FreeBSD/Linux Kernel Cross Reference
sys/security/mac/mac_vfs.c

     /*-
      * Copyright (c) 1999-2002, 2009 Robert N. M. Watson
      * Copyright (c) 2001 Ilmar S. Habibulin
      * Copyright (c) 2001-2005 McAfee, Inc.
      * Copyright (c) 2005-2006 SPARTA, Inc.
      * Copyright (c) 2008 Apple Inc.
      * All rights reserved.
      *
      * This software was developed by Robert Watson and Ilmar Habibulin for the
     * TrustedBSD Project.
     *
     * This software was developed for the FreeBSD Project in part by McAfee
     * Research, the Security Research Division of McAfee, Inc. under
     * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
     * CHATS research program.
     *
     * This software was enhanced by SPARTA ISSO under SPAWAR contract
     * N66001-04-C-6019 ("SEFOS").
     *
     * This software was developed at the University of Cambridge Computer
     * Laboratory with support from a grant from Google, 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include "opt_mac.h"
    
    #include <sys/param.h>
    #include <sys/condvar.h>
    #include <sys/extattr.h>
    #include <sys/imgact.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    #include <sys/proc.h>
    #include <sys/sbuf.h>
    #include <sys/systm.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/file.h>
    #include <sys/namei.h>
    #include <sys/sdt.h>
    #include <sys/sysctl.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    #include <vm/vm_map.h>
    #include <vm/vm_object.h>
    
    #include <fs/devfs/devfs.h>
    
    #include <security/mac/mac_framework.h>
    #include <security/mac/mac_internal.h>
    #include <security/mac/mac_policy.h>
    
    /*
     * Warn about EA transactions only the first time they happen.  No locking on
     * this variable.
     */
    static int      ea_warn_once = 0;
    
    static int      mac_vnode_setlabel_extattr(struct ucred *cred,
                        struct vnode *vp, struct label *intlabel);
    
    static struct label *
    mac_devfs_label_alloc(void)
    {
            struct label *label;
    
            label = mac_labelzone_alloc(M_WAITOK);
            MAC_POLICY_PERFORM(devfs_init_label, label);
            return (label);
    }
    
    void
    mac_devfs_init(struct devfs_dirent *de)
   {
   
           if (mac_labeled & MPC_OBJECT_DEVFS)
                   de->de_label = mac_devfs_label_alloc();
           else
                   de->de_label = NULL;
   }
   
   static struct label *
   mac_mount_label_alloc(void)
   {
           struct label *label;
   
           label = mac_labelzone_alloc(M_WAITOK);
           MAC_POLICY_PERFORM(mount_init_label, label);
           return (label);
   }
   
   void
   mac_mount_init(struct mount *mp)
   {
   
           if (mac_labeled & MPC_OBJECT_MOUNT)
                   mp->mnt_label = mac_mount_label_alloc();
           else
                   mp->mnt_label = NULL;
   }
   
   struct label *
   mac_vnode_label_alloc(void)
   {
           struct label *label;
   
           label = mac_labelzone_alloc(M_WAITOK);
           MAC_POLICY_PERFORM(vnode_init_label, label);
           return (label);
   }
   
   void
   mac_vnode_init(struct vnode *vp)
   {
   
           if (mac_labeled & MPC_OBJECT_VNODE)
                   vp->v_label = mac_vnode_label_alloc();
           else
                   vp->v_label = NULL;
   }
   
   static void
   mac_devfs_label_free(struct label *label)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(devfs_destroy_label, label);
           mac_labelzone_free(label);
   }
   
   void
   mac_devfs_destroy(struct devfs_dirent *de)
   {
   
           if (de->de_label != NULL) {
                   mac_devfs_label_free(de->de_label);
                   de->de_label = NULL;
           }
   }
   
   static void
   mac_mount_label_free(struct label *label)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(mount_destroy_label, label);
           mac_labelzone_free(label);
   }
   
