linux-kernel - Re: [PATCH RFC 0/3] pagemap: make useable for non-privilege users

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAEVpBa+-wwf5Q3CwQAAad3V0pJ+uD50uaHKW=EnChLDLOLSAGg@mail.gmail.com>
Date:	Tue, 12 May 2015 12:13:30 +0100
From:	Mark Williamson <mwilliamson@...o-software.com>
To:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:	linux-mm@...ck.org, Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Linux API <linux-api@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Vlastimil Babka <vbabka@...e.cz>, Pavel Machek <pavel@....cz>,
	Mark Seaborn <mseaborn@...omium.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Daniel James <djames@...o-software.com>,
	Finn Grimwood <fgrimwood@...o-software.com>
Subject: Re: [PATCH RFC 0/3] pagemap: make useable for non-privilege users

Hi Konstantin,

Thanks very much for continuing to look at this!  It's very much
appreciated.  I've been investigating from our end but got caught up
in some gnarly details of our pagemap-consuming code.

I like the approach and it seems like the information you're exposing
will be useful for our application.  I'll test the patch and see if it
works for us as-is.

Will follow up with any comments on the individual patches.

Thanks,
Mark

On Tue, May 12, 2015 at 10:43 AM, Konstantin Khlebnikov
<khlebnikov@...dex-team.ru> wrote:
> This patchset tries to make pagemap useable again in the safe way.
> First patch adds bit 'map-exlusive' which is set if page is mapped only here.
> Second patch restores access for non-privileged users but hides pfn if task
> has no capability CAP_SYS_ADMIN. Third patch removes page-shift bits and
> completes migration to the new pagemap format (flags soft-dirty and
> mmap-exlusive are available only in the new format).
>
> ---
>
> Konstantin Khlebnikov (3):
>       pagemap: add mmap-exclusive bit for marking pages mapped only here
>       pagemap: hide physical addresses from non-privileged users
>       pagemap: switch to the new format and do some cleanup
>
>
>  Documentation/vm/pagemap.txt |    3 -
>  fs/proc/task_mmu.c           |  178 +++++++++++++++++-------------------------
>  tools/vm/page-types.c        |   35 ++++----
>  3 files changed, 91 insertions(+), 125 deletions(-)
--
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/