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authorLen Brown <len.brown@intel.com>2020-11-10 13:00:00 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-11-10 21:11:27 +0100
commit900281e167f45e0c0e5df6e59fa00334b5e38133 (patch)
treec4955ca45f46892cd43ff09d111d3b83123b0a3e /drivers/xen/preempt.c
parent53fff24aaf01dcb09cbfabbe060f42db8e61ab01 (diff)
powercap: restrict energy meter to root access
commit 949dd0104c496fa7c14991a23c03c62e44637e71 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: 95677a9a3847 ("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>
Diffstat (limited to 'drivers/xen/preempt.c')
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