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Special Forums Cybersecurity Attacking Potential of sh-scripts Post 302509527 by hergp on Thursday 31st of March 2011 02:40:12 AM
Old 03-31-2011
Kornshell 93 has a long list of commands built into the shell for performance reasons. So if you execute chmod in ksh93, you don't need the external chmod program. Sometimes you need to call chmod with a full pathname, but that is not much of an obstacle.

Code:
$ type chmod
chmod is a tracked alias for /usr/bin/chmod
$ type /usr/ast/bin/chmod
/usr/ast/bin/chmod is a shell builtin

(from Opensolaris' ksh)

I don't think, chroot will help you much in this case. The only solution I can think of, is to delete ksh93 or compile your own version without builtins - which will result in slower execution of shellscripts.
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GZEXE(1)						      General Commands Manual							  GZEXE(1)

NAME
gzexe - compress executable files in place SYNOPSIS
gzexe name ... DESCRIPTION
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``gzexe /usr/bin/gdb'' it will create the following two files: -rwxr-xr-x 1 root root 1026675 Jun 7 13:53 /usr/bin/gdb -rwxr-xr-x 1 root root 2304524 May 30 13:02 /usr/bin/gdb~ /usr/bin/gdb~ is the original file and /usr/bin/gdb is the self-uncompressing executable file. You can remove /usr/bin/gdb~ once you are sure that /usr/bin/gdb works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
gzip(1), znew(1), zmore(1), zcmp(1), zforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some standard utilities (basename, chmod, ln, mkdir, mktemp, rm, sleep, and tail). BUGS
gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. GZEXE(1)
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