By overwriting adjacent memory, a clever hacker can gain control of the process and possibly even the machine.įor example, since there is no bounds checking, the call to strcpy can overflow the buf buffer if the function parameter s is larger than 10 bytes. The idea is to give the program input that is larger than the length that the buf buffer expects. Here’s a simple and contrived example, which is close to the canonical example you’ll see on most websites that demonstrate the technique: #include In this article, I’m going to assume a certain familiarity with the basics of the aforementioned, so if you are completely new to any one of them, I suggest finding a tutorial to get you up to speed. I posit that taking the time to understand how and why these exploits work is an excellent educational experience, whether one codes in “low-level” language such as C/C++ or a high-level interpreted language such as Python or JavaScript.įor example, to implement a buffer overflow attack, it is necessary to have at least a basic understanding of the following (in no specific order):
#Linux stack smashing detected error software#
There have been security measures put in place both at the hardware ( NX bit) and software ( ASLR, stack canaries) layers to prevent these, but any subscriber to an OS bug mailing list will know that these exploits still happen frequently.
#Linux stack smashing detected error code#
This is also known as arbitrary code execution. This is usually accomplished by executing a stack-based buffer overflow, or overrun, whereby a contiguous area of memory is filled up and overflowed into the adjacent memory locations. Stack smashing is accomplished by exploiting a running process by injecting executable code or taking control of the instruction pointer in order to have it do something it wasn’t designed to do. #7 0x00007ffff38bee68 in eprosima::fastrtps::xmlparser::XMLProfileManager::loadDefaultXMLFile () at /home/rosbuild/ci_scripts/ws/src/eProsima/Fast-RTPS/src/cpp/xmlparser/XMLProfileManager.cpp:86 #6 0x00007ffff38be3fc in eprosima::fastrtps::xmlparser::XMLProfileManager::loadXMLFile (filename=) at /home/rosbuild/ci_scripts/ws/src/eProsima/Fast-RTPS/src/cpp/xmlparser/XMLProfileManager.cpp:105 Std::cout first, Python Exception expected string or bytes-like object: root=) at /home/rosbuild/ci_scripts/ws/src/eProsima/Fast-RTPS/src/cpp/xmlparser/XMLParser.cpp:228 Std::map > messageTypesAndTopics = gazebo::transport::getAdvertisedTopics() įor(auto it = messageTypesAndTopics.begin() it != messageTypesAndTopics.end() it++)įor(auto topicIt = it->second.begin() topicIt != it->second.end() topicIt++) Std::shared_ptr bridge = std::make_shared() Publisher = this->create_publisher("realsense_pointcloud") GazeboRealSenseBridge() : rclcpp::Node("gazebo_realsense_bridge") #include Ĭlass GazeboRealSenseBridge : public rclcpp::Node This code will only crash if the gzserver is running. If you remove the allocation of std::shared_ptr bridge it will not crash. I've created the following stub code to test. Also, while the backtrace points at the FastRTPS XML loading code, if I spin the ROS node and then start the gz server, it will crash after I start the server. The reason I suspect Gazebo is that the stack smash only happens when I actually start the gz server. When I try to run the client/node I get the following error (Backtrace at the end of the message) *** stack smashing detected ***: terminated I'm trying to create a simple node that listens to Gazebo transport messages and republishes them on ROS2.
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