Crash_Report_Mechanism_In_Tizen

This document discusses Cisco IOS shellcoding and reverse engineering. It covers topics like Cisco IOS shellcodes that are image-independent by disassembling or interrupting hijacking. It also discusses Tcl shellcodes, Cisco IOS reverse engineering challenges including lack of modularity and APIs. The document details subsystems, registries, processes, command parser tree, debugging Cisco IOS, and magic numbers used in Cisco IOS.

Performance evaluation of various implementations of off-cpu wakeup path tracers for Linux kernel, using kprobe, ftrace, and ebpf.

This document provides an overview of kernel debugging on Solaris systems using the modular debugger Mdb and dynamic tracing framework DTrace. It discusses debugging live kernels with Mdb, analyzing system crash dumps with Mdb, and using DTrace to monitor the kernel at runtime by enabling probes published by different providers. The document outlines the key tools, techniques, and challenges involved in kernel debugging and crash analysis on Solaris.

Compared to x86, ARM shellcode has made little progress. The x86 hardware is largely homogenous. ARM, however, has several versions and variants across devices today. There are several constraints and subtleties involved in writing production quality ARM shellcode which works on modern ARM hardware, not just on QEMU emulators. In this talk, we shall explore issues such as overcoming cache coherency, reliable polymorphic shellcode, ARM egghunting and last but not the least, polyglot ARM shellcode. A bonus side effect of this talk will be creating headaches for those who like to defend agaisnt attacks using age old signature based techniques.

In this unit we provide more details to the UoS educational, in particular it's implementation in VHDL. Unit duration: 50mn. License: LGPL 2.1

Linux Capabilities: A better root than SUID root Presented at LinuxCon2014, Düsseldorf, Oct. 15th 2014

The document describes how to port and modify drivers for UART, Ethernet, LCD, and keypad on a Mango100 board running Android. It provides instructions on configuring the kernel, modifying driver source code files, and checking that the drivers are functioning properly. Key steps include enabling drivers in the kernel .config file, adding device registration code, and modifying functions to set GPIO pins and timing parameters for devices like the LCD. It also explains how to view input events in logcat and trace the flow of key events through the Android framework.

The document provides guidance on server hardening techniques. It discusses using netstat to view listening services on a server and using update-rc.d or chkconfig to disable unnecessary services from starting at boot. It also recommends enabling access control lists (ACLs) in file system mounts, using SELinux or AppArmor to enforce mandatory access controls, and setting reasonable PHP memory limits to prevent potential denial of service attacks. The document stresses the importance of only allowing approved applications to execute and knowing the resource limits of the server to avoid potential outages.

Slides from my presentation on ARM Shellcode at #44CON 2018, London. In this talk, we explore ARM egghunting and "Quantum Leap" code - polyglot ARM shellcode. A bonus side effect of this talk will be creating headaches for those who like to defend agaisnt attacks using age old signature based techniques.

IF YOU ARE CONCERNED ABOUT CLOUD SECURITY PLEASE READ http://blog.hackapp.com/2014/09/what-if-i-was-cloud.html

The document discusses kernel debugging techniques. It covers analyzing kernel error logs, debugging memory errors, detecting kernel deadlocks, and troubleshooting login issues. The key debugging steps involve prerequisites like having the kernel source code, reading the error logs and call traces to understand the bug, and tracing from assembly to C code to transactions. Memory debugging tools like AddressSanitizer are also covered.

The document discusses SPARC, an open instruction set architecture developed by Sun Microsystems. It provides an overview of SPARC features such as the 32-bit and 64-bit versions, 128 general purpose registers, and floating-point unit capabilities. It also describes the register window mechanism and how it is used in a "Hello World" program example.

This document provides an overview and comparison of various tools for debugging, profiling, and tracing C/C++ programs on Linux. It discusses concepts and implementations of debugging tools like gdb and Valgrind, profiling tools like gprof and perf, and tracing tools like strace, SystemTap, and LTTng. For each tool, it provides examples of common use cases and highlights strengths and limitations. The document aims to help developers select the appropriate tool based on their specific needs such as debugging memory errors, profiling performance bottlenecks, or tracing system calls.

