Add a "dalvik.vm.gc.overwritefree" property. When set to "true", the
VM will be given the "-Xgc:overwritefree" flag, and the GC will
clobber the memory of freed objects.
diff --git a/core/jni/AndroidRuntime.cpp b/core/jni/AndroidRuntime.cpp
index fa1ee0d..1d22de3 100644
--- a/core/jni/AndroidRuntime.cpp
+++ b/core/jni/AndroidRuntime.cpp
@@ -656,6 +656,15 @@
}
}
+ /* enable poisoning of memory of freed objects */
+ property_get("dalvik.vm.gc.overwritefree", propBuf, "false");
+ if (strcmp(propBuf, "true") == 0) {
+ opt.optionString = "-Xgc:overwritefree";
+ mOptions.add(opt);
+ } else if (strcmp(propBuf, "false") != 0) {
+ LOGW("dalvik.vm.gc.overwritefree should be 'true' or 'false'");
+ }
+
/* enable debugging; set suspend=y to pause during VM init */
#ifdef HAVE_ANDROID_OS
/* use android ADB transport */