Re: Some highmem pages still in use after shrink_all_memory()?

[Chris Friesen]

Arjan van de Ven wrote:
> > Note that there are some applications for which it is a *bug* if an
> > mlocked page gets written out to magnetic media.  (gpg, for example.)
>
> mlock() does not guarantee things not hitting magnetic media, just as
> mlock() doesn't guarantee that the physical address of a page doesn't
> change.

The mlock() man page sure seems to hint that they do, by explicitly 
describing its use by high-security data processing as a way to keep the 
information from getting to disk.  There also seem to be a lot of 
references on the web about using mlock() in secure programming.

Something is not right...

Chris

--
Chris Friesen                    | MailStop: 043/33/F10
Nortel Networks                  | work: (613) 765-0557
3500 Carling Avenue              | fax:  (613) 765-2986
Nepean, ON K2H 8E9 Canada        | email: cfriesen@xxxxxxxxxxxxxxxxxx

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/