[MTE] support force_on for device_control override

driveby: remove period for force_off message.

Test: make RunSettingsRoboTests ROBOTEST_FILTER=MemtagHelperTest
Bug: 245624194
Change-Id: I1c56af377925fd58c90bb346d9d003249c5e547c

res/values/strings.xml

@@ -8037,7 +8037,9 @@
     <!-- [CHAR LIMIT=37] Status label indicating that system needs to be rebooted for Advanced memory protection to be off. -->
     <string name="memtag_off_pending" translatable="false">Off after restart</string>
     <!-- [CHAR LIMIT=37] Status label indicating that Advanced memory protection was forced off via remote device configuration. -->
-    <string name="memtag_force_off" translatable="false">Currently unavailable for your device.</string>
+    <string name="memtag_force_off" translatable="false">Currently unavailable for your device</string>
+    <!-- [CHAR LIMIT=37] Status label indicating that Advanced memory protection was forced on via remote device configuration. -->
+    <string name="memtag_force_on" translatable="false">Always on for your device</string>
     <!-- [CHAR LIMIT=NONE] Subtext on page to control Advanced memory protection settings. -->
     <string name="memtag_footer" translatable="false">You\u0027ll have to restart your device to turn Advanced memory protection on or off. When it\u0027s on, you may notice slower device performance.</string>
     <!-- [CHAR LIMIT=31] Header of dialog asking user to reboot device. -->

src/com/android/settings/security/MemtagHelper.java

@@ -32,6 +32,13 @@ public class MemtagHelper {
                                 "persist.device_config.memory_safety_native.bootloader_override"));
     }
 
+    private static boolean isForcedOn() {
+        return "force_on"
+                .equals(
+                        SystemProperties.get(
+                                "persist.device_config.memory_safety_native.bootloader_override"));
+    }
+
     public static boolean isChecked() {
         String modes[] = SystemProperties.get("arm64.memtag.bootctl", "").split(",");
         return Arrays.asList(modes).contains("memtag");
@@ -43,7 +50,7 @@ public class MemtagHelper {
     }
 
     public static int getAvailabilityStatus() {
-        if (MemtagHelper.isForcedOff()) {
+        if (MemtagHelper.isForcedOff() || MemtagHelper.isForcedOn()) {
             return BasePreferenceController.DISABLED_DEPENDENT_SETTING;
         }
         return SystemProperties.getBoolean("ro.arm64.memtag.bootctl_settings_toggle", false)
@@ -65,6 +72,9 @@ public class MemtagHelper {
         if (isForcedOff()) {
             return R.string.memtag_force_off;
         }
+        if (isForcedOn()) {
+            return R.string.memtag_force_on;
+        }
         if (isOn()) {
             if (isChecked()) {
                 return R.string.memtag_on;

tests/robotests/src/com/android/settings/security/MemtagHelperTest.java

@@ -86,6 +86,14 @@ public class MemtagHelperTest {
                 .isEqualTo(BasePreferenceController.DISABLED_DEPENDENT_SETTING);
     }
 
+    @Test
+    public void getAvailabilityStatus_isForcedOn_isDISABLED_DEPENDENT_SETTING() {
+        ShadowSystemProperties.override(mDeviceConfigOverride, "force_on");
+        ShadowSystemProperties.override(mMemtagSupportedProperty, "true");
+        assertThat(MemtagHelper.getAvailabilityStatus())
+                .isEqualTo(BasePreferenceController.DISABLED_DEPENDENT_SETTING);
+    }
+
     @Test
     public void getAvailabilityStatus_isUnsupported_isUNSUPPORTED_ON_DEVICE() {
         ShadowSystemProperties.override(mDeviceConfigOverride, "");
@@ -159,4 +167,13 @@ public class MemtagHelperTest {
         ShadowSystemProperties.override(mMemtagProperty, "memtag");
         assertThat(MemtagHelper.getSummary()).isEqualTo(R.string.memtag_force_off);
     }
+
+    @Test
+    @Config(shadows = {ZygoteShadow.class})
+    public void getSummary_forceOffOverride_memtag_force_on() {
+        ZygoteShadow.setSupportsMemoryTagging(false);
+        ShadowSystemProperties.override(mDeviceConfigOverride, "force_on");
+        ShadowSystemProperties.override(mMemtagProperty, "memtag");
+        assertThat(MemtagHelper.getSummary()).isEqualTo(R.string.memtag_force_on);
+    }
 }