linux-kernel - [PATCHSET v4 0/5] pagemap: make useable for non-privilege users

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Date:	Tue, 14 Jul 2015 18:37:34 +0300
From:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>,
	Mark Williamson <mwilliamson@...o-software.com>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Subject: [PATCHSET v4 0/5] pagemap: make useable for non-privilege users

This patchset makes pagemap useable again in the safe way (after row hammer
bug it was made CAP_SYS_ADMIN-only). This patchset restores access for
non-privileged users but hides PFNs from them.

Also it adds bit 'map-exlusive' which is set if page is mapped only here:
it helps in estimation of working set without exposing pfns and allows to
distinguish CoWed and non-CoWed private anonymous pages.

Second 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.

Changes since v3:
* patches reordered: cleanup now in second patch
* update pagemap for hugetlb, add missing 'FILE' bit
* fix PM_PFRAME_BITS: its 55 not 54 as was in previous versions

---

Konstantin Khlebnikov (5):
      pagemap: check permissions and capabilities at open time
      pagemap: switch to the new format and do some cleanup
      pagemap: rework hugetlb and thp report
      pagemap: hide physical addresses from non-privileged users
      pagemap: add mmap-exclusive bit for marking pages mapped only here


 Documentation/vm/pagemap.txt |    3 
 fs/proc/task_mmu.c           |  267 ++++++++++++++++++------------------------
 tools/vm/page-types.c        |   35 +++---
 3 files changed, 137 insertions(+), 168 deletions(-)

--
Konstantin
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