Pass active_cred and file_cred into the MAC framework explicitly

for mac_check_vnode_{poll,read,stat,write}().  Pass in fp->f_cred
when calling these checks with a struct file available.  Otherwise,
pass NOCRED.  All currently MAC policies use active_cred, but
could now offer the cached credential semantic used for the base
system security model.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs

24 files changed, 302 insertions, 196 deletions

diff --git a/sys/kern/kern_ktrace.c b/sys/kern/kern_ktrace.c
index a21f5e2..71bdd24 100644
--- a/sys/kern/kern_ktrace.c
+++ b/sys/kern/kern_ktrace.c
@@ -771,7 +771,7 @@ ktr_writerequest(struct ktr_request *req)
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
 	(void)VOP_LEASE(vp, td, cred, LEASE_WRITE);
 #ifdef MAC
-	error = mac_check_vnode_write(cred, vp);
+	error = mac_check_vnode_write(cred, NOCRED, vp);
 	if (error == 0)
 #endif
 		error = VOP_WRITE(vp, &auio, IO_UNIT | IO_APPEND, cred);
diff --git a/sys/kern/kern_mac.c b/sys/kern/kern_mac.c
index 107b2d2..17dd122 100644
--- a/sys/kern/kern_mac.c
+++ b/sys/kern/kern_mac.c
@@ -1804,7 +1804,8 @@ mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
 }
 
 int
-mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1813,17 +1814,19 @@ mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_poll, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
 
 int
-mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1832,11 +1835,12 @@ mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_read, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
@@ -2076,7 +2080,8 @@ mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 int
-mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2085,16 +2090,18 @@ mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_stat, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
+	    &vp->v_label);
 	return (error);
 }
 