The document discusses honeypots, which are computer resources dedicated to being probed, attacked, or compromised. Honeypots can be used to detect internal attacks, identify scans and automated attacks, identify trends, keep attackers away from important systems, and collect signatures of attacks and malicious code. They work by emulating known vulnerabilities to collect information about attacks. Honeypots include low and high interaction varieties. Popular honeypot software includes Honeyd, which simulates virtual networks, and Nepenthes, which emulates vulnerabilities to capture binaries and commands executed by worms. Logs from honeypots can be analyzed to identify attack sources and collect malware samples.

Since the emerging of the OpenStack cloud computing platform in the Ubuntu community, increasing number of public/private cloud service providers choose to deploy it all over the world. Recently, Spectre and Meltdown have caused a panic in the world and the Spectre V2 is the only one which can attack the host system from the guest VM. It's vital to know the detailed process of the attack. Gavin Guo will give a detail explanation and an example of how to attack the host system. Besides, v1/v3/v4 are also introduced in the slide.

This document discusses eBPF (extended Berkeley Packet Filter), which allows tracing from the Linux kernel to userspace using BPF programs. It provides an overview of eBPF including extended registers, verification, maps, and probes. Examples are given of using eBPF for tracing functions like kfree_skb() and the C library function malloc. The Berkeley Compiler Collection (BCC) makes it easy to write eBPF programs in C and Python.

Brendan Gregg discusses the current state and future potential of BPF and BCC tools for observability in Linux. He outlines 18 areas where BPF support has progressed and 16 areas still needing work. Gregg also discusses challenges like dynamic tracing stability, overhead, ease of coding, and developing visualizations. He proposes finishing ports of his old DTrace tools and links to resources on BPF, BCC, and flame graphs.

UrQA is a mobile QA system that collects bug reports from Android apps to provide more detailed information than competitors like BugSense and ACRA. It displays an "event path" for each bug to show the steps to reproduce crashes, while competitors only show basic numbers. UrQA also uses a client-server architecture where the client handles native crashes and sends crash dumps to the server for analysis and storage.

PCD – Process Control Daemon is a light-weight system level process manager for Embedded-Linux based projects (consumer electronics, network devices, etc.). PCD starts, stops and monitors all the user space processes in the system, in a synchronized manner, using a textual configuration file. PCD recovers the system in case of errors and provides useful and detailed debug information.

Slides of my talk on Devel::NYTProf and optimizing perl code at YAPC::NA in June 2014. It covers use of NYTProf and outlines a multi-phase approach to optimizing your perl code. A video of the talk and questions is available at https://www.youtube.com/watch?v=T7EK6RZAnEA&list=UU7y4qaRSb5w2O8cCHOsKZDw

This document discusses Android memory management. It explains that Android does not have swap space and relies on garbage collection. It describes the different memory regions in Android including the Java heap, native heap, and ashmem. It provides tips on increasing heap size, viewing heap updates, and how Android manages memory through processes. It also covers topics like memory leaks, references, and tools for analyzing memory usage.

Reducing memory usage is well covered in the history of this conference, yet new tricks still do exist. When optimizing memory footprint for an home gateway device, the author found some unexpected places where small changes can save valuable amount of DRAM or Flash space. This talk will visit different areas including - Kernel: fragmentation threshold, page frame reclamation task and atomic memory. Application level: Memory inefficient shared libraries due to ABI compliance and dynamic loading. Toolchain: Tuning malloc allocator parameters and compiler options. System level: General kernel might be more memory efficient than MMU-less uClinux, and preventing lock up when the system is on the brink of running out of memory.

Slides for my Perl Memory Use talk at YAPC::Asia in Tokyo, September 2012. (This uploaded version includes quite a few slides from the OSCON version that I skipped at YAPC::Asia in order to have more time for a demo.)

This document discusses profiling the AllPaths-LG genome assembler to optimize its performance. It analyzed the CPU and memory usage of each program step on various systems. The profiling identified seven routines that use the most CPU time and I/O. Modules like FindErrors, AlignReads, and CommonPather were prioritized for optimization to reduce assembly time. Future work will involve more detailed profiling and exploring code optimizations for the most resource-intensive modules.