/* * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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 8.13 (Berkeley) 4/15/94 * $Id: vfs_syscalls.c,v 1.126 1999/08/02 21:34:46 imp Exp $ */ /* For 4.3 integer FS ID compatibility */ #include "opt_compat.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int change_dir __P((struct nameidata *ndp, struct proc *p)); static void checkdirs __P((struct vnode *olddp)); static int chroot_refuse_vdir_fds __P((struct filedesc *fdp)); static int setfown __P((struct proc *, struct vnode *, uid_t, gid_t)); static int setfmode __P((struct proc *, struct vnode *, int)); static int setfflags __P((struct proc *, struct vnode *, int)); static int setutimes __P((struct proc *, struct vnode *, struct timeval *, int)); static int usermount = 0; /* if 1, non-root can mount fs. */ int (*union_dircheckp) __P((struct proc *, struct vnode **, struct file *)); SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, ""); /* * Virtual File System System Calls */ /* * Mount a file system. */ #ifndef _SYS_SYSPROTO_H_ struct mount_args { char *type; char *path; int flags; caddr_t data; }; #endif /* ARGSUSED */ int mount(p, uap) struct proc *p; register struct mount_args /* { syscallarg(char *) type; syscallarg(char *) path; syscallarg(int) flags; syscallarg(caddr_t) data; } */ *uap; { struct vnode *vp; struct mount *mp; struct vfsconf *vfsp; int error, flag = 0, flag2 = 0; struct vattr va; #ifdef COMPAT_43 u_long fstypenum; #endif struct nameidata nd; char fstypename[MFSNAMELEN]; if (usermount == 0 && (error = suser(p))) return (error); /* * Do not allow NFS export by non-root users. */ if (SCARG(uap, flags) & MNT_EXPORTED) { error = suser(p); if (error) return (error); } /* * Silently enforce MNT_NOSUID and MNT_NODEV for non-root users */ if (suser_xxx(p->p_ucred, 0, 0)) SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; /* * Get vnode to be covered */ NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if (SCARG(uap, flags) & MNT_UPDATE) { if ((vp->v_flag & VROOT) == 0) { vput(vp); return (EINVAL); } mp = vp->v_mount; flag = mp->mnt_flag; flag2 = mp->mnt_kern_flag; /* * We only allow the filesystem to be reloaded if it * is currently mounted read-only. */ if ((SCARG(uap, flags) & MNT_RELOAD) && ((mp->mnt_flag & MNT_RDONLY) == 0)) { vput(vp); return (EOPNOTSUPP); /* Needs translation */ } mp->mnt_flag |= SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE); /* * Only root, or the user that did the original mount is * permitted to update it. */ if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid && (error = suser(p))) { vput(vp); return (error); } if (vfs_busy(mp, LK_NOWAIT, 0, p)) { vput(vp); return (EBUSY); } VOP_UNLOCK(vp, 0, p); goto update; } /* * 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, p->p_ucred, p)) || (va.va_uid != p->p_ucred->cr_uid && (error = suser(p)))) { vput(vp); return (error); } if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) return (error); if (vp->v_type != VDIR) { vput(vp); return (ENOTDIR); } #ifdef COMPAT_43 /* * Historically filesystem types were identified by number. 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. */ fstypenum = (uintptr_t)SCARG(uap, type); if (fstypenum < maxvfsconf) { for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) if (vfsp->vfc_typenum == fstypenum) break; if (vfsp == NULL) { vput(vp); return (ENODEV); } strncpy(fstypename, vfsp->vfc_name, MFSNAMELEN); } else #endif /* COMPAT_43 */ if ((error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL)) != 0) { vput(vp); return (error); } for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) if (!strcmp(vfsp->vfc_name, fstypename)) break; if (vfsp == NULL) { linker_file_t lf; /* Refuse to load modules if securelevel raised */ if (securelevel > 0) { vput(vp); return EPERM; } /* Only load modules for root (very important!) */ if ((error = suser(p)) != 0) { vput(vp); return error; } error = linker_load_file(fstypename, &lf); if (error || lf == NULL) { vput(vp); if (lf == NULL) error = ENODEV; return error; } lf->userrefs++; /* lookup again, see if the VFS was loaded */ for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) if (!strcmp(vfsp->vfc_name, fstypename)) break; if (vfsp == NULL) { lf->userrefs--; linker_file_unload(lf); vput(vp); return (ENODEV); } } simple_lock(&vp->v_interlock); if ((vp->v_flag & VMOUNT) != 0 || vp->v_mountedhere != NULL) { simple_unlock(&vp->v_interlock); vput(vp); return (EBUSY); } vp->v_flag |= VMOUNT; simple_unlock(&vp->v_interlock); /* * Allocate and initialize the filesystem. */ mp = (struct mount *)malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); bzero((char *)mp, (u_long)sizeof(struct mount)); lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, LK_NOPAUSE); (void)vfs_busy(mp, LK_NOWAIT, 0, p); mp->mnt_op = vfsp->vfc_vfsops; mp->mnt_vfc = vfsp; vfsp->vfc_refcount++; mp->mnt_stat.f_type = vfsp->vfc_typenum; mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); mp->mnt_vnodecovered = vp; mp->mnt_stat.f_owner = p->p_ucred->cr_uid; VOP_UNLOCK(vp, 0, p); update: /* * Set the mount level flags. */ if (SCARG(uap, flags) & MNT_RDONLY) mp->mnt_flag |= MNT_RDONLY; else if (mp->mnt_flag & MNT_RDONLY) mp->mnt_kern_flag |= MNTK_WANTRDWR; mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOATIME | MNT_NOSYMFOLLOW | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR); mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_FORCE | MNT_NOSYMFOLLOW | MNT_NOATIME | MNT_NOCLUSTERR | MNT_NOCLUSTERW | MNT_SUIDDIR); /* * Mount the filesystem. */ error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); if (mp->mnt_flag & MNT_UPDATE) { vrele(vp); if (mp->mnt_kern_flag & MNTK_WANTRDWR) mp->mnt_flag &= ~MNT_RDONLY; mp->mnt_flag &=~ (MNT_UPDATE | MNT_RELOAD | MNT_FORCE); mp->mnt_kern_flag &=~ MNTK_WANTRDWR; if (error) { mp->mnt_flag = flag; mp->mnt_kern_flag = flag2; } if ((mp->mnt_flag & MNT_RDONLY) == 0) { if (mp->mnt_syncer == NULL) error = vfs_allocate_syncvnode(mp); } else { if (mp->mnt_syncer != NULL) vrele(mp->mnt_syncer); mp->mnt_syncer = NULL; } vfs_unbusy(mp, p); return (error); } vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); /* * Put the new filesystem on the mount list after root. */ cache_purge(vp); if (!error) { simple_lock(&vp->v_interlock); vp->v_flag &= ~VMOUNT; vp->v_mountedhere = mp; simple_unlock(&vp->v_interlock); simple_lock(&mountlist_slock); CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); simple_unlock(&mountlist_slock); checkdirs(vp); VOP_UNLOCK(vp, 0, p); if ((mp->mnt_flag & MNT_RDONLY) == 0) error = vfs_allocate_syncvnode(mp); vfs_unbusy(mp, p); if ((error = VFS_START(mp, 0, p)) != 0) vrele(vp); } else { simple_lock(&vp->v_interlock); vp->v_flag &= ~VMOUNT; simple_unlock(&vp->v_interlock); mp->mnt_vfc->vfc_refcount--; vfs_unbusy(mp, p); free((caddr_t)mp, M_MOUNT); vput(vp); } 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. */ static void checkdirs(olddp) struct vnode *olddp; { struct