 int
-mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2103,11 +2110,12 @@ mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_write, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
diff --git a/sys/kern/tty_tty.c b/sys/kern/tty_tty.c
index 86132d9..a3a7a39 100644
--- a/sys/kern/tty_tty.c
+++ b/sys/kern/tty_tty.c
@@ -104,6 +104,7 @@ cttyopen(dev, flag, mode, td)
 		return (error);
 	}
 #endif
+	/* XXX: Shouldn't this cred be td->td_ucred not NOCRED? */
 	error = VOP_OPEN(ttyvp, flag, NOCRED, td);
 	VOP_UNLOCK(ttyvp, 0, td);
 	return (error);
@@ -130,10 +131,10 @@ cttyread(dev, uio, flag)
 		return (EIO);
 	vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
 #ifdef MAC
-	/* XXX: Shouldn't the cred below be td->td_ucred not NOCRED? */
-	error = mac_check_vnode_read(td->td_ucred, ttyvp);
+	error = mac_check_vnode_read(td->td_ucred, NOCRED, ttyvp);
 	if (error == 0)
 #endif
+		/* XXX: Shouldn't this cred be td->td_ucred not NOCRED? */
 		error = VOP_READ(ttyvp, uio, flag, NOCRED);
 	VOP_UNLOCK(ttyvp, 0, td);
 	return (error);
@@ -165,10 +166,10 @@ cttywrite(dev, uio, flag)
 		return (error);
 	vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
 #ifdef MAC
-	/* XXX: shouldn't the cred below be td->td_ucred not NOCRED? */
-	error = mac_check_vnode_write(td->td_ucred, ttyvp);
+	error = mac_check_vnode_write(td->td_ucred, NOCRED, ttyvp);
 	if (error == 0)
 #endif
+		/* XXX: shouldn't this cred be td->td_ucred not NOCRED? */
 		error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
 	VOP_UNLOCK(ttyvp, 0, td);
 	vn_finished_write(mp);
@@ -236,7 +237,7 @@ cttypoll(dev, events, td)
 		return (seltrue(dev, events, td));
 #ifdef MAC
 	vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, td);
-	error = mac_check_vnode_poll(td->td_ucred, ttyvp);
+	error = mac_check_vnode_poll(td->td_ucred, NOCRED, ttyvp);
 	VOP_UNLOCK(ttyvp, 0, td);
 	if (error)
 		return (error);
diff --git a/sys/kern/vfs_extattr.c b/sys/kern/vfs_extattr.c
index fce45fe..c09fbd7 100644
--- a/sys/kern/vfs_extattr.c
+++ b/sys/kern/vfs_extattr.c
@@ -734,7 +734,7 @@ open(td, uap)
 		vat.va_size = 0;
 		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
 #ifdef MAC
-		error = mac_check_vnode_write(td->td_ucred, vp);
+		error = mac_check_vnode_write(td->td_ucred, fp->f_cred, vp);
 		if (error == 0)
 #endif
 			error = VOP_SETATTR(vp, &vat, td->td_ucred, td);
@@ -2367,7 +2367,8 @@ truncate(td, uap)
 	if (vp->v_type == VDIR)
 		error = EISDIR;
 #ifdef MAC
-	else if ((error = mac_check_vnode_write(td->td_ucred, vp))) {}
+	else if ((error = mac_check_vnode_write(td->td_ucred, NOCRED, vp))) {
+	}
 #endif
 	else if ((error = vn_writechk(vp)) == 0 &&
 	    (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
@@ -2424,7 +2425,9 @@ ftruncate(td, uap)
 	if (vp->v_type == VDIR)
 		error = EISDIR;
 #ifdef MAC
-	else if ((error = mac_check_vnode_write(td->td_ucred, vp))) {}
+	else if ((error = mac_check_vnode_write(td->td_ucred, fp->f_cred,
+	    vp))) {
+	}
 #endif
 	else if ((error = vn_writechk(vp)) == 0) {
 		VATTR_NULL(&vattr);
@@ -3342,7 +3345,11 @@ fhopen(td, uap)
 		VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);	/* XXX */
 #ifdef MAC
-		error = mac_check_vnode_write(td->td_ucred, vp);
+		/*
+		 * We don't yet have fp->f_cred, so use td->td_ucred, which
+		 * should be right.
+		 */
+		error = mac_check_vnode_write(td->td_ucred, td->td_ucred, vp);
 		if (error == 0) {
 #endif
 			VATTR_NULL(vap);
diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index fce45fe..c09fbd7 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -734,7 +734,7 @@ open(td, uap)
 		vat.va_size = 0;
 		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
 #ifdef MAC
-		error = mac_check_vnode_write(td->td_ucred, vp);
+		error = mac_check_vnode_write(td->td_ucred, fp->f_cred, vp);
 		if (error == 0)
 #endif
 			error = VOP_SETATTR(vp, &vat, td->td_ucred, td);
@@ -2367,7 +2367,8 @@ truncate(td, uap)
 	if (vp->v_type == VDIR)
 		error = EISDIR;
 #ifdef MAC
-	else if ((error = mac_check_vnode_write(td->td_ucred, vp))) {}
+	else if ((error = mac_check_vnode_write(td->td_ucred, NOCRED, vp))) {
+	}
 #endif
 	else if ((error = vn_writechk(vp)) == 0 &&
 	    (error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td)) == 0) {
@@ -2424,7 +2425,9 @@ ftruncate(td, uap)
 	if (vp->v_type == VDIR)
 		error = EISDIR;
 #ifdef MAC
-	else if ((error = mac_check_vnode_write(td->td_ucred, vp))) {}
+	else if ((error = mac_check_vnode_write(td->td_ucred, fp->f_cred,
+	    vp))) {
+	}
 #endif
 	else if ((error = vn_writechk(vp)) == 0) {
 		VATTR_NULL(&vattr);
@@ -3342,7 +3345,11 @@ fhopen(td, uap)
 		VOP_LEASE(vp, td, td->td_ucred, LEASE_WRITE);
 		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);	/* XXX */
 #ifdef MAC
-		error = mac_check_vnode_write(td->td_ucred, vp);
+		/*
+		 * We don't yet have fp->f_cred, so use td->td_ucred, which
+		 * should be right.
+		 */
+		error = mac_check_vnode_write(td->td_ucred, td->td_ucred, vp);
 		if (error == 0) {
 #endif
 			VATTR_NULL(vap);
diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
index 08bdeb2..fc6c78e 100644
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -402,9 +402,11 @@ vn_rdwr(rw, vp, base, len, offset, segflg, ioflg, active_cred, file_cred,
 #ifdef MAC
 	if ((ioflg & IO_NOMACCHECK) == 0) {
 		if (rw == UIO_READ)
-			error = mac_check_vnode_read(active_cred, vp);
+			error = mac_check_vnode_read(active_cred, file_cred,
+			    vp);
 		else
-			error = mac_check_vnode_write(active_cred, vp);
+			error = mac_check_vnode_write(active_cred, file_cred,
+			    vp);
 	}
 #endif
 	if (error == 0) {
@@ -505,7 +507,7 @@ vn_read(fp, uio, active_cred, flags, td)
 	ioflag |= sequential_heuristic(uio, fp);
 
