From patchwork Tue Aug 31 10:36:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12466939 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 E94D9C4320E for ; Tue, 31 Aug 2021 10:39:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CFC0C601FD for ; Tue, 31 Aug 2021 10:39:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241110AbhHaKjx (ORCPT ); Tue, 31 Aug 2021 06:39:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241107AbhHaKi3 (ORCPT ); Tue, 31 Aug 2021 06:38:29 -0400 Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7B4A1C0617AF for ; Tue, 31 Aug 2021 03:37:15 -0700 (PDT) Received: by mail-pf1-x42b.google.com with SMTP id m26so14633206pff.3 for ; Tue, 31 Aug 2021 03:37:15 -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=CkhRtVDUgb41zlq5OfgVAHJFRMwL0PptQO/kVg6fccA=; b=wb1QmOQoMFVShBMn9y6KTytH5q1BZ0H1hJ3YO5uXgTFjLoGaoSepJJ5OlbhccHu/AJ wAiGO67xMVtU0t2LrJWcMBK/NhTSX6ZkR3DOqmyntbAg6jf+Cr1K9Cw8Xhb1KbRfFq5f 0PiM2QpjLxqt7Y8TQAgsTNp6GYrUDvE9Lh/oajmuWt89WT4dDtxIROjBFBxpqguUKBU7 LLMz+DXMsZEm4Eg593FHxtTTvCsA6fIWSzAN4+6DPx7X3FPKVNWqVAX/Kck7QYFDzzcC d2NfPV00YlGSbPc1qoUeYTZUD6zpXTRPBo7PsZ9aFWAnnS/G89GxBIlH9Z/mgTPMxFx/ rbnA== 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=CkhRtVDUgb41zlq5OfgVAHJFRMwL0PptQO/kVg6fccA=; b=AXOGDcsjTxmDM73FMMcaCV/2V76R39td2rBm6soVuTqo456C/20U9oouC6kI7kMjOM rvZmEQJJZ5b30RTQyGS0iHOKnA8uHn88tDxTJE+rfmuzUR0wHiiWf8MxvLFChVfrSUhJ OU7PHFxYh7KZ5Dw8gQYKcrIFf5xjSRMgJfuNBhPPPn6K3dMt7mNhL65kQQBn6FkoceUm PH9nNK8DL1rDcWMERJESDcbALC6+NYuGUsfT8/vj0oTWNCummFRbR/MymAzjyZe0f4oo QkH+yeO7oKYrAN8+8TPOItLEFOvrS4JxlSsHVo43JQTkpHpExkYx298HwpdU2bt4KsIs 44ng== X-Gm-Message-State: AOAM531No/RqQv57tb9o0AnsbX6iUsjLktbPgaBV4tELY6N/yFg18YbQ Wgblfq6vd/LkAhk809WXRACZ X-Google-Smtp-Source: ABdhPJzBeHb26ioOoBceC1KZUNqQKw0qJ8cn0b2Nhenwq0dSjkYw4fqu/cKwDwROR4HestxrtqNmDQ== X-Received: by 2002:aa7:999c:0:b0:3f2:8100:79c2 with SMTP id k28-20020aa7999c000000b003f2810079c2mr22685875pfh.80.1630406235060; Tue, 31 Aug 2021 03:37:15 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id 15sm2641504pjw.39.2021.08.31.03.37.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Aug 2021 03:37:14 -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, robin.murphy@arm.com, will@kernel.org, john.garry@huawei.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 v13 03/13] file: Export receive_fd() to modules Date: Tue, 31 Aug 2021 18:36:24 +0800 Message-Id: <20210831103634.33-4-xieyongji@bytedance.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210831103634.33-1-xieyongji@bytedance.com> References: <20210831103634.33-1-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);