From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:45181 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753772AbcA0HBG (ORCPT ); Wed, 27 Jan 2016 02:01:06 -0500 Subject: Patch "arm64: Clear out any singlestep state on a ptrace detach operation" has been added to the 4.4-stable tree To: john.blackwood@ccur.com, gregkh@linuxfoundation.org, will.deacon@arm.com Cc: , From: Date: Tue, 26 Jan 2016 22:56:34 -0800 Message-ID: <14538777946294@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled arm64: Clear out any singlestep state on a ptrace detach operation to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm64-clear-out-any-singlestep-state-on-a-ptrace-detach-operation.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 5db4fd8c52810bd9740c1240ebf89223b171aa70 Mon Sep 17 00:00:00 2001 From: John Blackwood Date: Mon, 7 Dec 2015 11:50:34 +0000 Subject: arm64: Clear out any singlestep state on a ptrace detach operation From: John Blackwood commit 5db4fd8c52810bd9740c1240ebf89223b171aa70 upstream. Make sure to clear out any ptrace singlestep state when a ptrace(2) PTRACE_DETACH call is made on arm64 systems. Otherwise, the previously ptraced task will die off with a SIGTRAP signal if the debugger just previously singlestepped the ptraced task. Signed-off-by: John Blackwood [will: added comment to justify why this is in the arch code] Signed-off-by: Will Deacon Signed-off-by: Greg Kroah-Hartman --- arch/arm64/kernel/ptrace.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -58,6 +58,12 @@ */ void ptrace_disable(struct task_struct *child) { + /* + * This would be better off in core code, but PTRACE_DETACH has + * grown its fair share of arch-specific worts and changing it + * is likely to cause regressions on obscure architectures. + */ + user_disable_single_step(child); } #ifdef CONFIG_HAVE_HW_BREAKPOINT Patches currently in stable-queue which might be from john.blackwood@ccur.com are queue-4.4/arm64-clear-out-any-singlestep-state-on-a-ptrace-detach-operation.patch