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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 06A60C2D0F1 for ; Fri, 27 Mar 2020 23:31:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DA7D0206E6 for ; Fri, 27 Mar 2020 23:31:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727486AbgC0XbY (ORCPT ); Fri, 27 Mar 2020 19:31:24 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:35938 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727386AbgC0XbV (ORCPT ); Fri, 27 Mar 2020 19:31:21 -0400 Received: from viro by ZenIV.linux.org.uk with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jHyRb-004KLC-PI; Fri, 27 Mar 2020 23:31:19 +0000 From: Al Viro To: Linus Torvalds Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC][PATCH 13/14] arm: switch to csum_and_copy_from_user() Date: Fri, 27 Mar 2020 23:31:16 +0000 Message-Id: <20200327233117.1031393-13-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200327233117.1031393-1-viro@ZenIV.linux.org.uk> References: <20200327233006.GW23230@ZenIV.linux.org.uk> <20200327233117.1031393-1-viro@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Al Viro Note that csum_partial_copy_from_user() is in assembler here, so I'm leaving it alone and just providing the wrapper for it. When/if we go for switching arm to user_access_{begin,end}() (doing domain switches in those), somebody well need to look into that one. Signed-off-by: Al Viro --- arch/arm/include/asm/checksum.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/arm/include/asm/checksum.h b/arch/arm/include/asm/checksum.h index 20043e0ebb07..ed6073fee338 100644 --- a/arch/arm/include/asm/checksum.h +++ b/arch/arm/include/asm/checksum.h @@ -40,6 +40,20 @@ csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum); __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *err_ptr); +#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER +static inline +__wsum csum_and_copy_from_user (const void __user *src, void *dst, + int len, __wsum sum, int *err_ptr) +{ + if (access_ok(src, len)) + return csum_partial_copy_from_user(src, dst, len, sum, err_ptr); + + if (len) + *err_ptr = -EFAULT; + + return sum; +} + /* * Fold a partial checksum without adding pseudo headers */ -- 2.11.0