kernel: Use real_parent to avoid interference from ptrace.

tiann · tiann · commit 5c48b93524e4 · 2025-11-08T08:37:14.000Z
diff --git a/kernel/ksud.c b/kernel/ksud.c
@@ -273,7 +273,7 @@ int ksu_handle_execveat_ksud(int *fd, struct filename **filename_ptr,
                 init_second_stage_executed);
         struct task_struct *init_task;
         rcu_read_lock();
-        init_task = rcu_dereference(current->parent);
+        init_task = rcu_dereference(current->real_parent);
         if (init_task) {
             task_work_add(init_task, &on_post_fs_data_cb, TWA_RESUME);
         }

Original file line number	Diff line number	Diff line change
`@@ -273,7 +273,7 @@ int ksu_handle_execveat_ksud(int fd, struct filename *filename_ptr,`
`273`	`273`	`init_second_stage_executed);`
`274`	`274`	`struct task_struct *init_task;`
`275`	`275`	`rcu_read_lock();`
`276`		`- init_task = rcu_dereference(current->parent);`
	`276`	`+ init_task = rcu_dereference(current->real_parent);`
`277`	`277`	`if (init_task) {`
`278`	`278`	`task_work_add(init_task, &on_post_fs_data_cb, TWA_RESUME);`
`279`	`279`	`}`