filedesc *fdp; struct vnode *newdp; struct proc *p; if (olddp->v_usecount == 1) return; if (VFS_ROOT(olddp->v_mountedhere, &newdp)) panic("mount: lost mount"); for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { fdp = p->p_fd; if (fdp->fd_cdir == olddp) { vrele(fdp->fd_cdir); VREF(newdp); fdp->fd_cdir = newdp; } if (fdp->fd_rdir == olddp) { vrele(fdp->fd_rdir); VREF(newdp); fdp->fd_rdir = newdp; } } 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). */ #ifndef _SYS_SYSPROTO_H_ struct unmount_args { char *path; int flags; }; #endif /* ARGSUSED */ int unmount(p, uap) struct proc *p; register struct unmount_args /* { syscallarg(char *) path; syscallarg(int) flags; } */ *uap; { register struct vnode *vp; struct mount *mp; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; mp = vp->v_mount; /* * Only root, or the user that did the original mount is * permitted to unmount this filesystem. */ if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && (error = suser(p))) { vput(vp); return (error); } /* * Don't allow unmounting the root file system. */ if (mp->mnt_flag & MNT_ROOTFS) { vput(vp); return (EINVAL); } /* * Must be the root of the filesystem */ if ((vp->v_flag & VROOT) == 0) { vput(vp); return (EINVAL); } vput(vp); return (dounmount(mp, SCARG(uap, flags), p)); } /* * Do the actual file system unmount. */ int dounmount(mp, flags, p) register struct mount *mp; int flags; struct proc *p; { struct vnode *coveredvp; int error; int async_flag; simple_lock(&mountlist_slock); mp->mnt_kern_flag |= MNTK_UNMOUNT; lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock, p); if (mp->mnt_flag & MNT_EXPUBLIC) vfs_setpublicfs(NULL, NULL, NULL); vfs_msync(mp, MNT_WAIT); async_flag = 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) vrele(mp->mnt_syncer); if (((mp->mnt_flag & MNT_RDONLY) || (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || (flags & MNT_FORCE)) error = VFS_UNMOUNT(mp, flags, p); simple_lock(&mountlist_slock); if (error) { if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL) (void) vfs_allocate_syncvnode(mp); mp->mnt_kern_flag &= ~MNTK_UNMOUNT; mp->mnt_flag |= async_flag; lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, &mountlist_slock, p); if (mp->mnt_kern_flag & MNTK_MWAIT) wakeup((caddr_t)mp); return (error); } CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { coveredvp->v_mountedhere = (struct mount *)0; vrele(coveredvp); } mp->mnt_vfc->vfc_refcount--; if (mp->mnt_vnodelist.lh_first != NULL) panic("unmount: dangling vnode"); lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock, p); if (mp->mnt_kern_flag & MNTK_MWAIT) wakeup((caddr_t)mp); free((caddr_t)mp, M_MOUNT); return (0); } /* * Sync each mounted filesystem. */ #ifndef _SYS_SYSPROTO_H_ struct sync_args { int dummy; }; #endif #ifdef DEBUG static int syncprt = 0; SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, ""); #endif /* ARGSUSED */ int sync(p, uap) struct proc *p; struct sync_args *uap; { register struct mount *mp, *nmp; int asyncflag; simple_lock(&mountlist_slock); for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) { nmp = mp->mnt_list.cqe_next; continue; } if ((mp->mnt_flag & MNT_RDONLY) == 0) { asyncflag = mp->mnt_flag & MNT_ASYNC; mp->mnt_flag &= ~MNT_ASYNC; vfs_msync(mp, MNT_NOWAIT); VFS_SYNC(mp, MNT_NOWAIT, ((p != NULL) ? p->p_ucred : NOCRED), p); mp->mnt_flag |= asyncflag; } simple_lock(&mountlist_slock); nmp = mp->mnt_list.cqe_next; vfs_unbusy(mp, p); } simple_unlock(&mountlist_slock); #if 0 /* * XXX don't call vfs_bufstats() yet because that routine * was not imported in the Lite2 merge. */ #ifdef DIAGNOSTIC if (syncprt) vfs_bufstats(); #endif /* DIAGNOSTIC */ #endif return (0); } /* XXX PRISON: could be per prison flag */ static int prison_quotas; #if 0 SYSCTL_INT(_kern_prison, OID_AUTO, quotas, CTLFLAG_RW, &prison_quotas, 0, ""); #endif /* * Change filesystem quotas. */ #ifndef _SYS_SYSPROTO_H_ struct quotactl_args { char *path; int cmd; int uid; caddr_t arg; }; #endif /* ARGSUSED */ int quotactl(p, uap) struct proc *p; register struct quotactl_args /* { syscallarg(char *) path; syscallarg(int) cmd; syscallarg(int) uid; syscallarg(caddr_t) arg; } */ *uap; { register struct mount *mp; int error; struct nameidata nd; if (p->p_prison && !prison_quotas) return (EPERM); NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); mp = nd.ni_vp->v_mount; vrele(nd.ni_vp); return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), SCARG(uap, arg), p)); } /* * Get filesystem statistics. */ #ifndef _SYS_SYSPROTO_H_ struct statfs_args { char *path; struct statfs *buf; }; #endif /* ARGSUSED */ int statfs(p, uap) struct proc *p; register struct statfs_args /* { syscallarg(char *) path; syscallarg(struct statfs *) buf; } */ *uap; { register struct mount *mp; register struct statfs *sp; int error; struct nameidata nd; struct statfs sb; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); mp = nd.ni_vp->v_mount; sp = &mp->mnt_stat; vrele(nd.ni_vp); error = VFS_STATFS(mp, sp, p); if (error) return (error); sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; if (suser_xxx(p->p_ucred, 0, 0)) { bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb)); sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; sp = &sb; } return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); } /* * Get filesystem statistics. */ #ifndef _SYS_SYSPROTO_H_ struct fstatfs_args { int fd; struct statfs *buf; }; #endif /* ARGSUSED */ int fstatfs(p, uap) struct proc *p; register struct fstatfs_args /* { syscallarg(int) fd; syscallarg(struct statfs *) buf; } */ *uap; { struct file *fp; struct mount *mp; register struct statfs *sp; int error; struct statfs sb; if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); mp = ((struct vnode *)fp->f_data)->v_mount; sp = &mp->mnt_stat; error = VFS_STATFS(mp, sp, p); if (error) return (error); sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; if (suser_xxx(p->p_ucred, 0, 0)) { bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb)); sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; sp = &sb; } return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp))); } /* * Get statistics on all filesystems. */ #ifndef _SYS_SYSPROTO_H_ struct getfsstat_args { struct statfs *buf; long bufsize; int flags; }; #endif int getfsstat(p, uap) struct proc *p; register struct getfsstat_args /* { syscallarg(struct statfs *) buf; syscallarg(long) bufsize; syscallarg(int) flags; } */ *uap; { register struct mount *mp, *nmp; register struct statfs *sp; caddr_t sfsp; long count, maxcount, error; maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); sfsp = (caddr_t)SCARG(uap, buf); count = 0; simple_lock(&mountlist_slock); for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) { if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) { nmp = mp->mnt_list.cqe_next; continue; } if (sfsp && count < maxcount) { sp = &mp->mnt_stat; /* * If MNT_NOWAIT or MNT_LAZY is specified, do not * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY * overrides MNT_WAIT. */ if (((SCARG(uap, flags) & (MNT_LAZY|MNT_NOWAIT)) == 0 || (SCARG(uap, flags) & MNT_WAIT)) && (error = VFS_STATFS(mp, sp, p))) { simple_lock(&mountlist_slock); nmp = mp->mnt_list.cqe_next; vfs_unbusy(mp, p); continue; } sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; error = copyout((caddr_t)sp, sfsp, sizeof(*sp)); if (error) { vfs_unbusy(mp, p); return (error); } sfsp += sizeof(*sp); } count++; simple_lock(&mountlist_slock); nmp = mp->mnt_list.cqe_next; vfs_unbusy(mp, p); } simple_unlock(&mountlist_slock); if (sfsp && count > maxcount) p->p_retval[0] = maxcount; else p->p_retval[0] = count; return (0); } /* * Change current working directory to a given file descriptor. */ #ifndef _SYS_SYSPROTO_H_ struct fchdir_args { int fd; }; #endif /* ARGSUSED */ int fchdir(p, uap) struct proc *p; struct fchdir_args /* { syscallarg(int) fd; } */ *uap; { register struct filedesc *fdp = p->p_fd; struct vnode *vp, *tdp; struct mount *mp; struct file *fp; int error; if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) return (error); vp = (struct vnode *)fp->f_data; VREF(vp); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); if (vp->v_type != VDIR) error = ENOTDIR; else error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); while (!error && (mp = vp->v_mountedhere) != NULL) { if (vfs_busy(mp, 0, 0, p)) continue; error = VFS_ROOT(mp, &tdp); vfs_unbusy(mp, p); if (error) break; vput(vp); vp = tdp; } if (error) { vput(vp); return (error); } VOP_UNLOCK(vp, 0, p); vrele(fdp->fd_cdir); fdp->fd_cdir = vp; return (0); } /* * Change current working directory (``.''). */ #ifndef _SYS_SYSPROTO_H_ struct chdir_args { char *path; }; #endif /* ARGSUSED */ int chdir(p, uap) struct proc *p; struct chdir_args /* { syscallarg(char *) path; } */ *uap; { register struct filedesc *fdp = p->p_fd; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = change_dir(&nd, p)) != 0) return (error); vrele(fdp->fd_cdir); fdp->fd_cdir = nd.ni_vp; return (0); } /* * Helper function for raised chroot(2) security function: Refuse if * any filedescriptors are open directories. */ static int chroot_refuse_vdir_fds(fdp) struct filedesc *fdp; { struct vnode *vp; struct file *fp; int error; int fd; for (fd = 0; fd < fdp->fd_nfiles ; fd++) { error = getvnode(fdp, fd, &fp); if (error) continue; vp = (struct vnode *)fp->f_data; if (vp->v_type != VDIR) continue; return(EPERM); } return (0); } /* * This sysctl determines if we will allow a process to chroot(2) if it * has a directory open: * 0: disallowed for all processes. * 1: allowed for processes that were not already chroot(2)'ed. * 2: allowed for all processes. */ static int chroot_allow_open_directories = 1; SYSCTL_INT(_kern, OID_AUTO, chroot_allow_open_directories, CTLFLAG_RW, &chroot_allow_open_directories, 0, ""); /* * Change notion of root (``/'') directory. */ #ifndef _SYS_SYSPROTO_H_ struct chroot_args { char *path; }; #endif /* ARGSUSED */ int chroot(p, uap) struct proc *p; struct chroot_args /* { syscallarg(char *) path; } */ *uap; { register struct filedesc *fdp = p->p_fd; int error; struct nameidata nd; error = suser_xxx(0, p, PRISON_ROOT); if (error) return (error); if (chroot_allow_open_directories == 0 || (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) error = chroot_refuse_vdir_fds(fdp); if (error) return (error); NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = change_dir(&nd, p)) != 0) return (error); vrele(fdp->fd_rdir); fdp->fd_rdir = nd.ni_vp; return (0); } /* * Common routine for chroot and chdir. */ static int change_dir(ndp, p) register struct nameidata *ndp; struct proc *p; { struct vnode *vp; int error; error = namei(ndp); if (error) return (error); vp = ndp->ni_vp; if (vp->v_type != VDIR) error = ENOTDIR; else error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); if (error) vput(vp); else VOP_UNLOCK(vp, 0, p); return (error); } /* * Check permissions, allocate an open file structure, * and call the device open routine if any. */ #ifndef _SYS_SYSPROTO_H_ struct open_args { char *path; int flags; int mode; }; #endif int open(p, uap) struct proc *p; register struct open_args /* { syscallarg(char *) path; syscallarg(int) flags; syscallarg(int) mode; } */ *uap; { register struct filedesc *fdp = p->p_fd; register struct file *fp; register struct vnode *vp; int cmode, flags, oflags; struct file *nfp; int type, indx, error; struct flock lf; struct nameidata nd; oflags = SCARG(uap, flags); if ((oflags & O_ACCMODE) == O_ACCMODE) return (EINVAL); flags = FFLAGS(oflags); error = falloc(p, &nfp, &indx); if (error) return (error); fp = nfp; cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); p->p_dupfd = -indx - 1; /* XXX check for fdopen */ error = vn_open(&nd, flags, cmode); if (error) { ffree(fp); if ((error == ENODEV || error == ENXIO) && p->p_dupfd >= 0 && /* XXX from fdopen */ (error = dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) { p->p_retval[0] = indx; return (0); } if (error == ERESTART) error = EINTR; fdp->fd_ofiles[indx] = NULL; return (error); } p->p_dupfd = 0; vp = nd.ni_vp; fp->f_flag = flags & FMASK; fp->f_type = (vp->v_type == VFIFO ? DTYPE_FIFO : DTYPE_VNODE); fp->f_ops = &vnops; fp->f_data = (caddr_t)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, p); if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { (void) vn_close(vp, fp->f_flag, fp->f_cred, p); ffree(fp); fdp->fd_ofiles[indx] = NULL; return (error); } vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); fp->f_flag |= FHASLOCK; } if (vn_canvmio(vp) == TRUE && vp->v_object == NULL) vfs_object_create(vp, p, p->p_ucred); VOP_UNLOCK(vp, 0, p); p->p_retval[0] = indx; return (0); } #ifdef COMPAT_43 /* * Create a file. */ #ifndef _SYS_SYSPROTO_H_ struct ocreat_args { char *path; int mode; }; #endif int ocreat(p, uap) struct proc *p; register struct ocreat_args /* { syscallarg(char *) path; syscallarg(int) mode; } */ *uap; { struct open_args /* { syscallarg(char *) path; syscallarg(int) flags; syscallarg(int) mode; } */ nuap; SCARG(&nuap, path) = SCARG(uap, path); SCARG(&nuap, mode) = SCARG(uap, mode); SCARG(&nuap, flags) = O_WRONLY | O_CREAT | O_TRUNC; return (open(p, &nuap)); } #endif /* COMPAT_43 */ /* * Create a special file. */ #ifndef _SYS_SYSPROTO_H_ struct mknod_args { char *path; int mode; int dev; }; #endif /* ARGSUSED */ int mknod(p, uap) struct proc *p; register struct mknod_args /* { syscallarg(char *) path; syscallarg(int) mode; syscallarg(int) dev; } */ *uap; { register struct vnode *vp; struct vattr vattr; int error; int whiteout = 0; struct nameidata nd; switch (SCARG(uap, mode) & S_IFMT) { case S_IFCHR: case S_IFBLK: error = suser(p); break; default: error = suser_xxx(0, p, PRISON_ROOT); break; } if (error) return (error); NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if (vp != NULL) error = EEXIST; else { VATTR_NULL(&vattr); vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; vattr.va_rdev = SCARG(uap, dev); whiteout = 0; switch (SCARG(uap, 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: whiteout = 1; break; default: error = EINVAL; break; } } if (!error) { VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); if (whiteout) { error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); if (error) VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); vput(nd.ni_dvp); } else { error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); vput(nd.ni_dvp); } } 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); } ASSERT_VOP_UNLOCKED(nd.ni_dvp, "mknod"); ASSERT_VOP_UNLOCKED(nd.ni_vp, "mknod"); return (error); } /* * Create a named pipe. */ #ifndef _SYS_SYSPROTO_H_ struct mkfifo_args { char *path; int mode; }; #endif /* ARGSUSED */ int mkfifo(p, uap) struct proc *p; register struct mkfifo_args /* { syscallarg(char *) path; syscallarg(int) mode; } */ *uap; { struct vattr vattr; int error; struct nameidata nd; NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); 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; vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask; VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); vput(nd.ni_dvp); return (error); } /* * Make a hard file link. */ #ifndef _SYS_SYSPROTO_H_ struct link_args { char *path; char *link; }; #endif /* ARGSUSED */ int link(p, uap) struct proc *p; register struct link_args /* { syscallarg(char *) path; syscallarg(char *) link; } */ *uap; { register struct vnode *vp; struct nameidata nd; int error; NDINIT(&nd, LOOKUP, FOLLOW|NOOBJ, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if (vp->v_type == VDIR) error = EPERM; /* POSIX */ else { NDINIT(&nd, CREATE, LOCKPARENT|NOOBJ, UIO_USERSPACE, SCARG(uap, link), p); error = namei(&nd); if (!error) { if (nd.ni_vp != NULL) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_vp) vrele(nd.ni_vp); error = EEXIST; } else { VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); } if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); } } vrele(vp); ASSERT_VOP_UNLOCKED(nd.ni_dvp, "link"); ASSERT_VOP_UNLOCKED(nd.ni_vp, "link"); return (error); } /* * Make a symbolic link. */ #ifndef _SYS_SYSPROTO_H_ struct symlink_args { char *path; char *link; }; #endif /* ARGSUSED */ int symlink(p, uap) struct proc *p; register struct symlink_args /* { syscallarg(char *) path; syscallarg(char *) link; } */ *uap; { struct vattr vattr; char *path; int error; struct nameidata nd; path = zalloc(namei_zone); if ((error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL)) != 0) goto out; NDINIT(&nd, CREATE, LOCKPARENT|NOOBJ, UIO_USERSPACE, SCARG(uap, link), p); 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_mode = ACCESSPERMS &~ p->p_fd->fd_cmask; VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); vput(nd.ni_dvp); ASSERT_VOP_UNLOCKED(nd.ni_dvp, "symlink"); ASSERT_VOP_UNLOCKED(nd.ni_vp, "symlink"); out: zfree(namei_zone, path); return (error); } /* * Delete a whiteout from the filesystem. */ /* ARGSUSED */ int undelete(p, uap) struct proc *p; register struct undelete_args /* { syscallarg(char *) path; } */ *uap; { int error; struct nameidata nd; NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, SCARG(uap, path), p); 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); } VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); vput(nd.ni_dvp); ASSERT_VOP_UNLOCKED(nd.ni_dvp, "undelete"); ASSERT_VOP_UNLOCKED(nd.ni_vp, "undelete"); return (error); } /* * Delete a name from the filesystem. */ #ifndef _SYS_SYSPROTO_H_ struct unlink_args { char *path; }; #endif /* ARGSUSED */ int unlink(p, uap) struct proc *p; struct unlink_args /* { syscallarg(char *) path; } */ *uap; { register struct vnode *vp; int error; struct nameidata nd; NDINIT(&nd, DELETE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); if (vp->v_type == VDIR) error = EPERM; /* POSIX */ else { /* * The root of a mounted filesystem cannot be deleted. * * XXX: can this only be a VDIR case? */ if (vp->v_flag & VROOT) error = EBUSY; } if (!error) { VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); } 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 != NULLVP) vput(vp); ASSERT_VOP_UNLOCKED(nd.ni_dvp, "unlink"); ASSERT_VOP_UNLOCKED(nd.ni_vp, "unlink"); return (error); } /* * Reposition read/write file offset. */ #ifndef _SYS_SYSPROTO_H_ struct lseek_args { int fd; int pad; off_t offset; int whence; }; #endif int lseek(p, uap) struct proc *p; register struct lseek_args /* { syscallarg(int) fd; syscallarg(int) pad; syscallarg(off_t) offset; syscallarg(int) whence; } */ *uap; { struct ucred *cred = p->p_ucred; register struct filedesc *fdp = p->p_fd; register struct file *fp; struct vattr vattr; int error; if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) return (EBADF); if (fp->f_type != DTYPE_VNODE) return (ESPIPE); switch (SCARG(uap, whence)) { case L_INCR: fp->f_offset += SCARG(uap, offset); break; case L_XTND: error=VOP_GETATTR((struct vnode *)fp->f_data, &vattr, cred, p); if (error) return (error); fp->f_offset = SCARG(uap, offset) + vattr.va_size; break; case L_SET: fp->f_offset = SCARG(uap, offset); break; default: return (EINVAL); } *(off_t *)(p->p_retval) = fp->f_offset; return (0); } #if defined(COMPAT_43) || defined(COMPAT_SUNOS) /* * Reposition read/write file offset. */ #ifndef _SYS_SYSPROTO_H_ struct olseek_args { int fd; long offset; int whence; }; #endif int olseek(p, uap) struct proc *p; register struct olseek_args /* { syscallarg(int) fd; syscallarg(long) offset; syscallarg(int) whence; } */ *uap; { struct lseek_args /* { syscallarg(int) fd; syscallarg(int) pad; syscallarg(off_t) offset; syscallarg(int) whence; } */ nuap; int error; SCARG(&nuap, fd) = SCARG(uap, fd); SCARG(&nuap, offset) = SCARG(uap, offset); SCARG(&nuap, whence) = SCARG(uap, whence); error = lseek(p, &nuap); return (error); } #endif /* COMPAT_43 */ /* * Check access permissions. */ #ifndef _SYS_SYSPROTO_H_ struct access_args { char *path; int flags; }; #endif int access(p, uap) struct proc *p; register struct access_args /* { syscallarg(char *) path; syscallarg(int) flags; } */ *uap; { register struct ucred *cred = p->p_ucred; register struct vnode *vp; int error, flags, t_gid, t_uid; struct nameidata nd; t_uid = cred->cr_uid; t_gid = cred->cr_groups[0]; cred->cr_uid = p->p_cred->p_ruid; cred->cr_groups[0] = p->p_cred->p_rgid; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) goto out1; 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; if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) error = VOP_ACCESS(vp, flags, cred, p); } vput(vp); out1: cred->cr_uid = t_uid; cred->cr_groups[0] = t_gid; return (error); } #if defined(COMPAT_43) || defined(COMPAT_SUNOS) /* * Get file status; this version follows links. */ #ifndef _SYS_SYSPROTO_H_ struct ostat_args { char *path; struct ostat *ub; }; #endif /* ARGSUSED */ int ostat(p, uap) struct proc *p; register struct ostat_args /* { syscallarg(char *) path; syscallarg(struct ostat *) ub; } */ *uap; { struct stat sb; struct