From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:51626 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750861AbdAWQCH (ORCPT ); Mon, 23 Jan 2017 11:02:07 -0500 Subject: Patch "ARM: 8613/1: Fix the uaccess crash on PB11MPCore" has been added to the 4.9-stable tree To: linus.walleij@linaro.org, gregkh@linuxfoundation.org, linux@armlinux.org.uk, narmstrong@baylibre.com, rmk+kernel@arm.linux.org.uk, will.deacon@arm.com Cc: , From: Date: Mon, 23 Jan 2017 17:02:17 +0100 Message-ID: <1485187337219250@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled ARM: 8613/1: Fix the uaccess crash on PB11MPCore to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm-8613-1-fix-the-uaccess-crash-on-pb11mpcore.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 90f92c631b210c1e97080b53a9d863783281a932 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Tue, 13 Sep 2016 12:31:17 +0100 Subject: ARM: 8613/1: Fix the uaccess crash on PB11MPCore From: Linus Walleij commit 90f92c631b210c1e97080b53a9d863783281a932 upstream. The following patch was sketched by Russell in response to my crashes on the PB11MPCore after the patch for software-based priviledged no access support for ARMv8.1. See this thread: http://marc.info/?l=linux-arm-kernel&m=144051749807214&w=2 I am unsure what is going on, I suspect everyone involved in the discussion is. I just want to repost this to get the discussion restarted, as I still have to apply this patch with every kernel iteration to get my PB11MPCore Realview running. Testing by Neil Armstrong on the Oxnas NAS has revealed that this bug exist also on that widely deployed hardware, so we are probably currently regressing all ARM11MPCore systems. Cc: Russell King Cc: Will Deacon Fixes: a5e090acbf54 ("ARM: software-based priviledged-no-access support") Tested-by: Neil Armstrong Signed-off-by: Linus Walleij Signed-off-by: Russell King Signed-off-by: Greg Kroah-Hartman --- arch/arm/kernel/smp_tlb.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/arch/arm/kernel/smp_tlb.c +++ b/arch/arm/kernel/smp_tlb.c @@ -9,6 +9,7 @@ */ #include #include +#include #include #include @@ -40,8 +41,11 @@ static inline void ipi_flush_tlb_mm(void static inline void ipi_flush_tlb_page(void *arg) { struct tlb_args *ta = (struct tlb_args *)arg; + unsigned int __ua_flags = uaccess_save_and_enable(); local_flush_tlb_page(ta->ta_vma, ta->ta_start); + + uaccess_restore(__ua_flags); } static inline void ipi_flush_tlb_kernel_page(void *arg) @@ -54,8 +58,11 @@ static inline void ipi_flush_tlb_kernel_ static inline void ipi_flush_tlb_range(void *arg) { struct tlb_args *ta = (struct tlb_args *)arg; + unsigned int __ua_flags = uaccess_save_and_enable(); local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end); + + uaccess_restore(__ua_flags); } static inline void ipi_flush_tlb_kernel_range(void *arg) Patches currently in stable-queue which might be from linus.walleij@linaro.org are queue-4.9/arm-ux500-fix-prcmu_is_cpu_in_wfi-calculation.patch queue-4.9/arm-8634-1-hw_breakpoint-blacklist-scorpion-cpus.patch queue-4.9/arm-8613-1-fix-the-uaccess-crash-on-pb11mpcore.patch