linux-kernel - Re: [BUG] Possible Use-After-Free Vulnerability in ether3 Driver Due to Race Condition

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Message-ID: <tencent_50BA792913CC5DFE57798C1F@qq.com>
Date: Mon, 2 Sep 2024 19:37:41 +0800
From: "Wentai Deng" <wtdeng24@...udan.edu.cn>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: "davem" <davem@...emloft.net>, "edumazet" <edumazet@...gle.com>, "kuba" <kuba@...nel.org>, "pabeni" <pabeni@...hat.com>, "linux-arm-kernel" <linux-arm-kernel@...ts.infradead.org>, "netdev" <netdev@...r.kernel.org>, "linux-kernel" <linux-kernel@...r.kernel.org>, "杜雪盈" <21210240012@...udan.edu.cn>
Subject: Re: [BUG] Possible Use-After-Free Vulnerability in ether3 Driver Due to Race Condition

Apologies for sending the email in the wrong format. I'll correct it and resend it shortly.

  ------------------ Original ------------------From:  "Russell King (Oracle)"<linux@...linux.org.uk>;Date:  Mon, Sep 2, 2024 05:23 PMTo:  "Wentai Deng"<wtdeng24@...udan.edu.cn>; Cc:  "davem"<davem@...emloft.net>; "edumazet"<edumazet@...gle.com>; "kuba"<kuba@...nel.org>; "pabeni"<pabeni@...hat.com>; "linux-arm-kernel"<linux-arm-kernel@...ts.infradead.org>; "netdev"<netdev@...r.kernel.org>; "linux-kernel"<linux-kernel@...r.kernel.org>; "杜雪盈"<21210240012@...udan.edu.cn>; Subject:  Re: [BUG] Possible Use-After-Free Vulnerability in ether3 Driver Due to Race Condition On Mon, Sep 02, 2024 at 01:19:43PM +0800, Wentai Deng wrote:> In the ether3_probe function, a timer is initialized with a callback function ether3_ledoff, bound to &amp;prev(dev)-&gt;timer. Once the timer is started, there is a risk of a race condition if the module or device is removed, triggering the ether3_remove function to perform cleanup. The sequence of operations that may lead to a UAF bug is as follows:> > > CPU0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; CPU1> > > &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp;ether3_ledoff> ether3_remove&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|> &nbsp; &nbsp; free_netdev(dev);&nbsp; &nbsp; &nbsp; &nbsp;|> &nbsp; &nbsp; put_device&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |> &nbsp; &nbsp; kfree(dev);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;|> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp;ether3_outw(priv(dev)-&gt;regs.config2 |= CFG2_CTRLO, REG_CONFIG2);> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp;// use devThis is unreadable.> Request for Review:> > > We would appreciate your expert insight to confirm whether this vulnerability indeed poses a risk to the system, and if the proposed fix is appropriate.Please resend without the HTML junk in the plain text part.-- *** please note that I probably will only be occasionally responsive*** for an unknown period of time due to recent eye surgery making*** reading quite difficult.RMK's Patch system: https://www.armlinux.org.uk/developer/patches/FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!