Drop inheritable caps and caps bounding set before executing payload
This change basically does the following things:
* Add rust_bindgen for the libcap.
* Add libcap_rust wrapping the bindgen and providing
drop_inhertiable_caps and drop_bounding_set APIs;
* Call the libcap_rust APIs before execve'ing into the payload binary.
This is done using the CommandExt::pre_exec function.
Additionally this change adds basic tests for libcap_rust library and
the e2e test to verify that binary running payload have zero
capabilities.
Bug: 243633980
Test: atest libcap_rust.test
Test: atest MicrodroidTestApp
Test: adb shell /apex/com.android.virt/bin/vm run-microdroid
Test: enter microdroid shell & check microdroid_launcher has empty caps
Change-Id: Ibfb45ec912df0ad0a1db62b24c22fbe5a61ff5f3
diff --git a/libs/capabilities/bindgen/libcap.h b/libs/capabilities/bindgen/libcap.h
new file mode 100644
index 0000000..cbb90dc
--- /dev/null
+++ b/libs/capabilities/bindgen/libcap.h
@@ -0,0 +1,3 @@
+#pragma once
+
+#include <sys/capability.h>