From patchwork Tue Dec 1 21:37:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11943949 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=-26.2 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 41492C8302A for ; Tue, 1 Dec 2020 21:39:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D2A71208DB for ; Tue, 1 Dec 2020 21:39:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="vXHUajvU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389934AbgLAVj2 (ORCPT ); Tue, 1 Dec 2020 16:39:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56462 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389855AbgLAVj1 (ORCPT ); Tue, 1 Dec 2020 16:39:27 -0500 Received: from mail-qv1-xf4a.google.com (mail-qv1-xf4a.google.com [IPv6:2607:f8b0:4864:20::f4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 32D38C09425C for ; Tue, 1 Dec 2020 13:37:43 -0800 (PST) Received: by mail-qv1-xf4a.google.com with SMTP id b15so2199127qvm.10 for ; Tue, 01 Dec 2020 13:37:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=aPTc8wYkBIIZS9XLhaJqPHrVGew/rHRzWtLqs6SwnEk=; b=vXHUajvUgn40LQCYOvZPKvqCWjM82atINdDHUGd5EhIZaxvZWNECR6Puf1wV/Xm1fz RZFUluVJoen54/2OkeSIKDLooJAqo6nO6jmid/KnIY+pQsB0jUK1FLQCjzUfvDCGjqfW 5DsweDMH7mPM+webX4KoPPbT06j0wd8ib/BAqCtFcLiXN9fRxFfzVzezsrV61oCpnhyb 7uduG6UItD7EnvVpEffELx2wbLPqlD3Oqd6UlZIDNGhgDg+wEFbzFvokQCivtnRsGs7N 92Et/EOjPux1Tii1bL3i8/gTtmbaMJpflMTGhVRAPssOG6ib3nwdVtng5zkY0hoNy4H7 BGdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=aPTc8wYkBIIZS9XLhaJqPHrVGew/rHRzWtLqs6SwnEk=; b=ctyDnAfTMQsE9Z/HZ6p+k7xq5QEl4IR9MCwsUHbChiU9cnm3qxxQem+JL6aQdNJpu+ ZNIQyXDG7hEm9vr0ffhViGDGFduiAhlIgbTxKX4zdstXacG+2igRVDF99gJS9YsGaqk+ Ni2KIdOX+mqb3lVDHMKiO1l3SD9qfz3ibMjazZZg8FlvvFconKOsDktqauyo93djExfR Dx8ZiW3K9wkbh+yeJuCmKYMgL8sSgLGyQ+cA5RwNuOIn9x+0FA8uthgbgD7yO9QrUtcG T6RPfSbdb7c7kS6vEYGElqj1Vk15jXPT45QsVkm4nnNzpO80vOLRYyasDjvmn3GW23vA N9Ow== X-Gm-Message-State: AOAM532Boo5d8z5VTExFBibN3Lu+Gnmpri2MuUGtOww2TEmeAB4pK6B1 AF+T/fNxPPcX3o5RNo5eUpkV+PNF6Ueoe13ToOQ= X-Google-Smtp-Source: ABdhPJx2UMQKvzPc9YbjuAcaOdZsXhK7RlcIM2M9pkfdRpnDBi+U9k28DqELenlSlo2tvxUYIND8c9jWK0Acmjv4ppQ= Sender: "samitolvanen via sendgmr" X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:ad4:5685:: with SMTP id bc5mr5091015qvb.48.1606858662372; Tue, 01 Dec 2020 13:37:42 -0800 (PST) Date: Tue, 1 Dec 2020 13:37:04 -0800 In-Reply-To: <20201201213707.541432-1-samitolvanen@google.com> Message-Id: <20201201213707.541432-14-samitolvanen@google.com> Mime-Version: 1.0 References: <20201201213707.541432-1-samitolvanen@google.com> X-Mailer: git-send-email 2.29.2.576.ga3fc446d84-goog Subject: [PATCH v8 13/16] drivers/misc/lkdtm: disable LTO for rodata.o From: Sami Tolvanen To: Masahiro Yamada , Steven Rostedt , Will Deacon Cc: Josh Poimboeuf , Peter Zijlstra , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Sami Tolvanen Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Disable LTO for rodata.o to allow objcopy to be used to manipulate sections. Signed-off-by: Sami Tolvanen Acked-by: Kees Cook --- drivers/misc/lkdtm/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/misc/lkdtm/Makefile b/drivers/misc/lkdtm/Makefile index c70b3822013f..dd4c936d4d73 100644 --- a/drivers/misc/lkdtm/Makefile +++ b/drivers/misc/lkdtm/Makefile @@ -13,6 +13,7 @@ lkdtm-$(CONFIG_LKDTM) += cfi.o KASAN_SANITIZE_stackleak.o := n KCOV_INSTRUMENT_rodata.o := n +CFLAGS_REMOVE_rodata.o += $(CC_FLAGS_LTO) OBJCOPYFLAGS := OBJCOPYFLAGS_rodata_objcopy.o := \