Author: andrew
Date: Thu Nov 21 13:22:23 2019
New Revision: 354947
URL: https://svnweb.freebsd.org/changeset/base/354947
Log:
Add kcsan_md_unsupported from NetBSD.
It's used to ignore virtual addresses that may have a different physical
address depending on the CPU.
Sponsored by: DARPA, AFRL
Modified:
head/sys/amd64/include/csan.h
head/sys/arm64/include/csan.h
head/sys/kern/subr_csan.c
Modified: head/sys/amd64/include/csan.h
==============================================================================
--- head/sys/amd64/include/csan.h Thu Nov 21 13:12:58 2019
(r354946)
+++ head/sys/amd64/include/csan.h Thu Nov 21 13:22:23 2019
(r354947)
@@ -36,6 +36,12 @@
#include <machine/vmparam.h>
static inline bool
+kcsan_md_unsupported(vm_offset_t addr)
+{
+ return false;
+}
+
+static inline bool
kcsan_md_is_avail(void)
{
return true;
Modified: head/sys/arm64/include/csan.h
==============================================================================
--- head/sys/arm64/include/csan.h Thu Nov 21 13:12:58 2019
(r354946)
+++ head/sys/arm64/include/csan.h Thu Nov 21 13:22:23 2019
(r354947)
@@ -36,6 +36,12 @@
#include <machine/vmparam.h>
static inline bool
+kcsan_md_unsupported(vm_offset_t addr)
+{
+ return false;
+}
+
+static inline bool
kcsan_md_is_avail(void)
{
return true;
Modified: head/sys/kern/subr_csan.c
==============================================================================
--- head/sys/kern/subr_csan.c Thu Nov 21 13:12:58 2019 (r354946)
+++ head/sys/kern/subr_csan.c Thu Nov 21 13:22:23 2019 (r354947)
@@ -151,6 +151,8 @@ kcsan_access(uintptr_t addr, size_t size, bool write,
if (__predict_false(!kcsan_enabled))
return;
+ if (__predict_false(kcsan_md_unsupported((vm_offset_t)addr)))
+ return;
new.addr = addr;
new.size = size;
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