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Setjmp, Longjmp int setjmp(jmp_buf env); void longjmp(jmp_buf env, int val); Useful functions for dealing with errors and interrupts setjmp saves its environment (i.e ...
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Restores register context from jump buffer env. Jumps back to where previous setjmp is called, behaves like setjmp just completes. ...
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nonlocal jumps (setjmp/longjmp) these higher level mechanisms are implemented by either: ... Nonlocal jumps: setjmp()/longjmp ... setjmp implementation: ...
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setjmp remembers the current location and the stack frame ... Allocate a separate space for every procedure incarnation. Relative addresses ...
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Be sure to work with the disassembly code view and NOT just the C view. ... Get a disassembly view and copy the setjmp and longjmp code (only), into a text file. ...
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nonlocal jumps (setjmp/longjmp) Implemented by either: OS software (context switch and signals). C language runtime library: nonlocal jumps. 33. Exceptions ...
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Fault tolerant environment built for PVM. ... Local state of the tasks are restored using setjmp() and longjmp() calls. ... An lseek call provides the file pointer. ...
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Nonlocal jumps (setjmp/longjmp) ignored in this course. Implemented by either: ... C language runtime library: nonlocal jumps. 5. CS 105. Exceptions ...
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An Open Framework for Certified System Software Xinyu Feng Yale University
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Canary. Place a 'canary' word next to the return address on the stack. ... Canary. 0 (null), CR, LF, -1 (EOF) When the program reach the termination canary , ...
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Reutilizaci n de c digo hecho y probado. Acceso al Sistema Operativo ... math.h matem ticas sobre double. sin (x), cos (x), asin (x), acos (x), exp (x), log (x) ...
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An exception is a transfer of control to the OS in response to ... Use kill to forcibly terminate children. void fork12() pid_t pid[N]; int i; int child_status; ...
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Title: Exceptional Control Flow II Author: Randal E. Bryant and David R. O'Hallaron Last modified by: Valued Sony Customer Created Date: 8/11/1998 9:19:24 AM
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Lecture 16. Signals. Topics. Shell operations. Shell ... CSCE 510 Fall 2005. Zombies and Fireman. signal(SIGCHLD, fireman); /* this eliminates zombies ...
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abort with core dump. Advanced Programming. Spring 2002. 10. signal ... Scripts typically deliver HTML, but can provide any data (say, video clip) ...
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runs concurrently with other processes (multitasking) ... save current process context (in case of abortive return) invoke appropriate function in kernel ...
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dual-core Opteron, Athlon X2. Four-core Opteron. Sun: UltraSparc T1: 32 cores ... Dual-core Opteron. use CMP for single-threaded applications through parallelization ...
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Boot Disk / CD / Floppy. BIOS ROM. 0xffff0000. 10. 15-213, F'06. Some PC Start-up Details ... Boot Disk / CD / Floppy. BIOS ROM. 0xffff0000. 0x00007c00 ...
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Idea used in GNU Portable Threads library. Design Principles ... Involves saving/restoring of the machine contexts of tasks/threads. ...
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... way: create a dummy class and variable whose sole purpose ... Exception Class Clonability ... class Parent { // do you think it will throw an exception? public: ...
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No overhead for try..catch blocks ... May need to walk up through several enclosing try..catch blocks until right one is found ...
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Using Continuations to Implement Thread Management and Communication in ... the thread is 'resumed' when this function is later called by the scheduler ...
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Exception handling is a relatively new addition to the C and still not ... occur many levels deep, rather than unwinding the sequence of calls, better to ...
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Hardware and operating system kernel software. Concurrent processes ... a shell to start the window manger. 13. 15-213, F'04. Shell Programs ...
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http://ourworld.compuserve.com/homepages/KanjiFlash/BPTour.htm ... Terminate & Dump. SIGSEGV. 11. 17. 9. 2. ID. Child stopped or terminated. Ignore. SIGCHLD ...
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2. Bootstrap program loads the boot block (disk block 0). 3. Boot block program loads kernel binary (e.g., /boot/vmlinux) 4. Boot block program passes control to ...
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Process 0: handcrafted kernel process. Child process 1 execs /sbin/init ... 5. Kernel handcrafts the data structures for process 0. Process 0 forks child process 1 ...
