Re: [dpdk-dev] [PATCH 5/5] examples_ip_pipeline: fix possible string overrun

["Dumitrescu, Cristian" <cristian.dumitrescu@intel.com>]

> -----Original Message-----
> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> Sent: Tuesday, September 1, 2015 4:59 AM
> To: Dumitrescu, Cristian
> Cc: dev@dpdk.org; Stephen Hemminger
> Subject: [PATCH 5/5] examples_ip_pipeline: fix possible string overrun
> 
> If a long name was passed the code would clobber memory with
> strcpy.
> 
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
>  examples/ip_pipeline/app.h  | 2 +-
>  examples/ip_pipeline/init.c | 5 +++--
>  2 files changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/examples/ip_pipeline/app.h b/examples/ip_pipeline/app.h
> index 521e3a0..1f6bf0c 100644
> --- a/examples/ip_pipeline/app.h
> +++ b/examples/ip_pipeline/app.h
> @@ -190,7 +190,7 @@ struct app_pktq_out_params {
>  #define APP_MAX_PIPELINE_ARGS                    PIPELINE_MAX_ARGS
> 
>  struct app_pipeline_params {
> -	char *name;
> +	const char *name;
>  	uint8_t parsed;
> 
>  	char type[APP_PIPELINE_TYPE_SIZE];
> diff --git a/examples/ip_pipeline/init.c b/examples/ip_pipeline/init.c
> index 75e3767..007af83 100644
> --- a/examples/ip_pipeline/init.c
> +++ b/examples/ip_pipeline/init.c
> @@ -1022,12 +1022,13 @@ app_init_msgq(struct app_params *app)
>  }
> 
>  static void app_pipeline_params_get(struct app_params *app,
> -	struct app_pipeline_params *p_in,
> +	const struct app_pipeline_params *p_in,
>  	struct pipeline_params *p_out)
>  {
>  	uint32_t i;
> 
> -	strcpy(p_out->name, p_in->name);
> +	strncpy(p_out->name, p_in->name, PIPELINE_NAME_SIZE - 1);
> +	p_out->name[PIPELINE_NAME_SIZE - 1] = '\0';

Could be done, but not necessary, as the pipeline name string was already validated in the parser module; now it is just copied over, and it is safe to assume it of right size.

I don't mind doing it for extra safety.

> 
>  	p_out->socket_id = (int) p_in->socket_id;
> 
> --
> 2.1.4