From patchwork Fri Sep 7 18:19:05 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff King X-Patchwork-Id: 10592467 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6F391112B for ; Fri, 7 Sep 2018 18:19:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 661BF2B3C3 for ; Fri, 7 Sep 2018 18:19:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 59A6A2B3CD; Fri, 7 Sep 2018 18:19:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D73A02B3C3 for ; Fri, 7 Sep 2018 18:19:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727217AbeIGXBP (ORCPT ); Fri, 7 Sep 2018 19:01:15 -0400 Received: from cloud.peff.net ([104.130.231.41]:42914 "HELO cloud.peff.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1726695AbeIGXBP (ORCPT ); Fri, 7 Sep 2018 19:01:15 -0400 Received: (qmail 24472 invoked by uid 109); 7 Sep 2018 18:19:08 -0000 Received: from Unknown (HELO peff.net) (10.0.1.2) by cloud.peff.net (qpsmtpd/0.94) with SMTP; Fri, 07 Sep 2018 18:19:08 +0000 Authentication-Results: cloud.peff.net; auth=none Received: (qmail 15801 invoked by uid 111); 7 Sep 2018 18:19:19 -0000 Received: from sigill.intra.peff.net (HELO sigill.intra.peff.net) (10.0.0.7) by peff.net (qpsmtpd/0.94) with (ECDHE-RSA-AES256-GCM-SHA384 encrypted) SMTP; Fri, 07 Sep 2018 14:19:19 -0400 Authentication-Results: peff.net; auth=none Received: by sigill.intra.peff.net (sSMTP sendmail emulation); Fri, 07 Sep 2018 14:19:05 -0400 Date: Fri, 7 Sep 2018 14:19:05 -0400 From: Jeff King To: git@vger.kernel.org Subject: [PATCH] config.mak.dev: add -Wformat-security Message-ID: <20180907181905.GA15897@sigill.intra.peff.net> MIME-Version: 1.0 Content-Disposition: inline Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We currently build cleanly with -Wformat-security, and it's a good idea to make sure we continue to do so (since calls that trigger the warning may be security vulnerabilities). Note that we cannot use the stronger -Wformat-nonliteral, as there are case where we are clever with passing around pointers to string literals. E.g., bisect_rev_setup() takes bad_format and good_format parameters. These ultimately come from literals, but they still trigger the warning. Some of these might be fixable (e.g., by passing flags from which we locally select a format), and might even be worth fixing (not because of security, but just because it's an easy mistake to pass the wrong format). But there are other cases which are likely quite hard to fix (we actually generate formats in a local buffer in some cases). So let's punt on that for now and start with -Wformat-security, which is supposed to catch the most important cases. Signed-off-by: Jeff King --- config.mak.dev | 1 + 1 file changed, 1 insertion(+) diff --git a/config.mak.dev b/config.mak.dev index 9a998149d9..f832752454 100644 --- a/config.mak.dev +++ b/config.mak.dev @@ -14,6 +14,7 @@ CFLAGS += -Wpointer-arith CFLAGS += -Wstrict-prototypes CFLAGS += -Wunused CFLAGS += -Wvla +CFLAGS += -Wformat-security ifndef COMPILER_FEATURES COMPILER_FEATURES := $(shell ./detect-compiler $(CC))