From patchwork Wed May 6 06:22:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11530411 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 28F081392 for ; Wed, 6 May 2020 06:23:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 120FD2075E for ; Wed, 6 May 2020 06:23:25 +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="WRFvLxLA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728422AbgEFGXT (ORCPT ); Wed, 6 May 2020 02:23:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58842 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1727051AbgEFGXM (ORCPT ); Wed, 6 May 2020 02:23:12 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 76D52C061A10; Tue, 5 May 2020 23:23:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.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=1V9FXGwvoUyADOJtECmZzXrzilRy7l0jj6styYqt0KU=; b=WRFvLxLA/MEdLMrePczuELjuEW 72WQod2YCGoc0J7XuWxFW5Y83J/ykdaW/Fvtk4rs7oIQKRnkopymKyz3EwOuypFcUXYqHVjttqChT ZWZNpoWAW9huIiQ+2137fhpck8Jvk/OBURKnP8nGMpNXmGD2pqVc7U+++Rpk2a2Bk7XJ02fZnKKsU IEroVJ/nwQQ94XE+aNULG0kXWN5Eggp6JsjK1mQHpJq/Xtrfl5qzt8d1FvzbHRkBpEs4Bug8AGZs1 Sj9Fq+m0wtnluKjoULPl+k1peWL6urmnAGcvGAut03L8y2xEcPesIPXq+cvi5XhfJas+TJjKchnlZ cprmKauQ==; Received: from [2001:4bb8:191:66b6:c70:4a89:bc61:2] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jWDSY-0006rv-M1; Wed, 06 May 2020 06:23:11 +0000 From: Christoph Hellwig To: x86@kernel.org, Alexei Starovoitov , Daniel Borkmann , Masami Hiramatsu , Linus Torvalds , Andrew Morton Cc: linux-parisc@vger.kernel.org, linux-um@lists.infradead.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 15/15] x86: use non-set_fs based maccess routines Date: Wed, 6 May 2020 08:22:23 +0200 Message-Id: <20200506062223.30032-16-hch@lst.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200506062223.30032-1-hch@lst.de> References: <20200506062223.30032-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org Provide arch_kernel_read and arch_kernel_write routines to implement the maccess routines without messing with set_fs and without stac/clac that opens up access to user space. Signed-off-by: Christoph Hellwig --- arch/x86/include/asm/uaccess.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index d8f283b9a569c..765e18417b3ba 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -523,5 +523,21 @@ do { \ unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label); \ } while (0) +#define HAVE_ARCH_PROBE_KERNEL + +#define arch_kernel_read(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 arch_kernel_write(dst, src, type, err_label) \ + __put_user_size(*((type *)(src)), (__force type __user *)(dst), \ + sizeof(type), err_label) + #endif /* _ASM_X86_UACCESS_H */