From patchwork Tue Sep 14 03:33:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Paul Moore X-Patchwork-Id: 12491571 X-Patchwork-Delegate: paul@paul-moore.com 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=-13.8 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 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 6AC16C433F5 for ; Tue, 14 Sep 2021 03:33:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 539D860EE7 for ; Tue, 14 Sep 2021 03:33:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239078AbhINDeh (ORCPT ); Mon, 13 Sep 2021 23:34:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55846 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238952AbhINDef (ORCPT ); Mon, 13 Sep 2021 23:34:35 -0400 Received: from mail-qt1-x832.google.com (mail-qt1-x832.google.com [IPv6:2607:f8b0:4864:20::832]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 55FA9C061760 for ; Mon, 13 Sep 2021 20:33:18 -0700 (PDT) Received: by mail-qt1-x832.google.com with SMTP id w17so10148353qta.9 for ; Mon, 13 Sep 2021 20:33:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=paul-moore-com.20150623.gappssmtp.com; s=20150623; h=subject:from:to:date:message-id:in-reply-to:references:user-agent :mime-version:content-transfer-encoding; bh=yIvUop3P/60QYLtm8bDVCxAY3B7HwxRQ7AkWTc9jkh8=; b=UgU+ZGMcIRDHUazzWyvjbnYgPk38HeUD054UfCNUk/5P8rMXNbD5DbpJzY2/NwJnbk B+FrHS7LvYvCnLVPoGMgntRSQFOsg9Nl2QuKfmRRuwVlVHaPeLR3hTpWCAdxJD1Tqjxx fKv8n0cbftyErcP0rY5NC1WMglM9KHmxLUXmHHwrTVoapBa6SN75vlNjd8L601C/hW+E K23NCl8EpLdbAFG+GCr1uW2f2QeqmRPnnT4V3q/Da25J1ItCbI4ajKE4Y6jAo10guLnV s7/cYgSka8Q9cSrCPWDyvf+FBqMVkoscIqz/iiVoX61wrdHFN5316lXkBzpQ1De4hVXQ TDtA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:subject:from:to:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=yIvUop3P/60QYLtm8bDVCxAY3B7HwxRQ7AkWTc9jkh8=; b=F+z2WwLuaDpux4T8MYXCCtEPK11iEiEzQm+naSp5DNs5H8yCX3rCCKP27/coJzV6L+ QEHknwYp6PFm3iHR6t0Yk95hlnpyB5iZ0OuUQeSZHad0eGIipNBBgGwdvfXYrun+U4lK omo/pzjhR8oSb5AQfOPOdmAMOMH4XnuqOx/cPkaaC1LZlILv/Lr7p5FEfiwdF0tpyvJD 6bj9ctfvB88l1AdqZ2PLvtsZKEYKqwBqNaqIj7DloGAhAOnZc5WzXFgABFfLvU529bJD RxVtXJ740Lb1rDoxg41Mrf0DfbJbeqJXLo2lyoFzdVSCDWQmGrrzmm/RGeMnav3RwEr9 J0Dg== X-Gm-Message-State: AOAM530OCl9GEJsI2kAoP7mAnA9mbaBVXcXeg3zgrgGYJjbu0o13w9wj he0nPc52o4TIj+wPGLK4Ka3v X-Google-Smtp-Source: ABdhPJyBLgu6nnMNu0XNtQrmb84WAJq+QQFJ7unI1AirZRKDx5A8vQSop0c3lfor668lSPDvc9ZMMA== X-Received: by 2002:a05:622a:1c6:: with SMTP id t6mr2748253qtw.390.1631590397433; Mon, 13 Sep 2021 20:33:17 -0700 (PDT) Received: from localhost (pool-96-237-52-188.bstnma.fios.verizon.net. [96.237.52.188]) by smtp.gmail.com with ESMTPSA id u7sm5288981qtc.75.2021.09.13.20.33.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Sep 2021 20:33:17 -0700 (PDT) Subject: [PATCH v3 4/8] fs: add anon_inode_getfile_secure() similar to anon_inode_getfd_secure() From: Paul Moore To: linux-security-module@vger.kernel.org, selinux@vger.kernel.org, linux-audit@redhat.com, io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org, Jens Axboe , Pavel Begunkov , Kumar Kartikeya Dwivedi Date: Mon, 13 Sep 2021 23:33:16 -0400 Message-ID: <163159039643.470089.15401020922378832012.stgit@olly> In-Reply-To: <163159032713.470089.11728103630366176255.stgit@olly> References: <163159032713.470089.11728103630366176255.stgit@olly> User-Agent: StGit/1.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org Extending the secure anonymous inode support to other subsystems requires that we have a secure anon_inode_getfile() variant in addition to the existing secure anon_inode_getfd() variant. Thankfully we can reuse the existing __anon_inode_getfile() function and just wrap it with the proper arguments. Acked-by: Mickaël Salaün Signed-off-by: Paul Moore --- v3: - no change v2: - no change v1: - initial draft --- fs/anon_inodes.c | 29 +++++++++++++++++++++++++++++ include/linux/anon_inodes.h | 4 ++++ 2 files changed, 33 insertions(+) diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c index a280156138ed..e0c3e33c4177 100644 --- a/fs/anon_inodes.c +++ b/fs/anon_inodes.c @@ -148,6 +148,35 @@ struct file *anon_inode_getfile(const char *name, } EXPORT_SYMBOL_GPL(anon_inode_getfile); +/** + * anon_inode_getfile_secure - Like anon_inode_getfile(), but creates a new + * !S_PRIVATE anon inode rather than reuse the + * singleton anon inode and calls the + * inode_init_security_anon() LSM hook. This + * allows for both the inode to have its own + * security context and for the LSM to enforce + * policy on the inode's creation. + * + * @name: [in] name of the "class" of the new file + * @fops: [in] file operations for the new file + * @priv: [in] private data for the new file (will be file's private_data) + * @flags: [in] flags + * @context_inode: + * [in] the logical relationship with the new inode (optional) + * + * The LSM may use @context_inode in inode_init_security_anon(), but a + * reference to it is not held. Returns the newly created file* or an error + * pointer. See the anon_inode_getfile() documentation for more information. + */ +struct file *anon_inode_getfile_secure(const char *name, + const struct file_operations *fops, + void *priv, int flags, + const struct inode *context_inode) +{ + return __anon_inode_getfile(name, fops, priv, flags, + context_inode, true); +} + static int __anon_inode_getfd(const char *name, const struct file_operations *fops, void *priv, int flags, diff --git a/include/linux/anon_inodes.h b/include/linux/anon_inodes.h index 71881a2b6f78..5deaddbd7927 100644 --- a/include/linux/anon_inodes.h +++ b/include/linux/anon_inodes.h @@ -15,6 +15,10 @@ struct inode; struct file *anon_inode_getfile(const char *name, const struct file_operations *fops, void *priv, int flags); +struct file *anon_inode_getfile_secure(const char *name, + const struct file_operations *fops, + void *priv, int flags, + const struct inode *context_inode); int anon_inode_getfd(const char *name, const struct file_operations *fops, void *priv, int flags); int anon_inode_getfd_secure(const char *name,