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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 F19EAC433DF for ; Thu, 4 Jun 2020 13:51:48 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C44B3207D8 for ; Thu, 4 Jun 2020 13:51:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="TG5lWRnU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C44B3207D8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=XXYeD1HP2e19lDj6LbGe+G6oKTJ0tCtXyWvqTyyaq/E=; b=TG5lWRnUSoDzmN eOya9rTiEq6caG90f8nBxlLF9k6DdV/U/aET0x7TKI9HV0QdXk08OP72MAl6arijtwJpSOLJeWVdY VwQRJyPdOci31BRSFS6DbFYHUF8AYf7tYJ9dPbnfefzyoCas7Uhnry2aAZHgOYJ3btg2YDlp6bsTl d/G6Sa9kq8dt2zRK51LPDw2fRGnQozJazg2bYIaOKHriO62686P79VkDBg4dSSE8PGkqxvMmtjeDJ HRHH2z6qWYVs+itO+0azRMfn/Ej26lub6xrFr77V/z8ufKfPvyEPmKlXE2q4EAZujbzTgEwaD70bp /1qfnxo9JZw4h4cgOY0w==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jgqHb-0008Ao-D9; Thu, 04 Jun 2020 13:51:47 +0000 Received: from mail-lj1-f193.google.com ([209.85.208.193]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jgqGr-0007If-P7 for linux-arm-kernel@lists.infradead.org; Thu, 04 Jun 2020 13:51:03 +0000 Received: by mail-lj1-f193.google.com with SMTP id m18so7376084ljo.5 for ; Thu, 04 Jun 2020 06:51:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=bKAdfvJmk5cJtK5g50ZHk8hu9sp158iPwKZPpTWkeYg=; b=BCQLeGvQtXmyl6NZtxSNVn0NeOpYjer460ujS+Pt8h5uX2L5QDEEknlVZ1LkEt1WZv hOEODukptAG7uBpH3IyLagKn0QNSXogaq2EAcUOj4m4DX2IizzGpjGjg2Z8D9jpElAkC 0EVkbdYD30gQLIN19q3GRrEfp+Njq4hN4mqJJnmKBxexQwF7xsOiQnLJ5QKZdSByNFOg bf465iiGu9g5rXzT2CfCot2Z+GTK8NnfyYLwnDMxl56aeem8+SsSPa/SlLi10rcmy+5y 73z9ejCBjrkzjJtNUdztwiXYzO6ZKN4ltAXmwbMOfYpabCLwhgvGIGrsE/5F+8hI/TEL mznQ== X-Gm-Message-State: AOAM533vG+7mhcaxGTWmee1AG3ra5ogKvegSK12S8oQRObOZC+WasBsL DilKCoWkPaHNJXMpWAdwVCU= X-Google-Smtp-Source: ABdhPJyaEJiFG1nukoZekZitzyjRXSvRiSbJSp8S8jS/4CPjpOJZ15oCqdnMtSvYh0QGwlrPyIn8nA== X-Received: by 2002:a2e:9917:: with SMTP id v23mr2338833lji.225.1591278660052; Thu, 04 Jun 2020 06:51:00 -0700 (PDT) Received: from localhost.localdomain ([185.248.161.177]) by smtp.gmail.com with ESMTPSA id u16sm1202140lji.58.2020.06.04.06.50.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Jun 2020 06:50:59 -0700 (PDT) From: Alexander Popov To: Kees Cook , Emese Revfy , Miguel Ojeda , Masahiro Yamada , Michal Marek , Andrew Morton , Masahiro Yamada , Thiago Jung Bauermann , Luis Chamberlain , Jessica Yu , Sven Schnelle , Iurii Zaikin , Catalin Marinas , Will Deacon , Vincenzo Frascino , Thomas Gleixner , Peter Collingbourne , Naohiro Aota , Alexander Monakov , Mathias Krause , PaX Team , Brad Spengler , Laura Abbott , Florian Weimer , Alexander Popov , kernel-hardening@lists.openwall.com, linux-kbuild@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, gcc@gcc.gnu.org Subject: [PATCH 3/5] gcc-plugins/stackleak: Add 'verbose' plugin parameter Date: Thu, 4 Jun 2020 16:49:55 +0300 Message-Id: <20200604134957.505389-4-alex.popov@linux.com> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200604134957.505389-1-alex.popov@linux.com> References: <20200604134957.505389-1-alex.popov@linux.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200604_065102_012031_0CDC947C X-CRM114-Status: GOOD ( 16.