/*- * 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. * 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 */ #include __FBSDID("$FreeBSD$"); #include "opt_compat.h" #include "opt_kdtrace.h" #include "opt_ktrace.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 #include #include #include #include #include #ifdef KTRACE #include #endif #include #include #include #include #include #include #include SDT_PROVIDER_DEFINE(vfs); SDT_PROBE_DEFINE(vfs, , stat, mode); SDT_PROBE_ARGTYPE(vfs, , stat, mode, 0, "char *"); SDT_PROBE_ARGTYPE(vfs, , stat, mode, 1, "int"); SDT_PROBE_DEFINE(vfs, , stat, reg); SDT_PROBE_ARGTYPE(vfs, , stat, reg, 0, "char *"); SDT_PROBE_ARGTYPE(vfs, , stat, reg, 1, "int"); static int chroot_refuse_vdir_fds(struct filedesc *fdp); static int getutimes(const struct timeval *, enum uio_seg, struct timespec *); static int setfown(struct thread *td, struct vnode *, uid_t, gid_t); static int setfmode(struct thread *td, struct vnode *, int); static int setfflags(struct thread *td, struct vnode *, int); static int setutimes(struct thread *td, struct vnode *, const struct timespec *, int, int); static int vn_access(struct vnode *vp, int user_flags, struct ucred *cred, struct thread *td); /* * The module initialization routine for POSIX asynchronous I/O will * set this to the version of AIO that it implements. (Zero means * that it is not implemented.) This value is used here by pathconf() * and in kern_descrip.c by fpathconf(). */ int async_io_version; #ifdef DEBUG static int syncprt = 0; SYSCTL_INT(_debug, OID_AUTO, syncprt, CTLFLAG_RW, &syncprt, 0, ""); #endif /* * Sync each mounted filesystem. */ #ifndef _SYS_SYSPROTO_H_ struct sync_args { int dummy; }; #endif /* ARGSUSED */ int sync(td, uap) struct thread *td; struct sync_args *uap; { struct mount *mp, *nmp; int vfslocked; mtx_lock(&mountlist_mtx); for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { nmp = TAILQ_NEXT(mp, mnt_list); continue; } vfslocked = VFS_LOCK_GIANT(mp); if ((mp->mnt_flag & MNT_RDONLY) == 0 && vn_start_write(NULL, &mp, V_NOWAIT) == 0) { MNT_ILOCK(mp); mp->mnt_noasync++; mp->mnt_kern_flag &= ~MNTK_ASYNC; MNT_IUNLOCK(mp); vfs_msync(mp, MNT_NOWAIT); VFS_SYNC(mp, MNT_NOWAIT); MNT_ILOCK(mp); mp->mnt_noasync--; if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) mp->mnt_kern_flag |= MNTK_ASYNC; MNT_IUNLOCK(mp); vn_finished_write(mp); } VFS_UNLOCK_GIANT(vfslocked); mtx_lock(&mountlist_mtx); nmp = TAILQ_NEXT(mp, mnt_list); vfs_unbusy(mp); } mtx_unlock(&mountlist_mtx); return (0); } /* * Change filesystem quotas. */ #ifndef _SYS_SYSPROTO_H_ struct quotactl_args { char *path; int cmd; int uid; caddr_t arg; }; #endif int quotactl(td, uap) struct thread *td; register struct quotactl_args /* { char *path; int cmd; int uid; caddr_t arg; } */ *uap; { struct mount *mp; int vfslocked; int error; struct nameidata nd; AUDIT_ARG_CMD(uap->cmd); AUDIT_ARG_UID(uap->uid); if (!prison_allow(td->td_ucred, PR_ALLOW_QUOTAS)) return (EPERM); NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, UIO_USERSPACE, uap->path, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); NDFREE(&nd, NDF_ONLY_PNBUF); mp = nd.ni_vp->v_mount; vfs_ref(mp); vput(nd.ni_vp); error = vfs_busy(mp, 0); vfs_rel(mp); if (error) { VFS_UNLOCK_GIANT(vfslocked); return (error); } error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg); vfs_unbusy(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Used by statfs conversion routines to scale the block size up if * necessary so that all of the block counts are <= 'max_size'. Note * that 'max_size' should be a bitmask, i.e. 2^n - 1 for some non-zero * value of 'n'. */ void statfs_scale_blocks(struct statfs *sf, long max_size) { uint64_t count; int shift; KASSERT(powerof2(max_size + 1), ("%s: invalid max_size", __func__)); /* * Attempt to scale the block counts to give a more accurate * overview to userland of the ratio of free space to used * space. To do this, find the largest block count and compute * a divisor that lets it fit into a signed integer <= max_size. */ if (sf->f_bavail < 0) count = -sf->f_bavail; else count = sf->f_bavail; count = MAX(sf->f_blocks, MAX(sf->f_bfree, count)); if (count <= max_size) return; count >>= flsl(max_size); shift = 0; while (count > 0) { shift++; count >>=1; } sf->f_bsize <<= shift; sf->f_blocks >>= shift; sf->f_bfree >>= shift; sf->f_bavail >>= shift; } /* * Get filesystem statistics. */ #ifndef _SYS_SYSPROTO_H_ struct statfs_args { char *path; struct statfs *buf; }; #endif int statfs(td, uap) struct thread *td; register struct statfs_args /* { char *path; struct statfs *buf; } */ *uap; { struct statfs sf; int error; error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf); if (error == 0) error = copyout(&sf, uap->buf, sizeof(sf)); return (error); } int kern_statfs(struct thread *td, char *path, enum uio_seg pathseg, struct statfs *buf) { struct mount *mp; struct statfs *sp, sb; int vfslocked; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE | AUDITVNODE1, pathseg, path, td); error = namei(&nd); if (error) return (error); vfslocked = NDHASGIANT(&nd); mp = nd.ni_vp->v_mount; vfs_ref(mp); NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_vp); error = vfs_busy(mp, 0); vfs_rel(mp); if (error) { VFS_UNLOCK_GIANT(vfslocked); return (error); } #ifdef MAC error = mac_mount_check_stat(td->td_ucred, mp); if (error) goto out; #endif /* * Set these in case the underlying filesystem fails to do so. */ sp = &mp->mnt_stat; sp->f_version = STATFS_VERSION; sp->f_namemax = NAME_MAX; sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; error = VFS_STATFS(mp, sp); if (error) goto out; if (priv_check(td, PRIV_VFS_GENERATION)) { bcopy(sp, &sb, sizeof(sb)); sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; prison_enforce_statfs(td->td_ucred, mp, &sb); sp = &sb; } *buf = *sp; out: vfs_unbusy(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Get filesystem statistics. */ #ifndef _SYS_SYSPROTO_H_ struct fstatfs_args { int fd; struct statfs *buf; }; #endif int fstatfs(td, uap) struct thread *td; register struct fstatfs_args /* { int fd; struct statfs *buf; } */ *uap; { struct statfs sf; int error; error = kern_fstatfs(td, uap->fd, &sf); if (error == 0) error = copyout(&sf, uap->buf, sizeof(sf)); return (error); } int kern_fstatfs(struct thread *td, int fd, struct statfs *buf) { struct file *fp; struct mount *mp; struct statfs *sp, sb; int vfslocked; struct vnode *vp; int error; AUDIT_ARG_FD(fd); error = getvnode(td->td_proc->p_fd, fd, &fp); if (error) return (error); vp = fp->f_vnode; vfslocked = VFS_LOCK_GIANT(vp->v_mount); vn_lock(vp, LK_SHARED | LK_RETRY); #ifdef AUDIT AUDIT_ARG_VNODE1(vp); #endif mp = vp->v_mount; if (mp) vfs_ref(mp); VOP_UNLOCK(vp, 0); fdrop(fp, td); if (mp == NULL) { error = EBADF; goto out; } error = vfs_busy(mp, 0); vfs_rel(mp); if (error) { VFS_UNLOCK_GIANT(vfslocked); return (error); } #ifdef MAC error = mac_mount_check_stat(td->td_ucred, mp); if (error) goto out; #endif /* * Set these in case the underlying filesystem fails to do so. */ sp = &mp->mnt_stat; sp->f_version = STATFS_VERSION; sp->f_namemax = NAME_MAX; sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; error = VFS_STATFS(mp, sp); if (error) goto out; if (priv_check(td, PRIV_VFS_GENERATION)) { bcopy(sp, &sb, sizeof(sb)); sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; prison_enforce_statfs(td->td_ucred, mp, &sb); sp = &sb; } *buf = *sp; out: if (mp) vfs_unbusy(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Get statistics on all filesystems. */ #ifndef _SYS_SYSPROTO_H_ struct getfsstat_args { struct statfs *buf; long bufsize; int flags; }; #endif int getfsstat(td, uap) struct thread *td; register struct getfsstat_args /* { struct statfs *buf; long bufsize; int flags; } */ *uap; { return (kern_getfsstat(td, &uap->buf, uap->bufsize, UIO_USERSPACE, uap->flags)); } /* * If (bufsize > 0 && bufseg == UIO_SYSSPACE) * The caller is responsible for freeing memory which will be allocated * in '*buf'. */ int kern_getfsstat(struct thread *td, struct statfs **buf, size_t bufsize, enum uio_seg bufseg, int flags) { struct mount *mp, *nmp; struct statfs *sfsp, *sp, sb; size_t count, maxcount; int vfslocked; int error; maxcount = bufsize / sizeof(struct statfs); if (bufsize == 0) sfsp = NULL; else if (bufseg == UIO_USERSPACE) sfsp = *buf; else /* if (bufseg == UIO_SYSSPACE) */ { count = 0; mtx_lock(&mountlist_mtx); TAILQ_FOREACH(mp, &mountlist, mnt_list) { count++; } mtx_unlock(&mountlist_mtx); if (maxcount > count) maxcount = count; sfsp = *buf = malloc(maxcount * sizeof(struct statfs), M_TEMP, M_WAITOK); } count = 0; mtx_lock(&mountlist_mtx); for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { if (prison_canseemount(td->td_ucred, mp) != 0) { nmp = TAILQ_NEXT(mp, mnt_list); continue; } #ifdef MAC if (mac_mount_check_stat(td->td_ucred, mp) != 0) { nmp = TAILQ_NEXT(mp, mnt_list); continue; } #endif if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { nmp = TAILQ_NEXT(mp, mnt_list); continue; } vfslocked = VFS_LOCK_GIANT(mp); if (sfsp && count < maxcount) { sp = &mp->mnt_stat; /* * Set these in case the underlying filesystem * fails to do so. */ sp->f_version = STATFS_VERSION; sp->f_namemax = NAME_MAX; sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; /* * If MNT_NOWAIT or MNT_LAZY is specified, do not * refresh the fsstat cache. MNT_NOWAIT or MNT_LAZY * overrides MNT_WAIT. */ if (((flags & (MNT_LAZY|MNT_NOWAIT)) == 0 || (flags & MNT_WAIT)) && (error = VFS_STATFS(mp, sp))) { VFS_UNLOCK_GIANT(vfslocked); mtx_lock(&mountlist_mtx); nmp = TAILQ_NEXT(mp, mnt_list); vfs_unbusy(mp); continue; } if (priv_check(td, PRIV_VFS_GENERATION)) { bcopy(sp, &sb, sizeof(sb)); sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0; prison_enforce_statfs(td->td_ucred, mp, &sb); sp = &sb; } if (bufseg == UIO_SYSSPACE) bcopy(sp, sfsp, sizeof(*sp)); else /* if (bufseg == UIO_USERSPACE) */ { error = copyout(sp, sfsp, sizeof(*sp)); if (error) { vfs_unbusy(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } } sfsp++; } VFS_UNLOCK_GIANT(vfslocked); count++; mtx_lock(&mountlist_mtx); nmp = TAILQ_NEXT(mp, mnt_list); vfs_unbusy(mp); } mtx_unlock(&mountlist_mtx); if (sfsp && count > maxcount) td->td_retval[0] = maxcount; else td->td_retval[0] = count; return (0); } #ifdef COMPAT_FREEBSD4 /* * Get old format filesystem statistics. */ static void cvtstatfs(struct statfs *, struct ostatfs *); #ifndef _SYS_SYSPROTO_H_ struct freebsd4_statfs_args { char *path; struct ostatfs *buf; }; #endif int