Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753349AbbGNPji (ORCPT ); Tue, 14 Jul 2015 11:39:38 -0400 Received: from forward-corp1g.mail.yandex.net ([95.108.253.251]:50225 "EHLO forward-corp1g.mail.yandex.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752247AbbGNPhi (ORCPT ); Tue, 14 Jul 2015 11:37:38 -0400 Authentication-Results: smtpcorp4.mail.yandex.net; dkim=pass header.i=@yandex-team.ru Subject: [PATCHSET v4 0/5] pagemap: make useable for non-privilege users From: Konstantin Khlebnikov To: linux-mm@kvack.org, Andrew Morton , Naoya Horiguchi Cc: "Kirill A. Shutemov" , Mark Williamson , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org Date: Tue, 14 Jul 2015 18:37:34 +0300 Message-ID: <20150714152516.29844.69929.stgit@buzz> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1564 Lines: 39 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/