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-rw-r--r--sys/kern/vfs_syscalls.c4729
1 files changed, 4729 insertions, 0 deletions
diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
new file mode 100644
index 0000000..3f2e523
--- /dev/null
+++ b/sys/kern/vfs_syscalls.c
@@ -0,0 +1,4729 @@
+/*-
+ * 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_capsicum.h"
+#include "opt_compat.h"
+#include "opt_kdtrace.h"
+#include "opt_ktrace.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bio.h>
+#include <sys/buf.h>
+#include <sys/capability.h>
+#include <sys/disk.h>
+#include <sys/sysent.h>
+#include <sys/malloc.h>
+#include <sys/mount.h>
+#include <sys/mutex.h>
+#include <sys/sysproto.h>
+#include <sys/namei.h>
+#include <sys/filedesc.h>
+#include <sys/kernel.h>
+#include <sys/fcntl.h>
+#include <sys/file.h>
+#include <sys/filio.h>
+#include <sys/limits.h>
+#include <sys/linker.h>
+#include <sys/sdt.h>
+#include <sys/stat.h>
+#include <sys/sx.h>
+#include <sys/unistd.h>
+#include <sys/vnode.h>
+#include <sys/priv.h>
+#include <sys/proc.h>
+#include <sys/dirent.h>
+#include <sys/jail.h>
+#include <sys/syscallsubr.h>
+#include <sys/sysctl.h>
+#ifdef KTRACE
+#include <sys/ktrace.h>
+#endif
+
+#include <machine/stdarg.h>
+
+#include <security/audit/audit.h>
+#include <security/mac/mac_framework.h>
+
+#include <vm/vm.h>
+#include <vm/vm_object.h>
+#include <vm/vm_page.h>
+#include <vm/uma.h>
+
+#include <ufs/ufs/quota.h>
+
+MALLOC_DEFINE(M_FADVISE, "fadvise", "posix_fadvise(2) information");
+
+SDT_PROVIDER_DEFINE(vfs);
+SDT_PROBE_DEFINE(vfs, , stat, mode, mode);
+SDT_PROBE_ARGTYPE(vfs, , stat, mode, 0, "char *");
+SDT_PROBE_ARGTYPE(vfs, , stat, mode, 1, "int");
+SDT_PROBE_DEFINE(vfs, , stat, reg, 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 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
+sys_sync(td, uap)
+ struct thread *td;
+ struct sync_args *uap;
+{
+ struct mount *mp, *nmp;
+ int save;
+
+ 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;
+ }
+ if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
+ vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
+ save = curthread_pflags_set(TDP_SYNCIO);
+ vfs_msync(mp, MNT_NOWAIT);
+ VFS_SYNC(mp, MNT_NOWAIT);
+ curthread_pflags_restore(save);
+ vn_finished_write(mp);
+ }
+ 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
+sys_quotactl(td, uap)
+ struct thread *td;
+ register struct quotactl_args /* {
+ char *path;
+ int cmd;
+ int uid;
+ caddr_t arg;
+ } */ *uap;
+{
+ struct mount *mp;
+ 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 | AUDITVNODE1,
+ UIO_USERSPACE, uap->path, td);
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ 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)
+ return (error);
+ error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg);
+
+ /*
+ * Since quota on operation typically needs to open quota
+ * file, the Q_QUOTAON handler needs to unbusy the mount point
+ * before calling into namei. Otherwise, unmount might be
+ * started between two vfs_busy() invocations (first is our,
+ * second is from mount point cross-walk code in lookup()),
+ * causing deadlock.
+ *
+ * Require that Q_QUOTAON handles the vfs_busy() reference on
+ * its own, always returning with ubusied mount point.
+ */
+ if ((uap->cmd >> SUBCMDSHIFT) != Q_QUOTAON)
+ vfs_unbusy(mp);
+ 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
+sys_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 error;
+ struct nameidata nd;
+
+ NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF |
+ AUDITVNODE1, pathseg, path, td);
+ error = namei(&nd);
+ if (error)
+ return (error);
+ 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)
+ 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);
+ return (error);
+}
+
+/*
+ * Get filesystem statistics.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct fstatfs_args {
+ int fd;
+ struct statfs *buf;
+};
+#endif
+int
+sys_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;
+ struct vnode *vp;
+ int error;
+
+ AUDIT_ARG_FD(fd);
+ error = getvnode(td->td_proc->p_fd, fd, CAP_FSTATFS, &fp);
+ if (error)
+ return (error);
+ vp = fp->f_vnode;
+ 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)
+ 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);
+ return (error);
+}
+
+/*
+ * Get statistics on all filesystems.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct getfsstat_args {
+ struct statfs *buf;
+ long bufsize;
+ int flags;
+};
+#endif
+int
+sys_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 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;
+ }
+ 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))) {
+ 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);
+ return (error);
+ }
+ }
+ sfsp++;
+ }
+ 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
+sys_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 error;
+
+ AUDIT_ARG_FD(uap->fd);
+ if ((error = getvnode(fdp, uap->fd, CAP_FCHDIR, &fp)) != 0)
+ return (error);
+ vp = fp->f_vnode;
+ VREF(vp);
+ fdrop(fp, td);
+ vn_lock(vp, LK_SHARED | LK_RETRY);
+ AUDIT_ARG_VNODE1(vp);
+ error = change_dir(vp, td);
+ while (!error && (mp = vp->v_mountedhere) != NULL) {
+ if (vfs_busy(mp, 0))
+ continue;
+ error = VFS_ROOT(mp, LK_SHARED, &tdp);
+ vfs_unbusy(mp);
+ if (error)
+ break;
+ vput(vp);
+ vp = tdp;
+ }
+ if (error) {
+ vput(vp);
+ return (error);
+ }
+ VOP_UNLOCK(vp, 0);
+ FILEDESC_XLOCK(fdp);
+ vpold = fdp->fd_cdir;
+ fdp->fd_cdir = vp;
+ FILEDESC_XUNLOCK(fdp);
+ vrele(vpold);
+ return (0);
+}
+
+/*
+ * Change current working directory (``.'').
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct chdir_args {
+ char *path;
+};
+#endif
+int
+sys_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;
+
+ NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1,
+ pathseg, path, td);
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ if ((error = change_dir(nd.ni_vp, td)) != 0) {
+ vput(nd.ni_vp);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ return (error);
+ }
+ VOP_UNLOCK(nd.ni_vp, 0);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ FILEDESC_XLOCK(fdp);
+ vp = fdp->fd_cdir;
+ fdp->fd_cdir = nd.ni_vp;
+ FILEDESC_XUNLOCK(fdp);
+ vrele(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 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,
+ "Allow a process to chroot(2) if it has a directory open");
+
+/*
+ * Change notion of root (``/'') directory.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct chroot_args {
+ char *path;
+};
+#endif
+int
+sys_chroot(td, uap)
+ struct thread *td;
+ struct chroot_args /* {
+ char *path;
+ } */ *uap;
+{
+ int error;
+ struct nameidata nd;
+
+ error = priv_check(td, PRIV_VFS_CHROOT);
+ if (error)
+ return (error);
+ NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF |
+ AUDITVNODE1, UIO_USERSPACE, uap->path, td);
+ error = namei(&nd);
+ if (error)
+ goto error;
+ 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);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ return (error);
+e_vunlock:
+ vput(nd.ni_vp);
+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 error;
+
+ 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);
+ vrele(oldvp);
+ return (0);
+}
+
+static __inline cap_rights_t
+flags_to_rights(int flags)
+{
+ cap_rights_t rights = 0;
+
+ if (flags & O_EXEC) {
+ rights |= CAP_FEXECVE;
+ } else {
+ switch ((flags & O_ACCMODE)) {
+ case O_RDONLY:
+ rights |= CAP_READ;
+ break;
+ case O_RDWR:
+ rights |= CAP_READ;
+ /* FALLTHROUGH */
+ case O_WRONLY:
+ rights |= CAP_WRITE;
+ break;
+ }
+ }
+
+ if (flags & O_CREAT)
+ rights |= CAP_CREATE;
+
+ if (flags & O_TRUNC)
+ rights |= CAP_FTRUNCATE;
+
+ if ((flags & O_EXLOCK) || (flags & O_SHLOCK))
+ rights |= CAP_FLOCK;
+
+ return (rights);
+}
+
+/*
+ * 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
+sys_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
+sys_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;
+ int indx = -1, error;
+ struct nameidata nd;
+ cap_rights_t rights_needed = CAP_LOOKUP;
+
+ AUDIT_ARG_FFLAGS(flags);
+ AUDIT_ARG_MODE(mode);
+ /* XXX: audit dirfd */
+ rights_needed |= flags_to_rights(flags);
+ /*
+ * Only one of the O_EXEC, O_RDONLY, O_WRONLY and O_RDWR flags
+ * 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);
+ }
+
+ /*
+ * Allocate the file descriptor, but don't install a descriptor yet.
+ */
+ error = falloc_noinstall(td, &fp);
+ if (error)
+ return (error);
+ /*
+ * An extra reference on `fp' has been held for us by
+ * falloc_noinstall().
+ */
+ /* 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_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg,
+ path, fd, rights_needed, 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)
+ goto success;
+
+ /*
+ * Handle special fdopen() case. bleh.
+ *
+ * Don't do this for relative (capability) lookups; we don't
+ * understand exactly what would happen, and we don't think
+ * that it ever should.
+ */
+ if (nd.ni_strictrelative == 0 &&
+ (error == ENODEV || error == ENXIO) &&
+ td->td_dupfd >= 0) {
+ error = dupfdopen(td, fdp, td->td_dupfd, flags, error,
+ &indx);
+ if (error == 0)
+ goto success;
+ }
+
+ if (error == ERESTART)
+ error = EINTR;
+ goto bad_unlocked;
+ }
+ td->td_dupfd = 0;
+ 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) | (fp->f_flag & FHASLOCK), DTYPE_VNODE,
+ vp, &vnops);
+ }
+
+ VOP_UNLOCK(vp, 0);
+ if (flags & O_TRUNC) {
+ error = fo_truncate(fp, 0, td->td_ucred, td);
+ if (error)
+ goto bad;
+ }
+success:
+ /*
+ * If we haven't already installed the FD (for dupfdopen), do so now.
+ */
+ if (indx == -1) {
+#ifdef CAPABILITIES
+ if (nd.ni_strictrelative == 1) {
+ /*
+ * We are doing a strict relative lookup; wrap the
+ * result in a capability.
+ */
+ if ((error = kern_capwrap(td, fp, nd.ni_baserights,
+ &indx)) != 0)
+ goto bad_unlocked;
+ } else
+#endif
+ if ((error = finstall(td, fp, &indx, flags)) != 0)
+ goto bad_unlocked;
+
+ }
+
+ /*
+ * Release our private reference, leaving the one associated with
+ * the descriptor table intact.