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Black Hat USA 2004. Introduction. Computer ... Difficult to implement because some glibc functions are written in assembly ... Compiles GLIBC successfully ...
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Represent the system call trace as a non-deterministic finite automaton (NDFA) ... paths (by characterizing more precisely the set of possible syscall traces) ...
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ECF Exists at All Levels of a System. Exceptions. Hardware and ... Daemons. e.g. ftpd, httpd /etc/inittab. init forks and execs daemons per /etc/inittab, ...
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UNIX PROCESSES MAIN FUNCTION PROTOTYPE: int main(int argc, char *argv[ ]); Argc is the number of command line arguments argv [ ] is an array ...
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... will be creating code for context switching and stack initialization ... CS415 Project 2: Context Switching and Stack Initialization. Threads and their stacks ...
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Constrains the system call trace of a program's execution to be consistent with ... Threads. CARES.SNU. 12. Optimizations. Irrelevant systems calls ...
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Only writing the active' areas of the stack and heap provides dead memory opt. ... Heap items might have been de-allocated. Regions of memory might be dead or clean ...
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State consists of memory image register values program counter ... PID TTY STAT TIME COMMAND. 24788 pts/2 S 0:00 -usr/local/bin/tcsh -i ...
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Buffer overflows allow a remote attacker to hijack control ... glibc pointer arithmetic: eax src, esi - dest. mov %esi, ìx. sub êx, ìx. mov êx, íx ...
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Buffer overflow attacks. Integer overflow attacks. Format string vulnerabilities ... Exploiting buffer overflows. Suppose web server calls func() with given URL. ...
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Podstawy programowania Adam Naumowicz Sprawy formalne 30 godz. wyk adu + 30 godz. wicze (15 godz. w laboratorium) zaliczenie laboratorium i egzamin obecno na ...
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On the Conformance of a Cluster Implementation of the Java Memory Model Philip J. Hatcher University of New Hampshire Philip.Hatcher@unh.edu
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Control Hijacking Attacks Buffer overflows and format string bugs
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Ways to catch and handle run-time errors in programming languages that do not ... exception also handles exceptions that are descendents of that exception class ...
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Call gates are used for cross-domain calls, which cross protection domain boundaries. ... Returns are paired with calls. Works for callbacks. Works for closures. ...
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ANSI C source code is portable. No JVM needed. ... code bloat. Generate separate library trimmed for each application. still takes a long time. ...
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Title: CS 380S - Theory and Practice of Secure Systems Subject: Address space layout randomization Author: Vitaly Shmatikov Last modified by: Vitaly Shmatikov
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Canary = 0, newline, linefeed, EOF. String functions will not copy beyond terminator. ... Random canary. Triggers UnHandledException in case of Canary mismatch ...
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Title: Linear Control By Example Author: Mary Last modified by: Jack Created Date: 3/3/2003 5:30:13 PM Document presentation format ...
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Using DISE to Protect Return Addresses from Attack ... Programmable instruction macro-expander. Like hardware SED (DISE = dynamic instruction SED) ...
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Exceptions, Interrupts, and Timers 10.1 Exception Handling and Signals Interrupt Service Routines Timers Exception Handling Overview An exception is an unplanned ...
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Motivation for threads. Faster performance, easier on the ... sigsetjmp() is not thread safe ... fork() rather than threads, where possible. Things to take home ...
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Exceptional Control Flow Part I Topics Exceptions Process context switches Creating and destroying processes class16.ppt
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1. Parameter Passing, Generics and Polymorphism, Exceptions. COMP 144 Programming ... b is byval so it is essentially a local variable ...
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Embeds 'canaries' in stack frames and verify their integrity ... Canary = 0 (null), newline, linefeed, EOF. String functions will not copy beyond terminator. ...
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... continuation expecting a value of type a. throw: a cont - a - b throws control to continuation, ... callcc f invokes f passing it the current continuation ...
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Activation Records Professor Yihjia Tsai Tamkang University Outline of this lecture Operations on routines Properties of variables, L-Values, R-Values Stack Frames ...
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Creates architecture entirely in software including the instruction set ... take a collection of class files that compose a program, and compile them into a ...
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Preventing Buffer Overflow Attacks Some unsafe C lib functions strcpy (char *dest, const char *src) strcat (char *dest, const char *src) gets (char *s) scanf ( const ...
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