linux-kernel - RE: [PATCH V2] hippi: fix possible buffer overflow caused by bad DMA value in rr_start

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Message-ID: 
 <BY3PR18MB47379D136DE21EDB8C1741CAC6C92@BY3PR18MB4737.namprd18.prod.outlook.com>
Date: Fri, 21 Jun 2024 05:11:41 +0000
From: Sunil Kovvuri Goutham <sgoutham@...vell.com>
To: Huai-Yuan Liu <qq810974084@...il.com>,
        "jes@...ined-monkey.org"
	<jes@...ined-monkey.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org"
	<kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>
CC: "linux-hippi@...site.dk" <linux-hippi@...site.dk>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "baijiaju1990@...il.com" <baijiaju1990@...il.com>
Subject: RE: [PATCH V2] hippi: fix possible buffer overflow caused by bad DMA
 value in rr_start_xmit()

>The value rrpriv->info->tx_ctrl is stored in DMA memory, and it is assigned to txctrl,
>so txctrl->pi can be modified at any time by malicious hardware. Becausetxctrl->pi is
>assigned to index, buffer overflow may occur when the code "rrpriv-
>>tx_skbuff[index]" is executed.
>
>To address this issue, the index should be checked.
>
>Fixes: f33a7251c825 ("hippi: switch from 'pci_' to 'dma_' API")
>Signed-off-by: Huai-Yuan Liu <qq810974084@...il.com>
>---
>V2:
>* In patch V2, we remove the first condition in if statement and use
>  netdev_err() instead of printk().
>  Thanks Paolo Abeni for helpful advice.
>---
> drivers/net/hippi/rrunner.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
>diff --git a/drivers/net/hippi/rrunner.c b/drivers/net/hippi/rrunner.c index
>aa8f828a0ae7..6b0056ced922 100644
>--- a/drivers/net/hippi/rrunner.c
>+++ b/drivers/net/hippi/rrunner.c
>@@ -1440,6 +1440,11 @@ static netdev_tx_t rr_start_xmit(struct sk_buff *skb,
> 	txctrl = &rrpriv->info->tx_ctrl;
>
> 	index = txctrl->pi;
>+	if (index >= TX_RING_ENTRIES) {
>+		netdev_err(dev, "invalid index value %02x\n", index);

Much better would be to use netif_msg_tx_err which can be enabled/disabled instead of dumping on console,
which would be annoying if there are many errors.

Thanks,
Sunil.