From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753351AbdKXEdK (ORCPT ); Thu, 23 Nov 2017 23:33:10 -0500 Received: from mail.kernel.org ([198.145.29.99]:43576 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751859AbdKXEdI (ORCPT ); Thu, 23 Nov 2017 23:33:08 -0500 DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C11D821924 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=luto@kernel.org From: Andy Lutomirski To: X86 ML Cc: Borislav Petkov , "linux-kernel@vger.kernel.org" , Brian Gerst , Dave Hansen , Linus Torvalds , Josh Poimboeuf , Andy Lutomirski Subject: [PATCH v3 00/19] Entry stack switching Date: Thu, 23 Nov 2017 20:32:46 -0800 Message-Id: X-Mailer: git-send-email 2.13.6 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This sets up stack switching, including for SYSCALL. I think it's in decent shape. I'm fiddling with a patch to make the TSS remap read-only on 64-bit. Known issues: - I think we're going to want a way to turn the stack switching on and off either at boot time or at runtime. It should be fairly straightforward to make it work. - I think the ORC unwinder isn't so good at dealing with stack overflows. It bails too early (I think), resulting in lots of ? entries. This isn't a regression with this series -- it's just something that could be improved. Changes from v2: - Tons of review comments - The IDT entry stack switching code is less messy - The last patch is new Changes from v1: - Fixed KASAN for real (as far as I can tell). - Compiler errors due to my old hackish KASAN fix are gone. - Context tracking lockdep errors are fixed (and maybe Changes from farther back: - This is quite massively changed from last time. - 32-bit seems to build and mostly work - KASAN is less broken now Andy Lutomirski (19): x86/asm/64: Allocate and enable the SYSENTER stack x86/dumpstack: Add get_stack_info() support for the SYSENTER stack x86/gdt: Put per-cpu GDT remaps in ascending order x86/fixmap: Generalize the GDT fixmap mechanism x86/kasan/64: Teach KASAN about the cpu_entry_area x86/asm: Fix assumptions that the HW TSS is at the beginning of cpu_tss x86/dumpstack: Handle stack overflow on all stacks x86/asm: Move SYSENTER_stack to the beginning of struct tss_struct x86/asm: Remap the TSS into the cpu entry area x86/asm/64: Separate cpu_current_top_of_stack from TSS.sp0 x86/espfix/64: Stop assuming that pt_regs is on the entry stack x86/asm/64: Use a percpu trampoline stack for IDT entries x86/asm/64: Return to userspace from the trampoline stack x86/entry/64: Create a percpu SYSCALL entry trampoline x86/irq: Remove an old outdated comment about context tracking races x86/irq/64: In the stack overflow warning, print the offending IP x86/entry/64: Move the IST stacks into cpu_entry_area x86/entry/64: Remove the SYSENTER stack canary x86/entry: Clean up SYSENTER_stack code arch/x86/entry/entry_32.S | 6 +- arch/x86/entry/entry_64.S | 170 ++++++++++++++++++++++++++++++++----- arch/x86/entry/entry_64_compat.S | 7 +- arch/x86/include/asm/desc.h | 11 +-- arch/x86/include/asm/fixmap.h | 58 ++++++++++++- arch/x86/include/asm/processor.h | 49 ++++++----- arch/x86/include/asm/stacktrace.h | 3 + arch/x86/include/asm/switch_to.h | 2 +- arch/x86/include/asm/thread_info.h | 2 +- arch/x86/include/asm/traps.h | 1 - arch/x86/kernel/asm-offsets.c | 7 ++ arch/x86/kernel/asm-offsets_32.c | 5 -- arch/x86/kernel/asm-offsets_64.c | 1 + arch/x86/kernel/cpu/common.c | 133 +++++++++++++++++++++-------- arch/x86/kernel/doublefault.c | 36 ++++---- arch/x86/kernel/dumpstack.c | 42 ++++++--- arch/x86/kernel/dumpstack_32.c | 6 ++ arch/x86/kernel/dumpstack_64.c | 6 ++ arch/x86/kernel/irq.c | 12 --- arch/x86/kernel/irq_64.c | 4 +- arch/x86/kernel/process.c | 13 ++- arch/x86/kernel/process_64.c | 1 + arch/x86/kernel/traps.c | 27 +++--- arch/x86/kernel/vmlinux.lds.S | 10 +++ arch/x86/mm/kasan_init_64.c | 13 ++- arch/x86/power/cpu.c | 16 ++-- arch/x86/xen/mmu_pv.c | 2 +- 27 files changed, 473 insertions(+), 170 deletions(-) -- 2.13.6