Re: [PATCH] mm, soft offline: split thp at the beginning of soft_offline_page()

[Andi Kleen]

Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> writes:

> When we try to soft-offline a thp tail page, put_page() is called on the
> tail page unthinkingly and VM_BUG_ON is triggered in put_compound_page().
> This patch splits thp before going into the main body of soft-offlining.

Looks good.

>
> The interface of soft-offlining is open for userspace, so this bug can
> lead to DoS attack and should be fixed immedately.

The interface is root only and root can do everything anyways, so it's
not really a security issue.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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