+ */
+ fdrop(fp, td);
+ td->td_retval[0] = indx;
+ return (0);
+bad:
+bad_unlocked:
+ KASSERT(indx == -1, ("indx=%d, should be -1", indx));
+ 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
+sys_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
+sys_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;
+
+ 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_ATRIGHTS(&nd, CREATE,
+ LOCKPARENT | SAVENAME | AUDITVNODE1, pathseg, path, fd,
+ CAP_MKNOD, td);
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ 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);
+ 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);
+ 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);
+ return (error);
+}
+
+/*
+ * Create a named pipe.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct mkfifo_args {
+ char *path;
+ int mode;
+};
+#endif
+int
+sys_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
+sys_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;
+
+ AUDIT_ARG_MODE(mode);
+restart:
+ bwillwrite();
+ NDINIT_ATRIGHTS(&nd, CREATE,
+ LOCKPARENT | SAVENAME | AUDITVNODE1, pathseg, path, fd,
+ CAP_MKFIFO, td);
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ 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);
+ return (EEXIST);
+ }
+ if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ vput(nd.ni_dvp);
+ 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);
+ 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
+sys_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
+sys_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 error;
+
+ bwillwrite();
+ NDINIT_AT(&nd, LOOKUP, follow | AUDITVNODE1, segflg, path1,
+ fd1, td);
+
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ vp = nd.ni_vp;
+ if (vp->v_type == VDIR) {
+ vrele(vp);
+ return (EPERM); /* POSIX */
+ }
+ if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
+ vrele(vp);
+ return (error);
+ }
+ NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME |
+ AUDITVNODE2, segflg, path2, fd2, CAP_CREATE, td);
+ if ((error = namei(&nd)) == 0) {
+ 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);
+ }
+ vrele(vp);
+ vn_finished_write(mp);
+ return (error);
+}
+
+/*
+ * Make a symbolic link.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct symlink_args {
+ char *path;
+ char *link;
+};
+#endif
+int
+sys_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
+sys_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;
+
+ 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_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME |
+ AUDITVNODE1, segflg, path2, fd, CAP_CREATE, td);
+ if ((error = namei(&nd)) != 0)
+ goto out;
+ 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);
+ error = EEXIST;
+ goto out;
+ }
+ if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ vput(nd.ni_dvp);
+ 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);
+out:
+ if (segflg != UIO_SYSSPACE)
+ uma_zfree(namei_zone, syspath);
+ return (error);
+}
+
+/*
+ * Delete a whiteout from the filesystem.
+ */
+int
+sys_undelete(td, uap)
+ struct thread *td;
+ register struct undelete_args /* {
+ char *path;
+ } */ *uap;
+{
+ int error;
+ struct mount *mp;
+ struct nameidata nd;
+
+restart:
+ bwillwrite();
+ NDINIT(&nd, DELETE, LOCKPARENT | DOWHITEOUT | AUDITVNODE1,
+ UIO_USERSPACE, uap->path, td);
+ error = namei(&nd);
+ if (error)
+ return (error);
+
+ 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);
+ return (EEXIST);
+ }
+ if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ vput(nd.ni_dvp);
+ 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);
+ return (error);
+}
+
+/*
+ * Delete a name from the filesystem.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct unlink_args {
+ char *path;
+};
+#endif
+int
+sys_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
+sys_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, 0));
+}
+
+int
+kern_unlink(struct thread *td, char *path, enum uio_seg pathseg)
+{
+
+ return (kern_unlinkat(td, AT_FDCWD, path, pathseg, 0));
+}
+
+int
+kern_unlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
+ ino_t oldinum)
+{
+ struct mount *mp;
+ struct vnode *vp;
+ int error;
+ struct nameidata nd;
+ struct stat sb;
+
+restart:
+ bwillwrite();
+ NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF |
+ AUDITVNODE1, pathseg, path, fd, CAP_DELETE, td);
+ if ((error = namei(&nd)) != 0)
+ return (error == EINVAL ? EPERM : error);
+ vp = nd.ni_vp;
+ if (vp->v_type == VDIR && oldinum == 0) {
+ error = EPERM; /* POSIX */
+ } else if (oldinum != 0 &&
+ ((error = vn_stat(vp, &sb, td->td_ucred, NOCRED, td)) == 0) &&
+ sb.st_ino != oldinum) {
+ error = EIDRM; /* Identifier removed */
+ } 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);
+ 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);
+ 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
+sys_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 foffset, offset, size;
+ int error, noneg;
+
+ AUDIT_ARG_FD(uap->fd);
+ if ((error = fget(td, uap->fd, CAP_SEEK, &fp)) != 0)
+ return (error);
+ if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE)) {
+ fdrop(fp, td);
+ return (ESPIPE);
+ }
+ vp = fp->f_vnode;
+ foffset = foffset_lock(fp, 0);
+ noneg = (vp->v_type != VCHR);
+ offset = uap->offset;
+ switch (uap->whence) {
+ case L_INCR:
+ if (noneg &&
+ (foffset < 0 ||
+ (offset > 0 && foffset > OFF_MAX - offset))) {
+ error = EOVERFLOW;
+ break;
+ }
+ offset += foffset;
+ 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;
+ VFS_KNOTE_UNLOCKED(vp, 0);
+ *(off_t *)(td->td_retval) = offset;
+drop:
+ fdrop(fp, td);
+ foffset_unlock(fp, offset, error != 0 ? FOF_NOUPDATE : 0);
+ 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 (sys_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 (sys_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 amode;
+};
+#endif
+int
+sys_access(td, uap)
+ struct thread *td;
+ register struct access_args /* {
+ char *path;
+ int amode;
+ } */ *uap;
+{
+
+ return (kern_access(td, uap->path, UIO_USERSPACE, uap->amode));
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct faccessat_args {
+ int dirfd;
+ char *path;
+ int amode;
+ int flag;
+}
+#endif
+int
+sys_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->amode));
+}
+
+int
+kern_access(struct thread *td, char *path, enum uio_seg pathseg, int amode)
+{
+
+ return (kern_accessat(td, AT_FDCWD, path, pathseg, 0, amode));
+}
+
+int
+kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
+ int flag, int amode)
+{
+ struct ucred *cred, *tmpcred;
+ struct vnode *vp;
+ struct nameidata nd;
+ int error;
+
+ /*
+ * Create and modify a temporary credential instead of one that
+ * is potentially shared.
+ */
+ if (!(flag & 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(amode);
+ NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF |
+ AUDITVNODE1, pathseg, path, fd, CAP_FSTAT, td);
+ if ((error = namei(&nd)) != 0)
+ goto out1;
+ vp = nd.ni_vp;
+
+ error = vn_access(vp, amode, tmpcred, td);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ vput(vp);
+out1:
+ if (!(flag & 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 amode;
+};
+#endif
+int
+sys_eaccess(td, uap)
+ struct thread *td;
+ register struct eaccess_args /* {
+ char *path;
+ int amode;
+ } */ *uap;
+{
+
+ return (kern_eaccess(td, uap->path, UIO_USERSPACE, uap->amode));
+}
+
+int
+kern_eaccess(struct thread *td, char *path, enum uio_seg pathseg, int amode)
+{
+
+ return (kern_accessat(td, AT_FDCWD, path, pathseg, AT_EACCESS, amode));
+}
+
+#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_atim = st->st_atim;
+ ost->st_mtim = st->st_mtim;
+ ost->st_ctim = st->st_ctim;
+ 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
+sys_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
+sys_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;
+
+ if (flag & ~AT_SYMLINK_NOFOLLOW)
+ return (EINVAL);
+
+ NDINIT_ATRIGHTS(&nd, LOOKUP, ((flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW :
+ FOLLOW) | LOCKSHARED | LOCKLEAF | AUDITVNODE1, pathseg,
+ path, fd, CAP_FSTAT, td);
+
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ 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);
+ 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
+sys_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_atim = sb->st_atim;
+ nsb->st_mtim = sb->st_mtim;
+ nsb->st_ctim = sb->st_ctim;
+ 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_birthtim = sb->st_birthtim;
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct nstat_args {
+ char *path;
+ struct nstat *ub;
+};
+#endif
+int
+sys_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
+sys_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
+sys_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
+sys_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;
+
+ NDINIT(&nd, LOOKUP, LOCKSHARED | LOCKLEAF | AUDITVNODE1 | flags,
+ pathseg, path, td);
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ 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);
+ 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
+sys_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
+sys_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;
+
+ if (count > IOSIZE_MAX)
+ return (EINVAL);
+
+ NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF |
+ AUDITVNODE1, pathseg, path, fd, td);
+
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ vp = nd.ni_vp;
+#ifdef MAC
+ error = mac_vnode_check_readlink(td->td_ucred, vp);
+ if (error) {
+ vput(vp);
+ 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);
+ 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;
+
+ /* We can't support the value matching VNOVAL. */
+ if (flags == VNOVAL)
+ return (EOPNOTSUPP);
+
+ /*
+ * 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
+sys_chflags(td, uap)
+ struct thread *td;
+ register struct chflags_args /* {
+ char *path;
+ int flags;
+ } */ *uap;
+{
+ int error;
+ struct nameidata nd;
+
+ AUDIT_ARG_FFLAGS(uap->flags);
+ NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, UIO_USERSPACE,
+ uap->path, td);
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ error = setfflags(td, nd.ni_vp, uap->flags);
+ vrele(nd.ni_vp);
+ return (error);
+}
+
+/*
+ * Same as chflags() but doesn't follow symlinks.
+ */
+int
+sys_lchflags(td, uap)
+ struct thread *td;
+ register struct lchflags_args /* {
+ char *path;
+ int flags;
+ } */ *uap;
+{
+ int error;
+ struct nameidata nd;
+
+ AUDIT_ARG_FFLAGS(uap->flags);
+ NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, UIO_USERSPACE,
+ uap->path, td);
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ error = setfflags(td, nd.ni_vp, 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
+int
+sys_fchflags(td, uap)
+ struct thread *td;
+ register struct fchflags_args /* {
+ int fd;
+ int flags;
+ } */ *uap;
+{
+ struct file *fp;
+ int error;
+
+ AUDIT_ARG_FD(uap->fd);
+ AUDIT_ARG_FFLAGS(uap->flags);
+ if ((error = getvnode(td->td_proc->p_fd, uap->fd, CAP_FCHFLAGS,
+ &fp)) != 0)
+ return (error);
+#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);
+ fdrop(fp, td);
+ return (error);
+}
+
+/*
+ * Common implementation code for chmod(), lchmod() and fchmod().
+ */
+int
+setfmode(td, cred, vp, mode)
+ struct thread *td;
+ struct ucred *cred;
+ 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(cred, vp, vattr.va_mode);
+ if (error == 0)
+#endif
+ error = VOP_SETATTR(vp, &vattr, cred);
+ 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
+sys_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
+sys_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
+sys_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 follow;
+
+ AUDIT_ARG_MODE(mode);
+ follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
+ NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg,
+ path, fd, CAP_FCHMOD, td);
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ error = setfmode(td, td->td_ucred, nd.ni_vp, 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
+int
+sys_fchmod(struct thread *td, struct fchmod_args *uap)
+{
+ struct file *fp;
+ int error;
+
+ AUDIT_ARG_FD(uap->fd);
+ AUDIT_ARG_MODE(uap->mode);
+
+ error = fget(td, uap->fd, CAP_FCHMOD, &fp);
+ if (error != 0)
+ return (error);
+ error = fo_chmod(fp, uap->mode, td->td_ucred, td);
+ fdrop(fp, td);
+ return (error);
+}
+
+/*
+ * Common implementation for chown(), lchown(), and fchown()
+ */
+int
+setfown(td, cred, vp, uid, gid)
+ struct thread *td;
+ struct ucred *cred;
+ 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(cred, vp, vattr.va_uid,
