linux-kernel - Re: [PATCH] spmi: mediatek: Fix UAF on device remove

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Date:   Tue, 18 Jul 2023 14:57:44 +0800
From:   Fei Shao <fshao@...omium.org>
To:     Yu-Che Cheng <giver@...omium.org>
Cc:     James Lo <james.lo@...iatek.com>, Stephen Boyd <sboyd@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] spmi: mediatek: Fix UAF on device remove

On Mon, Jul 17, 2023 at 5:41 PM Yu-Che Cheng <giver@...omium.org> wrote:
>
> The pmif driver data that contains the clocks is allocated along with
> spmi_controller.
> On device remove, spmi_controller will be freed first, and then devres
> , including the clocks, will be cleanup.
> This leads to UAF because putting the clocks will access the clocks in
> the pmif driver data, which is already freed along with spmi_controller.
>
> This can be reproduced by enabling DEBUG_TEST_DRIVER_REMOVE and
> building the kernel with KASAN.
>
> Fix the UAF issue by using unmanaged clk_bulk_get() and putting the
> clocks before freeing spmi_controller.
>
> Reported-by: Fei Shao <fshao@...omium.org>
> Signed-off-by: Yu-Che Cheng <giver@...omium.org>

Reviewed-by: Fei Shao <fshao@...omium.org>
Tested-by: Fei Shao <fshao@...omium.org>