/* $NetBSD: vfs_syscalls.c,v 1.389 2009/02/22 20:28:06 ad Exp $ */ /*- * Copyright (c) 2008 The NetBSD Foundation, Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 */ #include __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.389 2009/02/22 20:28:06 ad Exp $"); #ifdef _KERNEL_OPT #include "opt_fileassoc.h" #include "veriexec.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef FILEASSOC #include #endif /* FILEASSOC */ #include #include #include #include #include #include #include #include #include #include #include #include MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); static int change_dir(struct nameidata *, struct lwp *); static int change_flags(struct vnode *, u_long, struct lwp *); static int change_mode(struct vnode *, int, struct lwp *l); static int change_owner(struct vnode *, uid_t, gid_t, struct lwp *, int); void checkdirs(struct vnode *); int dovfsusermount = 0; /* * Virtual File System System Calls */ /* * Mount a file system. */ /* * This table is used to maintain compatibility with 4.3BSD * and NetBSD 0.9 mount syscalls - and possibly other systems. * Note, the order is important! * * Do not modify this table. It should only contain filesystems * supported by NetBSD 0.9 and 4.3BSD. */ const char * const mountcompatnames[] = { NULL, /* 0 = MOUNT_NONE */ MOUNT_FFS, /* 1 = MOUNT_UFS */ MOUNT_NFS, /* 2 */ MOUNT_MFS, /* 3 */ MOUNT_MSDOS, /* 4 */ MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ MOUNT_FDESC, /* 6 */ MOUNT_KERNFS, /* 7 */ NULL, /* 8 = MOUNT_DEVFS */ MOUNT_AFS, /* 9 */ }; const int nmountcompatnames = sizeof(mountcompatnames) / sizeof(mountcompatnames[0]); static int mount_update(struct lwp *l, struct vnode *vp, const char *path, int flags, void *data, size_t *data_len) { struct mount *mp; int error = 0, saved_flags; mp = vp->v_mount; saved_flags = mp->mnt_flag; /* We can operate only on VV_ROOT nodes. */ if ((vp->v_vflag & VV_ROOT) == 0) { error = EINVAL; goto out; } /* * We only allow the filesystem to be reloaded if it * is currently mounted read-only. Additionally, we * prevent read-write to read-only downgrades. */ if ((flags & (MNT_RELOAD | MNT_RDONLY)) != 0 && (mp->mnt_flag & MNT_RDONLY) == 0) { error = EOPNOTSUPP; /* Needs translation */ goto out; } error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_UPDATE, mp, KAUTH_ARG(flags), data); if (error) goto out; if (vfs_busy(mp, NULL)) { error = EPERM; goto out; } mutex_enter(&mp->mnt_updating); mp->mnt_flag &= ~MNT_OP_FLAGS; mp->mnt_flag |= flags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); /* * Set the mount level flags. */ if (flags & MNT_RDONLY) mp->mnt_flag |= MNT_RDONLY; else if (mp->mnt_flag & MNT_RDONLY) mp->mnt_iflag |= IMNT_WANTRDWR; mp->mnt_flag &= ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | MNT_LOG); mp->mnt_flag |= flags & (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | MNT_LOG | MNT_IGNORE); error = VFS_MOUNT(mp, path, data, data_len); if (error && data != NULL) { int error2; /* * Update failed; let's try and see if it was an * export request. For compat with 3.0 and earlier. */ error2 = vfs_hooks_reexport(mp, path, data); /* * Only update error code if the export request was * understood but some problem occurred while * processing it. */ if (error2 != EJUSTRETURN) error = error2; } if (mp->mnt_iflag & IMNT_WANTRDWR) mp->mnt_flag &= ~MNT_RDONLY; if (error) mp->mnt_flag = saved_flags; mp->mnt_flag &= ~MNT_OP_FLAGS; mp->mnt_iflag &= ~IMNT_WANTRDWR; if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { if (mp->mnt_syncer == NULL) error = vfs_allocate_syncvnode(mp); } else { if (mp->mnt_syncer != NULL) vfs_deallocate_syncvnode(mp); } mutex_exit(&mp->mnt_updating); vfs_unbusy(mp, false, NULL); out: return (error); } static int mount_get_vfsops(const char *fstype, struct vfsops **vfsops) { char fstypename[sizeof(((struct statvfs *)NULL)->f_fstypename)]; int error; /* Copy file-system type from userspace. */ error = copyinstr(fstype, fstypename, sizeof(fstypename), NULL); if (error) { /* * Historically, filesystem types were identified by numbers. * If we get an integer for the filesystem type instead of a * string, we check to see if it matches one of the historic * filesystem types. */ u_long fsindex = (u_long)fstype; if (fsindex >= nmountcompatnames || mountcompatnames[fsindex] == NULL) return ENODEV; strlcpy(fstypename, mountcompatnames[fsindex], sizeof(fstypename)); } /* Accept `ufs' as an alias for `ffs', for compatibility. */ if (strcmp(fstypename, "ufs") == 0) fstypename[0] = 'f'; if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL) return 0; /* If we can autoload a vfs module, try again */ mutex_enter(&module_lock); (void)module_autoload(fstype, MODULE_CLASS_VFS); mutex_exit(&module_lock); if ((*vfsops = vfs_getopsbyname(fstypename)) != NULL) return 0; return ENODEV; } static int mount_domount(struct lwp *l, struct vnode **vpp, struct vfsops *vfsops, const char *path, int flags, void *data, size_t *data_len, u_int recurse) { struct mount *mp; struct vnode *vp = *vpp; struct vattr va; int error; error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_NEW, vp, KAUTH_ARG(flags), data); if (error) return error; /* Can't make a non-dir a mount-point (from here anyway). */ if (vp->v_type != VDIR) return ENOTDIR; /* * If the user is not root, ensure that they own the directory * onto which we are attempting to mount. */ if ((error = VOP_GETATTR(vp, &va, l->l_cred)) != 0 || (va.va_uid != kauth_cred_geteuid(l->l_cred) && (error = kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL)) != 0)) { return error; } if (flags & MNT_EXPORTED) return EINVAL; if ((error = vinvalbuf(vp, V_SAVE, l->l_cred, l, 0, 0)) != 0) return error; /* * Check if a file-system is not already mounted on this vnode. */ if (vp->v_mountedhere != NULL) return EBUSY; mp = kmem_zalloc(sizeof(*mp), KM_SLEEP); if (mp == NULL) return ENOMEM; mp->mnt_op = vfsops; mp->mnt_refcnt = 1; TAILQ_INIT(&mp->mnt_vnodelist); rw_init(&mp->mnt_unmounting); mutex_init(&mp->mnt_renamelock, MUTEX_DEFAULT, IPL_NONE); mutex_init(&mp->mnt_updating, MUTEX_DEFAULT, IPL_NONE); error = vfs_busy(mp, NULL); KASSERT(error == 0); mutex_enter(&mp->mnt_updating); mp->mnt_vnodecovered = vp; mp->mnt_stat.f_owner = kauth_cred_geteuid(l->l_cred); mount_initspecific(mp); /* * The underlying file system may refuse the mount for * various reasons. Allow the user to force it to happen. * * Set the mount level flags. */ mp->mnt_flag = flags & (MNT_FORCE | MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | MNT_LOG | MNT_IGNORE | MNT_RDONLY); error = VFS_MOUNT(mp, path, data, data_len); mp->mnt_flag &= ~MNT_OP_FLAGS; /* * Put the new filesystem on the mount list after root. */ cache_purge(vp); if (error != 0) { vp->v_mountedhere = NULL; mutex_exit(&mp->mnt_updating); vfs_unbusy(mp, false, NULL); vfs_destroy(mp); return error; } mp->mnt_iflag &= ~IMNT_WANTRDWR; mutex_enter(&mountlist_lock); vp->v_mountedhere = mp; CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); mutex_exit(&mountlist_lock); vn_restorerecurse(vp, recurse); VOP_UNLOCK(vp, 0); checkdirs(vp); if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) error = vfs_allocate_syncvnode(mp); /* Hold an additional reference to the mount across VFS_START(). */ mutex_exit(&mp->mnt_updating); vfs_unbusy(mp, true, NULL); (void) VFS_STATVFS(mp, &mp->mnt_stat); error = VFS_START(mp, 0); if (error) vrele(vp); /* Drop reference held for VFS_START(). */ vfs_destroy(mp); *vpp = NULL; return error; } static int mount_getargs(struct lwp *l, struct vnode *vp, const char *path, int flags, void *data, size_t *data_len) { struct mount *mp; int error; /* If MNT_GETARGS is specified, it should be the only flag. */ if (flags & ~MNT_GETARGS) return EINVAL; mp = vp->v_mount; /* XXX: probably some notion of "can see" here if we want isolation. */ error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_GET, mp, data, NULL); if (error) return error; if ((vp->v_vflag & VV_ROOT) == 0) return EINVAL; if (vfs_busy(mp, NULL)) return EPERM; mutex_enter(&mp->mnt_updating); mp->mnt_flag &= ~MNT_OP_FLAGS; mp->mnt_flag |= MNT_GETARGS; error = VFS_MOUNT(mp, path, data, data_len); mp->mnt_flag &= ~MNT_OP_FLAGS; mutex_exit(&mp->mnt_updating); vfs_unbusy(mp, false, NULL); return (error); } int sys___mount50(struct lwp *l, const struct sys___mount50_args *uap, register_t *retval) { /* { syscallarg(const char *) type; syscallarg(const char *) path; syscallarg(int) flags; syscallarg(void *) data; syscallarg(size_t) data_len; } */ return do_sys_mount(l, NULL, SCARG(uap, type), SCARG(uap, path), SCARG(uap, flags), SCARG(uap, data), UIO_USERSPACE, SCARG(uap, data_len), retval); } int do_sys_mount(struct lwp *l, struct vfsops *vfsops, const char *type, const char *path, int flags, void *data, enum uio_seg data_seg, size_t data_len, register_t *retval) { struct vnode *vp; struct nameidata nd; void *data_buf = data; u_int recurse; int error; /* * Get vnode to be covered */ NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, path); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; /* * A lookup in VFS_MOUNT might result in an attempt to * lock this vnode again, so make the lock recursive. */ if (vfsops == NULL) { if (flags & (MNT_GETARGS | MNT_UPDATE)) { vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); recurse = vn_setrecurse(vp); vfsops = vp->v_mount->mnt_op; } else { /* 'type' is userspace */ error = mount_get_vfsops(type, &vfsops); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); recurse = vn_setrecurse(vp); if (error != 0) goto done; } } else { vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); recurse = vn_setrecurse(vp); } if (data != NULL && data_seg == UIO_USERSPACE) { if (data_len == 0) { /* No length supplied, use default for filesystem */ data_len = vfsops->vfs_min_mount_data; if (data_len > VFS_MAX_MOUNT_DATA) { error = EINVAL; goto done; } /* * Hopefully a longer buffer won't make copyin() fail. * For compatibility with 3.0 and earlier. */ if (flags & MNT_UPDATE && data_len < sizeof (struct mnt_export_args30)) data_len = sizeof (struct mnt_export_args30); } data_buf = kmem_alloc(data_len, KM_SLEEP); /* NFS needs the buffer even for mnt_getargs .... */ error = copyin(data, data_buf, data_len); if (error != 0) goto done; } if (flags & MNT_GETARGS) { if (data_len == 0) { error = EINVAL; goto done; } error = mount_getargs(l, vp, path, flags, data_buf, &data_len); if (error != 0) goto done; if (data_seg == UIO_USERSPACE) error = copyout(data_buf, data, data_len); *retval = data_len; } else if (flags & MNT_UPDATE) { error = mount_update(l, vp, path, flags, data_buf, &data_len); } else { /* Locking is handled internally in mount_domount(). */ error = mount_domount(l, &vp, vfsops, path, flags, data_buf, &data_len, recurse); } done: if (vp != NULL) { vn_restorerecurse(vp, recurse); vput(vp); } if (data_buf != data) kmem_free(data_buf, data_len); return (error); } /* * Scan all active processes to see if any of them have a current * or root directory onto which the new filesystem has just been * mounted. If so, replace them with the new mount point. */ void checkdirs(struct vnode *olddp) { struct cwdinfo *cwdi; struct vnode *newdp, *rele1, *rele2; struct proc *p; bool retry; if (olddp->v_usecount == 1) return; if (VFS_ROOT(olddp->v_mountedhere, &newdp)) panic("mount: lost mount"); do { retry = false; mutex_enter(proc_lock); PROCLIST_FOREACH(p, &allproc) { if ((p->p_flag & PK_MARKER) != 0) continue; if ((cwdi = p->p_cwdi) == NULL) continue; /* * Can't change to the old directory any more, * so even if we see a stale value it's not a * problem. */ if (cwdi->cwdi_cdir != olddp && cwdi->cwdi_rdir != olddp) continue; retry = true; rele1 = NULL; rele2 = NULL; atomic_inc_uint(&cwdi->cwdi_refcnt); mutex_exit(proc_lock); rw_enter(&cwdi->cwdi_lock, RW_WRITER); if (cwdi->cwdi_cdir == olddp) { rele1 = cwdi->cwdi_cdir; VREF(newdp); cwdi->cwdi_cdir = newdp; } if (cwdi->cwdi_rdir == olddp) { rele2 = cwdi->cwdi_rdir; VREF(newdp); cwdi->cwdi_rdir = newdp; } rw_exit(&cwdi->cwdi_lock); cwdfree(cwdi); if (rele1 != NULL) vrele(rele1); if (rele2 != NULL) vrele(rele2); mutex_enter(proc_lock); break; } mutex_exit(proc_lock); } while (retry); if (rootvnode == olddp) { vrele(rootvnode); VREF(newdp); rootvnode = newdp; } vput(newdp); } /* * Unmount a file system. * * Note: unmount takes a path to the vnode mounted on as argument, * not special file (as before). */ /* ARGSUSED */ int sys_unmount(struct lwp *l, const struct sys_unmount_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) flags; } */ struct vnode *vp; struct mount *mp; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; mp = vp->v_mount; atomic_inc_uint(&mp->mnt_refcnt); VOP_UNLOCK(vp, 0); error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_UNMOUNT, mp, NULL, NULL); if (error) { vrele(vp); vfs_destroy(mp); return (error); } /* * Don't allow unmounting the root file system. */ if (mp->mnt_flag & MNT_ROOTFS) { vrele(vp); vfs_destroy(mp); return (EINVAL); } /* * Must be the root of the filesystem */ if ((vp->v_vflag & VV_ROOT) == 0) { vrele(vp); vfs_destroy(mp); return (EINVAL); } vrele(vp); error = dounmount(mp, SCARG(uap, flags), l); vfs_destroy(mp); return error; } /* * Do the actual file system unmount. File system is assumed to have * been locked by the caller. * * => Caller hold reference to the mount, explicitly for dounmount(). */ int dounmount(struct mount *mp, int flags, struct lwp *l) { struct vnode *coveredvp; int error; int async; int used_syncer; #if NVERIEXEC > 0 error = veriexec_unmountchk(mp); if (error) return (error); #endif /* NVERIEXEC > 0 */ /* * XXX Freeze syncer. Must do this before locking the * mount point. See dounmount() for details. */ mutex_enter(&syncer_mutex); rw_enter(&mp->mnt_unmounting, RW_WRITER); if ((mp->mnt_iflag & IMNT_GONE) != 0) { rw_exit(&mp->mnt_unmounting); mutex_exit(&syncer_mutex); return ENOENT; } used_syncer = (mp->mnt_syncer != NULL); /* * XXX Syncer must be frozen when we get here. This should really * be done on a per-mountpoint basis, but especially the softdep * code possibly called from the syncer doesn't exactly work on a * per-mountpoint basis, so the softdep code would become a maze * of vfs_busy() calls. * * The caller of dounmount() must acquire syncer_mutex because * the syncer itself acquires locks in syncer_mutex -> vfs_busy * order, and we must preserve that order to avoid deadlock. * * So, if the file system did not use the syncer, now is * the time to release the syncer_mutex. */ if (used_syncer == 0) mutex_exit(&syncer_mutex); mp->mnt_iflag |= IMNT_UNMOUNT; async = mp->mnt_flag & MNT_ASYNC; mp->mnt_flag &= ~MNT_ASYNC; cache_purgevfs(mp); /* remove cache entries for this file sys */ if (mp->mnt_syncer != NULL) vfs_deallocate_syncvnode(mp); error = 0; if ((mp->mnt_flag & MNT_RDONLY) == 0) { error = VFS_SYNC(mp, MNT_WAIT, l->l_cred); } vfs_scrubvnlist(mp); if (error == 0 || (flags & MNT_FORCE)) error = VFS_UNMOUNT(mp, flags); if (error) { if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) (void) vfs_allocate_syncvnode(mp); mp->mnt_iflag &= ~IMNT_UNMOUNT; mp->mnt_flag |= async; rw_exit(&mp->mnt_unmounting); if (used_syncer) mutex_exit(&syncer_mutex); return (error); } vfs_scrubvnlist(mp); mutex_enter(&mountlist_lock); if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) coveredvp->v_mountedhere = NULL; CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); mp->mnt_iflag |= IMNT_GONE; mutex_exit(&mountlist_lock); if (TAILQ_FIRST(&mp->mnt_vnodelist) != NULL) panic("unmount: dangling vnode"); if (used_syncer) mutex_exit(&syncer_mutex); vfs_hooks_unmount(mp); rw_exit(&mp->mnt_unmounting); vfs_destroy(mp); /* reference from mount() */ if (coveredvp != NULLVP) vrele(coveredvp); return (0); } /* * Sync each mounted filesystem. */ #ifdef DEBUG int syncprt = 0; struct ctldebug debug0 = { "syncprt", &syncprt }; #endif /* ARGSUSED */ int sys_sync(struct lwp *l, const void *v, register_t *retval) { struct mount *mp, *nmp; int asyncflag; if (l == NULL) l = &lwp0; mutex_enter(&mountlist_lock); for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; mp = nmp) { if (vfs_busy(mp, &nmp)) { continue; } mutex_enter(&mp->mnt_updating); if ((mp->mnt_flag & MNT_RDONLY) == 0) { asyncflag = mp->mnt_flag & MNT_ASYNC; mp->mnt_flag &= ~MNT_ASYNC; VFS_SYNC(mp, MNT_NOWAIT, l->l_cred); if (asyncflag) mp->mnt_flag |= MNT_ASYNC; } mutex_exit(&mp->mnt_updating); vfs_unbusy(mp, false, &nmp); } mutex_exit(&mountlist_lock); #ifdef DEBUG if (syncprt) vfs_bufstats(); #endif /* DEBUG */ return (0); } /* * Change filesystem quotas. */ /* ARGSUSED */ int sys_quotactl(struct lwp *l, const struct sys_quotactl_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) cmd; syscallarg(int) uid; syscallarg(void *) arg; } */ struct mount *mp; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); mp = nd.ni_vp->v_mount; error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), SCARG(uap, arg)); vrele(nd.ni_vp); return (error); } int dostatvfs(struct mount *mp, struct statvfs *sp, struct lwp *l, int flags, int root) { struct cwdinfo *cwdi = l->l_proc->p_cwdi; int error = 0; /* * If MNT_NOWAIT or MNT_LAZY is specified, do not * refresh the fsstat cache. MNT_WAIT or MNT_LAZY * overrides MNT_NOWAIT. */ if (flags == MNT_NOWAIT || flags == MNT_LAZY || (flags != MNT_WAIT && flags != 0)) { memcpy(sp, &mp->mnt_stat, sizeof(*sp)); goto done; } /* Get