ostat osb; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = vn_stat(nd.ni_vp, &sb, p); vput(nd.ni_vp); if (error) return (error); cvtstat(&sb, &osb); error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); return (error); } /* * Get file status; this version does not follow links. */ #ifndef _SYS_SYSPROTO_H_ struct olstat_args { char *path; struct ostat *ub; }; #endif /* ARGSUSED */ int olstat(p, uap) struct proc *p; register struct olstat_args /* { syscallarg(char *) path; syscallarg(struct ostat *) ub; } */ *uap; { struct vnode *vp; struct stat sb; struct ostat osb; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; error = vn_stat(vp, &sb, p); vput(vp); if (error) return (error); cvtstat(&sb, &osb); error = copyout((caddr_t)&osb, (caddr_t)SCARG(uap, ub), sizeof (osb)); return (error); } /* * Convert from an old to a new stat structure. */ void cvtstat(st, ost) struct stat *st; struct ostat *ost; { ost->st_dev = st->st_dev; ost->st_ino = st->st_ino; ost->st_mode = st->st_mode; ost->st_nlink = st->st_nlink; ost->st_uid = st->st_uid; ost->st_gid = st->st_gid; ost->st_rdev = st->st_rdev; if (st->st_size < (quad_t)1 << 32) ost->st_size = st->st_size; else ost->st_size = -2; ost->st_atime = st->st_atime; ost->st_mtime = st->st_mtime; ost->st_ctime = st->st_ctime; ost->st_blksize = st->st_blksize; ost->st_blocks = st->st_blocks; ost->st_flags = st->st_flags; ost->st_gen = st->st_gen; } #endif /* COMPAT_43 || COMPAT_SUNOS */ /* * Get file status; this version follows links. */ #ifndef _SYS_SYSPROTO_H_ struct stat_args { char *path; struct stat *ub; }; #endif /* ARGSUSED */ int stat(p, uap) struct proc *p; register struct stat_args /* { syscallarg(char *) path; syscallarg(struct stat *) ub; } */ *uap; { struct stat sb; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = vn_stat(nd.ni_vp, &sb, p); vput(nd.ni_vp); if (error) return (error); error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); return (error); } /* * Get file status; this version does not follow links. */ #ifndef _SYS_SYSPROTO_H_ struct lstat_args { char *path; struct stat *ub; }; #endif /* ARGSUSED */ int lstat(p, uap) struct proc *p; register struct lstat_args /* { syscallarg(char *) path; syscallarg(struct stat *) ub; } */ *uap; { int error; struct vnode *vp; struct stat sb; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; error = vn_stat(vp, &sb, p); vput(vp); if (error) return (error); error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb)); return (error); } void cvtnstat(sb, nsb) struct stat *sb; struct nstat *nsb; { nsb->st_dev = sb->st_dev; nsb->st_ino = sb->st_ino; nsb->st_mode = sb->st_mode; nsb->st_nlink = sb->st_nlink; nsb->st_uid = sb->st_uid; nsb->st_gid = sb->st_gid; nsb->st_rdev = sb->st_rdev; nsb->st_atimespec = sb->st_atimespec; nsb->st_mtimespec = sb->st_mtimespec; nsb->st_ctimespec = sb->st_ctimespec; nsb->st_size = sb->st_size; nsb->st_blocks = sb->st_blocks; nsb->st_blksize = sb->st_blksize; nsb->st_flags = sb->st_flags; nsb->st_gen = sb->st_gen; } #ifndef _SYS_SYSPROTO_H_ struct nstat_args { char *path; struct nstat *ub; }; #endif /* ARGSUSED */ int nstat(p, uap) struct proc *p; register struct nstat_args /* { syscallarg(char *) path; syscallarg(struct nstat *) ub; } */ *uap; { struct stat sb; struct nstat nsb; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = vn_stat(nd.ni_vp, &sb, p); vput(nd.ni_vp); if (error) return (error); cvtnstat(&sb, &nsb); error = copyout((caddr_t)&nsb, (caddr_t)SCARG(uap, ub), sizeof (nsb)); return (error); } /* * Get file status; this version does not follow links. */ #ifndef _SYS_SYSPROTO_H_ struct lstat_args { char *path; struct stat *ub; }; #endif /* ARGSUSED */ int nlstat(p, uap) struct proc *p; register struct nlstat_args /* { syscallarg(char *) path; syscallarg(struct nstat *) ub; } */ *uap; { int error; struct vnode *vp; struct stat sb; struct nstat nsb; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; error = vn_stat(vp, &sb, p); vput(vp); if (error) return (error); cvtnstat(&sb, &nsb); error = copyout((caddr_t)&nsb, (caddr_t)SCARG(uap, ub), sizeof (nsb)); return (error); } /* * Get configurable pathname variables. */ #ifndef _SYS_SYSPROTO_H_ struct pathconf_args { char *path; int name; }; #endif /* ARGSUSED */ int pathconf(p, uap) struct proc *p; register struct pathconf_args /* { syscallarg(char *) path; syscallarg(int) name; } */ *uap; { int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), p->p_retval); vput(nd.ni_vp); return (error); } /* * Return target name of a symbolic link. */ #ifndef _SYS_SYSPROTO_H_ struct readlink_args { char *path; char *buf; int count; }; #endif /* ARGSUSED */ int readlink(p, uap) struct proc *p; register struct readlink_args /* { syscallarg(char *) path; syscallarg(char *) buf; syscallarg(int) count; } */ *uap; { register struct vnode *vp; struct iovec aiov; struct uio auio; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | NOOBJ, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if (vp->v_type != VLNK) error = EINVAL; else { 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; auio.uio_segflg = UIO_USERSPACE; auio.uio_procp = p; auio.uio_resid = SCARG(uap, count); error = VOP_READLINK(vp, &auio, p->p_ucred); } vput(vp); p->p_retval[0] = SCARG(uap, count) - auio.uio_resid; return (error); } static int setfflags(p, vp, flags) struct proc *p; struct vnode *vp; int flags; { int error; struct vattr vattr; /* * Don't allow setting of flags on devices for non-root users. */ if ((vp->va_type == VCHR || vp->va_type == VBLK) && (error = suser_xxx(p->ucred, p, PRISON_ROOT))) return error; VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); VATTR_NULL(&vattr); vattr.va_flags = flags; error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); VOP_UNLOCK(vp, 0, p); return error; } /* * Change flags of a file given a path name. */ #ifndef _SYS_SYSPROTO_H_ struct chflags_args { char *path; int flags; }; #endif /* ARGSUSED */ int chflags(p, uap) struct proc *p; register struct chflags_args /* { syscallarg(char *) path; syscallarg(int) flags; } */ *uap; { int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = setfflags(p, nd.ni_vp, SCARG(uap, flags)); vrele(nd.ni_vp); return error; } /* * Change flags of a file given a file descriptor. */ #ifndef _SYS_SYSPROTO_H_ struct fchflags_args { int fd; int flags; }; #endif /* ARGSUSED */ int fchflags(p, uap) struct proc *p; register struct fchflags_args /* { syscallarg(int) fd; syscallarg(int) flags; } */ *uap; { struct file *fp; int error; if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); return setfflags(p, (struct vnode *) fp->f_data, SCARG(uap, flags)); } static int setfmode(p, vp, mode) struct proc *p; struct vnode *vp; int mode; { int error; struct vattr vattr; VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); VATTR_NULL(&vattr); vattr.va_mode = mode & ALLPERMS; error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); VOP_UNLOCK(vp, 0, p); return error; } /* * Change mode of a file