 #ifdef MAC
-	error = mac_check_vnode_read(active_cred, vp);
+	error = mac_check_vnode_read(active_cred, fp->f_cred, vp);
 	if (error == 0)
 #endif
 		error = VOP_READ(vp, uio, ioflag, fp->f_cred);
@@ -560,7 +562,7 @@ vn_write(fp, uio, active_cred, flags, td)
 		uio->uio_offset = fp->f_offset;
 	ioflag |= sequential_heuristic(uio, fp);
 #ifdef MAC
-	error = mac_check_vnode_write(active_cred, vp);
+	error = mac_check_vnode_write(active_cred, fp->f_cred, vp);
 	if (error == 0)
 #endif
 		error = VOP_WRITE(vp, uio, ioflag, fp->f_cred);
@@ -610,7 +612,7 @@ vn_stat(vp, sb, active_cred, file_cred, td)
 	u_short mode;
 
 #ifdef MAC
-	error = mac_check_vnode_stat(active_cred, vp);
+	error = mac_check_vnode_stat(active_cred, file_cred, vp);
 	if (error)
 		return (error);
 #endif
@@ -805,7 +807,7 @@ vn_poll(fp, events, active_cred, td)
 	vp = (struct vnode *)fp->f_data;
 #ifdef MAC
 	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
-	error = mac_check_vnode_poll(active_cred, vp);
+	error = mac_check_vnode_poll(active_cred, fp->f_cred, vp);
 	VOP_UNLOCK(vp, 0, td);
 	if (error)
 		return (error);
diff --git a/sys/security/mac/mac_framework.c b/sys/security/mac/mac_framework.c
index 107b2d2..17dd122 100644
--- a/sys/security/mac/mac_framework.c
+++ b/sys/security/mac/mac_framework.c
@@ -1804,7 +1804,8 @@ mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
 }
 
 int
-mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1813,17 +1814,19 @@ mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_poll, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
 
 int
-mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1832,11 +1835,12 @@ mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_read, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
@@ -2076,7 +2080,8 @@ mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 int
-mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2085,16 +2090,18 @@ mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_stat, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
+	    &vp->v_label);
 	return (error);
 }
 
 int
-mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2103,11 +2110,12 @@ mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_write, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
diff --git a/sys/security/mac/mac_framework.h b/sys/security/mac/mac_framework.h
index 0696f3c..b413220 100644
--- a/sys/security/mac/mac_framework.h
+++ b/sys/security/mac/mac_framework.h
@@ -338,8 +338,10 @@ u_char	mac_check_vnode_mmap_prot(struct ucred *cred, struct vnode *vp,
 	    int newmapping);
 int	mac_check_vnode_open(struct ucred *cred, struct vnode *vp,
 	    mode_t acc_mode);
-int	mac_check_vnode_poll(struct ucred *cred, struct vnode *vp);
-int	mac_check_vnode_read(struct ucred *cred, struct vnode *vp);
+int	mac_check_vnode_poll(struct ucred *active_cred,
+	    struct ucred *file_cred, struct vnode *vp);
+int	mac_check_vnode_read(struct ucred *active_cred,
+	    struct ucred *file_cred, struct vnode *vp);
 int	mac_check_vnode_readdir(struct ucred *cred, struct vnode *vp);
 int	mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp);
 int	mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
@@ -359,8 +361,10 @@ int	mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp,
 	    uid_t uid, gid_t gid);
 int	mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 	    struct timespec atime, struct timespec mtime);
-int	mac_check_vnode_stat(struct ucred *cred, struct vnode *vp);
-int	mac_check_vnode_write(struct ucred *cred, struct vnode *vp);
+int	mac_check_vnode_stat(struct ucred *active_cred,
+	    struct ucred *file_cred, struct vnode *vp);
+int	mac_check_vnode_write(struct ucred *active_cred,
+	    struct ucred *file_cred, struct vnode *vp);
 int	mac_getsockopt_label_get(struct ucred *cred, struct socket *so,
 	    struct mac *extmac);
 int	mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so,
diff --git a/sys/security/mac/mac_internal.h b/sys/security/mac/mac_internal.h
index 107b2d2..17dd122 100644
--- a/sys/security/mac/mac_internal.h
+++ b/sys/security/mac/mac_internal.h
@@ -1804,7 +1804,8 @@ mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
 }
 
