From patchwork Thu Jul 29 07:34:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12407947 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 60C74C4320A for ; Thu, 29 Jul 2021 07:36:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 47FE960FD7 for ; Thu, 29 Jul 2021 07:36:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234759AbhG2HgO (ORCPT ); Thu, 29 Jul 2021 03:36:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46644 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234791AbhG2HgL (ORCPT ); Thu, 29 Jul 2021 03:36:11 -0400 Received: from mail-pl1-x62f.google.com (mail-pl1-x62f.google.com [IPv6:2607:f8b0:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EDE78C061765 for ; Thu, 29 Jul 2021 00:36:08 -0700 (PDT) Received: by mail-pl1-x62f.google.com with SMTP id d1so5983952pll.1 for ; Thu, 29 Jul 2021 00:36:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=x7lCOA+2uHcoDlHpnAPiyr08qHLnKknrRwhD42bW14c=; b=L3+zrqxq1jDIch5mBMRlq4aMkZWeJXNgz//RgYj4u3V1lMU7q20ZSp16442c0mWaWo 3pimykQ5c3xo5hFxpe8YP2kPqJRUDXMEfySemYatlQJMfgm4TKPWnxljrQ4scQVJVmAe SgYBeBiHSj6pBrjI7edJBnGY1o6V08/DYlBoSrgQMsrmRK906zgqaAWchZrUKOHWJ1s2 G28MPqjFEY3cvBXfzP0Rxts8xu3e5wgWbnD4qAUWn0c4JOpCgg0t7ExynJrXsb/Lqv0X wvgLL4SNtH3zcQoSC98vHFIPnTb8V3qERqJnvlidDS9Zlh9UapAb0RrBTxogd7yCCZ8j K9/A== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=x7lCOA+2uHcoDlHpnAPiyr08qHLnKknrRwhD42bW14c=; b=XR+ORaYV5l2zvv/G5zV86QPsNWvcqS5cCCvmx9ZoH68s106EDtKax4ayu9Gd6K5rs+ X6ucJltG5lG43KI1t0aNMG8VYNTdFjyWJQZuLan+6ZdHnaO2YC1xofE9n1mACqij53Xk iFC5jIpglZugumd1cPCFdQP5qtxNC0Wz4yBAdk38P7DVoWRH/WznijjE4siyDbdH2EAG edExKx2C+jimJG3hJlCD4eDS4dEnoxiDVcKg2S4KZGRcMOwo9i48QLVaUy3JGo5Sdl2m GrBRPgu49fi9rnMVeciSboThPXdmnPn5/ZxAtZebwf86MMNVpUixEUnQ7wQcb8yVaaR8 FS6g== X-Gm-Message-State: AOAM533ZfXuAeAgLvY/qW0zU/5Hf4a1kC9HqpxfnUmlUOQ7FyVhJuwwe 9Mq9nS5mlV2BrdUdQAvDz9y2 X-Google-Smtp-Source: ABdhPJz6gtDSzVbKQwR9fMTMuBAxDE/HudL65A5sjPsB1aFvsDsAWmfl9tE1fqIYigp4LRfAx1lPGg== X-Received: by 2002:a62:804b:0:b029:328:db41:1f47 with SMTP id j72-20020a62804b0000b0290328db411f47mr3610895pfd.43.1627544168542; Thu, 29 Jul 2021 00:36:08 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id y8sm2535031pfe.162.2021.07.29.00.36.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Jul 2021 00:36:08 -0700 (PDT) From: Xie Yongji To: mst@redhat.com, jasowang@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, parav@nvidia.com, hch@infradead.org, christian.brauner@canonical.com, rdunlap@infradead.org, willy@infradead.org, viro@zeniv.linux.org.uk, axboe@kernel.dk, bcrl@kvack.org, corbet@lwn.net, mika.penttila@nextfour.com, dan.carpenter@oracle.com, joro@8bytes.org, gregkh@linuxfoundation.org, zhe.he@windriver.com, xiaodong.liu@intel.com, joe@perches.com Cc: songmuchun@bytedance.com, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: [PATCH v10 02/17] file: Export receive_fd() to modules Date: Thu, 29 Jul 2021 15:34:48 +0800 Message-Id: <20210729073503.187-3-xieyongji@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210729073503.187-1-xieyongji@bytedance.com> References: <20210729073503.187-1-xieyongji@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Export receive_fd() so that some modules can use it to pass file descriptor between processes without missing any security stuffs. Signed-off-by: Xie Yongji Acked-by: Jason Wang --- fs/file.c | 6 ++++++ include/linux/file.h | 7 +++---- 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/fs/file.c b/fs/file.c index 86dc9956af32..210e540672aa 100644 --- a/fs/file.c +++ b/fs/file.c @@ -1134,6 +1134,12 @@ int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags) return new_fd; } +int receive_fd(struct file *file, unsigned int o_flags) +{ + return __receive_fd(file, NULL, o_flags); +} +EXPORT_SYMBOL_GPL(receive_fd); + static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags) { int err = -EBADF; diff --git a/include/linux/file.h b/include/linux/file.h index 2de2e4613d7b..51e830b4fe3a 100644 --- a/include/linux/file.h +++ b/include/linux/file.h @@ -94,6 +94,9 @@ extern void fd_install(unsigned int fd, struct file *file); extern int __receive_fd(struct file *file, int __user *ufd, unsigned int o_flags); + +extern int receive_fd(struct file *file, unsigned int o_flags); + static inline int receive_fd_user(struct file *file, int __user *ufd, unsigned int o_flags) { @@ -101,10 +104,6 @@ static inline int receive_fd_user(struct file *file, int __user *ufd, return -EFAULT; return __receive_fd(file, ufd, o_flags); } -static inline int receive_fd(struct file *file, unsigned int o_flags) -{ - return __receive_fd(file, NULL, o_flags); -} int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags); extern void flush_delayed_fput(void);