I am sure I missed the problem, but...

On 05/02, Kirill A. Shutemov wrote:

Quick look around:

 - I don't see any check page_count() around __replace_page() in uprobes,
   so it can easily replace pinned page.

Why it should? even if it races with get_user_pages_fast()... this doesn't
differ from the case when an application writes to MAP_PRIVATE non-anonymous
region, no?

Oleg.

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