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=-13.0 required=3.0 tests=BAYES_00, 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 3C840C433F1 for ; Fri, 24 Jul 2020 01:26:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 21FF822B3F for ; Fri, 24 Jul 2020 01:26:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727905AbgGXB0U (ORCPT ); Thu, 23 Jul 2020 21:26:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38246 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726970AbgGXBZw (ORCPT ); Thu, 23 Jul 2020 21:25:52 -0400 Received: from ZenIV.linux.org.uk (zeniv.linux.org.uk [IPv6:2002:c35c:fd02::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8A174C0619E4; Thu, 23 Jul 2020 18:25:52 -0700 (PDT) Received: from viro by ZenIV.linux.org.uk with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jymT6-001GdN-5z; Fri, 24 Jul 2020 01:25:48 +0000 From: Al Viro To: Linus Torvalds Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Subject: [PATCH v2 14/20] mips: csum_and_copy_{to,from}_user() are never called under KERNEL_DS Date: Fri, 24 Jul 2020 02:25:40 +0100 Message-Id: <20200724012546.302155-14-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200724012546.302155-1-viro@ZenIV.linux.org.uk> References: <20200724012512.GK2786714@ZenIV.linux.org.uk> <20200724012546.302155-1-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 they are only called for iovec-backed iov_iter and under KERNEL_DS an attempt to create such a beast will yield a kvec-backed one. Signed-off-by: Al Viro --- arch/mips/include/asm/checksum.h | 32 +++++++------------------------- 1 file changed, 7 insertions(+), 25 deletions(-) diff --git a/arch/mips/include/asm/checksum.h b/arch/mips/include/asm/checksum.h index b882cacea3ee..5cf4ce11c821 100644 --- a/arch/mips/include/asm/checksum.h +++ b/arch/mips/include/asm/checksum.h @@ -41,22 +41,6 @@ __wsum __csum_partial_copy_from_user(const void *src, void *dst, int len, __wsum sum, int *err_ptr); __wsum __csum_partial_copy_to_user(const void *src, void *dst, int len, __wsum sum, int *err_ptr); -/* - * this is a new version of the above that records errors it finds in *errp, - * but continues and zeros the rest of the buffer. - */ -static inline -__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, - __wsum sum, int *err_ptr) -{ - might_fault(); - if (uaccess_kernel()) - return __csum_partial_copy_kernel((__force void *)src, dst, - len, sum, err_ptr); - else - return __csum_partial_copy_from_user((__force void *)src, dst, - len, sum, err_ptr); -} #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER static inline @@ -65,9 +49,12 @@ __wsum csum_and_copy_from_user(const void __user *src, void *dst, int len) __wsum sum = ~0U; int err = 0; + might_fault(); + if (!access_ok(src, len)) return 0; - sum = csum_partial_copy_from_user(src, dst, len, sum, &err); + sum = __csum_partial_copy_from_user((__force void *)src, dst, + len, sum, &err); return err ? 0 : sum; } @@ -84,14 +71,9 @@ __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len) might_fault(); if (!access_ok(dst, len)) return 0; - if (uaccess_kernel()) - sum = __csum_partial_copy_kernel(src, - (__force void *)dst, - len, sum, &err); - else - sum = __csum_partial_copy_to_user(src, - (__force void *)dst, - len, sum, &err); + sum = __csum_partial_copy_to_user(src, + (__force void *)dst, + len, sum, &err); return err ? 0 : sum; } -- 2.11.0