 int
-mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1813,17 +1814,19 @@ mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_poll, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
 
 int
-mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1832,11 +1835,12 @@ mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_read, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
@@ -2076,7 +2080,8 @@ mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 int
-mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2085,16 +2090,18 @@ mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_stat, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
+	    &vp->v_label);
 	return (error);
 }
 
 int
-mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2103,11 +2110,12 @@ mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_write, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
diff --git a/sys/security/mac/mac_net.c b/sys/security/mac/mac_net.c
index 107b2d2..17dd122 100644
--- a/sys/security/mac/mac_net.c
+++ b/sys/security/mac/mac_net.c
@@ -1804,7 +1804,8 @@ mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
 }
 
 int
-mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1813,17 +1814,19 @@ mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_poll, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
 
 int
-mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1832,11 +1835,12 @@ mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_read, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
@@ -2076,7 +2080,8 @@ mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 int
-mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2085,16 +2090,18 @@ mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_stat, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
+	    &vp->v_label);
 	return (error);
 }
 
 int
-mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2103,11 +2110,12 @@ mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_write, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
diff --git a/sys/security/mac/mac_pipe.c b/sys/security/mac/mac_pipe.c
index 107b2d2..17dd122 100644
--- a/sys/security/mac/mac_pipe.c
+++ b/sys/security/mac/mac_pipe.c
@@ -1804,7 +1804,8 @@ mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
 }
 
 int
-mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1813,17 +1814,19 @@ mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_poll, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
 
 int
-mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1832,11 +1835,12 @@ mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_read, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
@@ -2076,7 +2080,8 @@ mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 int
-mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2085,16 +2090,18 @@ mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_stat, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
+	    &vp->v_label);
 	return (error);
 }
 
 int
-mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2103,11 +2110,12 @@ mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_write, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
diff --git a/sys/security/mac/mac_policy.h b/sys/security/mac/mac_policy.h
index d0065aa..c3f2046 100644
--- a/sys/security/mac/mac_policy.h
+++ b/sys/security/mac/mac_policy.h
@@ -301,9 +301,11 @@ struct mac_policy_ops {
 		    struct vnode *vp, struct label *label, int newmapping);
 	int	(*mpo_check_vnode_open)(struct ucred *cred, struct vnode *vp,
 		    struct label *label, mode_t acc_mode);
-	int	(*mpo_check_vnode_poll)(struct ucred *cred, struct vnode *vp,
+	int	(*mpo_check_vnode_poll)(struct ucred *active_cred,
+		    struct ucred *file_cred, struct vnode *vp,
 		    struct label *label);
-	int	(*mpo_check_vnode_read)(struct ucred *cred, struct vnode *vp,
+	int	(*mpo_check_vnode_read)(struct ucred *active_cred,
+		    struct ucred *file_cred, struct vnode *vp,
 		    struct label *label);
 	int	(*mpo_check_vnode_readdir)(struct ucred *cred,
 		    struct vnode *dvp, struct label *dlabel);
@@ -337,9 +339,11 @@ struct mac_policy_ops {
 	int	(*mpo_check_vnode_setutimes)(struct ucred *cred,
 		    struct vnode *vp, struct label *label,
 		    struct timespec atime, struct timespec mtime);
-	int	(*mpo_check_vnode_stat)(struct ucred *cred, struct vnode *vp,
+	int	(*mpo_check_vnode_stat)(struct ucred *active_cred,
+		    struct ucred *file_cred, struct vnode *vp,
 		    struct label *label);
-	int	(*mpo_check_vnode_write)(struct ucred *cred, struct vnode *vp,
+	int	(*mpo_check_vnode_write)(struct ucred *active_cred,
+		    struct ucred *file_cred, struct vnode *vp,
 		    struct label *label);
 };
 
