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The Pulse-Eight HDMI-CEC adapter by default appears as /dev/ttyACM0, owned by the "dialout" user with 660 permissions. However this device is used as an input device so it makes more sense to be owned by the "input" group. This also allows any user part of that group to use the device without having to be part of the dialout group, which is useful for at least Plasma Bigscreen and probably also for Kodi
45 lines
1.9 KiB
Diff
45 lines
1.9 KiB
Diff
From a3e9213b5e3ae2572390435e4b718fd7f3f49617 Mon Sep 17 00:00:00 2001
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From: Bart Ribbers <bribbers@disroot.org>
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Date: Thu, 23 Dec 2021 12:25:25 +0100
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Subject: [PATCH] Add an udev rule making the CEC adapter part of the input
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group
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Without this, the HDMI CEC USB adapter appears as /dev/ttyACM0 owned by
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the dialout group with mode 660. This means that any user that wants to
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use this device needs to be part of the dialout group. This actually has
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security concerns as all serial devices are owned by that group as well
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and it would give the user too much control of them, meaning any rogue
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process can cause harm without needing root access.
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Since the CEC adapter is actually used as an input device, this udev
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rule makes the device be part of the input group instead. This makes
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sense as it _is_ an input device and any rogue process shouldn't be able
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to do to much harm with that group. On most distributions the standard
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user is part of that group by default anyway
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---
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CMakeLists.txt | 4 ++++
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udev/90-hdmi-cec.rules | 2 ++
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2 files changed, 6 insertions(+)
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create mode 100644 udev/90-hdmi-cec.rules
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diff --git a/CMakeLists.txt b/CMakeLists.txt
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index abd42db2..42c8a52e 100644
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--- a/CMakeLists.txt
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+++ b/CMakeLists.txt
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@@ -44,3 +44,7 @@ if(WIN32)
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configure_file(${CMAKE_CURRENT_SOURCE_DIR}/src/dotnet/src/CecSharpTester/netfx/Properties/AssemblyInfo.cs.in
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${CMAKE_CURRENT_SOURCE_DIR}/src/dotnet/src/CecSharpTester/netfx/Properties/AssemblyInfo.cs)
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endif()
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+
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+if(UNIX AND NOT APPLE)
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+ install(FILES udev/90-hdmi-cec.rules DESTINATION ${CMAKE_INSTALL_LIBDIR}/udev/rules.d)
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+endif()
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diff --git a/udev/90-hdmi-cec.rules b/udev/90-hdmi-cec.rules
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new file mode 100644
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index 00000000..08cb14a1
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--- /dev/null
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+++ b/udev/90-hdmi-cec.rules
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@@ -0,0 +1,2 @@
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+# Pulse-Eight CEC adapter
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+KERNEL=="ttyACM[0-9]*", SUBSYSTEM=="tty", ATTRS{idVendor}=="2548", ATTRS{idProduct}=="1002", GROUP="input"
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