A while back, a bunch of android devices (mainly cheap ones, low end Huaweis etc) had world readable frame buffers. Meant that an unprivileged app could read an

A while back, a bunch of android devices (mainly cheap ones, low end Huaweis etc) had world readable frame buffers. Meant that an unprivileged app could read and process /dev/fb0 and snoop on the display. Same was sometimes true for /dev/input/eventN —- allowed touch screen to be read from and written to.