Re: [PATCH v2 0/5] Fix oom killer doesn't work at all if system have> gigabytes memory (aka CAI founded issue)

From: KOSAKI Motohiro
Date: Sun Jun 05 2011 - 23:07:23 EST

>> Of course, we recommend to drop privileges as far as possible
>> instead of keeping them. Thus, oom killer don't have to check
>> any capability. It implicitly suggest wrong programming style.
>> This patch change root process check way from CAP_SYS_ADMIN to
>> just euid==0.
> I like this but I have some comments.
> Firstly, it's not dependent with your series so I think this could
> be merged firstly.

I agree.

> Before that, I would like to make clear my concern.
> As I look below comment, 3% bonus is dependent with __vm_enough_memory's logic?

No. completely independent.

vm_enough_memory() check the task _can_ allocate more memory. IOW, the task
is subjective. And oom-killer check the task should be protected from oom-killer.
IOW, the task is objective.

> If it isn't, we can remove the comment. It would be another patch.
> If is is, could we change __vm_enough_memory for euid instead of cap?
> * Root processes get 3% bonus, just like the __vm_enough_memory()
> * implementation used by LSMs.

vm_enough_memory() is completely correct. I don't see any reason to change it.

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