Use the same IOPL check as in syscons.

Reviewed by:	pst, joerg

sys/amd64/amd64/mem.c

@@ -38,7 +38,7 @@
  *
  *	from: Utah $Hdr: mem.c 1.13 89/10/08$
  *	from: @(#)mem.c	7.2 (Berkeley) 5/9/91
- *	$Id$
+ *	$Id: mem.c,v 1.41 1997/02/22 09:32:33 peter Exp $
  */
 
 /*
@@ -169,6 +169,7 @@ mmopen(dev, flags, fmt, p)
 	int fmt;
 	struct proc *p;
 {
+	int error;
 	struct trapframe *fp;
 
 	switch (minor(dev)) {
@@ -179,6 +180,11 @@ mmopen(dev, flags, fmt, p)
 		return ENODEV;
 #endif
 	case 14:
+		error = suser(p->p_ucred, &p->p_acflag);
+		if (error != 0)
+			return (error);
+		if (securelevel > 0)
+			return (EPERM);
 		fp = (struct trapframe *)curproc->p_md.md_regs;
 		fp->tf_eflags |= PSL_IOPL;
 		break;

sys/i386/i386/mem.c

@@ -38,7 +38,7 @@
  *
  *	from: Utah $Hdr: mem.c 1.13 89/10/08$
  *	from: @(#)mem.c	7.2 (Berkeley) 5/9/91
- *	$Id$
+ *	$Id: mem.c,v 1.41 1997/02/22 09:32:33 peter Exp $
  */
 
 /*
@@ -169,6 +169,7 @@ mmopen(dev, flags, fmt, p)
 	int fmt;
 	struct proc *p;
 {
+	int error;
 	struct trapframe *fp;
 
 	switch (minor(dev)) {
@@ -179,6 +180,11 @@ mmopen(dev, flags, fmt, p)
 		return ENODEV;
 #endif
 	case 14:
+		error = suser(p->p_ucred, &p->p_acflag);
+		if (error != 0)
+			return (error);
+		if (securelevel > 0)
+			return (EPERM);
 		fp = (struct trapframe *)curproc->p_md.md_regs;
 		fp->tf_eflags |= PSL_IOPL;
 		break;

sys/i386/isa/pcvt/pcvt_drv.c

@@ -1383,7 +1383,7 @@ vgapelinit(void)
 #if defined XSERVER && !PCVT_USL_VT_COMPAT
 /*----------------------------------------------------------------------*
  *	initialize for X mode
- *	i.e.: grant current process (the X server) all IO priviledges,
+ *	i.e.: grant current process (the X server) all IO privileges,
  *	and mark in static variable so other hooks can test for it,
  *	save all loaded fonts and screen pages to pageable buffers;
  *	if parameter `on' is false, the same procedure is done reverse.
@@ -1403,7 +1403,7 @@ pcvt_xmode_set(int on, struct proc *p)
 	struct syscframe *fp;
 #endif /* PCVT_NETBSD > 9 */
 
-	int i;
+	int error, i;
 
 	/* X will only run on VGA and Hercules adaptors */
 
@@ -1419,12 +1419,15 @@ pcvt_xmode_set(int on, struct proc *p)
 	if(on)
 	{
 		/*
-		 * Test whether the calling process has super-user priviledges.
+		 * Test whether the calling process has super-user privileges
+		 * and we're in insecure mode.
 		 * This prevents us from granting the potential security hole
-		 * `IO priv' to any process (effective uid is checked).
+		 * `IO priv' to insufficiently privileged processes.
 		 */
-
-		if(suser(p->p_ucred, &p->p_acflag) != 0)
+		error = suser(p->p_ucred, &p->p_acflag);
+		if (error != 0)
+			return (error);
+		if (securelevel > 0)
 			return (EPERM);
 
 		if(pcvt_xmode)

sys/i386/isa/pcvt/pcvt_ext.c

@@ -2681,6 +2681,7 @@ usl_vt_ioctl(Dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
 
 	case KDENABIO:
 		/* grant the process IO access; only allowed if euid == 0 */
+		/* and insecure */
 	{
 
 #if PCVT_NETBSD > 9 || PCVT_FREEBSD >= 200
@@ -2691,7 +2692,10 @@ usl_vt_ioctl(Dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
 		struct syscframe *fp = (struct syscframe *)p->p_regs;
 #endif
 
-		if(suser(p->p_ucred, &p->p_acflag) != 0)
+		error = suser(p->p_ucred, &p->p_acflag);
+		if (error != 0)
+			return (error);
+		if (securelevel > 0)
 			return (EPERM);
 
 #if PCVT_NETBSD || (PCVT_FREEBSD && PCVT_FREEBSD > 102)

sys/i386/isa/spigot.c

@@ -149,6 +149,7 @@ spigot_attach(struct isa_device *devp)
 static	int
 spigot_open(dev_t dev, int flags, int fmt, struct proc *p)
 {
+int			error;
 struct	spigot_softc	*ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
 
 	if((ss->flags & ALIVE) == 0)
@@ -158,8 +159,16 @@ struct	spigot_softc	*ss = (struct spigot_softc *)&spigot_softc[UNIT(dev)];
 		return EBUSY;
 
 #if !defined(SPIGOT_UNSECURE)
-	/* Since we can't map the i/o page, don't allow open unless suser */
-	if(suser(p->p_ucred, &p->p_acflag) != 0)
+	/*
+	 * Don't allow open() unless the process has sufficient privileges,
+	 * since mapping the i/o page and granting i/o privilege would
+	 * require sufficient privilege soon and nothing much can be done
+	 * without them.
+	 */
+	error = suser(p->p_ucred, &p->p_acflag);
+	if (error != 0)
+		return error;
+	if (securelevel > 0)
 		return EPERM;
 #endif
 
@@ -216,6 +225,8 @@ struct	spigot_info	*info;
 		error = suser(p->p_ucred, &p->p_acflag);
 		if (error != 0)
 			return error;
+		if (securelevel > 0)
+			return EPERM;
 #endif
 		fp=(struct trapframe *)p->p_md.md_regs;
 		fp->tf_eflags |= PSL_IOPL;