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arm/config/revpi-*: Disable /dev/gpiomem rootless GPIO access via mmap() [REVPI-1899]

Ghost User requested to merge github/fork/iluminat23/task/REVPI-1899/gpiomem into devel/revpi-5.10

Created by: iluminat23

The CONFIG_BCM2835_DEVGPIOMEM option rovides users with root-free access to the GPIO registers on the 2835. Calling mmap(/dev/gpiomem) will map the GPIO register page to the user's pointer.

As this provides a way for unprivileged useres to change any h/w pin this is a direct threat for security and might possibly damage the hardware. To access GPIOs gpiod should be used.

Disable this option on all RevPi kernels.

Signed-off-by: Philipp Rosenberger p.rosenberger@kunbus.com

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