New kernel call, SYS_PARAMCTL, that sets parameters of the caller

and is therefore unprivileged. Used to set grant tables.

kernel/system/Makefile

@@ -35,6 +35,7 @@ OBJECTS	= \
 	$(SYSTEM)(do_vcopy.o) \
 	$(SYSTEM)(do_umap.o) \
 	$(SYSTEM)(do_memset.o) \
+	$(SYSTEM)(do_paramctl.o) \
 	$(SYSTEM)(do_privctl.o) \
 	$(SYSTEM)(do_segctl.o) \
 	$(SYSTEM)(do_safecopy.o) \
@@ -137,6 +138,9 @@ $(SYSTEM)(do_getinfo.o):	do_getinfo.c
 $(SYSTEM)(do_abort.o):	do_abort.c
 	$(CC) do_abort.c
 
+$(SYSTEM)(do_paramctl.o):	do_paramctl.c
+	$(CC) do_paramctl.c
+
 $(SYSTEM)(do_privctl.o):	do_privctl.c
 	$(CC) do_privctl.c
 

kernel/system/do_paramctl.c

@@ -0,0 +1,45 @@
+/* The kernel call implemented in this file:
+ *   m_type:	SYS_PARAMCTL
+ *
+ * The parameters for this kernel call are:
+ *      PCTL_REQ	request code (SYS_PARAM_*)
+ *      PCTL_INT[12]	integer parameters
+ *	PCTL_ADDR1	address parameter
+ */
+
+#include "../system.h"
+#include <minix/safecopies.h>
+
+/*===========================================================================*
+ *				do_paramctl				     *
+ *===========================================================================*/
+PUBLIC int do_paramctl(m_ptr)
+message *m_ptr;
+{
+	struct proc *rp;
+	int r;
+
+	/* Who wants to set a parameter? */
+	rp = proc_addr(who_p);
+
+	/* Which parameter is it? */
+	switch(m_ptr->PCTL_REQ) {
+
+		case SYS_PARAM_SET_GRANT:
+			/* Copy grant table set in priv. struct. */
+			if ((rp->p_rts_flags & NO_PRIV) || !(priv(rp))) {
+				r = EPERM;
+			} else {
+				_K_SET_GRANT_TABLE(rp, 
+					(vir_bytes) m_ptr->PCTL_ADDR1,
+					m_ptr->PCTL_INT1);
+				r = OK;
+			}
+			break;
+		default:
+			r = EINVAL;
+			break;
+	}
+
+	return r;
+}

kernel/system/do_privctl.c

@@ -163,12 +163,6 @@ message *m_ptr;			/* pointer to request message */
 	priv(rp)->s_nr_irq++;
 
 	return OK;
-  case SYS_PRIV_SET_GRANTS:
-	if ((rp->p_rts_flags & NO_PRIV) || !(priv(rp))) return(EPERM);
-	_K_SET_GRANT_TABLE(rp, 
-		(vir_bytes) m_ptr->CTL_ARG_PTR, m_ptr->CTL_MM_PRIV);
-	return OK;
-
   default:
 	kprintf("do_privctl: bad request %d\n", m_ptr->CTL_REQUEST);
 	return EINVAL;

kernel/system/do_safecopy.c

@@ -1,5 +1,5 @@
 /* The kernel call implemented in this file:
- *   m_type:	SYS_SAFECOPYFROM or SYS_SAFECOPYTO
+ *   m_type:	SYS_SAFECOPYFROM or SYS_SAFECOPYTO or SYS_VSAFECOPY
  *
  * The parameters for this kernel call are:
  *    	SCP_FROM_TO	other endpoint