   void
   mac_mount_destroy(struct mount *mp)
   {
   
           if (mp->mnt_label != NULL) {
                   mac_mount_label_free(mp->mnt_label);
                   mp->mnt_label = NULL;
           }
   }
   
   void
   mac_vnode_label_free(struct label *label)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(vnode_destroy_label, label);
           mac_labelzone_free(label);
   }
   
   void
   mac_vnode_destroy(struct vnode *vp)
   {
   
           if (vp->v_label != NULL) {
                   mac_vnode_label_free(vp->v_label);
                   vp->v_label = NULL;
           }
   }
   
   void
   mac_vnode_copy_label(struct label *src, struct label *dest)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(vnode_copy_label, src, dest);
   }
   
   int
   mac_vnode_externalize_label(struct label *label, char *elements,
       char *outbuf, size_t outbuflen)
   {
           int error;
   
           MAC_POLICY_EXTERNALIZE(vnode, label, elements, outbuf, outbuflen);
   
           return (error);
   }
   
   int
   mac_vnode_internalize_label(struct label *label, char *string)
   {
           int error;
   
           MAC_POLICY_INTERNALIZE(vnode, label, string);
   
           return (error);
   }
   
   void
   mac_devfs_update(struct mount *mp, struct devfs_dirent *de, struct vnode *vp)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(devfs_update, mp, de, de->de_label, vp,
               vp->v_label);
   }
   
   void
   mac_devfs_vnode_associate(struct mount *mp, struct devfs_dirent *de,
       struct vnode *vp)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(devfs_vnode_associate, mp, mp->mnt_label,
               de, de->de_label, vp, vp->v_label);
   }
   
   int
   mac_vnode_associate_extattr(struct mount *mp, struct vnode *vp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_associate_extattr");
   
           MAC_POLICY_CHECK(vnode_associate_extattr, mp, mp->mnt_label, vp,
               vp->v_label);
   
           return (error);
   }
   
   void
   mac_vnode_associate_singlelabel(struct mount *mp, struct vnode *vp)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(vnode_associate_singlelabel, mp,
               mp->mnt_label, vp, vp->v_label);
   }
   
   /*
    * Functions implementing extended-attribute backed labels for file systems
    * that support it.
    *
    * Where possible, we use EA transactions to make writes to multiple
    * attributes across difference policies mutually atomic.  We allow work to
    * continue on file systems not supporting EA transactions, but generate a
    * printf warning.
    */
   int
   mac_vnode_create_extattr(struct ucred *cred, struct mount *mp,
       struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(dvp, "mac_vnode_create_extattr");
           ASSERT_VOP_LOCKED(vp, "mac_vnode_create_extattr");
   
           error = VOP_OPENEXTATTR(vp, cred, curthread);
           if (error == EOPNOTSUPP) {
                   if (ea_warn_once == 0) {
                           printf("Warning: transactions not supported "
                               "in EA write.\n");
                           ea_warn_once = 1;
                   }
           } else if (error)
                   return (error);
   
           MAC_POLICY_CHECK(vnode_create_extattr, cred, mp, mp->mnt_label, dvp,
               dvp->v_label, vp, vp->v_label, cnp);
   
           if (error) {
                   VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread);
                   return (error);
           }
   
           error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread);
           if (error == EOPNOTSUPP)
                   error = 0;
   
           return (error);
   }
   
   static int
   mac_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
       struct label *intlabel)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_setlabel_extattr");
   
           error = VOP_OPENEXTATTR(vp, cred, curthread);
           if (error == EOPNOTSUPP) {
                   if (ea_warn_once == 0) {
                           printf("Warning: transactions not supported "
                               "in EA write.\n");
                           ea_warn_once = 1;
                   }
           } else if (error)
                   return (error);
   
