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powercap: restrict energy meter to root access
commit949dd0104c
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:95677a9a38
("PowerCap: Fix mode for energy counter") Signed-off-by: Len Brown <len.brown@intel.com> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 2 additions and 2 deletions
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@ -367,9 +367,9 @@ static void create_power_zone_common_attributes(
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&dev_attr_max_energy_range_uj.attr;
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if (power_zone->ops->get_energy_uj) {
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if (power_zone->ops->reset_energy_uj)
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dev_attr_energy_uj.attr.mode = S_IWUSR | S_IRUGO;
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dev_attr_energy_uj.attr.mode = S_IWUSR | S_IRUSR;
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else
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dev_attr_energy_uj.attr.mode = S_IRUGO;
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dev_attr_energy_uj.attr.mode = S_IRUSR;
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power_zone->zone_dev_attrs[count++] =
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&dev_attr_energy_uj.attr;
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}
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