diff --git a/sys/security/mac/mac_process.c b/sys/security/mac/mac_process.c
index 107b2d2..17dd122 100644
--- a/sys/security/mac/mac_process.c
+++ b/sys/security/mac/mac_process.c
@@ -1804,7 +1804,8 @@ mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
 }
 
 int
-mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1813,17 +1814,19 @@ mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_poll, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
 
 int
-mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1832,11 +1835,12 @@ mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_read, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
@@ -2076,7 +2080,8 @@ mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 int
-mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2085,16 +2090,18 @@ mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_stat, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
+	    &vp->v_label);
 	return (error);
 }
 
 int
-mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2103,11 +2110,12 @@ mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_write, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
diff --git a/sys/security/mac/mac_syscalls.c b/sys/security/mac/mac_syscalls.c
index 107b2d2..17dd122 100644
--- a/sys/security/mac/mac_syscalls.c
+++ b/sys/security/mac/mac_syscalls.c
@@ -1804,7 +1804,8 @@ mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
 }
 
 int
-mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1813,17 +1814,19 @@ mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_poll, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
 
 int
-mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1832,11 +1835,12 @@ mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_read, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
@@ -2076,7 +2080,8 @@ mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 int
-mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2085,16 +2090,18 @@ mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_stat, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
+	    &vp->v_label);
 	return (error);
 }
 
 int
-mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2103,11 +2110,12 @@ mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_write, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
diff --git a/sys/security/mac/mac_system.c b/sys/security/mac/mac_system.c
index 107b2d2..17dd122 100644
--- a/sys/security/mac/mac_system.c
+++ b/sys/security/mac/mac_system.c
@@ -1804,7 +1804,8 @@ mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
 }
 
 int
-mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1813,17 +1814,19 @@ mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_poll, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
 
 int
-mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1832,11 +1835,12 @@ mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_read, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
@@ -2076,7 +2080,8 @@ mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 int
-mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2085,16 +2090,18 @@ mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_stat, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
+	    &vp->v_label);
 	return (error);
 }
 
 int
-mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2103,11 +2110,12 @@ mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_write, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
diff --git a/sys/security/mac/mac_vfs.c b/sys/security/mac/mac_vfs.c
index 107b2d2..17dd122 100644
--- a/sys/security/mac/mac_vfs.c
+++ b/sys/security/mac/mac_vfs.c
@@ -1804,7 +1804,8 @@ mac_check_vnode_open(struct ucred *cred, struct vnode *vp, mode_t acc_mode)
 }
 
 int
-mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1813,17 +1814,19 @@ mac_check_vnode_poll(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_poll, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
 
 int
-mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -1832,11 +1835,12 @@ mac_check_vnode_read(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_read, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_read, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
@@ -2076,7 +2080,8 @@ mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 int
-mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2085,16 +2090,18 @@ mac_check_vnode_stat(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_stat, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp,
+	    &vp->v_label);
 	return (error);
 }
 
 int
-mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
+mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp)
 {
 	int error;
 
@@ -2103,11 +2110,12 @@ mac_check_vnode_write(struct ucred *cred, struct vnode *vp)
 	if (!mac_enforce_fs)
 		return (0);
 
-	error = vn_refreshlabel(vp, cred);
+	error = vn_refreshlabel(vp, active_cred);
 	if (error)
 		return (error);
 
