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Date:	Fri, 20 May 2016 22:30:30 -0400
From:	Javier Martinez Canillas <>
To:	Krzysztof Kozlowski <>,
	Sylwester Nawrocki <>,
	Tomasz Figa <>,
	Michael Turquette <>,
	Stephen Boyd <>,
	Kukjin Kim <>,,,,
Cc:	Bartlomiej Zolnierkiewicz <>,
	Marek Szyprowski <>
Subject: Re: [PATCH] clk: samsung: Suppress unbinding to prevent theoretical

Hello Krzysztof,

On 05/17/2016 03:26 AM, Krzysztof Kozlowski wrote:
> Although unbinding a driver requires root privileges but it still might
> be used theoretically in certain attacks (by triggering NULL pointer
> exception or memory corruption if driver does not provide proper remove
> callbacks or core does not handle it).
> Samsung clock drivers are essential for system operation so their
> removal is not expected. More over, the Exynos3250 ISP clock driver does
> not implement remove() driver callback and it is not buildable as
> modules.
> Suppress the unbind interface for Exynos3250 ISP and S3C2410 DCLK clock
> drivers.
> Suggested-by: Marek Szyprowski <>
> Cc: Marek Szyprowski <>
> Signed-off-by: Krzysztof Kozlowski <>
> ---

Reviewed-by: Javier Martinez Canillas <>

Best regards,
Javier Martinez Canillas
Open Source Group
Samsung Research America

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