Re: [dpdk-dev] [PATCH v1] examples/vm_power: fix strcpy buffer overrun

[Bruce Richardson <bruce.richardson@intel.com>]

On Fri, Jul 12, 2019 at 03:04:02PM +0100, David Hunt wrote:
> replace strcpy with rte_strlcpy to prevent buffer overrun
> With fix, attempting to use a VERY lonng vm name results in a nicely
> truncated 32 character name rather than a segfault:
> Setting VM Name to [sdfdsfsfsdffdsdsasdsadasdakjshd]
> 
> Cc: stable@dpdk.org
> Fixes: 59287933a0bb ("examples/vm_power: add options to guest app")
> Signed-off-by: David Hunt <david.hunt@intel.com>
> ---
>  examples/vm_power_manager/guest_cli/main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/examples/vm_power_manager/guest_cli/main.c b/examples/vm_power_manager/guest_cli/main.c
> index 36365b124..a18eb214a 100644
> --- a/examples/vm_power_manager/guest_cli/main.c
> +++ b/examples/vm_power_manager/guest_cli/main.c
> @@ -65,7 +65,7 @@ parse_args(int argc, char **argv)
>  		switch (opt) {
>  		/* portmask */
>  		case 'n':
> -			strcpy(policy->vm_name, optarg);
> +			rte_strlcpy(policy->vm_name, optarg, VM_MAX_NAME_SZ);
>  			printf("Setting VM Name to [%s]\n", policy->vm_name);
>  			break;
>  		case 'b':
> -- 

You can just use "strlcpy" without the "rte_" prefix. The rte_ version is
just a fallback used when a standard strlcpy - either natively or from
libbsd - is unavailable.