lkml.org 
[lkml]   [2015]   [Sep]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v4 4/7] fs: Limit file caps to the user namespace of the super block
On Thu, Sep 24, 2015 at 04:59:35PM -0500, Eric W. Biederman wrote:
> Seth Forshee <seth.forshee@canonical.com> writes:
>
> > Capability sets attached to files must be ignored except in the
> > user namespaces where the mounter is privileged, i.e. s_user_ns
> > and its descendants. Otherwise a vector exists for gaining
> > privileges in namespaces where a user is not already privileged.
> >
> > Add a new helper function, in_user_ns(), to test whether a user
> > namespace is the same as or a descendant of another namespace.
> > Use this helper to determine whether a file's capability set
> > should be applied to the caps constructed during exec.
>
> No issues with this but given that we always pass current_user_ns()
> we may want to simplify the users of in_user_ns by renaming it
> current_in_user_ns() and hard codeing current_user_ns().

Sure, if that's what you prefer then I'll change it.

Seth


\
 
 \ /
  Last update: 2015-09-25 15:21    [W:0.317 / U:0.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site