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Understanding Linux Kernel - Booting, Syscalls, Interrupts & Context Switching By Jayant Upadhyay 2003CS50214 Pankaj K. Sharma 2003CS50219 Sohit Bansal 2003CS50224
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Priviledge Levels: permissions set before syscalls ... Priviledge Levels: permissions set before syscalls. 0 FP. 1170s. 270 asserts. 294KLOC ...
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R2: An application-level kernel for record and replay Z. Guo, X. Wang, J. Tang, X. Liu, Z. Xu, M. Wu, M. F. Kaashoek, Z. Zhang, (MSR Asia, Tsinghua, MIT), OSDI 08
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Develop a tool for the automated synthesis of Custom Kernel Library ... Project was aimed at developing to automate the ... final bootable binary. HOW ...
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Announcements Keep those group emails coming What I learned from Who s who forms Objective of the lecture Abstractions provided by OS system call interface
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Data storage Single Indirect. Data storage Double Indirect. 4KB data ... Works on an unopened file. Simply copy verbatim from GOSFS_Dir_Entry. SYS_FSTAT ...
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Data storage Direct Mapping. Data storage Single Indirect. 4KB data block ... Simply copy verbatim from GOSFS_Dir_Entry. SYS_SEEK. Seek(int fd, int offset) ...
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How do we evaluate the security of a host-based IDS ... Conservative design ... Can take control of app undetected [Conservative design ] Disguising the Payload ...
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MOPS: an Infrastructure for Examining Security Properties of Software Authors: Hao Chen, David Wagner University of California at Berkeley Publish: ACM Computer and ...
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RaceGuard: Kernel Protection From Temporary File Race Vulnerabilities ... Primary goal of Forensix is the post-mortem analysis of system activities. ...
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Week 7 System Calls, Kernel Threads, Kernel Debugging Sarah Diesburg Florida State University *
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Forensic Toolkit. Helix. tend to focus on dead data. only useful if malware hits the disk ... be the platform for forensic sound analysis of data from live systems ...
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2-Dining Puppies Mutex Failure
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Return value only indicate success (0) or failure (nonzero) ... 'Stuff that you could run from a Unix prompt' ls(1), cp(1), bash(1), kill(1) ...
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Create new win brand, that supports execution of Windows applications on top of ... return (fd); 9. Project progress. Set of scripts for convenient brand testing ...
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Sarah Diesburg & Louis Brooks Introduction Previous Work St. Michael Design Philosophy What we monitor System Call Mappings System Call Integrity Module Hiding ...
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Detection, Prevention, and Containment: A Study of grsecurity Brad Spengler http://www.grsecurity.net spender@grsecurity.net The Problem Bugs in software cause ...
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TAU: Recent Advances. KTAU: Kernel-Level Measurement for Integrated Parallel Performance Views ... Ktau-Off: Kernel patched with Ktau and instrumentations compiled-in. ...
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PlanetLab Software Overview. Mark Huang. mlhuang@cs.princeton.edu. PlanetLab CVS ... Mail, Support (RT), DNS, Monitor, Build, CVS, QA. Boot CD. Version 3 Boot ...
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System Interface
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Before process p resumes execution in user mode, kernel checks for ... Process first executes signal handler in user mode before resuming 'normal' execution. ...
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Emulate running guest OS on real hardware. Use actual hardware where you can ... Could be caused by any ALU op (damn CISC) Classical virtualisation and x86 ...
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What happens if a functions requires more parameters than you have registers? What is a parameter won't fit in a register? An entire struct for example? ...
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Linux Overview Anand Sivasubramaniam Dept. of Computer Science & Eng. The Pennsylvania State University Why Linux? It s free! Open Source (modifiability ...
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Runtime Processor Power Monitoring VICE VERSA 07/18/2003 Talk Canturk ISCI
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From the code necessary for infections' missions ' ... Find API calls for malicious behavior (M-calls) Identify their call sites through stack walking ...
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Cooperating processes often need to send information between themselves ... UNIX uses two system calls to start up a different program ...