+ vattr.va_gid);
+ if (error == 0)
+#endif
+ error = VOP_SETATTR(vp, &vattr, cred);
+ 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
+sys_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
+sys_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, follow;
+
+ AUDIT_ARG_OWNER(uid, gid);
+ follow = (flag & AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
+ NDINIT_ATRIGHTS(&nd, LOOKUP, follow | AUDITVNODE1, pathseg,
+ path, fd, CAP_FCHOWN, td);
+
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ error = setfown(td, td->td_ucred, nd.ni_vp, uid, 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
+int
+sys_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
+sys_fchown(td, uap)
+ struct thread *td;
+ register struct fchown_args /* {
+ int fd;
+ int uid;
+ int gid;
+ } */ *uap;
+{
+ struct file *fp;
+ int error;
+
+ AUDIT_ARG_FD(uap->fd);
+ AUDIT_ARG_OWNER(uap->uid, uap->gid);
+ error = fget(td, uap->fd, CAP_FCHOWN, &fp);
+ if (error != 0)
+ return (error);
+ error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td);
+ 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
+sys_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
+sys_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;
+
+ if ((error = getutimes(tptr, tptrseg, ts)) != 0)
+ return (error);
+ NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg,
+ path, fd, CAP_FUTIMES, td);
+
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
+ 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
+int
+sys_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;
+
+ if ((error = getutimes(tptr, tptrseg, ts)) != 0)
+ return (error);
+ NDINIT(&nd, LOOKUP, NOFOLLOW | AUDITVNODE1, pathseg, path, td);
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ error = setutimes(td, nd.ni_vp, ts, 2, tptr == NULL);
+ 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
+int
+sys_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 error;
+
+ AUDIT_ARG_FD(fd);
+ if ((error = getutimes(tptr, tptrseg, ts)) != 0)
+ return (error);
+ if ((error = getvnode(td->td_proc->p_fd, fd, CAP_FUTIMES, &fp))
+ != 0)
+ return (error);
+#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);
+ 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
+sys_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;
+ void *rl_cookie;
+ struct vattr vattr;
+ struct nameidata nd;
+ int error;
+
+ if (length < 0)
+ return(EINVAL);
+ NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNODE1, pathseg, path, td);
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ vp = nd.ni_vp;
+ rl_cookie = vn_rangelock_wlock(vp, 0, OFF_MAX);
+ if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0) {
+ vn_rangelock_unlock(vp, rl_cookie);
+ vrele(vp);
+ 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);
+ }
+ VOP_UNLOCK(vp, 0);
+ vn_finished_write(mp);
+ vn_rangelock_unlock(vp, rl_cookie);
+ vrele(vp);
+ 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 (sys_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 (sys_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 (sys_ftruncate(td, &ouap));
+}
+
+/*
+ * Sync an open file.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct fsync_args {
+ int fd;
+};
+#endif
+int
+sys_fsync(td, uap)
+ struct thread *td;
+ struct fsync_args /* {
+ int fd;
+ } */ *uap;
+{
+ struct vnode *vp;
+ struct mount *mp;
+ struct file *fp;
+ int error, lock_flags;
+
+ AUDIT_ARG_FD(uap->fd);
+ if ((error = getvnode(td->td_proc->p_fd, uap->fd, CAP_FSYNC,
+ &fp)) != 0)
+ return (error);
+ vp = fp->f_vnode;
+ 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:
+ 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
+sys_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
+sys_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 error;
+
+ bwillwrite();
+#ifdef MAC
+ NDINIT_ATRIGHTS(&fromnd, DELETE, LOCKPARENT | LOCKLEAF | SAVESTART |
+ AUDITVNODE1, pathseg, old, oldfd, CAP_DELETE, td);
+#else
+ NDINIT_ATRIGHTS(&fromnd, DELETE, WANTPARENT | SAVESTART |
+ AUDITVNODE1, pathseg, old, oldfd, CAP_DELETE, td);
+#endif
+
+ if ((error = namei(&fromnd)) != 0)
+ return (error);
+#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_ATRIGHTS(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE |
+ SAVESTART | AUDITVNODE2, pathseg, new, newfd, CAP_CREATE,
+ 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;
+ }
+ 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);
+ if (error == -1)
+ return (0);
+ return (error);
+}
+
+/*
+ * Make a directory file.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct mkdir_args {
+ char *path;
+ int mode;
+};
+#endif
+int
+sys_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
+sys_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;
+
+ AUDIT_ARG_MODE(mode);
+restart:
+ bwillwrite();
+ NDINIT_ATRIGHTS(&nd, CREATE, LOCKPARENT | SAVENAME |
+ AUDITVNODE1, segflg, path, fd, CAP_MKDIR, td);
+ nd.ni_cnd.cn_flags |= WILLBEDIR;
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ 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);
+ return (EEXIST);
+ }
+ if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
+ NDFREE(&nd, NDF_ONLY_PNBUF);
+ vput(nd.ni_dvp);
+ 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);
+ return (error);
+}
+
+/*
+ * Remove a directory file.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct rmdir_args {
+ char *path;
+};
+#endif
+int
+sys_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;
+
+restart:
+ bwillwrite();
+ NDINIT_ATRIGHTS(&nd, DELETE, LOCKPARENT | LOCKLEAF |
+ AUDITVNODE1, pathseg, path, fd, CAP_RMDIR, td);
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ vp = nd.ni_vp;
+ if (vp->v_type != VDIR) {
+ error = ENOTDIR;
+ goto out;
+ }
+ /*
+ * No rmdir "." please.
+ */
+ if (nd.ni_dvp == vp) {
+ error = EINVAL;
+ goto out;
+ }
+ /*
+ * The root of a mounted filesystem cannot be deleted.
