more mmap random on 64-bit platforms. noticed in freebsd aslr patches.

diff --git a/sys/uvm/uvm_map.c b/sys/uvm/uvm_map.c
index 702b3bf..86fb84d 100644 (file)
--- a/sys/uvm/uvm_map.c
+++ b/sys/uvm/uvm_map.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: uvm_map.c,v 1.171 2014/07/12 18:44:01 tedu Exp $      */
+/*     $OpenBSD: uvm_map.c,v 1.172 2014/07/13 08:15:16 tedu Exp $      */
 /*     $NetBSD: uvm_map.c,v 1.86 2000/11/27 08:40:03 chs Exp $ */
 
 /*
@@ -3541,7 +3541,11 @@ uvm_map_hint(struct vmspace *vm, vm_prot_t prot)
        }
 #endif
 
+#ifdef __LP64__
+       spacing = (MIN((4UL * 1024 * 1024 * 1024), BRKSIZ) - 1);
+#else
        spacing = (MIN((256 * 1024 * 1024), BRKSIZ) - 1);
+#endif
 
        addr = (vaddr_t)vm->vm_daddr;
        /*