From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C63BDC433E0 for ; Sun, 24 Jan 2021 18:43:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9DB4222CF6 for ; Sun, 24 Jan 2021 18:43:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726422AbhAXSmv (ORCPT ); Sun, 24 Jan 2021 13:42:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725968AbhAXSmt (ORCPT ); Sun, 24 Jan 2021 13:42:49 -0500 Received: from mail-ej1-x635.google.com (mail-ej1-x635.google.com [IPv6:2a00:1450:4864:20::635]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B71DAC061573; Sun, 24 Jan 2021 10:42:08 -0800 (PST) Received: by mail-ej1-x635.google.com with SMTP id ke15so14814897ejc.12; Sun, 24 Jan 2021 10:42:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=W+JrCBsCsPTl6k7mNOkqzbJk1+UN8xbWUBx1eSyEtDs=; b=hbw8BlgW+Ct3Bxn/x0gbkALVc1KsoL4rBhzA4mwCeM2VuWfruCw7rIktlxO/J8frZy pSLVg9lssIJlmtP+qvc+a7+aqFYyHJdoD/OIiv1nG7zFVp9ZMzEiVXqUhTXcZni1jssG zlMhNM/9bcDlAhtCAaa3RkfVtV6WdAJUQ7Z7xQjNMffrpjRzWljdWvlezYhKahSu2Sdu 7+50589H/fjgHUUHOI/knzaWnYKj3b8FYInOIX1MOQA7GO+A9kpu6a8aRL1YVeMsnHme NWxJ0lQ0UUllW0nyCTtvkd/D6+vHdOAw792V1Se2kfZBP3E8IUrWxzc4inmNxw8dyirk J1zg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=W+JrCBsCsPTl6k7mNOkqzbJk1+UN8xbWUBx1eSyEtDs=; b=s0hiJkbZSbeqsY2BFkxvCzlcrfHrnz2K5sNXtYs6CCqxEEKYbzTzAJVVpeRLKsMLoD FN/2pZOj43ak1XjNN/K0yhfGlq6s1xVY93UkIqw3Vpn+uf/S+xeDb7DFJDJAyDPhWvt/ bX7E5hmkJssDF6EoStQoSxdAcV7OK+wo1vM6t+dH1zTkzpGNEy4Pa1wezuK6/n6OU7ct 4JsNdLcvDpQVQD9EQxRkezTThztGeSEhEgDB0xu9+S67q25RBxDD/rgTows8lk59vqsl K3qiLpqjYYQgL5Wmmi6oFJ1raup10in0dBexgCo12w8ptzpqqxIaPMx+FPXOPR8K1UB+ ulxQ== X-Gm-Message-State: AOAM53319dEywdBOKa6d5pDTU6X/V7BAmNfuptO5FKzOWV3XkB51er5i +93ZNP5nPHLF18f0BHYjMKNX8cD0pos= X-Google-Smtp-Source: ABdhPJywZfVzgUMih3nNMYLdBzhLmwmHCvpx5+4UPoo6FmrqJvAdTKlTUgn9xmhEq7z1RvAlHmY3yQ== X-Received: by 2002:a17:906:6087:: with SMTP id t7mr106276ejj.90.1611513727474; Sun, 24 Jan 2021 10:42:07 -0800 (PST) Received: from localhost.localdomain ([31.210.181.203]) by smtp.gmail.com with ESMTPSA id t9sm7260266ejc.51.2021.01.24.10.42.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 24 Jan 2021 10:42:06 -0800 (PST) From: Amir Goldstein To: Jan Kara Cc: Matthew Bobrowski , linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [RFC][PATCH 0/2] unprivileged fanotify listener Date: Sun, 24 Jan 2021 20:42:02 +0200 Message-Id: <20210124184204.899729-1-amir73il@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Jan, These patches try to implement the minimal set and least controversial functionality that we can allow for unprivileged users as a starting point. I tried to be as conservative as I can with the system limits, but I wasn't sure how to handle the per group marks limit, so I left both per group and per user limits which looks quite confusing. I tested unprivileged listener with Matthew's LTP tests [1]. I do not have test for the sysfs tunables yet, but I verified that existing LTP tests fail when lowering each of the tunables to 1 and pass after setting them back up. I think that the sysfs tunables can be considered even without the unprivileged listener. Thanks, Amir. [1] https://github.com/amir73il/ltp/commits/fanotify_unpriv Amir Goldstein (2): fanotify: configurable limits via sysfs fanotify: support limited functionality for unprivileged users fs/notify/fanotify/fanotify.c | 14 ++- fs/notify/fanotify/fanotify_user.c | 155 +++++++++++++++++++++++++---- fs/notify/fdinfo.c | 3 +- include/linux/fanotify.h | 19 ++++ include/linux/fsnotify_backend.h | 2 +- include/linux/sched/user.h | 3 - include/linux/user_namespace.h | 4 + kernel/sysctl.c | 12 ++- kernel/ucount.c | 4 + 9 files changed, 183 insertions(+), 33 deletions(-) -- 2.25.1