Re: [PATCH] spi: expose spi_master and spi_device statistics via sysfs

[Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>]

On 05/25/2015 07:28 PM, kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org wrote:
> From: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
>
> per spi-master statistics accessible as:
>    /sys/class/spi_master/spi*/statistics/
>
> per spi-device statistics accessible via:
>    /sys/class/spi_master/spi*/spi*.*/statistics/
>
> The following statistics are exposed as separate "files" inside
> these directories:
>    * messages		number of spi_messages
>    * transfers		number of spi_transfers
>    * bytes		number of bytes transferred
>    * bytes_rx		number of bytes transmitted
>    * bytes_tx		number of bytes received
>    * bytes_histo		transferred bytes/spi_transfer histogram

Having those kinds of stats in world readable files has serious security 
implications as they can be used to implement side-channel attacks. They 
should probably only be available in debugfs for root.
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