From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f200.google.com (mail-pf0-f200.google.com [209.85.192.200]) by kanga.kvack.org (Postfix) with ESMTP id D8C346B02F4 for ; Wed, 8 Nov 2017 14:47:27 -0500 (EST) Received: by mail-pf0-f200.google.com with SMTP id v78so3007482pfk.8 for ; Wed, 08 Nov 2017 11:47:27 -0800 (PST) Received: from mga04.intel.com (mga04.intel.com. [192.55.52.120]) by mx.google.com with ESMTPS id y79si4823280pfb.41.2017.11.08.11.47.26 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 08 Nov 2017 11:47:26 -0800 (PST) Subject: [PATCH 15/30] x86, kaiser: map entry stack variables From: Dave Hansen Date: Wed, 08 Nov 2017 11:47:15 -0800 References: <20171108194646.907A1942@viggo.jf.intel.com> In-Reply-To: <20171108194646.907A1942@viggo.jf.intel.com> Message-Id: <20171108194715.3292DBFB@viggo.jf.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, dave.hansen@linux.intel.com, moritz.lipp@iaik.tugraz.at, daniel.gruss@iaik.tugraz.at, michael.schwarz@iaik.tugraz.at, richard.fellner@student.tugraz.at, luto@kernel.org, torvalds@linux-foundation.org, keescook@google.com, hughd@google.com, x86@kernel.org From: Dave Hansen There are times that we enter the kernel and do not have a safe stack, like at SYSCALL entry. We use the per-cpu vairables 'rsp_scratch' and 'cpu_current_top_of_stack' to save off the old %rsp and find a safe place to have a stack. You can not directly manipulate the CR3 register. You can only 'MOV' to it from another register, which means we need to clobber a register in order to do any CR3 manipulation. User-mapping these variables allows us to obtain a safe stack *before* we switch the CR3 value. Signed-off-by: Dave Hansen Cc: Moritz Lipp Cc: Daniel Gruss Cc: Michael Schwarz Cc: Richard Fellner Cc: Andy Lutomirski Cc: Linus Torvalds Cc: Kees Cook Cc: Hugh Dickins Cc: x86@kernel.org --- b/arch/x86/kernel/cpu/common.c | 2 +- b/arch/x86/kernel/process_64.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff -puN arch/x86/kernel/cpu/common.c~kaiser-user-map-stack-helper-vars arch/x86/kernel/cpu/common.c --- a/arch/x86/kernel/cpu/common.c~kaiser-user-map-stack-helper-vars 2017-11-08 10:45:34.001681383 -0800 +++ b/arch/x86/kernel/cpu/common.c 2017-11-08 10:45:34.007681383 -0800 @@ -1447,7 +1447,7 @@ DEFINE_PER_CPU_ALIGNED(struct stack_cana * trampoline, not the thread stack. Use an extra percpu variable to track * the top of the kernel stack directly. */ -DEFINE_PER_CPU(unsigned long, cpu_current_top_of_stack) = +DEFINE_PER_CPU_USER_MAPPED(unsigned long, cpu_current_top_of_stack) = (unsigned long)&init_thread_union + THREAD_SIZE; EXPORT_PER_CPU_SYMBOL(cpu_current_top_of_stack); diff -puN arch/x86/kernel/process_64.c~kaiser-user-map-stack-helper-vars arch/x86/kernel/process_64.c --- a/arch/x86/kernel/process_64.c~kaiser-user-map-stack-helper-vars 2017-11-08 10:45:34.003681383 -0800 +++ b/arch/x86/kernel/process_64.c 2017-11-08 10:45:34.007681383 -0800 @@ -59,7 +59,7 @@ #include #endif -__visible DEFINE_PER_CPU(unsigned long, rsp_scratch); +__visible DEFINE_PER_CPU_USER_MAPPED(unsigned long, rsp_scratch); /* Prints also some state that isn't saved in the pt_regs */ void __show_regs(struct pt_regs *regs, int all) _ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org