Re: [kernel-hardening] Re: [PATCH] proc: restrict access to /proc/interrupts

["H. Peter Anvin" <hpa@zytor.com>]

On 11/07/2011 11:48 AM, Eric Paris wrote:
> On Mon, Nov 7, 2011 at 2:29 PM, Vasiliy Kulikov <segoon@openwall.com> wrote:
>> On Mon, Nov 07, 2011 at 11:18 -0800, H. Peter Anvin wrote:
> 
>> As to procfs, I see no real need of adding mode/group mount option for
>> global procfs files (/proc/interrupts, /proc/stat, etc.) - it can be
>> done by distro specific init scripts (chown+chmod).  I don't mind
>> against such an option for the convenience, though.
> 
> While possible, the chmod+chown 'solutions' just aren't as simple as
> you pretend.  Every time one creates a chroot environment and mounts
> /proc it has be manually fixed there as well.  Same thing with a
> container.  Sure if /proc were something that was only ever mounted
> one time on a box it wouldn't be so bad, but that's not the case.....

Yes, for a filesystem that dynamically creates nodes, a static script
just doesn't work well.  Control options do, like we have for devpts for
example.

	-hpa