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=-12.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,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 F1F5AC433E4 for ; Mon, 17 Aug 2020 07:32:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BAB16207DF for ; Mon, 17 Aug 2020 07:32:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="mK1/oXp6" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727011AbgHQHc6 (ORCPT ); Mon, 17 Aug 2020 03:32:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44298 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726878AbgHQHcf (ORCPT ); Mon, 17 Aug 2020 03:32:35 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DABA6C061346; Mon, 17 Aug 2020 00:32:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=3qEOF4AeMzDrBPiTnGe1Fi7T4ulUxh9tT2b5Llhhj24=; b=mK1/oXp62aR0yay7hI5rxF1rAO oIsweDRzAybAXvXwihafnDeOYhrE2n+0bZlTynkTLCeN2Dft2OWptTFcZ0c+Ljmzou4BBptsQZ+cE 0WcSunosxHVcotlNa/rI3b318DLQXHBoYZZegd9x5Yis9biXRTIjkMLxPL3Usu9AkBvWYJ3qmMQf1 l6wqXqzOVXQI/CO1e536dwgXJwAxJPt8DWi26u63Db+xcZ7fBk6a4uIvosgZsLEb9gJZhTvzW+Ta5 YxOkXrxmW78qeAsfMYFzC1ir41mo1Ahv1Nsz4QILF/04RjFQMvKx+/88wZzYfZLpGewiWy9mnrHqC +/UpGE0w==; Received: from [2001:4bb8:188:3918:4550:cdf7:3d45:afb9] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1k7Zd8-0000x5-1X; Mon, 17 Aug 2020 07:32:30 +0000 From: Christoph Hellwig To: Al Viro , Michael Ellerman , x86@kernel.org Cc: Kees Cook , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH 10/11] powerpc: use non-set_fs based maccess routines Date: Mon, 17 Aug 2020 09:32:11 +0200 Message-Id: <20200817073212.830069-11-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200817073212.830069-1-hch@lst.de> References: <20200817073212.830069-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Provide __get_kernel_nofault and __put_kernel_nofault routines to implement the maccess routines without messing with set_fs and without opening up access to user space. Signed-off-by: Christoph Hellwig --- arch/powerpc/include/asm/uaccess.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h index 00699903f1efca..a31de40ac00b62 100644 --- a/arch/powerpc/include/asm/uaccess.h +++ b/arch/powerpc/include/asm/uaccess.h @@ -623,4 +623,20 @@ do { \ __put_user_goto(*(u8*)(_src + _i), (u8 __user *)(_dst + _i), e);\ } while (0) +#define HAVE_GET_KERNEL_NOFAULT + +#define __get_kernel_nofault(dst, src, type, err_label) \ +do { \ + int __kr_err; \ + \ + __get_user_size(*((type *)(dst)), (__force type __user *)(src), \ + sizeof(type), __kr_err); \ + if (unlikely(__kr_err)) \ + goto err_label; \ +} while (0) + +#define __put_kernel_nofault(dst, src, type, err_label) \ + __put_user_size_goto(*((type *)(src)), \ + (__force type __user *)(dst), sizeof(type), err_label) + #endif /* _ARCH_POWERPC_UACCESS_H */ -- 2.28.0