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Date: Mon, 23 Aug 2010 12:54:09 -0700 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Peter Zijlstra <peterz@...radead.org> CC: Linus Torvalds <torvalds@...ux-foundation.org>, Ian Jackson <ijackson@...ark.greenend.org.uk>, Greg KH <gregkh@...e.de>, Ian Campbell <ijc@...lion.org.uk>, linux-kernel@...r.kernel.org, stable@...nel.org, stable-review@...nel.org, akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk Subject: Re: [RFC] mlock/stack guard interaction fixup On 08/23/2010 12:26 PM, Peter Zijlstra wrote: > On Mon, 2010-08-23 at 12:23 -0700, Jeremy Fitzhardinge wrote: >> On 08/23/2010 12:07 PM, Peter Zijlstra wrote: >>> mlock() simply avoids major faults, nothing more. >>> >>> I think both page migration and page-out for shared pages where some >>> maps are !mlocked can cause unmaps and thus minor faults. >>> >>> mlock and dirty do not interact, they will still be cleaned/written out >>> as normal. >> So mlock is useless for preventing secret stuff from being written to disk. > Well, if you put your sekrit in a file map, sure. > > Use a mmap(MAP_ANONYMOUS|MAP_LOCK) and madvise(MADV_DONTFORK) for your > sekrits. Won't dirty anonymous pages also get written to swap? J -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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