+ */
+ if (vp->v_vflag & VV_ROOT) {
+ 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);
+ 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);
+ 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(struct thread *td, struct ogetdirentries_args *uap)
+{
+ long loff;
+ int error;
+
+ error = kern_ogetdirentries(td, uap, &loff);
+ if (error == 0)
+ error = copyout(&loff, uap->basep, sizeof(long));
+ return (error);
+}
+
+int
+kern_ogetdirentries(struct thread *td, struct ogetdirentries_args *uap,
+ long *ploff)
+{
+ 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;
+ off_t foffset;
+
+ /* XXX arbitrary sanity limit on `count'. */
+ if (uap->count > 64 * 1024)
+ return (EINVAL);
+ if ((error = getvnode(td->td_proc->p_fd, uap->fd, CAP_READ,
+ &fp)) != 0)
+ return (error);
+ if ((fp->f_flag & FREAD) == 0) {
+ fdrop(fp, td);
+ return (EBADF);
+ }
+ vp = fp->f_vnode;
+ foffset = foffset_lock(fp, 0);
+unionread:
+ if (vp->v_type != VDIR) {
+ foffset_unlock(fp, foffset, 0);
+ 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 = foffset;
+#ifdef MAC
+ error = mac_vnode_check_readdir(td->td_ucred, vp);
+ if (error) {
+ VOP_UNLOCK(vp, 0);
+ foffset_unlock(fp, foffset, FOF_NOUPDATE);
+ 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);
+ foffset = 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);
+ foffset = 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);
+ foffset_unlock(fp, foffset, 0);
+ 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;
+ foffset = 0;
+ vput(tvp);
+ goto unionread;
+ }
+ VOP_UNLOCK(vp, 0);
+ foffset_unlock(fp, foffset, 0);
+ fdrop(fp, td);
+ td->td_retval[0] = uap->count - auio.uio_resid;
+ if (error == 0)
+ *ploff = loff;
+ 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
+sys_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,
+ NULL, UIO_USERSPACE);
+ 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, ssize_t *residp, enum uio_seg bufseg)
+{
+ struct vnode *vp;
+ struct file *fp;
+ struct uio auio;
+ struct iovec aiov;
+ long loff;
+ int error, eofflag;
+ off_t foffset;
+
+ AUDIT_ARG_FD(fd);
+ if (count > IOSIZE_MAX)
+ return (EINVAL);
+ auio.uio_resid = count;
+ if ((error = getvnode(td->td_proc->p_fd, fd, CAP_READ | CAP_SEEK,
+ &fp)) != 0)
+ return (error);
+ if ((fp->f_flag & FREAD) == 0) {
+ fdrop(fp, td);
+ return (EBADF);
+ }
+ vp = fp->f_vnode;
+ foffset = foffset_lock(fp, 0);
+unionread:
+ if (vp->v_type != VDIR) {
+ 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 = bufseg;
+ auio.uio_td = td;
+ vn_lock(vp, LK_SHARED | LK_RETRY);
+ AUDIT_ARG_VNODE1(vp);
+ loff = auio.uio_offset = foffset;
+#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);
+ foffset = auio.uio_offset;
+ if (error) {
+ VOP_UNLOCK(vp, 0);
+ 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;
+ foffset = 0;
+ vput(tvp);
+ goto unionread;
+ }
+ VOP_UNLOCK(vp, 0);
+ *basep = loff;
+ if (residp != NULL)
+ *residp = auio.uio_resid;
+ td->td_retval[0] = count - auio.uio_resid;
+fail:
+ foffset_unlock(fp, foffset, 0);
+ fdrop(fp, td);
+ return (error);
+}
+
+#ifndef _SYS_SYSPROTO_H_
+struct getdents_args {
+ int fd;
+ char *buf;
+ size_t count;
+};
+#endif
+int
+sys_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 (sys_getdirentries(td, &ap));
+}
+
+/*
+ * Set the mode mask for creation of filesystem nodes.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct umask_args {
+ int newmask;
+};
+#endif
+int
+sys_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
+sys_revoke(td, uap)
+ struct thread *td;
+ register struct revoke_args /* {
+ char *path;
+ } */ *uap;
+{
+ struct vnode *vp;
+ struct vattr vattr;
+ int error;
+ struct nameidata nd;
+
+ NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
+ UIO_USERSPACE, uap->path, td);
+ if ((error = namei(&nd)) != 0)
+ return (error);
+ 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);
+ return (error);
+}
+
+/*
+ * Convert a user file descriptor to a kernel file entry and check that, if it
+ * is a capability, the correct rights are present. A reference on the file
+ * entry is held upon returning.
+ */
+int
+getvnode(struct filedesc *fdp, int fd, cap_rights_t rights,
+ struct file **fpp)
+{
+ struct file *fp;
+#ifdef CAPABILITIES
+ struct file *fp_fromcap;
+ int error;
+#endif
+
+ if (fdp == NULL || (fp = fget_unlocked(fdp, fd)) == NULL)
+ return (EBADF);
+#ifdef CAPABILITIES
+ /*
+ * If the file descriptor is for a capability, test rights and use the
+ * file descriptor referenced by the capability.
+ */
+ error = cap_funwrap(fp, rights, &fp_fromcap);
+ if (error) {
+ fdrop(fp, curthread);
+ return (error);
+ }
+ if (fp != fp_fromcap) {
+ fhold(fp_fromcap);
+ fdrop(fp, curthread);
+ fp = fp_fromcap;
+ }
+#endif /* CAPABILITIES */
+
+ /*
+ * The file could be not of the vnode type, or it may be not
+ * yet fully initialized, in which case the f_vnode pointer
+ * may be set, but f_ops is still badfileops. E.g.,
+ * devfs_open() transiently create such situation to
+ * facilitate csw d_fdopen().
+ *
+ * Dupfdopen() handling in kern_openat() installs the
+ * half-baked file into the process descriptor table, allowing
+ * other thread to dereference it. Guard against the race by
+ * checking f_ops.
