of |
| 21 | * California, Berkeley and its contributors. |
| 22 | * 4. Neither the name of the University nor the names of its contributors |
| 23 | * may be used to endorse or promote products derived from this software |
| 24 | * without specific prior written permission. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 36 | * SUCH DAMAGE. |
| 37 | * |
| 38 | * @(#)vfs_syscalls.c 8.13 (Berkeley) 4/15/94 |
| 39 | * $FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.151.2.18 2003/04/04 20:35:58 tegge Exp $ |
| 40 | * $DragonFly: src/sys/kern/vfs_syscalls.c,v 1.99 2006/08/11 01:54:59 dillon Exp $ |
| 41 | */ |
| 42 | |
| 43 | #include <sys/param.h> |
| 44 | #include <sys/systm.h> |
| 45 | #include <sys/buf.h> |
| 46 | #include <sys/conf.h> |
| 47 | #include <sys/sysent.h> |
| 48 | #include <sys/malloc.h> |
| 49 | #include <sys/mount.h> |
| 50 | #include <sys/mountctl.h> |
| 51 | #include <sys/sysproto.h> |
| 52 | #include <sys/filedesc.h> |
| 53 | #include <sys/kernel.h> |
| 54 | #include <sys/fcntl.h> |
| 55 | #include <sys/file.h> |
| 56 | #include <sys/linker.h> |
| 57 | #include <sys/stat.h> |
| 58 | #include <sys/unistd.h> |
| 59 | #include <sys/vnode.h> |
| 60 | #include <sys/proc.h> |
| 61 | #include <sys/namei.h> |
| 62 | #include <sys/nlookup.h> |
| 63 | #include <sys/dirent.h> |
| 64 | #include <sys/extattr.h> |
| 65 | #include <sys/spinlock.h> |
| 66 | #include <sys/kern_syscall.h> |
| 67 | #include <sys/objcache.h> |
| 68 | |
| 69 | #include <machine/limits.h> |
| 70 | #include <vfs/union/union.h> |
| 71 | #include <sys/sysctl.h> |
| 72 | #include <vm/vm.h> |
| 73 | #include <vm/vm_object.h> |
| 74 | #include <vm/vm_page.h> |
| 75 | |
| 76 | #include <sys/file2.h> |
| 77 | #include <sys/spinlock2.h> |
| 78 | |
| 79 | static int checkvp_chdir (struct vnode *vn, struct thread *td); |
| 80 | static void checkdirs (struct vnode *olddp, struct namecache *ncp); |
| 81 | static int chroot_refuse_vdir_fds (struct filedesc *fdp); |
| 82 | static int chroot_visible_mnt(struct mount *mp, struct proc *p); |
| 83 | static int getutimes (const struct timeval *, struct timespec *); |
| 84 | static int setfown (struct vnode *, uid_t, gid_t); |
| 85 | static int setfmode (struct vnode *, int); |
| 86 | static int setfflags (struct vnode *, int); |
| 87 | static int setutimes (struct vnode *, const struct timespec *, int); |
| 88 | static int usermount = 0; /* if 1, non-root can mount fs. */ |
| 89 | |
| 90 | int (*union_dircheckp) (struct thread *, struct vnode **, struct file *); |
| 91 | |
| 92 | SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, ""); |
| 93 | |
| 94 | /* |
| 95 | * Virtual File System System Calls |
| 96 | */ |
| 97 | |
| 98 | /* |
| 99 | * Mount a file system. |
| 100 | */ |
| 101 | /* |
| 102 | * mount_args(char *type, char *path, int flags, caddr_t data) |
| 103 | */ |
| 104 | /* ARGSUSED */ |
| 105 | int |
| 106 | sys_mount(struct mount_args *uap) |
| 107 | { |
| 108 | struct thread *td = curthread; |
| 109 | struct proc *p = td->td_proc; |
| 110 | struct vnode *vp; |
| 111 | struct namecache *ncp; |
| 112 | struct mount *mp; |
| 113 | struct vfsconf *vfsp; |
| 114 | int error, flag = 0, flag2 = 0; |
| 115 | struct vattr va; |
| 116 | struct nlookupdata nd; |
| 117 | char fstypename[MFSNAMELEN]; |
| 118 | struct nlcomponent nlc; |
| 119 | struct ucred *cred = p->p_ucred; |
| 120 | |
| 121 | KKASSERT(p); |
| 122 | if (cred->cr_prison != NULL) |
| 123 | return (EPERM); |
| 124 | if (usermount == 0 && (error = suser(td))) |
| 125 | return (error); |
| 126 | /* |
| 127 | * Do not allow NFS export by non-root users. |
| 128 | */ |
| 129 | if (uap->flags & MNT_EXPORTED) { |
| 130 | error = suser(td); |
| 131 | if (error) |
| 132 | return (error); |
| 133 | } |
| 134 | /* |
| 135 | * Silently enforce MNT_NOSUID and MNT_NODEV for non-root users |
| 136 | */ |
| 137 | if (suser(td)) |
| 138 | uap->flags |= MNT_NOSUID | MNT_NODEV; |
| 139 | |
| 140 | /* |
| 141 | * Lookup the requested path and extract the ncp and vnode. |
| 142 | */ |
| 143 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 144 | if (error == 0) { |
| 145 | if ((error = nlookup(&nd)) == 0) { |
| 146 | if (nd.nl_ncp->nc_vp == NULL) |
| 147 | error = ENOENT; |
| 148 | } |
| 149 | } |
| 150 | if (error) { |
| 151 | nlookup_done(&nd); |
| 152 | return (error); |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * Extract the locked+refd ncp and cleanup the nd structure |
| 157 | */ |
| 158 | ncp = nd.nl_ncp; |
| 159 | nd.nl_ncp = NULL; |
| 160 | nlookup_done(&nd); |
| 161 | |
| 162 | /* |
| 163 | * now we have the locked ref'd ncp and unreferenced vnode. |
| 164 | */ |
| 165 | vp = ncp->nc_vp; |
| 166 | if ((error = vget(vp, LK_EXCLUSIVE)) != 0) { |
| 167 | cache_put(ncp); |
| 168 | return (error); |
| 169 | } |
| 170 | cache_unlock(ncp); |
| 171 | |
| 172 | /* |
| 173 | * Now we have an unlocked ref'd ncp and a locked ref'd vp |
| 174 | */ |
| 175 | if (uap->flags & MNT_UPDATE) { |
| 176 | if ((vp->v_flag & VROOT) == 0) { |
| 177 | cache_drop(ncp); |
| 178 | vput(vp); |
| 179 | return (EINVAL); |
| 180 | } |
| 181 | mp = vp->v_mount; |
| 182 | flag = mp->mnt_flag; |
| 183 | flag2 = mp->mnt_kern_flag; |
| 184 | /* |
| 185 | * We only allow the filesystem to be reloaded if it |
| 186 | * is currently mounted read-only. |
| 187 | */ |
| 188 | if ((uap->flags & MNT_RELOAD) && |
| 189 | ((mp->mnt_flag & MNT_RDONLY) == 0)) { |
| 190 | cache_drop(ncp); |
| 191 | vput(vp); |
| 192 | return (EOPNOTSUPP); /* Needs translation */ |
| 193 | } |
| 194 | /* |
| 195 | * Only root, or the user that did the original mount is |
| 196 | * permitted to update it. |
| 197 | */ |
| 198 | if (mp->mnt_stat.f_owner != cred->cr_uid && |
| 199 | (error = suser(td))) { |
| 200 | cache_drop(ncp); |
| 201 | vput(vp); |
| 202 | return (error); |
| 203 | } |
| 204 | if (vfs_busy(mp, LK_NOWAIT)) { |
| 205 | cache_drop(ncp); |
| 206 | vput(vp); |
| 207 | return (EBUSY); |
| 208 | } |
| 209 | if ((vp->v_flag & VMOUNT) != 0 || |
| 210 | vp->v_mountedhere != NULL) { |
| 211 | cache_drop(ncp); |
| 212 | vfs_unbusy(mp); |
| 213 | vput(vp); |
| 214 | return (EBUSY); |
| 215 | } |
| 216 | vp->v_flag |= VMOUNT; |
| 217 | mp->mnt_flag |= |
| 218 | uap->flags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); |
| 219 | VOP_UNLOCK(vp, 0); |
| 220 | goto update; |
| 221 | } |
| 222 | /* |
| 223 | * If the user is not root, ensure that they own the directory |
| 224 | * onto which we are attempting to mount. |
| 225 | */ |
| 226 | if ((error = VOP_GETATTR(vp, &va)) || |
| 227 | (va.va_uid != cred->cr_uid && (error = suser(td)))) { |
| 228 | cache_drop(ncp); |
| 229 | vput(vp); |
| 230 | return (error); |
| 231 | } |
| 232 | if ((error = vinvalbuf(vp, V_SAVE, 0, 0)) != 0) { |
| 233 | cache_drop(ncp); |
| 234 | vput(vp); |
| 235 | return (error); |
| 236 | } |
| 237 | if (vp->v_type != VDIR) { |
| 238 | cache_drop(ncp); |
| 239 | vput(vp); |
| 240 | return (ENOTDIR); |
| 241 | } |
| 242 | if ((error = copyinstr(uap->type, fstypename, MFSNAMELEN, NULL)) != 0) { |
| 243 | cache_drop(ncp); |
| 244 | vput(vp); |
| 245 | return (error); |
| 246 | } |
| 247 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { |
| 248 | if (!strcmp(vfsp->vfc_name, fstypename)) |
| 249 | break; |
| 250 | } |
| 251 | if (vfsp == NULL) { |
| 252 | linker_file_t lf; |
| 253 | |
| 254 | /* Only load modules for root (very important!) */ |
| 255 | if ((error = suser(td)) != 0) { |
| 256 | cache_drop(ncp); |
| 257 | vput(vp); |
| 258 | return error; |
| 259 | } |
| 260 | error = linker_load_file(fstypename, &lf); |
| 261 | if (error || lf == NULL) { |
| 262 | cache_drop(ncp); |
| 263 | vput(vp); |
| 264 | if (lf == NULL) |
| 265 | error = ENODEV; |
| 266 | return error; |
| 267 | } |
| 268 | lf->userrefs++; |
| 269 | /* lookup again, see if the VFS was loaded */ |
| 270 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { |
| 271 | if (!strcmp(vfsp->vfc_name, fstypename)) |
| 272 | break; |
| 273 | } |
| 274 | if (vfsp == NULL) { |
| 275 | lf->userrefs--; |
| 276 | linker_file_unload(lf); |
| 277 | cache_drop(ncp); |
| 278 | vput(vp); |
| 279 | return (ENODEV); |
| 280 | } |
| 281 | } |
| 282 | if ((vp->v_flag & VMOUNT) != 0 || |
| 283 | vp->v_mountedhere != NULL) { |
| 284 | cache_drop(ncp); |
| 285 | vput(vp); |
| 286 | return (EBUSY); |
| 287 | } |
| 288 | vp->v_flag |= VMOUNT; |
| 289 | |
| 290 | /* |
| 291 | * Allocate and initialize the filesystem. |
| 292 | */ |
| 293 | mp = malloc(sizeof(struct mount), M_MOUNT, M_ZERO|M_WAITOK); |
| 294 | TAILQ_INIT(&mp->mnt_nvnodelist); |
| 295 | TAILQ_INIT(&mp->mnt_reservedvnlist); |
| 296 | TAILQ_INIT(&mp->mnt_jlist); |
| 297 | mp->mnt_nvnodelistsize = 0; |
| 298 | lockinit(&mp->mnt_lock, "vfslock", 0, 0); |
| 299 | vfs_busy(mp, LK_NOWAIT); |
| 300 | mp->mnt_op = vfsp->vfc_vfsops; |
| 301 | mp->mnt_vfc = vfsp; |
| 302 | vfsp->vfc_refcount++; |
| 303 | mp->mnt_stat.f_type = vfsp->vfc_typenum; |
| 304 | mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; |
| 305 | strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); |
| 306 | mp->mnt_vnodecovered = vp; |
| 307 | mp->mnt_stat.f_owner = cred->cr_uid; |
| 308 | mp->mnt_iosize_max = DFLTPHYS; |
| 309 | VOP_UNLOCK(vp, 0); |
| 310 | update: |
| 311 | /* |
| 312 | * Set the mount level flags. |
| 313 | */ |
| 314 | if (uap->flags & MNT_RDONLY) |
| 315 | mp->mnt_flag |= MNT_RDONLY; |
| 316 | else if (mp->mnt_flag & MNT_RDONLY) |
| 317 | mp->mnt_kern_flag |= MNTK_WANTRDWR; |
| 318 | mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | |
| 319 | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOATIME | |
| 320 | MNT_NOSYMFOLLOW | MNT_IGNORE | |
| 321 | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR); |
| 322 | mp->mnt_flag |= uap->flags & (MNT_NOSUID | MNT_NOEXEC | |
| 323 | MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE | |
| 324 | MNT_NOSYMFOLLOW | MNT_IGNORE | |
| 325 | MNT_NOATIME | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR); |
| 326 | /* |
| 327 | * Mount the filesystem. |
| 328 | * XXX The final recipients of VFS_MOUNT just overwrite the ndp they |
| 329 | * get. |
| 330 | */ |
| 331 | error = VFS_MOUNT(mp, uap->path, uap->data, cred); |
| 332 | if (mp->mnt_flag & MNT_UPDATE) { |
| 333 | if (mp->mnt_kern_flag & MNTK_WANTRDWR) |
| 334 | mp->mnt_flag &= ~MNT_RDONLY; |
| 335 | mp->mnt_flag &=~ (MNT_UPDATE | MNT_RELOAD | MNT_FORCE); |
| 336 | mp->mnt_kern_flag &=~ MNTK_WANTRDWR; |
| 337 | if (error) { |
| 338 | mp->mnt_flag = flag; |
| 339 | mp->mnt_kern_flag = flag2; |
| 340 | } |
| 341 | vfs_unbusy(mp); |
| 342 | vp->v_flag &= ~VMOUNT; |
| 343 | vrele(vp); |
| 344 | cache_drop(ncp); |
| 345 | return (error); |
| 346 | } |
| 347 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 348 | /* |
| 349 | * Put the new filesystem on the mount list after root. The mount |
| 350 | * point gets its own mnt_ncp which is a special ncp linking the |
| 351 | * vnode-under to the root of the new mount. The lookup code |
| 352 | * detects the mount point going forward and detects the special |
| 353 | * mnt_ncp via NCP_MOUNTPT going backwards. |
| 354 | * |
| 355 | * It is not necessary to invalidate or purge the vnode underneath |
| 356 | * because elements under the mount will be given their own glue |
| 357 | * namecache record. |
| 358 | */ |
| 359 | if (!error) { |
| 360 | nlc.nlc_nameptr = ""; |
| 361 | nlc.nlc_namelen = 0; |
| 362 | mp->mnt_ncp = cache_nlookup(ncp, &nlc); |
| 363 | cache_setunresolved(mp->mnt_ncp); |
| 364 | mp->mnt_ncp->nc_flag |= NCF_MOUNTPT; |
| 365 | mp->mnt_ncp->nc_mount = mp; |
| 366 | cache_drop(ncp); |
| 367 | /* XXX get the root of the fs and cache_setvp(mnt_ncp...) */ |
| 368 | vp->v_flag &= ~VMOUNT; |
| 369 | vp->v_mountedhere = mp; |
| 370 | mountlist_insert(mp, MNTINS_LAST); |
| 371 | checkdirs(vp, mp->mnt_ncp); |
| 372 | cache_unlock(mp->mnt_ncp); /* leave ref intact */ |
| 373 | VOP_UNLOCK(vp, 0); |
| 374 | error = vfs_allocate_syncvnode(mp); |
| 375 | vfs_unbusy(mp); |
| 376 | if ((error = VFS_START(mp, 0)) != 0) |
| 377 | vrele(vp); |
| 378 | } else { |
| 379 | vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_coherency_ops); |
| 380 | vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_journal_ops); |
| 381 | vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_norm_ops); |
| 382 | vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_spec_ops); |
| 383 | vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_fifo_ops); |
| 384 | vp->v_flag &= ~VMOUNT; |
| 385 | mp->mnt_vfc->vfc_refcount--; |
| 386 | vfs_unbusy(mp); |
| 387 | free(mp, M_MOUNT); |
| 388 | cache_drop(ncp); |
| 389 | vput(vp); |
| 390 | } |
| 391 | return (error); |
| 392 | } |
| 393 | |
| 394 | /* |
| 395 | * Scan all active processes to see if any of them have a current |
| 396 | * or root directory onto which the new filesystem has just been |
| 397 | * mounted. If so, replace them with the new mount point. |
| 398 | * |
| 399 | * The passed ncp is ref'd and locked (from the mount code) and |
| 400 | * must be associated with the vnode representing the root of the |
| 401 | * mount point. |
| 402 | */ |
| 403 | struct checkdirs_info { |
| 404 | struct vnode *olddp; |
| 405 | struct vnode *newdp; |
| 406 | struct namecache *ncp; |
| 407 | }; |
| 408 | |
| 409 | static int checkdirs_callback(struct proc *p, void *data); |
| 410 | |
| 411 | static void |
| 412 | checkdirs(struct vnode *olddp, struct namecache *ncp) |
| 413 | { |
| 414 | struct checkdirs_info info; |
| 415 | struct vnode *newdp; |
| 416 | struct mount *mp; |
| 417 | |
| 418 | if (olddp->v_usecount == 1) |
| 419 | return; |
| 420 | mp = olddp->v_mountedhere; |
| 421 | if (VFS_ROOT(mp, &newdp)) |
| 422 | panic("mount: lost mount"); |
| 423 | cache_setvp(ncp, newdp); |
| 424 | |
| 425 | if (rootvnode == olddp) { |
| 426 | vref(newdp); |
| 427 | vfs_cache_setroot(newdp, cache_hold(ncp)); |
| 428 | } |
| 429 | |
| 430 | info.olddp = olddp; |
| 431 | info.newdp = newdp; |
| 432 | info.ncp = ncp; |
| 433 | allproc_scan(checkdirs_callback, &info); |
| 434 | vput(newdp); |
| 435 | } |
| 436 | |
| 437 | /* |
