Block binary execution Post: 302872601

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Operating Systems Linux Red Hat Block binary execution Post 302872601 by Don Cragun on Friday 8th of November 2013 08:31:07 PM

11-08-2013

Registered User

It isn't easy to change the way an application behaves without changing the application.

I almost didn't post this, because the idea of trying to use a system that has been mangled like this is just abhorrent to me. And the same WARNINGS still apply: If you do this to any utility provided as part of your operating system, you may turn your computer into a doorstop.

But, here is a modified version of Jim's code that seems to do what you want. Save it in a file, make it executable, and invoke it with the name of one program to modify as its only argument:

Code:

cd /path/to/binaryfiles
mv "$1" "$1.real"
printf 'echo "You have permission to run %s."\nexec "$PWD/%s.real" "$@"\n' \
        "$1" "$1" > "$1"
chmod +x "$1"

Please do everything you can to convince whoever came up with this idea, that it is a horrible idea and should not be implemented. (Imagine how we'll the above script would work if printf wasn't a shell built-in and you used this script to change printf before you used it to change another program. Any program replaced by this script that has it's output redirected into a file will corrupt that file. Any program replaced by this script that is included in a pipeline will require that the next program in the pipeline be changed to discard the line that the modified program should never have printed.)

Don Cragun

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LEARN ABOUT SUNOS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a	Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.10							    30 Jan 2004 							 script(1)