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Full Discussion: Passing arguments to shellcode
Top Forums Programming Passing arguments to shellcode Post 302528778 by image28 on Wednesday 8th of June 2011 04:03:23 AM
Old 06-08-2011
Passing arguments to shellcode
Is there any way I could pass arguments to shellcode. My goal is to store a program in a image file, and have another program read and run the code with arguments in memory.

Currently I can store a program in a image file, then read it back to the hard-drive run it normally then delete it when it's done running, but I'm worried someone could undelete the program.

---------- Post updated at 08:03 PM ---------- Previous update was at 06:23 PM ----------

Tried the following code, the shellcode prints a string in argc < 2 or prints argv[1] if there is an argument. Code bellow.

Code:
unsigned char shellcode[] = 
"\xeb\x0d\x5e\x31\xc9\xb1\x3f\x80\x36\x02\x46\xe2\xfa\xeb\x05\xe8\xee\xff\xff\xff\x57\x8b\xe7\x81\xee\x12\x81\x7f\x0a\x03\x7c\x1e\x89\x47\x0e\x89\x4a\x06\xba\x06\x02\x02\x02\x8b\xc0\x51\xb9\x03\x02\x02\x02\xcf\x82\x59\x33\xc2\xcb\xc1\x64\x92\x8f\x4f\xfe\xba\x06\x02\x02\x02\x8b\xc0\x51\xb9\x03\x02\x02\x02\xcf\x82\x59\x33\xc2\xcb\xc1";

int main(int argc, char *argv[]) 
{
    int (*func)(int, char**) = shellcode;
    (*func) (argc, argv);
}

when compiled it gets an warning,
Code:
test.c.tst.c:6:29: warning: initialization from incompatible pointer type

and segfaults when resulting program is run.

shellcode is genorated with shellforge using code bellow.
Code:
#include "include/sfsyscall.h"

int main(int argc, char *argv[])
{
    char string[5]="NEA\n";

    if ( argc < 2 )
    {
        write(1,string,sizeof(string));
    }else{
        write(1,argv[1], sizeof(argv[1]));
    }

    return(0);
}

Last edited by pludi; 06-08-2011 at 07:04 AM..
 

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LEARN ABOUT OSX

tk_main

Tk_Main(3)						       Tk Library Procedures							Tk_Main(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_Main - main program for Tk-based applications

SYNOPSIS

       #include <tk.h>

       Tk_Main(argc, argv, appInitProc)

ARGUMENTS

       int argc (in)				  Number of elements in argv.

       char *argv[] (in)			  Array of strings containing command-line arguments.

       Tcl_AppInitProc *appInitProc (in)	  Address  of  an  application-specific  initialization procedure.  The value for this argument is
						  usually Tcl_AppInit.
_________________________________________________________________

DESCRIPTION

       Tk_Main acts as the main program for most Tk-based applications.  Starting with Tk 4.0 it is not called main anymore because it is part	of
       the Tk library and having a function main in a library (particularly a shared library) causes problems on many systems.	Having main in the
       Tk library would also make it hard to use Tk in C++ programs, since C++ programs must have special C++ main functions.

       Normally each application contains a small main function that does nothing but invoke Tk_Main.  Tk_Main then does all the work of  creating
       and running a wish-like application.

       When  it  is  has  finished  its own initialization, but before it processes commands, Tk_Main calls the procedure given by the appInitProc
       argument.  This procedure provides a "hook" for the application to perform its own initialization, such	as  defining  application-specific
       commands.  The procedure must have an interface that matches the type Tcl_AppInitProc:
	      typedef int Tcl_AppInitProc(Tcl_Interp *interp);
       AppInitProc is almost always a pointer to Tcl_AppInit; for more details on this procedure, see the documentation for Tcl_AppInit.

KEYWORDS

       application-specific initialization, command-line arguments, main program

Tk									4.0								Tk_Main(3)
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