From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 51273C43381 for ; Mon, 18 Feb 2019 13:55:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1F2A6217D9 for ; Mon, 18 Feb 2019 13:55:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550498110; bh=Pfqgf6qkYUj6MjWIH5UWOVX1JqVa+YcUE6i14hnlE80=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=nsM6Ij2NWAaXj6BbnAqPFDh+Wa44wLaAAGrMeq7jLbylidzLEKFZpASKd/hQ98YzS ijUxb0DNwmRXrAJnH6QQX9BApHIKogYy3Okf8yrPg8quTJixyeVcdoBIR5x7mqcb1F SK92eVeNVbmxGV7GMOXhwA5AuuxU+Tv4PMZNtL4I= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387461AbfBRNzI (ORCPT ); Mon, 18 Feb 2019 08:55:08 -0500 Received: from mail.kernel.org ([198.145.29.99]:35082 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387446AbfBRNzF (ORCPT ); Mon, 18 Feb 2019 08:55:05 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0C301217D9; Mon, 18 Feb 2019 13:55:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550498104; bh=Pfqgf6qkYUj6MjWIH5UWOVX1JqVa+YcUE6i14hnlE80=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NTMcg73xp7sD4g9jYp1fzf4twqTaukSAY30gWpJD20CWQbFuzZlo9aAqR0CaKc6yy /rrG6qi0I4osKkQKYjs1e+MinBIhClep4QI15zQoR3IBYpXj8BkB6aAmqS7xWylFG5 ZN0OFzQ+ufJQkgXJZf4LTsGj11sOKttG40au75pw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Julien Thierry , Russell King , "David A. Long" , Sasha Levin Subject: [PATCH 4.14 06/62] ARM: 8790/1: signal: always use __copy_to_user to save iwmmxt context Date: Mon, 18 Feb 2019 14:43:12 +0100 Message-Id: <20190218133506.328269515@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190218133505.801423074@linuxfoundation.org> References: <20190218133505.801423074@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ Commit 73839798af7ebc6c8d0c9271ebbbc148700e521f upstream. When setting a dummy iwmmxt context, create a local instance and use __copy_to_user both cases whether iwmmxt is being used or not. This has the benefit of disabling/enabling PAN once for the whole copy intead of once per write. Signed-off-by: Julien Thierry Signed-off-by: Russell King Signed-off-by: David A. Long Reviewed-by: Julien Thierry Signed-off-by: Sasha Levin --- arch/arm/kernel/signal.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c index 1dc1f39825b6..b12499cc3582 100644 --- a/arch/arm/kernel/signal.c +++ b/arch/arm/kernel/signal.c @@ -76,8 +76,6 @@ static int preserve_iwmmxt_context(struct iwmmxt_sigframe __user *frame) kframe->magic = IWMMXT_MAGIC; kframe->size = IWMMXT_STORAGE_SIZE; iwmmxt_task_copy(current_thread_info(), &kframe->storage); - - err = __copy_to_user(frame, kframe, sizeof(*frame)); } else { /* * For bug-compatibility with older kernels, some space @@ -85,10 +83,14 @@ static int preserve_iwmmxt_context(struct iwmmxt_sigframe __user *frame) * Set the magic and size appropriately so that properly * written userspace can skip it reliably: */ - __put_user_error(DUMMY_MAGIC, &frame->magic, err); - __put_user_error(IWMMXT_STORAGE_SIZE, &frame->size, err); + *kframe = (struct iwmmxt_sigframe) { + .magic = DUMMY_MAGIC, + .size = IWMMXT_STORAGE_SIZE, + }; } + err = __copy_to_user(frame, kframe, sizeof(*kframe)); + return err; } -- 2.19.1