Add test to check for mmap_rnd_bits on supported archs.
Bug: 26558579
Change-Id: If71596aabe356da4157c81480670280f8a3160d7
diff --git a/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java b/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java
index 05079d7..de5a828 100644
--- a/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java
+++ b/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java
@@ -284,6 +284,40 @@
assertFileOwnedByGroup(dir, "root");
}
+
+ @MediumTest
+ public void testProcfsMmapRndBitsExistsAndSane() throws Exception {
+ String arch = System.getProperty("os.arch");
+ boolean supported = false;
+ boolean supported_64 = false;
+
+ if (arch.equals("aarch64") || arch.equals("x86_64"))
+ supported_64 = true;
+ else if (arch.startsWith("arm") || arch.endsWith("86"))
+ supported = true;
+
+ /* 64-bit OS should support running 32-bit applications */
+ if (supported_64) {
+ File f = new File("/proc/sys/vm/mmap_rnd_compat_bits");
+ assertTrue(f.exists());
+ assertFalse(f.canRead());
+ assertFalse(f.canWrite());
+ assertFalse(f.canExecute());
+ assertFileOwnedBy(f, "root");
+ assertFileOwnedByGroup(f, "root");
+ }
+
+ if (supported_64 || supported) {
+ File f = new File("/proc/sys/vm/mmap_rnd_bits");
+ assertTrue(f.exists());
+ assertFalse(f.canRead());
+ assertFalse(f.canWrite());
+ assertFalse(f.canExecute());
+ assertFileOwnedBy(f, "root");
+ assertFileOwnedByGroup(f, "root");
+ }
+ }
+
/**
* Assert that a file is owned by a specific owner. This is a noop if the
* file does not exist.
