Re: [PATCH v3 2.6.39-rc1-tip 12/26] 12: uprobes: slot allocationfor uprobes

[Roland McGrath]

> Unrelated note: I'd prefer to see that page be READ+EXEC only once it
> has been mapped into the victim task.  Obviously the portion of the code
> that creates this page and sets up the instructions to run is going to
> need write.  Maybe this isn't feasible.  Maybe this magic pages gets
> written a lot even after it's been mapped in.  But I'd rather, if
> possible, know that my victim tasks didn't have a WRITE+EXEC page
> available......

AIUI the page never really needs to be writable in the page tables.  It's
never written from user mode.  It's only written by kernel code, and that
can use a separate momentary kmap to do its writing.


Thanks,
Roland
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