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

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Message-ID: <20240208121128.GI1435458@kernel.org>
Date: Thu, 8 Feb 2024 12:11:28 +0000
From: Simon Horman <horms@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: Sam Creasey <sammy@...my.net>, "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 Tue, Feb 06, 2024 at 08:16:54AM -0800, 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: Simon Horman <horms@...nel.org>
Tested-by: Simon Horman <horms@...nel.org> # build-tested

...