the filesystem stats now */ memset(sp, 0, sizeof(*sp)); if ((error = VFS_STATVFS(mp, sp)) != 0) { return error; } if (cwdi->cwdi_rdir == NULL) (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); done: if (cwdi->cwdi_rdir != NULL) { size_t len; char *bp; char c; char *path = PNBUF_GET(); bp = path + MAXPATHLEN; *--bp = '\0'; rw_enter(&cwdi->cwdi_lock, RW_READER); error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, MAXPATHLEN / 2, 0, l); rw_exit(&cwdi->cwdi_lock); if (error) { PNBUF_PUT(path); return error; } len = strlen(bp); if (len != 1) { /* * for mount points that are below our root, we can see * them, so we fix up the pathname and return them. The * rest we cannot see, so we don't allow viewing the * data. */ if (strncmp(bp, sp->f_mntonname, len) == 0 && ((c = sp->f_mntonname[len]) == '/' || c == '\0')) { (void)strlcpy(sp->f_mntonname, c == '\0' ? "/" : &sp->f_mntonname[len], sizeof(sp->f_mntonname)); } else { if (root) (void)strlcpy(sp->f_mntonname, "/", sizeof(sp->f_mntonname)); else error = EPERM; } } PNBUF_PUT(path); } sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; return error; } /* * Get filesystem statistics by path. */ int do_sys_pstatvfs(struct lwp *l, const char *path, int flags, struct statvfs *sb) { struct mount *mp; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, path); if ((error = namei(&nd)) != 0) return error; mp = nd.ni_vp->v_mount; error = dostatvfs(mp, sb, l, flags, 1); vrele(nd.ni_vp); return error; } /* ARGSUSED */ int sys_statvfs1(struct lwp *l, const struct sys_statvfs1_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(struct statvfs *) buf; syscallarg(int) flags; } */ struct statvfs *sb; int error; sb = STATVFSBUF_GET(); error = do_sys_pstatvfs(l, SCARG(uap, path), SCARG(uap, flags), sb); if (error == 0) error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); STATVFSBUF_PUT(sb); return error; } /* * Get filesystem statistics by fd. */ int do_sys_fstatvfs(struct lwp *l, int fd, int flags, struct statvfs *sb) { file_t *fp; struct mount *mp; int error; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(fd, &fp)) != 0) return (error); mp = ((struct vnode *)fp->f_data)->v_mount; error = dostatvfs(mp, sb, curlwp, flags, 1); fd_putfile(fd); return error; } /* ARGSUSED */ int sys_fstatvfs1(struct lwp *l, const struct sys_fstatvfs1_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(struct statvfs *) buf; syscallarg(int) flags; } */ struct statvfs *sb; int error; sb = STATVFSBUF_GET(); error = do_sys_fstatvfs(l, SCARG(uap, fd), SCARG(uap, flags), sb); if (error == 0) error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); STATVFSBUF_PUT(sb); return error; } /* * Get statistics on all filesystems. */ int do_sys_getvfsstat(struct lwp *l, void *sfsp, size_t bufsize, int flags, int (*copyfn)(const void *, void *, size_t), size_t entry_sz, register_t *retval) { int root = 0; struct proc *p = l->l_proc; struct mount *mp, *nmp; struct statvfs *sb; size_t count, maxcount; int error = 0; sb = STATVFSBUF_GET(); maxcount = bufsize / entry_sz; mutex_enter(&mountlist_lock); count = 0; for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; mp = nmp) { if (vfs_busy(mp, &nmp)) { continue; } if (sfsp && count < maxcount) { error = dostatvfs(mp, sb, l, flags, 0); if (error) { vfs_unbusy(mp, false, &nmp); error = 0; continue; } error = copyfn(sb, sfsp, entry_sz); if (error) { vfs_unbusy(mp, false, NULL); goto out; } sfsp = (char *)sfsp + entry_sz; root |= strcmp(sb->f_mntonname, "/") == 0; } count++; vfs_unbusy(mp, false, &nmp); } mutex_exit(&mountlist_lock); if (root == 0 && p->p_cwdi->cwdi_rdir) { /* * fake a root entry */ error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, sb, l, flags, 1); if (error != 0) goto out; if (sfsp) { error = copyfn(sb, sfsp, entry_sz); if (error != 0) goto out; } count++; } if (sfsp && count > maxcount) *retval = maxcount; else *retval = count; out: STATVFSBUF_PUT(sb); return error; } int sys_getvfsstat(struct lwp *l, const struct sys_getvfsstat_args *uap, register_t *retval) { /* { syscallarg(struct statvfs *) buf; syscallarg(size_t) bufsize; syscallarg(int) flags; } */ return do_sys_getvfsstat(l, SCARG(uap, buf), SCARG(uap, bufsize), SCARG(uap, flags), copyout, sizeof (struct statvfs), retval); } /* * Change current working directory to a given file descriptor. */ /* ARGSUSED */ int sys_fchdir(struct lwp *l, const struct sys_fchdir_args *uap, register_t *retval) { /* { syscallarg(int) fd; } */ struct proc *p = l->l_proc; struct cwdinfo *cwdi; struct vnode *vp, *tdp; struct mount *mp; file_t *fp; int error, fd; /* fd_getvnode() will use the descriptor for us */ fd = SCARG(uap, fd); if ((error = fd_getvnode(fd, &fp)) != 0) return (error); vp = fp->f_data; VREF(vp); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if (vp->v_type != VDIR) error = ENOTDIR; else error = VOP_ACCESS(vp, VEXEC, l->l_cred); if (error) { vput(vp); goto out; } while ((mp = vp->v_mountedhere) != NULL) { error = vfs_busy(mp, NULL); vput(vp); if (error != 0) goto out; error = VFS_ROOT(mp, &tdp); vfs_unbusy(mp, false, NULL); if (error) goto out; vp = tdp; } VOP_UNLOCK(vp, 0); /* * Disallow changing to a directory not under the process's * current root directory (if there is one). */ cwdi = p->p_cwdi; rw_enter(&cwdi->cwdi_lock, RW_WRITER); if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, l)) { vrele(vp); error = EPERM; /* operation not permitted */ } else { vrele(cwdi->cwdi_cdir); cwdi->cwdi_cdir = vp; } rw_exit(&cwdi->cwdi_lock); out: fd_putfile(fd); return (error); } /* * Change this process's notion of the root directory to a given file * descriptor. */ int sys_fchroot(struct lwp *l, const struct sys_fchroot_args *uap, register_t *retval) { struct proc *p = l->l_proc; struct cwdinfo *cwdi; struct vnode *vp; file_t *fp; int error, fd = SCARG(uap, fd); if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, KAUTH_REQ_SYSTEM_CHROOT_FCHROOT, NULL, NULL, NULL)) != 0) return error; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) return error; vp = fp->f_data; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if (vp->v_type != VDIR) error = ENOTDIR; else error = VOP_ACCESS(vp, VEXEC, l->l_cred); VOP_UNLOCK(vp, 0); if (error) goto out; VREF(vp); /* * Prevent escaping from chroot by putting the root under * the working directory. Silently chdir to / if we aren't * already there. */ cwdi = p->p_cwdi; rw_enter(&cwdi->cwdi_lock, RW_WRITER); if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { /* * XXX would be more failsafe to change directory to a * deadfs node here instead */ vrele(cwdi->cwdi_cdir); VREF(vp); cwdi->cwdi_cdir = vp; } if (cwdi->cwdi_rdir != NULL) vrele(cwdi->cwdi_rdir); cwdi->cwdi_rdir = vp; rw_exit(&cwdi->cwdi_lock); out: fd_putfile(fd); return (error); } /* * Change current working directory (``.''). */ /* ARGSUSED */ int sys_chdir(struct lwp *l, const struct sys_chdir_args *uap, register_t *retval) { /* { syscallarg(const char *) path; } */ struct proc *p = l->l_proc; struct cwdinfo *cwdi; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = change_dir(&nd, l)) != 0) return (error); cwdi = p->p_cwdi; rw_enter(&cwdi->cwdi_lock, RW_WRITER); vrele(cwdi->cwdi_cdir); cwdi->cwdi_cdir = nd.ni_vp; rw_exit(&cwdi->cwdi_lock); return (0); } /* * Change notion of root (``/'') directory. */ /* ARGSUSED */ int sys_chroot(struct lwp *l, const struct sys_chroot_args *uap, register_t *retval) { /* { syscallarg(const char *) path; } */ struct proc *p = l->l_proc; struct cwdinfo *cwdi; struct vnode *vp; int error; struct nameidata nd; if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, KAUTH_REQ_SYSTEM_CHROOT_CHROOT, NULL, NULL, NULL)) != 0) return (error); NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = change_dir(&nd, l)) != 0) return (error); cwdi = p->p_cwdi; rw_enter(&cwdi->cwdi_lock, RW_WRITER); if (cwdi->cwdi_rdir != NULL) vrele(cwdi->cwdi_rdir); vp = nd.ni_vp; cwdi->cwdi_rdir = vp; /* * Prevent escaping from chroot by putting the root under * the working directory. Silently chdir to / if we aren't * already there. */ if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { /* * XXX would be more failsafe to change directory to a * deadfs node here instead */ vrele(cwdi->cwdi_cdir); VREF(vp); cwdi->cwdi_cdir = vp; } rw_exit(&cwdi->cwdi_lock); return (0); } /* * Common routine for chroot and chdir. */ static int change_dir(struct nameidata *ndp, struct lwp *l) { struct vnode *vp; int error; if ((error = namei(ndp)) != 0) return (error); vp = ndp->ni_vp; if (vp->v_type != VDIR) error = ENOTDIR; else error = VOP_ACCESS(vp, VEXEC, l->l_cred); if (error) vput(vp); else VOP_UNLOCK(vp, 0); return (error); } /* * Check permissions, allocate an