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=-5.5 required=3.0 tests=MAILING_LIST_MULTI, SIGNED_OFF_BY,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 487B0C433DF for ; Thu, 18 Jun 2020 11:47:35 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id ED61B207D8 for ; Thu, 18 Jun 2020 11:47:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ED61B207D8 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 3D3F98D000D; Thu, 18 Jun 2020 07:47:34 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 384DF8D0001; Thu, 18 Jun 2020 07:47:34 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 298A08D000D; Thu, 18 Jun 2020 07:47:34 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0134.hostedemail.com [216.40.44.134]) by kanga.kvack.org (Postfix) with ESMTP id 13E3D8D0001 for ; Thu, 18 Jun 2020 07:47:34 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id A91D98248076 for ; Thu, 18 Jun 2020 11:47:33 +0000 (UTC) X-FDA: 76942157586.20.view13_0600dd526e10 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin20.hostedemail.com (Postfix) with ESMTP id 85212180C07AB for ; Thu, 18 Jun 2020 11:47:33 +0000 (UTC) X-HE-Tag: view13_0600dd526e10 X-Filterd-Recvd-Size: 3291 Received: from mail-wm1-f67.google.com (mail-wm1-f67.google.com [209.85.128.67]) by imf35.hostedemail.com (Postfix) with ESMTP for ; Thu, 18 Jun 2020 11:47:33 +0000 (UTC) Received: by mail-wm1-f67.google.com with SMTP id l26so4881851wme.3 for ; Thu, 18 Jun 2020 04:47:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to:user-agent; bh=cFsUtUBh9aNFVLDZvQX6B8teUAK1O+/w59Gia3tUevI=; b=Z088usGEmukCFIlg2cC6pPOEsterCJ2TMnlrTeWm3ZDrYs/Ev5/F2dZTc3Rdht0c0l 7CtV2Zt3L2vcJrfCYBaa2MB1cThiA9GY+M3dcxd09DTZO2VKMsg6T3MYCCvvdKy6NH/h RgqeCPINZtYCvLoMDvyqoVN3eKeCejRwNRduHcL5XkUJ3X8UE9vz71t42iCKB79ayj2G 6vPGGUqOBHV4MGoWL4s+AsGMdFzGQcoAvBan6Tmj/QwBCyDhqu1QNtGA/MigRlrmAUkl IR4oItCGiD+De3pcJSZPbXL7DeqZ+YalgLv2ADzdGrJLqRxPYTv3w8wsXg6dfl/iiaVA I6GQ== X-Gm-Message-State: AOAM533SQ5nXssmUOn9zAYCdQz15bhM2zG7H42HehZoTL8y/FLCD86Wn HmXNK/QeYtuEyC/kX1unX0c= X-Google-Smtp-Source: ABdhPJwS415YB/rJb+NXaXvRVl2d4Aq2pYtG+WgCBUB3ffY8PwvYaxMgTUxFb9zCbuYH2eSiqEaltQ== X-Received: by 2002:a1c:3b43:: with SMTP id i64mr3792942wma.112.1592480852025; Thu, 18 Jun 2020 04:47:32 -0700 (PDT) Received: from liuwe-devbox-debian-v2 ([51.145.34.42]) by smtp.gmail.com with ESMTPSA id u7sm3299615wrm.23.2020.06.18.04.47.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Jun 2020 04:47:31 -0700 (PDT) Date: Thu, 18 Jun 2020 11:47:29 +0000 From: Wei Liu To: Christoph Hellwig Cc: Andrew Morton , Dexuan Cui , Vitaly Kuznetsov , Peter Zijlstra , Catalin Marinas , Will Deacon , Jessica Yu , x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-mm@kvack.org, Wei Liu Subject: Re: [PATCH 1/3] x86/hyperv: allocate the hypercall page with only read and execute bits Message-ID: <20200618114729.bnut7gbj2j4uhjnc@liuwe-devbox-debian-v2> References: <20200618064307.32739-1-hch@lst.de> <20200618064307.32739-2-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20200618064307.32739-2-hch@lst.de> User-Agent: NeoMutt/20180716 X-Rspamd-Queue-Id: 85212180C07AB X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 Content-Transfer-Encoding: quoted-printable 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 Thu, Jun 18, 2020 at 08:43:05AM +0200, Christoph Hellwig wrote: > Avoid a W^X violation cause by the fact that PAGE_KERNEL_EXEC includes = the > writable bit. >=20 > For this resurrect the removed PAGE_KERNEL_RX definit=D1=96on, but as > PAGE_KERNEL_ROX to match arm64 and powerpc. >=20 > Fixes: 78bb17f76edc ("x86/hyperv: use vmalloc_exec for the hypercall pa= ge") > Reported-by: Dexuan Cui > Signed-off-by: Christoph Hellwig > Tested-by: Vitaly Kuznetsov Acked-by: Wei Liu