linux-hardening - Re: [PATCH] net/sun3_82586: Avoid reading past buffer in debug output

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Date: Thu, 8 Feb 2024 08:12:09 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, Sam Creasey <sammy@...my.net>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 "Gustavo A . R . Silva" <gustavoars@...nel.org>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] net/sun3_82586: Avoid reading past buffer in debug output



On 2/6/24 10:16, Kees Cook wrote:
> Since NUM_XMIT_BUFFS is always 1, building m68k with sun3_defconfig and
> -Warraybounds, this build warning is visible[1]:
> 
> drivers/net/ethernet/i825xx/sun3_82586.c: In function 'sun3_82586_timeout':
> drivers/net/ethernet/i825xx/sun3_82586.c:990:122: warning: array subscript 1 is above array bounds of 'volatile struct transmit_cmd_struct *[1]' [-Warray-bounds=]
>    990 |                 printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status));
>        |                                                                                                               ~~~~~~~~~~~~^~~
> ...
> drivers/net/ethernet/i825xx/sun3_82586.c:156:46: note: while referencing 'xmit_cmds'
>    156 |         volatile struct transmit_cmd_struct *xmit_cmds[NUM_XMIT_BUFFS];
> 
> Avoid accessing index 1 since it doesn't exist.
> 
> Link: https://github.com/KSPP/linux/issues/325 [1]
> Cc: Sam Creasey <sammy@...my.net>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: Gustavo A. R. Silva <gustavoars@...nel.org>
> Cc: netdev@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks!
-- 
Gustavo

> ---
>   drivers/net/ethernet/i825xx/sun3_82586.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/i825xx/sun3_82586.c b/drivers/net/ethernet/i825xx/sun3_82586.c
> index 5e27470c6b1e..f2d4669c81cf 100644
> --- a/drivers/net/ethernet/i825xx/sun3_82586.c
> +++ b/drivers/net/ethernet/i825xx/sun3_82586.c
> @@ -987,7 +987,7 @@ static void sun3_82586_timeout(struct net_device *dev, unsigned int txqueue)
>   	{
>   #ifdef DEBUG
>   		printk("%s: xmitter timed out, try to restart! stat: %02x\n",dev->name,p->scb->cus);
> -		printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status));
> +		printk("%s: command-stats: %04x\n", dev->name, swab16(p->xmit_cmds[0]->cmd_status));
>   		printk("%s: check, whether you set the right interrupt number!\n",dev->name);
>   #endif
>   		sun3_82586_close(dev);