basic exploit coding on solaris sparc

[Fabio <fabio () crearium com>]

Hi.

I am trying to learn Solaris Sparc assembly and how exploits works on 
this architecture. I have a setuid root binary that has the following bug:

#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

main(int argc,char *argv[])
{
char buffer[40];
char buffarg[20];
char *mailpath;
      strcpy(buffer,"/var/mail/");
      if (argc == 2)
      {
              strcpy(buffarg,argv[1]);
              mailpath=strcat(buffer,buffarg);
              printf("\nRemoving: %s\n",mailpath);
              if(!unlink(mailpath))
              {
                      printf("Mailbox: %s  delete\n\n", mailpath);

              }
        }
}

I found this shellcode (120 bytes long)

http://shellcode.org/Shellcode/Solaris/solaris-sparc-shellcode.html

the behavoir is the following:

nietzsche% ./b `perl -e 'print "A" x 1000'`
Segmentation fault (core dumped)
nietzsche% ./b `perl -e 'print "A" x 24'`
Segmentation fault (core dumped)

The less value without core dump is 23.

I am interested in code a exploit that execute a root shell, on 
'smashing the stack' article they refer to Linux and x86, so I cant see 
information about sparc and register windowing.

Anyone can help me to reproduce a exploit for the sample provided?

Thanks in advance.

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