           MAC_POLICY_CHECK(vnode_setlabel_extattr, cred, vp, vp->v_label,
               intlabel);
   
           if (error) {
                   VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread);
                   return (error);
           }
   
           error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread);
           if (error == EOPNOTSUPP)
                   error = 0;
   
           return (error);
   }
   
   void
   mac_vnode_execve_transition(struct ucred *old, struct ucred *new,
       struct vnode *vp, struct label *interpvplabel, struct image_params *imgp)
   {
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_execve_transition");
   
           MAC_POLICY_PERFORM(vnode_execve_transition, old, new, vp,
               vp->v_label, interpvplabel, imgp, imgp->execlabel);
   }
   
   int
   mac_vnode_execve_will_transition(struct ucred *old, struct vnode *vp,
       struct label *interpvplabel, struct image_params *imgp)
   {
           int result;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_execve_will_transition");
   
           result = 0;
           /* No sleeping since the process lock will be held by the caller. */
           MAC_POLICY_BOOLEAN_NOSLEEP(vnode_execve_will_transition, ||, old, vp,
               vp->v_label, interpvplabel, imgp, imgp->execlabel);
   
           return (result);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_access, "struct ucred *",
       "struct vnode *", "accmode_t");
   
   int
   mac_vnode_check_access_impl(struct ucred *cred, struct vnode *vp, accmode_t accmode)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_access");
   
           MAC_POLICY_CHECK(vnode_check_access, cred, vp, vp->v_label, accmode);
           MAC_CHECK_PROBE3(vnode_check_access, error, cred, vp, accmode);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(vnode_check_chdir, "struct ucred *",
       "struct vnode *");
   
   int
   mac_vnode_check_chdir(struct ucred *cred, struct vnode *dvp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_chdir");
   
           MAC_POLICY_CHECK(vnode_check_chdir, cred, dvp, dvp->v_label);
           MAC_CHECK_PROBE2(vnode_check_chdir, error, cred, dvp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(vnode_check_chroot, "struct ucred *",
       "struct vnode *");
   
   int
   mac_vnode_check_chroot(struct ucred *cred, struct vnode *dvp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_chroot");
   
           MAC_POLICY_CHECK(vnode_check_chroot, cred, dvp, dvp->v_label);
           MAC_CHECK_PROBE2(vnode_check_chroot, error, cred, dvp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(vnode_check_create, "struct ucred *",
       "struct vnode *", "struct componentname *", "struct vattr *");
   
   int
   mac_vnode_check_create(struct ucred *cred, struct vnode *dvp,
       struct componentname *cnp, struct vattr *vap)
   {
           int error;
   
           ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_create");
   
           MAC_POLICY_CHECK(vnode_check_create, cred, dvp, dvp->v_label, cnp,
               vap);
           MAC_CHECK_PROBE4(vnode_check_create, error, cred, dvp, cnp, vap);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_deleteacl, "struct ucred *",
       "struct vnode *", "acl_type_t");
   
   int
   mac_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
       acl_type_t type)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_deleteacl");
   
           MAC_POLICY_CHECK(vnode_check_deleteacl, cred, vp, vp->v_label, type);
           MAC_CHECK_PROBE3(vnode_check_deleteacl, error, cred, vp, type);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(vnode_check_deleteextattr, "struct ucred *",
       "struct vnode *", "int", "const char *");
   
   int
   mac_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
       int attrnamespace, const char *name)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_deleteextattr");
   
           MAC_POLICY_CHECK(vnode_check_deleteextattr, cred, vp, vp->v_label,
               attrnamespace, name);
           MAC_CHECK_PROBE4(vnode_check_deleteextattr, error, cred, vp,
               attrnamespace, name);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_exec, "struct ucred *", "struct vnode *",
       "struct image_params *");
   
   int
   mac_vnode_check_exec(struct ucred *cred, struct vnode *vp,
       struct image_params *imgp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_exec");
   
