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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E0176C433EF for ; Thu, 30 Sep 2021 18:06:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C49A460ED7 for ; Thu, 30 Sep 2021 18:06:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353098AbhI3SIH (ORCPT ); Thu, 30 Sep 2021 14:08:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59160 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353168AbhI3SHx (ORCPT ); Thu, 30 Sep 2021 14:07:53 -0400 Received: from mail-qk1-x749.google.com (mail-qk1-x749.google.com [IPv6:2607:f8b0:4864:20::749]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A66F7C061775 for ; Thu, 30 Sep 2021 11:06:06 -0700 (PDT) Received: by mail-qk1-x749.google.com with SMTP id az37-20020a05620a172500b0045e43348ee8so14086725qkb.19 for ; Thu, 30 Sep 2021 11:06:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=QXcVEtkl1ttQdqJQ36Mmw2BuBwRi/4y7WfQWoHeDQYQ=; b=YIvuqa4diHL/KOdonWT+XrXNn6ejbmYGrxpcq6tHonqWDd9wLeV2kwwd7/MnZkZe+o s2KOkSSO2fNwJF71waRq3eGAH4t/zuBbUl+XNk9E9a6TngigsVIeZe5yIU42XiSqwlo8 HQ9xPg9wLyxcZETOfRH6ThiR7EGl9OmCGOW0Fy7NxiJTbRGoINKW6TqXqmjsD6Gjlfn/ 1A8wRMJIuH+s8jB6UrBBIYr1tJxFMfIp51clrm1Ltlh5lxhL31MVFlV8m5jJB1qsC5Bz y30kNX8VS2C21viJCJ3iLc/AywLzChE7HO7BQ8g0EW657HJlc44Icfo9Td2j2D5Ps4vu t4eg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=QXcVEtkl1ttQdqJQ36Mmw2BuBwRi/4y7WfQWoHeDQYQ=; b=o3LLjwIogTlAIJBIjR6QfgiJEIEu6SWtJNHQincNTpFPYTU7aGK7rqeLW4kEdyjDgr 6tjSt0t65rZj6VfV1da9WMGixrNBSUr3FI693jUaPRlvOzz38BzqAg47hyXxJYyrToby t7bUF3ZS79Fw40tqnYSwX/ehn+rgO+k/XwJpL0J5msk4UQ2Hy/ZZ6/XunqR5qA625Ptc YhbKPnw/QT+IaVcgt+Jgm7Cv+tGLv5yCjvTdgl/F+9GlvDj4NjucYkpgNt0VkaaTUYQ3 ePngHYeI0vYxkSOh1UxOiXYtJZGJ8j503+dY+6Da2ns+S8qWckvLEyuGlowN6m4/GnOW Rr+Q== X-Gm-Message-State: AOAM530afURR0gDfz6WFWRsQaY9zBwxLOEyUAtXBbIcPwnq0skFAy0/5 dirgLs60NS8YlfELYM4j18IKnDu3I1mX2idV1eM= X-Google-Smtp-Source: ABdhPJwOEaXh89+R/H7MBRz5M9c3ZhPc6Z/jeTX/U7qPBoq+FlxU6J4n+Dxg9mzNIkwXfswiN5kgdhWujNpQQLRVsnA= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:ce43:4366:95ca:d6e9]) (user=samitolvanen job=sendgmr) by 2002:a05:6214:122e:: with SMTP id p14mr6685928qvv.37.1633025165880; Thu, 30 Sep 2021 11:06:05 -0700 (PDT) Date: Thu, 30 Sep 2021 11:05:29 -0700 In-Reply-To: <20210930180531.1190642-1-samitolvanen@google.com> Message-Id: <20210930180531.1190642-14-samitolvanen@google.com> Mime-Version: 1.0 References: <20210930180531.1190642-1-samitolvanen@google.com> X-Mailer: git-send-email 2.33.0.800.g4c38ced690-goog Subject: [PATCH v4 13/15] x86, cpu: Use LTO for cpu.c with CFI From: Sami Tolvanen To: x86@kernel.org Cc: Kees Cook , Josh Poimboeuf , Peter Zijlstra , Nathan Chancellor , Nick Desaulniers , Sedat Dilek , linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Allow LTO to be used for cpu.c when CONFIG_CFI_CLANG is enabled to avoid indirect call failures. CFI requires Clang >= 13, which doesn't have the stack protector inlining bug. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook Reviewed-by: Nick Desaulniers --- arch/x86/power/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/power/Makefile b/arch/x86/power/Makefile index 379777572bc9..a0532851fed7 100644 --- a/arch/x86/power/Makefile +++ b/arch/x86/power/Makefile @@ -4,9 +4,11 @@ # itself be stack-protected CFLAGS_cpu.o := -fno-stack-protector +ifndef CONFIG_CFI_CLANG # 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 := $(CC_FLAGS_LTO) +endif obj-$(CONFIG_PM_SLEEP) += cpu.o obj-$(CONFIG_HIBERNATION) += hibernate_$(BITS).o hibernate_asm_$(BITS).o hibernate.o -- 2.33.0.800.g4c38ced690-goog