given path name. */ #ifndef _SYS_SYSPROTO_H_ struct chmod_args { char *path; int mode; }; #endif /* ARGSUSED */ int chmod(p, uap) struct proc *p; register struct chmod_args /* { syscallarg(char *) path; syscallarg(int) mode; } */ *uap; { int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = setfmode(p, nd.ni_vp, SCARG(uap, mode)); vrele(nd.ni_vp); return error; } /* * Change mode of a file given path name (don't follow links.) */ #ifndef _SYS_SYSPROTO_H_ struct lchmod_args { char *path; int mode; }; #endif /* ARGSUSED */ int lchmod(p, uap) struct proc *p; register struct lchmod_args /* { syscallarg(char *) path; syscallarg(int) mode; } */ *uap; { int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = setfmode(p, nd.ni_vp, SCARG(uap, mode)); vrele(nd.ni_vp); return error; } /* * Change mode of a file given a file descriptor. */ #ifndef _SYS_SYSPROTO_H_ struct fchmod_args { int fd; int mode; }; #endif /* ARGSUSED */ int fchmod(p, uap) struct proc *p; register struct fchmod_args /* { syscallarg(int) fd; syscallarg(int) mode; } */ *uap; { struct file *fp; int error; if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); return setfmode(p, (struct vnode *)fp->f_data, SCARG(uap, mode)); } static int setfown(p, vp, uid, gid) struct proc *p; struct vnode *vp; uid_t uid; gid_t gid; { int error; struct vattr vattr; VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); VATTR_NULL(&vattr); vattr.va_uid = uid; vattr.va_gid = gid; error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); VOP_UNLOCK(vp, 0, p); return error; } /* * Set ownership given a path name. */ #ifndef _SYS_SYSPROTO_H_ struct chown_args { char *path; int uid; int gid; }; #endif /* ARGSUSED */ int chown(p, uap) struct proc *p; register struct chown_args /* { syscallarg(char *) path; syscallarg(int) uid; syscallarg(int) gid; } */ *uap; { int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = setfown(p, nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid)); vrele(nd.ni_vp); return (error); } /* * Set ownership given a path name, do not cross symlinks. */ #ifndef _SYS_SYSPROTO_H_ struct lchown_args { char *path; int uid; int gid; }; #endif /* ARGSUSED */ int lchown(p, uap) struct proc *p; register struct lchown_args /* { syscallarg(char *) path; syscallarg(int) uid; syscallarg(int) gid; } */ *uap; { int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = setfown(p, nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid)); vrele(nd.ni_vp); return (error); } /* * Set ownership given a file descriptor. */ #ifndef _SYS_SYSPROTO_H_ struct fchown_args { int fd; int uid; int gid; }; #endif /* ARGSUSED */ int fchown(p, uap) struct proc *p; register struct fchown_args /* { syscallarg(int) fd; syscallarg(int) uid; syscallarg(int) gid; } */ *uap; { struct file *fp; int error; if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); return setfown(p, (struct vnode *)fp->f_data, SCARG(uap, uid), SCARG(uap, gid)); } static int setutimes(p, vp, tv, nullflag) struct proc *p; struct vnode *vp; struct timeval *tv; int nullflag; { int error; struct vattr vattr; VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); VATTR_NULL(&vattr); vattr.va_atime.tv_sec = tv[0].tv_sec; vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; vattr.va_mtime.tv_sec = tv[1].tv_sec; vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; if (nullflag) vattr.va_vaflags |= VA_UTIMES_NULL; error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); VOP_UNLOCK(vp, 0, p); return error; } /* * Set the access and modification times of a file. */ #ifndef _SYS_SYSPROTO_H_ struct utimes_args { char *path; struct timeval *tptr; }; #endif /* ARGSUSED */ int utimes(p, uap) struct proc *p; register struct utimes_args /* { syscallarg(char *) path; syscallarg(struct timeval *) tptr; } */ *uap; { struct timeval tv[2]; int error; struct nameidata nd; int nullflag; nullflag = 0; if (SCARG(uap, tptr) == NULL) { microtime(&tv[0]); tv[1] = tv[0]; nullflag = 1; } else if ((error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv, sizeof (tv))) != 0) return (error); NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = setutimes(p, nd.ni_vp, tv, nullflag); vrele(nd.ni_vp); return (error); } /* * Set the access and modification times of a file. */ #ifndef _SYS_SYSPROTO_H_ struct lutimes_args { char *path; struct timeval *tptr; }; #endif /* ARGSUSED */ int lutimes(p, uap) struct proc *p; register struct lutimes_args /* { syscallarg(char *) path; syscallarg(struct timeval *) tptr; } */ *uap; { struct timeval tv[2]; int error; struct nameidata nd; int nullflag; nullflag = 0; if (SCARG(uap, tptr) == NULL) { microtime(&tv[0]); tv[1] = tv[0]; nullflag = 1; } else if ((error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv, sizeof (tv))) != 0) return (error); NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = setutimes(p, nd.ni_vp, tv, nullflag); vrele(nd.ni_vp); return (error); } /* * Set the access and modification times of a file. */ #ifndef _SYS_SYSPROTO_H_ struct futimes_args { int fd; struct timeval *tptr; }; #endif /* ARGSUSED */ int futimes(p, uap) struct proc *p; register struct futimes_args /* { syscallarg(int ) fd; syscallarg(struct timeval *) tptr; } */ *uap; { struct timeval tv[2]; struct file *fp; int error; int nullflag; nullflag = 0; if (SCARG(uap, tptr) == NULL) { microtime(&tv[0]); tv[1] = tv[0]; nullflag = 1; } else if ((error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv, sizeof (tv))) != 0) return (error); if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); return setutimes(p, (struct vnode *)fp->f_data, tv, nullflag); } /* * Truncate a file given its path name. */ #ifndef _SYS_SYSPROTO_H_ struct truncate_args { char *path; int pad; off_t length; }; #endif /* ARGSUSED */ int truncate(p, uap) struct proc *p; register struct truncate_args /* { syscallarg(char *) path; syscallarg(int) pad; syscallarg(off_t) length; } */ *uap; { register struct vnode *vp; struct vattr vattr; int error; struct nameidata nd; if (uap->length < 0) return(EINVAL); NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); if (vp->v_type == VDIR) error = EISDIR; else if ((error = vn_writechk(vp)) == 0 && (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { VATTR_NULL(&vattr); vattr.va_size = SCARG(uap, length); error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); } vput(vp); return (error); } /* * Truncate a file given a file descriptor. */ #ifndef _SYS_SYSPROTO_H_ struct ftruncate_args { int fd; int pad; off_t length; }; #endif /* ARGSUSED */ int ftruncate(p, uap) struct proc *p; register struct ftruncate_args /* { syscallarg(int) fd; syscallarg(int) pad; syscallarg(off_t) length; } */ *uap; { struct vattr vattr; struct vnode *vp; struct file *fp; int error; if (uap->length < 0) return(EINVAL); if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); if ((fp->f_flag & FWRITE) == 0) return (EINVAL); vp = (struct vnode *)fp->f_data; VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 