From 9049572fb145746725b198a19e27fa2671b80448 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Tue, 20 Apr 2021 04:08:30 -0700 Subject: hwmon: Remove amd_energy driver Commit 60268b0e8258 ("hwmon: (amd_energy) modify the visibility of the counters") restricted visibility of AMD energy counters to work around a side-channel attack using energy data to determine which instructions are executed. The attack is described in 'PLATYPUS: Software-based Power Side-Channel Attacks on x86'. It relies on quick and accurate energy readings. This change made the counters provided by the amd_energy driver effectively unusable for non-provileged users. However, unprivileged read access is the whole point of hardware monitoring attributes. An attempt to remedy the situation by limiting and randomizing access to chip registers was rejected by AMD. Since the driver is for all practical purposes unusable, remove it. Cc: Naveen Krishna Chatradhi Cc: Greg Kroah-Hartman Acked-by: Greg Kroah-Hartman Signed-off-by: Guenter Roeck --- Documentation/hwmon/index.rst | 1 - 1 file changed, 1 deletion(-) (limited to 'Documentation/hwmon/index.rst') diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 6bc696fa0ed5..9ed60fa84cbe 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -39,7 +39,6 @@ Hardware Monitoring Kernel Drivers adt7475 aht10 amc6821 - amd_energy asb100 asc7621 aspeed-pwm-tacho -- cgit v1.2.3