freebsd4_statfs(td, uap) struct thread *td; struct freebsd4_statfs_args /* { char *path; struct ostatfs *buf; } */ *uap; { struct ostatfs osb; struct statfs sf; int error; error = kern_statfs(td, uap->path, UIO_USERSPACE, &sf); if (error) return (error); cvtstatfs(&sf, &osb); return (copyout(&osb, uap->buf, sizeof(osb))); } /* * Get filesystem statistics. */ #ifndef _SYS_SYSPROTO_H_ struct freebsd4_fstatfs_args { int fd; struct ostatfs *buf; }; #endif int freebsd4_fstatfs(td, uap) struct thread *td; struct freebsd4_fstatfs_args /* { int fd; struct ostatfs *buf; } */ *uap; { struct ostatfs osb; struct statfs sf; int error; error = kern_fstatfs(td, uap->fd, &sf); if (error) return (error); cvtstatfs(&sf, &osb); return (copyout(&osb, uap->buf, sizeof(osb))); } /* * Get statistics on all filesystems. */ #ifndef _SYS_SYSPROTO_H_ struct freebsd4_getfsstat_args { struct ostatfs *buf; long bufsize; int flags; }; #endif int freebsd4_getfsstat(td, uap) struct thread *td; register struct freebsd4_getfsstat_args /* { struct ostatfs *buf; long bufsize; int flags; } */ *uap; { struct statfs *buf, *sp; struct ostatfs osb; size_t count, size; int error; count = uap->bufsize / sizeof(struct ostatfs); size = count * sizeof(struct statfs); error = kern_getfsstat(td, &buf, size, UIO_SYSSPACE, uap->flags); if (size > 0) { count = td->td_retval[0]; sp = buf; while (count > 0 && error == 0) { cvtstatfs(sp, &osb); error = copyout(&osb, uap->buf, sizeof(osb)); sp++; uap->buf++; count--; } free(buf, M_TEMP); } return (error); } /* * Implement fstatfs() for (NFS) file handles. */ #ifndef _SYS_SYSPROTO_H_ struct freebsd4_fhstatfs_args { struct fhandle *u_fhp; struct ostatfs *buf; }; #endif int freebsd4_fhstatfs(td, uap) struct thread *td; struct freebsd4_fhstatfs_args /* { struct fhandle *u_fhp; struct ostatfs *buf; } */ *uap; { struct ostatfs osb; struct statfs sf; fhandle_t fh; int error; error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); if (error) return (error); error = kern_fhstatfs(td, fh, &sf); if (error) return (error); cvtstatfs(&sf, &osb); return (copyout(&osb, uap->buf, sizeof(osb))); } /* * Convert a new format statfs structure to an old format statfs structure. */ static void cvtstatfs(nsp, osp) struct statfs *nsp; struct ostatfs *osp; { statfs_scale_blocks(nsp, LONG_MAX); bzero(osp, sizeof(*osp)); osp->f_bsize = nsp->f_bsize; osp->f_iosize = MIN(nsp->f_iosize, LONG_MAX); osp->f_blocks = nsp->f_blocks; osp->f_bfree = nsp->f_bfree; osp->f_bavail = nsp->f_bavail; osp->f_files = MIN(nsp->f_files, LONG_MAX); osp->f_ffree = MIN(nsp->f_ffree, LONG_MAX); osp->f_owner = nsp->f_owner; osp->f_type = nsp->f_type; osp->f_flags = nsp->f_flags; osp->f_syncwrites = MIN(nsp->f_syncwrites, LONG_MAX); osp->f_asyncwrites = MIN(nsp->f_asyncwrites, LONG_MAX); osp->f_syncreads = MIN(nsp->f_syncreads, LONG_MAX); osp->f_asyncreads = MIN(nsp->f_asyncreads, LONG_MAX); strlcpy(osp->f_fstypename, nsp->f_fstypename, MIN(MFSNAMELEN, OMFSNAMELEN)); strlcpy(osp->f_mntonname, nsp->f_mntonname, MIN(MNAMELEN, OMNAMELEN)); strlcpy(osp->f_mntfromname, nsp->f_mntfromname, MIN(MNAMELEN, OMNAMELEN)); osp->f_fsid = nsp->f_fsid; } #endif /* COMPAT_FREEBSD4 */ /* * Change current working directory to a given file descriptor. */ #ifndef _SYS_SYSPROTO_H_ struct fchdir_args { int fd; }; #endif int fchdir(td, uap) struct thread *td; struct fchdir_args /* { int fd; } */ *uap; { register struct filedesc *fdp = td->td_proc->p_fd; struct vnode *vp, *tdp, *vpold; struct mount *mp; struct file *fp; int vfslocked; int error; AUDIT_ARG_FD(uap->fd); if ((error = getvnode(fdp, uap->fd, &fp)) != 0) return (error); vp = fp->f_vnode; VREF(vp); fdrop(fp, td); vfslocked = VFS_LOCK_GIANT(vp->v_mount); vn_lock(vp, LK_SHARED | LK_RETRY); AUDIT_ARG_VNODE1(vp); error = change_dir(vp, td); while (!error && (mp = vp->v_mountedhere) != NULL) { int tvfslocked; if (vfs_busy(mp, 0)) continue; tvfslocked = VFS_LOCK_GIANT(mp); error = VFS_ROOT(mp, LK_SHARED, &tdp); vfs_unbusy(mp); if (error) { VFS_UNLOCK_GIANT(tvfslocked); break; } vput(vp); VFS_UNLOCK_GIANT(vfslocked); vp = tdp; vfslocked = tvfslocked; } if (error) { vput(vp); VFS_UNLOCK_GIANT(vfslocked); return (error); } VOP_UNLOCK(vp, 0); VFS_UNLOCK_GIANT(vfslocked); FILEDESC_XLOCK(fdp); vpold = fdp->fd_cdir; fdp->fd_cdir = vp; FILEDESC_XUNLOCK(fdp); vfslocked = VFS_LOCK_GIANT(vpold->v_mount); vrele(vpold); VFS_UNLOCK_GIANT(vfslocked); return (0); } /* * Change current working directory (``.''). */ #ifndef _SYS_SYSPROTO_H_ struct chdir_args { char *path; }; #endif int chdir(td, uap) struct thread *td; struct chdir_args /* { char *path; } */ *uap; { return (kern_chdir(td, uap->path, UIO_USERSPACE)); } int kern_chdir(struct thread *td, char *path, enum uio_seg pathseg) { register struct filedesc *fdp = td->td_proc->p_fd; int error; struct nameidata nd; struct vnode *vp; int vfslocked; NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1 | MPSAFE, pathseg, path, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); if ((error = change_dir(nd.ni_vp, td)) != 0) { vput(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); NDFREE(&nd, NDF_ONLY_PNBUF); return (error); } VOP_UNLOCK(nd.ni_vp, 0); VFS_UNLOCK_GIANT(vfslocked); NDFREE(&nd, NDF_ONLY_PNBUF); FILEDESC_XLOCK(fdp); vp = fdp->fd_cdir; fdp->fd_cdir = nd.ni_vp; FILEDESC_XUNLOCK(fdp); vfslocked = VFS_LOCK_GIANT(vp->v_mount); vrele(vp); VFS_UNLOCK_GIANT(vfslocked); 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 fd; FILEDESC_LOCK_ASSERT(fdp); for (fd = 0; fd < fdp->fd_nfiles ; fd++) { fp = fget_locked(fdp, fd); if (fp == NULL) continue; if (fp->f_type == DTYPE_VNODE) { vp = fp->f_vnode; if (vp->v_type == VDIR) 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 int chroot(td, uap) struct thread *td; struct chroot_args /* { char *path; } */ *uap; { int error; struct nameidata nd; int vfslocked; error = priv_check(td, PRIV_VFS_CHROOT); if (error) return (error); NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE | AUDITVNODE1, UIO_USERSPACE, uap->path, td); error = namei(&nd); if (error) goto error; vfslocked = NDHASGIANT(&nd); if ((error = change_dir(nd.ni_vp, td)) != 0) goto e_vunlock; #ifdef MAC if ((error = mac_vnode_check_chroot(td->td_ucred, nd.ni_vp))) goto e_vunlock; #endif VOP_UNLOCK(nd.ni_vp, 0); error = change_root(nd.ni_vp, td); vrele(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); NDFREE(&nd, NDF_ONLY_PNBUF); return (error); e_vunlock: vput(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); error: NDFREE(&nd, NDF_ONLY_PNBUF); return (error); } /* * Common routine for chroot and chdir. Callers must provide a locked vnode * instance. */ int change_dir(vp, td) struct vnode *vp; struct thread *td; { int error; ASSERT_VOP_LOCKED(vp, "change_dir(): vp not locked"); if (vp->v_type != VDIR) return (ENOTDIR); #ifdef MAC error = mac_vnode_check_chdir(td->td_ucred, vp); if (error) return (error); #endif error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td); return (error); } /* * Common routine for kern_chroot() and jail_attach(). The caller is * responsible for invoking priv_check() and mac_vnode_check_chroot() to * authorize this operation. */ int change_root(vp, td) struct vnode *vp; struct thread *td; { struct filedesc *fdp; struct vnode *oldvp; int vfslocked; int error; VFS_ASSERT_GIANT(vp->v_mount); fdp = td->td_proc->p_fd; FILEDESC_XLOCK(fdp); if (chroot_allow_open_directories == 0 || (chroot_allow_open_directories == 1 && fdp->fd_rdir != rootvnode)) { error = chroot_refuse_vdir_fds(fdp); if (error) { FILEDESC_XUNLOCK(fdp); return (error); } } oldvp = fdp->fd_rdir; fdp->fd_rdir = vp; VREF(fdp->fd_rdir); if (!fdp->fd_jdir) { fdp->fd_jdir = vp; VREF(fdp->fd_jdir); } FILEDESC_XUNLOCK(fdp); vfslocked = VFS_LOCK_GIANT(oldvp->v_mount); vrele(oldvp); VFS_UNLOCK_GIANT(vfslocked); return (0); } /* * 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(td, uap) struct thread *td; register struct open_args /* { char *path; int flags; int mode; } */ *uap; { return (kern_open(td, uap->path, UIO_USERSPACE, uap->flags, uap->mode)); } #ifndef _SYS_SYSPROTO_H_ struct openat_args { int fd; char *path; int flag; int mode; }; #endif int openat(struct thread *td, struct openat_args *uap) { return (kern_openat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, uap->mode)); } int kern_open(struct thread *td, char *path, enum uio_seg pathseg, int flags, int mode) { return (kern_openat(td, AT_FDCWD, path, pathseg, flags, mode)); } int kern_openat(struct thread *td, int fd, char *path, enum uio_seg pathseg, int flags, int mode) { struct proc *p = td->td_proc; struct filedesc *fdp = p->p_fd; struct file *fp; struct vnode *vp; int cmode; struct file *nfp; int type, indx, error; struct flock lf; struct nameidata nd; int vfslocked; AUDIT_ARG_FFLAGS(flags); AUDIT_ARG_MODE(mode); /* XXX: audit dirfd */ /* * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR may * be specified. */ if (flags & O_EXEC) { if (flags & O_ACCMODE) return (EINVAL); } else if ((flags & O_ACCMODE) == O_ACCMODE) return (EINVAL); else flags = FFLAGS(flags); error = falloc(td, &nfp, &indx); if (error) return (error); /* An extra reference on `nfp' has been held for us by falloc(). */ fp = nfp; /* Set the flags early so the finit in devfs can pick them up. */ fp->f_flag = flags & FMASK; cmode = ((mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT; NDINIT_AT(&nd, LOOKUP, FOLLOW | AUDITVNODE1 | MPSAFE, pathseg, path, fd, td); td->td_dupfd = -1; /* XXX check for fdopen */ error = vn_open(&nd, &flags, cmode, fp); if (error) { /* * If the vn_open replaced the method vector, something * wonderous happened deep below and we just pass it up * pretending we know what we do. */ if (error == ENXIO && fp->f_ops != &badfileops) { fdrop(fp, td); td->td_retval[0] = indx; return (0); } /* * handle special fdopen() case. bleh. dupfdopen() is * responsible for dropping the old contents of ofiles[indx] * if it succeeds. */ if ((error == ENODEV || error == ENXIO) && td->td_dupfd >= 0 && /* XXX from fdopen */ (error = dupfdopen(td, fdp, indx, td->td_dupfd, flags, error)) == 0) { td->td_retval[0] = indx; fdrop(fp, td); return (0); } /* * Clean up the descriptor, but only if another thread hadn't * replaced or closed it. */ fdclose(fdp, fp, indx, td); fdrop(fp, td); if (error == ERESTART) error = EINTR; return (error); } td->td_dupfd = 0; vfslocked = NDHASGIANT(&nd); NDFREE(&nd, NDF_ONLY_PNBUF); vp = nd.ni_vp; /* * Store the vnode, for any f_type. Typically, the vnode use * count is decremented by direct call to vn_closefile() for * files that switched type in the cdevsw fdopen() method. */ fp->f_vnode = vp; /* * If the file wasn't claimed by devfs bind it to the normal * vnode operations here. */ if (fp->f_ops == &badfileops) { KASSERT(vp->v_type != VFIFO, ("Unexpected fifo.")); fp->f_seqcount = 1; finit(fp, flags & FMASK, DTYPE_VNODE, vp, &vnops); } VOP_UNLOCK(vp, 0); if (fp->f_type == DTYPE_VNODE && (flags & (O_EXLOCK | O_SHLOCK)) != 0) { 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; if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) goto bad; atomic_set_int(&fp->f_flag, FHASLOCK); } if (flags & O_TRUNC) { error = fo_truncate(fp, 0, td->td_ucred, td); if (error) goto bad; } VFS_UNLOCK_GIANT(vfslocked); /* * Release our private reference, leaving the one associated with * the descriptor table intact. */ fdrop(fp, td); td->td_retval[0] = indx; return (0); bad: VFS_UNLOCK_GIANT(vfslocked); fdclose(fdp, fp, indx, td); fdrop(fp, td); return (error); } #ifdef COMPAT_43 /* * Create a file. */ #ifndef _SYS_SYSPROTO_H_ struct ocreat_args { char *path; int mode; }; #endif int ocreat(td, uap) struct thread *td; register struct ocreat_args /* { char *path; int mode; } */ *uap; { return (kern_open(td, uap->path, UIO_USERSPACE, O_WRONLY | O_CREAT | O_TRUNC, uap->mode)); } #endif /* COMPAT_43 */ /* * Create a special file. */ #ifndef _SYS_SYSPROTO_H_ struct mknod_args { char *path; int mode; int dev; }; #endif int mknod(td, uap) struct thread *td; register struct mknod_args /* { char *path; int mode; int dev; } */ *uap; { return (kern_mknod(td, uap->path, UIO_USERSPACE, uap->mode, uap->dev)); } #ifndef _SYS_SYSPROTO_H_ struct mknodat_args { int fd; char *path; mode_t mode; dev_t dev; }; #endif int mknodat(struct thread *td, struct mknodat_args *uap) { return (kern_mknodat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode, uap->dev)); } int kern_mknod(struct thread *td, char *path, enum uio_seg pathseg, int mode, int dev) { return (kern_mknodat(td, AT_FDCWD, path, pathseg, mode, dev)); } int kern_mknodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, int mode, int dev) { struct vnode *vp; struct mount *mp; struct vattr vattr; int error; int whiteout = 0; struct nameidata nd; int vfslocked; AUDIT_ARG_MODE(mode); AUDIT_ARG_DEV(dev); switch (mode & S_IFMT) { case S_IFCHR: case S_IFBLK: error = priv_check(td, PRIV_VFS_MKNOD_DEV); break; case S_IFMT: error = priv_check(td, PRIV_VFS_MKNOD_BAD); break; case S_IFWHT: error = priv_check(td, PRIV_VFS_MKNOD_WHT); break; case S_IFIFO: if (dev == 0) return (kern_mkfifoat(td, fd, path, pathseg, mode)); /* FALLTHROUGH */ default: error = EINVAL; break; } if (error) return (error); restart: bwillwrite(); NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1, pathseg, path, fd, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); vp = nd.ni_vp; if (vp != NULL) { NDFREE(&nd, NDF_ONLY_PNBUF); if (vp == nd.ni_dvp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(vp); VFS_UNLOCK_GIANT(vfslocked); return (EEXIST); } else { VATTR_NULL(&vattr); vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask; vattr.va_rdev = dev; whiteout = 0; 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: whiteout = 1; break; default: panic("kern_mknod: invalid mode"); } } if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_dvp); VFS_UNLOCK_GIANT(vfslocked); if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) return (error); goto restart; } #ifdef MAC if (error == 0 && !whiteout) error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, &vattr); #endif if (!error) { if (whiteout) error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); else { error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); if (error == 0) vput(nd.ni_vp); } } NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_dvp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Create a named pipe. */ #ifndef _SYS_SYSPROTO_H_ struct mkfifo_args { char *path; int mode; }; #endif int mkfifo(td, uap) struct thread *td; register struct mkfifo_args /* { char *path; int mode; } */ *uap; { return (kern_mkfifo(td, uap->path, UIO_USERSPACE, uap->mode)); } #ifndef _SYS_SYSPROTO_H_ struct mkfifoat_args { int fd; char *path; mode_t mode; }; #endif int mkfifoat(struct thread *td, struct mkfifoat_args *uap) { return (kern_mkfifoat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); } int kern_mkfifo(struct thread *td, char *path, enum uio_seg pathseg, int mode) { return (kern_mkfifoat(td, AT_FDCWD, path, pathseg, mode)); } int kern_mkfifoat(struct thread *td, int fd, char *path, enum uio_seg pathseg, int mode) { struct mount *mp; struct vattr vattr; int error; struct nameidata nd; int vfslocked; AUDIT_ARG_MODE(mode); restart: bwillwrite(); NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1, pathseg, path, fd, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); if (nd.ni_vp != NULL) { NDFREE(&nd, NDF_ONLY_PNBUF); if (nd.ni_vp == nd.ni_dvp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); return (EEXIST); } if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_dvp); VFS_UNLOCK_GIANT(vfslocked); if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) return (error); goto restart; } VATTR_NULL(&vattr); vattr.va_type = VFIFO; vattr.va_mode = (mode & ALLPERMS) & ~td->td_proc->p_fd->fd_cmask; #ifdef MAC error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, &vattr); if (error) goto out; #endif error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); if (error == 0) vput(nd.ni_vp); #ifdef MAC out: #endif vput(nd.ni_dvp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); NDFREE(&nd, NDF_ONLY_PNBUF); return (error); } /* * Make a hard file link. */ #ifndef _SYS_SYSPROTO_H_ struct link_args { char *path; char *link; }; #endif int link(td, uap) struct thread *td; register struct link_args /* { char *path; char *link; } */ *uap; { return (kern_link(td, uap->path, uap->link, UIO_USERSPACE)); } #ifndef _SYS_SYSPROTO_H_ struct linkat_args { int fd1; char *path1; int fd2; char *path2; int flag; }; #endif int linkat(struct thread *td, struct linkat_args *uap) { int flag; flag = uap->flag; if (flag & ~AT_SYMLINK_FOLLOW) return (EINVAL); return (kern_linkat(td, uap->fd1, uap->fd2, uap->path1, uap->path2, UIO_USERSPACE, (flag & AT_SYMLINK_FOLLOW) ? FOLLOW : NOFOLLOW)); } int hardlink_check_uid = 0; SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_uid, CTLFLAG_RW, &hardlink_check_uid, 0, "Unprivileged processes cannot create hard links to files owned by other " "users"); static int hardlink_check_gid = 0; SYSCTL_INT(_security_bsd, OID_AUTO, hardlink_check_gid, CTLFLAG_RW, &hardlink_check_gid, 0, "Unprivileged processes cannot create hard links to files owned by other " "groups"); static int can_hardlink(struct vnode *vp, struct ucred *cred) { struct vattr va; int error; if (!hardlink_check_uid && !hardlink_check_gid) return (0); error = VOP_GETATTR(vp, &va, cred); if (error != 0) return (error); if (hardlink_check_uid && cred->cr_uid != va.va_uid) { error = priv_check_cred(cred, PRIV_VFS_LINK, 0); if (error) return (error); } if (hardlink_check_gid && !groupmember(va.va_gid, cred)) { error = priv_check_cred(cred, PRIV_VFS_LINK, 0); if (error) return (error); } return (0); } int kern_link(struct thread *td, char *path, char *link, enum uio_seg segflg) { return (kern_linkat(td, AT_FDCWD, AT_FDCWD, path,link, segflg, FOLLOW)); } int kern_linkat(struct thread *td, int fd1, int fd2, char *path1, char *path2, enum uio_seg segflg, int follow) { struct vnode *vp; struct mount *mp; struct nameidata nd; int vfslocked; int lvfslocked; int error; bwillwrite(); NDINIT_AT(&nd, LOOKUP, follow | MPSAFE | AUDITVNODE1, segflg, path1, fd1, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); NDFREE(&nd, NDF_ONLY_PNBUF); vp = nd.ni_vp; if (vp->v_type == VDIR) { vrele(vp); VFS_UNLOCK_GIANT(vfslocked); return (EPERM); /* POSIX */ } if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { vrele(vp); VFS_UNLOCK_GIANT(vfslocked); return (error); } NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE2, segflg, path2, fd2, td); if ((error = namei(&nd)) == 0) { lvfslocked = NDHASGIANT(&nd); if (nd.ni_vp != NULL) { if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(nd.ni_vp); error = EEXIST; } else if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) == 0) { error = can_hardlink(vp, td->td_ucred); if (error == 0) #ifdef MAC error = mac_vnode_check_link(td->td_ucred, nd.ni_dvp, vp, &nd.ni_cnd); if (error == 0) #endif error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); VOP_UNLOCK(vp, 0); vput(nd.ni_dvp); } NDFREE(&nd, NDF_ONLY_PNBUF); VFS_UNLOCK_GIANT(lvfslocked); } vrele(vp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Make a symbolic link. */ #ifndef _SYS_SYSPROTO_H_ struct symlink_args { char *path; char *link; }; #endif int symlink(td, uap) struct thread *td; register struct symlink_args /* { char *path; char *link; } */ *uap; { return (kern_symlink(td, uap->path, uap->link, UIO_USERSPACE)); } #ifndef _SYS_SYSPROTO_H_ struct symlinkat_args { char *path; int fd; char *path2; }; #endif int symlinkat(struct thread *td, struct symlinkat_args *uap) { return (kern_symlinkat(td, uap->path1, uap->fd, uap->path2, UIO_USERSPACE)); } int kern_symlink(struct thread *td, char *path, char *link, enum uio_seg segflg) { return (kern_symlinkat(td, path, AT_FDCWD, link, segflg)); } int kern_symlinkat(struct thread *td, char *path1, int fd, char *path2, enum uio_seg segflg) { struct mount *mp; struct vattr vattr; char *syspath; int error; struct nameidata nd; int vfslocked; if (segflg == UIO_SYSSPACE) { syspath = path1; } else { syspath = uma_zalloc(namei_zone, M_WAITOK); if ((error = copyinstr(path1, syspath, MAXPATHLEN, NULL)) != 0) goto out; } AUDIT_ARG_TEXT(syspath); restart: bwillwrite(); NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1, segflg, path2, fd, td); if ((error = namei(&nd)) != 0) goto out; vfslocked = NDHASGIANT(&nd); if (nd.ni_vp) { NDFREE(&nd, NDF_ONLY_PNBUF); if (nd.ni_vp == nd.ni_dvp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); error = EEXIST; goto out; } if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_dvp); VFS_UNLOCK_GIANT(vfslocked); if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) goto out; goto restart; } VATTR_NULL(&vattr); vattr.va_mode = ACCESSPERMS &~ td->td_proc->p_fd->fd_cmask; #ifdef MAC vattr.va_type = VLNK; error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, &vattr); if (error) goto out2; #endif error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, syspath); if (error == 0) vput(nd.ni_vp); #ifdef MAC out2: #endif NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_dvp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); out: if (segflg != UIO_SYSSPACE) uma_zfree(namei_zone, syspath); return (error); } /* * Delete a whiteout from the filesystem. */ int undelete(td, uap) struct thread *td; register struct undelete_args /* { char *path; } */ *uap; { int error; struct mount *mp; struct nameidata nd; int vfslocked; restart: bwillwrite(); NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | MPSAFE | AUDITVNODE1, UIO_USERSPACE, uap->path, td); error = namei(&nd); if (error) return (error); vfslocked = NDHASGIANT(&nd); if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { NDFREE(&nd, NDF_ONLY_PNBUF); if (nd.ni_vp == nd.ni_dvp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); if (nd.ni_vp) vrele(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); return (EEXIST); } if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_dvp); VFS_UNLOCK_GIANT(vfslocked); if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) return (error); goto restart; } error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE); NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_dvp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Delete a name from the filesystem. */ #ifndef _SYS_SYSPROTO_H_ struct unlink_args { char *path; }; #endif int unlink(td, uap) struct thread *td; struct unlink_args /* { char *path; } */ *uap; { return (kern_unlink(td, uap->path, UIO_USERSPACE)); } #ifndef _SYS_SYSPROTO_H_ struct unlinkat_args { int fd; char *path; int flag; }; #endif int unlinkat(struct thread *td, struct unlinkat_args *uap) { int flag = uap->flag; int fd = uap->fd; char *path = uap->path; if (flag & ~AT_REMOVEDIR) return (EINVAL); if (flag & AT_REMOVEDIR) return (kern_rmdirat(td, fd, path, UIO_USERSPACE)); else return (kern_unlinkat(td, fd, path, UIO_USERSPACE)); } int kern_unlink(struct thread *td, char *path, enum uio_seg pathseg) { return (kern_unlinkat(td, AT_FDCWD, path, pathseg)); } int kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg) { struct mount *mp; struct vnode *vp; int error; struct nameidata nd; int vfslocked; restart: bwillwrite(); NDINIT_AT(&nd, DELETE, LOCKPARENT | LOCKLEAF | MPSAFE | AUDITVNODE1, pathseg, path, fd, td); if ((error = namei(&nd)) != 0) return (error == EINVAL ? EPERM : error); vfslocked = NDHASGIANT(&nd); vp = nd.ni_vp; 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_vflag & VV_ROOT) error = EBUSY; } if (error == 0) { if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_dvp); if (vp == nd.ni_dvp) vrele(vp); else vput(vp); VFS_UNLOCK_GIANT(vfslocked); if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) return (error); goto restart; } #ifdef MAC error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, &nd.ni_cnd); if (error) goto out; #endif error = VOP_REMOVE(nd.ni_dvp, vp, &nd.ni_cnd); #ifdef MAC out: #endif vn_finished_write(mp); } NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_dvp); if (vp == nd.ni_dvp) vrele(vp); else vput(vp); VFS_UNLOCK_GIANT(vfslocked); 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(td, uap) struct thread *td; register struct lseek_args /* { int fd; int pad; off_t offset; int whence; } */ *uap; { struct ucred *cred = td->td_ucred; struct file *fp; struct vnode *vp; struct vattr vattr; off_t offset, size; int error, noneg; int vfslocked; AUDIT_ARG_FD(uap->fd); if ((error = fget(td, uap->fd, &fp)) != 0) return (error); if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE)) { fdrop(fp, td); return (ESPIPE); } vp = fp->f_vnode; vfslocked = VFS_LOCK_GIANT(vp->v_mount); noneg = (vp->v_type != VCHR); offset = uap->offset; switch (uap->whence) { case L_INCR: if (noneg && (fp->f_offset < 0 || (offset > 0 && fp->f_offset > OFF_MAX - offset))) { error = EOVERFLOW; break; } offset += fp->f_offset; break; case L_XTND: vn_lock(vp, LK_SHARED | LK_RETRY); error = VOP_GETATTR(vp, &vattr, cred); VOP_UNLOCK(vp, 0); if (error) break; /* * If the file references a disk device, then fetch * the media size and use that to determine the ending * offset. */ if (vattr.va_size == 0 && vp->v_type == VCHR && fo_ioctl(fp, DIOCGMEDIASIZE, &size, cred, td) == 0) vattr.va_size = size; if (noneg && (vattr.va_size > OFF_MAX || (offset > 0 && vattr.va_size > OFF_MAX - offset))) { error = EOVERFLOW; break; } offset += vattr.va_size; break; case L_SET: break; case SEEK_DATA: error = fo_ioctl(fp, FIOSEEKDATA, &offset, cred, td); break; case SEEK_HOLE: error = fo_ioctl(fp, FIOSEEKHOLE, &offset, cred, td); break; default: error = EINVAL; } if (error == 0 && noneg && offset < 0) error = EINVAL; if (error != 0) goto drop; fp->f_offset = offset; *(off_t *)(td->td_retval) = fp->f_offset; drop: fdrop(fp, td); VFS_UNLOCK_GIANT(vfslocked); return (error); } #if defined(COMPAT_43) /* * Reposition read/write file offset. */ #ifndef _SYS_SYSPROTO_H_ struct olseek_args { int fd; long offset; int whence; }; #endif int olseek(td, uap) struct thread *td; register struct olseek_args /* { int fd; long offset; int whence; } */ *uap; { struct lseek_args /* { int fd; int pad; off_t offset; int whence; } */ nuap; nuap.fd = uap->fd; nuap.offset = uap->offset; nuap.whence = uap->whence; return (lseek(td, &nuap)); } #endif /* COMPAT_43 */ /* Version with the 'pad' argument */ int freebsd6_lseek(td, uap) struct thread *td; register struct freebsd6_lseek_args *uap; { struct lseek_args ouap; ouap.fd = uap->fd; ouap.offset = uap->offset; ouap.whence = uap->whence; return (lseek(td, &ouap)); } /* * Check access permissions using passed credentials. */ static int vn_access(vp, user_flags, cred, td) struct vnode *vp; int user_flags; struct ucred *cred; struct thread *td; { int error; accmode_t accmode; /* Flags == 0 means only check for existence. */ error = 0; if (user_flags) { accmode = 0; if (user_flags & R_OK) accmode |= VREAD; if (user_flags & W_OK) accmode |= VWRITE; if (user_flags & X_OK) accmode |= VEXEC; #ifdef MAC error = mac_vnode_check_access(cred, vp, accmode); if (error) return (error); #endif if ((accmode & VWRITE) == 0 || (error = vn_writechk(vp)) == 0) error = VOP_ACCESS(vp, accmode, cred, td); } return (error); } /* * Check access permissions using "real" credentials. */ #ifndef _SYS_SYSPROTO_H_ struct access_args { char *path; int flags; }; #endif int access(td, uap) struct thread *td; register struct access_args /* { char *path; int flags; } */ *uap; { return (kern_access(td, uap->path, UIO_USERSPACE, uap->flags)); } #ifndef _SYS_SYSPROTO_H_ struct faccessat_args { int dirfd; char *path; int mode; int flag; } #endif int faccessat(struct thread *td, struct faccessat_args *uap) { if (uap->flag & ~AT_EACCESS) return (EINVAL); return (kern_accessat(td, uap->fd, uap->path, UIO_USERSPACE, uap->flag, uap->mode)); } int kern_access(struct thread *td, char *path, enum uio_seg pathseg, int mode) { return (kern_accessat(td, AT_FDCWD, path, pathseg, 0, mode)); } int kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg, int flags, int mode) { struct ucred *cred, *tmpcred; struct vnode *vp; struct nameidata nd; int vfslocked; int error; /* * Create and modify a temporary credential instead of one that * is potentially shared. */ if (!(flags & AT_EACCESS)) { cred = td->td_ucred; tmpcred = crdup(cred); tmpcred->cr_uid = cred->cr_ruid; tmpcred->cr_groups[0] = cred->cr_rgid; td->td_ucred = tmpcred; } else cred = tmpcred = td->td_ucred; AUDIT_ARG_VALUE(mode); NDINIT_AT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE | AUDITVNODE1, pathseg, path, fd, td); if ((error = namei(&nd)) != 0) goto out1; vfslocked = NDHASGIANT(&nd); vp = nd.ni_vp; error = vn_access(vp, mode, tmpcred, td); NDFREE(&nd, NDF_ONLY_PNBUF); vput(vp); VFS_UNLOCK_GIANT(vfslocked); out1: if (!(flags & AT_EACCESS)) { td->td_ucred = cred; crfree(tmpcred); } return (error); } /* * Check access permissions using "effective" credentials. */ #ifndef _SYS_SYSPROTO_H_ struct eaccess_args { char *path; int flags; }; #endif int eaccess(td, uap) struct thread *td; register struct eaccess_args /* { char *path; int flags; } */ *uap; { return (kern_eaccess(td, uap->path, UIO_USERSPACE, uap->flags)); } int kern_eaccess(struct thread *td, char *path, enum uio_seg pathseg, int flags) { return (kern_accessat(td, AT_FDCWD, path, pathseg, AT_EACCESS, flags)); } #if defined(COMPAT_43) /* * Get file status; this version follows links. */ #ifndef _SYS_SYSPROTO_H_ struct ostat_args { char *path; struct ostat *ub; }; #endif int ostat(td, uap) struct thread *td; register struct ostat_args /* { char *path; struct ostat *ub; } */ *uap; { struct stat sb; struct ostat osb; int error; error = kern_stat(td, uap->path, UIO_USERSPACE, &sb); if (error) return (error); cvtstat(&sb, &osb); error = copyout(&osb, 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 int olstat(td, uap) struct thread *td; register struct olstat_args /* { char *path; struct ostat *ub; } */ *uap; { struct stat sb; struct ostat osb; int error; error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb); if (error) return (error); cvtstat(&sb, &osb); error = copyout(&osb, 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 */ /* * Get file status; this version follows links. */ #ifndef _SYS_SYSPROTO_H_ struct stat_args { char *path; struct stat *ub; }; #endif int stat(td, uap) struct thread *td; register struct stat_args /* { char *path; struct stat *ub; } */ *uap; { struct stat sb; int error; error = kern_stat(td, uap->path, UIO_USERSPACE, &sb); if (error == 0) error = copyout(&sb, uap->ub, sizeof (sb)); return (error); } #ifndef _SYS_SYSPROTO_H_ struct fstatat_args { int fd; char *path; struct stat *buf; int flag; } #endif int fstatat(struct thread *td, struct fstatat_args *uap) { struct stat sb; int error; error = kern_statat(td, uap->flag, uap->fd, uap->path, UIO_USERSPACE, &sb); if (error == 0) error = copyout(&sb, uap->buf, sizeof (sb)); return (error); } int kern_stat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp) { return (kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp)); } int kern_statat(struct thread *td, int flag, int fd, char *path, enum uio_seg pathseg, struct stat *sbp) { return (kern_statat_vnhook(td, flag, fd, path, pathseg, sbp, NULL)); } int kern_statat_vnhook(struct thread *td, int flag, int fd, char *path, enum uio_seg pathseg, struct stat *sbp, void (*hook)(struct vnode *vp, struct stat *sbp)) { struct nameidata nd; struct stat sb; int error, vfslocked; if (flag & ~AT_SYMLINK_NOFOLLOW) return (EINVAL); NDINIT_AT(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1 | MPSAFE, pathseg, path, fd, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); error = vn_stat(nd.ni_vp, &sb, td->td_ucred, NOCRED, td); if (!error) { SDT_PROBE(vfs, , stat, mode, path, sb.st_mode, 0, 0, 0); if (S_ISREG(sb.st_mode)) SDT_PROBE(vfs, , stat, reg, path, pathseg, 0, 0, 0); if (__predict_false(hook != NULL)) hook(nd.ni_vp, &sb); } NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); if (error) return (error); *sbp = sb; #ifdef KTRACE if (KTRPOINT(td, KTR_STRUCT)) ktrstat(&sb); #endif return (0); } /* * Get file status; this version does not follow links. */ #ifndef _SYS_SYSPROTO_H_ struct lstat_args { char *path; struct stat *ub; }; #endif int lstat(td, uap) struct thread *td; register struct lstat_args /* { char *path; struct stat *ub; } */ *uap; { struct stat sb; int error; error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb); if (error == 0) error = copyout(&sb, uap->ub, sizeof (sb)); return (error); } int kern_lstat(struct thread *td, char *path, enum uio_seg pathseg, struct stat *sbp) { return (kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path, pathseg, sbp)); } /* * Implementation of the NetBSD [l]stat() functions. */ void cvtnstat(sb, nsb) struct stat *sb; struct nstat *nsb; { bzero(nsb, sizeof *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; nsb->st_birthtimespec = sb->st_birthtimespec; } #ifndef _SYS_SYSPROTO_H_ struct nstat_args { char *path; struct nstat *ub; }; #endif int nstat(td, uap) struct thread *td; register struct nstat_args /* { char *path; struct nstat *ub; } */ *uap; { struct stat sb; struct nstat nsb; int error; error = kern_stat(td, uap->path, UIO_USERSPACE, &sb); if (error) return (error); cvtnstat(&sb, &nsb); error = copyout(&nsb, uap->ub, sizeof (nsb)); return (error); } /* * NetBSD lstat. Get file status; this version does not follow links. */ #ifndef _SYS_SYSPROTO_H_ struct lstat_args { char *path; struct stat *ub; }; #endif int nlstat(td, uap) struct thread *td; register struct nlstat_args /* { char *path; struct nstat *ub; } */ *uap; { struct stat sb; struct nstat nsb; int error; error = kern_lstat(td, uap->path, UIO_USERSPACE, &sb); if (error) return (error); cvtnstat(&sb, &nsb); error = copyout(&nsb, uap->ub, sizeof (nsb)); return (error); } /* * Get configurable pathname variables. */ #ifndef _SYS_SYSPROTO_H_ struct pathconf_args { char *path; int name; }; #endif int pathconf(td, uap) struct thread *td; register struct pathconf_args /* { char *path; int name; } */ *uap; { return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, FOLLOW)); } #ifndef _SYS_SYSPROTO_H_ struct lpathconf_args { char *path; int name; }; #endif int lpathconf(td, uap) struct thread *td; register struct lpathconf_args /* { char *path; int name; } */ *uap; { return (kern_pathconf(td, uap->path, UIO_USERSPACE, uap->name, NOFOLLOW)); } int kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name, u_long flags) { struct nameidata nd; int error, vfslocked; NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | MPSAFE | AUDITVNODE1 | flags, pathseg, path, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); NDFREE(&nd, NDF_ONLY_PNBUF); /* If asynchronous I/O is available, it works for all files. */ if (name == _PC_ASYNC_IO) td->td_retval[0] = async_io_version; else error = VOP_PATHCONF(nd.ni_vp, name, td->td_retval); vput(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Return target name of a symbolic link. */ #ifndef _SYS_SYSPROTO_H_ struct readlink_args { char *path; char *buf; size_t count; }; #endif int readlink(td, uap) struct thread *td; register struct readlink_args /* { char *path; char *buf; size_t count; } */ *uap; { return (kern_readlink(td, uap->path, UIO_USERSPACE, uap->buf, UIO_USERSPACE, uap->count)); } #ifndef _SYS_SYSPROTO_H_ struct readlinkat_args { int fd; char *path; char *buf; size_t bufsize; }; #endif int readlinkat(struct thread *td, struct readlinkat_args *uap) { return (kern_readlinkat(td, uap->fd, uap->path, UIO_USERSPACE, uap->buf, UIO_USERSPACE, uap->bufsize)); } int kern_readlink(struct thread *td, char *path, enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count) { return (kern_readlinkat(td, AT_FDCWD, path, pathseg, buf, bufseg, count)); } int kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg, char *buf, enum uio_seg bufseg, size_t count) { struct vnode *vp; struct iovec aiov; struct uio auio; int error; struct nameidata nd; int vfslocked; if (count > INT_MAX) return (EINVAL); NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE | AUDITVNODE1, pathseg, path, fd, td); if ((error = namei(&nd)) != 0) return (error); NDFREE(&nd, NDF_ONLY_PNBUF); vfslocked = NDHASGIANT(&nd); vp = nd.ni_vp; #ifdef MAC error = mac_vnode_check_readlink(td->td_ucred, vp); if (error) { vput(vp); VFS_UNLOCK_GIANT(vfslocked); return (error); } #endif if (vp->v_type != VLNK) error = EINVAL; else { aiov.iov_base = buf; aiov.iov_len = count; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = 0; auio.uio_rw = UIO_READ; auio.uio_segflg = bufseg; auio.uio_td = td; auio.uio_resid = count; error = VOP_READLINK(vp, &auio, td->td_ucred); } vput(vp); VFS_UNLOCK_GIANT(vfslocked); td->td_retval[0] = count - auio.uio_resid; return (error); } /* * Common implementation code for chflags() and fchflags(). */ static int setfflags(td, vp, flags) struct thread *td; struct vnode *vp; int flags; { int error; struct mount *mp; struct vattr vattr; /* * Prevent non-root users from setting flags on devices. When * a device is reused, users can retain ownership of the device * if they are allowed to set flags and programs assume that * chown can't fail when done as root. */ if (vp->v_type == VCHR || vp->v_type == VBLK) { error = priv_check(td, PRIV_VFS_CHFLAGS_DEV); if (error) return (error); } if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) return (error); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); VATTR_NULL(&vattr); vattr.va_flags = flags; #ifdef MAC error = mac_vnode_check_setflags(td->td_ucred, vp, vattr.va_flags); if (error == 0) #endif error = VOP_SETATTR(vp, &vattr, td->td_ucred); VOP_UNLOCK(vp, 0); vn_finished_write(mp); return (error); } /* * Change flags of a file given a path name. */ #ifndef _SYS_SYSPROTO_H_ struct chflags_args { char *path; int flags; }; #endif int chflags(td, uap) struct thread *td; register struct chflags_args /* { char *path; int flags; } */ *uap; { int error; struct nameidata nd; int vfslocked; AUDIT_ARG_FFLAGS(uap->flags); NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, UIO_USERSPACE, uap->path, td); if ((error = namei(&nd)) != 0) return (error); NDFREE(&nd, NDF_ONLY_PNBUF); vfslocked = NDHASGIANT(&nd); error = setfflags(td, nd.ni_vp, uap->flags); vrele(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Same as chflags() but doesn't follow symlinks. */ int lchflags(td, uap) struct thread *td; register struct lchflags_args /* { char *path; int flags; } */ *uap; { int error; struct nameidata nd; int vfslocked; AUDIT_ARG_FFLAGS(uap->flags); NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE | AUDITVNODE1, UIO_USERSPACE, uap->path, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); NDFREE(&nd, NDF_ONLY_PNBUF); error = setfflags(td, nd.ni_vp, uap->flags); vrele(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Change flags of a file given a file descriptor. */ #ifndef _SYS_SYSPROTO_H_ struct fchflags_args { int fd; int flags; }; #endif int fchflags(td, uap) struct thread *td; register struct fchflags_args /* { int fd; int flags; } */ *uap; { struct file *fp; int vfslocked; int error; AUDIT_ARG_FD(uap->fd); AUDIT_ARG_FFLAGS(uap->flags); if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) return (error); vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); #ifdef AUDIT vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); AUDIT_ARG_VNODE1(fp->f_vnode); VOP_UNLOCK(fp->f_vnode, 0); #endif error = setfflags(td, fp->f_vnode, uap->flags); VFS_UNLOCK_GIANT(vfslocked); fdrop(fp, td); return (error); } /* * Common implementation code for chmod(), lchmod() and fchmod(). */ static int setfmode(td, vp, mode) struct thread *td; struct vnode *vp; int mode; { int error; struct mount *mp; struct vattr vattr; if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) return (error); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); VATTR_NULL(&vattr); vattr.va_mode = mode & ALLPERMS; #ifdef MAC error = mac_vnode_check_setmode(td->td_ucred, vp, vattr.va_mode); if (error == 0) #endif error = VOP_SETATTR(vp, &vattr, td->td_ucred); VOP_UNLOCK(vp, 0); vn_finished_write(mp); return (error); } /* * Change mode of a file given path name. */ #ifndef _SYS_SYSPROTO_H_ struct chmod_args { char *path; int mode; }; #endif int chmod(td, uap) struct thread *td; register struct chmod_args /* { char *path; int mode; } */ *uap; { return (kern_chmod(td, uap->path, UIO_USERSPACE, uap->mode)); } #ifndef _SYS_SYSPROTO_H_ struct fchmodat_args { int dirfd; char *path; mode_t mode; int flag; } #endif int fchmodat(struct thread *td, struct fchmodat_args *uap) { int flag = uap->flag; int fd = uap->fd; char *path = uap->path; mode_t mode = uap->mode; if (flag & ~AT_SYMLINK_NOFOLLOW) return (EINVAL); return (kern_fchmodat(td, fd, path, UIO_USERSPACE, mode, flag)); } int kern_chmod(struct thread *td, char *path, enum uio_seg pathseg, int mode) { return (kern_fchmodat(td, AT_FDCWD, path, pathseg, mode, 0)); } /* * Change mode of a file given path name (don't follow links.) */ #ifndef _SYS_SYSPROTO_H_ struct lchmod_args { char *path; int mode; }; #endif int lchmod(td, uap) struct thread *td; register struct lchmod_args /* { char *path; int mode; } */ *uap; { return (kern_fchmodat(td, AT_FDCWD, uap->path, UIO_USERSPACE, uap->mode, AT_SYMLINK_NOFOLLOW)); } int kern_fchmodat(struct thread *td, int fd, char *path, enum uio_seg pathseg, mode_t mode, int flag) { int error; struct nameidata nd; int vfslocked; int follow; AUDIT_ARG_MODE(mode); follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; NDINIT_AT(&nd, LOOKUP, follow | MPSAFE | AUDITVNODE1, pathseg, path, fd, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); NDFREE(&nd, NDF_ONLY_PNBUF); error = setfmode(td, nd.ni_vp, mode); vrele(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Change mode of a file given a file descriptor. */ #ifndef _SYS_SYSPROTO_H_ struct fchmod_args { int fd; int mode; }; #endif int fchmod(td, uap) struct thread *td; register struct fchmod_args /* { int fd; int mode; } */ *uap; { struct file *fp; int vfslocked; int error; AUDIT_ARG_FD(uap->fd); AUDIT_ARG_MODE(uap->mode); if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) return (error); vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); #ifdef AUDIT vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); AUDIT_ARG_VNODE1(fp->f_vnode); VOP_UNLOCK(fp->f_vnode, 0); #endif error = setfmode(td, fp->f_vnode, uap->mode); VFS_UNLOCK_GIANT(vfslocked); fdrop(fp, td); return (error); } /* * Common implementation for chown(), lchown(), and fchown() */ static int setfown(td, vp, uid, gid) struct thread *td; struct vnode *vp; uid_t uid; gid_t gid; { int error; struct mount *mp; struct vattr vattr; if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) return (error); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); VATTR_NULL(&vattr); vattr.va_uid = uid; vattr.va_gid = gid; #ifdef MAC error = mac_vnode_check_setowner(td->td_ucred, vp, vattr.va_uid, vattr.va_gid); if (error == 0) #endif error = VOP_SETATTR(vp, &vattr, td->td_ucred); VOP_UNLOCK(vp, 0); vn_finished_write(mp); return (error); } /* * Set ownership given a path name. */ #ifndef _SYS_SYSPROTO_H_ struct chown_args { char *path; int uid; int gid; }; #endif int chown(td, uap) struct thread *td; register struct chown_args /* { char *path; int uid; int gid; } */ *uap; { return (kern_chown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid)); } #ifndef _SYS_SYSPROTO_H_ struct fchownat_args { int fd; const char * path; uid_t uid; gid_t gid; int flag; }; #endif int fchownat(struct thread *td, struct fchownat_args *uap) { int flag; flag = uap->flag; if (flag & ~AT_SYMLINK_NOFOLLOW) return (EINVAL); return (kern_fchownat(td, uap->fd, uap->path, UIO_USERSPACE, uap->uid, uap->gid, uap->flag)); } int kern_chown(struct thread *td, char *path, enum uio_seg pathseg, int uid, int gid) { return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid, 0)); } int kern_fchownat(struct thread *td, int fd, char *path, enum uio_seg pathseg, int uid, int gid, int flag) { struct nameidata nd; int error, vfslocked, follow; AUDIT_ARG_OWNER(uid, gid); follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; NDINIT_AT(&nd, LOOKUP, follow | MPSAFE | AUDITVNODE1, pathseg, path, fd, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); NDFREE(&nd, NDF_ONLY_PNBUF); error = setfown(td, nd.ni_vp, uid, gid); vrele(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); 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 int lchown(td, uap) struct thread *td; register struct lchown_args /* { char *path; int uid; int gid; } */ *uap; { return (kern_lchown(td, uap->path, UIO_USERSPACE, uap->uid, uap->gid)); } int kern_lchown(struct thread *td, char *path, enum uio_seg pathseg, int uid, int gid) { return (kern_fchownat(td, AT_FDCWD, path, pathseg, uid, gid, AT_SYMLINK_NOFOLLOW)); } /* * Set ownership given a file descriptor. */ #ifndef _SYS_SYSPROTO_H_ struct fchown_args { int fd; int uid; int gid; }; #endif int fchown(td, uap) struct thread *td; register struct fchown_args /* { int fd; int uid; int gid; } */ *uap; { struct file *fp; int vfslocked; int error; AUDIT_ARG_FD(uap->fd); AUDIT_ARG_OWNER(uap->uid, uap->gid); if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) return (error); vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); #ifdef AUDIT vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); AUDIT_ARG_VNODE1(fp->f_vnode); VOP_UNLOCK(fp->f_vnode, 0); #endif error = setfown(td, fp->f_vnode, uap->uid, uap->gid); VFS_UNLOCK_GIANT(vfslocked); fdrop(fp, td); return (error); } /* * Common implementation code for utimes(), lutimes(), and futimes(). */ static int getutimes(usrtvp, tvpseg, tsp) const struct timeval *usrtvp; enum uio_seg tvpseg; struct timespec *tsp; { struct timeval tv[2]; const struct timeval *tvp; int error; if (usrtvp == NULL) { vfs_timestamp(&tsp[0]); tsp[1] = tsp[0]; } else { if (tvpseg == UIO_SYSSPACE) { tvp = usrtvp; } else { if ((error = copyin(usrtvp, tv, sizeof(tv))) != 0) return (error); tvp = tv; } if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000 || tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000) return (EINVAL); TIMEVAL_TO_TIMESPEC(&tvp[0], &tsp[0]); TIMEVAL_TO_TIMESPEC(&tvp[1], &tsp[1]); } return (0); } /* * Common implementation code for utimes(), lutimes(), and futimes(). */ static int setutimes(td, vp, ts, numtimes, nullflag) struct thread *td; struct vnode *vp; const struct timespec *ts; int numtimes; int nullflag; { int error, setbirthtime; struct mount *mp; struct vattr vattr; if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) return (error); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); setbirthtime = 0; if (numtimes < 3 && !VOP_GETATTR(vp, &vattr, td->td_ucred) && timespeccmp(&ts[1], &vattr.va_birthtime, < )) setbirthtime = 1; VATTR_NULL(&vattr); vattr.va_atime = ts[0]; vattr.va_mtime = ts[1]; if (setbirthtime) vattr.va_birthtime = ts[1]; if (numtimes > 2) vattr.va_birthtime = ts[2]; if (nullflag) vattr.va_vaflags |= VA_UTIMES_NULL; #ifdef MAC error = mac_vnode_check_setutimes(td->td_ucred, vp, vattr.va_atime, vattr.va_mtime); #endif if (error == 0) error = VOP_SETATTR(vp, &vattr, td->td_ucred); VOP_UNLOCK(vp, 0); vn_finished_write(mp); return (error); } /* * Set the access and modification times of a file. */ #ifndef _SYS_SYSPROTO_H_ struct utimes_args { char *path; struct timeval *tptr; }; #endif int utimes(td, uap) struct thread *td; register struct utimes_args /* { char *path; struct timeval *tptr; } */ *uap; { return (kern_utimes(td, uap->path, UIO_USERSPACE, uap->tptr, UIO_USERSPACE)); } #ifndef _SYS_SYSPROTO_H_ struct futimesat_args { int fd; const char * path; const struct timeval * times; }; #endif int futimesat(struct thread *td, struct futimesat_args *uap) { return (kern_utimesat(td, uap->fd, uap->path, UIO_USERSPACE, uap->times, UIO_USERSPACE)); } int kern_utimes(struct thread *td, char *path, enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg) { return (kern_utimesat(td, AT_FDCWD, path, pathseg, tptr, tptrseg)); } int kern_utimesat(struct thread *td, int fd, char *path, enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg) { struct nameidata nd; struct timespec ts[2]; int error, vfslocked; if ((error = getutimes(tptr, tptrseg, ts)) != 0) return (error); NDINIT_AT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, fd, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); NDFREE(&nd, NDF_ONLY_PNBUF); error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); vrele(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Set the access and modification times of a file. */ #ifndef _SYS_SYSPROTO_H_ struct lutimes_args { char *path; struct timeval *tptr; }; #endif int lutimes(td, uap) struct thread *td; register struct lutimes_args /* { char *path; struct timeval *tptr; } */ *uap; { return (kern_lutimes(td, uap->path, UIO_USERSPACE, uap->tptr, UIO_USERSPACE)); } int kern_lutimes(struct thread *td, char *path, enum uio_seg pathseg, struct timeval *tptr, enum uio_seg tptrseg) { struct timespec ts[2]; int error; struct nameidata nd; int vfslocked; if ((error = getutimes(tptr, tptrseg, ts)) != 0) return (error); NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); NDFREE(&nd, NDF_ONLY_PNBUF); error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL); vrele(nd.ni_vp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Set the access and modification times of a file. */ #ifndef _SYS_SYSPROTO_H_ struct futimes_args { int fd; struct timeval *tptr; }; #endif int futimes(td, uap) struct thread *td; register struct futimes_args /* { int fd; struct timeval *tptr; } */ *uap; { return (kern_futimes(td, uap->fd, uap->tptr, UIO_USERSPACE)); } int kern_futimes(struct thread *td, int fd, struct timeval *tptr, enum uio_seg tptrseg) { struct timespec ts[2]; struct file *fp; int vfslocked; int error; AUDIT_ARG_FD(fd); if ((error = getutimes(tptr, tptrseg, ts)) != 0) return (error); if ((error = getvnode(td->td_proc->p_fd, fd, &fp)) != 0) return (error); vfslocked = VFS_LOCK_GIANT(fp->f_vnode->v_mount); #ifdef AUDIT vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); AUDIT_ARG_VNODE1(fp->f_vnode); VOP_UNLOCK(fp->f_vnode, 0); #endif error = setutimes(td, fp->f_vnode, ts, 2, tptr == NULL); VFS_UNLOCK_GIANT(vfslocked); fdrop(fp, td); return (error); } /* * Truncate a file given its path name. */ #ifndef _SYS_SYSPROTO_H_ struct truncate_args { char *path; int pad; off_t length; }; #endif int truncate(td, uap) struct thread *td; register struct truncate_args /* { char *path; int pad; off_t length; } */ *uap; { return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length)); } int kern_truncate(struct thread *td, char *path, enum uio_seg pathseg, off_t length) { struct mount *mp; struct vnode *vp; struct vattr vattr; int error; struct nameidata nd; int vfslocked; if (length < 0) return(EINVAL); NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE | AUDITVNODE1, pathseg, path, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); vp = nd.ni_vp; if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) { vrele(vp); VFS_UNLOCK_GIANT(vfslocked); return (error); } NDFREE(&nd, NDF_ONLY_PNBUF); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if (vp->v_type == VDIR) error = EISDIR; #ifdef MAC else if ((error = mac_vnode_check_write(td->td_ucred, NOCRED, vp))) { } #endif else if ((error = vn_writechk(vp)) == 0 && (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) { VATTR_NULL(&vattr); vattr.va_size = length; error = VOP_SETATTR(vp, &vattr, td->td_ucred); } vput(vp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } #if defined(COMPAT_43) /* * Truncate a file given its path name. */ #ifndef _SYS_SYSPROTO_H_ struct otruncate_args { char *path; long length; }; #endif int otruncate(td, uap) struct thread *td; register struct otruncate_args /* { char *path; long length; } */ *uap; { struct truncate_args /* { char *path; int pad; off_t length; } */ nuap; nuap.path = uap->path; nuap.length = uap->length; return (truncate(td, &nuap)); } #endif /* COMPAT_43 */ /* Versions with the pad argument */ int freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap) { struct truncate_args ouap; ouap.path = uap->path; ouap.length = uap->length; return (truncate(td, &ouap)); } int freebsd6_ftruncate(struct thread *td, struct freebsd6_ftruncate_args *uap) { struct ftruncate_args ouap; ouap.fd = uap->fd; ouap.length = uap->length; return (ftruncate(td, &ouap)); } /* * Sync an open file. */ #ifndef _SYS_SYSPROTO_H_ struct