From patchwork Sat Aug 12 00:41:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gabriel Krisman Bertazi X-Patchwork-Id: 13351601 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3609DC04A6A for ; Sat, 12 Aug 2023 00:42:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237152AbjHLAmA (ORCPT ); Fri, 11 Aug 2023 20:42:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52312 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237149AbjHLAl6 (ORCPT ); Fri, 11 Aug 2023 20:41:58 -0400 Received: from smtp-out1.suse.de (smtp-out1.suse.de [IPv6:2001:67c:2178:6::1c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AFEA6A6; Fri, 11 Aug 2023 17:41:58 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 74A9321885; Sat, 12 Aug 2023 00:41:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1691800917; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QeHgxjk4qHnUIIhBwhEx6gXjURKH4sMFZ4pmLOe7O5w=; b=M6lRGsatagECls+mo8KGm78FfdQNZ0/jdVBKAP2Rjx38U8NAhTPq35gZsf3OG0BXO5lhBe AZV09l4MIYo9KIIWjfZlETOF2FOth0F0Py0OnBenFTEap296C6KgSW2/n1z8YVPoUlqPnh FZ1V/i4WF3IiucfCmuz+3CXKxAVdeJk= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1691800917; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QeHgxjk4qHnUIIhBwhEx6gXjURKH4sMFZ4pmLOe7O5w=; b=jdAiTm5V8dYFS+EC0KOhewhYD6Pnb2AOJIKuth5oWk5h01Az2PxQv7mF9t1gVmCY+vIo+i PNq6DtbNGaHLGQDA== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 4031313592; Sat, 12 Aug 2023 00:41:57 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 95cQClXV1mQNEAAAMHmgww (envelope-from ); Sat, 12 Aug 2023 00:41:57 +0000 From: Gabriel Krisman Bertazi To: viro@zeniv.linux.org.uk, brauner@kernel.org, tytso@mit.edu, ebiggers@kernel.org, jaegeuk@kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, Gabriel Krisman Bertazi Subject: [PATCH v5 02/10] ecryptfs: Reject casefold directory inodes Date: Fri, 11 Aug 2023 20:41:38 -0400 Message-ID: <20230812004146.30980-3-krisman@suse.de> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230812004146.30980-1-krisman@suse.de> References: <20230812004146.30980-1-krisman@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Even though it seems to be able to resolve some names of case-insensitive directories, the lack of d_hash and d_compare means we end up with a broken state in the d_cache. Considering it was never a goal to support these two together, and we are preparing to use d_revalidate in case-insensitive filesystems, which would make the combination even more broken, reject any attempt to get a casefolded inode from ecryptfs. Signed-off-by: Gabriel Krisman Bertazi --- fs/ecryptfs/inode.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 83274915ba6d..1305dc49df78 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -78,6 +78,14 @@ static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) return ERR_PTR(-EXDEV); + + /* Reject dealing with casefold directories. */ + if (S_ISDIR(lower_inode->i_mode) && dir_is_casefolded(lower_inode)) { + pr_err_ratelimited("%s: Can't handle casefolded directory.\n", + __func__); + return ERR_PTR(-EREMOTE); + } + if (!igrab(lower_inode)) return ERR_PTR(-ESTALE); inode = iget5_locked(sb, (unsigned long)lower_inode,