On 2021/02/12 1:41, Michal Hocko wrote: > But I suspect we have drifted away from the original issue. I thought > that a simple check would help us narrow down this particular case and > somebody messing up from the IRQ context didn't sound like a completely > off. > From my experience at https://lkml.kernel.org/r/201409192053.IHJ35462.JLOMOSOFFVtQFH@xxxxxxxxxxxxxxxxxxx , I think we can replace direct PF_* manipulation with macros which do not receive "struct task_struct *" argument. Since TASK_PFA_TEST()/TASK_PFA_SET()/TASK_PFA_CLEAR() are for manipulating PFA_* flags on a remote thread, we can define similar ones for manipulating PF_* flags on current thread. Then, auditing dangerous users becomes easier.