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Caught by Single-stepping Checks. No. Yes. Uses INT 3's and Debug ... Caught by Registration-based Debugger Checks (e.g. Ptrace(), signal()) Helikaon. Debugger ...
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Time functions. September 6, 2005. CSCE 510 Systems Programming. 2. CSCE 510 Fall 2005 ... setenv-does not remove old entry if overwrite = 0 ...
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Title: Security and Privacy Technologies Subject: Exploiting memory Author: Vitaly Shmatikov Last modified by: UTCS-SHMAT Created Date: 9/7/1997 8:51:32 PM
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Configuration-free operation. Complete protection against all forms of address space modification bugs ... Domain-based authentication support. Performance ...
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Each PHP script is compiled only once for each revision. ... Stripping PHP binaries and/or modules on average makes them 20-30% smaller. ...
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... produce different result than serial execution. In fact, execution not necessarily equivalent with any ... Dynamic table checked and updated during execution ...
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wait() blocks the caller. Using wait() one cannot choose a specific process to be 'waited' waitpid() does not block the caller if WNOHANG option is used ...
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But this technique still works for backward compatibility. ... name,type1,arg1) type and name same as before. type1 : type of first argument. name1 : name of ...
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Recherche sur des binaires malicieux. Programmation d'outils li s la ... Actif avant PatchGuard. D sactivable par l'utilisateur. Drivers sign s ...
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Packing - Unpacking. Commands: Mad_pack(cnx, buffer, len, pack_mode, unpack_mode) ... Unpack. Apr s Unpack. Data is available. Data availability? ...
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first developed by Ken Thompson (Bell Lab) on PDP-7 (16 bit machine) ... truncate. need more contol? fcntl(fd, cmd); dup fd. examine and set file parameters ...
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Reading for today: Sections 5.1 5.4, (Jouppi article) Reading for ... Current SDRAM yield very high: 80% ENGS 116 Lecture 14. 6. Main Memory Performance ...
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This type of protection is the main reason MAC is built into operating systems ... protective measures for IDS assumes MAC in O/S is not sufficient protection ...
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This cycle happens for every include file, not just for the 'main' script. ... Opcode Cache Benchmarks. 4. Compiler Optimisations ...
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Ch.05 outline. Basic concepts. CPU-I/O burst cycle. CPU scheduler. Preemptive scheduling ... Suggest a method of prediction for next CPU burst? homework ...
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ppc, s390, sh, sparc, sparc64. CS591 (Spring 2001) linux/drivers ... Saving registers on kernel mode stack. Invoking syscall service routine. ...
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If two machines are ... Modern Microsoft Excel Worksheet Disks and Files Gedankenagain Mechanics Communicating Machines Polling Versus Interrupts When ...
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Write the system call code as a kernel function. Be careful when reading/writing to user-space ... name1 : name of first argument _syscall1(void,foo,int,arg) ...
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... versions of Sebek work by hijacking the read() system call. Components. Data ... hijacking ... real-time re-patching/re-hijacking. Do local analysis as much as ...
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How does the User program pass control to the Operating System? Take control on ERROR ... Address. 12 Status Register. 13 Cause Register. 14 Exception Address ...
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Trap. error or exception occurred. may cause process to be moved to Exit state. Supervisor call ... Child inherits open file descriptors from the parent. ...
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TurboTax. Microsoft Greetings. Diablo II. Unable to detect the Play Disc? ... TurboTax. TurboTax checks the admins' group membership by SID-Compare ...
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... Sony PlayStation 2 console, and Sony PSP handheld system use MIPS processors. ... Instructions go here. Contains the beginning of the program. Data ...
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1-1. Introduction to Virtual Machines. From 'Virtual Machines' Smith and Nair. Chapter 1. Introduction. 1-2. Two fundamental notions in. computer system design ...
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The Art of Defiling. Defeating Forensic Analysis on Unix File Systems. the grugq. Overview ... 'Ladies and Gentlemen, I'm here to talk about FISTing' ...
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CSCE 930 Advanced Computer Architecture---- A Brief Introduction to CMP Memory Hierarchy & Simulators Dongyuan Zhan An Overview of CMP Research Tools The Commonly ...
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