[PATCH v8 2/3] Teach SELinux about anonymous inodes

[Lokesh Gidra]

On Mon, Aug 31, 2020 at 11:05 AM Stephen Smalley
<stephen.smalley.work at gmail.com> wrote:
>
> On Thu, Aug 27, 2020 at 2:35 AM Lokesh Gidra <lokeshgidra at google.com> wrote:
> >
> > From: Daniel Colascione <dancol at google.com>
> >
> > This change uses the anon_inodes and LSM infrastructure introduced in
> > the previous patch to give SELinux the ability to control
> > anonymous-inode files that are created using the new anon_inode_getfd_secure()
> > function.
> >
> > A SELinux policy author detects and controls these anonymous inodes by
> > adding a name-based type_transition rule that assigns a new security
> > type to anonymous-inode files created in some domain. The name used
> > for the name-based transition is the name associated with the
> > anonymous inode for file listings --- e.g., "[userfaultfd]" or
> > "[perf_event]".
> >
> > Example:
> >
> > type uffd_t;
> > type_transition sysadm_t sysadm_t : anon_inode uffd_t "[userfaultfd]";
> > allow sysadm_t uffd_t:anon_inode { create };
> >
> > (The next patch in this series is necessary for making userfaultfd
> > support this new interface.  The example above is just
> > for exposition.)
> >
> > Signed-off-by: Daniel Colascione <dancol at google.com>
> > Acked-by: Casey Schaufler <casey at schaufler-ca.com>
> > Acked-by: Stephen Smalley <stephen.smalley.work at gmail.com>
> > Cc: Al Viro <viro at zeniv.linux.org.uk>
> > Cc: Andrew Morton <akpm at linux-foundation.org>
> > ---
> >  security/selinux/hooks.c            | 53 +++++++++++++++++++++++++++++
> >  security/selinux/include/classmap.h |  2 ++
> >  2 files changed, 55 insertions(+)
> >
> > diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> > index a340986aa92e..b83f56e5ef40 100644
> > --- a/security/selinux/hooks.c
> > +++ b/security/selinux/hooks.c
> > @@ -2926,6 +2926,58 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
> >         return 0;
> >  }
> >
> > +static int selinux_inode_init_security_anon(struct inode *inode,
> > +                                           const struct qstr *name,
> > +                                           const struct inode *context_inode)
> > +{
> > +       const struct task_security_struct *tsec = selinux_cred(current_cred());
> > +       struct common_audit_data ad;
> > +       struct inode_security_struct *isec;
> > +       int rc;
> > +
> > +       if (unlikely(!selinux_state.initialized))
>
> This should use selinux_initialized(&selinux_state) instead.

Thanks for the review. I'll make the change in the next version.

Kindly have a look at other patches in the series as well.