From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@kernel.org>
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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH,
	DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 EFD70C433E6
	for <linux-kernel@archiver.kernel.org>; Mon, 21 Dec 2020 21:45:34 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by mail.kernel.org (Postfix) with ESMTP id AE126224F9
	for <linux-kernel@archiver.kernel.org>; Mon, 21 Dec 2020 21:45:34 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1726546AbgLUVpV (ORCPT
        <rfc822;linux-kernel@archiver.kernel.org>);
        Mon, 21 Dec 2020 16:45:21 -0500
Received: from mail.kernel.org ([198.145.29.99]:58448 "EHLO mail.kernel.org"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1726429AbgLUVpV (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 21 Dec 2020 16:45:21 -0500
Received: from localhost.localdomain (c-73-209-127-30.hsd1.il.comcast.net [73.209.127.30])
        (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 3676522A83;
        Mon, 21 Dec 2020 21:44:39 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;
        s=k20201202; t=1608587079;
        bh=/qy0bM+j5hZZjQJEtULv2eJetkKOH0uuUlk0fFjXFtg=;
        h=From:To:Cc:Subject:Date:In-Reply-To:References:In-Reply-To:
         References:From;
        b=V5NVIqB8LAivDtoob0nsCMF9rvm/WjYSlyvKVBo9g2LfZ9pboGuhtAjxawnYxNeN4
         8mVZG26nsRwgM7McTpwOI+UBGM0gjgk4RZVX969+obILrrQls+C2/R4MQUXym4UgWW
         fGBG0v4P4rVYqql5wbNfjDKAcHXRahW6nqjN058X2RMrlK8b0fVQubbx9GeccRcibK
         ZsSkHxNB3CgNNiaYLksWq/ntt/E5hM4ms4c+Y7ZMH2RQZR7u3+HS6UNKuMtgoEinlk
         q6wAk+Wupd8Thc+mbzlm49kmzbZW2wyjqyC3NDpzDR/CBpHe032vqCpxvt3BPh74w9
         /swZNgerTWGxA==
From:   Tom Zanussi <zanussi@kernel.org>
To:     rostedt@goodmis.org, axelrasmussen@google.com
Cc:     mhiramat@kernel.org, dan.carpenter@oracle.com,
        linux-kernel@vger.kernel.org
Subject: [PATCH v5 3/5] tracing: Update synth command errors
Date:   Mon, 21 Dec 2020 15:44:29 -0600
Message-Id: <9c6f559ff46b597312509974a3546e82fdc0907f.1608586464.git.zanussi@kernel.org>
X-Mailer: git-send-email 2.17.1
In-Reply-To: <cover.1608586464.git.zanussi@kernel.org>
References: <cover.1608586464.git.zanussi@kernel.org>
In-Reply-To: <cover.1608586464.git.zanussi@kernel.org>
References: <cover.1608586464.git.zanussi@kernel.org>
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Since array types are handled differently, errors referencing them
also need to be handled differently.  Add and use a new
INVALID_ARRAY_SPEC error.  Also add INVALID_CMD and INVALID_DYN_CMD to
catch and display the correct form for badly-formed commands, which
can also be used in place of CMD_INCOMPLETE, which is removed, and
remove CMD_TOO_LONG, since it's no longer used.

Signed-off-by: Tom Zanussi <zanussi@kernel.org>
---
 kernel/trace/trace_events_synth.c | 71 +++++++++++++++++++++++++++----
 1 file changed, 63 insertions(+), 8 deletions(-)

diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c
index 66ccbab3483b..2a9c8bf74bb2 100644
--- a/kernel/trace/trace_events_synth.c
+++ b/kernel/trace/trace_events_synth.c
@@ -23,13 +23,14 @@
 #undef ERRORS
 #define ERRORS	\
 	C(BAD_NAME,		"Illegal name"),		\
-	C(CMD_INCOMPLETE,	"Incomplete command"),		\
+	C(INVALID_CMD,		"Command must be of the form: <name> field[;field] ..."),\
+	C(INVALID_DYN_CMD,	"Command must be of the form: s or -:[synthetic/]<name> field[;field] ..."),\
 	C(EVENT_EXISTS,		"Event already exists"),	\
 	C(TOO_MANY_FIELDS,	"Too many fields"),		\
 	C(INCOMPLETE_TYPE,	"Incomplete type"),		\
 	C(INVALID_TYPE,		"Invalid type"),		\
-	C(INVALID_FIELD,	"Invalid field"),		\
-	C(CMD_TOO_LONG,		"Command too long"),
+	C(INVALID_FIELD,        "Invalid field"),		\
+	C(INVALID_ARRAY_SPEC,	"Invalid array specification"),
 
 #undef C
 #define C(a, b)		SYNTH_ERR_##a
@@ -651,6 +652,10 @@ static struct synth_field *parse_synth_field(int argc, char **argv,
 
 	size = synth_field_size(field->type);
 	if (size < 0) {
+		if (array)
+			synth_err(SYNTH_ERR_INVALID_ARRAY_SPEC, errpos(field_name));
+		else
+			synth_err(SYNTH_ERR_INVALID_TYPE, errpos(field_type));
 		ret = -EINVAL;
 		goto free;
 	} else if (size == 0) {
@@ -1171,7 +1176,7 @@ static int __create_synth_event(const char *name, const char *raw_fields)
 	mutex_lock(&event_mutex);
 
 	if (name[0] == '\0') {
-		synth_err(SYNTH_ERR_CMD_INCOMPLETE, 0);
+		synth_err(SYNTH_ERR_INVALID_CMD, 0);
 		ret = -EINVAL;
 		goto out;
 	}
@@ -1221,6 +1226,7 @@ static int __create_synth_event(const char *name, const char *raw_fields)
 		argv_free(argv);
 
 		if (consumed < argc) {
+			synth_err(SYNTH_ERR_INVALID_CMD, 0);
 			ret = -EINVAL;
 			goto err;
 		}
@@ -1229,7 +1235,7 @@ static int __create_synth_event(const char *name, const char *raw_fields)
 	}
 
 	if (n_fields == 0) {
-		synth_err(SYNTH_ERR_CMD_INCOMPLETE, 0);
+		synth_err(SYNTH_ERR_INVALID_CMD, 0);
 		ret = -EINVAL;
 		goto err;
 	}
@@ -1367,6 +1373,37 @@ int synth_event_delete(const char *event_name)
 }
 EXPORT_SYMBOL_GPL(synth_event_delete);
 
+static int check_command(const char *raw_command)
+{
+	char **argv = NULL, *cmd, *saved_cmd, *name_and_field;
+	int argc, ret = 0;
+
+	cmd = saved_cmd = kstrdup(raw_command, GFP_KERNEL);
+	if (!cmd)
+		return -ENOMEM;
+
+	name_and_field = strsep(&cmd, ";");
+	if (!name_and_field) {
+		ret = -EINVAL;
+		goto free;
+	}
+
+	argv = argv_split(GFP_KERNEL, name_and_field, &argc);
+	if (!argv) {
+		ret = -ENOMEM;
+		goto free;
+	}
+
+	if (argc < 3)
+		ret = -EINVAL;
+free:
+	kfree(saved_cmd);
+	if (argv)
+		argv_free(argv);
+
+	return ret;
+}
+
 static int create_or_delete_synth_event(const char *raw_command)
 {
 	char *name = NULL, *fields, *p;
@@ -1378,9 +1415,17 @@ static int create_or_delete_synth_event(const char *raw_command)
 
 	last_cmd_set(raw_command);
 
+	ret = check_command(raw_command);
+	if (ret) {
+		synth_err(SYNTH_ERR_INVALID_CMD, 0);
+		return ret;
+	}
+
 	p = strpbrk(raw_command, " \t");
-	if (!p)
+	if (!p) {
+		synth_err(SYNTH_ERR_INVALID_CMD, 0);
 		return -EINVAL;
+	}
 
 	name = kmemdup_nul(raw_command, p - raw_command, GFP_KERNEL);
 	if (!name)
@@ -1954,8 +1999,10 @@ static int create_synth_event(const char *raw_command)
 	last_cmd_set(raw_command);
 
 	p = strpbrk(raw_command, " \t");
-	if (!p)
+	if (!p) {
+		synth_err(SYNTH_ERR_INVALID_CMD, 0);
 		return -EINVAL;
+	}
 
 	fields = skip_spaces(p);
 
@@ -1968,13 +2015,21 @@ static int create_synth_event(const char *raw_command)
 	/* This interface accepts group name prefix */
 	if (strchr(name, '/')) {
 		len = str_has_prefix(name, SYNTH_SYSTEM "/");
-		if (len == 0)
+		if (len == 0) {
+			synth_err(SYNTH_ERR_INVALID_DYN_CMD, 0);
 			return -EINVAL;
+		}
 		name += len;
 	}
 
 	len = name - raw_command;
 
+	ret = check_command(raw_command + len);
+	if (ret) {
+		synth_err(SYNTH_ERR_INVALID_CMD, 0);
+		return ret;
+	}
+
 	name = kmemdup_nul(raw_command + len, p - raw_command - len, GFP_KERNEL);
 	if (!name)
 		return -ENOMEM;
-- 
2.17.1