+ */
+ if (fp->f_vnode == NULL || fp->f_ops == &badfileops) {
+ fdrop(fp, curthread);
+ return (EINVAL);
+ }
+ *fpp = fp;
+ return (0);
+}
+
+
+/*
+ * Get an (NFS) file handle.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct lgetfh_args {
+ char *fname;
+ fhandle_t *fhp;
+};
+#endif
+int
+sys_lgetfh(td, uap)
+ struct thread *td;
+ register struct lgetfh_args *uap;
+{
+ struct nameidata nd;
+ fhandle_t fh;
+ register struct vnode *vp;
+ int error;
+
+ error = priv_check(td, PRIV_VFS_GETFH);
+ if (error)
+ return (error);
+ NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | AUDITVNODE1,
+ UIO_USERSPACE, uap->fname, td);
+ error = namei(&nd);
+ if (error)
+ return (error);
+ 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);
+ 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
+sys_getfh(td, uap)
+ struct thread *td;
+ register struct getfh_args *uap;
+{
+ struct nameidata nd;
+ fhandle_t fh;
+ register struct vnode *vp;
+ int error;
+
+ error = priv_check(td, PRIV_VFS_GETFH);
+ if (error)
+ return (error);
+ NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
+ UIO_USERSPACE, uap->fname, td);
+ error = namei(&nd);
+ if (error)
+ return (error);
+ 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);
+ 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
+sys_fhopen(td, uap)
+ struct thread *td;
+ struct fhopen_args /* {
+ const struct fhandle *u_fhp;
+ int flags;
+ } */ *uap;
+{
+ struct mount *mp;
+ struct vnode *vp;
+ struct fhandle fhp;
+ struct file *fp;
+ int fmode, error;
+ int indx;
+
+ error = priv_check(td, PRIV_VFS_FHOPEN);
+ if (error)
+ return (error);
+ indx = -1;
+ 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);
+ /* now give me my vnode, it gets returned to me locked */
+ error = VFS_FHTOVP(mp, &fhp.fh_fid, LK_EXCLUSIVE, &vp);
+ vfs_unbusy(mp);
+ if (error)
+ return (error);
+
+ error = falloc_noinstall(td, &fp);
+ if (error) {
+ vput(vp);
+ return (error);
+ }
+ /*
+ * An extra reference on `fp' has been held for us by
+ * falloc_noinstall().
+ */
+
+#ifdef INVARIANTS
+ td->td_dupfd = -1;
+#endif
+ error = vn_open_vnode(vp, fmode, td->td_ucred, td, fp);
+ if (error) {
+ KASSERT(fp->f_ops == &badfileops,
+ ("VOP_OPEN in fhopen() set f_ops"));
+ KASSERT(td->td_dupfd < 0,
+ ("fhopen() encountered fdopen()"));
+
+ vput(vp);
+ goto bad;
+ }
+#ifdef INVARIANTS
+ td->td_dupfd = 0;
+#endif
+ fp->f_vnode = vp;
+ fp->f_seqcount = 1;
+ finit(fp, (fmode & FMASK) | (fp->f_flag & FHASLOCK), DTYPE_VNODE, vp,
+ &vnops);
+ VOP_UNLOCK(vp, 0);
+ if (fmode & O_TRUNC) {
+ error = fo_truncate(fp, 0, td->td_ucred, td);
+ if (error)
+ goto bad;
+ }
+
+ error = finstall(td, fp, &indx, fmode);
+bad:
+ fdrop(fp, td);
+ td->td_retval[0] = indx;
+ return (error);
+}
+
+/*
+ * Stat an (NFS) file handle.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct fhstat_args {
+ struct fhandle *u_fhp;
+ struct stat *sb;
+};
+#endif
+int
+sys_fhstat(td, uap)
+ struct thread *td;
+ register struct fhstat_args /* {
+ struct fhandle *u_fhp;
+ struct stat *sb;
+ } */ *uap;
+{
+ struct stat sb;
+ struct fhandle fh;
+ int error;
+
+ error = copyin(uap->u_fhp, &fh, sizeof(fh));
+ if (error != 0)
+ return (error);
+ error = kern_fhstat(td, fh, &sb);
+ if (error != 0)
+ return (error);
+ error = copyout(&sb, uap->sb, sizeof(sb));
+ return (error);
+}
+
+int
+kern_fhstat(struct thread *td, struct fhandle fh, struct stat *sb)
+{
+ struct mount *mp;
+ struct vnode *vp;
+ int error;
+
+ error = priv_check(td, PRIV_VFS_FHSTAT);
+ if (error)
+ return (error);
+ if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
+ return (ESTALE);
+ error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
+ vfs_unbusy(mp);
+ if (error)
+ return (error);
+ error = vn_stat(vp, sb, td->td_ucred, NOCRED, td);
+ vput(vp);
+ return (error);
+}
+
+/*
+ * Implement fstatfs() for (NFS) file handles.
+ */
+#ifndef _SYS_SYSPROTO_H_
+struct fhstatfs_args {
+ struct fhandle *u_fhp;
+ struct statfs *buf;
+};
+#endif
+int
+sys_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 error;
+
+ error = priv_check(td, PRIV_VFS_FHSTATFS);
+ if (error)
+ return (error);
+ if ((mp = vfs_busyfs(&fh.fh_fsid)) == NULL)
+ return (ESTALE);
+ error = VFS_FHTOVP(mp, &fh.fh_fid, LK_EXCLUSIVE, &vp);
+ if (error) {
+ vfs_unbusy(mp);
+ 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);
+ return (error);
+}
+
+int
+kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len)
+{
+ struct file *fp;
+ struct mount *mp;
+ struct vnode *vp;
+ off_t olen, ooffset;
+ int error;
+
+ fp = NULL;
+ error = fget(td, fd, CAP_WRITE, &fp);
+ if (error != 0)
+ goto out;
+
+ switch (fp->f_type) {
+ case DTYPE_VNODE:
+ break;
+ case DTYPE_PIPE:
+ case DTYPE_FIFO:
+ error = ESPIPE;
+ goto out;
+ default:
+ error = ENODEV;
+ goto out;
+ }
+ if ((fp->f_flag & FWRITE) == 0) {
+ error = EBADF;
+ goto out;
+ }
+ vp = fp->f_vnode;
+ if (vp->v_type != VREG) {
+ error = ENODEV;
+ goto out;
+ }
+ if (offset < 0 || len <= 0) {
+ error = EINVAL;
+ goto out;
+ }
+ /* Check for wrap. */
+ if (offset > OFF_MAX - len) {
+ error = EFBIG;
+ goto out;
+ }
+
+ /* Allocating blocks may take a long time, so iterate. */
+ for (;;) {
+ olen = len;
+ ooffset = offset;
+
+ bwillwrite();
+ mp = NULL;
+ error = vn_start_write(vp, &mp, V_WAIT | PCATCH);
+ if (error != 0)
+ break;
+ error = vn_lock(vp, LK_EXCLUSIVE);
+ if (error != 0) {
+ vn_finished_write(mp);
+ break;
+ }
+#ifdef MAC
+ error = mac_vnode_check_write(td->td_ucred, fp->f_cred, vp);
+ if (error == 0)
+#endif
+ error = VOP_ALLOCATE(vp, &offset, &len);
+ VOP_UNLOCK(vp, 0);
+ vn_finished_write(mp);
+
+ if (olen + ooffset != offset + len) {
+ panic("offset + len changed from %jx/%jx to %jx/%jx",
+ ooffset, olen, offset, len);
+ }
+ if (error != 0 || len == 0)
+ break;
+ KASSERT(olen > len, ("Iteration did not make progress?"));
+ maybe_yield();
+ }
+ out:
+ if (fp != NULL)
+ fdrop(fp, td);
+ return (error);
+}
+
+int
+sys_posix_fallocate(struct thread *td, struct posix_fallocate_args *uap)
+{
+
+ return (kern_posix_fallocate(td, uap->fd, uap->offset, uap->len));
+}
+
+/*
+ * Unlike madvise(2), we do not make a best effort to remember every
+ * possible caching hint. Instead, we remember the last setting with
+ * the exception that we will allow POSIX_FADV_NORMAL to adjust the
+ * region of any current setting.
