@ -21,47 +21,84 @@ process.c. This is a good way to learn about clone() and ptrace().
int main ( void )
{
int n , pid , ret = 1 ;
void * stack ;
int n , pid , ret = 1 , cmdline_value ;
void * stack ;
struct ptrace_faultinfo {
int is_write ;
unsigned long addr ;
} ;
struct ptrace_faultinfo {
int is_write ;
unsigned long addr ;
} ;
struct ptrace_faultinfo fi ;
struct ptrace_faultinfo fi ;
printf ( " Checking for the skas3 patch in the host... " ) ;
pid = start_ptraced_child ( & stack ) ;
cmdline_value = host_cmdline ( ) ;
n = ptrace ( PTRACE_FAULTINFO , pid , 0 , & fi ) ;
if ( n < 0 ) {
if ( errno = = EIO )
printf ( " not found \n " ) ;
else printf ( " No (unexpected errno - %d) \ n " , errno) ;
ret = 0 ;
if ( cmdline_value = = 1 ) {
printf ( " Checking for the skas3 patch in the host...not found \n Checking for /proc/mm...not found \n " ) ;
return ( 0 ) ;
}
else if ( cmdline_value = = 2 ) {
printf ( " Checking for the skas3 patch in the host...found \n Checking for /proc/mm...found \n " ) ;
return ( 0 ) ;
}
else printf ( " found \n " ) ;
printf ( " Checking for /proc/mm... " ) ;
if ( access ( " /proc/mm " , W_OK ) ) {
printf ( " not found \n " ) ;
ret = 0 ;
}
else printf ( " found \n " ) ;
printf ( " Checking for the skas3 patch in the host... " ) ;
pid = start_ptraced_child ( & stack ) ;
n = ptrace ( PTRACE_FAULTINFO , pid , 0 , & fi ) ;
if ( n < 0 ) {
if ( errno = = EIO )
printf ( " not found \n " ) ;
else printf ( " No (unexpected errno - %d) \ n " , errno) ;
ret = 0 ;
}
else printf ( " found \n " ) ;
kill ( pid , SIGKILL ) ;
return ( ret ) ;
printf ( " Checking for /proc/mm... " ) ;
if ( access ( " /proc/mm " , W_OK ) ) {
printf ( " not found \n " ) ;
ret = 0 ;
}
else printf ( " found \n " ) ;
kill ( pid , SIGKILL ) ;
return ( ret ) ;
}
int threadFunction ( void * argument )
int host_cmdline ( void )
{
printf ( " child thread exiting \n " ) ;
exit ( 0 ) ;
char s [ 500 ] ; /* should be the max cmdline size */
FILE * f ;
char * tt = " mode=tt " ;
char * skas = " mode=skas " ;
char * ptt , * pskas ;
f = fopen ( " /proc/cmdline " , " r " ) ;
if ( f = = NULL ) {
printf ( " Error: unable to open /proc/cmdline for reading \n " ) ;
return ( 0 ) ;
}
if ( fgets ( s , sizeof s , f ) ! = NULL ) {
ptt = strstr ( s , tt ) ;
pskas = strstr ( s , skas ) ;
if ( ptt ! = NULL )
return ( 1 ) ;
else if ( pskas ! = NULL )
return ( 2 ) ;
else
return ( 0 ) ;
}
return ( 1 ) ; /* safety default */
}