           MAC_POLICY_CHECK(vnode_check_exec, cred, vp, vp->v_label, imgp,
               imgp->execlabel);
           MAC_CHECK_PROBE3(vnode_check_exec, error, cred, vp, imgp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_getacl, "struct ucred *",
       "struct vnode *", "acl_type_t");
   
   int
   mac_vnode_check_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_getacl");
   
           MAC_POLICY_CHECK(vnode_check_getacl, cred, vp, vp->v_label, type);
           MAC_CHECK_PROBE3(vnode_check_getacl, error, cred, vp, type);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(vnode_check_getextattr, "struct ucred *",
       "struct vnode *", "int", "const char *");
   
   int
   mac_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
       int attrnamespace, const char *name)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_getextattr");
   
           MAC_POLICY_CHECK(vnode_check_getextattr, cred, vp, vp->v_label,
               attrnamespace, name);
           MAC_CHECK_PROBE4(vnode_check_getextattr, error, cred, vp,
               attrnamespace, name);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(vnode_check_link, "struct ucred *", "struct vnode *",
       "struct vnode *", "struct componentname *");
   
   int
   mac_vnode_check_link(struct ucred *cred, struct vnode *dvp,
       struct vnode *vp, struct componentname *cnp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_link");
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_link");
   
           MAC_POLICY_CHECK(vnode_check_link, cred, dvp, dvp->v_label, vp,
               vp->v_label, cnp);
           MAC_CHECK_PROBE4(vnode_check_link, error, cred, dvp, vp, cnp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_listextattr, "struct ucred *",
       "struct vnode *", "int");
   
   int
   mac_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
       int attrnamespace)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_listextattr");
   
           MAC_POLICY_CHECK(vnode_check_listextattr, cred, vp, vp->v_label,
               attrnamespace);
           MAC_CHECK_PROBE3(vnode_check_listextattr, error, cred, vp,
               attrnamespace);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_lookup, "struct ucred *",
       "struct vnode *", "struct componentname *");
   
   int
   mac_vnode_check_lookup_impl(struct ucred *cred, struct vnode *dvp,
       struct componentname *cnp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_lookup");
   
           if ((cnp->cn_flags & NOMACCHECK) != 0)
                   return (0);
           MAC_POLICY_CHECK(vnode_check_lookup, cred, dvp, dvp->v_label, cnp);
           MAC_CHECK_PROBE3(vnode_check_lookup, error, cred, dvp, cnp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(vnode_check_mmap, "struct ucred *", "struct vnode *",
       "int", "int");
   
   int
   mac_vnode_check_mmap_impl(struct ucred *cred, struct vnode *vp, int prot,
       int flags)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mmap");
   
           MAC_POLICY_CHECK(vnode_check_mmap, cred, vp, vp->v_label, prot, flags);
           MAC_CHECK_PROBE4(vnode_check_mmap, error, cred, vp, prot, flags);
   
           return (error);
   }
   
   void
   mac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
       int *prot)
   {
           int result = *prot;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mmap_downgrade");
   
           MAC_POLICY_PERFORM(vnode_check_mmap_downgrade, cred, vp, vp->v_label,
               &result);
   
           *prot = result;
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_mprotect, "struct ucred *",
       "struct vnode *", "int");
   
   int
   mac_vnode_check_mprotect(struct ucred *cred, struct vnode *vp, int prot)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_mprotect");
   
           MAC_POLICY_CHECK(vnode_check_mprotect, cred, vp, vp->v_label, prot);
           MAC_CHECK_PROBE3(vnode_check_mprotect, error, cred, vp, prot);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_open, "struct ucred *", "struct vnode *",
       "accmode_t");
   
   int
   mac_vnode_check_open_impl(struct ucred *cred, struct vnode *vp, accmode_t accmode)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_open");
   
           MAC_POLICY_CHECK(vnode_check_open, cred, vp, vp->v_label, accmode);
           MAC_CHECK_PROBE3(vnode_check_open, error, cred, vp, accmode);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_poll, "struct ucred *", "struct ucred *",
       "struct vnode *");
   
   int
   mac_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred,
       struct vnode *vp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_poll");
   
