From patchwork Fri Apr 20 14:38:01 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Eric W. Biederman" X-Patchwork-Id: 10352901 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 83ADF600CC for ; Fri, 20 Apr 2018 14:47:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 00B98205F7 for ; Fri, 20 Apr 2018 14:47:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E960427EE2; Fri, 20 Apr 2018 14:47:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 628C5205F7 for ; Fri, 20 Apr 2018 14:47:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755243AbeDTOqE (ORCPT ); Fri, 20 Apr 2018 10:46:04 -0400 Received: from out03.mta.xmission.com ([166.70.13.233]:46792 "EHLO out03.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755171AbeDTOqD (ORCPT ); Fri, 20 Apr 2018 10:46:03 -0400 Received: from in02.mta.xmission.com ([166.70.13.52]) by out03.mta.xmission.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.87) (envelope-from ) id 1f9XIY-00086a-0h; Fri, 20 Apr 2018 08:46:02 -0600 Received: from [97.119.174.25] (helo=x220.int.ebiederm.org) by in02.mta.xmission.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.87) (envelope-from ) id 1f9XE5-0006Ha-0n; Fri, 20 Apr 2018 08:41:25 -0600 From: "Eric W. Biederman" To: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org, "Eric W. Biederman" , James Bottomley , Helge Deller , linux-parisc@vger.kernel.org Date: Fri, 20 Apr 2018 09:38:01 -0500 Message-Id: <20180420143811.9994-12-ebiederm@xmission.com> X-Mailer: git-send-email 2.14.1 In-Reply-To: <87604mhrnb.fsf@xmission.com> References: <87604mhrnb.fsf@xmission.com> X-XM-SPF: eid=1f9XE5-0006Ha-0n; ; ; mid=<20180420143811.9994-12-ebiederm@xmission.com>; ; ; hst=in02.mta.xmission.com; ; ; ip=97.119.174.25; ; ; frm=ebiederm@xmission.com; ; ; spf=neutral X-XM-AID: U2FsdGVkX19+7aR8UAOPisVR28mcInADRn2AZb7oPkk= X-SA-Exim-Connect-IP: 97.119.174.25 X-SA-Exim-Mail-From: ebiederm@xmission.com Subject: [REVIEW][PATCH 12/22] signal/parisc: Use force_sig_mceerr where appropriate X-SA-Exim-Version: 4.2.1 (built Thu, 05 May 2016 13:38:54 -0600) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In do_page_fault where an mceerr is generated stop and call force_sig_mceerr. Keeping the mcerr handling logic out of the force_sig_info call below. This ensures that only and always in the mcerr case is lsb interesting. This ensures setting set si_lsb in the future won't accidentally stomp another siginfo field in the non mcerr case. Cc: James Bottomley Cc: Helge Deller Cc: linux-parisc@vger.kernel.org Signed-off-by: "Eric W. Biederman" --- arch/parisc/mm/fault.c | 30 +++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-) diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c index 657b35096bd8..51215b0048ef 100644 --- a/arch/parisc/mm/fault.c +++ b/arch/parisc/mm/fault.c @@ -354,7 +354,6 @@ void do_page_fault(struct pt_regs *regs, unsigned long code, if (user_mode(regs)) { struct siginfo si; - unsigned int lsb = 0; clear_siginfo(&si); switch (code) { @@ -391,26 +390,27 @@ void do_page_fault(struct pt_regs *regs, unsigned long code, #ifdef CONFIG_MEMORY_FAILURE if (fault & (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) { + unsigned int lsb = 0; printk(KERN_ERR "MCE: Killing %s:%d due to hardware memory corruption fault at %08lx\n", tsk->comm, tsk->pid, address); - si.si_signo = SIGBUS; - si.si_code = BUS_MCEERR_AR; + /* + * Either small page or large page may be poisoned. + * In other words, VM_FAULT_HWPOISON_LARGE and + * VM_FAULT_HWPOISON are mutually exclusive. + */ + if (fault & VM_FAULT_HWPOISON_LARGE) + lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault)); + else if (fault & VM_FAULT_HWPOISON) + lsb = PAGE_SHIFT; + + force_sig_mceerr(BUS_MCEERR_AR, (void __user *) address, + lsb, current); + return; } #endif - /* - * Either small page or large page may be poisoned. - * In other words, VM_FAULT_HWPOISON_LARGE and - * VM_FAULT_HWPOISON are mutually exclusive. - */ - if (fault & VM_FAULT_HWPOISON_LARGE) - lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault)); - else if (fault & VM_FAULT_HWPOISON) - lsb = PAGE_SHIFT; - else - show_signal_msg(regs, code, address, tsk, vma); - si.si_addr_lsb = lsb; + show_signal_msg(regs, code, address, tsk, vma); si.si_errno = 0; si.si_addr = (void __user *) address;