Re: [PATCH] powerpc/papr_scm: Make access mode of 'perf_stats' attribute file to '0400'

Vaibhav Jain [off-list ref] writes:

The newly introduced 'perf_stats' attribute uses the default access
mode of 0444 letting non-root users access performance stats of an
nvdimm and potentially force the kernel into issuing large number of
expensive HCALLs. Since the information exposed by this attribute
cannot be cached hence its better to ward of access to this attribute
from non-root users.

Hence this patch updates the access-mode of 'perf_stats' sysfs
attribute file to 0400 to make it only readable to root-users.

Or should we ratelimit it?

Fixes: ??

Reported-by: Aneesh Kumar K.V <redacted>
Signed-off-by: Vaibhav Jain <redacted>

cheers