fsync_args { int fd; }; #endif int fsync(td, uap) struct thread *td; struct fsync_args /* { int fd; } */ *uap; { struct vnode *vp; struct mount *mp; struct file *fp; int vfslocked; int error, lock_flags; AUDIT_ARG_FD(uap->fd); if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) return (error); vp = fp->f_vnode; vfslocked = VFS_LOCK_GIANT(vp->v_mount); if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) goto drop; if (MNT_SHARED_WRITES(mp) || ((mp == NULL) && MNT_SHARED_WRITES(vp->v_mount))) { lock_flags = LK_SHARED; } else { lock_flags = LK_EXCLUSIVE; } vn_lock(vp, lock_flags | LK_RETRY); AUDIT_ARG_VNODE1(vp); if (vp->v_object != NULL) { VM_OBJECT_LOCK(vp->v_object); vm_object_page_clean(vp->v_object, 0, 0, 0); VM_OBJECT_UNLOCK(vp->v_object); } error = VOP_FSYNC(vp, MNT_WAIT, td); VOP_UNLOCK(vp, 0); vn_finished_write(mp); drop: VFS_UNLOCK_GIANT(vfslocked); fdrop(fp, td); 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 int rename(td, uap) struct thread *td; register struct rename_args /* { char *from; char *to; } */ *uap; { return (kern_rename(td, uap->from, uap->to, UIO_USERSPACE)); } #ifndef _SYS_SYSPROTO_H_ struct renameat_args { int oldfd; char *old; int newfd; char *new; }; #endif int renameat(struct thread *td, struct renameat_args *uap) { return (kern_renameat(td, uap->oldfd, uap->old, uap->newfd, uap->new, UIO_USERSPACE)); } int kern_rename(struct thread *td, char *from, char *to, enum uio_seg pathseg) { return (kern_renameat(td, AT_FDCWD, from, AT_FDCWD, to, pathseg)); } int kern_renameat(struct thread *td, int oldfd, char *old, int newfd, char *new, enum uio_seg pathseg) { struct mount *mp = NULL; struct vnode *tvp, *fvp, *tdvp; struct nameidata fromnd, tond; int tvfslocked; int fvfslocked; int error; bwillwrite(); #ifdef MAC NDINIT_AT(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART | MPSAFE | AUDITVNODE1, pathseg, old, oldfd, td); #else NDINIT_AT(&fromnd, DELETE, WANTPARENT | SAVESTART | MPSAFE | AUDITVNODE1, pathseg, old, oldfd, td); #endif if ((error = namei(&fromnd)) != 0) return (error); fvfslocked = NDHASGIANT(&fromnd); tvfslocked = 0; #ifdef MAC error = mac_vnode_check_rename_from(td->td_ucred, fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd); VOP_UNLOCK(fromnd.ni_dvp, 0); if (fromnd.ni_dvp != fromnd.ni_vp) VOP_UNLOCK(fromnd.ni_vp, 0); #endif fvp = fromnd.ni_vp; if (error == 0) error = vn_start_write(fvp, &mp, V_WAIT | PCATCH); if (error != 0) { NDFREE(&fromnd, NDF_ONLY_PNBUF); vrele(fromnd.ni_dvp); vrele(fvp); goto out1; } NDINIT_AT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | MPSAFE | AUDITVNODE2, pathseg, new, newfd, td); 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; NDFREE(&fromnd, NDF_ONLY_PNBUF); vrele(fromnd.ni_dvp); vrele(fvp); vn_finished_write(mp); goto out1; } tvfslocked = NDHASGIANT(&tond); 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; goto out; } /* * If the source is the same as the destination (that is, if they * are links to the same vnode), then there is nothing to do. */ if (fvp == tvp) error = -1; #ifdef MAC else error = mac_vnode_check_rename_to(td->td_ucred, tdvp, tond.ni_vp, fromnd.ni_dvp == tdvp, &tond.ni_cnd); #endif out: if (!error) { error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); NDFREE(&fromnd, NDF_ONLY_PNBUF); NDFREE(&tond, NDF_ONLY_PNBUF); } else { NDFREE(&fromnd, NDF_ONLY_PNBUF); NDFREE(&tond, NDF_ONLY_PNBUF); if (tvp) vput(tvp); if (tdvp == tvp) vrele(tdvp); else vput(tdvp); vrele(fromnd.ni_dvp); vrele(fvp); } vrele(tond.ni_startdir); vn_finished_write(mp); out1: if (fromnd.ni_startdir) vrele(fromnd.ni_startdir); VFS_UNLOCK_GIANT(fvfslocked); VFS_UNLOCK_GIANT(tvfslocked); if (error == -1) return (0); return (error); } /* * Make a directory file. */ #ifndef _SYS_SYSPROTO_H_ struct mkdir_args { char *path; int mode; }; #endif int mkdir(td, uap) struct thread *td; register struct mkdir_args /* { char *path; int mode; } */ *uap; { return (kern_mkdir(td, uap->path, UIO_USERSPACE, uap->mode)); } #ifndef _SYS_SYSPROTO_H_ struct mkdirat_args { int fd; char *path; mode_t mode; }; #endif int mkdirat(struct thread *td, struct mkdirat_args *uap) { return (kern_mkdirat(td, uap->fd, uap->path, UIO_USERSPACE, uap->mode)); } int kern_mkdir(struct thread *td, char *path, enum uio_seg segflg, int mode) { return (kern_mkdirat(td, AT_FDCWD, path, segflg, mode)); } int kern_mkdirat(struct thread *td, int fd, char *path, enum uio_seg segflg, int mode) { struct mount *mp; struct vnode *vp; struct vattr vattr; int error; struct nameidata nd; int vfslocked; AUDIT_ARG_MODE(mode); restart: bwillwrite(); NDINIT_AT(&nd, CREATE, LOCKPARENT | SAVENAME | MPSAFE | AUDITVNODE1, segflg, path, fd, td); nd.ni_cnd.cn_flags |= WILLBEDIR; if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); vp = nd.ni_vp; if (vp != NULL) { NDFREE(&nd, NDF_ONLY_PNBUF); /* * XXX namei called with LOCKPARENT but not LOCKLEAF has * the strange behaviour of leaving the vnode unlocked * if the target is the same vnode as the parent. */ if (vp == nd.ni_dvp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(vp); VFS_UNLOCK_GIANT(vfslocked); return (EEXIST); } if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_dvp); VFS_UNLOCK_GIANT(vfslocked); if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) return (error); goto restart; } VATTR_NULL(&vattr); vattr.va_type = VDIR; vattr.va_mode = (mode & ACCESSPERMS) &~ td->td_proc->p_fd->fd_cmask; #ifdef MAC error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd, &vattr); if (error) goto out; #endif error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); #ifdef MAC out: #endif NDFREE(&nd, NDF_ONLY_PNBUF); vput(nd.ni_dvp); if (!error) vput(nd.ni_vp); vn_finished_write(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Remove a directory file. */ #ifndef _SYS_SYSPROTO_H_ struct rmdir_args { char *path; }; #endif int rmdir(td, uap) struct thread *td; struct rmdir_args /* { char *path; } */ *uap; { return (kern_rmdir(td, uap->path, UIO_USERSPACE)); } int kern_rmdir(struct thread *td, char *path, enum uio_seg pathseg) { return (kern_rmdirat(td, AT_FDCWD, path, pathseg)); } int kern_rmdirat(struct thread *td, int fd, char *path, enum uio_seg pathseg) { struct mount *mp; struct vnode *vp; int error; struct nameidata nd; int vfslocked; restart: bwillwrite(); NDINIT_AT(&nd, DELETE, LOCKPARENT | LOCKLEAF | MPSAFE | AUDITVNODE1, pathseg, path, fd, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); 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) { error = EBUSY; goto out; } #ifdef MAC error = mac_vnode_check_unlink(td->td_ucred, nd.ni_dvp, vp, &nd.ni_cnd); if (error) goto out; #endif if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { NDFREE(&nd, NDF_ONLY_PNBUF); vput(vp); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); VFS_UNLOCK_GIANT(vfslocked); if ((error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH)) != 0) return (error); goto restart; } error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); vn_finished_write(mp); out: NDFREE(&nd, NDF_ONLY_PNBUF); vput(vp); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); VFS_UNLOCK_GIANT(vfslocked); return (error); } #ifdef COMPAT_43 /* * Read a block of directory entries in a filesystem independent format. */ #ifndef _SYS_SYSPROTO_H_ struct ogetdirentries_args { int fd; char *buf; u_int count; long *basep; }; #endif int ogetdirentries(td, uap) struct thread *td; register struct ogetdirentries_args /* { int fd; char *buf; u_int count; 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, vfslocked; long loff; /* XXX arbitrary sanity limit on `count'. */ if (uap->count > 64 * 1024) return (EINVAL); if ((error = getvnode(td->td_proc->p_fd, uap->fd, &fp)) != 0) return (error); if ((fp->f_flag & FREAD) == 0) { fdrop(fp, td); return (EBADF); } vp = fp->f_vnode; unionread: vfslocked = VFS_LOCK_GIANT(vp->v_mount); if (vp->v_type != VDIR) { VFS_UNLOCK_GIANT(vfslocked); fdrop(fp, td); return (EINVAL); } aiov.iov_base = uap->buf; aiov.iov_len = uap->count; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_rw = UIO_READ; auio.uio_segflg = UIO_USERSPACE; auio.uio_td = td; auio.uio_resid = uap->count; vn_lock(vp, LK_SHARED | LK_RETRY); loff = auio.uio_offset = fp->f_offset; #ifdef MAC error = mac_vnode_check_readdir(td->td_ucred, vp); if (error) { VOP_UNLOCK(vp, 0); VFS_UNLOCK_GIANT(vfslocked); fdrop(fp, td); return (error); } #endif # 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 = uap->count; dirbuf = malloc(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 = 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); } if (error) { VOP_UNLOCK(vp, 0); VFS_UNLOCK_GIANT(vfslocked); fdrop(fp, td); return (error); } if (uap->count == auio.uio_resid && (vp->v_vflag & VV_ROOT) && (vp->v_mount->mnt_flag & MNT_UNION)) { struct vnode *tvp = vp; vp = vp->v_mount->mnt_vnodecovered; VREF(vp); fp->f_vnode = vp; fp->f_data = vp; fp->f_offset = 0; vput(tvp); VFS_UNLOCK_GIANT(vfslocked); goto unionread; } VOP_UNLOCK(vp, 0); VFS_UNLOCK_GIANT(vfslocked); error = copyout(&loff, uap->basep, sizeof(long)); fdrop(fp, td); td->td_retval[0] = uap->count - auio.uio_resid; return (error); } #endif /* COMPAT_43 */ /* * Read a block of directory entries in a filesystem independent format. */ #ifndef _SYS_SYSPROTO_H_ struct getdirentries_args { int fd; char *buf; u_int count; long *basep; }; #endif int getdirentries(td, uap) struct thread *td; register struct getdirentries_args /* { int fd; char *buf; u_int count; long *basep; } */ *uap; { long base; int error; error = kern_getdirentries(td, uap->fd, uap->buf, uap->count, &base); if (error) return (error); if (uap->basep != NULL) error = copyout(&base, uap->basep, sizeof(long)); return (error); } int kern_getdirentries(struct thread *td, int fd, char *buf, u_int count, long *basep) { struct vnode *vp; struct file *fp; struct uio auio; struct iovec aiov; int vfslocked; long loff; int error, eofflag; AUDIT_ARG_FD(fd); if (count > INT_MAX) return (EINVAL); if ((error = getvnode(td->td_proc->p_fd, fd, &fp)) != 0) return (error); if ((fp->f_flag & FREAD) == 0) { fdrop(fp, td); return (EBADF); } vp = fp->f_vnode; unionread: vfslocked = VFS_LOCK_GIANT(vp->v_mount); if (vp->v_type != VDIR) { VFS_UNLOCK_GIANT(vfslocked); error = EINVAL; goto fail; } aiov.iov_base = buf; aiov.iov_len = count; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_rw = UIO_READ; auio.uio_segflg = UIO_USERSPACE; auio.uio_td = td; auio.uio_resid = count; vn_lock(vp, LK_SHARED | LK_RETRY); AUDIT_ARG_VNODE1(vp); loff = auio.uio_offset = fp->f_offset; #ifdef MAC error = mac_vnode_check_readdir(td->td_ucred, vp); if (error == 0) #endif error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, NULL, NULL); fp->f_offset = auio.uio_offset; if (error) { VOP_UNLOCK(vp, 0); VFS_UNLOCK_GIANT(vfslocked); goto fail; } if (count == auio.uio_resid && (vp->v_vflag & VV_ROOT) && (vp->v_mount->mnt_flag & MNT_UNION)) { struct vnode *tvp = vp; vp = vp->v_mount->mnt_vnodecovered; VREF(vp); fp->f_vnode = vp; fp->f_data = vp; fp->f_offset = 0; vput(tvp); VFS_UNLOCK_GIANT(vfslocked); goto unionread; } VOP_UNLOCK(vp, 0); VFS_UNLOCK_GIANT(vfslocked); *basep = loff; td->td_retval[0] = count - auio.uio_resid; fail: fdrop(fp, td); return (error); } #ifndef _SYS_SYSPROTO_H_ struct getdents_args { int fd; char *buf; size_t count; }; #endif int getdents(td, uap) struct thread *td; register struct getdents_args /* { int fd; char *buf; 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(td, &ap)); } /* * Set the mode mask for creation of filesystem nodes. */ #ifndef _SYS_SYSPROTO_H_ struct umask_args { int newmask; }; #endif int umask(td, uap) struct thread *td; struct umask_args /* { int newmask; } */ *uap; { register struct filedesc *fdp; FILEDESC_XLOCK(td->td_proc->p_fd); fdp = td->td_proc->p_fd; td->td_retval[0] = fdp->fd_cmask; fdp->fd_cmask = uap->newmask & ALLPERMS; FILEDESC_XUNLOCK(td->td_proc->p_fd); return (0); } /* * Void all references to file by ripping underlying filesystem away from * vnode. */ #ifndef _SYS_SYSPROTO_H_ struct revoke_args { char *path; }; #endif int revoke(td, uap) struct thread *td; register struct revoke_args /* { char *path; } */ *uap; { struct vnode *vp; struct vattr vattr; int error; struct nameidata nd; int vfslocked; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, UIO_USERSPACE, uap->path, td); if ((error = namei(&nd)) != 0) return (error); vfslocked = NDHASGIANT(&nd); vp = nd.ni_vp; NDFREE(&nd, NDF_ONLY_PNBUF); if (vp->v_type != VCHR || vp->v_rdev == NULL) { error = EINVAL; goto out; } #ifdef MAC error = mac_vnode_check_revoke(td->td_ucred, vp); if (error) goto out; #endif error = VOP_GETATTR(vp, &vattr, td->td_ucred); if (error) goto out; if (td->td_ucred->cr_uid != vattr.va_uid) { error = priv_check(td, PRIV_VFS_ADMIN); if (error) goto out; } if (vcount(vp) > 1) VOP_REVOKE(vp, REVOKEALL); out: vput(vp); VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Convert a user file descriptor to a kernel file entry. * A reference on the file entry is held upon returning. */ int getvnode(fdp, fd, fpp) struct filedesc *fdp; int fd; struct file **fpp; { int error; struct file *fp; error = 0; fp = NULL; if (fdp == NULL || (fp = fget_unlocked(fdp, fd)) == NULL) error = EBADF; else if (fp->f_vnode == NULL) { error = EINVAL; fdrop(fp, curthread); } *fpp = fp; return (error); } /* * Get an (NFS) file handle. */ #ifndef _SYS_SYSPROTO_H_ struct lgetfh_args { char *fname; fhandle_t *fhp; }; #endif int lgetfh(td, uap) struct thread *td; register struct lgetfh_args *uap; { struct nameidata nd; fhandle_t fh; register struct vnode *vp; int vfslocked; int error; error = priv_check(td, PRIV_VFS_GETFH); if (error) return (error); NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, UIO_USERSPACE, uap->fname, td); error = namei(&nd); if (error) return (error); vfslocked = NDHASGIANT(&nd); NDFREE(&nd, NDF_ONLY_PNBUF); vp = nd.ni_vp; bzero(&fh, sizeof(fh)); fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; error = VOP_VPTOFH(vp, &fh.fh_fid); vput(vp); VFS_UNLOCK_GIANT(vfslocked); if (error) return (error); error = copyout(&fh, uap->fhp, sizeof (fh)); return (error); } #ifndef _SYS_SYSPROTO_H_ struct getfh_args { char *fname; fhandle_t *fhp; }; #endif int getfh(td, uap) struct thread *td; register struct getfh_args *uap; { struct nameidata nd; fhandle_t fh; register struct vnode *vp; int vfslocked; int error; error = priv_check(td, PRIV_VFS_GETFH); if (error) return (error); NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, UIO_USERSPACE, uap->fname, td); error = namei(&nd); if (error) return (error); vfslocked = NDHASGIANT(&nd); NDFREE(&nd, NDF_ONLY_PNBUF); vp = nd.ni_vp; bzero(&fh, sizeof(fh)); fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; error = VOP_VPTOFH(vp, &fh.fh_fid); vput(vp); VFS_UNLOCK_GIANT(vfslocked); if (error) return (error); error = copyout(&fh, uap->fhp, sizeof (fh)); return (error); } /* * syscall for the rpc.lockd to use to translate a NFS file handle into an * open descriptor. * * warning: do not remove the priv_check() call or this becomes one giant * security hole. */ #ifndef _SYS_SYSPROTO_H_ struct fhopen_args { const struct fhandle *u_fhp; int flags; }; #endif int fhopen(td, uap) struct thread *td; struct fhopen_args /* { const struct fhandle *u_fhp; int flags; } */ *uap; { struct proc *p = td->td_proc; struct mount *mp; struct vnode *vp; struct fhandle fhp; struct vattr vat; struct vattr *vap = &vat; struct flock lf; struct file *fp; register struct filedesc *fdp = p->p_fd; int fmode, error, type; accmode_t accmode; struct file *nfp; int vfslocked; int indx; error = priv_check(td, PRIV_VFS_FHOPEN); if (error) return (error); fmode = FFLAGS(uap->flags); /* why not allow a non-read/write open for our lockd? */ if (((fmode & (FREAD | FWRITE)) == 0) || (fmode & O_CREAT)) return (EINVAL); error = copyin(uap->u_fhp, &fhp, sizeof(fhp)); if (error) return(error); /* find the mount point */ mp = vfs_busyfs(&fhp.fh_fsid); if (mp == NULL) return (ESTALE); vfslocked = VFS_LOCK_GIANT(mp); /* now give me my vnode, it gets returned to me locked */ error = VFS_FHTOVP(mp, &fhp.fh_fid, &vp); vfs_unbusy(mp); if (error) goto out; /* * from now on we have to make sure not * to forget about the vnode * any error that causes an abort must vput(vp) * just set error = err and 'goto bad;'. */ /* * from vn_open */ if (vp->v_type == VLNK) { error = EMLINK; goto bad; } if (vp->v_type == VSOCK) { error = EOPNOTSUPP; goto bad; } accmode = 0; if (fmode & (FWRITE | O_TRUNC)) { if (vp->v_type == VDIR) { error = EISDIR; goto bad; } error = vn_writechk(vp); if (error) goto bad; accmode |= VWRITE; } if (fmode & FREAD) accmode |= VREAD; if ((fmode & O_APPEND) && (fmode & FWRITE)) accmode |= VAPPEND; #ifdef MAC error = mac_vnode_check_open(td->td_ucred, vp, accmode); if (error) goto bad; #endif if (accmode) { error = VOP_ACCESS(vp, accmode, td->td_ucred, td); if (error) goto bad; } if (fmode & O_TRUNC) { vfs_ref(mp); VOP_UNLOCK(vp, 0); /* XXX */ if ((error = vn_start_write(NULL, &mp, V_WAIT | PCATCH)) != 0) { vrele(vp); vfs_rel(mp); goto out; } vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ vfs_rel(mp); #ifdef MAC /* * We don't yet have fp->f_cred, so use td->td_ucred, which * should be right. */ error = mac_vnode_check_write(td->td_ucred, td->td_ucred, vp); if (error == 0) { #endif VATTR_NULL(vap); vap->va_size = 0; error = VOP_SETATTR(vp, vap, td->td_ucred); #ifdef MAC } #endif vn_finished_write(mp); if (error) goto bad; } error = VOP_OPEN(vp, fmode, td->td_ucred, td, NULL); if (error) goto bad; if (fmode & FWRITE) vp->v_writecount++; /* * end of vn_open code */ if ((error = falloc(td, &nfp, &indx)) != 0) { if (fmode & FWRITE) vp->v_writecount--; goto bad; } /* An extra reference on `nfp' has been held for us by falloc(). */ fp = nfp; nfp->f_vnode = vp; finit(nfp, fmode & FMASK, DTYPE_VNODE, vp, &vnops); if (fmode & (O_EXLOCK | O_SHLOCK)) { lf.l_whence = SEEK_SET; lf.l_start = 0; lf.l_len = 0; if (fmode & O_EXLOCK) lf.l_type = F_WRLCK; else lf.l_type = F_RDLCK; type = F_FLOCK; if ((fmode & FNONBLOCK) == 0) type |= F_WAIT; VOP_UNLOCK(vp, 0); if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) { /* * The lock request failed. Normally close the * descriptor but handle the case where someone might * have dup()d or close()d it when we weren't looking. */ fdclose(fdp, fp, indx, td); /* * release our private reference */ fdrop(fp, td); goto out; } vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); atomic_set_int(&fp->f_flag, FHASLOCK); } VOP_UNLOCK(vp, 0); fdrop(fp, td); VFS_UNLOCK_GIANT(vfslocked); td->td_retval[0] = indx; return (0); bad: vput(vp); out: VFS_UNLOCK_GIANT(vfslocked); return (error); } /* * Stat an (NFS) file handle. */ #ifndef _SYS_SYSPROTO_H_ struct fhstat_args { struct fhandle *u_fhp; struct stat *sb; }; #endif int fhstat(td, uap) struct thread *td; register struct fhstat_args /* { struct fhandle *u_fhp; struct stat *sb; } */ *uap; { struct stat sb; fhandle_t fh; struct mount *mp; struct vnode *vp; int vfslocked; int error; error = priv_check(td, PRIV_VFS_FHSTAT); if (error) return (error); error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); if (error) return (error); if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) return (ESTALE); vfslocked = VFS_LOCK_GIANT(mp); error = VFS_FHTOVP(mp, &fh.fh_fid, &vp); vfs_unbusy(mp); if (error) { VFS_UNLOCK_GIANT(vfslocked); return (error); } error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td); vput(vp); VFS_UNLOCK_GIANT(vfslocked); if (error) return (error); error = copyout(&sb, uap->sb, sizeof(sb)); return (error); } /* * Implement fstatfs() for (NFS) file handles. */ #ifndef _SYS_SYSPROTO_H_ struct fhstatfs_args { struct fhandle *u_fhp; struct statfs *buf; }; #endif int fhstatfs(td, uap) struct thread *td; struct fhstatfs_args /* { struct fhandle *u_fhp; struct statfs *buf; } */ *uap; { struct statfs sf; fhandle_t fh; int error; error = copyin(uap->u_fhp, &fh, sizeof(fhandle_t)); if (error) return (error); error = kern_fhstatfs(td, fh, &sf); if (error) return (error); return (copyout(&sf, uap->buf, sizeof(sf))); } int kern_fhstatfs(struct thread *td, fhandle_t fh, struct statfs *buf) { struct statfs *sp; struct mount *mp; struct vnode *vp; int vfslocked; int error; error = priv_check(td, PRIV_VFS_FHSTATFS); if (error) return (error); if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL) return (ESTALE); vfslocked = VFS_LOCK_GIANT(mp); error = VFS_FHTOVP(mp, &fh.fh_fid, &vp); if (error) { vfs_unbusy(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); } vput(vp); error = prison_canseemount(td->td_ucred, mp); if (error) goto out; #ifdef MAC error = mac_mount_check_stat(td->td_ucred, mp); if (error) goto out; #endif /* * Set these in case the underlying filesystem fails to do so. */ sp = &mp->mnt_stat; sp->f_version = STATFS_VERSION; sp->f_namemax = NAME_MAX; sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; error = VFS_STATFS(mp, sp); if (error == 0) *buf = *sp; out: vfs_unbusy(mp); VFS_UNLOCK_GIANT(vfslocked); return (error); }