From patchwork Tue Jun 20 20:35:49 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 9800229 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C2933600F5 for ; Tue, 20 Jun 2017 20:38:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B3FE91FF21 for ; Tue, 20 Jun 2017 20:38:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A87AE284FC; Tue, 20 Jun 2017 20:38:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id 522AF1FF21 for ; Tue, 20 Jun 2017 20:38:29 +0000 (UTC) Received: (qmail 32273 invoked by uid 550); 20 Jun 2017 20:38:28 -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 Delivered-To: moderator for kernel-hardening@lists.openwall.com Received: (qmail 30516 invoked from network); 20 Jun 2017 20:36:06 -0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=s93LixPW2VcxQrThrzLQ3YwmfgRXKrBc/cucHk3E1lo=; b=pC/aSTOUoG+I+51WVliSdelhA 1igmycKTviqNGU9cD67WwFdZC5/wQ/Bdg7jqnlZDiP6ou9iY6u2uDGRhckPsUt4bNFAbpk8GmpyE+ xYAF7MOr0PybtHz6YF5jUlR3Fe2bjfjxJqDXFaP93VrhiC6/lKwmZvRtcodGqP9sgo7U848RtopPX 56kWeLUwHTFT8n3hbrntu0ttHxrKEANJ5vxZNQSFyL6RYtiPanpd6IU3vc+493Swds4Ge0VK1tVHv aMTAzEdqGtNTO/jH7E+NISKK1Dm+eORJ3EOLUIoNeEPVxKkn097wMBPumaOnkp5nFs/UAqA3LHb3A LC6lqJmlw==; Date: Tue, 20 Jun 2017 13:35:49 -0700 From: Christoph Hellwig To: Kees Cook Cc: Christoph Hellwig , "kernel-hardening@lists.openwall.com" , LKML , "Rafael J. Wysocki" , Len Brown , linux-acpi@vger.kernel.org, Linus Torvalds Message-ID: <20170620203549.GA4049@infradead.org> References: <1497905801-69164-1-git-send-email-keescook@chromium.org> <1497905801-69164-4-git-send-email-keescook@chromium.org> <20170620065631.GA25354@infradead.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.8.0 (2017-02-23) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Subject: [kernel-hardening] Re: [PATCH 3/4] randstruct: Disable randomization of ACPICA structs X-Virus-Scanned: ClamAV using ClamSMTP On Tue, Jun 20, 2017 at 12:25:53PM -0700, Kees Cook wrote: > Can you send the patch to https://github.com/acpica/acpica ? My change > was finally accepted, so this whole issue will go away on the next > refresh. Until then, I don't want to block the entire automatic > structure selection logic of randstruct on a three-function table. :) I do not have a github account and no such thing is required for kernel development. I've already CCed the ACPI maintainer the last time I sent the patch, and I would much prefer if they'd just include it to play silly games. Ccing them and Linus once again to sort this process mess out. > Given that it's a tiny exclusion for randstruct, and there is already > a path in motion to fix it, I think this patch is trivial and > sufficient. But it's pointless - just do the right thing. --- From e8046f6507c2ed60bc501a0c0caa5a3f15f5e3e4 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 28 May 2017 09:53:45 +0300 Subject: acpi: get rid of acpi_sleep_dispatch No need for the array of structs of function pointers when we can just call the handfull of functions directly. This could be further cleaned up if acpi_gbl_reduced_hardware was defined true in the ACPI_REDUCED_HARDWARE case, but that's material for the next round. Signed-off-by: Christoph Hellwig --- drivers/acpi/acpica/hwxfsleep.c | 89 +++++++++-------------------------------- include/acpi/actypes.h | 9 ----- 2 files changed, 18 insertions(+), 80 deletions(-) diff --git a/drivers/acpi/acpica/hwxfsleep.c b/drivers/acpi/acpica/hwxfsleep.c index 5733b1167e46..66fa3ebddd57 100644 --- a/drivers/acpi/acpica/hwxfsleep.c +++ b/drivers/acpi/acpica/hwxfsleep.c @@ -57,26 +57,6 @@ acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs, acpi_physical_address physical_address64); #endif -static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id); - -/* - * Dispatch table used to efficiently branch to the various sleep - * functions. - */ -#define ACPI_SLEEP_FUNCTION_ID 0 -#define ACPI_WAKE_PREP_FUNCTION_ID 1 -#define ACPI_WAKE_FUNCTION_ID 2 - -/* Legacy