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: notify@kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add 'verbose' plugin parameter for stackleak gcc plugin. It can be used for printing additional info about the kernel code instrumentation. For using it add the following to scripts/Makefile.gcc-plugins: gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STACKLEAK) \ += -fplugin-arg-stackleak_plugin-verbose Signed-off-by: Alexander Popov --- scripts/gcc-plugins/stackleak_plugin.c | 31 +++++++++++++++++++++----- 1 file changed, 26 insertions(+), 5 deletions(-) diff --git a/scripts/gcc-plugins/stackleak_plugin.c b/scripts/gcc-plugins/stackleak_plugin.c index 0769c5b9156d..19358712d4ed 100644 --- a/scripts/gcc-plugins/stackleak_plugin.c +++ b/scripts/gcc-plugins/stackleak_plugin.c @@ -33,6 +33,8 @@ __visible int plugin_is_GPL_compatible; static int track_frame_size = -1; static bool build_for_x86 = false; static const char track_function[] = "stackleak_track_stack"; +static bool disable = false; +static bool verbose = false; /* * Mark these global variables (roots) for gcc garbage collector since @@ -45,6 +47,7 @@ static struct plugin_info stackleak_plugin_info = { .help = "track-min-size=nn\ttrack stack for functions with a stack frame size >= nn bytes\n" "arch=target_arch\tspecify target build arch\n" "disable\t\tdo not activate the plugin\n" + "verbose\t\tprint info about the instrumentation\n" }; static void add_stack_tracking_gcall(gimple_stmt_iterator *gsi) @@ -98,6 +101,10 @@ static tree get_current_stack_pointer_decl(void) return var; } + if (verbose) { + fprintf(stderr, "stackleak: missing current_stack_pointer in %s()\n", + DECL_NAME_POINTER(current_function_decl)); + } return NULL_TREE; } @@ -366,6 +373,7 @@ static bool remove_stack_tracking_gasm(void) */ static unsigned int stackleak_cleanup_execute(void) { + const char *fn = DECL_NAME_POINTER(current_function_decl); bool removed = false; /* @@ -376,11 +384,17 @@ static unsigned int stackleak_cleanup_execute(void) * For more info see gcc commit 7072df0aae0c59ae437e. * Let's leave such functions instrumented. */ - if (cfun->calls_alloca) + if (cfun->calls_alloca) { + if (verbose) + fprintf(stderr, "stackleak: instrument %s() old\n", fn); return 0; + } - if (large_stack_frame()) + if (large_stack_frame()) { + if (verbose) + fprintf(stderr, "stackleak: instrument %s()\n", fn); return 0; + } if (lookup_attribute_spec(get_identifier("no_caller_saved_registers"))) removed = remove_stack_tracking_gasm(); @@ -506,9 +520,6 @@ __visible int plugin_init(struct plugin_name_args *plugin_info, /* Parse the plugin arguments */ for (i = 0; i < argc; i++) { - if (!strcmp(argv[i].key, "disable")) - return 0; - if (!strcmp(argv[i].key, "track-min-size")) { if (!argv[i].value) { error(G_("no value supplied for option '-fplugin-arg-%s-%s'"), @@ -531,6 +542,10 @@ __visible int plugin_init(struct plugin_name_args *plugin_info, if (!strcmp(argv[i].value, "x86")) build_for_x86 = true; + } else if (!strcmp(argv[i].key, "disable")) { + disable = true; + } else if (!strcmp(argv[i].key, "verbose")) { + verbose = true; } else { error(G_("unknown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key); @@ -538,6 +553,12 @@ __visible int plugin_init(struct plugin_name_args *plugin_info, } } + if (disable) { + if (verbose) + fprintf(stderr, "stackleak: disabled for this translation unit\n"); + return 0; + } + /* Give the information about the plugin */ register_callback(plugin_name, PLUGIN_INFO, NULL, &stackleak_plugin_info); -- 2.25.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel