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Message-Id: <1462799403-10083-4-git-send-email-pantelis.antoniou@konsulko.com> Date: Mon, 9 May 2016 16:10:00 +0300 From: Pantelis Antoniou <pantelis.antoniou@...sulko.com> To: Rob Herring <robherring2@...il.com> Cc: Frank Rowand <frowand.list@...il.com>, Matt Porter <mporter@...sulko.com>, Koen Kooi <koen@...inion.thruhere.net>, Guenter Roeck <linux@...ck-us.net>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-api@...r.kernel.org, Pantelis Antoniou <pantelis.antoniou@...sulko.com>, Pantelis Antoniou <panto@...oniou-consulting.com> Subject: [PATCH v8 3/6] Documentation: ABI: overlays - global attributes Documentation ABI entry for overlays sysfs entries. Signed-off-by: Pantelis Antoniou <pantelis.antoniou@...sulko.com> Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- .../ABI/testing/sysfs-firmware-devicetree-overlays | 24 ++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-firmware-devicetree-overlays diff --git a/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays new file mode 100644 index 0000000..e938f44 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays @@ -0,0 +1,24 @@ +What: /sys/firmware/devicetree/overlays/ +Date: October 2015 +Contact: Pantelis Antoniou <pantelis.antoniou@...sulko.com> +Description: + This directory contains the applied device tree overlays of + the running system, as directories of the overlay id. + +What: /sys/firmware/devicetree/overlays/enable +Date: October 2015 +Contact: Pantelis Antoniou <pantelis.antoniou@...sulko.com> +Description: + The master enable switch, by default is 1, and when + set to 0 it cannot be re-enabled for security reasons. + + The discussion about this switch takes place in: + http://comments.gmane.org/gmane.linux.drivers.devicetree/101871 + + Kees Cook: + "Coming from the perspective of drawing a bright line between + kernel and the root user (which tends to start with disabling + kernel module loading), I would say that there at least needs + to be a high-level one-way "off" switch for the interface so + that systems that have this interface can choose to turn it off + during initial boot, etc." -- 1.7.12
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