From patchwork Tue Sep 29 21:46:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11807155 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 45E43618 for ; Tue, 29 Sep 2020 21:48:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 26F26208FE for ; Tue, 29 Sep 2020 21:48:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="jeIjKmg7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729254AbgI2Vsu (ORCPT ); Tue, 29 Sep 2020 17:48:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48418 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729191AbgI2Vrp (ORCPT ); Tue, 29 Sep 2020 17:47:45 -0400 Received: from mail-qk1-x74a.google.com (mail-qk1-x74a.google.com [IPv6:2607:f8b0:4864:20::74a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 364B0C0613E3 for ; Tue, 29 Sep 2020 14:47:29 -0700 (PDT) Received: by mail-qk1-x74a.google.com with SMTP id m186so3668572qkf.12 for ; Tue, 29 Sep 2020 14:47:29 -0700 (PDT) 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=DIPWfuOfjnS0FLqqhnzrIZ4jlncEeE+o+vZP3RuRCL0=; b=jeIjKmg7IRS+l/ui8Q+LF8nOaIvlsjsr5dJcnvSqyimVjw+fgPn/vAjJUtO4XmZBa6 Xd0TPg2PXsxw8JWRlXMof9WtQxCvHX0ajUKKZHY+h9ZrQj/vHt4kd3uCJRU76eVTlT3l qvq/mdBiAQCfz0NkdrERe4By8JjkFVxXJhBvXJYakKcsE9Q3uXpA4c2ihpOBil6Arsgm /XRIkE6YivpM0yPirN/ctrfV5AzOopT2G8KpjaFwIzwdIty+tJ9NNd0YLGlPN6mpQHOt PZmo5ltSZAvrWwfyVtCxNb3oLaXN5GzVBEfApucjE1oqsSv0iOxejixTaxe7xLdJuwWh mCjw== 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=DIPWfuOfjnS0FLqqhnzrIZ4jlncEeE+o+vZP3RuRCL0=; b=Ob5CIPK4pQQ0ws6koL6XDJc+o+RBuB2c2BAx109Kyr42LccNIgXXKXad9wSmvWbbTv FYnqSfFnX8x4TuuvLqhzAapn2sDLl5eQ1p1MHz8+oetqFvykMoOwTIKerLokTIg+LYoK UANzv2ypBxzJAuHkCTF3iRSrs0Es3a8Wo+EOepxLb3I4N1XfFd1Hnln1Z4VbbKre1TyH m5wdcaNsntOb4ymIxVoNEr9eFojddXAlZO0yT70PDy4EjSXzts73R3R++GCukGbcJtfC UBRNrMUyA4sgUaGJdp4Bo8o6qTLbhXuJvr/q+sUOu56t/Tf72lu0tqNvt2680PhPh2AR aLVg== X-Gm-Message-State: AOAM532Y7mseK4JIsrUJJ1SmAFFj7FSwenKUGoDxNlz8cdCapj31ZS8W Z2JaxGxkUjpTpNupd0MVYOlac8olaVFlb3dkC88= X-Google-Smtp-Source: ABdhPJxh9cX/NQWJyeaf5NLdRHxlNrjwWH6kgp9BcYdpdAAl3zdkTlK7VGeQKrVU7UdbXnmP9NjmecTJ1e08yzk/vjU= 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:a0c:b308:: with SMTP id s8mr6728794qve.16.1601416048309; Tue, 29 Sep 2020 14:47:28 -0700 (PDT) Date: Tue, 29 Sep 2020 14:46:26 -0700 In-Reply-To: <20200929214631.3516445-1-samitolvanen@google.com> Message-Id: <20200929214631.3516445-25-samitolvanen@google.com> Mime-Version: 1.0 References: <20200929214631.3516445-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.709.gb0816b6eb0-goog Subject: [PATCH v4 24/29] arm64: vdso: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt Cc: 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, x86@kernel.org, Sami Tolvanen Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Disable LTO for the vDSO by filtering out CC_FLAGS_LTO, as there's no point in using link-time optimization for the small about of C code. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- arch/arm64/kernel/vdso/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index e836e300440f..aa47070a3ccf 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -30,7 +30,8 @@ ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \ ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18 ccflags-y += -DDISABLE_BRANCH_PROFILING -CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) +CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) \ + $(CC_FLAGS_LTO) KASAN_SANITIZE := n UBSAN_SANITIZE := n OBJECT_FILES_NON_STANDARD := y