           MAC_POLICY_CHECK(vnode_check_poll, active_cred, file_cred, vp,
               vp->v_label);
           MAC_CHECK_PROBE3(vnode_check_poll, error, active_cred, file_cred,
               vp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_read, "struct ucred *", "struct ucred *",
       "struct vnode *");
   
   int
   mac_vnode_check_read_impl(struct ucred *active_cred, struct ucred *file_cred,
       struct vnode *vp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_read");
   
           MAC_POLICY_CHECK(vnode_check_read, active_cred, file_cred, vp,
               vp->v_label);
           MAC_CHECK_PROBE3(vnode_check_read, error, active_cred, file_cred,
               vp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(vnode_check_readdir, "struct ucred *",
       "struct vnode *");
   
   int
   mac_vnode_check_readdir(struct ucred *cred, struct vnode *dvp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_readdir");
   
           MAC_POLICY_CHECK(vnode_check_readdir, cred, dvp, dvp->v_label);
           MAC_CHECK_PROBE2(vnode_check_readdir, error, cred, dvp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(vnode_check_readlink, "struct ucred *",
       "struct vnode *");
   
   int
   mac_vnode_check_readlink_impl(struct ucred *cred, struct vnode *vp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_readlink");
   
           MAC_POLICY_CHECK(vnode_check_readlink, cred, vp, vp->v_label);
           MAC_CHECK_PROBE2(vnode_check_readlink, error, cred, vp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_relabel, "struct ucred *",
       "struct vnode *", "struct label *");
   
   static int
   mac_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
       struct label *newlabel)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_relabel");
   
           MAC_POLICY_CHECK(vnode_check_relabel, cred, vp, vp->v_label, newlabel);
           MAC_CHECK_PROBE3(vnode_check_relabel, error, cred, vp, newlabel);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(vnode_check_rename_from, "struct ucred *",
       "struct vnode *", "struct vnode *", "struct componentname *");
   
   int
   mac_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
       struct vnode *vp, struct componentname *cnp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_rename_from");
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_rename_from");
   
           MAC_POLICY_CHECK(vnode_check_rename_from, cred, dvp, dvp->v_label, vp,
               vp->v_label, cnp);
           MAC_CHECK_PROBE4(vnode_check_rename_from, error, cred, dvp, vp, cnp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(vnode_check_rename_to, "struct ucred *",
       "struct vnode *", "struct vnode *", "struct componentname *");
   
   int
   mac_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
       struct vnode *vp, int samedir, struct componentname *cnp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_rename_to");
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_rename_to");
   
           MAC_POLICY_CHECK(vnode_check_rename_to, cred, dvp, dvp->v_label, vp,
               vp != NULL ? vp->v_label : NULL, samedir, cnp);
           MAC_CHECK_PROBE4(vnode_check_rename_to, error, cred, dvp, vp, cnp);
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE2(vnode_check_revoke, "struct ucred *",
       "struct vnode *");
   
   int
   mac_vnode_check_revoke(struct ucred *cred, struct vnode *vp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_revoke");
   
           MAC_POLICY_CHECK(vnode_check_revoke, cred, vp, vp->v_label);
           MAC_CHECK_PROBE2(vnode_check_revoke, error, cred, vp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(vnode_check_setacl, "struct ucred *",
       "struct vnode *", "acl_type_t", "struct acl *");
   
   int
   mac_vnode_check_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type,
       struct acl *acl)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setacl");
   
           MAC_POLICY_CHECK(vnode_check_setacl, cred, vp, vp->v_label, type, acl);
           MAC_CHECK_PROBE4(vnode_check_setacl, error, cred, vp, type, acl);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(vnode_check_setextattr, "struct ucred *",
       "struct vnode *", "int", "const char *");
   
   int
   mac_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
       int attrnamespace, const char *name)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setextattr");
   
