From patchwork Tue Sep 29 21:46:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11807209 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 ADD5E139F for ; Tue, 29 Sep 2020 21:51:07 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id F102620848 for ; Tue, 29 Sep 2020 21:51:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="jWS8iUHI" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F102620848 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-20058-patchwork-kernel-hardening=patchwork.kernel.org@lists.openwall.com Received: (qmail 5238 invoked by uid 550); 29 Sep 2020 21:47:50 -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 5132 invoked from network); 29 Sep 2020 21:47:49 -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=YnFARiKS6UDkwdk7WP0wlvbxlnuyKDZd5kTTgvwZzNo=; b=jWS8iUHI1yEZwlx3KeKvcgfGPXNdJ4L5onYlC3CBBL8D7obZFD5GHWOijlDtJb8Ij7 nRmkWkJefVtEgGfyFLejApsO2VFmeAT9vQpKzbQWErmeV2XzN2V7GUaE7Pe9GHYQRqUr Xv61qqqbIr/UD4HQGH+NeCWqUBIaeXjzSEj5haCz3bHxBeyeFilgtE7h3SBO5qI9TeFI VNBOjzf+qN4PzKeK/ip+sm+V/3xF7iAcrvnH3Y+OXfQISp+lvRlaGKxv9Vs2X9cKIOs1 +Egn3AASlwiipmUBXQC2SS1FvIyAuimNGXi91NcEG22l5xpotuSePeSMxIwf0qHe6n0r 39pg== 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=YnFARiKS6UDkwdk7WP0wlvbxlnuyKDZd5kTTgvwZzNo=; b=TxIOiglRDlBwnit/dTRuKOEtfPjVKGOwvn274D0sdnVtD3u8FlCqGUTH0coFhs/npM V+LS7IHr+eAE+kCEsH9eX23LX5Xu7GMDeGpI5CwpmmCz4571xsN0x0y8kRQ6qQR3X8jE WcCniVIWjagn9HRAjTNF40NWzwJB68Q0hPpTAnYqLwMc1vILMc4Wyu+t+kJfHjWJ/Dko GOGIGUI8DYcj78/NzrsR/Q2OSWEUIC2T5I4qGOGQCW7xzZVQ9nc8imZt4WjRnqM4M9iK l0aRyV3W9Bl7o3vQvYlnNRVwYqQU9wzQAa7Yfk31gZSLE0kdeyNPu+xs9LLzWV90u4bg 49mg== X-Gm-Message-State: AOAM532ce9Oox0gtofqzVbTI2MrGFS7QnjovoRrA3EOfrf7tSfaulLzi 39Mzgu9ycGLAyYOpisHXbv0IZ8PF0Dd2IBjyb44= X-Google-Smtp-Source: ABdhPJxYhSRNOkwgDRc/l2C7Jl258wmN5ml/1qkiBHZtQEnR2mVC77q0+39UpprEXaMpqtbM+otlfoYoA23IDmqOt+I= 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:a25:ae9f:: with SMTP id b31mr8477359ybj.437.1601416057863; Tue, 29 Sep 2020 14:47:37 -0700 (PDT) Date: Tue, 29 Sep 2020 14:46:30 -0700 In-Reply-To: <20200929214631.3516445-1-samitolvanen@google.com> Message-Id: <20200929214631.3516445-29-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 28/29] x86, cpu: disable LTO for cpu.c 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 Clang incorrectly inlines functions with differing stack protector attributes, which breaks __restore_processor_state() that relies on stack protector being disabled. This change disables LTO for cpu.c to work aroung the bug. Link: https://bugs.llvm.org/show_bug.cgi?id=47479 Suggested-by: Nick Desaulniers Signed-off-by: Sami Tolvanen --- arch/x86/power/Makefile | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/power/Makefile b/arch/x86/power/Makefile index 6907b523e856..5f711a441623 100644 --- a/arch/x86/power/Makefile +++ b/arch/x86/power/Makefile @@ -5,5 +5,9 @@ OBJECT_FILES_NON_STANDARD_hibernate_asm_$(BITS).o := y # itself be stack-protected CFLAGS_cpu.o := -fno-stack-protector +# Clang may incorrectly inline functions with stack protector enabled into +# __restore_processor_state(): https://bugs.llvm.org/show_bug.cgi?id=47479 +CFLAGS_REMOVE_cpu.o := $(CC_FLAGS_LTO) + obj-$(CONFIG_PM_SLEEP) += cpu.o obj-$(CONFIG_HIBERNATION) += hibernate_$(BITS).o hibernate_asm_$(BITS).o hibernate.o