| 438 | * NOTE: callback is not MP safe because the scanned process's filedesc |
| 439 | * structure can be ripped out from under us, amoung other things. |
| 440 | */ |
| 441 | static int |
| 442 | checkdirs_callback(struct proc *p, void *data) |
| 443 | { |
| 444 | struct checkdirs_info *info = data; |
| 445 | struct filedesc *fdp; |
| 446 | struct namecache *ncdrop1; |
| 447 | struct namecache *ncdrop2; |
| 448 | struct vnode *vprele1; |
| 449 | struct vnode *vprele2; |
| 450 | |
| 451 | if ((fdp = p->p_fd) != NULL) { |
| 452 | ncdrop1 = NULL; |
| 453 | ncdrop2 = NULL; |
| 454 | vprele1 = NULL; |
| 455 | vprele2 = NULL; |
| 456 | |
| 457 | /* |
| 458 | * MPUNSAFE - XXX fdp can be pulled out from under a |
| 459 | * foreign process. |
| 460 | * |
| 461 | * A shared filedesc is ok, we don't have to copy it |
| 462 | * because we are making this change globally. |
| 463 | */ |
| 464 | spin_lock_wr(&fdp->fd_spin); |
| 465 | if (fdp->fd_cdir == info->olddp) { |
| 466 | vprele1 = fdp->fd_cdir; |
| 467 | vref(info->newdp); |
| 468 | fdp->fd_cdir = info->newdp; |
| 469 | ncdrop1 = fdp->fd_ncdir; |
| 470 | fdp->fd_ncdir = cache_hold(info->ncp); |
| 471 | } |
| 472 | if (fdp->fd_rdir == info->olddp) { |
| 473 | vprele2 = fdp->fd_rdir; |
| 474 | vref(info->newdp); |
| 475 | fdp->fd_rdir = info->newdp; |
| 476 | ncdrop2 = fdp->fd_nrdir; |
| 477 | fdp->fd_nrdir = cache_hold(info->ncp); |
| 478 | } |
| 479 | spin_unlock_wr(&fdp->fd_spin); |
| 480 | if (ncdrop1) |
| 481 | cache_drop(ncdrop1); |
| 482 | if (ncdrop2) |
| 483 | cache_drop(ncdrop2); |
| 484 | if (vprele1) |
| 485 | vrele(vprele1); |
| 486 | if (vprele2) |
| 487 | vrele(vprele2); |
| 488 | } |
| 489 | return(0); |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * Unmount a file system. |
| 494 | * |
| 495 | * Note: unmount takes a path to the vnode mounted on as argument, |
| 496 | * not special file (as before). |
| 497 | */ |
| 498 | /* |
| 499 | * umount_args(char *path, int flags) |
| 500 | */ |
| 501 | /* ARGSUSED */ |
| 502 | int |
| 503 | sys_unmount(struct unmount_args *uap) |
| 504 | { |
| 505 | struct thread *td = curthread; |
| 506 | struct proc *p = td->td_proc; |
| 507 | struct mount *mp = NULL; |
| 508 | int error; |
| 509 | struct nlookupdata nd; |
| 510 | |
| 511 | KKASSERT(p); |
| 512 | if (p->p_ucred->cr_prison != NULL) |
| 513 | return (EPERM); |
| 514 | if (usermount == 0 && (error = suser(td))) |
| 515 | return (error); |
| 516 | |
| 517 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 518 | if (error == 0) |
| 519 | error = nlookup(&nd); |
| 520 | if (error) |
| 521 | goto out; |
| 522 | |
| 523 | mp = nd.nl_ncp->nc_mount; |
| 524 | |
| 525 | /* |
| 526 | * Only root, or the user that did the original mount is |
| 527 | * permitted to unmount this filesystem. |
| 528 | */ |
| 529 | if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && |
| 530 | (error = suser(td))) |
| 531 | goto out; |
| 532 | |
| 533 | /* |
| 534 | * Don't allow unmounting the root file system. |
| 535 | */ |
| 536 | if (mp->mnt_flag & MNT_ROOTFS) { |
| 537 | error = EINVAL; |
| 538 | goto out; |
| 539 | } |
| 540 | |
| 541 | /* |
| 542 | * Must be the root of the filesystem |
| 543 | */ |
| 544 | if (! (nd.nl_ncp->nc_flag & NCF_MOUNTPT)) { |
| 545 | error = EINVAL; |
| 546 | goto out; |
| 547 | } |
| 548 | |
| 549 | out: |
| 550 | nlookup_done(&nd); |
| 551 | if (error) |
| 552 | return (error); |
| 553 | return (dounmount(mp, uap->flags)); |
| 554 | } |
| 555 | |
| 556 | /* |
| 557 | * Do the actual file system unmount. |
| 558 | */ |
| 559 | static int |
| 560 | dounmount_interlock(struct mount *mp) |
| 561 | { |
| 562 | if (mp->mnt_kern_flag & MNTK_UNMOUNT) |
| 563 | return (EBUSY); |
| 564 | mp->mnt_kern_flag |= MNTK_UNMOUNT; |
| 565 | return(0); |
| 566 | } |
| 567 | |
| 568 | int |
| 569 | dounmount(struct mount *mp, int flags) |
| 570 | { |
| 571 | struct vnode *coveredvp; |
| 572 | int error; |
| 573 | int async_flag; |
| 574 | int lflags; |
| 575 | |
| 576 | /* |
| 577 | * Exclusive access for unmounting purposes |
| 578 | */ |
| 579 | if ((error = mountlist_interlock(dounmount_interlock, mp)) != 0) |
| 580 | return (error); |
| 581 | |
| 582 | /* |
| 583 | * Allow filesystems to detect that a forced unmount is in progress. |
| 584 | */ |
| 585 | if (flags & MNT_FORCE) |
| 586 | mp->mnt_kern_flag |= MNTK_UNMOUNTF; |
| 587 | lflags = LK_EXCLUSIVE | ((flags & MNT_FORCE) ? 0 : LK_NOWAIT); |
| 588 | error = lockmgr(&mp->mnt_lock, lflags); |
| 589 | if (error) { |
| 590 | mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); |
| 591 | if (mp->mnt_kern_flag & MNTK_MWAIT) |
| 592 | wakeup(mp); |
| 593 | return (error); |
| 594 | } |
| 595 | |
| 596 | if (mp->mnt_flag & MNT_EXPUBLIC) |
| 597 | vfs_setpublicfs(NULL, NULL, NULL); |
| 598 | |
| 599 | vfs_msync(mp, MNT_WAIT); |
| 600 | async_flag = mp->mnt_flag & MNT_ASYNC; |
| 601 | mp->mnt_flag &=~ MNT_ASYNC; |
| 602 | cache_purgevfs(mp); /* remove cache entries for this file sys */ |
| 603 | if (mp->mnt_syncer != NULL) |
| 604 | vrele(mp->mnt_syncer); |
| 605 | if (((mp->mnt_flag & MNT_RDONLY) || |
| 606 | (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || |
| 607 | (flags & MNT_FORCE)) |
| 608 | error = VFS_UNMOUNT(mp, flags); |
| 609 | if (error) { |
| 610 | if (mp->mnt_syncer == NULL) |
| 611 | vfs_allocate_syncvnode(mp); |
| 612 | mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); |
| 613 | mp->mnt_flag |= async_flag; |
| 614 | lockmgr(&mp->mnt_lock, LK_RELEASE); |
| 615 | if (mp->mnt_kern_flag & MNTK_MWAIT) |
| 616 | wakeup(mp); |
| 617 | return (error); |
| 618 | } |
| 619 | /* |
| 620 | * Clean up any journals still associated with the mount after |
| 621 | * filesystem activity has ceased. |
| 622 | */ |
| 623 | journal_remove_all_journals(mp, |
| 624 | ((flags & MNT_FORCE) ? MC_JOURNAL_STOP_IMM : 0)); |
| 625 | |
| 626 | mountlist_remove(mp); |
| 627 | |
| 628 | /* |
| 629 | * Remove any installed vnode ops here so the individual VFSs don't |
| 630 | * have to. |
| 631 | */ |
| 632 | vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_coherency_ops); |
| 633 | vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_journal_ops); |
| 634 | vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_norm_ops); |
| 635 | vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_spec_ops); |
| 636 | vfs_rm_vnodeops(mp, NULL, &mp->mnt_vn_fifo_ops); |
| 637 | |
| 638 | if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { |
| 639 | coveredvp->v_mountedhere = NULL; |
| 640 | vrele(coveredvp); |
| 641 | cache_drop(mp->mnt_ncp); |
| 642 | mp->mnt_ncp = NULL; |
| 643 | } |
| 644 | mp->mnt_vfc->vfc_refcount--; |
| 645 | if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) |
| 646 | panic("unmount: dangling vnode"); |
| 647 | lockmgr(&mp->mnt_lock, LK_RELEASE); |
| 648 | if (mp->mnt_kern_flag & MNTK_MWAIT) |
| 649 | wakeup(mp); |
| 650 | free(mp, M_MOUNT); |
| 651 | return (0); |
| 652 | } |
| 653 | |
| 654 | /* |
| 655 | * Sync each mounted filesystem. |
| 656 | */ |
| 657 | |
| 658 | #ifdef DEBUG |
| 659 | static int syncprt = 0; |
| 660 | SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, ""); |
| 661 | #endif /* DEBUG */ |
| 662 | |
| 663 | static int sync_callback(struct mount *mp, void *data); |
| 664 | |
| 665 | /* ARGSUSED */ |
| 666 | int |
| 667 | sys_sync(struct sync_args *uap) |
| 668 | { |
| 669 | mountlist_scan(sync_callback, NULL, MNTSCAN_FORWARD); |
| 670 | #ifdef DEBUG |
| 671 | /* |
| 672 | * print out buffer pool stat information on each sync() call. |
| 673 | */ |
| 674 | if (syncprt) |
| 675 | vfs_bufstats(); |
| 676 | #endif /* DEBUG */ |
| 677 | return (0); |
| 678 | } |
| 679 | |
| 680 | static |
| 681 | int |
| 682 | sync_callback(struct mount *mp, void *data __unused) |
| 683 | { |
| 684 | int asyncflag; |
| 685 | |
| 686 | if ((mp->mnt_flag & MNT_RDONLY) == 0) { |
| 687 | asyncflag = mp->mnt_flag & MNT_ASYNC; |
| 688 | mp->mnt_flag &= ~MNT_ASYNC; |
| 689 | vfs_msync(mp, MNT_NOWAIT); |
| 690 | VFS_SYNC(mp, MNT_NOWAIT); |
| 691 | mp->mnt_flag |= asyncflag; |
| 692 | } |
| 693 | return(0); |
| 694 | } |
| 695 | |
| 696 | /* XXX PRISON: could be per prison flag */ |
| 697 | static int prison_quotas; |
| 698 | #if 0 |
| 699 | SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, ""); |
| 700 | #endif |
| 701 | |
| 702 | /* |
| 703 | * quotactl_args(char *path, int fcmd, int uid, caddr_t arg) |
| 704 | * |
| 705 | * Change filesystem quotas. |
| 706 | */ |
| 707 | /* ARGSUSED */ |
| 708 | int |
| 709 | sys_quotactl(struct quotactl_args *uap) |
| 710 | { |
| 711 | struct nlookupdata nd; |
| 712 | struct thread *td; |
| 713 | struct proc *p; |
| 714 | struct mount *mp; |
| 715 | int error; |
| 716 | |
| 717 | td = curthread; |
| 718 | p = td->td_proc; |
| 719 | if (p->p_ucred->cr_prison && !prison_quotas) |
| 720 | return (EPERM); |
| 721 | |
| 722 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 723 | if (error == 0) |
| 724 | error = nlookup(&nd); |
| 725 | if (error == 0) { |
| 726 | mp = nd.nl_ncp->nc_mount; |
| 727 | error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, |
| 728 | uap->arg, nd.nl_cred); |
| 729 | } |
| 730 | nlookup_done(&nd); |
| 731 | return (error); |
| 732 | } |
| 733 | |
| 734 | /* |
| 735 | * mountctl(char *path, int op, int fd, const void *ctl, int ctllen, |
| 736 | * void *buf, int buflen) |
| 737 | * |
| 738 | * This function operates on a mount point and executes the specified |
| 739 | * operation using the specified control data, and possibly returns data. |
| 740 | * |
| 741 | * The actual number of bytes stored in the result buffer is returned, 0 |
| 742 | * if none, otherwise an error is returned. |
| 743 | */ |
| 744 | /* ARGSUSED */ |
| 745 | int |
| 746 | sys_mountctl(struct mountctl_args *uap) |
| 747 | { |
| 748 | struct thread *td = curthread; |
| 749 | struct proc *p = td->td_proc; |
| 750 | struct file *fp; |
| 751 | void *ctl = NULL; |
| 752 | void *buf = NULL; |
| 753 | char *path = NULL; |
| 754 | int error; |
| 755 | |
| 756 | /* |
| 757 | * Sanity and permissions checks. We must be root. |
| 758 | */ |
| 759 | KKASSERT(p); |
| 760 | if (p->p_ucred->cr_prison != NULL) |
| 761 | return (EPERM); |
| 762 | if ((error = suser(td)) != 0) |
| 763 | return (error); |
| 764 | |
| 765 | /* |
| 766 | * Argument length checks |
| 767 | */ |
| 768 | if (uap->ctllen < 0 || uap->ctllen > 1024) |
| 769 | return (EINVAL); |
| 770 | if (uap->buflen < 0 || uap->buflen > 16 * 1024) |
| 771 | return (EINVAL); |
| 772 | if (uap->path == NULL) |
| 773 | return (EINVAL); |
| 774 | |
| 775 | /* |
| 776 | * Allocate the necessary buffers and copyin data |
| 777 | */ |
| 778 | path = objcache_get(namei_oc, M_WAITOK); |
| 779 | error = copyinstr(uap->path, path, MAXPATHLEN, NULL); |
| 780 | if (error) |
| 781 | goto done; |
| 782 | |
| 783 | if (uap->ctllen) { |
| 784 | ctl = malloc(uap->ctllen + 1, M_TEMP, M_WAITOK|M_ZERO); |
| 785 | error = copyin(uap->ctl, ctl, uap->ctllen); |
| 786 | if (error) |
| 787 | goto done; |
| 788 | } |
| 789 | if (uap->buflen) |
| 790 | buf = malloc(uap->buflen + 1, M_TEMP, M_WAITOK|M_ZERO); |
| 791 | |
| 792 | /* |
| 793 | * Validate the descriptor |
| 794 | */ |
| 795 | fp = holdfp(p->p_fd, uap->fd, -1); |
| 796 | if (fp == NULL) { |
| 797 | error = EBADF; |
| 798 | goto done; |
| 799 | } |
| 800 | |
| 801 | /* |
| 802 | * Execute the internal kernel function and clean up. |
| 803 | */ |
| 804 | error = kern_mountctl(path, uap->op, fp, ctl, uap->ctllen, buf, uap->buflen, &uap->sysmsg_result); |
| 805 | if (fp) |
| 806 | fdrop(fp); |
| 807 | if (error == 0 && uap->sysmsg_result > 0) |
| 808 | error = copyout(buf, uap->buf, uap->sysmsg_result); |
| 809 | done: |
| 810 | if (path) |
| 811 | objcache_put(namei_oc, path); |
| 812 | if (ctl) |
| 813 | free(ctl, M_TEMP); |
| 814 | if (buf) |
| 815 | free(buf, M_TEMP); |
| 816 | return (error); |
| 817 | } |
| 818 | |
| 819 | /* |
| 820 | * Execute a mount control operation by resolving the path to a mount point |
| 821 | * and calling vop_mountctl(). |
| 822 | */ |
| 823 | int |
| 824 | kern_mountctl(const char *path, int op, struct file *fp, |
| 825 | const void *ctl, int ctllen, |
| 826 | void *buf, int buflen, int *res) |
| 827 | { |
| 828 | struct vnode *vp; |
| 829 | struct mount *mp; |
| 830 | struct nlookupdata nd; |
| 831 | int error; |
| 832 | |
| 833 | *res = 0; |
| 834 | vp = NULL; |
| 835 | error = nlookup_init(&nd, path, UIO_SYSSPACE, NLC_FOLLOW); |
| 836 | if (error == 0) |
| 837 | error = nlookup(&nd); |
| 838 | if (error == 0) |
| 839 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 840 | nlookup_done(&nd); |
| 841 | if (error) |
| 842 | return (error); |
| 843 | |
| 844 | mp = vp->v_mount; |
| 845 | |
| 846 | /* |
| 847 | * Must be the root of the filesystem |
| 848 | */ |
| 849 | if ((vp->v_flag & VROOT) == 0) { |
| 850 | vput(vp); |
| 851 | return (EINVAL); |
| 852 | } |
| 853 | error = vop_mountctl(mp->mnt_vn_use_ops, op, fp, ctl, ctllen, |
| 854 | buf, buflen, res); |
| 855 | vput(vp); |
| 856 | return (error); |
| 857 | } |
| 858 | |
| 859 | int |
| 860 | kern_statfs(struct nlookupdata *nd, struct statfs *buf) |
| 861 | { |
| 862 | struct thread *td = curthread; |
| 863 | struct proc *p = td->td_proc; |
| 864 | struct mount *mp; |
| 865 | struct statfs *sp; |
| 866 | char *fullpath, *freepath; |
| 867 | int error; |
| 868 | |
| 869 | if ((error = nlookup(nd)) != 0) |
| 870 | return (error); |
| 871 | mp = nd->nl_ncp->nc_mount; |
| 872 | sp = &mp->mnt_stat; |
| 873 | if ((error = VFS_STATFS(mp, sp, nd->nl_cred)) != 0) |
| 874 | return (error); |
| 875 | |
| 876 | error = cache_fullpath(p, mp->mnt_ncp, &fullpath, &freepath); |
| 877 | if (error) |
| 878 | return(error); |
| 879 | bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); |
| 880 | strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); |
| 881 | free(freepath, M_TEMP); |
| 882 | |
| 883 | sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; |
| 884 | bcopy(sp, buf, sizeof(*buf)); |
| 885 | /* Only root should have access to the fsid's. */ |
| 886 | if (suser(td)) |
| 887 | buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; |
