xinetd

[Michał Kaps]

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Witam,

Może ktoś puścić do updates nowe xinetd?

THE PROBLEM
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Using objdump -S /usr/sbin/xinetd, the block of code in question comes 
from service.c:

void svc_request( struct service *sp )
{
   connection_s *cp ;
   status_e ret_code;
                                                                           
     
   cp = conn_new( sp ) ;
   if ( cp == CONN_NULL )
      return ;
   if (sp->svc_not_generic)
           ret_code = spec_service_handler(sp, cp);
   else
           ret_code = svc_generic_handler(sp, cp);
                                                                           
     
   if ( ret_code != OK )
   {
      if ( SVC_LOGS_USERID_ON_FAILURE( sp ) )
         if( spec_service_handler( LOG_SERVICE( ps ), cp ) == FAILED ) {
            conn_free( cp, 1 );
            return;
         }
      CONN_CLOSE(cp);
   }
}

The above code has several problems. One background piece of information 
is that the sigchld handler in xinetd (child_exit->server_end-> 
svc_postmortem) normally frees the connection's data. If the ret_code is 
not OK, the connection was only closed. This is little more than close(cp-
>co_descriptor); This does not free cp since sigchld will not be called. 
It was only if the log service call failed that the connection was freed. 


SOLUTION
- --------

Xinetd 2.3.11 fixes the memory leaks as well as other problems discovered 
since 2.3.10 was released. All users of xinetd 2.3.10 are strongly urged 
to upgrade ASAP to avoid DOS conditions. Anyone running 2.3.9 is also 
strongly urged to upgrade since they are leaking file descriptors.
- -- 
Michał Kaps
FafNetowy SysAdmin 
Registered lmule user #19 :)

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