From mboxrd@z Thu Jan 1 00:00:00 1970 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=-17.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 BC300C433E6 for ; Mon, 28 Dec 2020 19:14:08 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 81E42229EF for ; Mon, 28 Dec 2020 19:14:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 81E42229EF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=1EjFvKGRmBSpeJ6A5iSLJ7ogFA815XC1JFp0jJH8EdQ=; b=KRwBEUq+1xTsQrK/hQmc9SKjw TOp3xnPgcv8FnMUPecuRd2WbyK8+y4O7rQymFIj/zZ4sg8BCtTjU7DirFCtCxdenMoAyV0t7q464i lZNIyweEWdjAAjJ2xUMv47W2bZTOdwVLxWYTH+J1sa2E7jx/bupXOX+4l+px4pI/G8j0vl9dBGZyG EwUHz7PJNSWP4jFBFysnXtaST11BsDUYG+wLQdqCxJxDd3VOBidc68+OvclexEAdZjRf7tIUvS3Qx Bys2APtMbS9LjNg9yb7qAgHWJrw+CkShZ8uQsH6Im0+u8JbbVeSlbqELRNvz/uJE+CPlSro9GMt4J iQmi+7VNQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ktxxO-00016U-81; Mon, 28 Dec 2020 19:13:26 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ktxxF-00013d-Vm for linux-mtd@lists.infradead.org; Mon, 28 Dec 2020 19:13:19 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3A51022B2C; Mon, 28 Dec 2020 19:13:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1609182797; bh=IXmvQye9ZM3vzPLg/kY4jseJxfvpVBcbyPuNjzHTWF4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jQya9WijPGAu5QKp6aRvs3aDB653D8Hv76AV5phKUMDyWFMiaAg4MHTwjj1RBt+7M iyq/ZgVltry9M+5t2oZs30wMF/G6NKjpDSCP1XT4ZmTnB067VauLZvLoC91sIZm7iw rkxpkiOCBwKY6rs/hwNhLjIlse4VYM8/FyBwuFDsCrFl3caRxhXwwvflQNIoNXRn5N ZDtjg/qlyXGK7W8/kndpbTOxYKbUJvmR7QFeuUdu+YQ1SZCDndIiP2EQkHPrLdN9kJ gfuDSlv09IpTCUmUEzasmBHTocNpQCUBmrVFqWHIx7yE7hUOJk8jOcu73YMA8+60hO KxlKk0BLmhKuA== From: Eric Biggers To: stable@vger.kernel.org Subject: [PATCH 4.19 3/4] f2fs: prevent creating duplicate encrypted filenames Date: Mon, 28 Dec 2020 11:12:10 -0800 Message-Id: <20201228191211.138300-4-ebiggers@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228191211.138300-1-ebiggers@kernel.org> References: <20201228191211.138300-1-ebiggers@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201228_141318_278591_EE139C39 X-CRM114-Status: GOOD ( 11.67 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fscrypt@vger.kernel.org, linux-ext4@vger.kernel.org, linux-mtd@lists.infradead.org, linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org From: Eric Biggers commit bfc2b7e8518999003a61f91c1deb5e88ed77b07d upstream. As described in "fscrypt: add fscrypt_is_nokey_name()", it's possible to create a duplicate filename in an encrypted directory by creating a file concurrently with adding the directory's encryption key. Fix this bug on f2fs by rejecting no-key dentries in f2fs_add_link(). Note that the weird check for the current task in f2fs_do_add_link() seems to make this bug difficult to reproduce on f2fs. Fixes: 9ea97163c6da ("f2fs crypto: add filename encryption for f2fs_add_link") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20201118075609.120337-4-ebiggers@kernel.org Signed-off-by: Eric Biggers --- fs/f2fs/f2fs.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 53ffa6fe207a3..aacd8e11758ca 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -2857,6 +2857,8 @@ bool f2fs_empty_dir(struct inode *dir); static inline int f2fs_add_link(struct dentry *dentry, struct inode *inode) { + if (fscrypt_is_nokey_name(dentry)) + return -ENOKEY; return f2fs_do_add_link(d_inode(dentry->d_parent), &dentry->d_name, inode, inode->i_ino, inode->i_mode); } -- 2.29.2 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/