| 888 | return (0); |
| 889 | } |
| 890 | |
| 891 | /* |
| 892 | * statfs_args(char *path, struct statfs *buf) |
| 893 | * |
| 894 | * Get filesystem statistics. |
| 895 | */ |
| 896 | int |
| 897 | sys_statfs(struct statfs_args *uap) |
| 898 | { |
| 899 | struct nlookupdata nd; |
| 900 | struct statfs buf; |
| 901 | int error; |
| 902 | |
| 903 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 904 | if (error == 0) |
| 905 | error = kern_statfs(&nd, &buf); |
| 906 | nlookup_done(&nd); |
| 907 | if (error == 0) |
| 908 | error = copyout(&buf, uap->buf, sizeof(*uap->buf)); |
| 909 | return (error); |
| 910 | } |
| 911 | |
| 912 | int |
| 913 | kern_fstatfs(int fd, struct statfs *buf) |
| 914 | { |
| 915 | struct thread *td = curthread; |
| 916 | struct proc *p = td->td_proc; |
| 917 | struct file *fp; |
| 918 | struct mount *mp; |
| 919 | struct statfs *sp; |
| 920 | char *fullpath, *freepath; |
| 921 | int error; |
| 922 | |
| 923 | KKASSERT(p); |
| 924 | if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) |
| 925 | return (error); |
| 926 | mp = ((struct vnode *)fp->f_data)->v_mount; |
| 927 | if (mp == NULL) { |
| 928 | error = EBADF; |
| 929 | goto done; |
| 930 | } |
| 931 | if (fp->f_cred == NULL) { |
| 932 | error = EINVAL; |
| 933 | goto done; |
| 934 | } |
| 935 | sp = &mp->mnt_stat; |
| 936 | if ((error = VFS_STATFS(mp, sp, fp->f_cred)) != 0) |
| 937 | goto done; |
| 938 | |
| 939 | if ((error = cache_fullpath(p, mp->mnt_ncp, &fullpath, &freepath)) != 0) |
| 940 | goto done; |
| 941 | bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); |
| 942 | strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); |
| 943 | free(freepath, M_TEMP); |
| 944 | |
| 945 | sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; |
| 946 | bcopy(sp, buf, sizeof(*buf)); |
| 947 | |
| 948 | /* Only root should have access to the fsid's. */ |
| 949 | if (suser(td)) |
| 950 | buf->f_fsid.val[0] = buf->f_fsid.val[1] = 0; |
| 951 | error = 0; |
| 952 | done: |
| 953 | fdrop(fp); |
| 954 | return (error); |
| 955 | } |
| 956 | |
| 957 | /* |
| 958 | * fstatfs_args(int fd, struct statfs *buf) |
| 959 | * |
| 960 | * Get filesystem statistics. |
| 961 | */ |
| 962 | int |
| 963 | sys_fstatfs(struct fstatfs_args *uap) |
| 964 | { |
| 965 | struct statfs buf; |
| 966 | int error; |
| 967 | |
| 968 | error = kern_fstatfs(uap->fd, &buf); |
| 969 | |
| 970 | if (error == 0) |
| 971 | error = copyout(&buf, uap->buf, sizeof(*uap->buf)); |
| 972 | return (error); |
| 973 | } |
| 974 | |
| 975 | /* |
| 976 | * getfsstat_args(struct statfs *buf, long bufsize, int flags) |
| 977 | * |
| 978 | * Get statistics on all filesystems. |
| 979 | */ |
| 980 | |
| 981 | struct getfsstat_info { |
| 982 | struct statfs *sfsp; |
| 983 | long count; |
| 984 | long maxcount; |
| 985 | int error; |
| 986 | int flags; |
| 987 | int is_chrooted; |
| 988 | struct proc *p; |
| 989 | }; |
| 990 | |
| 991 | static int getfsstat_callback(struct mount *, void *); |
| 992 | |
| 993 | /* ARGSUSED */ |
| 994 | int |
| 995 | sys_getfsstat(struct getfsstat_args *uap) |
| 996 | { |
| 997 | struct thread *td = curthread; |
| 998 | struct proc *p = td->td_proc; |
| 999 | struct getfsstat_info info; |
| 1000 | |
| 1001 | bzero(&info, sizeof(info)); |
| 1002 | if (p != NULL && (p->p_fd->fd_nrdir->nc_flag & NCF_ROOT) == 0) |
| 1003 | info.is_chrooted = 1; |
| 1004 | else |
| 1005 | info.is_chrooted = 0; |
| 1006 | |
| 1007 | info.maxcount = uap->bufsize / sizeof(struct statfs); |
| 1008 | info.sfsp = uap->buf; |
| 1009 | info.count = 0; |
| 1010 | info.flags = uap->flags; |
| 1011 | info.p = p; |
| 1012 | |
| 1013 | mountlist_scan(getfsstat_callback, &info, MNTSCAN_FORWARD); |
| 1014 | if (info.sfsp && info.count > info.maxcount) |
| 1015 | uap->sysmsg_result = info.maxcount; |
| 1016 | else |
| 1017 | uap->sysmsg_result = info.count; |
| 1018 | return (info.error); |
| 1019 | } |
| 1020 | |
| 1021 | static int |
| 1022 | getfsstat_callback(struct mount *mp, void *data) |
| 1023 | { |
| 1024 | struct getfsstat_info *info = data; |
| 1025 | struct statfs *sp; |
| 1026 | char *freepath; |
| 1027 | char *fullpath; |
| 1028 | int error; |
| 1029 | |
| 1030 | if (info->sfsp && info->count < info->maxcount) { |
| 1031 | if (info->is_chrooted && !chroot_visible_mnt(mp, info->p)) |
| 1032 | return(0); |
| 1033 | sp = &mp->mnt_stat; |
| 1034 | |
| 1035 | /* |
| 1036 | * If MNT_NOWAIT or MNT_LAZY is specified, do not |
| 1037 | * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY |
| 1038 | * overrides MNT_WAIT. |
| 1039 | */ |
| 1040 | if (((info->flags & (MNT_LAZY|MNT_NOWAIT)) == 0 || |
| 1041 | (info->flags & MNT_WAIT)) && |
| 1042 | (error = VFS_STATFS(mp, sp, info->p->p_ucred))) { |
| 1043 | return(0); |
| 1044 | } |
| 1045 | sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; |
| 1046 | |
| 1047 | error = cache_fullpath(info->p, mp->mnt_ncp, |
| 1048 | &fullpath, &freepath); |
| 1049 | if (error) { |
| 1050 | info->error = error; |
| 1051 | return(-1); |
| 1052 | } |
| 1053 | bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); |
| 1054 | strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); |
| 1055 | free(freepath, M_TEMP); |
| 1056 | |
| 1057 | error = copyout(sp, info->sfsp, sizeof(*sp)); |
| 1058 | if (error) { |
| 1059 | info->error = error; |
| 1060 | return (-1); |
| 1061 | } |
| 1062 | ++info->sfsp; |
| 1063 | } |
| 1064 | info->count++; |
| 1065 | return(0); |
| 1066 | } |
| 1067 | |
| 1068 | /* |
| 1069 | * fchdir_args(int fd) |
| 1070 | * |
| 1071 | * Change current working directory to a given file descriptor. |
| 1072 | */ |
| 1073 | /* ARGSUSED */ |
| 1074 | int |
| 1075 | sys_fchdir(struct fchdir_args *uap) |
| 1076 | { |
| 1077 | struct thread *td = curthread; |
| 1078 | struct proc *p = td->td_proc; |
| 1079 | struct filedesc *fdp = p->p_fd; |
| 1080 | struct vnode *vp, *ovp; |
| 1081 | struct mount *mp; |
| 1082 | struct file *fp; |
| 1083 | struct namecache *ncp, *oncp; |
| 1084 | struct namecache *nct; |
| 1085 | int error; |
| 1086 | |
| 1087 | if ((error = holdvnode(fdp, uap->fd, &fp)) != 0) |
| 1088 | return (error); |
| 1089 | vp = (struct vnode *)fp->f_data; |
| 1090 | vref(vp); |
| 1091 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 1092 | if (vp->v_type != VDIR || fp->f_ncp == NULL) |
| 1093 | error = ENOTDIR; |
| 1094 | else |
| 1095 | error = VOP_ACCESS(vp, VEXEC, p->p_ucred); |
| 1096 | if (error) { |
| 1097 | vput(vp); |
| 1098 | fdrop(fp); |
| 1099 | return (error); |
| 1100 | } |
| 1101 | ncp = cache_hold(fp->f_ncp); |
| 1102 | while (!error && (mp = vp->v_mountedhere) != NULL) { |
| 1103 | error = nlookup_mp(mp, &nct); |
| 1104 | if (error == 0) { |
| 1105 | cache_unlock(nct); /* leave ref intact */ |
| 1106 | vput(vp); |
| 1107 | vp = nct->nc_vp; |
| 1108 | error = vget(vp, LK_SHARED); |
| 1109 | KKASSERT(error == 0); |
| 1110 | cache_drop(ncp); |
| 1111 | ncp = nct; |
| 1112 | } |
| 1113 | } |
| 1114 | if (error == 0) { |
| 1115 | ovp = fdp->fd_cdir; |
| 1116 | oncp = fdp->fd_ncdir; |
| 1117 | VOP_UNLOCK(vp, 0); /* leave ref intact */ |
| 1118 | fdp->fd_cdir = vp; |
| 1119 | fdp->fd_ncdir = ncp; |
| 1120 | cache_drop(oncp); |
| 1121 | vrele(ovp); |
| 1122 | } else { |
| 1123 | cache_drop(ncp); |
| 1124 | vput(vp); |
| 1125 | } |
| 1126 | fdrop(fp); |
| 1127 | return (error); |
| 1128 | } |
| 1129 | |
| 1130 | int |
| 1131 | kern_chdir(struct nlookupdata *nd) |
| 1132 | { |
| 1133 | struct thread *td = curthread; |
| 1134 | struct proc *p = td->td_proc; |
| 1135 | struct filedesc *fdp = p->p_fd; |
| 1136 | struct vnode *vp, *ovp; |
| 1137 | struct namecache *oncp; |
| 1138 | int error; |
| 1139 | |
| 1140 | if ((error = nlookup(nd)) != 0) |
| 1141 | return (error); |
| 1142 | if ((vp = nd->nl_ncp->nc_vp) == NULL) |
| 1143 | return (ENOENT); |
| 1144 | if ((error = vget(vp, LK_SHARED)) != 0) |
| 1145 | return (error); |
| 1146 | |
| 1147 | error = checkvp_chdir(vp, td); |
| 1148 | VOP_UNLOCK(vp, 0); |
| 1149 | if (error == 0) { |
| 1150 | ovp = fdp->fd_cdir; |
| 1151 | oncp = fdp->fd_ncdir; |
| 1152 | cache_unlock(nd->nl_ncp); /* leave reference intact */ |
| 1153 | fdp->fd_ncdir = nd->nl_ncp; |
| 1154 | fdp->fd_cdir = vp; |
| 1155 | cache_drop(oncp); |
| 1156 | vrele(ovp); |
| 1157 | nd->nl_ncp = NULL; |
| 1158 | } else { |
| 1159 | vrele(vp); |
| 1160 | } |
| 1161 | return (error); |
| 1162 | } |
| 1163 | |
| 1164 | /* |
| 1165 | * chdir_args(char *path) |
| 1166 | * |
| 1167 | * Change current working directory (``.''). |
| 1168 | */ |
| 1169 | int |
| 1170 | sys_chdir(struct chdir_args *uap) |
| 1171 | { |
| 1172 | struct nlookupdata nd; |
| 1173 | int error; |
| 1174 | |
| 1175 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 1176 | if (error == 0) |
| 1177 | error = kern_chdir(&nd); |
| 1178 | nlookup_done(&nd); |
| 1179 | return (error); |
| 1180 | } |
| 1181 | |
| 1182 | /* |
| 1183 | * Helper function for raised chroot(2) security function: Refuse if |
| 1184 | * any filedescriptors are open directories. |
| 1185 | */ |
| 1186 | static int |
| 1187 | chroot_refuse_vdir_fds(fdp) |
| 1188 | struct filedesc *fdp; |
| 1189 | { |
| 1190 | struct vnode *vp; |
| 1191 | struct file *fp; |
| 1192 | int error; |
| 1193 | int fd; |
| 1194 | |
| 1195 | for (fd = 0; fd < fdp->fd_nfiles ; fd++) { |
| 1196 | if ((error = holdvnode(fdp, fd, &fp)) != 0) |
| 1197 | continue; |
| 1198 | vp = (struct vnode *)fp->f_data; |
| 1199 | if (vp->v_type != VDIR) { |
| 1200 | fdrop(fp); |
| 1201 | continue; |
| 1202 | } |
| 1203 | fdrop(fp); |
| 1204 | return(EPERM); |
| 1205 | } |
| 1206 | return (0); |
| 1207 | } |
| 1208 | |
| 1209 | /* |
| 1210 | * This sysctl determines if we will allow a process to chroot(2) if it |
| 1211 | * has a directory open: |
| 1212 | * 0: disallowed for all processes. |
| 1213 | * 1: allowed for processes that were not already chroot(2)'ed. |
| 1214 | * 2: allowed for all processes. |
| 1215 | */ |
| 1216 | |
| 1217 | static int chroot_allow_open_directories = 1; |
| 1218 | |
| 1219 | SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW, |
| 1220 | &chroot_allow_open_directories, 0, ""); |
| 1221 | |
| 1222 | /* |
| 1223 | * chroot to the specified namecache entry. We obtain the vp from the |
| 1224 | * namecache data. The passed ncp must be locked and referenced and will |
| 1225 | * remain locked and referenced on return. |
| 1226 | */ |
| 1227 | int |
| 1228 | kern_chroot(struct namecache *ncp) |
| 1229 | { |
| 1230 | struct thread *td = curthread; |
| 1231 | struct proc *p = td->td_proc; |
| 1232 | struct filedesc *fdp = p->p_fd; |
| 1233 | struct vnode *vp; |
| 1234 | int error; |
| 1235 | |
| 1236 | /* |
| 1237 | * Only root can chroot |
| 1238 | */ |
| 1239 | if ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0) |
| 1240 | return (error); |
| 1241 | |
| 1242 | /* |
| 1243 | * Disallow open directory descriptors (fchdir() breakouts). |
| 1244 | */ |
| 1245 | if (chroot_allow_open_directories == 0 || |
| 1246 | (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) { |
| 1247 | if ((error = chroot_refuse_vdir_fds(fdp)) != 0) |
| 1248 | return (error); |
| 1249 | } |
| 1250 | if ((vp = ncp->nc_vp) == NULL) |
| 1251 | return (ENOENT); |
| 1252 | |
| 1253 | if ((error = vget(vp, LK_SHARED)) != 0) |
| 1254 | return (error); |
| 1255 | |
| 1256 | /* |
| 1257 | * Check the validity of vp as a directory to change to and |
| 1258 | * associate it with rdir/jdir. |
| 1259 | */ |
| 1260 | error = checkvp_chdir(vp, td); |
| 1261 | VOP_UNLOCK(vp, 0); /* leave reference intact */ |
| 1262 | if (error == 0) { |
| 1263 | vrele(fdp->fd_rdir); |
| 1264 | fdp->fd_rdir = vp; /* reference inherited by fd_rdir */ |
| 1265 | cache_drop(fdp->fd_nrdir); |
| 1266 | fdp->fd_nrdir = cache_hold(ncp); |
| 1267 | if (fdp->fd_jdir == NULL) { |
| 1268 | fdp->fd_jdir = vp; |
| 1269 | vref(fdp->fd_jdir); |
| 1270 | fdp->fd_njdir = cache_hold(ncp); |
| 1271 | } |
| 1272 | } else { |
| 1273 | vrele(vp); |
| 1274 | } |
| 1275 | return (error); |
| 1276 | } |
| 1277 | |
| 1278 | /* |
| 1279 | * chroot_args(char *path) |
| 1280 | * |
| 1281 | * Change notion of root (``/'') directory. |
| 1282 | */ |
| 1283 | /* ARGSUSED */ |
| 1284 | int |
| 1285 | sys_chroot(struct chroot_args *uap) |
| 1286 | { |
| 1287 | struct thread *td = curthread; |
| 1288 | struct nlookupdata nd; |
| 1289 | int error; |
| 1290 | |
| 1291 | KKASSERT(td->td_proc); |
| 1292 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 1293 | if (error) { |
| 1294 | nlookup_done(&nd); |
| 1295 | return(error); |
| 1296 | } |
| 1297 | error = nlookup(&nd); |
| 1298 | if (error == 0) |
| 1299 | error = kern_chroot(nd.nl_ncp); |
| 1300 | nlookup_done(&nd); |
| 1301 | return(error); |
| 1302 | } |
| 1303 | |
| 1304 | /* |
| 1305 | * Common routine for chroot and chdir. Given a locked, referenced vnode, |
| 1306 | * determine whether it is legal to chdir to the vnode. The vnode's state |
| 1307 | * is not changed by this call. |
| 1308 | */ |
| 1309 | int |
| 1310 | checkvp_chdir(struct vnode *vp, struct thread *td) |
| 1311 | { |
| 1312 | int error; |
| 1313 | |
| 1314 | if (vp->v_type != VDIR) |
| 1315 | error = ENOTDIR; |
| 1316 | else |
| 1317 | error = VOP_ACCESS(vp, VEXEC, td->td_proc->p_ucred); |
| 1318 | return (error); |
| 1319 | } |
| 1320 | |
| 1321 | int |
| 1322 | kern_open(struct nlookupdata *nd, int oflags, int mode, int *res) |
| 1323 | { |
| 1324 | struct thread *td = curthread; |
| 1325 | struct proc *p = td->td_proc; |
| 1326 | struct lwp *lp = td->td_lwp; |
| 1327 | struct filedesc *fdp = p->p_fd; |
| 1328 | int cmode, flags; |
| 1329 | struct file *nfp; |
| 1330 | struct file *fp; |
| 1331 | struct vnode *vp; |
| 1332 | int type, indx, error; |
| 1333 | struct flock lf; |
| 1334 | |
| 1335 | if ((oflags & O_ACCMODE) == O_ACCMODE) |
| 1336 | return (EINVAL); |
| 1337 | flags = FFLAGS(oflags); |
| 1338 | error = falloc(p, &nfp, NULL); |
| 1339 | if (error) |
| 1340 | return (error); |
| 1341 | fp = nfp; |
| 1342 | cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; |
| 1343 | |
| 1344 | /* |
| 1345 | * XXX p_dupfd is a real mess. It allows a device to return a |
| 1346 | * file descriptor to be duplicated rather then doing the open |
| 1347 | * itself. |
| 1348 | */ |
| 1349 | lp->lwp_dupfd = -1; |
| 1350 | |
| 1351 | /* |
| 1352 | * Call vn_open() to do the lookup and assign the vnode to the |
| 1353 | * file pointer. vn_open() does not change the ref count on fp |
| 1354 | * and the vnode, on success, will be inherited by the file pointer |
| 1355 | * and unlocked. |
| 1356 | */ |
| 1357 | nd->nl_flags |= NLC_LOCKVP; |
| 1358 | error = vn_open(nd, fp, flags, cmode); |
| 1359 | nlookup_done(nd); |
| 1360 | if (error) { |
| 1361 | /* |
| 1362 | * handle special fdopen() case. bleh. dupfdopen() is |
| 1363 | * responsible for dropping the old contents of ofiles[indx] |
| 1364 | * if it succeeds. |
| 1365 | * |
| 1366 | * Note that fsetfd() will add a ref to fp which represents |
| 1367 | * the fd_files[] assignment. We must still drop our |
| 1368 | * reference. |
| 1369 | */ |
| 1370 | if ((error == ENODEV || error == ENXIO) && lp->lwp_dupfd >= 0) { |
| 1371 | if (fdalloc(p, 0, &indx) == 0) { |
| 1372 | error = dupfdopen(p, indx, lp->lwp_dupfd, flags, error); |
| 1373 | if (error == 0) { |
| 1374 | *res = indx; |
| 1375 | fdrop(fp); /* our ref */ |
| 1376 | return (0); |
| 1377 | } |
| 1378 | fsetfd(p, NULL, indx); |
| 1379 | } |
| 1380 | } |
| 1381 | fdrop(fp); /* our ref */ |
| 1382 | if (error == ERESTART) |
| 1383 | error = EINTR; |
| 1384 | return (error); |
| 1385 | } |
| 1386 | |
| 1387 | /* |
| 1388 | * ref the vnode for ourselves so it can't be ripped out from under |
| 1389 | * is. XXX need an ND flag to request that the vnode be returned |
| 1390 | * anyway. |
| 1391 | * |
| 1392 | * Reserve a file descriptor but do not assign it until the open |
| 1393 | * succeeds. |
| 1394 | */ |
| 1395 | vp = (struct vnode *)fp->f_data; |
| 1396 | vref(vp); |
| 1397 | if ((error = fdalloc(p, 0, &indx)) != 0) { |
| 1398 | fdrop(fp); |
| 1399 | vrele(vp); |
| 1400 | return (error); |
| 1401 | } |
| 1402 | |
| 1403 | /* |
| 1404 | * If no error occurs the vp will have been assigned to the file |
| 1405 | * pointer. |
| 1406 | */ |
| 1407 | lp->lwp_dupfd = 0; |
| 1408 | |
| 1409 | if (flags & (O_EXLOCK | O_SHLOCK)) { |
| 1410 | lf.l_whence = SEEK_SET; |
| 1411 | lf.l_start = 0; |
| 1412 | lf.l_len = 0; |
| 1413 | if (flags & O_EXLOCK) |
| 1414 | lf.l_type = F_WRLCK; |
| 1415 | else |
| 1416 | lf.l_type = F_RDLCK; |
| 1417 | if (flags & FNONBLOCK) |
| 1418 | type = 0; |
| 1419 | else |
| 1420 | type = F_WAIT; |
| 1421 | |
| 1422 | if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { |
| 1423 | /* |
| 1424 | * lock request failed. Clean up the reserved |
| 1425 | * descriptor. |
| 1426 | */ |
| 1427 | vrele(vp); |
| 1428 | fsetfd(p, NULL, indx); |
| 1429 | fdrop(fp); |
| 1430 | return (error); |
| 1431 | } |
| 1432 | fp->f_flag |= FHASLOCK; |
| 1433 | } |
| 1434 | #if 0 |
| 1435 | /* |
| 1436 | * Assert that all regular file vnodes were created with a object. |
| 1437 | */ |
| 1438 | KASSERT(vp->v_type != VREG || vp->v_object != NULL, |
| 1439 | ("open: regular file has no backing object after vn_open")); |
| 1440 | #endif |
| 1441 | |
| 1442 | vrele(vp); |
| 1443 | |
| 1444 | /* |
| 1445 | * release our private reference, leaving the one associated with the |
| 1446 | * descriptor table intact. |
| 1447 | */ |
| 1448 | fsetfd(p, fp, indx); |
| 1449 | fdrop(fp); |
| 1450 | *res = indx; |
| 1451 | return (0); |
| 1452 | } |
| 1453 | |
| 1454 | /* |
| 1455 | * open_args(char *path, int flags, int mode) |
| 1456 | * |
| 1457 | * Check permissions, allocate an open file structure, |
| 1458 | * and call the device open routine if any. |
| 1459 | */ |
| 1460 | int |
| 1461 | sys_open(struct open_args *uap) |
| 1462 | { |
| 1463 | struct nlookupdata nd; |
| 1464 | int error; |
| 1465 | |
| 1466 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 1467 | if (error == 0) { |
| 1468 | error = kern_open(&nd, uap->flags, |
| 1469 | uap->mode, &uap->sysmsg_result); |
| 1470 | } |
| 1471 | nlookup_done(&nd); |
| 1472 | return (error); |
| 1473 | } |
| 1474 | |
| 1475 | int |
| 1476 | kern_mknod(struct nlookupdata *nd, int mode, int dev) |
| 1477 | { |
| 1478 | struct namecache *ncp; |
| 1479 | struct thread *td = curthread; |
| 1480 | struct proc *p = td->td_proc; |
| 1481 | struct vnode *vp; |
| 1482 | struct vattr vattr; |
| 1483 | int error; |
| 1484 | int whiteout = 0; |
| 1485 | |
| 1486 | KKASSERT(p); |
| 1487 | |
| 1488 | switch (mode & S_IFMT) { |
| 1489 | case S_IFCHR: |
| 1490 | case S_IFBLK: |
| 1491 | error = suser(td); |
| 1492 | break; |
| 1493 | default: |
| 1494 | error = suser_cred(p->p_ucred, PRISON_ROOT); |
| 1495 | break; |
| 1496 | } |
| 1497 | if (error) |
| 1498 | return (error); |
| 1499 | |
| 1500 | bwillwrite(); |
| 1501 | nd->nl_flags |= NLC_CREATE; |
| 1502 | if ((error = nlookup(nd)) != 0) |
| 1503 | return (error); |
| 1504 | ncp = nd->nl_ncp; |
| 1505 | if (ncp->nc_vp) |
| 1506 | return (EEXIST); |
| 1507 | |
| 1508 | VATTR_NULL(&vattr); |
| 1509 | vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask; |
| 1510 | vattr.va_rdev = dev; |
| 1511 | whiteout = 0; |
| 1512 | |
| 1513 | switch (mode & S_IFMT) { |
| 1514 | case S_IFMT: /* used by badsect to flag bad sectors */ |
| 1515 | vattr.va_type = VBAD; |
| 1516 | break; |
| 1517 | case S_IFCHR: |
| 1518 | vattr.va_type = VCHR; |
| 1519 | break; |
| 1520 | case S_IFBLK: |
| 1521 | vattr.va_type = VBLK; |
| 1522 | break; |
| 1523 | case S_IFWHT: |
| 1524 | whiteout = 1; |
| 1525 | break; |
| 1526 | default: |
| 1527 | error = EINVAL; |
| 1528 | break; |
| 1529 | } |
| 1530 | if (error == 0) { |
| 1531 | if (whiteout) { |
| 1532 | error = VOP_NWHITEOUT(ncp, nd->nl_cred, NAMEI_CREATE); |
| 1533 | } else { |
| 1534 | vp = NULL; |
| 1535 | error = VOP_NMKNOD(ncp, &vp, nd->nl_cred, &vattr); |
| 1536 | if (error == 0) |
| 1537 | vput(vp); |
| 1538 | } |
| 1539 | } |
| 1540 | return (error); |
| 1541 | } |
| 1542 | |
| 1543 | /* |
| 1544 | * mknod_args(char *path, int mode, int dev) |
| 1545 | * |
| 1546 | * Create a special file. |
| 1547 | */ |
| 1548 | int |
| 1549 | sys_mknod(struct mknod_args *uap) |
| 1550 | { |
| 1551 | struct nlookupdata nd; |
| 1552 | int error; |
| 1553 | |
| 1554 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 1555 | if (error == 0) |
| 1556 | error = kern_mknod(&nd, uap->mode, uap->dev); |
| 1557 | nlookup_done(&nd); |
| 1558 | return (error); |
| 1559 | } |
| 1560 | |
| 1561 | int |
| 1562 | kern_mkfifo(struct nlookupdata *nd, int mode) |
| 1563 | { |
| 1564 | struct namecache *ncp; |
| 1565 | struct thread *td = curthread; |
| 1566 | struct proc *p = td->td_proc; |
| 1567 | struct vattr vattr; |
| 1568 | struct vnode *vp; |
| 1569 | int error; |
| 1570 | |
| 1571 | bwillwrite(); |
| 1572 | |
| 1573 | nd->nl_flags |= NLC_CREATE; |
| 1574 | if ((error = nlookup(nd)) != 0) |
| 1575 | return (error); |
| 1576 | ncp = nd->nl_ncp; |
| 1577 | if (ncp->nc_vp) |
| 1578 | return (EEXIST); |
| 1579 | |
| 1580 | VATTR_NULL(&vattr); |
| 1581 | vattr.va_type = VFIFO; |
| 1582 | vattr.va_mode = (mode & ALLPERMS) &~ p->p_fd->fd_cmask; |
| 1583 | vp = NULL; |
| 1584 | error = VOP_NMKNOD(ncp, &vp, nd->nl_cred, &vattr); |
| 1585 | if (error == 0) |
| 1586 | vput(vp); |
| 1587 | return (error); |
| 1588 | } |
| 1589 | |
| 1590 | /* |
| 1591 | * mkfifo_args(char *path, int mode) |
| 1592 | * |
| 1593 | * Create a named pipe. |
| 1594 | */ |
| 1595 | int |
| 1596 | sys_mkfifo(struct mkfifo_args *uap) |
| 1597 | { |
| 1598 | struct nlookupdata nd; |
| 1599 | int error; |
| 1600 | |
| 1601 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 1602 | if (error == 0) |
| 1603 | error = kern_mkfifo(&nd, uap->mode); |
| 1604 | nlookup_done(&nd); |
| 1605 | return (error); |
| 1606 | } |
| 1607 | |
| 1608 | static int hardlink_check_uid = 0; |
| 1609 | SYSCTL_INT(_kern, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, |
| 1610 | &hardlink_check_uid, 0, |
| 1611 | "Unprivileged processes cannot create hard links to files owned by other " |
| 1612 | "users"); |
| 1613 | static int hardlink_check_gid = 0; |
| 1614 | SYSCTL_INT(_kern, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, |
| 1615 | &hardlink_check_gid, 0, |
| 1616 | "Unprivileged processes cannot create hard links to files owned by other " |
| 1617 | "groups"); |
| 1618 | |
| 1619 | static int |
| 1620 | can_hardlink(struct vnode *vp, struct thread *td, struct ucred *cred) |
| 1621 | { |
| 1622 | struct vattr va; |
| 1623 | int error; |
| 1624 | |
| 1625 | /* |
| 1626 | * Shortcut if disabled |
| 1627 | */ |
| 1628 | if (hardlink_check_uid == 0 && hardlink_check_gid == 0) |
| 1629 | return (0); |
| 1630 | |
| 1631 | /* |
| 1632 | * root cred can always hardlink |
| 1633 | */ |
| 1634 | if (suser_cred(cred, PRISON_ROOT) == 0) |
| 1635 | return (0); |
| 1636 | |
| 1637 | /* |
| 1638 | * Otherwise only if the originating file is owned by the |
| 1639 | * same user or group. Note that any group is allowed if |
| 1640 | * the file is owned by the caller. |
| 1641 | */ |
| 1642 | error = VOP_GETATTR(vp, &va); |
| 1643 | if (error != 0) |
| 1644 | return (error); |
| 1645 | |
| 1646 | if (hardlink_check_uid) { |
| 1647 | if (cred->cr_uid != va.va_uid) |
| 1648 | return (EPERM); |
| 1649 | } |
| 1650 | |
| 1651 | if (hardlink_check_gid) { |
| 1652 | if (cred->cr_uid != va.va_uid && !groupmember(va.va_gid, cred)) |
| 1653 | return (EPERM); |
| 1654 | } |
| 1655 | |
| 1656 | return (0); |
| 1657 | } |
| 1658 | |
| 1659 | int |
| 1660 | kern_link(struct nlookupdata *nd, struct nlookupdata *linknd) |
| 1661 | { |
| 1662 | struct thread *td = curthread; |
| 1663 | struct vnode *vp; |
| 1664 | int error; |
| 1665 | |
| 1666 | /* |
| 1667 | * Lookup the source and obtained a locked vnode. |
| 1668 | * |
| 1669 | * XXX relookup on vget failure / race ? |
| 1670 | */ |
| 1671 | bwillwrite(); |
| 1672 | if ((error = nlookup(nd)) != 0) |
| 1673 | return (error); |
| 1674 | vp = nd->nl_ncp->nc_vp; |
| 1675 | KKASSERT(vp != NULL); |
| 1676 | if (vp->v_type == VDIR) |
| 1677 | return (EPERM); /* POSIX */ |
| 1678 | if ((error = vget(vp, LK_EXCLUSIVE)) != 0) |
| 1679 | return (error); |
| 1680 | |
| 1681 | /* |
| 1682 | * Unlock the source so we can lookup the target without deadlocking |
| 1683 | * (XXX vp is locked already, possible other deadlock?). The target |
| 1684 | * must not exist. |
| 1685 | */ |
| 1686 | KKASSERT(nd->nl_flags & NLC_NCPISLOCKED); |
| 1687 | nd->nl_flags &= ~NLC_NCPISLOCKED; |
| 1688 | cache_unlock(nd->nl_ncp); |
| 1689 | |
| 1690 | linknd->nl_flags |= NLC_CREATE; |
| 1691 | if ((error = nlookup(linknd)) != 0) { |
| 1692 | vput(vp); |
| 1693 | return (error); |
| 1694 | } |
| 1695 | if (linknd->nl_ncp->nc_vp) { |
| 1696 | vput(vp); |
| 1697 | return (EEXIST); |
| 1698 | } |
| 1699 | |
| 1700 | /* |
| 1701 | * Finally run the new API VOP. |
| 1702 | */ |
| 1703 | error = can_hardlink(vp, td, td->td_proc->p_ucred); |
| 1704 | if (error == 0) |
| 1705 | error = VOP_NLINK(linknd->nl_ncp, vp, linknd->nl_cred); |
| 1706 | vput(vp); |
| 1707 | return (error); |
| 1708 | } |
| 1709 | |
| 1710 | /* |
| 1711 | * link_args(char *path, char *link) |
| 1712 | * |
| 1713 | * Make a hard file link. |
| 1714 | */ |
| 1715 | int |
| 1716 | sys_link(struct link_args *uap) |
| 1717 | { |
| 1718 | struct nlookupdata nd, linknd; |
| 1719 | int error; |
| 1720 | |
| 1721 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 1722 | if (error == 0) { |
| 1723 | error = nlookup_init(&linknd, uap->link, UIO_USERSPACE, 0); |
| 1724 | if (error == 0) |
| 1725 | error = kern_link(&nd, &linknd); |
| 1726 | nlookup_done(&linknd); |
| 1727 | } |
| 1728 | nlookup_done(&nd); |
| 1729 | return (error); |
| 1730 | } |
| 1731 | |
| 1732 | int |
| 1733 | kern_symlink(struct nlookupdata *nd, char *path, int mode) |
| 1734 | { |
| 1735 | struct namecache *ncp; |
| 1736 | struct vattr vattr; |
| 1737 | struct vnode *vp; |
| 1738 | int error; |
| 1739 | |
| 1740 | bwillwrite(); |
| 1741 | nd->nl_flags |= NLC_CREATE; |
| 1742 | if ((error = nlookup(nd)) != 0) |
| 1743 | return (error); |
| 1744 | ncp = nd->nl_ncp; |
| 1745 | if (ncp->nc_vp) |
| 1746 | return (EEXIST); |
| 1747 | |
| 1748 | VATTR_NULL(&vattr); |
| 1749 | vattr.va_mode = mode; |
| 1750 | error = VOP_NSYMLINK(ncp, &vp, nd->nl_cred, &vattr, path); |
| 1751 | if (error == 0) |
| 1752 | vput(vp); |
| 1753 | return (error); |
| 1754 | } |
| 1755 | |
| 1756 | /* |
| 1757 | * symlink(char *path, char *link) |
| 1758 | * |
| 1759 | * Make a symbolic link. |
| 1760 | */ |
| 1761 | int |
| 1762 | sys_symlink(struct symlink_args *uap) |
| 1763 | { |
| 1764 | struct thread *td = curthread; |
| 1765 | struct nlookupdata nd; |
| 1766 | char *path; |
| 1767 | int error; |
| 1768 | int mode; |
| 1769 | |
| 1770 | path = objcache_get(namei_oc, M_WAITOK); |
| 1771 | error = copyinstr(uap->path, path, MAXPATHLEN, NULL); |
| 1772 | if (error == 0) { |
| 1773 | error = nlookup_init(&nd, uap->link, UIO_USERSPACE, 0); |
| 1774 | if (error == 0) { |
| 1775 | mode = ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask; |
| 1776 | error = kern_symlink(&nd, path, mode); |
| 1777 | } |
| 1778 | nlookup_done(&nd); |
| 1779 | } |
| 1780 | objcache_put(namei_oc, path); |
| 1781 | return (error); |
| 1782 | } |
| 1783 | |
| 1784 | /* |
| 1785 | * undelete_args(char *path) |
| 1786 | * |
| 1787 | * Delete a whiteout from the filesystem. |
| 1788 | */ |
| 1789 | /* ARGSUSED */ |
| 1790 | int |
| 1791 | sys_undelete(struct undelete_args *uap) |
| 1792 | { |
| 1793 | struct nlookupdata nd; |
| 1794 | int error; |
| 1795 | |
| 1796 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 1797 | bwillwrite(); |
| 1798 | nd.nl_flags |= NLC_DELETE; |
| 1799 | if (error == 0) |
| 1800 | error = nlookup(&nd); |
| 1801 | if (error == 0) |
| 1802 | error = VOP_NWHITEOUT(nd.nl_ncp, nd.nl_cred, NAMEI_DELETE); |
| 1803 | nlookup_done(&nd); |
| 1804 | return (error); |
| 1805 | } |
| 1806 | |
| 1807 | int |
| 1808 | kern_unlink(struct nlookupdata *nd) |
| 1809 | { |
| 1810 | struct namecache *ncp; |
| 1811 | int error; |
| 1812 | |
| 1813 | bwillwrite(); |
| 1814 | nd->nl_flags |= NLC_DELETE; |
