On 08/15, Kees Cook wrote:
>
> v2: update with newly added traceme report.
...
> @@ -319,12 +316,9 @@ static int yama_ptrace_traceme(struct task_struct
> *parent)
> }
>
> if (rc) {
> - char name[sizeof(current->comm)];
> printk_ratelimited(KERN_NOTICE
> "ptraceme of pid %d was attempted by: %s (pid %d)\n",
> - current->pid,
> - get_task_comm(name, parent),
> - parent->pid);
> + current->pid, parent->comm, parent->pid);
Hmm, yes. This change is even more important. This is called under
write_lock_irq(tasklist_lock), task_lock() can deadlock if we race
with another CPU doing task_lock()->interrupt->read_lock(tasklist).
Oleg.
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