From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-560692-1519835565-2-6965343406891787990 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.249, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='uk', MailFrom='org' X-Spam-charsets: plain='UTF-8' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1519835565; b=TKObXcGczg/BJuGiNqtJ+4KFxTfBY93OM7QpV23J7WCerg9 70NBUvYhEdWDFWWUlIYUi0lLXl2JEZ7ddth0H7LdzP/FnLnPOeqLF9HCC34d59IS Tgr3uXRzAxO5dNSKkZoEBfVbFWXUQvgonYsAfi3rrkzBqt8TUl/Zj2NFd6/iKPHY A3+RWjpINu+TNEcf60/zqy5FX7DiT6XFpzpb7/5MUQaBh9XlGd3Bawj0MJPdpdwC 2YJfDlo3JBZLFcDSlLU7G71lgqFYHHwP9sGQhrhGozM7kYBaWuLxGC73Ybyt43MP KTlyj4SneZ1rsFlxaP4tuGKMAcupGsq1CLydFXw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=content-type:content-transfer-encoding :mime-version:from:to:cc:date:message-id:subject:in-reply-to :sender:list-id; s=arctest; t=1519835565; bh=vjcLJ4WwDJcLUtVUosh pz8+GnTFrJNI8A002V0peKrE=; b=XiSRmUZXdBKAg1hOtWtucYtQ7Had08l8Cac G+KFZJpGQeEEvCg32D94/DlkRh5AvgJCbLhGTLRsL/VJRv0HTQ3fMiqCOLCvSRWQ oWonrgHYIOjKuipcLKlsQkYSlpZ/NcK2XlP/4oFclwzuwPADnB2FdFlKH7r6/cjA ACNGFoOEnd2GOCXjjikcXNr5geuC2US7FmeaEmFx6xzZuTCK+j8c5H95i0IYIjTE KAxaMuIrIiyHpyYckTnNxAeRn/B2Fjbg8y23Wmjv+dKRKcFl8ufkpAphxz1SiHkI C0sx0EDc0bK7ga5SYaNAwmCP/wiylIlYNBhja6XtT6wPcBmGNoQ== ARC-Authentication-Results: i=1; mx1.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=decadent.org.uk; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=decadent.org.uk header.result=pass header_is_org_domain=yes Authentication-Results: mx1.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=decadent.org.uk; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=decadent.org.uk header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932732AbeB1Qc3 (ORCPT ); Wed, 28 Feb 2018 11:32:29 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:35109 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753277AbeB1QOX (ORCPT ); Wed, 28 Feb 2018 11:14:23 -0500 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Ralf Baechle" , linux-mips@linux-mips.org, "Maciej W. Rozycki" Date: Wed, 28 Feb 2018 15:20:18 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 102/254] MIPS: ptrace: Fix FP context restoration FCSR regression In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 3.16.55-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: "Maciej W. Rozycki" commit 4249548454f7ba4581aeee26bd83f42b48a14d15 upstream. Fix a floating-point context restoration regression introduced with commit 9b26616c8d9d ("MIPS: Respect the ISA level in FCSR handling") that causes a Floating Point exception and consequently a kernel oops with hard float configurations when one or more FCSR Enable and their corresponding Cause bits are set both at a time via a ptrace(2) call. To do so reinstate Cause bit masking originally introduced with commit b1442d39fac2 ("MIPS: Prevent user from setting FCSR cause bits") to address this exact problem and then inadvertently removed from the PTRACE_SETFPREGS request with the commit referred above. Signed-off-by: Maciej W. Rozycki Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/13238/ Signed-off-by: Ralf Baechle Signed-off-by: Ben Hutchings --- arch/mips/kernel/ptrace.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -176,6 +176,7 @@ int ptrace_setfpregs(struct task_struct } __get_user(value, data + 64); + value &= ~FPU_CSR_ALL_X; fcr31 = child->thread.fpu.fcr31; mask = boot_cpu_data.fpu_msk31; child->thread.fpu.fcr31 = (value & ~mask) | (fcr31 & mask);