android/build/tools/buildinfo.sh 在此文件中读取ro.build.version.security_patch
而此文件中ro.build.version.security_patch=$PLATFORM_SECURITY_PATCH所以在android/build$ 搜: grep -rn "PLATFORM_SECURITY_PATCH" ./
得到信息:是在android/build/core/version_defaults.mk中读取的信息;
PLATFORM_SECURITY_PATCH := 2015-11-01