On Thu, Aug 27, 2020 at 2:35 AM Lokesh Gidra <lokeshgidra@xxxxxxxxxx> wrote:
>
> From: Daniel Colascione <dancol@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
> Acked-by: Casey Schaufler <casey@xxxxxxxxxxxxxxxx>
> Acked-by: Stephen Smalley <stephen.smalley.work@xxxxxxxxx>
> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> ---
> 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.