| 1815 | if ((error = nlookup(nd)) != 0) |
| 1816 | return (error); |
| 1817 | ncp = nd->nl_ncp; |
| 1818 | error = VOP_NREMOVE(ncp, nd->nl_cred); |
| 1819 | return (error); |
| 1820 | } |
| 1821 | |
| 1822 | /* |
| 1823 | * unlink_args(char *path) |
| 1824 | * |
| 1825 | * Delete a name from the filesystem. |
| 1826 | */ |
| 1827 | int |
| 1828 | sys_unlink(struct unlink_args *uap) |
| 1829 | { |
| 1830 | struct nlookupdata nd; |
| 1831 | int error; |
| 1832 | |
| 1833 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 1834 | if (error == 0) |
| 1835 | error = kern_unlink(&nd); |
| 1836 | nlookup_done(&nd); |
| 1837 | return (error); |
| 1838 | } |
| 1839 | |
| 1840 | int |
| 1841 | kern_lseek(int fd, off_t offset, int whence, off_t *res) |
| 1842 | { |
| 1843 | struct thread *td = curthread; |
| 1844 | struct proc *p = td->td_proc; |
| 1845 | struct file *fp; |
| 1846 | struct vattr vattr; |
| 1847 | int error; |
| 1848 | |
| 1849 | fp = holdfp(p->p_fd, fd, -1); |
| 1850 | if (fp == NULL) |
| 1851 | return (EBADF); |
| 1852 | if (fp->f_type != DTYPE_VNODE) { |
| 1853 | error = ESPIPE; |
| 1854 | goto done; |
| 1855 | } |
| 1856 | |
| 1857 | switch (whence) { |
| 1858 | case L_INCR: |
| 1859 | fp->f_offset += offset; |
| 1860 | error = 0; |
| 1861 | break; |
| 1862 | case L_XTND: |
| 1863 | error = VOP_GETATTR((struct vnode *)fp->f_data, &vattr); |
| 1864 | if (error == 0) |
| 1865 | fp->f_offset = offset + vattr.va_size; |
| 1866 | break; |
| 1867 | case L_SET: |
| 1868 | fp->f_offset = offset; |
| 1869 | error = 0; |
| 1870 | break; |
| 1871 | default: |
| 1872 | error = EINVAL; |
| 1873 | break; |
| 1874 | } |
| 1875 | *res = fp->f_offset; |
| 1876 | done: |
| 1877 | fdrop(fp); |
| 1878 | return (error); |
| 1879 | } |
| 1880 | |
| 1881 | /* |
| 1882 | * lseek_args(int fd, int pad, off_t offset, int whence) |
| 1883 | * |
| 1884 | * Reposition read/write file offset. |
| 1885 | */ |
| 1886 | int |
| 1887 | sys_lseek(struct lseek_args *uap) |
| 1888 | { |
| 1889 | int error; |
| 1890 | |
| 1891 | error = kern_lseek(uap->fd, uap->offset, uap->whence, |
| 1892 | &uap->sysmsg_offset); |
| 1893 | |
| 1894 | return (error); |
| 1895 | } |
| 1896 | |
| 1897 | int |
| 1898 | kern_access(struct nlookupdata *nd, int aflags) |
| 1899 | { |
| 1900 | struct vnode *vp; |
| 1901 | int error, flags; |
| 1902 | |
| 1903 | if ((error = nlookup(nd)) != 0) |
| 1904 | return (error); |
| 1905 | retry: |
| 1906 | error = cache_vget(nd->nl_ncp, nd->nl_cred, LK_EXCLUSIVE, &vp); |
| 1907 | if (error) |
| 1908 | return (error); |
| 1909 | |
| 1910 | /* Flags == 0 means only check for existence. */ |
| 1911 | if (aflags) { |
| 1912 | flags = 0; |
| 1913 | if (aflags & R_OK) |
| 1914 | flags |= VREAD; |
| 1915 | if (aflags & W_OK) |
| 1916 | flags |= VWRITE; |
| 1917 | if (aflags & X_OK) |
| 1918 | flags |= VEXEC; |
| 1919 | if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) |
| 1920 | error = VOP_ACCESS(vp, flags, nd->nl_cred); |
| 1921 | |
| 1922 | /* |
| 1923 | * If the file handle is stale we have to re-resolve the |
| 1924 | * entry. This is a hack at the moment. |
| 1925 | */ |
| 1926 | if (error == ESTALE) { |
| 1927 | cache_setunresolved(nd->nl_ncp); |
| 1928 | error = cache_resolve(nd->nl_ncp, nd->nl_cred); |
| 1929 | if (error == 0) { |
| 1930 | vput(vp); |
| 1931 | vp = NULL; |
| 1932 | goto retry; |
| 1933 | } |
| 1934 | } |
| 1935 | } |
| 1936 | vput(vp); |
| 1937 | return (error); |
| 1938 | } |
| 1939 | |
| 1940 | /* |
| 1941 | * access_args(char *path, int flags) |
| 1942 | * |
| 1943 | * Check access permissions. |
| 1944 | */ |
| 1945 | int |
| 1946 | sys_access(struct access_args *uap) |
| 1947 | { |
| 1948 | struct nlookupdata nd; |
| 1949 | int error; |
| 1950 | |
| 1951 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 1952 | if (error == 0) |
| 1953 | error = kern_access(&nd, uap->flags); |
| 1954 | nlookup_done(&nd); |
| 1955 | return (error); |
| 1956 | } |
| 1957 | |
| 1958 | int |
| 1959 | kern_stat(struct nlookupdata *nd, struct stat *st) |
| 1960 | { |
| 1961 | int error; |
| 1962 | struct vnode *vp; |
| 1963 | thread_t td; |
| 1964 | |
| 1965 | if ((error = nlookup(nd)) != 0) |
| 1966 | return (error); |
| 1967 | again: |
| 1968 | if ((vp = nd->nl_ncp->nc_vp) == NULL) |
| 1969 | return (ENOENT); |
| 1970 | |
| 1971 | td = curthread; |
| 1972 | if ((error = vget(vp, LK_SHARED)) != 0) |
| 1973 | return (error); |
| 1974 | error = vn_stat(vp, st, nd->nl_cred); |
| 1975 | |
| 1976 | /* |
| 1977 | * If the file handle is stale we have to re-resolve the entry. This |
| 1978 | * is a hack at the moment. |
| 1979 | */ |
| 1980 | if (error == ESTALE) { |
| 1981 | cache_setunresolved(nd->nl_ncp); |
| 1982 | error = cache_resolve(nd->nl_ncp, nd->nl_cred); |
| 1983 | if (error == 0) { |
| 1984 | vput(vp); |
| 1985 | goto again; |
| 1986 | } |
| 1987 | } |
| 1988 | vput(vp); |
| 1989 | return (error); |
| 1990 | } |
| 1991 | |
| 1992 | /* |
| 1993 | * stat_args(char *path, struct stat *ub) |
| 1994 | * |
| 1995 | * Get file status; this version follows links. |
| 1996 | */ |
| 1997 | int |
| 1998 | sys_stat(struct stat_args *uap) |
| 1999 | { |
| 2000 | struct nlookupdata nd; |
| 2001 | struct stat st; |
| 2002 | int error; |
| 2003 | |
| 2004 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 2005 | if (error == 0) { |
| 2006 | error = kern_stat(&nd, &st); |
| 2007 | if (error == 0) |
| 2008 | error = copyout(&st, uap->ub, sizeof(*uap->ub)); |
| 2009 | } |
| 2010 | nlookup_done(&nd); |
| 2011 | return (error); |
| 2012 | } |
| 2013 | |
| 2014 | /* |
| 2015 | * lstat_args(char *path, struct stat *ub) |
| 2016 | * |
| 2017 | * Get file status; this version does not follow links. |
| 2018 | */ |
| 2019 | int |
| 2020 | sys_lstat(struct lstat_args *uap) |
| 2021 | { |
| 2022 | struct nlookupdata nd; |
| 2023 | struct stat st; |
| 2024 | int error; |
| 2025 | |
| 2026 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 2027 | if (error == 0) { |
| 2028 | error = kern_stat(&nd, &st); |
| 2029 | if (error == 0) |
| 2030 | error = copyout(&st, uap->ub, sizeof(*uap->ub)); |
| 2031 | } |
| 2032 | nlookup_done(&nd); |
| 2033 | return (error); |
| 2034 | } |
| 2035 | |
| 2036 | /* |
| 2037 | * pathconf_Args(char *path, int name) |
| 2038 | * |
| 2039 | * Get configurable pathname variables. |
| 2040 | */ |
| 2041 | /* ARGSUSED */ |
| 2042 | int |
| 2043 | sys_pathconf(struct pathconf_args *uap) |
| 2044 | { |
| 2045 | struct nlookupdata nd; |
| 2046 | struct vnode *vp; |
| 2047 | int error; |
| 2048 | |
| 2049 | vp = NULL; |
| 2050 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 2051 | if (error == 0) |
| 2052 | error = nlookup(&nd); |
| 2053 | if (error == 0) |
| 2054 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 2055 | nlookup_done(&nd); |
| 2056 | if (error == 0) { |
| 2057 | error = VOP_PATHCONF(vp, uap->name, uap->sysmsg_fds); |
| 2058 | vput(vp); |
| 2059 | } |
| 2060 | return (error); |
| 2061 | } |
| 2062 | |
| 2063 | /* |
| 2064 | * XXX: daver |
| 2065 | * kern_readlink isn't properly split yet. There is a copyin burried |
| 2066 | * in VOP_READLINK(). |
| 2067 | */ |
| 2068 | int |
| 2069 | kern_readlink(struct nlookupdata *nd, char *buf, int count, int *res) |
| 2070 | { |
| 2071 | struct thread *td = curthread; |
| 2072 | struct proc *p = td->td_proc; |
| 2073 | struct vnode *vp; |
| 2074 | struct iovec aiov; |
| 2075 | struct uio auio; |
| 2076 | int error; |
| 2077 | |
| 2078 | if ((error = nlookup(nd)) != 0) |
| 2079 | return (error); |
| 2080 | error = cache_vget(nd->nl_ncp, nd->nl_cred, LK_EXCLUSIVE, &vp); |
| 2081 | if (error) |
| 2082 | return (error); |
| 2083 | if (vp->v_type != VLNK) { |
| 2084 | error = EINVAL; |
| 2085 | } else { |
| 2086 | aiov.iov_base = buf; |
| 2087 | aiov.iov_len = count; |
| 2088 | auio.uio_iov = &aiov; |
| 2089 | auio.uio_iovcnt = 1; |
| 2090 | auio.uio_offset = 0; |
| 2091 | auio.uio_rw = UIO_READ; |
| 2092 | auio.uio_segflg = UIO_USERSPACE; |
| 2093 | auio.uio_td = td; |
| 2094 | auio.uio_resid = count; |
| 2095 | error = VOP_READLINK(vp, &auio, p->p_ucred); |
| 2096 | } |
| 2097 | vput(vp); |
| 2098 | *res = count - auio.uio_resid; |
| 2099 | return (error); |
| 2100 | } |
| 2101 | |
| 2102 | /* |
| 2103 | * readlink_args(char *path, char *buf, int count) |
| 2104 | * |
| 2105 | * Return target name of a symbolic link. |
| 2106 | */ |
| 2107 | int |
| 2108 | sys_readlink(struct readlink_args *uap) |
| 2109 | { |
| 2110 | struct nlookupdata nd; |
| 2111 | int error; |
| 2112 | |
| 2113 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 2114 | if (error == 0) { |
| 2115 | error = kern_readlink(&nd, uap->buf, uap->count, |
| 2116 | &uap->sysmsg_result); |
| 2117 | } |
| 2118 | nlookup_done(&nd); |
| 2119 | return (error); |
| 2120 | } |
| 2121 | |
| 2122 | static int |
| 2123 | setfflags(struct vnode *vp, int flags) |
| 2124 | { |
| 2125 | struct thread *td = curthread; |
| 2126 | struct proc *p = td->td_proc; |
| 2127 | int error; |
| 2128 | struct vattr vattr; |
| 2129 | |
| 2130 | /* |
| 2131 | * Prevent non-root users from setting flags on devices. When |
| 2132 | * a device is reused, users can retain ownership of the device |
| 2133 | * if they are allowed to set flags and programs assume that |
| 2134 | * chown can't fail when done as root. |
| 2135 | */ |
| 2136 | if ((vp->v_type == VCHR || vp->v_type == VBLK) && |
| 2137 | ((error = suser_cred(p->p_ucred, PRISON_ROOT)) != 0)) |
| 2138 | return (error); |
| 2139 | |
| 2140 | /* |
| 2141 | * note: vget is required for any operation that might mod the vnode |
| 2142 | * so VINACTIVE is properly cleared. |
| 2143 | */ |
| 2144 | if ((error = vget(vp, LK_EXCLUSIVE)) == 0) { |
| 2145 | VATTR_NULL(&vattr); |
| 2146 | vattr.va_flags = flags; |
| 2147 | error = VOP_SETATTR(vp, &vattr, p->p_ucred); |
| 2148 | vput(vp); |
| 2149 | } |
| 2150 | return (error); |
| 2151 | } |
| 2152 | |
| 2153 | /* |
| 2154 | * chflags(char *path, int flags) |
| 2155 | * |
| 2156 | * Change flags of a file given a path name. |
| 2157 | */ |
| 2158 | /* ARGSUSED */ |
| 2159 | int |
| 2160 | sys_chflags(struct chflags_args *uap) |
| 2161 | { |
| 2162 | struct nlookupdata nd; |
| 2163 | struct vnode *vp; |
| 2164 | int error; |
| 2165 | |
| 2166 | vp = NULL; |
| 2167 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 2168 | /* XXX Add NLC flag indicating modifying operation? */ |
| 2169 | if (error == 0) |
| 2170 | error = nlookup(&nd); |
| 2171 | if (error == 0) |
| 2172 | error = cache_vref(nd.nl_ncp, nd.nl_cred, &vp); |
| 2173 | nlookup_done(&nd); |
| 2174 | if (error == 0) { |
| 2175 | error = setfflags(vp, uap->flags); |
| 2176 | vrele(vp); |
| 2177 | } |
| 2178 | return (error); |
| 2179 | } |
| 2180 | |
| 2181 | /* |
| 2182 | * fchflags_args(int fd, int flags) |
| 2183 | * |
| 2184 | * Change flags of a file given a file descriptor. |
| 2185 | */ |
| 2186 | /* ARGSUSED */ |
| 2187 | int |
| 2188 | sys_fchflags(struct fchflags_args *uap) |
| 2189 | { |
| 2190 | struct thread *td = curthread; |
| 2191 | struct proc *p = td->td_proc; |
| 2192 | struct file *fp; |
| 2193 | int error; |
| 2194 | |
| 2195 | if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0) |
| 2196 | return (error); |
| 2197 | error = setfflags((struct vnode *) fp->f_data, uap->flags); |
| 2198 | fdrop(fp); |
| 2199 | return (error); |
| 2200 | } |
| 2201 | |
| 2202 | static int |
| 2203 | setfmode(struct vnode *vp, int mode) |
| 2204 | { |
| 2205 | struct thread *td = curthread; |
| 2206 | struct proc *p = td->td_proc; |
| 2207 | int error; |
| 2208 | struct vattr vattr; |
| 2209 | |
| 2210 | /* |
| 2211 | * note: vget is required for any operation that might mod the vnode |
| 2212 | * so VINACTIVE is properly cleared. |
| 2213 | */ |
| 2214 | if ((error = vget(vp, LK_EXCLUSIVE)) == 0) { |
| 2215 | VATTR_NULL(&vattr); |
| 2216 | vattr.va_mode = mode & ALLPERMS; |
| 2217 | error = VOP_SETATTR(vp, &vattr, p->p_ucred); |
| 2218 | vput(vp); |
| 2219 | } |
| 2220 | return error; |
| 2221 | } |
| 2222 | |
| 2223 | int |
| 2224 | kern_chmod(struct nlookupdata *nd, int mode) |
| 2225 | { |
| 2226 | struct vnode *vp; |
| 2227 | int error; |
| 2228 | |
| 2229 | /* XXX Add NLC flag indicating modifying operation? */ |
| 2230 | if ((error = nlookup(nd)) != 0) |
| 2231 | return (error); |
| 2232 | if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0) |
| 2233 | return (error); |
| 2234 | error = setfmode(vp, mode); |
| 2235 | vrele(vp); |
| 2236 | return (error); |
| 2237 | } |
| 2238 | |
| 2239 | /* |
| 2240 | * chmod_args(char *path, int mode) |
| 2241 | * |
| 2242 | * Change mode of a file given path name. |
| 2243 | */ |
| 2244 | /* ARGSUSED */ |
| 2245 | int |
| 2246 | sys_chmod(struct chmod_args *uap) |
| 2247 | { |
| 2248 | struct nlookupdata nd; |
| 2249 | int error; |
| 2250 | |
| 2251 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 2252 | if (error == 0) |
| 2253 | error = kern_chmod(&nd, uap->mode); |
| 2254 | nlookup_done(&nd); |
| 2255 | return (error); |
| 2256 | } |
| 2257 | |
| 2258 | /* |
| 2259 | * lchmod_args(char *path, int mode) |
| 2260 | * |
| 2261 | * Change mode of a file given path name (don't follow links.) |
| 2262 | */ |
| 2263 | /* ARGSUSED */ |
| 2264 | int |
| 2265 | sys_lchmod(struct lchmod_args *uap) |
| 2266 | { |
| 2267 | struct nlookupdata nd; |
| 2268 | int error; |
| 2269 | |
| 2270 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 2271 | if (error == 0) |
| 2272 | error = kern_chmod(&nd, uap->mode); |
| 2273 | nlookup_done(&nd); |
| 2274 | return (error); |
| 2275 | } |
| 2276 | |
| 2277 | /* |
| 2278 | * fchmod_args(int fd, int mode) |
| 2279 | * |
| 2280 | * Change mode of a file given a file descriptor. |
| 2281 | */ |
| 2282 | /* ARGSUSED */ |
| 2283 | int |
| 2284 | sys_fchmod(struct fchmod_args *uap) |
| 2285 | { |
| 2286 | struct thread *td = curthread; |
| 2287 | struct proc *p = td->td_proc; |
| 2288 | struct file *fp; |
| 2289 | int error; |
| 2290 | |
| 2291 | if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0) |
| 2292 | return (error); |
| 2293 | error = setfmode((struct vnode *)fp->f_data, uap->mode); |
| 2294 | fdrop(fp); |
