Re: [kernel-hardening] [RFC 2/5 v4] procfs: add hidepid= and gid= mount options

[Vasiliy Kulikov <segoon@openwall.com>]

On Mon, Jun 20, 2011 at 18:11 +0400, Solar Designer wrote:
> Vasiliy -
> 
> On Mon, Jun 20, 2011 at 04:58:10PM +0300, Alexey Dobriyan wrote:
> > gid= is bad choice because
> > a) e. g. VFAT uses uid=/gid= mount options to make all inodes to have
> > certain uid/gid
> > b) uid=/gid=, IIRC, will be added as generic VFS mount options (like ro)
> >    with semantics described in a)
> > 
> > so having different semantics for /proc won't be good.
> 
> I lost track of your proposals/patches.  Aren't you currently proposing
> that gid= would make all inodes have the specified gid?  If not, why
> not?  Such semantics sound fine to me.  That's what gid= does on procfs
> on Linux 2.4.x-ow.

With taskstats and similar mechanisms IMO it's better to use sysctls
instead of procfs mount options as it would influence not only on procfs
files.

Thanks,

-- 
Vasiliy