linux-kernel - Re: [PATCH v3 04/10] iio: at91-sama5d2

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Message-ID: <2d150d6d-17bb-3e18-3174-e769f4cc8417@microchip.com>
Date:   Thu, 6 Oct 2022 08:34:17 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <mazziesaccount@...il.com>, <matti.vaittinen@...rohmeurope.com>
CC:     <Eugen.Hristev@...rochip.com>, <jic23@...nel.org>,
        <lars@...afoo.de>, <Nicolas.Ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <alexandru.ardelean@...log.com>,
        <linux-iio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 04/10] iio: at91-sama5d2_adc: Fix unsafe buffer
 attributes

On 03.10.2022 11:11, Matti Vaittinen wrote:
> The iio_triggered_buffer_setup_ext() was changed by
> commit 15097c7a1adc ("iio: buffer: wrap all buffer attributes into iio_dev_attr")
> to silently expect that all attributes given in buffer_attrs array are
> device-attributes. This expectation was not forced by the API - and some
> drivers did register attributes created by IIO_CONST_ATTR().
> 
> The added attribute "wrapping" does not copy the pointer to stored
> string constant and when the sysfs file is read the kernel will access
> to invalid location.
> 
> Change the IIO_CONST_ATTRs from the driver to IIO_DEVICE_ATTR in order
> to prevent the invalid memory access.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
> Fixes: 15097c7a1adc ("iio: buffer: wrap all buffer attributes into iio_dev_attr")

Tested-by: Claudiu Beznea <claudiu.beznea@...rochip.com>

on SAMA5D2