lkml.org 
[lkml]   [2019]   [Dec]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: firmware: dmi-sysfs: why is the access mode of dmi sysfs entries restricted to 0400?
From
Date

在 2019/12/4 17:29, Greg Kroah-Hartman 写道:
> On Wed, Dec 04, 2019 at 05:01:06PM +0800, Guoheyi wrote:
>> 在 2019/12/4 15:41, Greg Kroah-Hartman 写道:
>>> On Wed, Dec 04, 2019 at 03:31:22PM +0800, Guoheyi wrote:
>>>> Hi,
>>>>
>>>> Why is the access mode of dmi sysfs entries restricted to 0400? Is it for
>>>> security concern? If it is, which information do we consider as privacy?
>>> There's lots of "interesting" information in dmi entries that you
>>> probably do not want all processes reading, which is why they are
>>> restricted.
>>>
>>>> We would like to fetch CPU information from non-root application, is there
>>>> feasible way to do that?
>>> What specific CPU information is not currently exported in /proc/cpuinfo
>>> that only shows up in DMI entries that you are interested in?
>> We'd like to get processor manufacturer, speed and version, and pass the
>> information to qemu virtual machine, for users of VM might be happy to see
>> this instead of "unknown xxx", while qemu may run as non-root.
> Careful about this as if you move that virtual machine around, those
> values will change and if userspace was depending on them being static
> (set up at program start time), then you might have problems.
>
> good luck!

The information will be used as VM DMI/SMBIOS as well, so it will be
read only once during VM boot. I guess we will be OK :)

Thanks a lot.

Heyi

>
> greg k-h
>
> .

\
 
 \ /
  Last update: 2019-12-06 03:05    [W:0.036 / U:0.408 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site