functions are optional, based upon ACPI_REDUCED_HARDWARE */ - -static struct acpi_sleep_functions acpi_sleep_dispatch[] = { - {ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_sleep), - acpi_hw_extended_sleep}, - {ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake_prep), - acpi_hw_extended_wake_prep}, - {ACPI_HW_OPTIONAL_FUNCTION(acpi_hw_legacy_wake), acpi_hw_extended_wake} -}; - /* * These functions are removed for the ACPI_REDUCED_HARDWARE case: * acpi_set_firmware_waking_vector @@ -236,53 +216,6 @@ acpi_status acpi_enter_sleep_state_s4bios(void) ACPI_EXPORT_SYMBOL(acpi_enter_sleep_state_s4bios) #endif /* !ACPI_REDUCED_HARDWARE */ -/******************************************************************************* - * - * FUNCTION: acpi_hw_sleep_dispatch - * - * PARAMETERS: sleep_state - Which sleep state to enter/exit - * function_id - Sleep, wake_prep, or Wake - * - * RETURN: Status from the invoked sleep handling function. - * - * DESCRIPTION: Dispatch a sleep/wake request to the appropriate handling - * function. - * - ******************************************************************************/ -static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id) -{ - acpi_status status; - struct acpi_sleep_functions *sleep_functions = - &acpi_sleep_dispatch[function_id]; - -#if (!ACPI_REDUCED_HARDWARE) - /* - * If the Hardware Reduced flag is set (from the FADT), we must - * use the extended sleep registers (FADT). Note: As per the ACPI - * specification, these extended registers are to be used for HW-reduced - * platforms only. They are not general-purpose replacements for the - * legacy PM register sleep support. - */ - if (acpi_gbl_reduced_hardware) { - status = sleep_functions->extended_function(sleep_state); - } else { - /* Legacy sleep */ - - status = sleep_functions->legacy_function(sleep_state); - } - - return (status); - -#else - /* - * For the case where reduced-hardware-only code is being generated, - * we know that only the extended sleep registers are available - */ - status = sleep_functions->extended_function(sleep_state); - return (status); - -#endif /* !ACPI_REDUCED_HARDWARE */ -} /******************************************************************************* * @@ -389,7 +322,12 @@ acpi_status acpi_enter_sleep_state(u8 sleep_state) return_ACPI_STATUS(AE_AML_OPERAND_VALUE); } - status = acpi_hw_sleep_dispatch(sleep_state, ACPI_SLEEP_FUNCTION_ID); +#if !ACPI_REDUCED_HARDWARE + if (!acpi_gbl_reduced_hardware) + status = acpi_hw_legacy_sleep(sleep_state); + else +#endif + status = acpi_hw_extended_sleep(sleep_state); return_ACPI_STATUS(status); } @@ -415,8 +353,12 @@ acpi_status acpi_leave_sleep_state_prep(u8 sleep_state) ACPI_FUNCTION_TRACE(acpi_leave_sleep_state_prep); - status = - acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_PREP_FUNCTION_ID); +#if !ACPI_REDUCED_HARDWARE + if (!acpi_gbl_reduced_hardware) + status = acpi_hw_legacy_wake_prep(sleep_state); + else +#endif + status = acpi_hw_extended_wake_prep(sleep_state); return_ACPI_STATUS(status); } @@ -440,7 +382,12 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state) ACPI_FUNCTION_TRACE(acpi_leave_sleep_state); - status = acpi_hw_sleep_dispatch(sleep_state, ACPI_WAKE_FUNCTION_ID); +#if !ACPI_REDUCED_HARDWARE + if (!acpi_gbl_reduced_hardware) + status = acpi_hw_legacy_wake(sleep_state); + else +#endif + status = acpi_hw_extended_wake(sleep_state); return_ACPI_STATUS(status); } diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h index d549e31c6d18..cfcb3abc65b9 100644 --- a/include/acpi/actypes.h +++ b/include/acpi/actypes.h @@ -894,15 +894,6 @@ typedef u8 acpi_adr_space_type; #define ACPI_ENABLE_EVENT 1 #define ACPI_DISABLE_EVENT 0 -/* Sleep function dispatch */ - -typedef acpi_status (*acpi_sleep_function) (u8 sleep_state); - -struct acpi_sleep_functions { - acpi_sleep_function legacy_function; - acpi_sleep_function extended_function; -}; - /* * External ACPI object definition */