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=-17.0 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,URIBL_BLOCKED,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 05B69C6369E for ; Wed, 18 Nov 2020 07:58:30 +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 7A7FE2080A for ; Wed, 18 Nov 2020 07:58:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="tP3bBIXB"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="e/HwAPAU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7A7FE2080A 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=ltAS6o2X/7B6rLPSN+WO5wAgPWSAdI5hBavzlelxcyo=; b=tP3bBIXBlbamkfwlHgpfD/Ymb w9AsyfNJOX16aQBCH8FiHEfy9lBk/sMbfrjtNWe0pDY43ponQuzQX7z7jrZy8hnPYZmVSu+h1+jwE D/mD2SAh3O/B8vuZ4dJZbYsnME1tnZJAv/Gb6f9KS0JQTp4AClkxmMrMjHD0gmDeUPsE2MCFtQPqd fLM/e9k0omh5XvtWfPTwAv5l+5zftmstMWLnvubb0XvQp6dH/Mz4mq1Yp5uvzz5ElLyuz8E9SJty8 DsFxbQXx8tl10z/quRqaST30U7DPiJMducV4XqnWrY3KSMF+kXWH47Rfxgm3Tg7adtP1vI9j6h0oW oVr9Ph3mQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kfILd-0002mR-GV; Wed, 18 Nov 2020 07:57:49 +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 1kfILV-0002jk-G7 for linux-mtd@lists.infradead.org; Wed, 18 Nov 2020 07:57:43 +0000 Received: from sol.attlocal.net (172-10-235-113.lightspeed.sntcca.sbcglobal.net [172.10.235.113]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8E936246AD; Wed, 18 Nov 2020 07:57:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1605686260; bh=BEN/nXkzCxItOwaUusssDXqaGvS3fLCaGZUERnKW1Rw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e/HwAPAUfwWD3CYv6a/mOp2hLJpW5wozpT1BNRIXXvp/OgkMuve+wzODbU6LKp9aY 53AJ0gl3dNvpSGTT5HLz5hglv0eYTUKfSUTZjgT1bf7/IFM+q027VDdVfpXVB4/OgZ Xhe6UjkN0HzYPb3P4upnVEXOgIwi61ADoShmv5qM= From: Eric Biggers To: linux-fscrypt@vger.kernel.org Subject: [PATCH 3/5] f2fs: prevent creating duplicate encrypted filenames Date: Tue, 17 Nov 2020 23:56:07 -0800 Message-Id: <20201118075609.120337-4-ebiggers@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201118075609.120337-1-ebiggers@kernel.org> References: <20201118075609.120337-1-ebiggers@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201118_025741_678637_EB6CE181 X-CRM114-Status: GOOD ( 14.39 ) 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-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-mtd@lists.infradead.org, stable@vger.kernel.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 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 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 cb700d797296..9a321c52face 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -3251,6 +3251,8 @@ 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/