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

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Message-ID: <20150512090156.24768.2521.stgit@buzz>
Date:	Tue, 12 May 2015 12:43:02 +0300
From:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:	linux-mm@...ck.org, Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mark Williamson <mwilliamson@...o-software.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	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: [PATCH RFC 0/3] pagemap: make useable for non-privilege users

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(-)
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