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 E4310C5519F for ; Wed, 18 Nov 2020 07:58:27 +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 648C42080A for ; Wed, 18 Nov 2020 07:58:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="JG8e15aB"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="c7cLjJHQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 648C42080A 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=23idaewOcmMBtNSht3XpkuXXymmUgDI1JU4yAjs1Yuc=; b=JG8e15aBywe4JWA2SSUbcLRE0 O+8hdfAwoM1hTMWcVoiYWAApew9zgoKsqLLey0fcjp7cE7/D0ExwcBcihNV/5SfzlbYDjmcQR1dqY qyGDVS/jqgD6i9VA7MyuZoxFSWkwRWNhePmQ5IaW/YMgZPNLnqoU7rFu6iZDjxy4bBS6HoqRKr2ND T5R4LCRVvAz//tuDU1BNuZqSvUXs7F9rGsuftSj2FfqlymBX+7MMNvxu+YWQEZQZKGF9RicHWQM37 72an5GUsFhzRuLDnDR9VSAghTKcZU9ce9EAIwu8gm6MrzDf6njV+eD6GBurtV1aLGhQBReOsyr9sy hTZkBnE/A==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kfILb-0002mB-W4; Wed, 18 Nov 2020 07:57:48 +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-0002jJ-2K for linux-mtd@lists.infradead.org; Wed, 18 Nov 2020 07:57:42 +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 2419920B80; 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=3OsEYdcS4OXEC4S/G7MM1sLUIzE8N1bOkGh+royk33o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c7cLjJHQpC3nSDFO4proY4QRa0P96Ih6le3z/91WWyOKE3Z5PochE5fqjTob041/2 brGZ+WeaJWqgDddJkzN1St9g7Zks55FLOKIMmNgj4ZyafhYDB9odDybtwvl4NrdhlV /e1eD0rWkK/diWMI77ke9p3Nzz9WadhOoZc1xss0= From: Eric Biggers To: linux-fscrypt@vger.kernel.org Subject: [PATCH 2/5] ext4: prevent creating duplicate encrypted filenames Date: Tue, 17 Nov 2020 23:56:06 -0800 Message-Id: <20201118075609.120337-3-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_240100_3A541311 X-CRM114-Status: GOOD ( 13.18 ) 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 ext4 by rejecting no-key dentries in ext4_add_entry(). Note that the duplicate check in ext4_find_dest_de() sometimes prevented this bug. However in many cases it didn't, since ext4_find_dest_de() doesn't examine every dentry. Fixes: 4461471107b7 ("ext4 crypto: enable filename encryption") Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers --- fs/ext4/namei.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 33509266f5a0..793fc7db9d28 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -2195,6 +2195,9 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry, if (!dentry->d_name.len) return -EINVAL; + if (fscrypt_is_nokey_name(dentry)) + return -ENOKEY; + #ifdef CONFIG_UNICODE if (sb_has_strict_encoding(sb) && IS_CASEFOLDED(dir) && sb->s_encoding && utf8_validate(sb->s_encoding, &dentry->d_name)) -- 2.29.2 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/