linux-hardening - Re: [PATCH 1/3] scsi: fcoe: Statically initialize flogi

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Date:   Fri, 28 May 2021 11:29:59 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Joe Perches <joe@...ches.com>
Cc:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        Hannes Reinecke <hare@...e.de>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Bradley Grove <linuxdrivers@...otech.com>,
        Artur Paszkiewicz <artur.paszkiewicz@...el.com>,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH 1/3] scsi: fcoe: Statically initialize flogi_maddr

On Fri, May 28, 2021 at 11:28:59AM -0700, Joe Perches wrote:
> On Fri, 2021-05-28 at 11:13 -0700, Kees Cook wrote:
> > In preparation for FORTIFY_SOURCE performing compile-time and run-time
> > field bounds checking for memcpy() using memcpy() with an inline const
> > buffer and instead just statically initialize the destination array
> > directly.
> []
> > diff --git 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];
> > +	u8 flogi_maddr[ETH_ALEN] = FC_FCOE_FLOGI_MAC;
> 
> static const
> 
> > @@ -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];
> > +	u8 flogi_maddr[ETH_ALEN] = FC_FCOE_FLOGI_MAC;
> 
> etc...

Hm, good point.

-- 
Kees Cook