           MAC_POLICY_CHECK(vnode_check_setextattr, cred, vp, vp->v_label,
               attrnamespace, name);
           MAC_CHECK_PROBE4(vnode_check_setextattr, error, cred, vp,
               attrnamespace, name);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_setflags, "struct ucred *",
       "struct vnode *", "u_long");
   
   int
   mac_vnode_check_setflags(struct ucred *cred, struct vnode *vp, u_long flags)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setflags");
   
           MAC_POLICY_CHECK(vnode_check_setflags, cred, vp, vp->v_label, flags);
           MAC_CHECK_PROBE3(vnode_check_setflags, error, cred, vp, flags);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_setmode, "struct ucred *",
       "struct vnode *", "mode_t");
   
   int
   mac_vnode_check_setmode(struct ucred *cred, struct vnode *vp, mode_t mode)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setmode");
   
           MAC_POLICY_CHECK(vnode_check_setmode, cred, vp, vp->v_label, mode);
           MAC_CHECK_PROBE3(vnode_check_setmode, error, cred, vp, mode);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(vnode_check_setowner, "struct ucred *",
       "struct vnode *", "uid_t", "gid_t");
   
   int
   mac_vnode_check_setowner(struct ucred *cred, struct vnode *vp, uid_t uid,
       gid_t gid)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setowner");
   
           MAC_POLICY_CHECK(vnode_check_setowner, cred, vp, vp->v_label, uid, gid);
           MAC_CHECK_PROBE4(vnode_check_setowner, error, cred, vp, uid, gid);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(vnode_check_setutimes, "struct ucred *",
       "struct vnode *", "struct timespec *", "struct timespec *");
   
   int
   mac_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
       struct timespec atime, struct timespec mtime)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_setutimes");
   
           MAC_POLICY_CHECK(vnode_check_setutimes, cred, vp, vp->v_label, atime,
               mtime);
           MAC_CHECK_PROBE4(vnode_check_setutimes, error, cred, vp, &atime,
               &mtime);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_stat, "struct ucred *", "struct ucred *",
       "struct vnode *");
   
   int
   mac_vnode_check_stat_impl(struct ucred *active_cred, struct ucred *file_cred,
       struct vnode *vp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_stat");
   
           MAC_POLICY_CHECK(vnode_check_stat, active_cred, file_cred, vp,
               vp->v_label);
           MAC_CHECK_PROBE3(vnode_check_stat, error, active_cred, file_cred,
               vp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE4(vnode_check_unlink, "struct ucred *",
       "struct vnode *", "struct vnode *", "struct componentname *");
   
   int
   mac_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
       struct vnode *vp, struct componentname *cnp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(dvp, "mac_vnode_check_unlink");
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_unlink");
   
           MAC_POLICY_CHECK(vnode_check_unlink, cred, dvp, dvp->v_label, vp,
               vp->v_label, cnp);
           MAC_CHECK_PROBE4(vnode_check_unlink, error, cred, dvp, vp, cnp);
   
           return (error);
   }
   
   MAC_CHECK_PROBE_DEFINE3(vnode_check_write, "struct ucred *",
       "struct ucred *", "struct vnode *");
   
   int
   mac_vnode_check_write_impl(struct ucred *active_cred, struct ucred *file_cred,
       struct vnode *vp)
   {
           int error;
   
           ASSERT_VOP_LOCKED(vp, "mac_vnode_check_write");
   
           MAC_POLICY_CHECK(vnode_check_write, active_cred, file_cred, vp,
               vp->v_label);
           MAC_CHECK_PROBE3(vnode_check_write, error, active_cred, file_cred,
               vp);
   
           return (error);
   }
   
   void
   mac_vnode_relabel(struct ucred *cred, struct vnode *vp,
       struct label *newlabel)
   {
   
