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=-5.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, T_DKIMWL_WL_HIGH,URIBL_BLOCKED,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 04707C04A6B for ; Mon, 6 May 2019 14:47:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CC376205ED for ; Mon, 6 May 2019 14:47:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557154050; bh=/ZxRE3RAVL8mwAUldM3RlQTp0XqIDm8i6fAL3dQuQdU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=uKD1xk/Zs2L9bf7kKtSZxRDIJorvD7q0M/BVnxoovwNQBEAI+Xaey+lq3LUIDGcW8 EpTUB5S4pFQUH9kMgQoZd8B+T0UzagwptgLjxWXZPeJNWzdTUsilVIL0buMZgcOp/C ZaTJqjwql/IMLa/cHlKvoC6wx7ufLAHzO5tpLA1w= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729310AbfEFOr3 (ORCPT ); Mon, 6 May 2019 10:47:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:46592 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728369AbfEFOr0 (ORCPT ); Mon, 6 May 2019 10:47:26 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 58A4020578; Mon, 6 May 2019 14:47:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557154045; bh=/ZxRE3RAVL8mwAUldM3RlQTp0XqIDm8i6fAL3dQuQdU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bPdv6O/u1R/TMq4a4aapQWN9a7rzJz1dPNem7tCbgSbnqas54ERLIecfwuUuhdR/d IZvyIksUAVgiBJhxlFYrFuiaOC9Kpc1Fk6plAN4VsovksXVK6F/8uTUTt3rvPS7sK2 nEX/wgvtu1xyLT0bPfchRAlwEvTog0P4ALAbbGgI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrey Konovalov , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Geert Uytterhoeven , Nick Terrell , Chris Mason , Yury Norov , Al Viro , "Luis R . Rodriguez" , Palmer Dabbelt , "Paul E . McKenney" , Jeff Layton , "Jason A . Donenfeld" , Kostya Serebryany , Andrew Morton , Linus Torvalds Subject: [PATCH 4.9 18/62] kasan: prevent compiler from optimizing away memset in tests Date: Mon, 6 May 2019 16:32:49 +0200 Message-Id: <20190506143052.648187716@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190506143051.102535767@linuxfoundation.org> References: <20190506143051.102535767@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andrey Konovalov commit 69ca372c100fba99c78ef826a1795aa86e4f01a8 upstream. A compiler can optimize away memset calls by replacing them with mov instructions. There are KASAN tests that specifically test that KASAN correctly handles memset calls so we don't want this optimization to happen. The solution is to add -fno-builtin flag to test_kasan.ko Link: http://lkml.kernel.org/r/105ec9a308b2abedb1a0d1fdced0c22d765e4732.1519924383.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov Acked-by: Andrey Ryabinin Cc: Alexander Potapenko Cc: Dmitry Vyukov Cc: Geert Uytterhoeven Cc: Nick Terrell Cc: Chris Mason Cc: Yury Norov Cc: Al Viro Cc: "Luis R . Rodriguez" Cc: Palmer Dabbelt Cc: "Paul E . McKenney" Cc: Jeff Layton Cc: "Jason A . Donenfeld" Cc: Kostya Serebryany Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Andrey Konovalov Signed-off-by: Greg Kroah-Hartman --- lib/Makefile | 1 + 1 file changed, 1 insertion(+) --- a/lib/Makefile +++ b/lib/Makefile @@ -46,6 +46,7 @@ obj-$(CONFIG_TEST_BPF) += test_bpf.o obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o obj-$(CONFIG_TEST_HASH) += test_hash.o obj-$(CONFIG_TEST_KASAN) += test_kasan.o +CFLAGS_test_kasan.o += -fno-builtin obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o obj-$(CONFIG_TEST_LKM) += test_module.o obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o