Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752698AbcDZTXh (ORCPT ); Tue, 26 Apr 2016 15:23:37 -0400 Received: from mail.kernel.org ([198.145.29.136]:43726 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752270AbcDZTXg (ORCPT ); Tue, 26 Apr 2016 15:23:36 -0400 From: Andy Lutomirski To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, Borislav Petkov , Brian Gerst , Andi Kleen , Andy Lutomirski Subject: [PATCH 0/8] x86: A round of x86 segmentation improvements Date: Tue, 26 Apr 2016 12:23:23 -0700 Message-Id: X-Mailer: git-send-email 2.5.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2506 Lines: 58 Hi all- This is preparation for enabling FSGSBASE and fixing FS/GS switching better than my last attempt. It cleans up the code, fixes two more holes in X86_BUG_NULL_SEG handling (loadsegment(fs, val) and load_gs_index(val) failure handling), and makes set_thread_area behave in a well-defined manner. With these patches applied, modify_ldt should be the last remaining way for a user thread to get its cached descriptors out of sync with memory, except in the 64-bit FS/GS < 3 case. I'll fix modify_ldt as well, but those patches will come later. I'm sending these now because they seem to be good improvements on their own and it'll help avoid a monster patch series down the road. Tested on x86_32 with and without lazy GS and on x86_64. Andy Lutomirski (8): x86/asm: Stop depending on ptrace.h in alternative.h x86/asm: Make asm/alternative.h safe from assembly x86/segments/64: When loadsegment(fs, ...) fails, clear the base x86/segments/64: When load_gs_index fails, clear the base x86/arch_prctl/64: Remove FSBASE/GSBASE < 4G optimization x86/asm/64: Rename thread_struct's fs and gs to fsbase and gsbase x86/tls: Synchronize segment registers in set_thread_area selftests/x86/ldt_gdt: Test set_thread_area deletion of an active segment arch/x86/entry/entry_64.S | 6 + arch/x86/include/asm/alternative.h | 35 +---- arch/x86/include/asm/elf.h | 6 +- arch/x86/include/asm/kgdb.h | 2 + arch/x86/include/asm/processor.h | 11 +- arch/x86/include/asm/segment.h | 49 +++++-- arch/x86/include/asm/setup.h | 1 + arch/x86/include/asm/text-patching.h | 40 ++++++ arch/x86/kernel/alternative.c | 1 + arch/x86/kernel/cpu/common.c | 2 +- arch/x86/kernel/jump_label.c | 1 + arch/x86/kernel/kgdb.c | 1 + arch/x86/kernel/kprobes/core.c | 1 + arch/x86/kernel/kprobes/opt.c | 1 + arch/x86/kernel/module.c | 1 + arch/x86/kernel/process_64.c | 97 ++++--------- arch/x86/kernel/ptrace.c | 48 ++----- arch/x86/kernel/tls.c | 42 ++++++ arch/x86/kernel/traps.c | 1 + arch/x86/kvm/svm.c | 2 +- arch/x86/mm/extable.c | 10 ++ tools/testing/selftests/x86/ldt_gdt.c | 250 ++++++++++++++++++++++++++++++++++ 22 files changed, 446 insertions(+), 162 deletions(-) create mode 100644 arch/x86/include/asm/text-patching.h -- 2.5.5