From patchwork Tue Jun 15 14:13:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12321921 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,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 3ECF3C48BE5 for ; Tue, 15 Jun 2021 14:16:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0F38A61001 for ; Tue, 15 Jun 2021 14:16:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231477AbhFOOS4 (ORCPT ); Tue, 15 Jun 2021 10:18:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230079AbhFOORK (ORCPT ); Tue, 15 Jun 2021 10:17:10 -0400 Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B42AFC0613A2 for ; Tue, 15 Jun 2021 07:14:02 -0700 (PDT) Received: by mail-pl1-x62c.google.com with SMTP id u18so7909640plc.0 for ; Tue, 15 Jun 2021 07:14:02 -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=Q98Ihm2Nik3q5vdP0zcSt08K34vWS/rvAoSEN52J/uuTlzvnsiNq88Z5ucJKY0yf4T WFJOezngtVgbaHQTYK9IFHEeP7OPorUcohm0GpwG5OPARKnRlnDiuj+ZSJdIkZhENFhP Vq0P8aiksUKM/urNGX/K/vS0M5QV+Ai6ruEHeoTG1ZqikOBMRgtepe++5r/KmuRM0Wp7 fQBL37D40now9tM5jNX9bzTs/tFtUeKXIWuG8uRaMPZOawdA+TREx5a2jmwy7Z5WlYma oneZ7pit7q6XulGSMFYPI+9TNvoTTQj76XvP+orlujxi0oRlAXS8GnDtyHjoFs7/bu4w pIwg== 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=NLikDNQyLquYBuTtCNf/QzVvNOza54jXMluPT7CzUlAvTfZyFVaaf0+VkVTdjP2oRO P4etgKAASr5Fu+Dhk1jPcK65MSU0tlXLNM04Fbiu7FJF9GFcWMo/Uc58ilqgb+5Q61/R TrIHzv4E7c+GkZ2Jrl1rlfVZmmhHyV2rlUXjv+1q+3zPJUUSihBgGRwyCPs4WULX4tJo vrJJXepVRCywMEZw+bZKHkXC275lHIDayJB+BUwnNIOrnWAKjLuleu4DSj70LsvC8A6b KeMSQxOEHFYtf21jFRWG2mDfs7waOhVddfPKu3tNzHx/ZZxxRmWXHHkJXyedBVm2VSwt JGIA== X-Gm-Message-State: AOAM5311ss3ilaki2AC7w7XocgDP6virNEFT90hqopK+UZ4evqTgZ1Gt mIKoMs6UNH8g1tqbWYSJlZBI X-Google-Smtp-Source: ABdhPJyMTsqXCPkyBqwNtnh8NXZihbFI2JopRQ8BKBQqq64DywQJiFaJ/V9M6qRN7G+4EeFFkHyAjg== X-Received: by 2002:a17:90b:b18:: with SMTP id bf24mr25002261pjb.220.1623766442317; Tue, 15 Jun 2021 07:14:02 -0700 (PDT) Received: from localhost ([139.177.225.241]) by smtp.gmail.com with ESMTPSA id u13sm16031239pga.64.2021.06.15.07.14.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Jun 2021 07:14:01 -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 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 v8 02/10] file: Export receive_fd() to modules Date: Tue, 15 Jun 2021 22:13:23 +0800 Message-Id: <20210615141331.407-3-xieyongji@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210615141331.407-1-xieyongji@bytedance.com> References: <20210615141331.407-1-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 --- 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);