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-rw-r--r--include/linux/cred.h15
1 files changed, 10 insertions, 5 deletions
diff --git a/include/linux/cred.h b/include/linux/cred.h
index ce40cbc791e..4d2c39573f3 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -274,13 +274,18 @@ static inline void put_cred(const struct cred *_cred)
274 * @task: The task to query 274 * @task: The task to query
275 * 275 *
276 * Access the objective credentials of a task. The caller must hold the RCU 276 * Access the objective credentials of a task. The caller must hold the RCU
277 * readlock. 277 * readlock or the task must be dead and unable to change its own credentials.
278 * 278 *
279 * The caller must make sure task doesn't go away, either by holding a ref on 279 * The result of this function should not be passed directly to get_cred();
280 * task or by holding tasklist_lock to prevent it from being unlinked. 280 * rather get_task_cred() should be used instead.
281 */ 281 */
282#define __task_cred(task) \ 282#define __task_cred(task) \
283 ((const struct cred *)(rcu_dereference_check((task)->real_cred, rcu_read_lock_held() || lockdep_tasklist_lock_is_held()))) 283 ({ \
284 const struct task_struct *__t = (task); \
285 rcu_dereference_check(__t->real_cred, \
286 rcu_read_lock_held() || \
287 task_is_dead(__t)); \
288 })
284 289
285/** 290/**
286 * get_current_cred - Get the current task's subjective credentials 291 * get_current_cred - Get the current task's subjective credentials