linux-kernel - Re: [PATCH] clk: bcm: rpi: Fix an out-of-bound access to raspberrypi_clk

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Message-ID: <64aedb51-b0b4-d412-b5ad-67d50f12ad8b@huaweicloud.com>
Date:   Sun, 9 Oct 2022 11:34:22 +0800
From:   Xu Kuohai <xukuohai@...weicloud.com>
To:     Stefan Wahren <stefan.wahren@...e.com>,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Maxime Ripard <maxime@...no.tech>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Xu Kuohai <xukuohai@...wei.com>
Subject: Re: [PATCH] clk: bcm: rpi: Fix an out-of-bound access to
 raspberrypi_clk_variants

On 10/9/2022 1:07 AM, Stefan Wahren wrote:
> Hi Xu,
> 
> Am 08.10.22 um 16:45 schrieb Xu Kuohai:
>> From: Xu Kuohai <xukuohai@...wei.com>
>>
>> KASAN reports an out-of-bound access to raspberrypi_clk_variants[]:
>>
>> ==================================================================
>> BUG: KASAN: global-out-of-bounds in raspberrypi_clk_probe+0x1dc/0x690
>> Read of size 1 at addr ffffcc7116d615a0 by task kworker/u8:0/8
>>
>> CPU: 1 PID: 8 Comm: kworker/u8:0 Not tainted 6.0.0-rc3-00900-g08f4df4a3c53 raspberrypi#10
> 
> this kernel is a little bit older and doesn't contain bc163555603e ("clk: bcm: rpi: Prevent out-of-bounds access").
> 
> Can you please check Linux 6.0?
> 

Yes, the kernel branch I used was not updated, and the KASAN warning was gone after switching to 6.0 kernel, thanks.

> Best regards
>