Re: Change in functionality of futex() system call.

[Eric Dumazet]

Le lundi 06 juin 2011 Ã 18:16 +0200, Peter Zijlstra a Ãcrit :

> Hmm, wouldn't that still be susceptible to the zero-page thing if: we
> create a writable private file map of a sparse file, touch a page and
> then remap the thing RO?
> 
> 
> 

Also I am not sure how MAP_PRIVATE could be affected. If we still try a
RW gup()... It will allocate a page for us, instead of still pointing to
shared one.

On previous kernel, the application using read-only mapping could use
MAP_PRIVATE or MAP_SHARED with same 'behavior'


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