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kernel: limit syscallfmt user strings to 64K (as in validname)

--- a/sys/src/9/port/syscallfmt.c

+++ b/sys/src/9/port/syscallfmt.c

@@ -36,8 +36,8 @@

 static void

 fmtuserstring(Fmt* f, char* a, char* suffix)

 {

+	char *t, *e;

 	int n;

-	char *t;

 	if(a == nil){

 		fmtprint(f, "0/\"\"%s", suffix);

@@ -44,7 +44,10 @@

 		return;

 	}

 	validaddr((uintptr)a, 1, 0);

-	n = ((char*)vmemchr(a, 0, ~0) - a) + 1;

+	n = 1<<16;

+	e = vmemchr(a, 0, n);

+	if(e != nil)

+		n = e - a;

 	t = smalloc(n+1);

 	memmove(t, a, n);

 	t[n] = 0;