kern/174933: if_nameindex fail in linuxulator enviroment

[Martin Laabs]

>Number:         174933
>Category:       kern
>Synopsis:       if_nameindex fail in linuxulator enviroment
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jan 03 11:00:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Martin Laabs
>Release:        9.0-RELEASE-p3
>Organization:
>Environment:
reeBSD pc.martinlaabs.de 9.0-RELEASE-p3 FreeBSD 9.0-RELEASE-p3 #0: Tue Jun 12 02:52:29 UTC 2012     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
The function call if_nameindex out of the libc failes (return NULL) if it is called out of a linux application.
The cause of the failure is an inappropriate call of socket likely called in the __opensock function in the libc. This can be seen out of a ktrace dump:

[...]
3319 a.out    CALL  linux_socketcall(0x1,0xffffc6d4)
3319 a.out    RET   linux_socketcall -1 errno 97 Address family not supported by protocol family
[...]

The cause of the wrong arguments for this socket call is not known to me up to now.

For all the test I use the f10 linux environment. Tests with different linux-base versions are pending. Maybe someone who installed them can do it. On request I can send the linux binary compiled on debian with a 2.6.18 kernel and libc-2.3.6.
>How-To-Repeat:
Compile the following program on FreeBSD and Linux:
Check the return code - maybe the program will segfault if run as linux binary.

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <stdio.h>
#include <string.h>

int main(int argc, char *argv[])
{
     struct if_nameindex *ifn;
  
  /*Can be omitted - just to test if this makes a difference since
  the __opensock function remember the last socket options*/
  socket(AF_INET, SOCK_DGRAM, 0);

  ifn=if_nameindex();
  if(ifn==0) 
     err("if_nameindex failed\n"); 

 return 0;
}

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: