From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932226AbcEXWs5 (ORCPT ); Tue, 24 May 2016 18:48:57 -0400 Received: from mail.kernel.org ([198.145.29.136]:36659 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932112AbcEXWsz (ORCPT ); Tue, 24 May 2016 18:48:55 -0400 From: Andy Lutomirski To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, Borislav Petkov , Kees Cook , Brian Gerst , Andy Lutomirski Subject: [PATCH 4/7] x86/dumpstack: If addr_limit is non-default, display it Date: Tue, 24 May 2016 15:48:41 -0700 Message-Id: X-Mailer: git-send-email 2.5.5 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This will help debug OOPSes related to USER_DS vs KERNEL_DS. Signed-off-by: Andy Lutomirski --- arch/x86/kernel/dumpstack_32.c | 4 ++++ arch/x86/kernel/dumpstack_64.c | 5 +++++ 2 files changed, 9 insertions(+) diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c index 464ffd69b92e..5dbb08fd8291 100644 --- a/arch/x86/kernel/dumpstack_32.c +++ b/arch/x86/kernel/dumpstack_32.c @@ -124,8 +124,12 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, void show_regs(struct pt_regs *regs) { int i; + struct thread_info *ti = current_thread_info(); show_regs_print_info(KERN_EMERG); + if (ti->addr_limit.seg != TASK_SIZE_MAX) + printk(KERN_DEFAULT "task.addr_limit: 0x%lx\n", + ti->addr_limit.seg); __show_regs(regs, !user_mode(regs)); /* diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c index 5f1c6266eb30..2fdeb64dfed0 100644 --- a/arch/x86/kernel/dumpstack_64.c +++ b/arch/x86/kernel/dumpstack_64.c @@ -301,9 +301,14 @@ void show_regs(struct pt_regs *regs) { int i; unsigned long sp; + struct thread_info *ti = current_thread_info(); sp = regs->sp; + show_regs_print_info(KERN_DEFAULT); + if (ti->addr_limit.seg != TASK_SIZE_MAX) + printk(KERN_DEFAULT "task.addr_limit: 0x%lx\n", + ti->addr_limit.seg); __show_regs(regs, 1); /* -- 2.5.5