From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from foss.arm.com ([217.140.101.70]:57914 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751445AbcGRM3u (ORCPT ); Mon, 18 Jul 2016 08:29:50 -0400 From: James Morse To: stable@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, Will Deacon , Catalin Marinas , Mark Rutland Subject: [stable:PATCH] valid_user_regs() backport Date: Mon, 18 Jul 2016 13:27:22 +0100 Message-Id: <1468844845-6129-1-git-send-email-james.morse@arm.com> Sender: stable-owner@vger.kernel.org List-ID: Hi all, These three copies of the same patch backport dbd4d7ca563f ("arm64: Rework valid_user_regs") to the stable kernels listed on kernel.org as far back as v3.16. This patch fixed a userspace triggerable oops when userspace tries to switch to a mode not supported by the kernel: [ 286.628508] Bad mode in Synchronous Abort handler detected, code 0x46000000 -- SVC (AArch32) [ 286.639625] CPU: 3 PID: 2072 Comm: inter Not tainted 4.4.14 #4504 [ 286.648391] Hardware name: ARM Juno development board (r1) (DT) [ ... ] [ 286.716784] Bad mode in Synchronous Abort handler detected, code 0x86000007 -- IABT (current EL) [ 286.725483] CPU: 3 PID: 2072 Comm: inter Not tainted 4.4.14 #4504 [ 286.731513] Hardware name: ARM Juno development board (r1) (DT) [ ... ] [ 286.840815] Internal error: Oops - bad mode: 0 [#1] PREEMPT SMP [ 286.846673] Modules linked in: [ 286.849699] CPU: 3 PID: 2072 Comm: inter Not tainted 4.4.14 #4504 [ 286.855728] Hardware name: ARM Juno development board (r1) (DT) Thanks, James arch/arm64/include/asm/ptrace.h | 34 +++--------------- arch/arm64/kernel/ptrace.c | 80 +++++++++++++++++++++++++++++++++++++++-- arch/arm64/kernel/signal.c | 4 +-- arch/arm64/kernel/signal32.c | 2 +- 4 files changed, 86 insertions(+), 34 deletions(-) -- 2.8.0.rc3