# Is -1 my*

-rwxr-xr-x   1 root     other      24152  29 16:30 myprog

-rwxr-xr-x   1 root     other      24152  29 16:31 myprog2

# chmod 4755 myprog

# chmod u+s myprog2

# Is -1 my*

-rwsr-xr-x   1 root     other      24152 Apr 29 16:30 myprog

-rwsr-xr-x   1 root     other      24152 Apr 29 16:31 myprog2

 s         Is -1 (.
 "Is -1:   "  6) ,     setuid.

6.       ( ,  root, 
      ).   -
 root,      .

      root,   -
     .    
    ,    . . 
 "consolehelper:     root".

    ,    -
  .   (.  ""    )
, ,      .  /etc/securetty ,  
 (tty)      root.  /etc/security/access.conf
      ( .   ).

   root   Internet.  
root       login     
Red Hat Enterprise Linux  Fedora,    securetty  .
 /etc/security/access.conf      
   ,        
root.      access. conf .

      root    ,  
ssh (.  18).   ,     Red Hat,  ssh
     securetty  access, conf.  ,  
/etc/ssh/sshd_config Red Hat   PermitRootLogin  YES,
   root      ssh (. 
"  /ete/ssn/sshd_config"  18).

  

        -
  .        
 ,         
" "    ,       ,
  .

su:    

 su ("substitute user"   )    
        .  -
 su      ;   root   

396                                      IV.  