From patchwork Tue May 19 13:44:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11557711 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 6392F13B4 for ; Tue, 19 May 2020 13:45:49 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2BFEB20835 for ; Tue, 19 May 2020 13:45:49 +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="cxNIyYsY" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2BFEB20835 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 8CD3880014; Tue, 19 May 2020 09:45:46 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 87E1980006; Tue, 19 May 2020 09:45:46 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 794AB80014; Tue, 19 May 2020 09:45:46 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0087.hostedemail.com [216.40.44.87]) by kanga.kvack.org (Postfix) with ESMTP id 5DBCA80006 for ; Tue, 19 May 2020 09:45:46 -0400 (EDT) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 22BC0180AD807 for ; Tue, 19 May 2020 13:45:46 +0000 (UTC) X-FDA: 76833591492.13.bat67_89a412a084412 X-Spam-Summary: 2,0,0,01ec0e6f7b7da2ea,d41d8cd98f00b204,batv+7be89c046017ed76dda0+6113+infradead.org+hch@bombadil.srs.infradead.org,,RULES_HIT:41:355:379:541:800:960:988:989:1260:1311:1314:1345:1359:1437:1515:1534:1541:1711:1730:1747:1777:1792:2194:2199:2393:2559:2562:2901:3138:3139:3140:3141:3142:3352:3865:3867:3868:3874:4605:5007:6261:6653:10004:11026:11473:11657:11658:11914:12043:12048:12160:12296:12297:12438:12517:12519:12555:12895:13069:13311:13357:13894:14181:14384:14394:14721:21080:21451:21627:21795:30051:30054,0,RBL:198.137.202.133:@bombadil.srs.infradead.org:.lbl8.mailshell.net-62.8.0.100 64.201.201.201,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:6,LUA_SUMMARY:none X-HE-Tag: bat67_89a412a084412 X-Filterd-Recvd-Size: 3212 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf18.hostedemail.com (Postfix) with ESMTP for ; Tue, 19 May 2020 13:45:45 +0000 (UTC) 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=z84HF8MbiF+uWN8N63G2E43OTwbdeCsOdqVBGb9xrkM=; b=cxNIyYsYdXb8Q8KjQwOwlsf+BL 7MRU0p5saxO3z1PrKuYd9WPPeIbTbJMbF1JwJdZm0Xt9R/eHZwBRqQqI007LKTx5WTiRetwbcnuvV tzdi4Ajhp40h0vK/H4wRYN5vfDgLhrMZuy+/Y2sV/dVHi8p9oROPJ8Jn4Kys2t8ktQyzcbka7dgA7 Wl/rhvFpuC0b5T8snuJW6hHFfz7iJ3/oAMnilsCEMTSWAV4Iw1ziv33m2Hx6X+FPdOKtkmqo4pzfk ZO992lyCxWJxq8EfOOj7NbNchugOAReaCnLPiY/bXoPG+K5EaYEdxwoKcylrL7vng9I+UlkfErBq1 67s/NN2w==; Received: from [2001:4bb8:188:1506:c70:4a89:bc61:2] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jb2Yw-0003qK-Pw; Tue, 19 May 2020 13:45:43 +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 16/20] x86: use non-set_fs based maccess routines Date: Tue, 19 May 2020 15:44:45 +0200 Message-Id: <20200519134449.1466624-17-hch@lst.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200519134449.1466624-1-hch@lst.de> References: <20200519134449.1466624-1-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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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..b3e0a56ae961a 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_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(*((type *)(src)), (__force type __user *)(dst), \ + sizeof(type), err_label) + #endif /* _ASM_X86_UACCESS_H */