| 2295 | return (error); |
| 2296 | } |
| 2297 | |
| 2298 | static int |
| 2299 | setfown(struct vnode *vp, uid_t uid, gid_t gid) |
| 2300 | { |
| 2301 | struct thread *td = curthread; |
| 2302 | struct proc *p = td->td_proc; |
| 2303 | int error; |
| 2304 | struct vattr vattr; |
| 2305 | |
| 2306 | /* |
| 2307 | * note: vget is required for any operation that might mod the vnode |
| 2308 | * so VINACTIVE is properly cleared. |
| 2309 | */ |
| 2310 | if ((error = vget(vp, LK_EXCLUSIVE)) == 0) { |
| 2311 | VATTR_NULL(&vattr); |
| 2312 | vattr.va_uid = uid; |
| 2313 | vattr.va_gid = gid; |
| 2314 | error = VOP_SETATTR(vp, &vattr, p->p_ucred); |
| 2315 | vput(vp); |
| 2316 | } |
| 2317 | return error; |
| 2318 | } |
| 2319 | |
| 2320 | int |
| 2321 | kern_chown(struct nlookupdata *nd, int uid, int gid) |
| 2322 | { |
| 2323 | struct vnode *vp; |
| 2324 | int error; |
| 2325 | |
| 2326 | /* XXX Add NLC flag indicating modifying operation? */ |
| 2327 | if ((error = nlookup(nd)) != 0) |
| 2328 | return (error); |
| 2329 | if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0) |
| 2330 | return (error); |
| 2331 | error = setfown(vp, uid, gid); |
| 2332 | vrele(vp); |
| 2333 | return (error); |
| 2334 | } |
| 2335 | |
| 2336 | /* |
| 2337 | * chown(char *path, int uid, int gid) |
| 2338 | * |
| 2339 | * Set ownership given a path name. |
| 2340 | */ |
| 2341 | int |
| 2342 | sys_chown(struct chown_args *uap) |
| 2343 | { |
| 2344 | struct nlookupdata nd; |
| 2345 | int error; |
| 2346 | |
| 2347 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 2348 | if (error == 0) |
| 2349 | error = kern_chown(&nd, uap->uid, uap->gid); |
| 2350 | nlookup_done(&nd); |
| 2351 | return (error); |
| 2352 | } |
| 2353 | |
| 2354 | /* |
| 2355 | * lchown_args(char *path, int uid, int gid) |
| 2356 | * |
| 2357 | * Set ownership given a path name, do not cross symlinks. |
| 2358 | */ |
| 2359 | int |
| 2360 | sys_lchown(struct lchown_args *uap) |
| 2361 | { |
| 2362 | struct nlookupdata nd; |
| 2363 | int error; |
| 2364 | |
| 2365 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 2366 | if (error == 0) |
| 2367 | error = kern_chown(&nd, uap->uid, uap->gid); |
| 2368 | nlookup_done(&nd); |
| 2369 | return (error); |
| 2370 | } |
| 2371 | |
| 2372 | /* |
| 2373 | * fchown_args(int fd, int uid, int gid) |
| 2374 | * |
| 2375 | * Set ownership given a file descriptor. |
| 2376 | */ |
| 2377 | /* ARGSUSED */ |
| 2378 | int |
| 2379 | sys_fchown(struct fchown_args *uap) |
| 2380 | { |
| 2381 | struct thread *td = curthread; |
| 2382 | struct proc *p = td->td_proc; |
| 2383 | struct file *fp; |
| 2384 | int error; |
| 2385 | |
| 2386 | if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0) |
| 2387 | return (error); |
| 2388 | error = setfown((struct vnode *)fp->f_data, uap->uid, uap->gid); |
| 2389 | fdrop(fp); |
| 2390 | return (error); |
| 2391 | } |
| 2392 | |
| 2393 | static int |
| 2394 | getutimes(const struct timeval *tvp, struct timespec *tsp) |
| 2395 | { |
| 2396 | struct timeval tv[2]; |
| 2397 | |
| 2398 | if (tvp == NULL) { |
| 2399 | microtime(&tv[0]); |
| 2400 | TIMEVAL_TO_TIMESPEC(&tv[0], &tsp[0]); |
| 2401 | tsp[1] = tsp[0]; |
| 2402 | } else { |
| 2403 | TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); |
| 2404 | TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); |
| 2405 | } |
| 2406 | return 0; |
| 2407 | } |
| 2408 | |
| 2409 | static int |
| 2410 | setutimes(struct vnode *vp, const struct timespec *ts, int nullflag) |
| 2411 | { |
| 2412 | struct thread *td = curthread; |
| 2413 | struct proc *p = td->td_proc; |
| 2414 | int error; |
| 2415 | struct vattr vattr; |
| 2416 | |
| 2417 | /* |
| 2418 | * note: vget is required for any operation that might mod the vnode |
| 2419 | * so VINACTIVE is properly cleared. |
| 2420 | */ |
| 2421 | if ((error = vget(vp, LK_EXCLUSIVE)) == 0) { |
| 2422 | VATTR_NULL(&vattr); |
| 2423 | vattr.va_atime = ts[0]; |
| 2424 | vattr.va_mtime = ts[1]; |
| 2425 | if (nullflag) |
| 2426 | vattr.va_vaflags |= VA_UTIMES_NULL; |
| 2427 | error = VOP_SETATTR(vp, &vattr, p->p_ucred); |
| 2428 | vput(vp); |
| 2429 | } |
| 2430 | return error; |
| 2431 | } |
| 2432 | |
| 2433 | int |
| 2434 | kern_utimes(struct nlookupdata *nd, struct timeval *tptr) |
| 2435 | { |
| 2436 | struct timespec ts[2]; |
| 2437 | struct vnode *vp; |
| 2438 | int error; |
| 2439 | |
| 2440 | if ((error = getutimes(tptr, ts)) != 0) |
| 2441 | return (error); |
| 2442 | /* XXX Add NLC flag indicating modifying operation? */ |
| 2443 | if ((error = nlookup(nd)) != 0) |
| 2444 | return (error); |
| 2445 | if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0) |
| 2446 | return (error); |
| 2447 | error = setutimes(vp, ts, tptr == NULL); |
| 2448 | vrele(vp); |
| 2449 | return (error); |
| 2450 | } |
| 2451 | |
| 2452 | /* |
| 2453 | * utimes_args(char *path, struct timeval *tptr) |
| 2454 | * |
| 2455 | * Set the access and modification times of a file. |
| 2456 | */ |
| 2457 | int |
| 2458 | sys_utimes(struct utimes_args *uap) |
| 2459 | { |
| 2460 | struct timeval tv[2]; |
| 2461 | struct nlookupdata nd; |
| 2462 | int error; |
| 2463 | |
| 2464 | if (uap->tptr) { |
| 2465 | error = copyin(uap->tptr, tv, sizeof(tv)); |
| 2466 | if (error) |
| 2467 | return (error); |
| 2468 | } |
| 2469 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 2470 | if (error == 0) |
| 2471 | error = kern_utimes(&nd, uap->tptr ? tv : NULL); |
| 2472 | nlookup_done(&nd); |
| 2473 | return (error); |
| 2474 | } |
| 2475 | |
| 2476 | /* |
| 2477 | * lutimes_args(char *path, struct timeval *tptr) |
| 2478 | * |
| 2479 | * Set the access and modification times of a file. |
| 2480 | */ |
| 2481 | int |
| 2482 | sys_lutimes(struct lutimes_args *uap) |
| 2483 | { |
| 2484 | struct timeval tv[2]; |
| 2485 | struct nlookupdata nd; |
| 2486 | int error; |
| 2487 | |
| 2488 | if (uap->tptr) { |
| 2489 | error = copyin(uap->tptr, tv, sizeof(tv)); |
| 2490 | if (error) |
| 2491 | return (error); |
| 2492 | } |
| 2493 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 2494 | if (error == 0) |
| 2495 | error = kern_utimes(&nd, uap->tptr ? tv : NULL); |
| 2496 | nlookup_done(&nd); |
| 2497 | return (error); |
| 2498 | } |
| 2499 | |
| 2500 | int |
| 2501 | kern_futimes(int fd, struct timeval *tptr) |
| 2502 | { |
| 2503 | struct thread *td = curthread; |
| 2504 | struct proc *p = td->td_proc; |
| 2505 | struct timespec ts[2]; |
| 2506 | struct file *fp; |
| 2507 | int error; |
| 2508 | |
| 2509 | error = getutimes(tptr, ts); |
| 2510 | if (error) |
| 2511 | return (error); |
| 2512 | if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) |
| 2513 | return (error); |
| 2514 | error = setutimes((struct vnode *)fp->f_data, ts, tptr == NULL); |
| 2515 | fdrop(fp); |
| 2516 | return (error); |
| 2517 | } |
| 2518 | |
| 2519 | /* |
| 2520 | * futimes_args(int fd, struct timeval *tptr) |
| 2521 | * |
| 2522 | * Set the access and modification times of a file. |
| 2523 | */ |
| 2524 | int |
| 2525 | sys_futimes(struct futimes_args *uap) |
| 2526 | { |
| 2527 | struct timeval tv[2]; |
| 2528 | int error; |
| 2529 | |
| 2530 | if (uap->tptr) { |
| 2531 | error = copyin(uap->tptr, tv, sizeof(tv)); |
| 2532 | if (error) |
| 2533 | return (error); |
| 2534 | } |
| 2535 | |
| 2536 | error = kern_futimes(uap->fd, uap->tptr ? tv : NULL); |
| 2537 | |
| 2538 | return (error); |
| 2539 | } |
| 2540 | |
| 2541 | int |
| 2542 | kern_truncate(struct nlookupdata *nd, off_t length) |
| 2543 | { |
| 2544 | struct vnode *vp; |
| 2545 | struct vattr vattr; |
| 2546 | int error; |
| 2547 | |
| 2548 | if (length < 0) |
| 2549 | return(EINVAL); |
| 2550 | /* XXX Add NLC flag indicating modifying operation? */ |
| 2551 | if ((error = nlookup(nd)) != 0) |
| 2552 | return (error); |
| 2553 | if ((error = cache_vref(nd->nl_ncp, nd->nl_cred, &vp)) != 0) |
| 2554 | return (error); |
| 2555 | if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) != 0) { |
| 2556 | vrele(vp); |
| 2557 | return (error); |
| 2558 | } |
| 2559 | if (vp->v_type == VDIR) { |
| 2560 | error = EISDIR; |
| 2561 | } else if ((error = vn_writechk(vp)) == 0 && |
| 2562 | (error = VOP_ACCESS(vp, VWRITE, nd->nl_cred)) == 0) { |
| 2563 | VATTR_NULL(&vattr); |
| 2564 | vattr.va_size = length; |
| 2565 | error = VOP_SETATTR(vp, &vattr, nd->nl_cred); |
| 2566 | } |
| 2567 | vput(vp); |
| 2568 | return (error); |
| 2569 | } |
| 2570 | |
| 2571 | /* |
| 2572 | * truncate(char *path, int pad, off_t length) |
| 2573 | * |
| 2574 | * Truncate a file given its path name. |
| 2575 | */ |
| 2576 | int |
| 2577 | sys_truncate(struct truncate_args *uap) |
| 2578 | { |
| 2579 | struct nlookupdata nd; |
| 2580 | int error; |
| 2581 | |
| 2582 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 2583 | if (error == 0) |
| 2584 | error = kern_truncate(&nd, uap->length); |
| 2585 | nlookup_done(&nd); |
| 2586 | return error; |
| 2587 | } |
| 2588 | |
| 2589 | int |
| 2590 | kern_ftruncate(int fd, off_t length) |
| 2591 | { |
| 2592 | struct thread *td = curthread; |
| 2593 | struct proc *p = td->td_proc; |
| 2594 | struct vattr vattr; |
| 2595 | struct vnode *vp; |
| 2596 | struct file *fp; |
| 2597 | int error; |
| 2598 | |
| 2599 | if (length < 0) |
| 2600 | return(EINVAL); |
| 2601 | if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) |
| 2602 | return (error); |
| 2603 | if ((fp->f_flag & FWRITE) == 0) { |
| 2604 | error = EINVAL; |
| 2605 | goto done; |
| 2606 | } |
| 2607 | vp = (struct vnode *)fp->f_data; |
| 2608 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 2609 | if (vp->v_type == VDIR) { |
| 2610 | error = EISDIR; |
| 2611 | } else if ((error = vn_writechk(vp)) == 0) { |
| 2612 | VATTR_NULL(&vattr); |
| 2613 | vattr.va_size = length; |
| 2614 | error = VOP_SETATTR(vp, &vattr, fp->f_cred); |
| 2615 | } |
| 2616 | VOP_UNLOCK(vp, 0); |
| 2617 | done: |
| 2618 | fdrop(fp); |
| 2619 | return (error); |
| 2620 | } |
| 2621 | |
| 2622 | /* |
| 2623 | * ftruncate_args(int fd, int pad, off_t length) |
| 2624 | * |
| 2625 | * Truncate a file given a file descriptor. |
| 2626 | */ |
| 2627 | int |
| 2628 | sys_ftruncate(struct ftruncate_args *uap) |
| 2629 | { |
| 2630 | int error; |
| 2631 | |
| 2632 | error = kern_ftruncate(uap->fd, uap->length); |
| 2633 | |
| 2634 | return (error); |
| 2635 | } |
| 2636 | |
| 2637 | /* |
| 2638 | * fsync(int fd) |
| 2639 | * |
| 2640 | * Sync an open file. |
| 2641 | */ |
| 2642 | /* ARGSUSED */ |
| 2643 | int |
| 2644 | sys_fsync(struct fsync_args *uap) |
| 2645 | { |
| 2646 | struct thread *td = curthread; |
| 2647 | struct proc *p = td->td_proc; |
| 2648 | struct vnode *vp; |
| 2649 | struct file *fp; |
| 2650 | vm_object_t obj; |
| 2651 | int error; |
| 2652 | |
| 2653 | if ((error = holdvnode(p->p_fd, uap->fd, &fp)) != 0) |
| 2654 | return (error); |
| 2655 | vp = (struct vnode *)fp->f_data; |
| 2656 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 2657 | if ((obj = vp->v_object) != NULL) |
| 2658 | vm_object_page_clean(obj, 0, 0, 0); |
| 2659 | if ((error = VOP_FSYNC(vp, MNT_WAIT)) == 0 && |
| 2660 | vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP) && |
| 2661 | bioops.io_fsync) { |
| 2662 | error = (*bioops.io_fsync)(vp); |
| 2663 | } |
| 2664 | VOP_UNLOCK(vp, 0); |
| 2665 | fdrop(fp); |
| 2666 | return (error); |
| 2667 | } |
| 2668 | |
| 2669 | int |
| 2670 | kern_rename(struct nlookupdata *fromnd, struct nlookupdata *tond) |
| 2671 | { |
| 2672 | struct namecache *fncpd; |
| 2673 | struct namecache *tncpd; |
| 2674 | struct namecache *ncp; |
| 2675 | struct mount *mp; |
| 2676 | int error; |
| 2677 | |
| 2678 | bwillwrite(); |
| 2679 | if ((error = nlookup(fromnd)) != 0) |
| 2680 | return (error); |
| 2681 | if ((fncpd = fromnd->nl_ncp->nc_parent) == NULL) |
| 2682 | return (ENOENT); |
| 2683 | cache_hold(fncpd); |
| 2684 | |
| 2685 | /* |
| 2686 | * unlock the source ncp so we can lookup the target ncp without |
| 2687 | * deadlocking. The target may or may not exist so we do not check |
| 2688 | * for a target vp like kern_mkdir() and other creation functions do. |
| 2689 | * |
| 2690 | * The source and target directories are ref'd and rechecked after |
| 2691 | * everything is relocked to determine if the source or target file |
| 2692 | * has been renamed. |
| 2693 | */ |
| 2694 | KKASSERT(fromnd->nl_flags & NLC_NCPISLOCKED); |
| 2695 | fromnd->nl_flags &= ~NLC_NCPISLOCKED; |
| 2696 | cache_unlock(fromnd->nl_ncp); |
| 2697 | |
| 2698 | tond->nl_flags |= NLC_CREATE; |
| 2699 | if ((error = nlookup(tond)) != 0) { |
| 2700 | cache_drop(fncpd); |
| 2701 | return (error); |
| 2702 | } |
| 2703 | if ((tncpd = tond->nl_ncp->nc_parent) == NULL) { |
| 2704 | cache_drop(fncpd); |
| 2705 | return (ENOENT); |
| 2706 | } |
| 2707 | cache_hold(tncpd); |
| 2708 | |
| 2709 | /* |
| 2710 | * If the source and target are the same there is nothing to do |
| 2711 | */ |
| 2712 | if (fromnd->nl_ncp == tond->nl_ncp) { |
| 2713 | cache_drop(fncpd); |
| 2714 | cache_drop(tncpd); |
| 2715 | return (0); |
| 2716 | } |
| 2717 | |
| 2718 | /* |
| 2719 | * relock the source ncp. NOTE AFTER RELOCKING: the source ncp |
| 2720 | * may have become invalid while it was unlocked, nc_vp and nc_mount |
| 2721 | * could be NULL. |
| 2722 | */ |
| 2723 | if (cache_lock_nonblock(fromnd->nl_ncp) == 0) { |
| 2724 | cache_resolve(fromnd->nl_ncp, fromnd->nl_cred); |
| 2725 | } else if (fromnd->nl_ncp > tond->nl_ncp) { |
| 2726 | cache_lock(fromnd->nl_ncp); |
| 2727 | cache_resolve(fromnd->nl_ncp, fromnd->nl_cred); |
| 2728 | } else { |
| 2729 | cache_unlock(tond->nl_ncp); |
| 2730 | cache_lock(fromnd->nl_ncp); |
| 2731 | cache_resolve(fromnd->nl_ncp, fromnd->nl_cred); |
| 2732 | cache_lock(tond->nl_ncp); |
| 2733 | cache_resolve(tond->nl_ncp, tond->nl_cred); |
| 2734 | } |
| 2735 | fromnd->nl_flags |= NLC_NCPISLOCKED; |
| 2736 | |
| 2737 | /* |
| 2738 | * make sure the parent directories linkages are the same |
| 2739 | */ |
| 2740 | if (fncpd != fromnd->nl_ncp->nc_parent || |
| 2741 | tncpd != tond->nl_ncp->nc_parent) { |
| 2742 | cache_drop(fncpd); |
| 2743 | cache_drop(tncpd); |
| 2744 | return (ENOENT); |
