[dpdk-dev] [PATCH v1 1/1] app/procinfo: buffer null termination fix.

[Bruce Richardson]

On Sat, May 06, 2017 at 11:03:47AM +0200, Thomas Monjalon wrote:
> 21/04/2017 17:06, Roman Korynkevych:
> > Coverity issue: 143252
> > Fixes: 2deb6b5246d7706448d070335b329d1acb754cee ("app/procinfo: add collectd format and host id")
> > Cc: stable at dpdk.org
> > 
> > Signed-off-by: Roman Korynkevych <romanx.korynkevych at intel.com>
> > ---
> >  app/proc_info/main.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/app/proc_info/main.c b/app/proc_info/main.c
> > index 16b27b2..97d0352 100644
> > --- a/app/proc_info/main.c
> > +++ b/app/proc_info/main.c
> > @@ -189,7 +189,7 @@ proc_info_preparse_args(int argc, char **argv)
> >  				proc_info_usage(prgname);
> >  				return -1;
> >  			}
> > -			strncpy(host_id, argv[i+1], sizeof(host_id));
> > +			strncpy(host_id, argv[i+1], sizeof(host_id)-1);
> 
> The full array size should be given to strncpy.
> However, the call to gethostname below seems wrong as
> it does not use the full size.
> 
> Maryam, Reshma,
> Please review the procinfo patches.

Strncpy is dangerous and should not be used in DPDK. Ideally, I'd like
to see us start using strlcpy(), but in the meantime the best practice
in DPDK seems to be to use snprintf in place of strcpy/strncpy.

/Bruce