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Commit 04533793 authored by Len Brown's avatar Len Brown Committed by Greg Kroah-Hartman
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powercap: restrict energy meter to root access


commit 949dd010 upstream.

Remove non-privileged user access to power data contained in
/sys/class/powercap/intel-rapl*/*/energy_uj

Non-privileged users currently have read access to power data and can
use this data to form a security attack. Some privileged
drivers/applications need read access to this data, but don't expose it
to non-privileged users.

For example, thermald uses this data to ensure that power management
works correctly. Thus removing non-privileged access is preferred over
completely disabling this power reporting capability with
CONFIG_INTEL_RAPL=n.

Fixes: 95677a9a ("PowerCap: Fix mode for energy counter")
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 206734ea
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