           MAC_POLICY_PERFORM(vnode_relabel, cred, vp, vp->v_label, newlabel);
   }
   
   void
   mac_mount_create(struct ucred *cred, struct mount *mp)
   {
   
           MAC_POLICY_PERFORM(mount_create, cred, mp, mp->mnt_label);
   }
   
   MAC_CHECK_PROBE_DEFINE2(mount_check_stat, "struct ucred *",
       "struct mount *");
   
   int
   mac_mount_check_stat(struct ucred *cred, struct mount *mount)
   {
           int error;
   
           MAC_POLICY_CHECK_NOSLEEP(mount_check_stat, cred, mount, mount->mnt_label);
           MAC_CHECK_PROBE2(mount_check_stat, error, cred, mount);
   
           return (error);
   }
   
   void
   mac_devfs_create_device(struct ucred *cred, struct mount *mp,
       struct cdev *dev, struct devfs_dirent *de)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(devfs_create_device, cred, mp, dev, de,
               de->de_label);
   }
   
   void
   mac_devfs_create_symlink(struct ucred *cred, struct mount *mp,
       struct devfs_dirent *dd, struct devfs_dirent *de)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(devfs_create_symlink, cred, mp, dd,
               dd->de_label, de, de->de_label);
   }
   
   void
   mac_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
       struct devfs_dirent *de)
   {
   
           MAC_POLICY_PERFORM_NOSLEEP(devfs_create_directory, mp, dirname,
              dirnamelen, de, de->de_label);
  }
  
  /*
   * Implementation of VOP_SETLABEL() that relies on extended attributes to
   * store label data.  Can be referenced by filesystems supporting extended
   * attributes.
   */
  int
  vop_stdsetlabel_ea(struct vop_setlabel_args *ap)
  {
          struct vnode *vp = ap->a_vp;
          struct label *intlabel = ap->a_label;
          int error;
  
          ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea");
  
          if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
                  return (EOPNOTSUPP);
  
          error = mac_vnode_setlabel_extattr(ap->a_cred, vp, intlabel);
          if (error)
                  return (error);
  
          /*
           * XXXRW: See the comment below in vn_setlabel() as to why this might
           * be the wrong place to call mac_vnode_relabel().
           */
          mac_vnode_relabel(ap->a_cred, vp, intlabel);
  
          return (0);
  }
  
  int
  vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred)
  {
          int error;
  
          if (vp->v_mount == NULL) {
                  /* printf("vn_setlabel: null v_mount\n"); */
                  if (vp->v_type != VNON)
                          printf("vn_setlabel: null v_mount with non-VNON\n");
                  return (EBADF);
          }
  
          if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0)
                  return (EOPNOTSUPP);
  
          /*
           * Multi-phase commit.  First check the policies to confirm the
           * change is OK.  Then commit via the filesystem.  Finally, update
           * the actual vnode label.
           */
          error = mac_vnode_check_relabel(cred, vp, intlabel);
          if (error)
                  return (error);
  
          /*
           * VADMIN provides the opportunity for the filesystem to make
           * decisions about who is and is not able to modify labels and
           * protections on files.  This might not be right.  We can't assume
           * VOP_SETLABEL() will do it, because we might implement that as part
           * of vop_stdsetlabel_ea().
           */
          error = VOP_ACCESS(vp, VADMIN, cred, curthread);
          if (error)
                  return (error);
  
          error = VOP_SETLABEL(vp, intlabel, cred, curthread);
          if (error)
                  return (error);
  
          /*
           * It would be more symmetric if mac_vnode_relabel() was called here
           * rather than in VOP_SETLABEL(), but we don't for historical reasons.
           * We should think about moving it so that the filesystem is
           * responsible only for persistence in VOP_SETLABEL(), not the vnode
           * label update itself.
           */
  
          return (0);
  }
  
  #ifdef DEBUG_VFS_LOCKS
  void
  mac_vnode_assert_locked(struct vnode *vp, const char *func)
  {
  
          ASSERT_VOP_LOCKED(vp, func);
  }
  #endif

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