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[src/trunk]: src/tests/modules/x86_pte_tester Add tests on the x86 PTEs. We s...
details: https://anonhg.NetBSD.org/src/rev/0cbbe5c32829
branches: trunk
changeset: 971502:0cbbe5c32829
user: maxv <maxv%NetBSD.org@localhost>
date: Sun Apr 26 09:08:40 2020 +0000
description:
Add tests on the x86 PTEs. We scan the MMU page tables directly and verify
certain properties.
diffstat:
distrib/sets/lists/debug/md.amd64 | 3 +-
distrib/sets/lists/tests/md.amd64 | 5 +-
tests/modules/Makefile | 9 +-
tests/modules/t_x86_pte.c | 132 +++++++
tests/modules/x86_pte_tester/Makefile | 14 +
tests/modules/x86_pte_tester/x86_pte_tester.c | 464 ++++++++++++++++++++++++++
6 files changed, 624 insertions(+), 3 deletions(-)
diffs (truncated from 681 to 300 lines):
diff -r d574add95f8e -r 0cbbe5c32829 distrib/sets/lists/debug/md.amd64
--- a/distrib/sets/lists/debug/md.amd64 Sun Apr 26 07:01:52 2020 +0000
+++ b/distrib/sets/lists/debug/md.amd64 Sun Apr 26 09:08:40 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: md.amd64,v 1.107 2020/04/19 13:22:58 maxv Exp $
+# $NetBSD: md.amd64,v 1.108 2020/04/26 09:08:40 maxv Exp $
./usr/lib/i386/12.202++_g.a comp-c-debuglib debuglib,compat,12.202xx
./usr/lib/i386/libi386_g.a comp-c-debuglib debuglib,compat
./usr/lib/i386/libiberty_g.a comp-obsolete obsolete
@@ -28,3 +28,4 @@
./usr/libdata/debug/usr/tests/lib/libi386/t_user_ldt.debug tests-lib-debug debug,atf
./usr/libdata/debug/usr/tests/lib/libnvmm/h_io_assist.debug tests-lib-debug debug,atf
./usr/libdata/debug/usr/tests/lib/libnvmm/h_mem_assist.debug tests-lib-debug debug,atf
+./usr/libdata/debug/usr/tests/modules/t_x86_pte.debug tests-sys-debug debug,atf
diff -r d574add95f8e -r 0cbbe5c32829 distrib/sets/lists/tests/md.amd64
--- a/distrib/sets/lists/tests/md.amd64 Sun Apr 26 07:01:52 2020 +0000
+++ b/distrib/sets/lists/tests/md.amd64 Sun Apr 26 09:08:40 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: md.amd64,v 1.8 2020/04/19 13:22:58 maxv Exp $
+# $NetBSD: md.amd64,v 1.9 2020/04/26 09:08:40 maxv Exp $
./usr/tests/kernel/arch/x86/Atffile tests-obsolete obsolete
./usr/tests/kernel/arch/x86/Kyuafile tests-obsolete obsolete
./usr/tests/kernel/arch/x86/t_ptrace_wait tests-obsolete obsolete
@@ -12,3 +12,6 @@
./usr/tests/lib/libnvmm/t_io_assist tests-lib-tests compattestfile,atf
./usr/tests/lib/libnvmm/h_mem_assist tests-lib-tests compattestfile,atf
./usr/tests/lib/libnvmm/t_mem_assist tests-lib-tests compattestfile,atf
+./usr/tests/modules/t_x86_pte tests-sys-tests atf
+./usr/tests/modules/x86_pte_tester tests-sys-tests atf
+./usr/tests/modules/x86_pte_tester/x86_pte_tester.kmod tests-sys-tests atf
diff -r d574add95f8e -r 0cbbe5c32829 tests/modules/Makefile
--- a/tests/modules/Makefile Sun Apr 26 07:01:52 2020 +0000
+++ b/tests/modules/Makefile Sun Apr 26 09:08:40 2020 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.18 2020/03/01 18:08:15 christos Exp $
+# $NetBSD: Makefile,v 1.19 2020/04/26 09:08:40 maxv Exp $
.include <bsd.own.mk>
@@ -20,6 +20,10 @@
LDADD.${i}+= -lrumpfs_kernfs ${LIBRUMPBASE}
.endfor
+.if ${MACHINE} == "amd64"
+TESTS_C+= t_x86_pte
+.endif
+
TESTS_SH= t_abi_uvm
TESTS_SH+= t_modload
TESTS_SH+= t_klua_pr_52864
@@ -31,5 +35,8 @@
SUBDIR+= k_uvm
SUBDIR+= threadpool_tester
SUBDIR+= ufetchstore
+.if ${MACHINE} == "amd64"
+SUBDIR+= x86_pte_tester
+.endif
.include <bsd.test.mk>
diff -r d574add95f8e -r 0cbbe5c32829 tests/modules/t_x86_pte.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/modules/t_x86_pte.c Sun Apr 26 09:08:40 2020 +0000
@@ -0,0 +1,132 @@
+/* $NetBSD: t_x86_pte.c,v 1.1 2020/04/26 09:08:40 maxv Exp $ */
+
+/*
+ * Copyright (c) 2020 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Maxime Villard.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__COPYRIGHT("@(#) Copyright (c) 2020\
+ The NetBSD Foundation, inc. All rights reserved.");
+__RCSID("$NetBSD: t_x86_pte.c,v 1.1 2020/04/26 09:08:40 maxv Exp $");
+
+#include <sys/types.h>
+#include <sys/module.h>
+#include <sys/sysctl.h>
+#include <err.h>
+#include <errno.h>
+#include <atf-c.h>
+
+#define mib_name "kern.x86_pte_test.test"
+#define MODULE_PATH "/usr/tests/modules/x86_pte_tester/x86_pte_tester.kmod"
+#define MODULE_NAME "x86_pte_tester"
+
+static bool module_loaded;
+
+static void
+load_module(void)
+{
+#ifndef SKIP_MODULE
+ if (module_loaded)
+ return;
+
+ modctl_load_t params = {
+ .ml_filename = MODULE_PATH,
+ .ml_flags = MODCTL_NO_PROP,
+ };
+
+ if (modctl(MODCTL_LOAD, ¶ms) != 0) {
+ warn("failed to load module '%s'", MODULE_PATH);
+ } else {
+ module_loaded = true;
+ }
+#else
+ module_loaded = true;
+#endif /* ! SKIP_MODULE */
+}
+
+static void
+unload_module(void)
+{
+#ifndef SKIP_MODULE
+ char module_name[] = MODULE_NAME;
+
+ if (modctl(MODCTL_UNLOAD, module_name) != 0) {
+ warn("failed to unload module '%s'", MODULE_NAME);
+ } else {
+ module_loaded = false;
+ }
+#endif /* ! SKIP_MODULE */
+}
+
+ATF_TC_WITH_CLEANUP(x86_pte);
+ATF_TC_HEAD(x86_pte, tc)
+{
+ atf_tc_set_md_var(tc, "descr",
+ "testing the PTEs for correctness");
+}
+ATF_TC_BODY(x86_pte, tc)
+{
+ struct {
+ size_t n_rwx;
+ bool kernel_map_with_low_ptes;
+ bool pte_is_user_accessible;
+ size_t n_user_space_is_kernel;
+ size_t n_kernel_space_is_user;
+ size_t n_svs_g_bit_set;
+ } results;
+ size_t len = sizeof(results);
+ int rv;
+
+ load_module();
+ if (!module_loaded) {
+ atf_tc_skip("loading '%s' module failed.", MODULE_NAME);
+ }
+
+ rv = sysctlbyname(mib_name, &results, &len, 0, 0);
+ ATF_REQUIRE_EQ(rv, 0);
+
+ ATF_REQUIRE_EQ(results.n_rwx, 0);
+ ATF_REQUIRE_EQ(results.kernel_map_with_low_ptes, false);
+ ATF_REQUIRE_EQ(results.pte_is_user_accessible, false);
+ ATF_REQUIRE_EQ(results.n_user_space_is_kernel, 0);
+ ATF_REQUIRE_EQ(results.n_kernel_space_is_user, 0);
+ if (results.n_svs_g_bit_set != (size_t)-1) {
+ ATF_REQUIRE_EQ(results.n_svs_g_bit_set, 0);
+ }
+}
+ATF_TC_CLEANUP(x86_pte, tc)
+{
+ unload_module();
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+ ATF_TP_ADD_TC(tp, x86_pte);
+
+ return atf_no_error();
+}
diff -r d574add95f8e -r 0cbbe5c32829 tests/modules/x86_pte_tester/Makefile
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/modules/x86_pte_tester/Makefile Sun Apr 26 09:08:40 2020 +0000
@@ -0,0 +1,14 @@
+# $NetBSD: Makefile,v 1.1 2020/04/26 09:08:41 maxv Exp $
+
+.include <bsd.own.mk>
+
+KMOD= x86_pte_tester
+KMODULEDIR= ${DESTDIR}/${TESTSBASE}/modules/${KMOD}
+
+SRCS= x86_pte_tester.c
+
+ATFFILE= no
+NOMAN= # defined
+
+.include <bsd.test.mk>
+.include <bsd.kmodule.mk>
diff -r d574add95f8e -r 0cbbe5c32829 tests/modules/x86_pte_tester/x86_pte_tester.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/modules/x86_pte_tester/x86_pte_tester.c Sun Apr 26 09:08:40 2020 +0000
@@ -0,0 +1,464 @@
+/* $NetBSD: x86_pte_tester.c,v 1.1 2020/04/26 09:08:41 maxv Exp $ */
+
+/*
+ * Copyright (c) 2016 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#define __HAVE_DIRECT_MAP
+#define __HAVE_PCPU_AREA
+#define SVS
+
+#include <sys/cdefs.h>
+#include <sys/param.h>
+#include <sys/module.h>
+#include <sys/proc.h>
+#include <sys/sysctl.h>
+#include <uvm/uvm.h>
+#include <x86/pmap.h>
+
+#if defined(__x86_64__)
+# include <amd64/pmap.h>
+# define NLEVEL 4
+#else
+# error "Unsupported configuration"
+#endif
+
+static struct {
+ struct sysctllog *ctx_sysctllog;
+ vaddr_t levels[NLEVEL];
+ struct {
+ size_t l4;
+ size_t l3;
+ size_t l2;
+ size_t l1;
+ } coord;
+ struct {
+ size_t n_rwx;
+ bool kernel_map_with_low_ptes;
+ bool pte_is_user_accessible;
+ size_t n_user_space_is_kernel;
+ size_t n_kernel_space_is_user;
+ size_t n_svs_g_bit_set;
+ } results;
+} tester_ctx;
+
+typedef enum {
+ WALK_NEXT, /* go to the next level */
+ WALK_SKIP, /* skip the next level, but keep iterating on the current one */
+ WALK_STOP /* stop the iteration on the current level */
+} walk_type;
+
+/* -------------------------------------------------------------------------- */
+
+#define is_flag(__ent, __flag) (((__ent) & __flag) != 0)
+#define is_valid(__ent) is_flag(__ent, PTE_P)
+#define get_pa(__pde) (__pde & PTE_FRAME)
+
+#define L4_MAX_NENTRIES (PAGE_SIZE / sizeof(pd_entry_t))
+#define L3_MAX_NENTRIES (PAGE_SIZE / sizeof(pd_entry_t))
+#define L2_MAX_NENTRIES (PAGE_SIZE / sizeof(pd_entry_t))
+#define L1_MAX_NENTRIES (PAGE_SIZE / sizeof(pd_entry_t))
+
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