linux-kernel - Re: [PATCH 1/3] net: ethernet: bcmasp: fix possible OOB write in bcmasp_netfilt_get_all

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Message-ID: <7b42e1ca549f8d7d18a4df9d74a93cf527071a4d.camel@redhat.com>
Date:   Thu, 07 Sep 2023 11:44:46 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Hangyu Hua <hbh25y@...il.com>, justin.chen@...adcom.com,
        florian.fainelli@...adcom.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, mw@...ihalf.com,
        linux@...linux.org.uk, nbd@....name, john@...ozen.org,
        sean.wang@...iatek.com, Mark-MC.Lee@...iatek.com,
        lorenzo@...nel.org, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com,
        maxime.chevallier@...tlin.com, nelson.chang@...iatek.com
Cc:     bcm-kernel-feedback-list@...adcom.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/3] net: ethernet: bcmasp: fix possible OOB write in
 bcmasp_netfilt_get_all_active()

On Wed, 2023-09-06 at 17:21 +0800, Hangyu Hua wrote:
> rule_locs is allocated in ethtool_get_rxnfc and the size is determined by
> rule_cnt from user space. So rule_cnt needs to be check before using
> rule_locs to avoid OOB writing or NULL pointer dereference.
> 
> Fixes: c5d511c49587 ("net: bcmasp: Add support for wake on net filters")
> Signed-off-by: Hangyu Hua <hbh25y@...il.com>
> ---
>  drivers/net/ethernet/broadcom/asp2/bcmasp.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp.c b/drivers/net/ethernet/broadcom/asp2/bcmasp.c
> index d63d321f3e7b..4df2ca871af8 100644
> --- a/drivers/net/ethernet/broadcom/asp2/bcmasp.c
> +++ b/drivers/net/ethernet/broadcom/asp2/bcmasp.c
> @@ -535,6 +535,9 @@ void bcmasp_netfilt_get_all_active(struct bcmasp_intf *intf, u32 *rule_locs,
>  	int j = 0, i;
>  
>  	for (i = 0; i < NUM_NET_FILTERS; i++) {
> +		if (j == *rule_cnt)
> +			break;

Side note: it's a bit unfortunate/confusing that the drivers can
arbitrary return  -EMSGSIZE or silently truncate the list. I think it
would be clearer if we could stick to single behavior - and I'll vote
for -EMSGSIZE.

Cheers,

Paolo