From patchwork Wed Nov 18 10:47:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Giuseppe Scrivano X-Patchwork-Id: 11914761 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=-10.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 6AF3AC56202 for ; Wed, 18 Nov 2020 10:48:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0980622228 for ; Wed, 18 Nov 2020 10:48:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="STp3Ht+R" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726629AbgKRKr6 (ORCPT ); Wed, 18 Nov 2020 05:47:58 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:31503 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726249AbgKRKr5 (ORCPT ); Wed, 18 Nov 2020 05:47:57 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605696477; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=d1ViazE1oJ7ZzrekNrldTatPxa+EknhxU8UIoPVA6q0=; b=STp3Ht+R1/3M0HG4Nng1UkPco+thlNJ1VTMX62fK9cOAvKHHiAYa69zYjMQcrnPU77Ak2L kSzRLYuh740yozCvDFrR2xASOOhWCd4VxiY3ZX4FfJ8sAUORfBRzkC2tA/J2jSGAnvH9vE wtaznxZLR6FzGK7Fz2fy2tPiMd3PFYo= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-286-QPENoFnWNfunk1vroYYsTw-1; Wed, 18 Nov 2020 05:47:54 -0500 X-MC-Unique: QPENoFnWNfunk1vroYYsTw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E76551007B26; Wed, 18 Nov 2020 10:47:52 +0000 (UTC) Received: from lithium.redhat.com (ovpn-113-143.ams2.redhat.com [10.36.113.143]) by smtp.corp.redhat.com (Postfix) with ESMTP id A1F2960C05; Wed, 18 Nov 2020 10:47:50 +0000 (UTC) From: Giuseppe Scrivano To: linux-kernel@vger.kernel.org, christian.brauner@ubuntu.com Cc: linux@rasmusvillemoes.dk, viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org, containers@lists.linux-foundation.org Subject: [PATCH v3 0/2] fs, close_range: add flag CLOSE_RANGE_CLOEXEC Date: Wed, 18 Nov 2020 11:47:44 +0100 Message-Id: <20201118104746.873084-1-gscrivan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org When the new flag is used, close_range will set the close-on-exec bit for the file descriptors instead of close()-ing them. It is useful for e.g. container runtimes that want to minimize the number of syscalls used after a seccomp profile is installed but want to keep some fds open until the container process is executed. v3: - fixed indentation - selftests: use ASSERT_EQ instead of EXPECT_EQ for hard failures v2: https://lkml.kernel.org/lkml/20201019102654.16642-1-gscrivan@redhat.com/ - move close_range(..., CLOSE_RANGE_CLOEXEC) implementation to a separate function. - use bitmap_set() to set the close-on-exec bits in the bitmap. - add test with rlimit(RLIMIT_NOFILE) in place. - use "cur_max" that is already used by close_range(..., 0). v1: https://lkml.kernel.org/lkml/20201013140609.2269319-1-gscrivan@redhat.com/ Giuseppe Scrivano (2): fs, close_range: add flag CLOSE_RANGE_CLOEXEC selftests: core: add tests for CLOSE_RANGE_CLOEXEC fs/file.c | 44 ++++++++--- include/uapi/linux/close_range.h | 3 + .../testing/selftests/core/close_range_test.c | 74 +++++++++++++++++++ 3 files changed, 111 insertions(+), 10 deletions(-) --- 2.28.0