linux-hardening - Re: [PATCH] net: bonding: Use strscpy() instead of manually-truncated strncpy()

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Date:   Wed, 2 Jun 2021 12:46:46 -0700
From:   Rao Shoaib <rao.shoaib@...cle.com>
To:     Kees Cook <keescook@...omium.org>,
        Jay Vosburgh <j.vosburgh@...il.com>
Cc:     kernel test robot <lkp@...el.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] net: bonding: Use strscpy() instead of manually-truncated
 strncpy()

Would it make sense to also replace the other strncpy in the same file.

Shoaib

On 6/2/21 11:11 AM, Kees Cook wrote:
> Silence this warning by just using strscpy() directly:
>
> drivers/net/bonding/bond_main.c:4877:3: warning: 'strncpy' specified bound 16 equals destination size [-Wstringop-truncation]
>      4877 |   strncpy(params->primary, primary, IFNAMSIZ);
>           |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Reported-by: kernel test robot <lkp@...el.com>
> Link: https://lore.kernel.org/lkml/202102150705.fdR6obB0-lkp@intel.com
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>   drivers/net/bonding/bond_main.c | 6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index c5a646d06102..ecfc48f2d0d0 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -5329,10 +5329,8 @@ static int bond_check_params(struct bond_params *params)
>   			(struct reciprocal_value) { 0 };
>   	}
>   
> -	if (primary) {
> -		strncpy(params->primary, primary, IFNAMSIZ);
> -		params->primary[IFNAMSIZ - 1] = 0;
> -	}
> +	if (primary)
> +		strscpy(params->primary, primary, sizeof(params->primary));
>   
>   	memcpy(params->arp_targets, arp_target, sizeof(arp_target));
>