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: 11807199 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 F30B913B2 for ; Tue, 29 Sep 2020 21:50:32 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 409CA2076D for ; Tue, 29 Sep 2020 21:50:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="jeIjKmg7" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 409CA2076D Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-20054-patchwork-kernel-hardening=patchwork.kernel.org@lists.openwall.com Received: (qmail 3156 invoked by uid 550); 29 Sep 2020 21:47:40 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 2012 invoked from network); 29 Sep 2020 21:47:40 -0000 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=gyXC+wUTMXGeMQLXkr2dfG3n6aChQ3ePKEuIT9AjQa93s94bH3etQvk/7fMkWdydlY uWnzGFnX7vLbvU7wcS5WDGoJy4+ZpT4mNSTzXS5RotXZIvUeECA8cd3n8O/bAWgtbEYI hw34qWqO16/lWo8p3xNadlzxClMSpTgaGJrvJxib93xyOU0jNLnW7FouFir4iQy7XsqT GdDa/LC+PopZ2fYEQPu8ddvPX4RNjHQxMbt/QhISrbCPcFaE0V7oQimAM+OLAKEmtLFB uGisCM2dK/9Vn4CfxEenPw5a4QGiIe5ZnflG4KPJ1NunUDXHjX4OCPnYrSNehNR2IiX9 9vVg== X-Gm-Message-State: AOAM532OkxSEiMwiRrw+EOquRbGEH/kWPuOR8yihCeEFcxr1M3+jgjjm FBH7FzPsYxgXp7Y0gqA15hsFFrPP/N6CORvV8TU= 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 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