From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751667AbcFXIam (ORCPT ); Fri, 24 Jun 2016 04:30:42 -0400 Received: from mail.skyhub.de ([78.46.96.112]:37033 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751586AbcFXIak (ORCPT ); Fri, 24 Jun 2016 04:30:40 -0400 From: Borislav Petkov To: LKML Cc: Andrew Morton , Andy Lutomirski , X86 ML Subject: [PATCH 1/3] x86/dumpstack: Honor supplied @regs arg Date: Fri, 24 Jun 2016 10:30:18 +0200 Message-Id: <20160624083020.26871-2-bp@alien8.de> X-Mailer: git-send-email 2.8.4 In-Reply-To: <20160624083020.26871-1-bp@alien8.de> References: <20160624083020.26871-1-bp@alien8.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andy Lutomirski The comment suggests that show_stack(NULL, NULL) should backtrace the current context, but the code doesn't match the comment. If regs are given, start the "Stack:" hexdump at regs->sp. Signed-off-by: Andy Lutomirski Cc: Brian Gerst Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Kees Cook Cc: Linus Torvalds Cc: Thomas Gleixner Cc: x86-ml Link: http://lkml.kernel.org/r/efcd79bf4106d61f1cd258c2caa87f3a0618eeac.1466036668.git.luto@kernel.org Signed-off-by: Borislav Petkov --- arch/x86/kernel/dumpstack_32.c | 4 +++- arch/x86/kernel/dumpstack_64.c | 4 +++- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c index 464ffd69b92e..91069ebe3c87 100644 --- a/arch/x86/kernel/dumpstack_32.c +++ b/arch/x86/kernel/dumpstack_32.c @@ -98,7 +98,9 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, int i; if (sp == NULL) { - if (task) + if (regs) + sp = (unsigned long *)regs->sp; + else if (task) sp = (unsigned long *)task->thread.sp; else sp = (unsigned long *)&sp; diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c index 5f1c6266eb30..603356a5597a 100644 --- a/arch/x86/kernel/dumpstack_64.c +++ b/arch/x86/kernel/dumpstack_64.c @@ -266,7 +266,9 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, * back trace for this cpu: */ if (sp == NULL) { - if (task) + if (regs) + sp = (unsigned long *)regs->sp; + else if (task) sp = (unsigned long *)task->thread.sp; else sp = (unsigned long *)&sp; -- 2.8.4