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=-9.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,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 67848C4363D for ; Fri, 25 Sep 2020 15:54:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A71C21D91 for ; Fri, 25 Sep 2020 15:54:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=codeweavers.com header.i=@codeweavers.com header.b="syJkk2dn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729403AbgIYPyO (ORCPT ); Fri, 25 Sep 2020 11:54:14 -0400 Received: from mail.codeweavers.com ([50.203.203.244]:42770 "EHLO mail.codeweavers.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728842AbgIYPyN (ORCPT ); Fri, 25 Sep 2020 11:54:13 -0400 X-Greylist: delayed 1026 seconds by postgrey-1.27 at vger.kernel.org; Fri, 25 Sep 2020 11:54:13 EDT DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=codeweavers.com; s=6377696661; h=Content-Transfer-Encoding:MIME-Version: Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=AIt158zG6UrFe+7u3ioemv3NfqN1fmnQVECYXJh2LR0=; b=syJkk2dnWCoUhtN8IZ6cqFKR+s wOUqxjL1oWSw21XLUmaVVlxsjILZHDJVNRF0Jf93ZFAZDlDyDoV7YJKh26tEN0/epPbmwfYMGeUA4 7I/Jitsi24HpOh/cpRgOSyjHm5APTsLaSZIrVlvQnbX44/bzC/23tAJOh8jO6p8jom8c=; Received: from pool-72-73-20-93.clppva.fios.verizon.net ([72.73.20.93] helo=derek-personal-arch.fios-router.home) by mail.codeweavers.com with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kLpmT-0007N8-Gk; Fri, 25 Sep 2020 10:37:07 -0500 From: Derek Lesho To: linux-kernel@vger.kernel.org Cc: Derek Lesho Subject: [RFC] mm: Allow 64-bit mmap syscalls to access higher addresses. Date: Fri, 25 Sep 2020 10:37:03 -0500 Message-Id: <20200925153703.288236-1-dlesho@codeweavers.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For those curious about my usecase, I'm working on running some windows 64-bit driver code in context of any given process. I accomplish this by mapping some of the fake kernel bits in the target process, and running the code in a dedicated thread. --- mm/mmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 40248d84ad5f..3a6940ef6128 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2240,7 +2240,7 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, if (IS_ERR_VALUE(addr)) return addr; - if (addr > TASK_SIZE - len) + if (addr > TASK_SIZE_MAX - len) return -ENOMEM; if (offset_in_page(addr)) return -EINVAL; @@ -2767,7 +2767,7 @@ int __do_munmap(struct mm_struct *mm, unsigned long start, size_t len, unsigned long end; struct vm_area_struct *vma, *prev, *last; - if ((offset_in_page(start)) || start > TASK_SIZE || len > TASK_SIZE-start) + if ((offset_in_page(start)) || start > TASK_SIZE_MAX || len > TASK_SIZE_MAX-start) return -EINVAL; len = PAGE_ALIGN(len); -- 2.28.0