Re: yama_ptrace_access_check(): possible recursive locking detected

[Oleg Nesterov]

On 07/26, Fengguang Wu wrote:
>
> Here is a recursive lock possibility:
>
>         ptrace_may_access()
> =>        task_lock(task);
>             yama_ptrace_access_check()
>               get_task_comm()
> =>              task_lock(task);

I think yama_ptrace_access_check() can simply use ->comm

Oleg.

--- x/security/yama/yama_lsm.c
+++ x/security/yama/yama_lsm.c
@@ -279,12 +279,9 @@ static int yama_ptrace_access_check(stru
        }
 
        if (rc) {
-               char name[sizeof(current->comm)];
                printk_ratelimited(KERN_NOTICE
                        "ptrace of pid %d was attempted by: %s (pid %d)\n",
-                       child->pid,
-                       get_task_comm(name, current),
-                       current->pid);
+                       child->pid, current->comm, current->pid);
        }
 
        return rc;

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