-	MAC_CHECK(check_vnode_write, cred, vp, &vp->v_label);
+	MAC_CHECK(check_vnode_write, active_cred, file_cred, vp,
+	    &vp->v_label);
 
 	return (error);
 }
diff --git a/sys/security/mac_biba/mac_biba.c b/sys/security/mac_biba/mac_biba.c
index c830e7c..3f26d36 100644
--- a/sys/security/mac_biba/mac_biba.c
+++ b/sys/security/mac_biba/mac_biba.c
@@ -1731,15 +1731,15 @@ mac_biba_check_vnode_open(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_biba_check_vnode_poll(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_biba_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 	struct mac_biba *subj, *obj;
 
 	if (!mac_biba_enabled || !mac_biba_revocation_enabled)
 		return (0);
 
-	subj = SLOT(&cred->cr_label);
+	subj = SLOT(&active_cred->cr_label);
 	obj = SLOT(label);
 
 	if (!mac_biba_dominate_single(obj, subj))
@@ -1749,15 +1749,15 @@ mac_biba_check_vnode_poll(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_biba_check_vnode_read(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_biba_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 	struct mac_biba *subj, *obj;
 
 	if (!mac_biba_enabled || !mac_biba_revocation_enabled)
 		return (0);
 
-	subj = SLOT(&cred->cr_label);
+	subj = SLOT(&active_cred->cr_label);
 	obj = SLOT(label);
 
 	if (!mac_biba_dominate_single(obj, subj))
@@ -2016,15 +2016,15 @@ mac_biba_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_biba_check_vnode_stat(struct ucred *cred, struct vnode *vp,
-    struct label *vnodelabel)
+mac_biba_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *vnodelabel)
 {
 	struct mac_biba *subj, *obj;
 
 	if (!mac_biba_enabled)
 		return (0);
 
-	subj = SLOT(&cred->cr_label);
+	subj = SLOT(&active_cred->cr_label);
 	obj = SLOT(vnodelabel);
 
 	if (!mac_biba_dominate_single(obj, subj))
@@ -2034,15 +2034,15 @@ mac_biba_check_vnode_stat(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_biba_check_vnode_write(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_biba_check_vnode_write(struct ucred *active_cred,
+    struct ucred *file_cred, struct vnode *vp, struct label *label)
 {
 	struct mac_biba *subj, *obj;
 
 	if (!mac_biba_enabled || !mac_biba_revocation_enabled)
 		return (0);
 
-	subj = SLOT(&cred->cr_label);
+	subj = SLOT(&active_cred->cr_label);
 	obj = SLOT(label);
 
 	if (!mac_biba_dominate_single(subj, obj))
diff --git a/sys/security/mac_bsdextended/mac_bsdextended.c b/sys/security/mac_bsdextended/mac_bsdextended.c
index f0f6cee..7fae867 100644
--- a/sys/security/mac_bsdextended/mac_bsdextended.c
+++ b/sys/security/mac_bsdextended/mac_bsdextended.c
@@ -675,8 +675,8 @@ mac_bsdextended_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_bsdextended_check_vnode_stat(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_bsdextended_check_vnode_stat(struct ucred *active_cred,
+    struct ucred *file_cred, struct vnode *vp, struct label *label)
 {
 	struct vattr vap;
 	int error;
@@ -684,10 +684,11 @@ mac_bsdextended_check_vnode_stat(struct ucred *cred, struct vnode *vp,
 	if (!mac_bsdextended_enabled)
 		return (0);
 
-	error = VOP_GETATTR(vp, &vap, cred, curthread);
+	error = VOP_GETATTR(vp, &vap, active_cred, curthread);
 	if (error)
 		return (error);
-	return (mac_bsdextended_check(cred, vap.va_uid, vap.va_gid, VSTAT));
+	return (mac_bsdextended_check(active_cred, vap.va_uid, vap.va_gid,
+	    VSTAT));
 }
 
 static struct mac_policy_op_entry mac_bsdextended_ops[] =
diff --git a/sys/security/mac_mls/mac_mls.c b/sys/security/mac_mls/mac_mls.c
index a61dd60..ace75dd 100644
--- a/sys/security/mac_mls/mac_mls.c
+++ b/sys/security/mac_mls/mac_mls.c
@@ -1681,15 +1681,15 @@ mac_mls_check_vnode_open(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_mls_check_vnode_poll(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_mls_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 	struct mac_mls *subj, *obj;
 
 	if (!mac_mls_enabled || !mac_mls_revocation_enabled)
 		return (0);
 
-	subj = SLOT(&cred->cr_label);
+	subj = SLOT(&active_cred->cr_label);
 	obj = SLOT(label);
 
 	if (!mac_mls_dominate_single(subj, obj))
@@ -1699,15 +1699,15 @@ mac_mls_check_vnode_poll(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_mls_check_vnode_read(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_mls_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 	struct mac_mls *subj, *obj;
 
 	if (!mac_mls_enabled || !mac_mls_revocation_enabled)
 		return (0);
 
-	subj = SLOT(&cred->cr_label);
+	subj = SLOT(&active_cred->cr_label);
 	obj = SLOT(label);
 
 	if (!mac_mls_dominate_single(subj, obj))
@@ -1967,15 +1967,15 @@ mac_mls_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_mls_check_vnode_stat(struct ucred *cred, struct vnode *vp,
-    struct label *vnodelabel)
+mac_mls_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *vnodelabel)
 {
 	struct mac_mls *subj, *obj;
 
 	if (!mac_mls_enabled)
 		return (0);
 
-	subj = SLOT(&cred->cr_label);
+	subj = SLOT(&active_cred->cr_label);
 	obj = SLOT(vnodelabel);
 
 	if (!mac_mls_dominate_single(subj, obj))
@@ -1985,15 +1985,15 @@ mac_mls_check_vnode_stat(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_mls_check_vnode_write(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_mls_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 	struct mac_mls *subj, *obj;
 
 	if (!mac_mls_enabled || !mac_mls_revocation_enabled)
 		return (0);
 
-	subj = SLOT(&cred->cr_label);
+	subj = SLOT(&active_cred->cr_label);
 	obj = SLOT(label);
 
 	if (!mac_mls_dominate_single(obj, subj))
diff --git a/sys/security/mac_none/mac_none.c b/sys/security/mac_none/mac_none.c
index bc2da67..e473dd8 100644
--- a/sys/security/mac_none/mac_none.c
+++ b/sys/security/mac_none/mac_none.c
@@ -799,16 +799,16 @@ mac_none_check_vnode_open(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_none_check_vnode_poll(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_none_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 
 	return (0);
 }
 
 static int
-mac_none_check_vnode_read(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_none_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 
 	return (0);
@@ -913,16 +913,16 @@ mac_none_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_none_check_vnode_stat(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_none_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 
 	return (0);
 }
 
 static int
-mac_none_check_vnode_write(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_none_check_vnode_write(struct ucred *active_cred,
+    struct ucred *file_cred, struct vnode *vp, struct label *label)
 {
 
 	return (0);
diff --git a/sys/security/mac_stub/mac_stub.c b/sys/security/mac_stub/mac_stub.c
index bc2da67..e473dd8 100644
--- a/sys/security/mac_stub/mac_stub.c
+++ b/sys/security/mac_stub/mac_stub.c
@@ -799,16 +799,16 @@ mac_none_check_vnode_open(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_none_check_vnode_poll(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_none_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 
 	return (0);
 }
 
 static int
-mac_none_check_vnode_read(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_none_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 
 	return (0);
@@ -913,16 +913,16 @@ mac_none_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_none_check_vnode_stat(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_none_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 
 	return (0);
 }
 
 static int
-mac_none_check_vnode_write(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_none_check_vnode_write(struct ucred *active_cred,
+    struct ucred *file_cred, struct vnode *vp, struct label *label)
 {
 
 	return (0);
diff --git a/sys/security/mac_test/mac_test.c b/sys/security/mac_test/mac_test.c
index 76f645d..e6b5da8 100644
--- a/sys/security/mac_test/mac_test.c
+++ b/sys/security/mac_test/mac_test.c
@@ -1007,16 +1007,16 @@ mac_test_check_vnode_open(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_test_check_vnode_poll(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_test_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 
 	return (0);
 }
 
 static int
-mac_test_check_vnode_read(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_test_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 
 	return (0);
@@ -1121,16 +1121,16 @@ mac_test_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 }
 
