From patchwork Wed Aug 11 20:48:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Paul Moore X-Patchwork-Id: 12431925 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,URIBL_BLOCKED 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 2F093C4338F for ; Wed, 11 Aug 2021 20:49:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 14E0B6104F for ; Wed, 11 Aug 2021 20:49:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231750AbhHKUuM (ORCPT ); Wed, 11 Aug 2021 16:50:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33662 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232111AbhHKUtJ (ORCPT ); Wed, 11 Aug 2021 16:49:09 -0400 Received: from mail-qt1-x82b.google.com (mail-qt1-x82b.google.com [IPv6:2607:f8b0:4864:20::82b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 487E0C061798 for ; Wed, 11 Aug 2021 13:48:45 -0700 (PDT) Received: by mail-qt1-x82b.google.com with SMTP id y9so3207745qtv.7 for ; Wed, 11 Aug 2021 13:48:45 -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=W2ePed7b7Zeoarrg+9WSGsiLd7Tb2w8iYG/B7ulmbOM=; b=Q08tdZC3zUhePwuBfcwpZb7XyB3p9/YOLKej65cWgZvCK44GhukGTCy7P4n4N52VJm NNSuFNgtNQJscN9oPIk4FKvmUBUhDfiSiD4KkdPD1nSw1AsrnLmmez5MtLCE8H9m991N UxIO0taVWsxssJtcZoIKlKCsv4Dstls0LYuB+5dHmvd2mFjEFMXJy0iphSS/e8PYzEmq av80NkD/yLdr1S1l049acLbgfGhHZQIZzxFHmRq6EpT/4Fdv2p5gcoJdeLwykGHHNoQ/ 4kvU03H9ff8x32JloScyj8/i7nmbLyVIwzvy1ozlMWUHXUzi5eDt5B/8/oJdnTZFUMFM X8LA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:date:message-id:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=W2ePed7b7Zeoarrg+9WSGsiLd7Tb2w8iYG/B7ulmbOM=; b=ZihZ5kMquIiH5n+Kk7RR9mWXNcKEaBoAygMz4mNkuWImQL6HuZTil7cFbW5NKnIanJ pnpmUAK+dBv1YQDKhEJn/+GS18+gE7Fq0pzL1qBLHp6T20qdXEF2sLijnRHMe3QW42X4 Y52s1UmjvQEEq6HYog4sBJz2Xrq9IzzoJHhYAT0/TrLCykM7IvDXVKNoU7oGoCeewFzv nYwTKuRqKS2BhUrQQG4KvAapBWw7LLng+BP3BuUSuYshNRSpb3OTs0q///UcpsXHxri9 7p/NWz58zZCYh2OQrJIdzG7WHLbBfvMM3wuASLjPRj5S+uBh4kXYJUjkEezNldQS9T5a GSHQ== X-Gm-Message-State: AOAM533qz0WQvbVH8BqbVZTs+K9KAzShrhOws+Y+TZATYY1ytG0ljg+K WwfmfO62walc5KTxojc9XA94KPmGtggBfMc= X-Google-Smtp-Source: ABdhPJzPm7vS80oH9l1MxGpWYzzRAHNbELlSvXDE1HIUCPH+TxQcMwQ+AA8dFa6dTLqb4NNtLM2rUQ== X-Received: by 2002:ac8:7207:: with SMTP id a7mr625967qtp.32.1628714923930; Wed, 11 Aug 2021 13:48:43 -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 c68sm178277qkf.48.2021.08.11.13.48.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Aug 2021 13:48:43 -0700 (PDT) Subject: [RFC PATCH v2 5/9] 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, Kumar Kartikeya Dwivedi , Jens Axboe , Pavel Begunkov Date: Wed, 11 Aug 2021 16:48:42 -0400 Message-ID: <162871492283.63873.8743976556992924333.stgit@olly> In-Reply-To: <162871480969.63873.9434591871437326374.stgit@olly> References: <162871480969.63873.9434591871437326374.stgit@olly> User-Agent: StGit/1.1 MIME-Version: 1.0 Precedence: bulk List-ID: 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. Signed-off-by: Paul Moore Acked-by: Mickaël Salaün --- 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,