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

and is therefore unprivileged. Used to set grant tables.

lib/syslib/Makefile.in

@@ -49,6 +49,7 @@ libsys_FILES=" \
 	sys_sigreturn.c \
 	sys_sigsend.c \
 	sys_privctl.c \
+	sys_paramctl.c \
 	sys_times.c \
 	sys_trace.c \
 	sys_umap.c \

lib/syslib/safecopies.c

@@ -12,6 +12,8 @@
 #include <stdlib.h>
 #include <minix/syslib.h>
 #include <minix/safecopies.h>
+#include <minix/com.h>
+#include <string.h>
 
 PRIVATE cp_grant_t *grants = NULL;
 PRIVATE int ngrants = 0, dynamic = 1;
@@ -33,8 +35,7 @@ cpf_preallocate(cp_grant_t *new_grants, int new_ngrants)
 	}
 
 	/* Update kernel about the table. */
-	if((s=sys_privctl(SELF, SYS_PRIV_SET_GRANTS,
-		new_ngrants, new_grants))) {
+	if((s=sys_paramctl(SYS_PARAM_SET_GRANT, new_ngrants, new_grants, 0))) {
 		return -1;
 	}
 
@@ -79,7 +80,7 @@ cpf_grow(void)
 		new_grants[g].cp_flags = 0;
 
 	/* Inform kernel about new size (and possibly new location). */
-	if(sys_privctl(SELF, SYS_PRIV_SET_GRANTS, new_size, new_grants)) {
+	if((sys_paramctl(SYS_PARAM_SET_GRANT, new_size, new_grants, 0))) {
 		free(new_grants);
 		return;	/* Failed - don't grow then. */
 	}