| 2745 | } |
| 2746 | |
| 2747 | /* |
| 2748 | * Both the source and target must be within the same filesystem and |
| 2749 | * in the same filesystem as their parent directories within the |
| 2750 | * namecache topology. |
| 2751 | * |
| 2752 | * NOTE: fromnd's nc_mount or nc_vp could be NULL. |
| 2753 | */ |
| 2754 | mp = fncpd->nc_mount; |
| 2755 | if (mp != tncpd->nc_mount || mp != fromnd->nl_ncp->nc_mount || |
| 2756 | mp != tond->nl_ncp->nc_mount) { |
| 2757 | cache_drop(fncpd); |
| 2758 | cache_drop(tncpd); |
| 2759 | return (EXDEV); |
| 2760 | } |
| 2761 | |
| 2762 | /* |
| 2763 | * If the target exists and either the source or target is a directory, |
| 2764 | * then both must be directories. |
| 2765 | * |
| 2766 | * Due to relocking of the source, fromnd->nl_ncp->nc_vp might have |
| 2767 | * become NULL. |
| 2768 | */ |
| 2769 | if (tond->nl_ncp->nc_vp) { |
| 2770 | if (fromnd->nl_ncp->nc_vp == NULL) { |
| 2771 | error = ENOENT; |
| 2772 | } else if (fromnd->nl_ncp->nc_vp->v_type == VDIR) { |
| 2773 | if (tond->nl_ncp->nc_vp->v_type != VDIR) |
| 2774 | error = ENOTDIR; |
| 2775 | } else if (tond->nl_ncp->nc_vp->v_type == VDIR) { |
| 2776 | error = EISDIR; |
| 2777 | } |
| 2778 | } |
| 2779 | |
| 2780 | /* |
| 2781 | * You cannot rename a source into itself or a subdirectory of itself. |
| 2782 | * We check this by travsersing the target directory upwards looking |
| 2783 | * for a match against the source. |
| 2784 | */ |
| 2785 | if (error == 0) { |
| 2786 | for (ncp = tncpd; ncp; ncp = ncp->nc_parent) { |
| 2787 | if (fromnd->nl_ncp == ncp) { |
| 2788 | error = EINVAL; |
| 2789 | break; |
| 2790 | } |
| 2791 | } |
| 2792 | } |
| 2793 | |
| 2794 | cache_drop(fncpd); |
| 2795 | cache_drop(tncpd); |
| 2796 | |
| 2797 | /* |
| 2798 | * Even though the namespaces are different, they may still represent |
| 2799 | * hardlinks to the same file. The filesystem might have a hard time |
| 2800 | * with this so we issue a NREMOVE of the source instead of a NRENAME |
| 2801 | * when we detect the situation. |
| 2802 | */ |
| 2803 | if (error == 0) { |
| 2804 | if (fromnd->nl_ncp->nc_vp == tond->nl_ncp->nc_vp) { |
| 2805 | error = VOP_NREMOVE(fromnd->nl_ncp, fromnd->nl_cred); |
| 2806 | } else { |
| 2807 | error = VOP_NRENAME(fromnd->nl_ncp, tond->nl_ncp, |
| 2808 | tond->nl_cred); |
| 2809 | } |
| 2810 | } |
| 2811 | return (error); |
| 2812 | } |
| 2813 | |
| 2814 | /* |
| 2815 | * rename_args(char *from, char *to) |
| 2816 | * |
| 2817 | * Rename files. Source and destination must either both be directories, |
| 2818 | * or both not be directories. If target is a directory, it must be empty. |
| 2819 | */ |
| 2820 | int |
| 2821 | sys_rename(struct rename_args *uap) |
| 2822 | { |
| 2823 | struct nlookupdata fromnd, tond; |
| 2824 | int error; |
| 2825 | |
| 2826 | error = nlookup_init(&fromnd, uap->from, UIO_USERSPACE, 0); |
| 2827 | if (error == 0) { |
| 2828 | error = nlookup_init(&tond, uap->to, UIO_USERSPACE, 0); |
| 2829 | if (error == 0) |
| 2830 | error = kern_rename(&fromnd, &tond); |
| 2831 | nlookup_done(&tond); |
| 2832 | } |
| 2833 | nlookup_done(&fromnd); |
| 2834 | return (error); |
| 2835 | } |
| 2836 | |
| 2837 | int |
| 2838 | kern_mkdir(struct nlookupdata *nd, int mode) |
| 2839 | { |
| 2840 | struct thread *td = curthread; |
| 2841 | struct proc *p = td->td_proc; |
| 2842 | struct namecache *ncp; |
| 2843 | struct vnode *vp; |
| 2844 | struct vattr vattr; |
| 2845 | int error; |
| 2846 | |
| 2847 | bwillwrite(); |
| 2848 | nd->nl_flags |= NLC_WILLBEDIR | NLC_CREATE; |
| 2849 | if ((error = nlookup(nd)) != 0) |
| 2850 | return (error); |
| 2851 | |
| 2852 | ncp = nd->nl_ncp; |
| 2853 | if (ncp->nc_vp) |
| 2854 | return (EEXIST); |
| 2855 | |
| 2856 | VATTR_NULL(&vattr); |
| 2857 | vattr.va_type = VDIR; |
| 2858 | vattr.va_mode = (mode & ACCESSPERMS) &~ p->p_fd->fd_cmask; |
| 2859 | |
| 2860 | vp = NULL; |
| 2861 | error = VOP_NMKDIR(ncp, &vp, p->p_ucred, &vattr); |
| 2862 | if (error == 0) |
| 2863 | vput(vp); |
| 2864 | return (error); |
| 2865 | } |
| 2866 | |
| 2867 | /* |
| 2868 | * mkdir_args(char *path, int mode) |
| 2869 | * |
| 2870 | * Make a directory file. |
| 2871 | */ |
| 2872 | /* ARGSUSED */ |
| 2873 | int |
| 2874 | sys_mkdir(struct mkdir_args *uap) |
| 2875 | { |
| 2876 | struct nlookupdata nd; |
| 2877 | int error; |
| 2878 | |
| 2879 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 2880 | if (error == 0) |
| 2881 | error = kern_mkdir(&nd, uap->mode); |
| 2882 | nlookup_done(&nd); |
| 2883 | return (error); |
| 2884 | } |
| 2885 | |
| 2886 | int |
| 2887 | kern_rmdir(struct nlookupdata *nd) |
| 2888 | { |
| 2889 | struct namecache *ncp; |
| 2890 | int error; |
| 2891 | |
| 2892 | bwillwrite(); |
| 2893 | nd->nl_flags |= NLC_DELETE; |
| 2894 | if ((error = nlookup(nd)) != 0) |
| 2895 | return (error); |
| 2896 | |
| 2897 | ncp = nd->nl_ncp; |
| 2898 | error = VOP_NRMDIR(ncp, nd->nl_cred); |
| 2899 | return (error); |
| 2900 | } |
| 2901 | |
| 2902 | /* |
| 2903 | * rmdir_args(char *path) |
| 2904 | * |
| 2905 | * Remove a directory file. |
| 2906 | */ |
| 2907 | /* ARGSUSED */ |
| 2908 | int |
| 2909 | sys_rmdir(struct rmdir_args *uap) |
| 2910 | { |
| 2911 | struct nlookupdata nd; |
| 2912 | int error; |
| 2913 | |
| 2914 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, 0); |
| 2915 | if (error == 0) |
| 2916 | error = kern_rmdir(&nd); |
| 2917 | nlookup_done(&nd); |
| 2918 | return (error); |
| 2919 | } |
| 2920 | |
| 2921 | int |
| 2922 | kern_getdirentries(int fd, char *buf, u_int count, long *basep, int *res, |
| 2923 | enum uio_seg direction) |
| 2924 | { |
| 2925 | struct thread *td = curthread; |
| 2926 | struct proc *p = td->td_proc; |
| 2927 | struct vnode *vp; |
| 2928 | struct file *fp; |
| 2929 | struct uio auio; |
| 2930 | struct iovec aiov; |
| 2931 | long loff; |
| 2932 | int error, eofflag; |
| 2933 | |
| 2934 | if ((error = holdvnode(p->p_fd, fd, &fp)) != 0) |
| 2935 | return (error); |
| 2936 | if ((fp->f_flag & FREAD) == 0) { |
| 2937 | error = EBADF; |
| 2938 | goto done; |
| 2939 | } |
| 2940 | vp = (struct vnode *)fp->f_data; |
| 2941 | unionread: |
| 2942 | if (vp->v_type != VDIR) { |
| 2943 | error = EINVAL; |
| 2944 | goto done; |
| 2945 | } |
| 2946 | aiov.iov_base = buf; |
| 2947 | aiov.iov_len = count; |
| 2948 | auio.uio_iov = &aiov; |
| 2949 | auio.uio_iovcnt = 1; |
| 2950 | auio.uio_rw = UIO_READ; |
| 2951 | auio.uio_segflg = direction; |
| 2952 | auio.uio_td = td; |
| 2953 | auio.uio_resid = count; |
| 2954 | /* vn_lock(vp, LK_SHARED | LK_RETRY); */ |
| 2955 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 2956 | loff = auio.uio_offset = fp->f_offset; |
| 2957 | error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL); |
| 2958 | fp->f_offset = auio.uio_offset; |
| 2959 | VOP_UNLOCK(vp, 0); |
| 2960 | if (error) |
| 2961 | goto done; |
| 2962 | if (count == auio.uio_resid) { |
| 2963 | if (union_dircheckp) { |
| 2964 | error = union_dircheckp(td, &vp, fp); |
| 2965 | if (error == -1) |
| 2966 | goto unionread; |
| 2967 | if (error) |
| 2968 | goto done; |
| 2969 | } |
| 2970 | if ((vp->v_flag & VROOT) && |
| 2971 | (vp->v_mount->mnt_flag & MNT_UNION)) { |
| 2972 | struct vnode *tvp = vp; |
| 2973 | vp = vp->v_mount->mnt_vnodecovered; |
| 2974 | vref(vp); |
| 2975 | fp->f_data = vp; |
| 2976 | fp->f_offset = 0; |
| 2977 | vrele(tvp); |
| 2978 | goto unionread; |
| 2979 | } |
| 2980 | } |
| 2981 | if (basep) { |
| 2982 | *basep = loff; |
| 2983 | } |
| 2984 | *res = count - auio.uio_resid; |
| 2985 | done: |
| 2986 | fdrop(fp); |
| 2987 | return (error); |
| 2988 | } |
| 2989 | |
| 2990 | /* |
| 2991 | * getdirentries_args(int fd, char *buf, u_int conut, long *basep) |
| 2992 | * |
| 2993 | * Read a block of directory entries in a file system independent format. |
| 2994 | */ |
| 2995 | int |
| 2996 | sys_getdirentries(struct getdirentries_args *uap) |
| 2997 | { |
| 2998 | long base; |
| 2999 | int error; |
| 3000 | |
| 3001 | error = kern_getdirentries(uap->fd, uap->buf, uap->count, &base, |
| 3002 | &uap->sysmsg_result, UIO_USERSPACE); |
| 3003 | |
| 3004 | if (error == 0) |
| 3005 | error = copyout(&base, uap->basep, sizeof(*uap->basep)); |
| 3006 | return (error); |
| 3007 | } |
| 3008 | |
| 3009 | /* |
| 3010 | * getdents_args(int fd, char *buf, size_t count) |
| 3011 | */ |
| 3012 | int |
| 3013 | sys_getdents(struct getdents_args *uap) |
| 3014 | { |
| 3015 | int error; |
| 3016 | |
| 3017 | error = kern_getdirentries(uap->fd, uap->buf, uap->count, NULL, |
| 3018 | &uap->sysmsg_result, UIO_USERSPACE); |
| 3019 | |
| 3020 | return (error); |
| 3021 | } |
| 3022 | |
| 3023 | /* |
| 3024 | * umask(int newmask) |
| 3025 | * |
| 3026 | * Set the mode mask for creation of filesystem nodes. |
| 3027 | * |
| 3028 | * MP SAFE |
| 3029 | */ |
| 3030 | int |
| 3031 | sys_umask(struct umask_args *uap) |
| 3032 | { |
| 3033 | struct thread *td = curthread; |
| 3034 | struct proc *p = td->td_proc; |
| 3035 | struct filedesc *fdp; |
| 3036 | |
| 3037 | fdp = p->p_fd; |
| 3038 | uap->sysmsg_result = fdp->fd_cmask; |
| 3039 | fdp->fd_cmask = uap->newmask & ALLPERMS; |
| 3040 | return (0); |
| 3041 | } |
| 3042 | |
| 3043 | /* |
| 3044 | * revoke(char *path) |
| 3045 | * |
| 3046 | * Void all references to file by ripping underlying filesystem |
| 3047 | * away from vnode. |
| 3048 | */ |
| 3049 | /* ARGSUSED */ |
| 3050 | int |
| 3051 | sys_revoke(struct revoke_args *uap) |
| 3052 | { |
| 3053 | struct nlookupdata nd; |
| 3054 | struct vattr vattr; |
| 3055 | struct vnode *vp; |
| 3056 | struct ucred *cred; |
| 3057 | int error; |
| 3058 | |
| 3059 | vp = NULL; |
| 3060 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 3061 | if (error == 0) |
| 3062 | error = nlookup(&nd); |
| 3063 | if (error == 0) |
| 3064 | error = cache_vref(nd.nl_ncp, nd.nl_cred, &vp); |
| 3065 | cred = crhold(nd.nl_cred); |
| 3066 | nlookup_done(&nd); |
| 3067 | if (error == 0) { |
| 3068 | if (vp->v_type != VCHR && vp->v_type != VBLK) |
| 3069 | error = EINVAL; |
| 3070 | if (error == 0) |
| 3071 | error = VOP_GETATTR(vp, &vattr); |
| 3072 | if (error == 0 && cred->cr_uid != vattr.va_uid) |
| 3073 | error = suser_cred(cred, PRISON_ROOT); |
| 3074 | if (error == 0 && count_udev(vp->v_udev) > 0) { |
| 3075 | error = 0; |
| 3076 | vx_lock(vp); |
| 3077 | VOP_REVOKE(vp, REVOKEALL); |
| 3078 | vx_unlock(vp); |
| 3079 | } |
| 3080 | vrele(vp); |
| 3081 | } |
| 3082 | if (cred) |
| 3083 | crfree(cred); |
| 3084 | return (error); |
| 3085 | } |
| 3086 | |
| 3087 | /* |
| 3088 | * getfh_args(char *fname, fhandle_t *fhp) |
| 3089 | * |
| 3090 | * Get (NFS) file handle |
| 3091 | */ |
| 3092 | int |
| 3093 | sys_getfh(struct getfh_args *uap) |
| 3094 | { |
| 3095 | struct thread *td = curthread; |
| 3096 | struct nlookupdata nd; |
| 3097 | fhandle_t fh; |
| 3098 | struct vnode *vp; |
| 3099 | int error; |
| 3100 | |
| 3101 | /* |
| 3102 | * Must be super user |
| 3103 | */ |
| 3104 | if ((error = suser(td)) != 0) |
| 3105 | return (error); |
| 3106 | |
| 3107 | vp = NULL; |
| 3108 | error = nlookup_init(&nd, uap->fname, UIO_USERSPACE, NLC_FOLLOW); |
| 3109 | if (error == 0) |
| 3110 | error = nlookup(&nd); |
| 3111 | if (error == 0) |
| 3112 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 3113 | nlookup_done(&nd); |
| 3114 | if (error == 0) { |
| 3115 | bzero(&fh, sizeof(fh)); |
| 3116 | fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; |
| 3117 | error = VFS_VPTOFH(vp, &fh.fh_fid); |
| 3118 | vput(vp); |
| 3119 | if (error == 0) |
| 3120 | error = copyout(&fh, uap->fhp, sizeof(fh)); |
| 3121 | } |
| 3122 | return (error); |
| 3123 | } |
| 3124 | |
| 3125 | /* |
| 3126 | * fhopen_args(const struct fhandle *u_fhp, int flags) |
| 3127 | * |
| 3128 | * syscall for the rpc.lockd to use to translate a NFS file handle into |
| 3129 | * an open descriptor. |
| 3130 | * |
| 3131 | * warning: do not remove the suser() call or this becomes one giant |
| 3132 | * security hole. |
| 3133 | */ |
| 3134 | int |
| 3135 | sys_fhopen(struct fhopen_args *uap) |
| 3136 | { |
| 3137 | struct thread *td = curthread; |
| 3138 | struct proc *p = td->td_proc; |
| 3139 | struct mount *mp; |
| 3140 | struct vnode *vp; |
| 3141 | struct fhandle fhp; |
| 3142 | struct vattr vat; |
| 3143 | struct vattr *vap = &vat; |
| 3144 | struct flock lf; |
| 3145 | int fmode, mode, error, type; |
| 3146 | struct file *nfp; |
| 3147 | struct file *fp; |
| 3148 | int indx; |
| 3149 | |
| 3150 | /* |
| 3151 | * Must be super user |
| 3152 | */ |
| 3153 | error = suser(td); |
| 3154 | if (error) |
| 3155 | return (error); |
| 3156 | |
| 3157 | fmode = FFLAGS(uap->flags); |
| 3158 | /* why not allow a non-read/write open for our lockd? */ |
| 3159 | if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) |
| 3160 | return (EINVAL); |
| 3161 | error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); |
| 3162 | if (error) |
| 3163 | return(error); |
| 3164 | /* find the mount point */ |
| 3165 | mp = vfs_getvfs(&fhp.fh_fsid); |
| 3166 | if (mp == NULL) |
| 3167 | return (ESTALE); |
| 3168 | /* now give me my vnode, it gets returned to me locked */ |
| 3169 | error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp); |
| 3170 | if (error) |
| 3171 | return (error); |
| 3172 | /* |
| 3173 | * from now on we have to make sure not |
| 3174 | * to forget about the vnode |
| 3175 | * any error that causes an abort must vput(vp) |
| 3176 | * just set error = err and 'goto bad;'. |
| 3177 | */ |
| 3178 | |
| 3179 | /* |
| 3180 | * from vn_open |
| 3181 | */ |
| 3182 | if (vp->v_type == VLNK) { |
| 3183 | error = EMLINK; |
| 3184 | goto bad; |
| 3185 | } |
| 3186 | if (vp->v_type == VSOCK) { |
| 3187 | error = EOPNOTSUPP; |
| 3188 | goto bad; |
| 3189 | } |
| 3190 | mode = 0; |
| 3191 | if (fmode & (FWRITE | O_TRUNC)) { |
| 3192 | if (vp->v_type == VDIR) { |
| 3193 | error = EISDIR; |
| 3194 | goto bad; |
| 3195 | } |
| 3196 | error = vn_writechk(vp); |
| 3197 | if (error) |
| 3198 | goto bad; |
| 3199 | mode |= VWRITE; |
| 3200 | } |
| 3201 | if (fmode & FREAD) |
| 3202 | mode |= VREAD; |
| 3203 | if (mode) { |
| 3204 | error = VOP_ACCESS(vp, mode, p->p_ucred); |