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, p); } VOP_UNLOCK(vp, 0, p); return (error); } #if defined(COMPAT_43) || defined(COMPAT_SUNOS) /* * Truncate a file given its path name. */ #ifndef _SYS_SYSPROTO_H_ struct otruncate_args { char *path; long length; }; #endif /* ARGSUSED */ int otruncate(p, uap) struct proc *p; register struct otruncate_args /* { syscallarg(char *) path; syscallarg(long) length; } */ *uap; { struct truncate_args /* { syscallarg(char *) path; syscallarg(int) pad; syscallarg(off_t) length; } */ nuap; SCARG(&nuap, path) = SCARG(uap, path); SCARG(&nuap, length) = SCARG(uap, length); return (truncate(p, &nuap)); } /* * Truncate a file given a file descriptor. */ #ifndef _SYS_SYSPROTO_H_ struct oftruncate_args { int fd; long length; }; #endif /* ARGSUSED */ int oftruncate(p, uap) struct proc *p; register struct oftruncate_args /* { syscallarg(int) fd; syscallarg(long) length; } */ *uap; { struct ftruncate_args /* { syscallarg(int) fd; syscallarg(int) pad; syscallarg(off_t) length; } */ nuap; SCARG(&nuap, fd) = SCARG(uap, fd); SCARG(&nuap, length) = SCARG(uap, length); return (ftruncate(p, &nuap)); } #endif /* COMPAT_43 || COMPAT_SUNOS */ /* * Sync an open file. */ #ifndef _SYS_SYSPROTO_H_ struct fsync_args { int fd; }; #endif /* ARGSUSED */ int fsync(p, uap) struct proc *p; struct fsync_args /* { syscallarg(int) fd; } */ *uap; { register struct vnode *vp; struct file *fp; int error; if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); vp = (struct vnode *)fp->f_data; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); if (vp->v_object) vm_object_page_clean(vp->v_object, 0, 0, 0); if ((error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p)) == 0 && vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP) && bioops.io_fsync) error = (*bioops.io_fsync)(vp); VOP_UNLOCK(vp, 0, p); return (error); } /* * Rename files. Source and destination must either both be directories, * or both not be directories. If target is a directory, it must be empty. */ #ifndef _SYS_SYSPROTO_H_ struct rename_args { char *from; char *to; }; #endif /* ARGSUSED */ int rename(p, uap) struct proc *p; register struct rename_args /* { syscallarg(char *) from; syscallarg(char *) to; } */ *uap; { register struct vnode *tvp, *fvp, *tdvp; struct nameidata fromnd, tond; int error; NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, SCARG(uap, from), p); if ((error = namei(&fromnd)) != 0) return (error); fvp = fromnd.ni_vp; NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | NOOBJ, UIO_USERSPACE, SCARG(uap, to), p); if (fromnd.ni_vp->v_type == VDIR) tond.ni_cnd.cn_flags |= WILLBEDIR; if ((error = namei(&tond)) != 0) { /* Translate error code for rename("dir1", "dir2/."). */ if (error == EISDIR && fvp->v_type == VDIR) error = EINVAL; 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; /* * If source is the same as the destination (that is the * same inode number with the same name in the same directory), * then there is nothing to do. */ if (fvp == tvp && fromnd.ni_dvp == tdvp && fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && !bcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, fromnd.ni_cnd.cn_namelen)) error = -1; out: if (!error) { VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); if (fromnd.ni_dvp != tdvp) { VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); } if (tvp) { VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); } error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); } else { VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); if (tdvp == tvp) vrele(tdvp); else vput(tdvp); if (tvp) vput(tvp); VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); vrele(fromnd.ni_dvp); vrele(fvp); } vrele(tond.ni_startdir); ASSERT_VOP_UNLOCKED(fromnd.ni_dvp, "rename"); ASSERT_VOP_UNLOCKED(fromnd.ni_vp, "rename"); ASSERT_VOP_UNLOCKED(tond.ni_dvp, "rename"); ASSERT_VOP_UNLOCKED(tond.ni_vp, "rename"); zfree(namei_zone, tond.ni_cnd.cn_pnbuf); out1: if (fromnd.ni_startdir) vrele(fromnd.ni_startdir); zfree(namei_zone, fromnd.ni_cnd.cn_pnbuf); if (error == -1) return (0); return (error); } /* * Make a directory file. */ #ifndef _SYS_SYSPROTO_H_ struct mkdir_args { char *path; int mode; }; #endif /* ARGSUSED */ int mkdir(p, uap) struct proc *p; register struct mkdir_args /* { syscallarg(char *) path; syscallarg(int) mode; } */ *uap; { register struct vnode *vp; struct vattr vattr; int error; struct nameidata nd; NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); nd.ni_cnd.cn_flags |= WILLBEDIR; 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; vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask; VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); vput(nd.ni_dvp); if (!error) vput(nd.ni_vp); ASSERT_VOP_UNLOCKED(nd.ni_dvp, "mkdir"); ASSERT_VOP_UNLOCKED(nd.ni_vp, "mkdir"); return (error); } /* * Remove a directory file. */ #ifndef _SYS_SYSPROTO_H_ struct rmdir_args { char *path; }; #endif /* ARGSUSED */ int rmdir(p, uap) struct proc *p; struct rmdir_args /* { syscallarg(char *) path; } */ *uap; { register struct vnode *vp; int error; struct nameidata nd; NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); 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_flag & VROOT) error = EBUSY; out: if (!error) { VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); } 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 != NULLVP) vput(vp); ASSERT_VOP_UNLOCKED(nd.ni_dvp, "rmdir"); ASSERT_VOP_UNLOCKED(nd.ni_vp, "rmdir"); return (error); } #ifdef COMPAT_43 /* * Read a block of directory entries in a file system independent format. */ #ifndef _SYS_SYSPROTO_H_ struct ogetdirentries_args { int fd; char *buf; u_int count; long *basep; }; #endif int ogetdirentries(p, uap) struct proc *p; register struct ogetdirentries_args /* { syscallarg(int) fd; syscallarg(char *) buf; syscallarg(u_int) count; syscallarg(long *) basep; } */ *uap; { struct vnode *vp; struct file *fp; struct uio auio, kuio; struct iovec aiov, kiov; struct dirent *dp, *edp; caddr_t dirbuf; int error, eofflag, readcnt; long loff; if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); if ((fp->f_flag & FREAD) == 0) return (EBADF); vp = (struct vnode *)fp->f_data; unionread: if (vp->v_type != VDIR) return (EINVAL); aiov.iov_base = SCARG(uap, buf); aiov.iov_len = SCARG(uap, count); auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_rw = UIO_READ; auio.uio_segflg = UIO_USERSPACE; auio.uio_procp = p; auio.uio_resid = SCARG(uap, count); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); loff = auio.uio_offset = fp->f_offset; # if (BYTE_ORDER != LITTLE_ENDIAN) if (vp->v_mount->mnt_maxsymlinklen <= 0) { error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL); fp->f_offset = auio.uio_offset; } else # endif { kuio = auio; kuio.uio_iov = &kiov; kuio.uio_segflg = UIO_SYSSPACE; kiov.iov_len = SCARG(uap, count); MALLOC(dirbuf, caddr_t, SCARG(uap, count), M_TEMP, M_WAITOK); kiov.iov_base = dirbuf; error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag, NULL, NULL); fp->f_offset = kuio.uio_offset; if (error == 0) { readcnt = SCARG(uap, count) - kuio.uio_resid; edp = (struct dirent *)&dirbuf[readcnt]; for (dp = (struct dirent *)dirbuf; dp < edp; ) { # if (BYTE_ORDER == LITTLE_ENDIAN) /* * The expected low byte of * dp->d_namlen is our dp->d_type. * The high MBZ byte of dp->d_namlen * is our dp->d_namlen. */ dp->d_type = dp->d_namlen; dp->d_namlen = 0; # else /* * The dp->d_type is the high byte * of the expected dp->d_namlen, * so must be zero'ed. */ dp->d_type = 0; # endif if (dp->d_reclen > 0) { dp = (struct dirent *) ((char *)dp + dp->d_reclen); } else { error = EIO; break; } } if (dp >= edp) error = uiomove(dirbuf, readcnt, &auio); } FREE(dirbuf, M_TEMP); } VOP_UNLOCK(vp, 0, p); if (error) return (error); if (SCARG(uap, count) == auio.uio_resid) { if (union_dircheckp) { error = union_dircheckp(p, &vp, fp); if (error == -1) goto unionread; if (error) return (error); } if ((vp->v_flag & VROOT) && (vp->v_mount->mnt_flag & MNT_UNION)) { struct vnode *tvp = vp; vp = vp->v_mount->mnt_vnodecovered; VREF(vp); fp->f_data = (caddr_t) vp; fp->f_offset = 0; vrele(tvp); goto unionread; } } error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), sizeof(long)); p->p_retval[0] = SCARG(uap, count) - auio.uio_resid; return (error); } #endif /* COMPAT_43 */ /* * Read a block of directory entries in a file system independent format. */ #ifndef _SYS_SYSPROTO_H_ struct getdirentries_args { int fd; char *buf; u_int count; long *basep; }; #endif int getdirentries(p, uap) struct proc *p; register struct getdirentries_args /* { syscallarg(int) fd; syscallarg(char *) buf; syscallarg(u_int) count; syscallarg(long *) basep; } */ *uap; { struct vnode *vp; struct file *fp; struct uio auio; struct iovec aiov; long loff; int error, eofflag; if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); if ((fp->f_flag & FREAD) == 0) return (EBADF); vp = (struct vnode *)fp->f_data; unionread: if (vp->v_type != VDIR) return (EINVAL); aiov.iov_base = SCARG(uap, buf); aiov.iov_len = SCARG(uap, count); auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_rw = UIO_READ; auio.uio_segflg = UIO_USERSPACE; auio.uio_procp = p; auio.uio_resid = SCARG(uap, count); /* vn_lock(vp, LK_SHARED | LK_RETRY, p); */ vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); loff = auio.uio_offset = fp->f_offset; error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL); fp->f_offset = auio.uio_offset; VOP_UNLOCK(vp, 0, p); if (error) return (error); if (SCARG(uap, count) == auio.uio_resid) { if (union_dircheckp) { error = union_dircheckp(p, &vp, fp); if (error == -1) goto unionread; if (error) return (error); } if ((vp->v_flag & VROOT) && (vp->v_mount->mnt_flag & MNT_UNION)) { struct vnode *tvp = vp; vp = vp->v_mount->mnt_vnodecovered; VREF(vp); fp->f_data = (caddr_t) vp; fp->f_offset = 0; vrele(tvp); goto unionread; } } if (SCARG(uap, basep) != NULL) { error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep), sizeof(long)); } p->p_retval[0] = SCARG(uap, count) - auio.uio_resid; return (error); } #ifndef _SYS_SYSPROTO_H_ struct getdents_args { int fd; char *buf; size_t count; }; #endif int getdents(p, uap) struct proc *p; register struct getdents_args /* { syscallarg(int) fd; syscallarg(char *) buf; syscallarg(u_int) count; } */ *uap; { struct getdirentries_args ap; ap.fd = uap->fd; ap.buf = uap->buf; ap.count = uap->count; ap.basep = NULL; return getdirentries(p, &ap); } /* * Set the mode mask for creation of filesystem nodes. */ #ifndef _SYS_SYSPROTO_H_ struct umask_args { int newmask; }; #endif int umask(p, uap) struct proc *p; struct umask_args /* { syscallarg(int) newmask; } */ *uap; { register struct filedesc *fdp; fdp = p->p_fd; p->p_retval[0] = fdp->fd_cmask; fdp->fd_cmask = SCARG(uap, newmask) & ALLPERMS; return (0); } /* * Void all references to file by ripping underlying filesystem * away from vnode. */ #ifndef _SYS_SYSPROTO_H_ struct revoke_args { char *path; }; #endif /* ARGSUSED */ int revoke(p, uap) struct proc *p; register struct revoke_args /* { syscallarg(char *) path; } */ *uap; { register struct vnode *vp; struct vattr vattr; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if (vp->v_type != VCHR && vp->v_type != VBLK) { error = EINVAL; goto out; } if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) goto out; if (p->p_ucred->cr_uid != vattr.va_uid && (error = suser_xxx(0, p, PRISON_ROOT))) goto out; if (vp->v_usecount > 1 || (vp->v_flag & VALIASED)) VOP_REVOKE(vp, REVOKEALL); out: vrele(vp); return (error); } /* * Convert a user file descriptor to a kernel file entry. */ int getvnode(fdp, fd, fpp) struct filedesc *fdp; int fd; struct file **fpp; { struct file *fp; if ((u_int)fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) return (EBADF); if (fp->f_type != DTYPE_VNODE && fp->f_type != DTYPE_FIFO) return (EINVAL); *fpp = fp; return (0); } #ifndef _SYS_SYSPROTO_H_ struct __getcwd_args { u_char *buf; u_int buflen; }; #endif SYSCTL_DECL(_vfs_cache); #define STATNODE(mode, name, var) \ SYSCTL_INT(_vfs_cache, OID_AUTO, name, mode, var, 0, ""); static int disablecwd; SYSCTL_INT(_debug, OID_AUTO, disablecwd, CTLFLAG_RW, &disablecwd, 0, ""); static u_long numcwdcalls; STATNODE(CTLFLAG_RD, numcwdcalls, &numcwdcalls); static u_long numcwdfail1; STATNODE(CTLFLAG_RD, numcwdfail1, &numcwdfail1); static u_long numcwdfail2; STATNODE(CTLFLAG_RD, numcwdfail2, &numcwdfail2); static u_long numcwdfail3; STATNODE(CTLFLAG_RD, numcwdfail3, &numcwdfail3); static u_long numcwdfail4; STATNODE(CTLFLAG_RD, numcwdfail4, &numcwdfail4); static u_long numcwdfound; STATNODE(CTLFLAG_RD, numcwdfound, &numcwdfound); int __getcwd(p, uap) struct proc *p; struct __getcwd_args *uap; { char *bp, *buf; int error, i, slash_prefixed; struct filedesc *fdp; struct namecache *ncp; struct vnode *vp; numcwdcalls++; if (disablecwd) return (ENODEV); if (uap->buflen < 2) return (EINVAL); if (uap->buflen > MAXPATHLEN) uap->buflen = MAXPATHLEN; buf = bp = malloc(uap->buflen, M_TEMP, M_WAITOK); bp += uap->buflen - 1; *bp = '\0'; fdp = p->p_fd; slash_prefixed = 0; for (vp = fdp->fd_cdir; vp != fdp->fd_rdir && vp != rootvnode;) { if (vp->v_flag & VROOT) { vp = vp->v_mount->mnt_vnodecovered; continue; } if (vp->v_dd->v_id != vp->v_ddid) { numcwdfail1++; free(buf, M_TEMP); return (ENOTDIR); } ncp = TAILQ_FIRST(&vp->v_cache_dst); if (!ncp) { numcwdfail2++; free(buf, M_TEMP); return (ENOENT); } if (ncp->nc_dvp != vp->v_dd) { numcwdfail3++; free(buf, M_TEMP); return (EBADF); } for (i = ncp->nc_nlen - 1; i >= 0; i--) { if (bp == buf) { numcwdfail4++; free(buf, M_TEMP); return (ENOMEM); } *--bp = ncp->nc_name[i]; } if (bp == buf) { numcwdfail4++; free(buf, M_TEMP); return (ENOMEM); } *--bp = '/'; slash_prefixed = 1; vp = vp->v_dd; } if (!slash_prefixed) { if (bp == buf) { numcwdfail4++; free(buf, M_TEMP); return (ENOMEM); } *--bp = '/'; } numcwdfound++; error = copyout(bp, uap->buf, strlen(bp) + 1); free(buf, M_TEMP); return (error); }