Module Name: src
Committed By: maxv
Date: Thu Apr 5 14:14:27 UTC 2018
Modified Files:
src/sys/arch/x86/x86: dbregs.c
Log Message:
Hum, don't let userland set bit 13, because this can crash the kernel.
To generate a diff of this commit:
cvs rdiff -u -r1.7 -r1.8 src/sys/arch/x86/x86/dbregs.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/x86/x86/dbregs.c
diff -u src/sys/arch/x86/x86/dbregs.c:1.7 src/sys/arch/x86/x86/dbregs.c:1.8
--- src/sys/arch/x86/x86/dbregs.c:1.7 Thu Apr 5 14:11:20 2018
+++ src/sys/arch/x86/x86/dbregs.c Thu Apr 5 14:14:27 2018
@@ -1,4 +1,4 @@
-/* $NetBSD: dbregs.c,v 1.7 2018/04/05 14:11:20 maxv Exp $ */
+/* $NetBSD: dbregs.c,v 1.8 2018/04/05 14:14:27 maxv Exp $ */
/*-
* Copyright (c) 2016 The NetBSD Foundation, Inc.
@@ -191,6 +191,9 @@ x86_dbregs_validate(const struct dbreg *
if (regs->dr[i] >= (vaddr_t)VM_MAXUSER_ADDRESS)
return EINVAL;
+ if (regs->dr[7] & X86_DR7_GENERAL_DETECT_ENABLE)
+ return EINVAL;
+
/*
* Skip checks for reserved registers (DR4-DR5, DR8-DR15).
*
