linux-hardening - Re: [PATCH v2] scsi: fcoe: Statically initialize flogi

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Date:   Wed, 2 Jun 2021 13:41:17 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Joe Perches <joe@...ches.com>, Hannes Reinecke <hare@...e.de>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-scsi@...r.kernel.org, linux-hardening@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] scsi: fcoe: Statically initialize flogi_maddr



On 6/2/21 13:00, Kees Cook wrote:
> In preparation for FORTIFY_SOURCE performing compile-time and run-time
> field bounds checking for memcpy() avoid using an inline const buffer
> argument and instead just statically initialize the destination array
> directly.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks
--
Gustavo

> ---
> v2:
>  - use "static const" (Joe)
> v1: https://lore.kernel.org/lkml/20210528181337.792268-2-keescook@chromium.org/
> ---
>  drivers/scsi/fcoe/fcoe.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
> index 89ec735929c3..5ae6c207d3ac 100644
> --- a/drivers/scsi/fcoe/fcoe.c
> +++ b/drivers/scsi/fcoe/fcoe.c
> @@ -293,7 +293,7 @@ static int fcoe_interface_setup(struct fcoe_interface *fcoe,
>  	struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
>  	struct netdev_hw_addr *ha;
>  	struct net_device *real_dev;
> -	u8 flogi_maddr[ETH_ALEN];
> +	static const u8 flogi_maddr[ETH_ALEN] = FC_FCOE_FLOGI_MAC;
>  	const struct net_device_ops *ops;
>  
>  	fcoe->netdev = netdev;
> @@ -336,7 +336,6 @@ static int fcoe_interface_setup(struct fcoe_interface *fcoe,
>  	 * or enter promiscuous mode if not capable of listening
>  	 * for multiple unicast MACs.
>  	 */
> -	memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
>  	dev_uc_add(netdev, flogi_maddr);
>  	if (fip->spma)
>  		dev_uc_add(netdev, fip->ctl_src_addr);
> @@ -442,7 +441,7 @@ static void fcoe_interface_remove(struct fcoe_interface *fcoe)
>  {
>  	struct net_device *netdev = fcoe->netdev;
>  	struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
> -	u8 flogi_maddr[ETH_ALEN];
> +	static const u8 flogi_maddr[ETH_ALEN] = FC_FCOE_FLOGI_MAC;
>  	const struct net_device_ops *ops;
>  
>  	/*
> @@ -458,7 +457,6 @@ static void fcoe_interface_remove(struct fcoe_interface *fcoe)
>  	synchronize_net();
>  
>  	/* Delete secondary MAC addresses */
> -	memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
>  	dev_uc_del(netdev, flogi_maddr);
>  	if (fip->spma)
>  		dev_uc_del(netdev, fip->ctl_src_addr);
>