 static int
-mac_test_check_vnode_stat(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_test_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
+    struct vnode *vp, struct label *label)
 {
 
 	return (0);
 }
 
 static int
-mac_test_check_vnode_write(struct ucred *cred, struct vnode *vp,
-    struct label *label)
+mac_test_check_vnode_write(struct ucred *active_cred,
+    struct ucred *file_cred, struct vnode *vp, struct label *label)
 {
 
 	return (0);
diff --git a/sys/sys/mac.h b/sys/sys/mac.h
index 0696f3c..b413220 100644
--- a/sys/sys/mac.h
+++ b/sys/sys/mac.h
@@ -338,8 +338,10 @@ u_char	mac_check_vnode_mmap_prot(struct ucred *cred, struct vnode *vp,
 	    int newmapping);
 int	mac_check_vnode_open(struct ucred *cred, struct vnode *vp,
 	    mode_t acc_mode);
-int	mac_check_vnode_poll(struct ucred *cred, struct vnode *vp);
-int	mac_check_vnode_read(struct ucred *cred, struct vnode *vp);
+int	mac_check_vnode_poll(struct ucred *active_cred,
+	    struct ucred *file_cred, struct vnode *vp);
+int	mac_check_vnode_read(struct ucred *active_cred,
+	    struct ucred *file_cred, struct vnode *vp);
 int	mac_check_vnode_readdir(struct ucred *cred, struct vnode *vp);
 int	mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp);
 int	mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
@@ -359,8 +361,10 @@ int	mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp,
 	    uid_t uid, gid_t gid);
 int	mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
 	    struct timespec atime, struct timespec mtime);
-int	mac_check_vnode_stat(struct ucred *cred, struct vnode *vp);
-int	mac_check_vnode_write(struct ucred *cred, struct vnode *vp);
+int	mac_check_vnode_stat(struct ucred *active_cred,
+	    struct ucred *file_cred, struct vnode *vp);
+int	mac_check_vnode_write(struct ucred *active_cred,
+	    struct ucred *file_cred, struct vnode *vp);
 int	mac_getsockopt_label_get(struct ucred *cred, struct socket *so,
 	    struct mac *extmac);
 int	mac_getsockopt_peerlabel_get(struct ucred *cred, struct socket *so,
diff --git a/sys/sys/mac_policy.h b/sys/sys/mac_policy.h
index d0065aa..c3f2046 100644
--- a/sys/sys/mac_policy.h
+++ b/sys/sys/mac_policy.h
@@ -301,9 +301,11 @@ struct mac_policy_ops {
 		    struct vnode *vp, struct label *label, int newmapping);
 	int	(*mpo_check_vnode_open)(struct ucred *cred, struct vnode *vp,
 		    struct label *label, mode_t acc_mode);
-	int	(*mpo_check_vnode_poll)(struct ucred *cred, struct vnode *vp,
+	int	(*mpo_check_vnode_poll)(struct ucred *active_cred,
+		    struct ucred *file_cred, struct vnode *vp,
 		    struct label *label);
-	int	(*mpo_check_vnode_read)(struct ucred *cred, struct vnode *vp,
+	int	(*mpo_check_vnode_read)(struct ucred *active_cred,
+		    struct ucred *file_cred, struct vnode *vp,
 		    struct label *label);
 	int	(*mpo_check_vnode_readdir)(struct ucred *cred,
 		    struct vnode *dvp, struct label *dlabel);
@@ -337,9 +339,11 @@ struct mac_policy_ops {
 	int	(*mpo_check_vnode_setutimes)(struct ucred *cred,
 		    struct vnode *vp, struct label *label,
 		    struct timespec atime, struct timespec mtime);
-	int	(*mpo_check_vnode_stat)(struct ucred *cred, struct vnode *vp,
+	int	(*mpo_check_vnode_stat)(struct ucred *active_cred,
+		    struct ucred *file_cred, struct vnode *vp,
 		    struct label *label);
-	int	(*mpo_check_vnode_write)(struct ucred *cred, struct vnode *vp,
+	int	(*mpo_check_vnode_write)(struct ucred *active_cred,
+		    struct ucred *file_cred, struct vnode *vp,
 		    struct label *label);
 };