From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:38082 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751589AbdHGVv3 (ORCPT ); Mon, 7 Aug 2017 17:51:29 -0400 Subject: Patch "powerpc/tm: Fix saving of TM SPRs in core dump" has been added to the 4.9-stable tree To: gromero@linux.vnet.ibm.com, cyrilbur@gmail.com, gregkh@linuxfoundation.org, mpe@ellerman.id.au Cc: , From: Date: Mon, 07 Aug 2017 14:51:29 -0700 Message-ID: <150214268993248@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 powerpc/tm: Fix saving of TM SPRs in core dump to the 4.9-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: powerpc-tm-fix-saving-of-tm-sprs-in-core-dump.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From cd63f3cf1d59b7ad8419eba1cac8f9126e79cc43 Mon Sep 17 00:00:00 2001 From: Gustavo Romero Date: Wed, 19 Jul 2017 01:44:13 -0400 Subject: powerpc/tm: Fix saving of TM SPRs in core dump From: Gustavo Romero commit cd63f3cf1d59b7ad8419eba1cac8f9126e79cc43 upstream. Currently flush_tmregs_to_thread() does not save the TM SPRs (TFHAR, TFIAR, TEXASR) to the thread struct, unless the process is currently inside a suspended transaction. If the process is core dumping, and the TM SPRs have changed since the last time the process was context switched, then we will save stale values of the TM SPRs to the core dump. Fix it by saving the live register state to the thread struct in that case. Fixes: 08e1c01d6aed ("powerpc/ptrace: Enable support for TM SPR state") Signed-off-by: Gustavo Romero Reviewed-by: Cyril Bur Signed-off-by: Michael Ellerman Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/kernel/ptrace.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) --- a/arch/powerpc/kernel/ptrace.c +++ b/arch/powerpc/kernel/ptrace.c @@ -127,12 +127,19 @@ static void flush_tmregs_to_thread(struc * If task is not current, it will have been flushed already to * it's thread_struct during __switch_to(). * - * A reclaim flushes ALL the state. + * A reclaim flushes ALL the state or if not in TM save TM SPRs + * in the appropriate thread structures from live. */ - if (tsk == current && MSR_TM_SUSPENDED(mfmsr())) - tm_reclaim_current(TM_CAUSE_SIGNAL); + if (tsk != current) + return; + if (MSR_TM_SUSPENDED(mfmsr())) { + tm_reclaim_current(TM_CAUSE_SIGNAL); + } else { + tm_enable(); + tm_save_sprs(&(tsk->thread)); + } } #else static inline void flush_tmregs_to_thread(struct task_struct *tsk) { } Patches currently in stable-queue which might be from gromero@linux.vnet.ibm.com are queue-4.9/powerpc-tm-fix-saving-of-tm-sprs-in-core-dump.patch