From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751310AbdFFBFq (ORCPT ); Mon, 5 Jun 2017 21:05:46 -0400 Received: from mail-qt0-f193.google.com ([209.85.216.193]:35284 "EHLO mail-qt0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751215AbdFFBFp (ORCPT ); Mon, 5 Jun 2017 21:05:45 -0400 From: Ram Pai To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, dave.hansen@intel.com, hbabu@us.ibm.com, linuxram@us.ibm.com Subject: [RFC PATCH 0/7 v1] powerpc: Memory Protection Keys Date: Mon, 5 Jun 2017 18:05:02 -0700 Message-Id: <1496711109-4968-1-git-send-email-linuxram@us.ibm.com> X-Mailer: git-send-email 1.7.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Memory protection keys enable applications to protect its address space from inadvertent access or corruption from itself. The overall idea: A process allocates a key and associates it with a address range within its address space. The process than can dynamically set read/write permissions on the key without involving the kernel. Any code that violates the permissions off the address space; as defined by its associated key, will receive a segmentation fault. This patch series enables the feature on PPC64. It is enabled on HPTE 64K-page platform. ISA3.0 section 5.7.13 describes the detailed specifications. Testing: This patch series has passed all the protection key tests available in the selftests directory. Though the test are written for x86, I have updated the tests to cater to powerpc. Will send the patch separately, along with documentation updates. Thanks-to: Dave Hansen, Aneesh, Paul Mackerras, Michael Ellermen :) Ram Pai (7): Free up four PTE bits to accommadate memory keys Implement sys_pkey_alloc and sys_pkey_free system call. store and restore the key state across context switches. Implementation for sys_mprotect_pkey() system call. Program HPTE key protection bits. Handle exceptions caused by violation of key protection. Deliver SEGV signal on protection key violation. arch/powerpc/Kconfig | 15 ++ arch/powerpc/include/asm/book3s/64/hash-4k.h | 12 ++ arch/powerpc/include/asm/book3s/64/hash-64k.h | 38 ++-- arch/powerpc/include/asm/book3s/64/hash.h | 8 +- arch/powerpc/include/asm/book3s/64/mmu-hash.h | 10 + arch/powerpc/include/asm/book3s/64/mmu.h | 10 + arch/powerpc/include/asm/book3s/64/pgtable.h | 84 +++++++- arch/powerpc/include/asm/mman.h | 29 +-- arch/powerpc/include/asm/mmu_context.h | 12 ++ arch/powerpc/include/asm/pkeys.h | 159 +++++++++++++++ arch/powerpc/include/asm/processor.h | 5 + arch/powerpc/include/asm/reg.h | 10 +- arch/powerpc/include/asm/systbl.h | 3 + arch/powerpc/include/asm/unistd.h | 6 +- arch/powerpc/include/uapi/asm/ptrace.h | 5 +- arch/powerpc/include/uapi/asm/unistd.h | 3 + arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/exceptions-64s.S | 10 +- arch/powerpc/kernel/process.c | 18 ++ arch/powerpc/kernel/signal_32.c | 18 +- arch/powerpc/kernel/signal_64.c | 11 ++ arch/powerpc/kernel/traps.c | 49 +++++ arch/powerpc/mm/Makefile | 1 + arch/powerpc/mm/dump_linuxpagetables.c | 3 +- arch/powerpc/mm/fault.c | 21 +- arch/powerpc/mm/hash64_4k.c | 12 +- arch/powerpc/mm/hash64_64k.c | 73 +++---- arch/powerpc/mm/hash_utils_64.c | 43 ++++- arch/powerpc/mm/hugetlbpage-hash64.c | 16 +- arch/powerpc/mm/mmu_context_book3s64.c | 5 + arch/powerpc/mm/pkeys.c | 267 ++++++++++++++++++++++++++ include/linux/mm.h | 32 +-- include/uapi/asm-generic/mman-common.h | 2 +- 33 files changed, 856 insertions(+), 135 deletions(-) create mode 100644 arch/powerpc/include/asm/pkeys.h create mode 100644 arch/powerpc/mm/pkeys.c -- 1.8.3.1