Change VM_MIN_ADDRESS to PAGE_SIZE to forbid mapping anything at virtual

address zero, as done on all other platforms.
ok deraadt@ kettenis@

diff --git a/sys/arch/riscv64/include/vmparam.h b/sys/arch/riscv64/include/vmparam.h
index 16858dc..c9e6388 100644 (file)
--- a/sys/arch/riscv64/include/vmparam.h
+++ b/sys/arch/riscv64/include/vmparam.h
@@ -1,4 +1,4 @@
-/*     $OpenBSD: vmparam.h,v 1.5 2021/07/02 10:42:22 kettenis Exp $    */
+/*     $OpenBSD: vmparam.h,v 1.6 2022/03/22 06:47:38 miod Exp $        */
 
 /*-
  * Copyright (c) 1990 The Regents of the University of California.
@@ -111,8 +111,7 @@
  * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
  * user address space.
  */
-// XXX OpenBSD/arm64 starts VM_MIN_ADDRESS from PAGE_SIZE. Why?
-#define        VM_MIN_ADDRESS          (0x0000000000000000UL)
+#define        VM_MIN_ADDRESS          ((vaddr_t)PAGE_SIZE)
 #define        VM_MAX_ADDRESS          (0xffffffffffffffffUL)
 
 #define        VM_MIN_KERNEL_ADDRESS   (0xffffffc000000000UL)