On Mon, 13 Nov 2017, Steve Ellcey wrote:

> On Sun, 2017-11-12 at 16:49 -0700, Martin Sebor wrote:
> > 
> > PS I still don't see it discussed on the Linux man page but
> > I did find such a requirement on an AIX 6.1 ioctl man page:
> > https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_61/apis/ioct
> > l.htm
> > 
> > The descriptions of the if_indextoname and if_nametoindex
> > functions specified by RFC 3493 also talk about the name being
> > a nul-terminated string so it looks to me like you are correct
> > and the warning has found a Glibc bug.  Yay! :)
> 
> I think this is a bug and that if_nametoindex should check for a name
> that is too long.  Based on RFC 3493 it would appear that we don't need
> to set errno in this case though I am not sure if that is a correct
> interpretation.  I tested this patch:
> 
> 
> 2017-11-13  Steve Ellcey  <sellcey@cavium.com>
> 
> 	* sysdeps/unix/sysv/linux/if_index.c (__if_nametoindex):
> 	Check if ifname is too long.

Florian, any comments on the proper handling of too-long names here, and 
so on how we should avoid the strncpy warnings in this case?

-- 
Joseph S. Myers
joseph@codesourcery.com