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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 80EA1C43381 for ; Wed, 13 Mar 2019 12:28:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4403E21850 for ; Wed, 13 Mar 2019 12:28:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552480089; bh=dohDzF0r0WbehamBz1hsqob3IowgXW1EfSROKvSDp7I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kvXGPXHA2IK0x4W4eAplj+oL2/uKTeo/HjFmSUZSTI1cOHYf/rqwPFTskGc/vcQbd Q0TTWVCRLP+Msvs2fapZ/eEGeZpqaDckOQLn5iTN1IZdszfypGmeS91vDvr9hfcWQo KI0jPHZwDhmT9Qfin/Sm+dNtmoWs0mcpCWFQkxX0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726757AbfCMM2H (ORCPT ); Wed, 13 Mar 2019 08:28:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:41710 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725868AbfCMM2H (ORCPT ); Wed, 13 Mar 2019 08:28:07 -0400 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (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 170812184E; Wed, 13 Mar 2019 12:28:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552480087; bh=dohDzF0r0WbehamBz1hsqob3IowgXW1EfSROKvSDp7I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yVXvTjuXVB/07OtMIXBFW5O/OZg+o49rGUppy2+pvOlJauRT7lyVc8bra8/zaDCjh adGgf+jGxYS9Mel7JI7xHxblw0BXcUcz8hixWhdbI01F4rvBjg7G6jkdpN3qtdySnh 59Ko6vYvkOsCOupFnJs1m0USRsLLJ/h9V91N1Ngs= From: Masami Hiramatsu To: Tom Zanussi , Steven Rostedt Cc: tglx@linutronix.de, mhiramat@kernel.org, namhyung@kernel.org, bigeasy@linutronix.de, joel@joelfernandes.org, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org Subject: [RFC PATCH 3/7] tracing/probe: Check the size of argument name and body Date: Wed, 13 Mar 2019 21:28:02 +0900 Message-Id: <155248008236.10815.8086472136730969529.stgit@devnote2> X-Mailer: git-send-email 2.17.1 In-Reply-To: <155248005229.10815.334731901778152247.stgit@devnote2> References: <155248005229.10815.334731901778152247.stgit@devnote2> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Check the size of argument name and expression is not 0 and smaller than maximum length. Signed-off-by: Masami Hiramatsu --- kernel/trace/trace_probe.c | 2 ++ kernel/trace/trace_probe.h | 1 + 2 files changed, 3 insertions(+) diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index 4cd50913cb5d..feae03056f0b 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -554,6 +554,8 @@ int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg, body = strchr(arg, '='); if (body) { + if (body - arg > MAX_ARG_NAME_LEN || body == arg) + return -EINVAL; parg->name = kmemdup_nul(arg, body - arg, GFP_KERNEL); body++; } else { diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h index 8a63f8bc01bc..2177c206de15 100644 --- a/kernel/trace/trace_probe.h +++ b/kernel/trace/trace_probe.h @@ -32,6 +32,7 @@ #define MAX_TRACE_ARGS 128 #define MAX_ARGSTR_LEN 63 #define MAX_ARRAY_LEN 64 +#define MAX_ARG_NAME_LEN 32 #define MAX_STRING_SIZE PATH_MAX /* Reserved field names */