[PATCH]: make /dev/cpu/<n>/cpuid world readable

[Andre Przywara <andre.przywara@amd.com>]

Hi,

as I don't see any security implications, to be actually useful 
/dev/cpu/<n>/cpuid should be world readable. The cpuid instruction can 
be called from userspace anyway, so there is nothing to hide.
The device does not support any write operation, so 0444 should suffice.
Please apply so that distributions can follow.

Regards,
Andre.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>

diff --git a/rules/rules.d/50-udev-default.rules b/rules/rules.d/50-udev-default.rules
index 240cb3b..72e5b55 100644
--- a/rules/rules.d/50-udev-default.rules
+++ b/rules/rules.d/50-udev-default.rules
@@ -95,7 +95,7 @@ SUBSYSTEM="aoe", KERNEL="err", MODE="0440"
 KERNEL="tun",                 NAME="net/%k", MODE="0666"

 # CPU
-KERNEL="cpu[0-9]*",           NAME="cpu/%n/cpuid"
+KERNEL="cpu[0-9]*",           NAME="cpu/%n/cpuid", MODE="0444"
 KERNEL="msr[0-9]*",           NAME="cpu/%n/msr"
 KERNEL="microcode",           NAME="cpu/microcode", MODE="0600"

--
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 488-3567-12
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