lsm: separate security_task_getsecid() into subjective and objective variants

Of the three LSMs that implement the security_task_getsecid() LSM
hook, all three LSMs provide the task's objective security
credentials.  This turns out to be unfortunate as most of the hook's
callers seem to expect the task's subjective credentials, although
a small handful of callers do correctly expect the objective
credentials.

This patch is the first step towards fixing the problem: it splits
the existing security_task_getsecid() hook into two variants, one
for the subjective creds, one for the objective creds.

  void security_task_getsecid_subj(struct task_struct *p,
				   u32 *secid);
  void security_task_getsecid_obj(struct task_struct *p,
				  u32 *secid);

While this patch does fix all of the callers to use the correct
variant, in order to keep this patch focused on the callers and to
ease review, the LSMs continue to use the same implementation for
both hooks.  The net effect is that this patch should not change
the behavior of the kernel in any way, it will be up to the latter
LSM specific patches in this series to change the hook
implementations and return the correct credentials.

Acked-by: Mimi Zohar <zohar@linux.ibm.com> (IMA)
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 97bb36d7e994..ba2ccd950833 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -713,9 +713,15 @@
  *	@p.
  *	@p contains the task_struct for the process.
  *	Return 0 if permission is granted.
- * @task_getsecid:
- *	Retrieve the security identifier of the process @p.
- *	@p contains the task_struct for the process and place is into @secid.
+ * @task_getsecid_subj:
+ *	Retrieve the subjective security identifier of the task_struct in @p
+ *	and return it in @secid.  Special care must be taken to ensure that @p
+ *	is the either the "current" task, or the caller has exclusive access
+ *	to @p.
+ *	In case of failure, @secid will be set to zero.
+ * @task_getsecid_obj:
+ *	Retrieve the objective security identifier of the task_struct in @p
+ *	and return it in @secid.
  *	In case of failure, @secid will be set to zero.
  *
  * @task_setnice: