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Special Forums Cybersecurity basic shellcode - why it runs on my system, if .data is not executable Post 302656363 by jim mcnamara on Thursday 14th of June 2012 02:54:40 PM
Old 06-14-2012
Because you change what is on the stack at exit.

Try reading J Koziol 'Shellcoders Handbook'. If I were you I'd avoid phrack.
 

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JZIP(6) 						 John's Z-code Interpreter Program						   JZIP(6)

NAME
jzip - execute Infocom v1-5 and Inform v1-5 & v8 game files SYNOPSIS
jzip [ options ] z-file-name DESCRIPTION
jzip invokes the Z-code Interpreter. REQUIREMENTS
jzip will run under most (if not all) flavors of Unix, including AIX, Solaris, SunOS, HP/UX, Linux, Free/NetBSD, IRIX, NeXT Mach, DEC OSF/1, and others. EDITING
JZip now supports arrowkey editing in UNIX. Up/Down selects the previous / next command in history Left/Right moves the cursor over the line. Backspace deletes Typing inserts under the cursor OPTIONS
-l n lines in display -c n columns in display -r n text right margin (default = 1) -t n text top margin (default = 0) -v display version information -m monochrome mode -y set Tandy bit -s n zmachine strict level, from 0 (none), 1 (report once, recommended) to 3. ENVIRONMENT
jzip looks for the environment variable INFOCOM_PATH and will use the path found there to look for the story file specified on the command line if the story file cannot be found in the current directory. CREDITS
jzip is written and maintained by John Holder (j-holder@home.com), based on the ZIP v2.0 sources by Mark Howell and Olaf 'Olsen' Barthel. AVAILABILITY
The most recent version of jzip can be downloaded from one of: http://www.jzip.sourceforge.net/ ftp://ifarchive.org/infocom/interpreters/zip/ FILES
/usr/games/jzip The Z-Code Interpreter Program /usr/lib/games/zfiles Recommended location for Zcode files RELATED USENET NEWSGROUPS
Interactive Fiction (IF) authors should check out rec.arts.int-fiction, and IF players should check out rec.games.int-fiction. 2.1 JZIP(6)
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