open file structure, * and call the device open routine if any. */ int sys_open(struct lwp *l, const struct sys_open_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) flags; syscallarg(int) mode; } */ struct proc *p = l->l_proc; struct cwdinfo *cwdi = p->p_cwdi; file_t *fp; struct vnode *vp; int flags, cmode; int type, indx, error; struct flock lf; struct nameidata nd; flags = FFLAGS(SCARG(uap, flags)); if ((flags & (FREAD | FWRITE)) == 0) return (EINVAL); if ((error = fd_allocfile(&fp, &indx)) != 0) return (error); /* We're going to read cwdi->cwdi_cmask unlocked here. */ cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); l->l_dupfd = -indx - 1; /* XXX check for fdopen */ if ((error = vn_open(&nd, flags, cmode)) != 0) { fd_abort(p, fp, indx); if ((error == EDUPFD || error == EMOVEFD) && l->l_dupfd >= 0 && /* XXX from fdopen */ (error = fd_dupopen(l->l_dupfd, &indx, flags, error)) == 0) { *retval = indx; return (0); } if (error == ERESTART) error = EINTR; return (error); } l->l_dupfd = 0; vp = nd.ni_vp; fp->f_flag = flags & FMASK; fp->f_type = DTYPE_VNODE; fp->f_ops = &vnops; fp->f_data = vp; if (flags & (O_EXLOCK | O_SHLOCK)) { lf.l_whence = SEEK_SET; lf.l_start = 0; lf.l_len = 0; if (flags & O_EXLOCK) lf.l_type = F_WRLCK; else lf.l_type = F_RDLCK; type = F_FLOCK; if ((flags & FNONBLOCK) == 0) type |= F_WAIT; VOP_UNLOCK(vp, 0); error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); if (error) { (void) vn_close(vp, fp->f_flag, fp->f_cred); fd_abort(p, fp, indx); return (error); } vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); atomic_or_uint(&fp->f_flag, FHASLOCK); } VOP_UNLOCK(vp, 0); *retval = indx; fd_affix(p, fp, indx); return (0); } static void vfs__fhfree(fhandle_t *fhp) { size_t fhsize; if (fhp == NULL) { return; } fhsize = FHANDLE_SIZE(fhp); kmem_free(fhp, fhsize); } /* * vfs_composefh: compose a filehandle. */ int vfs_composefh(struct vnode *vp, fhandle_t *fhp, size_t *fh_size) { struct mount *mp; struct fid *fidp; int error; size_t needfhsize; size_t fidsize; mp = vp->v_mount; fidp = NULL; if (*fh_size < FHANDLE_SIZE_MIN) { fidsize = 0; } else { fidsize = *fh_size - offsetof(fhandle_t, fh_fid); if (fhp != NULL) { memset(fhp, 0, *fh_size); fhp->fh_fsid = mp->mnt_stat.f_fsidx; fidp = &fhp->fh_fid; } } error = VFS_VPTOFH(vp, fidp, &fidsize); needfhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); if (error == 0 && *fh_size < needfhsize) { error = E2BIG; } *fh_size = needfhsize; return error; } int vfs_composefh_alloc(struct vnode *vp, fhandle_t **fhpp) { struct mount *mp; fhandle_t *fhp; size_t fhsize; size_t fidsize; int error; *fhpp = NULL; mp = vp->v_mount; fidsize = 0; error = VFS_VPTOFH(vp, NULL, &fidsize); KASSERT(error != 0); if (error != E2BIG) { goto out; } fhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); fhp = kmem_zalloc(fhsize, KM_SLEEP); if (fhp == NULL) { error = ENOMEM; goto out; } fhp->fh_fsid = mp->mnt_stat.f_fsidx; error = VFS_VPTOFH(vp, &fhp->fh_fid, &fidsize); if (error == 0) { KASSERT((FHANDLE_SIZE(fhp) == fhsize && FHANDLE_FILEID(fhp)->fid_len == fidsize)); *fhpp = fhp; } else { kmem_free(fhp, fhsize); } out: return error; } void vfs_composefh_free(fhandle_t *fhp) { vfs__fhfree(fhp); } /* * vfs_fhtovp: lookup a vnode by a filehandle. */ int vfs_fhtovp(fhandle_t *fhp, struct vnode **vpp) { struct mount *mp; int error; *vpp = NULL; mp = vfs_getvfs(FHANDLE_FSID(fhp)); if (mp == NULL) { error = ESTALE; goto out; } if (mp->mnt_op->vfs_fhtovp == NULL) { error = EOPNOTSUPP; goto out; } error = VFS_FHTOVP(mp, FHANDLE_FILEID(fhp), vpp); out: return error; } /* * vfs_copyinfh_alloc: allocate and copyin a filehandle, given * the needed size. */ int vfs_copyinfh_alloc(const void *ufhp, size_t fhsize, fhandle_t **fhpp) { fhandle_t *fhp; int error; *fhpp = NULL; if (fhsize > FHANDLE_SIZE_MAX) { return EINVAL; } if (fhsize < FHANDLE_SIZE_MIN) { return EINVAL; } again: fhp = kmem_alloc(fhsize, KM_SLEEP); if (fhp == NULL) { return ENOMEM; } error = copyin(ufhp, fhp, fhsize); if (error == 0) { /* XXX this check shouldn't be here */ if (FHANDLE_SIZE(fhp) == fhsize) { *fhpp = fhp; return 0; } else if (fhsize == NFSX_V2FH && FHANDLE_SIZE(fhp) < fhsize) { /* * a kludge for nfsv2 padded handles. */ size_t sz; sz = FHANDLE_SIZE(fhp); kmem_free(fhp, fhsize); fhsize = sz; goto again; } else { /* * userland told us wrong size. */ error = EINVAL; } } kmem_free(fhp, fhsize); return error; } void vfs_copyinfh_free(fhandle_t *fhp) { vfs__fhfree(fhp); } /* * Get file handle system call */ int sys___getfh30(struct lwp *l, const struct sys___getfh30_args *uap, register_t *retval) { /* { syscallarg(char *) fname; syscallarg(fhandle_t *) fhp; syscallarg(size_t *) fh_size; } */ struct vnode *vp; fhandle_t *fh; int error; struct nameidata nd; size_t sz; size_t usz; /* * Must be super user */ error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL); if (error) return (error); NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, fname)); error = namei(&nd); if (error) return (error); vp = nd.ni_vp; error = vfs_composefh_alloc(vp, &fh); vput(vp); if (error != 0) { goto out; } error = copyin(SCARG(uap, fh_size), &usz, sizeof(size_t)); if (error != 0) { goto out; } sz = FHANDLE_SIZE(fh); error = copyout(&sz, SCARG(uap, fh_size), sizeof(size_t)); if (error != 0) { goto out; } if (usz >= sz) { error = copyout(fh, SCARG(uap, fhp), sz); } else { error = E2BIG; } out: vfs_composefh_free(fh); return (error); } /* * Open a file given a file handle. * * Check permissions, allocate an open file structure, * and call the device open routine if any. */ int dofhopen(struct lwp *l, const void *ufhp, size_t fhsize, int oflags, register_t *retval) { file_t *fp; struct vnode *vp = NULL; kauth_cred_t cred = l->l_cred; file_t *nfp; int type, indx, error=0; struct flock lf; struct vattr va; fhandle_t *fh; int flags; proc_t *p; p = curproc; /* * Must be super user */ if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL))) return (error); flags = FFLAGS(oflags); if ((flags & (FREAD | FWRITE)) == 0) return (EINVAL); if ((flags & O_CREAT)) return (EINVAL); if ((error = fd_allocfile(&nfp, &indx)) != 0) return (error); fp = nfp; error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); if (error != 0) { goto bad; } error = vfs_fhtovp(fh, &vp); if (error != 0) { goto bad; } /* Now do an effective vn_open */ if (vp->v_type == VSOCK) { error = EOPNOTSUPP; goto bad; } error = vn_openchk(vp, cred, flags); if (error != 0) goto bad; if (flags & O_TRUNC) { VOP_UNLOCK(vp, 0); /* XXX */ vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ VATTR_NULL(&va); va.va_size = 0; error = VOP_SETATTR(vp, &va, cred); if (error) goto bad; } if ((error = VOP_OPEN(vp, flags, cred)) != 0) goto bad; if (flags & FWRITE) { mutex_enter(&vp->v_interlock); vp->v_writecount++; mutex_exit(&vp->v_interlock); } /* done with modified vn_open, now finish what sys_open does. */ fp->f_flag = flags & FMASK; fp->f_type = DTYPE_VNODE; fp->f_ops = &vnops; fp->f_data = vp; if (flags & (O_EXLOCK | O_SHLOCK)) { lf.l_whence = SEEK_SET; lf.l_start = 0; lf.l_len = 0; if (flags & O_EXLOCK) lf.l_type = F_WRLCK; else lf.l_type = F_RDLCK; type = F_FLOCK; if ((flags & FNONBLOCK) == 0) type |= F_WAIT; VOP_UNLOCK(vp, 0); error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); if (error) { (void) vn_close(vp, fp->f_flag, fp->f_cred); fd_abort(p, fp, indx); return (error); } vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); atomic_or_uint(&fp->f_flag, FHASLOCK); } VOP_UNLOCK(vp, 0); *retval = indx; fd_affix(p, fp, indx); vfs_copyinfh_free(fh); return (0); bad: fd_abort(p, fp, indx); if (vp != NULL) vput(vp); vfs_copyinfh_free(fh); return (error); } int sys___fhopen40(struct lwp *l, const struct sys___fhopen40_args *uap, register_t *retval) { /* { syscallarg(const void *) fhp; syscallarg(size_t) fh_size; syscallarg(int) flags; } */ return dofhopen(l, SCARG(uap, fhp), SCARG(uap, fh_size), SCARG(uap, flags), retval); } int do_fhstat(struct lwp *l, const void *ufhp, size_t fhsize, struct stat *sb) { int error; fhandle_t *fh; struct vnode *vp; /* * Must be super user */ if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL))) return (error); error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); if (error != 0) return error; error = vfs_fhtovp(fh, &vp); vfs_copyinfh_free(fh); if (error != 0) return error; error = vn_stat(vp, sb); vput(vp); return error; } /* ARGSUSED */ int sys___fhstat50(struct lwp *l, const struct sys___fhstat50_args *uap, register_t *retval) { /* { syscallarg(const void *) fhp; syscallarg(size_t) fh_size; syscallarg(struct stat *) sb; } */ struct stat sb; int error; error = do_fhstat(l, SCARG(uap, fhp), SCARG(uap, fh_size), &sb); if (error) return error; return copyout(&sb, SCARG(uap, sb), sizeof(sb)); } int do_fhstatvfs(struct lwp *l, const void *ufhp, size_t fhsize, struct statvfs *sb, int flags) { fhandle_t *fh; struct mount *mp; struct vnode *vp; int error; /* * Must be super user */ if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL))) return error; error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); if (error != 0) return error; error = vfs_fhtovp(fh, &vp); vfs_copyinfh_free(fh); if (error != 0) return error; mp = vp->v_mount; error = dostatvfs(mp, sb, l, flags, 1); vput(vp); return error; } /* ARGSUSED */ int sys___fhstatvfs140(struct lwp *l, const struct sys___fhstatvfs140_args *uap, register_t *retval) { /* { syscallarg(const void *) fhp; syscallarg(size_t) fh_size; syscallarg(struct statvfs *) buf; syscallarg(int) flags; } */ struct statvfs *sb = STATVFSBUF_GET(); int error; error = do_fhstatvfs(l, SCARG(uap, fhp), SCARG(uap, fh_size), sb, SCARG(uap, flags)); if (error == 0) error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); STATVFSBUF_PUT(sb); return error; } /* * Create a special file. */ /* ARGSUSED */ int sys___mknod50(struct lwp *l, const struct sys___mknod50_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(mode_t) mode; syscallarg(dev_t) dev; } */ return do_sys_mknod(l, SCARG(uap, path), SCARG(uap, mode), SCARG(uap, dev), retval); } int do_sys_mknod(struct lwp *l, const char *pathname, mode_t mode, dev_t dev, register_t *retval) { struct proc *p = l->l_proc; struct vnode *vp; struct vattr vattr; int error, optype; struct nameidata nd; char *path; const char *cpath; enum uio_seg seg = UIO_USERSPACE; if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MKNOD, 0, NULL, NULL, NULL)) != 0) return (error); optype = VOP_MKNOD_DESCOFFSET; VERIEXEC_PATH_GET(pathname, seg, cpath, path); NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, seg, cpath); if ((error = namei(&nd)) != 0) goto out; vp = nd.ni_vp; if (vp != NULL) error = EEXIST; else { VATTR_NULL(&vattr); /* We will read cwdi->cwdi_cmask unlocked. */ vattr.va_mode = (mode & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; vattr.va_rdev = dev; switch (mode & S_IFMT) { case S_IFMT: /* used by badsect to flag bad sectors */ vattr.va_type = VBAD; break; case S_IFCHR: vattr.va_type = VCHR; break; case S_IFBLK: vattr.va_type = VBLK; break; case S_IFWHT: optype = VOP_WHITEOUT_DESCOFFSET; break; case S_IFREG: #if NVERIEXEC > 0 error = veriexec_openchk(l, nd.ni_vp, nd.ni_dirp, O_CREAT); #endif /* NVERIEXEC > 0 */ vattr.va_type = VREG; vattr.va_rdev = VNOVAL; optype = VOP_CREATE_DESCOFFSET; break; default: error = EINVAL; break; } } if (!error) { switch (optype) { case VOP_WHITEOUT_DESCOFFSET: error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); if (error) VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); vput(nd.ni_dvp); break; case VOP_MKNOD_DESCOFFSET: error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); if (error == 0) vput(nd.ni_vp); break; case VOP_CREATE_DESCOFFSET: error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); if (error == 0) vput(nd.ni_vp); break; } } else { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); if (vp) vrele(vp); } out: VERIEXEC_PATH_PUT(path); return (error); } /* * Create a named pipe. */ /* ARGSUSED */ int sys_mkfifo(struct lwp *l, const struct sys_mkfifo_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) mode; } */ struct proc *p = l->l_proc; struct vattr vattr; int error; struct nameidata nd; NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); if (nd.ni_vp != NULL) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(nd.ni_vp); return (EEXIST); } VATTR_NULL(&vattr); vattr.va_type = VFIFO; /* We will read cwdi->cwdi_cmask unlocked. */ vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); if (error == 0) vput(nd.ni_vp); return (error); } /* * Make a hard file link. */ /* ARGSUSED */ int sys_link(struct lwp *l, const struct sys_link_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(const char *) link; } */ struct vnode *vp; struct nameidata nd; int error; NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, link)); if ((error = namei(&nd)) != 0) goto out; if (nd.ni_vp) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(nd.ni_vp); error = EEXIST; goto out; } error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); out: vrele(vp); return (error); } /* * Make a symbolic link. */ /* ARGSUSED */ int sys_symlink(struct lwp *l, const struct sys_symlink_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(const char *) link; } */ struct proc *p = l->l_proc; struct vattr vattr; char *path; int error; struct nameidata nd; path = PNBUF_GET(); error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); if (error) goto out; NDINIT(&nd, CREATE, LOCKPARENT | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, link)); if ((error = namei(&nd)) != 0) goto out; if (nd.ni_vp) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(nd.ni_vp); error = EEXIST; goto out; } VATTR_NULL(&vattr); vattr.va_type = VLNK; /* We will read cwdi->cwdi_cmask unlocked. */ vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); if (error == 0) vput(nd.ni_vp); out: PNBUF_PUT(path); return (error); } /* * Delete a whiteout from the filesystem. */ /* ARGSUSED */ int sys_undelete(struct lwp *l, const struct sys_undelete_args *uap, register_t *retval) { /* { syscallarg(const char *) path; } */ int error; struct nameidata nd; NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); error = namei(&nd); if (error) return (error); if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); if (nd.ni_vp) vrele(nd.ni_vp); return (EEXIST); } if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); vput(nd.ni_dvp); return (error); } /* * Delete a name from the filesystem. */ /* ARGSUSED */ int sys_unlink(struct lwp *l, const struct sys_unlink_args *uap, register_t *retval) { /* { syscallarg(const char *) path; } */ return do_sys_unlink(SCARG(uap, path), UIO_USERSPACE); } int do_sys_unlink(const char *arg, enum uio_seg seg) { struct vnode *vp; int error; struct nameidata nd; kauth_cred_t cred; char *path; const char *cpath; VERIEXEC_PATH_GET(arg, seg, cpath, path); NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, seg, cpath); if ((error = namei(&nd)) != 0) goto out; vp = nd.ni_vp; /* * The root of a mounted filesystem cannot be deleted. */ if (vp->v_vflag & VV_ROOT) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vput(vp); error = EBUSY; goto out; } #if NVERIEXEC > 0 /* Handle remove requests for veriexec entries. */ if ((error = veriexec_removechk(curlwp, nd.ni_vp, nd.ni_dirp)) != 0) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vput(vp); goto out; } #endif /* NVERIEXEC > 0 */ cred = kauth_cred_get(); #ifdef FILEASSOC (void)fileassoc_file_delete(vp); #endif /* FILEASSOC */ error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); out: VERIEXEC_PATH_PUT(path); return (error); } /* * Reposition read/write file offset. */ int sys_lseek(struct lwp *l, const struct sys_lseek_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(int) pad; syscallarg(off_t) offset; syscallarg(int) whence; } */ kauth_cred_t cred = l->l_cred; file_t *fp; struct vnode *vp; struct vattr vattr; off_t newoff; int error, fd; fd = SCARG(uap, fd); if ((fp = fd_getfile(fd)) == NULL) return (EBADF); vp = fp->f_data; if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { error = ESPIPE; goto out; } switch (SCARG(uap, whence)) { case SEEK_CUR: newoff = fp->f_offset + SCARG(uap, offset); break; case SEEK_END: error = VOP_GETATTR(vp, &vattr, cred); if (error) { goto out; } newoff = SCARG(uap, offset) + vattr.va_size; break; case SEEK_SET: newoff = SCARG(uap, offset); break; default: error = EINVAL; goto out; } if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) == 0) { *(off_t *)retval = fp->f_offset = newoff; } out: fd_putfile(fd); return (error); } /* * Positional read system call. */ int sys_pread(struct lwp *l, const struct sys_pread_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(void *) buf; syscallarg(size_t) nbyte; syscallarg(off_t) offset; } */ file_t *fp; struct vnode *vp; off_t offset; int error, fd = SCARG(uap, fd); if ((fp = fd_getfile(fd)) == NULL) return (EBADF); if ((fp->f_flag & FREAD) == 0) { fd_putfile(fd); return (EBADF); } vp = fp->f_data; if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { error = ESPIPE; goto out; } offset = SCARG(uap, offset); /* * XXX This works because no file systems actually * XXX take any action on the seek operation. */ if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) goto out; /* dofileread() will unuse the descriptor for us */ return (dofileread(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), &offset, 0, retval)); out: fd_putfile(fd); return (error); } /* * Positional scatter read system call. */ int sys_preadv(struct lwp *l, const struct sys_preadv_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(const struct iovec *) iovp; syscallarg(int) iovcnt; syscallarg(off_t) offset; } */ off_t offset = SCARG(uap, offset); return do_filereadv(SCARG(uap, fd), SCARG(uap, iovp), SCARG(uap, iovcnt), &offset, 0, retval); } /* * Positional write system call. */ int sys_pwrite(struct lwp *l, const struct sys_pwrite_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(const void *) buf; syscallarg(size_t) nbyte; syscallarg(off_t) offset; } */ file_t *fp; struct vnode *vp; off_t offset; int error, fd = SCARG(uap, fd); if ((fp = fd_getfile(fd)) == NULL) return (EBADF); if ((fp->f_flag & FWRITE) == 0) { fd_putfile(fd); return (EBADF); } vp = fp->f_data; if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { error = ESPIPE; goto out; } offset = SCARG(uap, offset); /* * XXX This works because no file systems actually * XXX take any action on the seek operation. */ if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) goto out; /* dofilewrite() will unuse the descriptor for us */ return (dofilewrite(fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), &offset, 0, retval)); out: fd_putfile(fd); return (error); } /* * Positional gather write system call. */ int sys_pwritev(struct lwp *l, const struct sys_pwritev_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(const struct iovec *) iovp; syscallarg(int) iovcnt; syscallarg(off_t) offset; } */ off_t offset = SCARG(uap, offset); return do_filewritev(SCARG(uap, fd), SCARG(uap, iovp), SCARG(uap, iovcnt), &offset, 0, retval); } /* * Check access permissions. */ int sys_access(struct lwp *l, const struct sys_access_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) flags; } */ kauth_cred_t cred; struct vnode *vp; int error, flags; struct nameidata nd; cred = kauth_cred_dup(l->l_cred); kauth_cred_seteuid(cred, kauth_cred_getuid(l->l_cred)); kauth_cred_setegid(cred, kauth_cred_getgid(l->l_cred)); NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); /* Override default credentials */ nd.ni_cnd.cn_cred = cred; if ((error = namei(&nd)) != 0) goto out; vp = nd.ni_vp; /* Flags == 0 means only check for existence. */ if (SCARG(uap, flags)) { flags = 0; if (SCARG(uap, flags) & R_OK) flags |= VREAD; if (SCARG(uap, flags) & W_OK) flags |= VWRITE; if (SCARG(uap, flags) & X_OK) flags |= VEXEC; error = VOP_ACCESS(vp, flags, cred); if (!error && (flags & VWRITE)) error = vn_writechk(vp); } vput(vp); out: kauth_cred_free(cred); return (error); } /* * Common code for all sys_stat functions, including compat versions. */ int do_sys_stat(const char *path, unsigned int nd_flags, struct stat *sb) { int error; struct nameidata nd; NDINIT(&nd, LOOKUP, nd_flags | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, path); error = namei(&nd); if (error != 0) return error; error = vn_stat(nd.ni_vp, sb); vput(nd.ni_vp); return error; } /* * Get file status; this version follows links. */ /* ARGSUSED */ int sys___stat50(struct lwp *l, const struct sys___stat50_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(struct stat *) ub; } */ struct stat sb; int error; error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb); if (error) return error; return copyout(&sb, SCARG(uap, ub), sizeof(sb)); } /* * Get file status; this version does not follow links. */ /* ARGSUSED */ int sys___lstat50(struct lwp *l, const struct sys___lstat50_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(struct stat *) ub; } */ struct stat sb; int error; error = do_sys_stat(SCARG(uap, path), NOFOLLOW, &sb); if (error) return error; return copyout(&sb, SCARG(uap, ub), sizeof(sb)); } /* * Get configurable pathname variables. */ /* ARGSUSED */ int sys_pathconf(struct lwp *l, const struct sys_pathconf_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) name; } */ int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); vput(nd.ni_vp); return (error); } /* * Return target name of a symbolic link. */ /* ARGSUSED */ int sys_readlink(struct lwp *l, const struct sys_readlink_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(char *) buf; syscallarg(size_t) count; } */ struct vnode *vp; struct iovec aiov; struct uio auio; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if (vp->v_type != VLNK) error = EINVAL; else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || (error = VOP_ACCESS(vp, VREAD, l->l_cred)) == 0) { aiov.iov_base = SCARG(uap, buf); aiov.iov_len = SCARG(uap, count); auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = 0; auio.uio_rw = UIO_READ; KASSERT(l == curlwp); auio.uio_vmspace = l->l_proc->p_vmspace; auio.uio_resid = SCARG(uap, count); error = VOP_READLINK(vp, &auio, l->l_cred); } vput(vp); *retval = SCARG(uap, count) - auio.uio_resid; return (error); } /* * Change flags of a file given a path name. */ /* ARGSUSED */ int sys_chflags(struct lwp *l, const struct sys_chflags_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(u_long) flags; } */ struct vnode *vp; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; error = change_flags(vp, SCARG(uap, flags), l); vput(vp); return (error); } /* * Change flags of a file given a file descriptor. */ /* ARGSUSED */ int sys_fchflags(struct lwp *l, const struct sys_fchflags_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(u_long) flags; } */ struct vnode *vp; file_t *fp; int error; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) return (error); vp = fp->f_data; error = change_flags(vp, SCARG(uap, flags), l); VOP_UNLOCK(vp, 0); fd_putfile(SCARG(uap, fd)); return (error); } /* * Change flags of a file given a path name; this version does * not follow links. */ int sys_lchflags(struct lwp *l, const struct sys_lchflags_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(u_long) flags; } */ struct vnode *vp; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; error = change_flags(vp, SCARG(uap, flags), l); vput(vp); return (error); } /* * Common routine to change flags of a file. */ int change_flags(struct vnode *vp, u_long flags, struct lwp *l) { struct vattr vattr; int error; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* * Non-superusers cannot change the flags on devices, even if they * own them. */ if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL)) { if ((error = VOP_GETATTR(vp, &vattr, l->l_cred)) != 0) goto out; if (vattr.va_type == VCHR || vattr.va_type == VBLK) { error = EINVAL; goto out; } } VATTR_NULL(&vattr); vattr.va_flags = flags; error = VOP_SETATTR(vp, &vattr, l->l_cred); out: return (error); } /* * Change mode of a file given path name; this version follows links. */ /* ARGSUSED */ int sys_chmod(struct lwp *l, const struct sys_chmod_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) mode; } */ int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); error = change_mode(nd.ni_vp, SCARG(uap, mode), l); vrele(nd.ni_vp); return (error); } /* * Change mode of a file given a file descriptor. */ /* ARGSUSED */ int sys_fchmod(struct lwp *l, const struct sys_fchmod_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(int) mode; } */ file_t *fp; int error; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) return (error); error = change_mode(fp->f_data, SCARG(uap, mode), l); fd_putfile(SCARG(uap, fd)); return (error); } /* * Change mode of a file given path name; this version does not follow links. */ /* ARGSUSED */ int sys_lchmod(struct lwp *l, const struct sys_lchmod_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) mode; } */ int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); error = change_mode(nd.ni_vp, SCARG(uap, mode), l); vrele(nd.ni_vp); return (error); } /* * Common routine to set mode given a vnode. */ static int change_mode(struct vnode *vp, int mode, struct lwp *l) { struct vattr vattr; int error; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); VATTR_NULL(&vattr); vattr.va_mode = mode & ALLPERMS; error = VOP_SETATTR(vp, &vattr, l->l_cred); VOP_UNLOCK(vp, 0); return (error); } /* * Set ownership given a path name; this version follows links. */ /* ARGSUSED */ int sys_chown(struct lwp *l, const struct sys_chown_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(uid_t) uid; syscallarg(gid_t) gid; } */ int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); vrele(nd.ni_vp); return (error); } /* * Set ownership given a path name; this version follows links. * Provides POSIX semantics. */ /* ARGSUSED */ int sys___posix_chown(struct lwp *l, const struct sys___posix_chown_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(uid_t) uid; syscallarg(gid_t) gid; } */ int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); vrele(nd.ni_vp); return (error); } /* * Set ownership given a file descriptor. */ /* ARGSUSED */ int sys_fchown(struct lwp *l, const struct sys_fchown_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(uid_t) uid; syscallarg(gid_t) gid; } */ int error; file_t *fp; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) return (error); error = change_owner(fp->f_data, SCARG(uap, uid), SCARG(uap, gid), l, 0); fd_putfile(SCARG(uap, fd)); return (error); } /* * Set ownership given a file descriptor, providing POSIX/XPG semantics. */ /* ARGSUSED */ int sys___posix_fchown(struct lwp *l, const struct sys___posix_fchown_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(uid_t) uid; syscallarg(gid_t) gid; } */ int error; file_t *fp; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) return (error); error = change_owner(fp->f_data, SCARG(uap, uid), SCARG(uap, gid), l, 1); fd_putfile(SCARG(uap, fd)); return (error); } /* * Set ownership given a path name; this version does not follow links. */ /* ARGSUSED */ int sys_lchown(struct lwp *l, const struct sys_lchown_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(uid_t) uid; syscallarg(gid_t) gid; } */ int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); vrele(nd.ni_vp); return (error); } /* * Set ownership given a path name; this version does not follow links. * Provides POSIX/XPG semantics. */ /* ARGSUSED */ int sys___posix_lchown(struct lwp *l, const struct sys___posix_lchown_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(uid_t) uid; syscallarg(gid_t) gid; } */ int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); vrele(nd.ni_vp); return (error); } /* * Common routine to set ownership given a vnode. */ static int change_owner(struct vnode *vp, uid_t uid, gid_t gid, struct lwp *l, int posix_semantics) { struct vattr vattr; mode_t newmode; int error; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if ((error = VOP_GETATTR(vp, &vattr, l->l_cred)) != 0) goto out; #define CHANGED(x) ((int)(x) != -1) newmode = vattr.va_mode; if (posix_semantics) { /* * POSIX/XPG semantics: if the caller is not the super-user, * clear set-user-id and set-group-id bits. Both POSIX and * the XPG consider the behaviour for calls by the super-user * implementation-defined; we leave the set-user-id and set- * group-id settings intact in that case. */ if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) newmode &= ~(S_ISUID | S_ISGID); } else { /* * NetBSD semantics: when changing owner and/or group, * clear the respective bit(s). */ if (CHANGED(uid)) newmode &= ~S_ISUID; if (CHANGED(gid)) newmode &= ~S_ISGID; } /* Update va_mode iff altered. */ if (vattr.va_mode == newmode) newmode = VNOVAL; VATTR_NULL(&vattr); vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; vattr.va_mode = newmode; error = VOP_SETATTR(vp, &vattr, l->l_cred); #undef CHANGED out: VOP_UNLOCK(vp, 0); return (error); } /* * Set the access and modification times given a path name; this * version follows links. */ /* ARGSUSED */ int sys___utimes50(struct lwp *l, const struct sys___utimes50_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(const struct timeval *) tptr; } */ return do_sys_utimes(l, NULL, SCARG(uap, path), FOLLOW, SCARG(uap, tptr), UIO_USERSPACE); } /* * Set the access and modification times given a file descriptor. */ /* ARGSUSED */ int sys___futimes50(struct lwp *l, const struct sys___futimes50_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(const struct timeval *) tptr; } */ int error; file_t *fp; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) return (error); error = do_sys_utimes(l, fp->f_data, NULL, 0, SCARG(uap, tptr), UIO_USERSPACE); fd_putfile(SCARG(uap, fd)); return (error); } /* * Set the access and modification times given a path name; this * version does not follow links. */ int sys___lutimes50(struct lwp *l, const struct sys___lutimes50_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(const struct timeval *) tptr; } */ return do_sys_utimes(l, NULL, SCARG(uap, path), NOFOLLOW, SCARG(uap, tptr), UIO_USERSPACE); } /* * Common routine to set access and modification times given a vnode. */ int do_sys_utimes(struct lwp *l, struct vnode *vp, const char *path, int flag, const struct timeval *tptr, enum uio_seg seg) { struct vattr vattr; struct nameidata nd; int error; bool vanull, setbirthtime; struct timespec ts[2]; if (tptr == NULL) { vanull = true; nanotime(&ts[0]); ts[1] = ts[0]; } else { struct timeval tv[2]; vanull = false; if (seg != UIO_SYSSPACE) { error = copyin(tptr, tv, sizeof (tv)); if (error != 0) return error; tptr = tv; } TIMEVAL_TO_TIMESPEC(&tptr[0], &ts[0]); TIMEVAL_TO_TIMESPEC(&tptr[1], &ts[1]); } if (vp == NULL) { NDINIT(&nd, LOOKUP, flag | TRYEMULROOT, UIO_USERSPACE, path); if ((error = namei(&nd)) != 0) return error; vp = nd.ni_vp; } else nd.ni_vp = NULL; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); setbirthtime = (VOP_GETATTR(vp, &vattr, l->l_cred) == 0 && timespeccmp(&ts[1], &vattr.va_birthtime, <)); VATTR_NULL(&vattr); vattr.va_atime = ts[0]; vattr.va_mtime = ts[1]; if (setbirthtime) vattr.va_birthtime = ts[1]; if (vanull) vattr.va_flags |= VA_UTIMES_NULL; error = VOP_SETATTR(vp, &vattr, l->l_cred); VOP_UNLOCK(vp, 0); if (nd.ni_vp != NULL) vrele(nd.ni_vp); return error; } /* * Truncate a file given its path name. */ /* ARGSUSED */ int sys_truncate(struct lwp *l, const struct sys_truncate_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) pad; syscallarg(off_t) length; } */ struct vnode *vp; struct vattr vattr; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if (vp->v_type == VDIR) error = EISDIR; else if ((error = vn_writechk(vp)) == 0 && (error = VOP_ACCESS(vp, VWRITE, l->l_cred)) == 0) { VATTR_NULL(&vattr); vattr.va_size = SCARG(uap, length); error = VOP_SETATTR(vp, &vattr, l->l_cred); } vput(vp); return (error); } /* * Truncate a file given a file descriptor. */ /* ARGSUSED */ int sys_ftruncate(struct lwp *l, const struct sys_ftruncate_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(int) pad; syscallarg(off_t) length; } */ struct vattr vattr; struct vnode *vp; file_t *fp; int error; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) return (error); if ((fp->f_flag & FWRITE) == 0) { error = EINVAL; goto out; } vp = fp->f_data; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if (vp->v_type == VDIR) error = EISDIR; else if ((error = vn_writechk(vp)) == 0) { VATTR_NULL(&vattr); vattr.va_size = SCARG(uap, length); error = VOP_SETATTR(vp, &vattr, fp->f_cred); } VOP_UNLOCK(vp, 0); out: fd_putfile(SCARG(uap, fd)); return (error); } /* * Sync an open file. */ /* ARGSUSED */ int sys_fsync(struct lwp *l, const struct sys_fsync_args *uap, register_t *retval) { /* { syscallarg(int) fd; } */ struct vnode *vp; file_t *fp; int error; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) return (error); vp = fp->f_data; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0); VOP_UNLOCK(vp, 0); fd_putfile(SCARG(uap, fd)); return (error); } /* * Sync a range of file data. API modeled after that found in AIX. * * FDATASYNC indicates that we need only save enough metadata to be able * to re-read the written data. Note we duplicate AIX's requirement that * the file be open for writing. */ /* ARGSUSED */ int sys_fsync_range(struct lwp *l, const struct sys_fsync_range_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(int) flags; syscallarg(off_t) start; syscallarg(off_t) length; } */ struct vnode *vp; file_t *fp; int flags, nflags; off_t s, e, len; int error; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) return (error); if ((fp->f_flag & FWRITE) == 0) { error = EBADF; goto out; } flags = SCARG(uap, flags); if (((flags & (FDATASYNC | FFILESYNC)) == 0) || ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { error = EINVAL; goto out; } /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ if (flags & FDATASYNC) nflags = FSYNC_DATAONLY | FSYNC_WAIT; else nflags = FSYNC_WAIT; if (flags & FDISKSYNC) nflags |= FSYNC_CACHE; len = SCARG(uap, length); /* If length == 0, we do the whole file, and s = l = 0 will do that */ if (len) { s = SCARG(uap, start); e = s + len; if (e < s) { error = EINVAL; goto out; } } else { e = 0; s = 0; } vp = fp->f_data; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e); VOP_UNLOCK(vp, 0); out: fd_putfile(SCARG(uap, fd)); return (error); } /* * Sync the data of an open file. */ /* ARGSUSED */ int sys_fdatasync(struct lwp *l, const struct sys_fdatasync_args *uap, register_t *retval) { /* { syscallarg(int) fd; } */ struct vnode *vp; file_t *fp; int error; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) return (error); if ((fp->f_flag & FWRITE) == 0) { fd_putfile(SCARG(uap, fd)); return (EBADF); } vp = fp->f_data; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0); VOP_UNLOCK(vp, 0); fd_putfile(SCARG(uap, fd)); return (error); } /* * Rename files, (standard) BSD semantics frontend. */ /* ARGSUSED */ int sys_rename(struct lwp *l, const struct sys_rename_args *uap, register_t *retval) { /* { syscallarg(const char *) from; syscallarg(const char *) to; } */ return (do_sys_rename(SCARG(uap, from), SCARG(uap, to), UIO_USERSPACE, 0)); } /* * Rename files, POSIX semantics frontend. */ /* ARGSUSED */ int sys___posix_rename(struct lwp *l, const struct sys___posix_rename_args *uap, register_t *retval) { /* { syscallarg(const char *) from; syscallarg(const char *) to; } */ return (do_sys_rename(SCARG(uap, from), SCARG(uap, to), UIO_USERSPACE, 1)); } /* * Rename files. Source and destination must either both be directories, * or both not be directories. If target is a directory, it must be empty. * If `from' and `to' refer to the same object, the value of the `retain' * argument is used to determine whether `from' will be * * (retain == 0) deleted unless `from' and `to' refer to the same * object in the file system's name space (BSD). * (retain == 1) always retained (POSIX). */ int do_sys_rename(const char *from, const char *to, enum uio_seg seg, int retain) { struct vnode *tvp, *fvp, *tdvp; struct nameidata fromnd, tond; struct mount *fs; struct lwp *l = curlwp; struct proc *p; uint32_t saveflag; int error; NDINIT(&fromnd, DELETE, LOCKPARENT | SAVESTART | TRYEMULROOT, seg, from); if ((error = namei(&fromnd)) != 0) return (error); if (fromnd.ni_dvp != fromnd.ni_vp) VOP_UNLOCK(fromnd.ni_dvp, 0); fvp = fromnd.ni_vp; fs = fvp->v_mount; error = VFS_RENAMELOCK_ENTER(fs); if (error) { VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); vrele(fromnd.ni_dvp); vrele(fvp); goto out1; } /* * close, partially, yet another race - ideally we should only * go as far as getting fromnd.ni_dvp before getting the per-fs * lock, and then continue to get fromnd.ni_vp, but we can't do * that with namei as it stands. * * This still won't prevent rmdir from nuking fromnd.ni_vp * under us. The real fix is to get the locks in the right * order and do the lookups in the right places, but that's a * major rototill. * * Preserve the SAVESTART in cn_flags, because who knows what * might happen if we don't. * * Note: this logic (as well as this whole function) is cloned * in nfs_serv.c. Proceed accordingly. */ vrele(fvp); if ((fromnd.ni_cnd.cn_namelen == 1 && fromnd.ni_cnd.cn_nameptr[0] == '.') || (fromnd.ni_cnd.cn_namelen == 2 && fromnd.ni_cnd.cn_nameptr[0] == '.' && fromnd.ni_cnd.cn_nameptr[1] == '.')) { error = EINVAL; VFS_RENAMELOCK_EXIT(fs); VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); vrele(fromnd.ni_dvp); goto out1; } saveflag = fromnd.ni_cnd.cn_flags & SAVESTART; fromnd.ni_cnd.cn_flags &= ~SAVESTART; vn_lock(fromnd.ni_dvp, LK_EXCLUSIVE | LK_RETRY); error = relookup(fromnd.ni_dvp, &fromnd.ni_vp, &fromnd.ni_cnd); fromnd.ni_cnd.cn_flags |= saveflag; if (error) { VOP_UNLOCK(fromnd.ni_dvp, 0); VFS_RENAMELOCK_EXIT(fs); VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); vrele(fromnd.ni_dvp); goto out1; } VOP_UNLOCK(fromnd.ni_vp, 0); if (fromnd.ni_dvp != fromnd.ni_vp) VOP_UNLOCK(fromnd.ni_dvp, 0); fvp = fromnd.ni_vp; NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | TRYEMULROOT | (fvp->v_type == VDIR ? CREATEDIR : 0), seg, to); if ((error = namei(&tond)) != 0) { VFS_RENAMELOCK_EXIT(fs); VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); vrele(fromnd.ni_dvp); vrele(fvp); goto out1; } tdvp = tond.ni_dvp; tvp = tond.ni_vp; if (tvp != NULL) { if (fvp->v_type == VDIR && tvp->v_type != VDIR) { error = ENOTDIR; goto out; } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { error = EISDIR; goto out; } } if (fvp == tdvp) error = EINVAL; /* * Source and destination refer to the same object. */ if (fvp == tvp) { if (retain) error = -1; else if (fromnd.ni_dvp == tdvp && fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && !memcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, fromnd.ni_cnd.cn_namelen)) error = -1; } #if NVERIEXEC > 0 if (!error) { char *f1, *f2; size_t f1_len; size_t f2_len; f1_len = fromnd.ni_cnd.cn_namelen + 1; f1 = kmem_alloc(f1_len, KM_SLEEP); strlcpy(f1, fromnd.ni_cnd.cn_nameptr, f1_len); f2_len = tond.ni_cnd.cn_namelen + 1; f2 = kmem_alloc(f2_len, KM_SLEEP); strlcpy(f2, tond.ni_cnd.cn_nameptr, f2_len); error = veriexec_renamechk(l, fvp, f1, tvp, f2); kmem_free(f1, f1_len); kmem_free(f2, f2_len); } #endif /* NVERIEXEC > 0 */ out: p = l->l_proc; if (!error) { error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); VFS_RENAMELOCK_EXIT(fs); } else { VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); if (tdvp == tvp) vrele(tdvp); else vput(tdvp); if (tvp) vput(tvp); VFS_RENAMELOCK_EXIT(fs); VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); vrele(fromnd.ni_dvp); vrele(fvp); } vrele(tond.ni_startdir); PNBUF_PUT(tond.ni_cnd.cn_pnbuf); out1: if (fromnd.ni_startdir) vrele(fromnd.ni_startdir); PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); return (error == -1 ? 0 : error); } /* * Make a directory file. */ /* ARGSUSED */ int sys_mkdir(struct lwp *l, const struct sys_mkdir_args *uap, register_t *retval) { /* { syscallarg(const char *) path; syscallarg(int) mode; } */ struct proc *p = l->l_proc; struct vnode *vp; struct vattr vattr; int error; struct nameidata nd; NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if (vp != NULL) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(vp); return (EEXIST); } VATTR_NULL(&vattr); vattr.va_type = VDIR; /* We will read cwdi->cwdi_cmask unlocked. */ vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); if (!error) vput(nd.ni_vp); return (error); } /* * Remove a directory file. */ /* ARGSUSED */ int sys_rmdir(struct lwp *l, const struct sys_rmdir_args *uap, register_t *retval) { /* { syscallarg(const char *) path; } */ struct vnode *vp; int error; struct nameidata nd; NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if (vp->v_type != VDIR) { error = ENOTDIR; goto out; } /* * No rmdir "." please. */ if (nd.ni_dvp == vp) { error = EINVAL; goto out; } /* * The root of a mounted filesystem cannot be deleted. */ if ((vp->v_vflag & VV_ROOT) != 0 || vp->v_mountedhere != NULL) { error = EBUSY; goto out; } error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); return (error); out: VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vput(vp); return (error); } /* * Read a block of directory entries in a file system independent format. */ int sys___getdents30(struct lwp *l, const struct sys___getdents30_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(char *) buf; syscallarg(size_t) count; } */ file_t *fp; int error, done; /* fd_getvnode() will use the descriptor for us */ if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) return (error); if ((fp->f_flag & FREAD) == 0) { error = EBADF; goto out; } error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, SCARG(uap, count), &done, l, 0, 0); ktrgenio(SCARG(uap, fd), UIO_READ, SCARG(uap, buf), done, error); *retval = done; out: fd_putfile(SCARG(uap, fd)); return (error); } /* * Set the mode mask for creation of filesystem nodes. */ int sys_umask(struct lwp *l, const struct sys_umask_args *uap, register_t *retval) { /* { syscallarg(mode_t) newmask; } */ struct proc *p = l->l_proc; struct cwdinfo *cwdi; /* * cwdi->cwdi_cmask will be read unlocked elsewhere. What's * important is that we serialize changes to the mask. The * rw_exit() will issue a write memory barrier on our behalf, * and force the changes out to other CPUs (as it must use an * atomic operation, draining the local CPU's store buffers). */ cwdi = p->p_cwdi; rw_enter(&cwdi->cwdi_lock, RW_WRITER); *retval = cwdi->cwdi_cmask; cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; rw_exit(&cwdi->cwdi_lock); return (0); } int dorevoke(struct vnode *vp, kauth_cred_t cred) { struct vattr vattr; int error; if ((error = VOP_GETATTR(vp, &vattr, cred)) != 0) return error; if (kauth_cred_geteuid(cred) == vattr.va_uid || (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL)) == 0) VOP_REVOKE(vp, REVOKEALL); return (error); } /* * Void all references to file by ripping underlying filesystem * away from vnode. */ /* ARGSUSED */ int sys_revoke(struct lwp *l, const struct sys_revoke_args *uap, register_t *retval) { /* { syscallarg(const char *) path; } */ struct vnode *vp; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG(uap, path)); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; error = dorevoke(vp, l->l_cred); vrele(vp); return (error); }