From patchwork Thu Jun 6 07:33:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eugen Hristev X-Patchwork-Id: 13687933 Received: from madrid.collaboradmins.com (madrid.collaboradmins.com [46.235.227.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1D44513C909; Thu, 6 Jun 2024 07:34:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=46.235.227.194 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717659282; cv=none; b=RIszufuFG9FnRVv/2UdPLXAQ0VbzFXT6H2iARhIfmZZSgEPDBaK+Lni2IfQjd2bSoIizTMqRJyF+aL+5HMUbVD6e0V35oaZD3Nnb4OPLrRc/0nv+tAH6PLX4hCbJz4DtzLLrymJ7kODK2dA7QXewiqX0wcbPFGcFrIdTzZoVTR8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717659282; c=relaxed/simple; bh=rlMURjyaViS+5a1sk9a9sm2hp548o3HFgVlj/d1hyYk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=IJO5M8qj8lUIAEgVfAXSvTHXrE69JFjZpAFh4mOC4oUpapL0rz0hboVWK/SX1mOKh+rVB6lJar2ZFlhO0Gcq0wHYHHaKDL+iZLZhLTf0Zh8Yulq/5gIuVCiCfRWmfBauko/JdlsZyw336b6cr1Q1yluzSKKwVbgj91ZLgYG8820= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b=N9chowkS; arc=none smtp.client-ip=46.235.227.194 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b="N9chowkS" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1717659279; bh=rlMURjyaViS+5a1sk9a9sm2hp548o3HFgVlj/d1hyYk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=N9chowkSpWbYOTOW6UTv+qUyMfbxa/WZGqz4M++76LavUPf8DWIi+YdG+Hc+KFOhP OIujPsmgMeB1vkdkJUPUkwcI4DOQducW/RqF+axZxkL+4fbJqGRLpNS86mh7ruAA+8 OISSH79ZKX37JRRrL3MjouZ4mJxqpgt5fdbJiLuia0zDDKncbbkdq6vZNv4zukF+1a SqxwpBNWXwe7ULnY5h0tXO1oOltkwRJpMTm0Rml0sKek2rYsmkj8dG8oMrv/ieR23T KEWxS8+E4b1190eMkdoaSuEPYIfDrKXuequh+tq2gkrlGCFxKUsSZfVXav204DxIXW CrNRZQIA2MTJQ== Received: from eugen-station.. (cola.collaboradmins.com [195.201.22.229]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: ehristev) by madrid.collaboradmins.com (Postfix) with ESMTPSA id 8251137821DE; Thu, 6 Jun 2024 07:34:38 +0000 (UTC) From: Eugen Hristev To: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, jaegeuk@kernel.org, adilger.kernel@dilger.ca, tytso@mit.edu Cc: chao@kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, ebiggers@google.com, krisman@suse.de, kernel@collabora.com, Gabriel Krisman Bertazi , Eugen Hristev Subject: [PATCH v18 4/7] ext4: Reuse generic_ci_match for ci comparisons Date: Thu, 6 Jun 2024 10:33:50 +0300 Message-Id: <20240606073353.47130-5-eugen.hristev@collabora.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240606073353.47130-1-eugen.hristev@collabora.com> References: <20240606073353.47130-1-eugen.hristev@collabora.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Gabriel Krisman Bertazi Instead of reimplementing ext4_match_ci, use the new libfs helper. It also adds a comment explaining why fname->cf_name.name must be checked prior to the encryption hash optimization, because that tripped me before. Signed-off-by: Gabriel Krisman Bertazi Signed-off-by: Eugen Hristev Reviewed-by: Eric Biggers --- fs/ext4/namei.c | 87 +++++++++++++------------------------------------ 1 file changed, 22 insertions(+), 65 deletions(-) diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index ec4c9bfc1057..d10ea0f3f64d 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -1390,58 +1390,6 @@ static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block) } #if IS_ENABLED(CONFIG_UNICODE) -/* - * Test whether a case-insensitive directory entry matches the filename - * being searched for. If quick is set, assume the name being looked up - * is already in the casefolded form. - * - * Returns: 0 if the directory entry matches, more than 0 if it - * doesn't match or less than zero on error. - */ -static int ext4_ci_compare(const struct inode *parent, const struct qstr *name, - u8 *de_name, size_t de_name_len, bool quick) -{ - const struct super_block *sb = parent->i_sb; - const struct unicode_map *um = sb->s_encoding; - struct fscrypt_str decrypted_name = FSTR_INIT(NULL, de_name_len); - struct qstr entry = QSTR_INIT(de_name, de_name_len); - int ret; - - if (IS_ENCRYPTED(parent)) { - const struct fscrypt_str encrypted_name = - FSTR_INIT(de_name, de_name_len); - - decrypted_name.name = kmalloc(de_name_len, GFP_KERNEL); - if (!decrypted_name.name) - return -ENOMEM; - ret = fscrypt_fname_disk_to_usr(parent, 0, 0, &encrypted_name, - &decrypted_name); - if (ret < 0) - goto out; - entry.name = decrypted_name.name; - entry.len = decrypted_name.len; - } - - if (quick) - ret = utf8_strncasecmp_folded(um, name, &entry); - else - ret = utf8_strncasecmp(um, name, &entry); - if (ret < 0) { - /* Handle invalid character sequence as either an error - * or as an opaque byte sequence. - */ - if (sb_has_strict_encoding(sb)) - ret = -EINVAL; - else if (name->len != entry.len) - ret = 1; - else - ret = !!memcmp(name->name, entry.name, entry.len); - } -out: - kfree(decrypted_name.name); - return ret; -} - int ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname, struct ext4_filename *name) { @@ -1503,20 +1451,29 @@ static bool ext4_match(struct inode *parent, #if IS_ENABLED(CONFIG_UNICODE) if (IS_CASEFOLDED(parent) && (!IS_ENCRYPTED(parent) || fscrypt_has_encryption_key(parent))) { - if (fname->cf_name.name) { - if (IS_ENCRYPTED(parent)) { - if (fname->hinfo.hash != EXT4_DIRENT_HASH(de) || - fname->hinfo.minor_hash != - EXT4_DIRENT_MINOR_HASH(de)) { + /* + * Just checking IS_ENCRYPTED(parent) below is not + * sufficient to decide whether one can use the hash for + * skipping the string comparison, because the key might + * have been added right after + * ext4_fname_setup_ci_filename(). In this case, a hash + * mismatch will be a false negative. Therefore, make + * sure cf_name was properly initialized before + * considering the calculated hash. + */ + if (IS_ENCRYPTED(parent) && fname->cf_name.name && + (fname->hinfo.hash != EXT4_DIRENT_HASH(de) || + fname->hinfo.minor_hash != EXT4_DIRENT_MINOR_HASH(de))) + return false; + /* + * Treat comparison errors as not a match. The + * only case where it happens is on a disk + * corruption or ENOMEM. + */ - return false; - } - } - return !ext4_ci_compare(parent, &fname->cf_name, - de->name, de->name_len, true); - } - return !ext4_ci_compare(parent, fname->usr_fname, de->name, - de->name_len, false); + return generic_ci_match(parent, fname->usr_fname, + &fname->cf_name, de->name, + de->name_len) > 0; } #endif