* override a task's own credentials so that work can be done on behalf of that
* task that requires a different subjective context.
*
- * @daemon is used to provide a base for the security record, but can be NULL.
- * If @daemon is supplied, then the security data will be derived from that;
- * otherwise they'll be set to 0 and no groups, full capabilities and no keys.
+ * @daemon is used to provide a base cred, with the security data derived from
+ * that; if this is "&init_task", they'll be set to 0, no groups, full
+ * capabilities, and no keys.
*
* The caller may change these controls afterwards if desired.
*
const struct cred *old;
struct cred *new;
+ if (WARN_ON_ONCE(!daemon))
+ return NULL;
+
new = kmem_cache_alloc(cred_jar, GFP_KERNEL);
if (!new)
return NULL;
kdebug("prepare_kernel_cred() alloc %p", new);
- if (daemon)
- old = get_task_cred(daemon);
- else
- old = get_cred(&init_cred);
-
+ old = get_task_cred(daemon);
validate_creds(old);
*new = *old;