[PATCH v8 7/7] selftest: test system mappings are sealed.

jeffxu
2025-03-03T05:09:53Z

From: Jeff Xu <jeffxu@chromium.org>

Add sysmap_is_sealed.c to test system mappings are sealed.

Note: CONFIG_MSEAL_SYSTEM_MAPPINGS must be set, as indicated in
config file.

Signed-off-by: Jeff Xu <jeffxu@chromium.org>
---
.../mseal_system_mappings/.gitignore | 2 +
.../selftests/mseal_system_mappings/Makefile | 6 +
.../selftests/mseal_system_mappings/config | 1 +
.../mseal_system_mappings/sysmap_is_sealed.c | 113 ++++++++++++++++++
4 files changed, 122 insertions(+)
create mode 100644 tools/testing/selftests/mseal_system_mappings/.gitignore
create mode 100644 tools/testing/selftests/mseal_system_mappings/Makefile
create mode 100644 tools/testing/selftests/mseal_system_mappings/config
create mode 100644 tools/testing/selftests/mseal_system_mappings/sysmap_is_sealed.c

diff --git a/tools/testing/selftests/mseal_system_mappings/.gitignore b/tools/testing/selftests/mseal_system_mappings/.gitignore
new file mode 100644
index 000000000000..319c497a595e
--- /dev/null
+++ b/tools/testing/selftests/mseal_system_mappings/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+sysmap_is_sealed
diff --git a/tools/testing/selftests/mseal_system_mappings/Makefile b/tools/testing/selftests/mseal_system_mappings/Makefile
new file mode 100644
index 000000000000..2b4504e2f52f
--- /dev/null
+++ b/tools/testing/selftests/mseal_system_mappings/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+CFLAGS += -std=c99 -pthread -Wall $(KHDR_INCLUDES)
+
+TEST_GEN_PROGS := sysmap_is_sealed
+
+include ../lib.mk
diff --git a/tools/testing/selftests/mseal_system_mappings/config b/tools/testing/selftests/mseal_system_mappings/config
new file mode 100644
index 000000000000..675cb9f37b86
--- /dev/null
+++ b/tools/testing/selftests/mseal_system_mappings/config
@@ -0,0 +1 @@
+CONFIG_MSEAL_SYSTEM_MAPPINGS=y
diff --git a/tools/testing/selftests/mseal_system_mappings/sysmap_is_sealed.c b/tools/testing/selftests/mseal_system_mappings/sysmap_is_sealed.c
new file mode 100644
index 000000000000..c1e93794a58b
--- /dev/null
+++ b/tools/testing/selftests/mseal_system_mappings/sysmap_is_sealed.c
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * test system mappings are sealed when
+ * KCONFIG_MSEAL_SYSTEM_MAPPINGS=y
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "../kselftest.h"
+#include "../kselftest_harness.h"
+
+#define VDSO_NAME "[vdso]"
+#define VVAR_NAME "[vvar]"
+#define VVAR_VCLOCK_NAME "[vvar_vclock]"
+#define UPROBES_NAME "[uprobes]"
+#define SIGPAGE_NAME "[sigpage]"
+#define VECTORS_NAME "[vectors]"
+
+#define VMFLAGS "VmFlags:"
+#define MSEAL_FLAGS "sl"
+#define MAX_LINE_LEN 512
+
+bool has_mapping(char *name, FILE *maps)
+{
+ char line[MAX_LINE_LEN];
+
+ while (fgets(line, sizeof(line), maps)) {
+ if (strstr(line, name))
+ return true;
+ }
+
+ return false;
+}
+
+bool mapping_is_sealed(char *name, FILE *maps)
+{
+ char line[MAX_LINE_LEN];
+
+ while (fgets(line, sizeof(line), maps)) {
+ if (!strncmp(line, VMFLAGS, strlen(VMFLAGS))) {
+ if (strstr(line, MSEAL_FLAGS))
+ return true;
+
+ return false;
+ }
+ }
+
+ return false;
+}
+
+FIXTURE(basic) {
+ FILE *maps;
+};
+
+FIXTURE_SETUP(basic)
+{
+ self->maps = fopen("/proc/self/smaps", "r");
+ if (!self->maps)
+ SKIP(return, "Could not open /proc/self/smap, errno=%d",
+ errno);
+};
+
+FIXTURE_TEARDOWN(basic)
+{
+ if (self->maps)
+ fclose(self->maps);
+};
+
+FIXTURE_VARIANT(basic)
+{
+ char *name;
+};
+
+FIXTURE_VARIANT_ADD(basic, vdso) {
+ .name = VDSO_NAME,
+};
+
+FIXTURE_VARIANT_ADD(basic, vvar) {
+ .name = VVAR_NAME,
+};
+
+FIXTURE_VARIANT_ADD(basic, vvar_vclock) {
+ .name = VVAR_VCLOCK_NAME,
+};
+
+FIXTURE_VARIANT_ADD(basic, sigpage) {
+ .name = SIGPAGE_NAME,
+};
+
+FIXTURE_VARIANT_ADD(basic, vectors) {
+ .name = VECTORS_NAME,
+};
+
+FIXTURE_VARIANT_ADD(basic, uprobes) {
+ .name = UPROBES_NAME,
+};
+
+TEST_F(basic, is_sealed)
+{
+ if (!has_mapping(variant->name, self->maps)) {
+ SKIP(return, "could not found the mapping, %s",
+ variant->name);
+ }
+
+ EXPECT_TRUE(mapping_is_sealed(variant->name, self->maps));
+};
+
+TEST_HARNESS_MAIN
--
2.48.1.711.g2feabab25a-goog