+ */
+int
+kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len,
+ int advice)
+{
+ struct fadvise_info *fa, *new;
+ struct file *fp;
+ struct vnode *vp;
+ off_t end;
+ int error;
+
+ if (offset < 0 || len < 0 || offset > OFF_MAX - len)
+ return (EINVAL);
+ switch (advice) {
+ case POSIX_FADV_SEQUENTIAL:
+ case POSIX_FADV_RANDOM:
+ case POSIX_FADV_NOREUSE:
+ new = malloc(sizeof(*fa), M_FADVISE, M_WAITOK);
+ break;
+ case POSIX_FADV_NORMAL:
+ case POSIX_FADV_WILLNEED:
+ case POSIX_FADV_DONTNEED:
+ new = NULL;
+ break;
+ default:
+ return (EINVAL);
+ }
+ /* XXX: CAP_POSIX_FADVISE? */
+ error = fget(td, fd, 0, &fp);
+ if (error != 0)
+ goto out;
+
+ switch (fp->f_type) {
+ case DTYPE_VNODE:
+ break;
+ case DTYPE_PIPE:
+ case DTYPE_FIFO:
+ error = ESPIPE;
+ goto out;
+ default:
+ error = ENODEV;
+ goto out;
+ }
+ vp = fp->f_vnode;
+ if (vp->v_type != VREG) {
+ error = ENODEV;
+ goto out;
+ }
+ if (len == 0)
+ end = OFF_MAX;
+ else
+ end = offset + len - 1;
+ switch (advice) {
+ case POSIX_FADV_SEQUENTIAL:
+ case POSIX_FADV_RANDOM:
+ case POSIX_FADV_NOREUSE:
+ /*
+ * Try to merge any existing non-standard region with
+ * this new region if possible, otherwise create a new
+ * non-standard region for this request.
+ */
+ mtx_pool_lock(mtxpool_sleep, fp);
+ fa = fp->f_advice;
+ if (fa != NULL && fa->fa_advice == advice &&
+ ((fa->fa_start <= end && fa->fa_end >= offset) ||
+ (end != OFF_MAX && fa->fa_start == end + 1) ||
+ (fa->fa_end != OFF_MAX && fa->fa_end + 1 == offset))) {
+ if (offset < fa->fa_start)
+ fa->fa_start = offset;
+ if (end > fa->fa_end)
+ fa->fa_end = end;
+ } else {
+ new->fa_advice = advice;
+ new->fa_start = offset;
+ new->fa_end = end;
+ new->fa_prevstart = 0;
+ new->fa_prevend = 0;
+ fp->f_advice = new;
+ new = fa;
+ }
+ mtx_pool_unlock(mtxpool_sleep, fp);
+ break;
+ case POSIX_FADV_NORMAL:
+ /*
+ * If a the "normal" region overlaps with an existing
+ * non-standard region, trim or remove the
+ * non-standard region.
+ */
+ mtx_pool_lock(mtxpool_sleep, fp);
+ fa = fp->f_advice;
+ if (fa != NULL) {
+ if (offset <= fa->fa_start && end >= fa->fa_end) {
+ new = fa;
+ fp->f_advice = NULL;
+ } else if (offset <= fa->fa_start &&
+ end >= fa->fa_start)
+ fa->fa_start = end + 1;
+ else if (offset <= fa->fa_end && end >= fa->fa_end)
+ fa->fa_end = offset - 1;
+ else if (offset >= fa->fa_start && end <= fa->fa_end) {
+ /*
+ * If the "normal" region is a middle
+ * portion of the existing
+ * non-standard region, just remove
+ * the whole thing rather than picking
+ * one side or the other to
+ * preserve.
+ */
+ new = fa;
+ fp->f_advice = NULL;
+ }
+ }
+ mtx_pool_unlock(mtxpool_sleep, fp);
+ break;
+ case POSIX_FADV_WILLNEED:
+ case POSIX_FADV_DONTNEED:
+ error = VOP_ADVISE(vp, offset, end, advice);
+ break;
+ }
+out:
+ if (fp != NULL)
+ fdrop(fp, td);
+ free(new, M_FADVISE);
+ return (error);
+}
+
+int
+sys_posix_fadvise(struct thread *td, struct posix_fadvise_args *uap)
+{
+
+ return (kern_posix_fadvise(td, uap->fd, uap->offset, uap->len,
+ uap->advice));
+}
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