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=-17.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 40489C433DB for ; Fri, 22 Jan 2021 12:59:10 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7FD3223106 for ; Fri, 22 Jan 2021 12:59:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7FD3223106 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 801506B000A; Fri, 22 Jan 2021 07:59:08 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 76E526B000E; Fri, 22 Jan 2021 07:59:08 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 684766B000C; Fri, 22 Jan 2021 07:59:08 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0121.hostedemail.com [216.40.44.121]) by kanga.kvack.org (Postfix) with ESMTP id 4DE416B000A for ; Fri, 22 Jan 2021 07:59:08 -0500 (EST) Received: from smtpin23.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 0E7D3181AF5E6 for ; Fri, 22 Jan 2021 12:59:08 +0000 (UTC) X-FDA: 77733416376.23.color04_071358a2756c Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin23.hostedemail.com (Postfix) with ESMTP id E01FE37604; Fri, 22 Jan 2021 12:59:07 +0000 (UTC) X-HE-Tag: color04_071358a2756c X-Filterd-Recvd-Size: 3034 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf11.hostedemail.com (Postfix) with ESMTP; Fri, 22 Jan 2021 12:59:07 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 16C16230FC; Fri, 22 Jan 2021 12:59:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1611320346; bh=KOC8i4h1phIqdtjvrL9AXOG1eCZg1fJIiF3yQKhxk/w=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=XKwMLC7OELm1PbA4JHPkLogTkoeY7R76FpH0BAn7Ij2QjRx7SUJgilab19RUDzBY2 ekl0NLm2XESpjNZs48mIRcmB7L8Ye+RjI1Wj3SAAFLoI7m5rXPBAgvZZimJmmB0Nlr I8lbf5rObXUcg3OT7WUgkXnw8TWOCy6KgvjHQhQ9obeL/KDb6nXGa6dPqx7vPkN8Rj 22VOj370oOZQh5t5OQwMZWOMNk3VmbjwJWatKGkxEgdGTRSXjwx4+zLRz06Yq9i8i8 IXkwpi7O8D7aN/KibydQfqrjQJqkRjZKEAOFpm10/90zwkcNOR4+kDPmcrp3nuNSTO RSPWPXMyMKZtA== Date: Fri, 22 Jan 2021 12:58:58 +0000 From: Will Deacon To: Dmitry Safonov Cc: linux-kernel@vger.kernel.org, Dmitry Safonov <0x7f454c46@gmail.com>, Alexander Viro , Andrew Morton , Andy Lutomirski , Brian Geffon , Catalin Marinas , Dan Williams , Dave Jiang , Hugh Dickins , Ingo Molnar , "Kirill A. Shutemov" , Mike Kravetz , Minchan Kim , Russell King , Thomas Bogendoerfer , Thomas Gleixner , Vishal Verma , Vlastimil Babka , linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 6/6] mm: Forbid splitting special mappings Message-ID: <20210122125858.GC24102@willie-the-truck> References: <20201013013416.390574-1-dima@arista.com> <20201013013416.390574-7-dima@arista.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201013013416.390574-7-dima@arista.com> User-Agent: Mutt/1.10.1 (2018-07-13) 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: On Tue, Oct 13, 2020 at 02:34:16AM +0100, Dmitry Safonov wrote: > Don't allow splitting of vm_special_mapping's. > It affects vdso/vvar areas. Uprobes have only one page in xol_area so > they aren't affected. > > Those restrictions were enforced by checks in .mremap() callbacks. > Restrict resizing with generic .split() callback. > > Signed-off-by: Dmitry Safonov > --- > arch/arm/kernel/vdso.c | 9 --------- > arch/arm64/kernel/vdso.c | 41 +++------------------------------------ > arch/mips/vdso/genvdso.c | 4 ---- > arch/s390/kernel/vdso.c | 11 +---------- > arch/x86/entry/vdso/vma.c | 17 ---------------- > mm/mmap.c | 12 ++++++++++++ > 6 files changed, 16 insertions(+), 78 deletions(-) For arm64: Acked-by: Will Deacon Will