linux-kernel - Re: [PATCH v2 3/4] PM / Hibernate: fix SANITIZE_FREED

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Message-ID: <28072506.ijDyy3q5rs@vostro.rjw.lan>
Date:	Tue, 05 May 2015 00:29:10 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	pageexec@...email.hu
Cc:	Anisse Astier <anisse@...ier.eu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	David Rientjes <rientjes@...gle.com>,
	Alan Cox <gnomes@...rguk.ukuu.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Brad Spengler <spender@...ecurity.net>,
	Kees Cook <keescook@...omium.org>,
	Andi Kleen <andi@...stfloor.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] PM / Hibernate: fix SANITIZE_FREED_PAGES

On Monday, May 04, 2015 11:50:13 PM PaX Team wrote:
> On 4 May 2015 at 23:16, Anisse Astier wrote:
> 
> > SANITIZE_FREED_PAGES feature relies on having all pages going through
> > the free_pages_prepare path in order to be cleared before being used. In
> > the hibernate use case, pages will automagically appear in the system
> > without being cleared.
> 
> is this based on debugging/code reading/discussions with hibernation folks
> (i see none of them on CC, added them now) or is it just a brute force attempt
> to fix the symptoms? if the former, it'd be nice to share some more details
> and have Acks from the code owners.

I haven't seen it, for one, and I'm wondering why the "clearing" cannot be done
at the swsusp_free() time?

In any case, please CC hibernation-related patches and discussions thereof to
linux-pm@...r.kernel.org.

Thanks!

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