From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:32780 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751241AbcFDSlO (ORCPT ); Sat, 4 Jun 2016 14:41:14 -0400 Subject: Patch "MIPS: ptrace: Fix FP context restoration FCSR regression" has been added to the 4.5-stable tree To: macro@imgtec.com, gregkh@linuxfoundation.org, ralf@linux-mips.org Cc: , From: Date: Sat, 04 Jun 2016 11:41:12 -0700 Message-ID: <1465065672214253@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 MIPS: ptrace: Fix FP context restoration FCSR regression to the 4.5-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: mips-ptrace-fix-fp-context-restoration-fcsr-regression.patch and it can be found in the queue-4.5 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 4249548454f7ba4581aeee26bd83f42b48a14d15 Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" Date: Thu, 12 May 2016 10:18:27 +0100 Subject: MIPS: ptrace: Fix FP context restoration FCSR regression From: Maciej W. Rozycki commit 4249548454f7ba4581aeee26bd83f42b48a14d15 upstream. Fix a floating-point context restoration regression introduced with commit 9b26616c8d9d ("MIPS: Respect the ISA level in FCSR handling") that causes a Floating Point exception and consequently a kernel oops with hard float configurations when one or more FCSR Enable and their corresponding Cause bits are set both at a time via a ptrace(2) call. To do so reinstate Cause bit masking originally introduced with commit b1442d39fac2 ("MIPS: Prevent user from setting FCSR cause bits") to address this exact problem and then inadvertently removed from the PTRACE_SETFPREGS request with the commit referred above. Signed-off-by: Maciej W. Rozycki Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/13238/ Signed-off-by: Ralf Baechle Signed-off-by: Greg Kroah-Hartman --- arch/mips/kernel/ptrace.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -176,6 +176,7 @@ int ptrace_setfpregs(struct task_struct } __get_user(value, data + 64); + value &= ~FPU_CSR_ALL_X; fcr31 = child->thread.fpu.fcr31; mask = boot_cpu_data.fpu_msk31; child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask); Patches currently in stable-queue which might be from macro@imgtec.com are queue-4.5/mips-disable-preemption-during-prctl-pr_set_fp_mode.patch queue-4.5/mips-ptrace-prevent-writes-to-read-only-fcsr-bits.patch queue-4.5/mips-msa-fix-a-link-error-on-_init_msa_upper-with-older-gcc.patch queue-4.5/mips-ptrace-fix-fp-context-restoration-fcsr-regression.patch queue-4.5/mips-vdso-build-with-fno-strict-aliasing.patch queue-4.5/mips-math-emu-fix-jalr-emulation-when-rd-0.patch