| 3205 | if (error) |
| 3206 | goto bad; |
| 3207 | } |
| 3208 | if (fmode & O_TRUNC) { |
| 3209 | VOP_UNLOCK(vp, 0); /* XXX */ |
| 3210 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ |
| 3211 | VATTR_NULL(vap); |
| 3212 | vap->va_size = 0; |
| 3213 | error = VOP_SETATTR(vp, vap, p->p_ucred); |
| 3214 | if (error) |
| 3215 | goto bad; |
| 3216 | } |
| 3217 | |
| 3218 | /* |
| 3219 | * VOP_OPEN needs the file pointer so it can potentially override |
| 3220 | * it. |
| 3221 | * |
| 3222 | * WARNING! no f_ncp will be associated when fhopen()ing a directory. |
| 3223 | * XXX |
| 3224 | */ |
| 3225 | if ((error = falloc(p, &nfp, &indx)) != 0) |
| 3226 | goto bad; |
| 3227 | fp = nfp; |
| 3228 | |
| 3229 | error = VOP_OPEN(vp, fmode, p->p_ucred, fp); |
| 3230 | if (error) { |
| 3231 | /* |
| 3232 | * setting f_ops this way prevents VOP_CLOSE from being |
| 3233 | * called or fdrop() releasing the vp from v_data. Since |
| 3234 | * the VOP_OPEN failed we don't want to VOP_CLOSE. |
| 3235 | */ |
| 3236 | fp->f_ops = &badfileops; |
| 3237 | fp->f_data = NULL; |
| 3238 | goto bad_drop; |
| 3239 | } |
| 3240 | |
| 3241 | /* |
| 3242 | * The fp is given its own reference, we still have our ref and lock. |
| 3243 | * |
| 3244 | * Assert that all regular files must be created with a VM object. |
| 3245 | */ |
| 3246 | if (vp->v_type == VREG && vp->v_object == NULL) { |
| 3247 | printf("fhopen: regular file did not have VM object: %p\n", vp); |
| 3248 | goto bad_drop; |
| 3249 | } |
| 3250 | |
| 3251 | /* |
| 3252 | * The open was successful. Handle any locking requirements. |
| 3253 | */ |
| 3254 | if (fmode & (O_EXLOCK | O_SHLOCK)) { |
| 3255 | lf.l_whence = SEEK_SET; |
| 3256 | lf.l_start = 0; |
| 3257 | lf.l_len = 0; |
| 3258 | if (fmode & O_EXLOCK) |
| 3259 | lf.l_type = F_WRLCK; |
| 3260 | else |
| 3261 | lf.l_type = F_RDLCK; |
| 3262 | if (fmode & FNONBLOCK) |
| 3263 | type = 0; |
| 3264 | else |
| 3265 | type = F_WAIT; |
| 3266 | VOP_UNLOCK(vp, 0); |
| 3267 | if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { |
| 3268 | /* |
| 3269 | * release our private reference. |
| 3270 | */ |
| 3271 | fsetfd(p, NULL, indx); |
| 3272 | fdrop(fp); |
| 3273 | vrele(vp); |
| 3274 | return (error); |
| 3275 | } |
| 3276 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 3277 | fp->f_flag |= FHASLOCK; |
| 3278 | } |
| 3279 | |
| 3280 | /* |
| 3281 | * Clean up. Associate the file pointer with the previously |
| 3282 | * reserved descriptor and return it. |
| 3283 | */ |
| 3284 | vput(vp); |
| 3285 | fsetfd(p, fp, indx); |
| 3286 | fdrop(fp); |
| 3287 | uap->sysmsg_result = indx; |
| 3288 | return (0); |
| 3289 | |
| 3290 | bad_drop: |
| 3291 | fsetfd(p, NULL, indx); |
| 3292 | fdrop(fp); |
| 3293 | bad: |
| 3294 | vput(vp); |
| 3295 | return (error); |
| 3296 | } |
| 3297 | |
| 3298 | /* |
| 3299 | * fhstat_args(struct fhandle *u_fhp, struct stat *sb) |
| 3300 | */ |
| 3301 | int |
| 3302 | sys_fhstat(struct fhstat_args *uap) |
| 3303 | { |
| 3304 | struct thread *td = curthread; |
| 3305 | struct stat sb; |
| 3306 | fhandle_t fh; |
| 3307 | struct mount *mp; |
| 3308 | struct vnode *vp; |
| 3309 | int error; |
| 3310 | |
| 3311 | /* |
| 3312 | * Must be super user |
| 3313 | */ |
| 3314 | error = suser(td); |
| 3315 | if (error) |
| 3316 | return (error); |
| 3317 | |
| 3318 | error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); |
| 3319 | if (error) |
| 3320 | return (error); |
| 3321 | |
| 3322 | if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) |
| 3323 | return (ESTALE); |
| 3324 | if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) |
| 3325 | return (error); |
| 3326 | error = vn_stat(vp, &sb, td->td_proc->p_ucred); |
| 3327 | vput(vp); |
| 3328 | if (error) |
| 3329 | return (error); |
| 3330 | error = copyout(&sb, uap->sb, sizeof(sb)); |
| 3331 | return (error); |
| 3332 | } |
| 3333 | |
| 3334 | /* |
| 3335 | * fhstatfs_args(struct fhandle *u_fhp, struct statfs *buf) |
| 3336 | */ |
| 3337 | int |
| 3338 | sys_fhstatfs(struct fhstatfs_args *uap) |
| 3339 | { |
| 3340 | struct thread *td = curthread; |
| 3341 | struct proc *p = td->td_proc; |
| 3342 | struct statfs *sp; |
| 3343 | struct mount *mp; |
| 3344 | struct vnode *vp; |
| 3345 | struct statfs sb; |
| 3346 | char *fullpath, *freepath; |
| 3347 | fhandle_t fh; |
| 3348 | int error; |
| 3349 | |
| 3350 | /* |
| 3351 | * Must be super user |
| 3352 | */ |
| 3353 | if ((error = suser(td))) |
| 3354 | return (error); |
| 3355 | |
| 3356 | if ((error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t))) != 0) |
| 3357 | return (error); |
| 3358 | |
| 3359 | if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) |
| 3360 | return (ESTALE); |
| 3361 | |
| 3362 | if (p != NULL && (p->p_fd->fd_nrdir->nc_flag & NCF_ROOT) == 0 && |
| 3363 | !chroot_visible_mnt(mp, p)) |
| 3364 | return (ESTALE); |
| 3365 | |
| 3366 | if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) |
| 3367 | return (error); |
| 3368 | mp = vp->v_mount; |
| 3369 | sp = &mp->mnt_stat; |
| 3370 | vput(vp); |
| 3371 | if ((error = VFS_STATFS(mp, sp, p->p_ucred)) != 0) |
| 3372 | return (error); |
| 3373 | |
| 3374 | error = cache_fullpath(p, mp->mnt_ncp, &fullpath, &freepath); |
| 3375 | if (error) |
| 3376 | return(error); |
| 3377 | bzero(sp->f_mntonname, sizeof(sp->f_mntonname)); |
| 3378 | strlcpy(sp->f_mntonname, fullpath, sizeof(sp->f_mntonname)); |
| 3379 | free(freepath, M_TEMP); |
| 3380 | |
| 3381 | sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; |
| 3382 | if (suser(td)) { |
| 3383 | bcopy(sp, &sb, sizeof(sb)); |
| 3384 | sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; |
| 3385 | sp = &sb; |
| 3386 | } |
| 3387 | return (copyout(sp, uap->buf, sizeof(*sp))); |
| 3388 | } |
| 3389 | |
| 3390 | /* |
| 3391 | * Syscall to push extended attribute configuration information into the |
| 3392 | * VFS. Accepts a path, which it converts to a mountpoint, as well as |
| 3393 | * a command (int cmd), and attribute name and misc data. For now, the |
| 3394 | * attribute name is left in userspace for consumption by the VFS_op. |
| 3395 | * It will probably be changed to be copied into sysspace by the |
| 3396 | * syscall in the future, once issues with various consumers of the |
| 3397 | * attribute code have raised their hands. |
| 3398 | * |
| 3399 | * Currently this is used only by UFS Extended Attributes. |
| 3400 | */ |
| 3401 | int |
| 3402 | sys_extattrctl(struct extattrctl_args *uap) |
| 3403 | { |
| 3404 | struct nlookupdata nd; |
| 3405 | struct mount *mp; |
| 3406 | struct vnode *vp; |
| 3407 | int error; |
| 3408 | |
| 3409 | vp = NULL; |
| 3410 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 3411 | if (error == 0) |
| 3412 | error = nlookup(&nd); |
| 3413 | if (error == 0) { |
| 3414 | mp = nd.nl_ncp->nc_mount; |
| 3415 | error = VFS_EXTATTRCTL(mp, uap->cmd, |
| 3416 | uap->attrname, uap->arg, |
| 3417 | nd.nl_cred); |
| 3418 | } |
| 3419 | nlookup_done(&nd); |
| 3420 | return (error); |
| 3421 | } |
| 3422 | |
| 3423 | /* |
| 3424 | * Syscall to set a named extended attribute on a file or directory. |
| 3425 | * Accepts attribute name, and a uio structure pointing to the data to set. |
| 3426 | * The uio is consumed in the style of writev(). The real work happens |
| 3427 | * in VOP_SETEXTATTR(). |
| 3428 | */ |
| 3429 | int |
| 3430 | sys_extattr_set_file(struct extattr_set_file_args *uap) |
| 3431 | { |
| 3432 | char attrname[EXTATTR_MAXNAMELEN]; |
| 3433 | struct iovec aiov[UIO_SMALLIOV]; |
| 3434 | struct iovec *needfree; |
| 3435 | struct nlookupdata nd; |
| 3436 | struct iovec *iov; |
| 3437 | struct vnode *vp; |
| 3438 | struct uio auio; |
| 3439 | u_int iovlen; |
| 3440 | u_int cnt; |
| 3441 | int error; |
| 3442 | int i; |
| 3443 | |
| 3444 | error = copyin(uap->attrname, attrname, EXTATTR_MAXNAMELEN); |
| 3445 | if (error) |
| 3446 | return (error); |
| 3447 | |
| 3448 | vp = NULL; |
| 3449 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 3450 | if (error == 0) |
| 3451 | error = nlookup(&nd); |
| 3452 | if (error == 0) |
| 3453 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 3454 | if (error) { |
| 3455 | nlookup_done(&nd); |
| 3456 | return (error); |
| 3457 | } |
| 3458 | |
| 3459 | needfree = NULL; |
| 3460 | iovlen = uap->iovcnt * sizeof(struct iovec); |
| 3461 | if (uap->iovcnt > UIO_SMALLIOV) { |
| 3462 | if (uap->iovcnt > UIO_MAXIOV) { |
| 3463 | error = EINVAL; |
| 3464 | goto done; |
| 3465 | } |
| 3466 | MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); |
| 3467 | needfree = iov; |
| 3468 | } else { |
| 3469 | iov = aiov; |
| 3470 | } |
| 3471 | auio.uio_iov = iov; |
| 3472 | auio.uio_iovcnt = uap->iovcnt; |
| 3473 | auio.uio_rw = UIO_WRITE; |
| 3474 | auio.uio_segflg = UIO_USERSPACE; |
| 3475 | auio.uio_td = nd.nl_td; |
| 3476 | auio.uio_offset = 0; |
| 3477 | if ((error = copyin(uap->iovp, iov, iovlen))) |
| 3478 | goto done; |
| 3479 | auio.uio_resid = 0; |
| 3480 | for (i = 0; i < uap->iovcnt; i++) { |
| 3481 | if (iov->iov_len > INT_MAX - auio.uio_resid) { |
| 3482 | error = EINVAL; |
| 3483 | goto done; |
| 3484 | } |
| 3485 | auio.uio_resid += iov->iov_len; |
| 3486 | iov++; |
| 3487 | } |
| 3488 | cnt = auio.uio_resid; |
| 3489 | error = VOP_SETEXTATTR(vp, attrname, &auio, nd.nl_cred); |
| 3490 | cnt -= auio.uio_resid; |
| 3491 | uap->sysmsg_result = cnt; |
| 3492 | done: |
| 3493 | vput(vp); |
| 3494 | nlookup_done(&nd); |
| 3495 | if (needfree) |
| 3496 | FREE(needfree, M_IOV); |
| 3497 | return (error); |
| 3498 | } |
| 3499 | |
| 3500 | /* |
| 3501 | * Syscall to get a named extended attribute on a file or directory. |
| 3502 | * Accepts attribute name, and a uio structure pointing to a buffer for the |
| 3503 | * data. The uio is consumed in the style of readv(). The real work |
| 3504 | * happens in VOP_GETEXTATTR(); |
| 3505 | */ |
| 3506 | int |
| 3507 | sys_extattr_get_file(struct extattr_get_file_args *uap) |
| 3508 | { |
| 3509 | char attrname[EXTATTR_MAXNAMELEN]; |
| 3510 | struct iovec aiov[UIO_SMALLIOV]; |
| 3511 | struct iovec *needfree; |
| 3512 | struct nlookupdata nd; |
| 3513 | struct iovec *iov; |
| 3514 | struct vnode *vp; |
| 3515 | struct uio auio; |
| 3516 | u_int iovlen; |
| 3517 | u_int cnt; |
| 3518 | int error; |
| 3519 | int i; |
| 3520 | |
| 3521 | error = copyin(uap->attrname, attrname, EXTATTR_MAXNAMELEN); |
| 3522 | if (error) |
| 3523 | return (error); |
| 3524 | |
| 3525 | vp = NULL; |
| 3526 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 3527 | if (error == 0) |
| 3528 | error = nlookup(&nd); |
| 3529 | if (error == 0) |
| 3530 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 3531 | if (error) { |
| 3532 | nlookup_done(&nd); |
| 3533 | return (error); |
| 3534 | } |
| 3535 | |
| 3536 | iovlen = uap->iovcnt * sizeof (struct iovec); |
| 3537 | needfree = NULL; |
| 3538 | if (uap->iovcnt > UIO_SMALLIOV) { |
| 3539 | if (uap->iovcnt > UIO_MAXIOV) { |
| 3540 | error = EINVAL; |
| 3541 | goto done; |
| 3542 | } |
| 3543 | MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); |
| 3544 | needfree = iov; |
| 3545 | } else { |
| 3546 | iov = aiov; |
| 3547 | } |
| 3548 | auio.uio_iov = iov; |
| 3549 | auio.uio_iovcnt = uap->iovcnt; |
| 3550 | auio.uio_rw = UIO_READ; |
| 3551 | auio.uio_segflg = UIO_USERSPACE; |
| 3552 | auio.uio_td = nd.nl_td; |
| 3553 | auio.uio_offset = 0; |
| 3554 | if ((error = copyin(uap->iovp, iov, iovlen))) |
| 3555 | goto done; |
| 3556 | auio.uio_resid = 0; |
| 3557 | for (i = 0; i < uap->iovcnt; i++) { |
| 3558 | if (iov->iov_len > INT_MAX - auio.uio_resid) { |
| 3559 | error = EINVAL; |
| 3560 | goto done; |
| 3561 | } |
| 3562 | auio.uio_resid += iov->iov_len; |
| 3563 | iov++; |
| 3564 | } |
| 3565 | cnt = auio.uio_resid; |
| 3566 | error = VOP_GETEXTATTR(vp, attrname, &auio, nd.nl_cred); |
| 3567 | cnt -= auio.uio_resid; |
| 3568 | uap->sysmsg_result = cnt; |
| 3569 | done: |
| 3570 | vput(vp); |
| 3571 | nlookup_done(&nd); |
| 3572 | if (needfree) |
| 3573 | FREE(needfree, M_IOV); |
| 3574 | return(error); |
| 3575 | } |
| 3576 | |
| 3577 | /* |
| 3578 | * Syscall to delete a named extended attribute from a file or directory. |
| 3579 | * Accepts attribute name. The real work happens in VOP_SETEXTATTR(). |
| 3580 | */ |
| 3581 | int |
| 3582 | sys_extattr_delete_file(struct extattr_delete_file_args *uap) |
| 3583 | { |
| 3584 | char attrname[EXTATTR_MAXNAMELEN]; |
| 3585 | struct nlookupdata nd; |
| 3586 | struct vnode *vp; |
| 3587 | int error; |
| 3588 | |
| 3589 | error = copyin(uap->attrname, attrname, EXTATTR_MAXNAMELEN); |
| 3590 | if (error) |
| 3591 | return(error); |
| 3592 | |
| 3593 | vp = NULL; |
| 3594 | error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW); |
| 3595 | if (error == 0) |
| 3596 | error = nlookup(&nd); |
| 3597 | if (error == 0) |
| 3598 | error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); |
| 3599 | if (error) { |
| 3600 | nlookup_done(&nd); |
| 3601 | return (error); |
| 3602 | } |
| 3603 | |
| 3604 | error = VOP_SETEXTATTR(vp, attrname, NULL, nd.nl_cred); |
| 3605 | vput(vp); |
| 3606 | nlookup_done(&nd); |
| 3607 | return(error); |
| 3608 | } |
| 3609 | |
| 3610 | static int |
| 3611 | chroot_visible_mnt(struct mount *mp, struct proc *p) |
| 3612 | { |
| 3613 | struct namecache *ncp; |
| 3614 | /* |
| 3615 | * First check if this file system is below |
| 3616 | * the chroot path. |
| 3617 | */ |
| 3618 | ncp = mp->mnt_ncp; |
| 3619 | while (ncp != NULL && ncp != p->p_fd->fd_nrdir) |
| 3620 | ncp = ncp->nc_parent; |
| 3621 | if (ncp == NULL) { |
| 3622 | /* |
| 3623 | * This is not below the chroot path. |
| 3624 | * |
| 3625 | * Check if the chroot path is on the same filesystem, |
| 3626 | * by determing if we have to cross a mount point |
| 3627 | * before reaching mp->mnt_ncp. |
| 3628 | */ |
| 3629 | ncp = p->p_fd->fd_nrdir; |
| 3630 | while (ncp != NULL && ncp != mp->mnt_ncp) { |
| 3631 | if (ncp->nc_flag & NCF_MOUNTPT) { |
| 3632 | ncp = NULL; |
| 3633 | break; |
| 3634 | } |
| 3635 | ncp = ncp->nc_parent; |
| 3636 | } |
| 3637 | } |
| 3638 | return(ncp != NULL); |
| 3639 | } |