netdev - Re: [PATCH] net: ath10k: fix memcpy size from untrusted input

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Date:   Tue, 23 Jun 2020 07:44:08 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Zekun Shen <bruceshenzk@...il.com>
Cc:     unlisted-recipients:; (no To-header on input)
        Zekun Shen <bruceshenzk@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, ath10k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ath10k: fix memcpy size from untrusted input

Zekun Shen <bruceshenzk@...il.com> wrote:

> A compromized ath10k peripheral is able to control the size argument
> of memcpy in ath10k_pci_hif_exchange_bmi_msg.
> 
> The min result from previous line is not used as the size argument
> for memcpy. Instead, xfer.resp_len comes from untrusted stream dma
> input. The value comes from "nbytes" in ath10k_pci_bmi_recv_data,
> which is set inside _ath10k_ce_completed_recv_next_nolock with the line
> 
> nbytes = __le16_to_cpu(sdesc.nbytes);
> 
> sdesc is a stream dma region which device can write to.
> 
> Signed-off-by: Zekun Shen <bruceshenzk@...il.com>
> Signed-off-by: Kalle Valo <kvalo@...eaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

aed95297250f ath10k: pci: fix memcpy size of bmi response

-- 
https://patchwork.kernel.org/patch/11607461/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches