[2.6.22.2 review 36/84] CPU online file permission

[Greg KH]

From: Ulrich Drepper <drepper@xxxxxxxxxx>

Is there a reason why the "online" file in the subdirectories for the CPUs
in /sys/devices/system isn't world-readable?  I cannot imagine it to be
security relevant especially now that a getcpu() syscall can be used to
determine what CPUa thread runs on.

The file is useful to correctly implement the sysconf() function to return
the number of online CPUs.  In the presence of hotplug we currently cannot
provide this information.  The patch below should to it.

Signed-off-by: Ulrich Drepper <drepper@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/base/cpu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -53,7 +53,7 @@ static ssize_t store_online(struct sys_d
 		ret = count;
 	return ret;
 }
-static SYSDEV_ATTR(online, 0600, show_online, store_online);
+static SYSDEV_ATTR(online, 0644, show_online, store_online);
 
 static void __devinit register_cpu_control(struct cpu *cpu)
 {

-- 
-
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