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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 E0822C04AB4 for ; Fri, 17 May 2019 16:48:52 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B0A702166E for ; Fri, 17 May 2019 16:48:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="BCasYiKk"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="PYP/b3+x" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B0A702166E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=cKV1/g2WAA/amDiGjmjdvtagrmvschf2h9CraraLzNc=; b=BCasYiKkCEJRwD YdGJDTXP3WHBa1pKS17Vbq2nYqKm6V4bq6iBL8WjYfEyHwUZUdetSoXcWwZ8+lEqBS2RY9CMFkKPC IvmDbtiQAl9ujNsYyP6i0yxAX2+o/MhDJy0A9O+OlP+nOtuFMUOUkCFUBz0dttJeXOHlXpF0CDz/+ Ja99Wnmf7k7++v9v7Dj7gY4HKt1zk+I50pN+SHU/U63GGBSn4o236iNCJY4+FoG1heeWYYwWL31Oc 9UXOD8RjTLHc/bofmxmyZQPP2M5iiXYMfzpMVNm/h3UoHA9vebkk+DcunMifBRo0kgRnSZ2tHZnGc 33oiQo11HtNePdclDtbA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hRg2G-000061-J1; Fri, 17 May 2019 16:48:44 +0000 Received: from mail-pl1-x642.google.com ([2607:f8b0:4864:20::642]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hRg1T-0007UG-ST for linux-arm-kernel@lists.infradead.org; Fri, 17 May 2019 16:47:58 +0000 Received: by mail-pl1-x642.google.com with SMTP id g5so3608307plt.2 for ; Fri, 17 May 2019 09:47:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=O42F5A4GX0eA84yy8Ef+AkKPQRwJmwFWVhtyExm+PVY=; b=PYP/b3+x4BUW2tXl5EeWPVhQ2Ydr9f0XlD8JFJZdeKuWGUm9x2gBEwCIanOv3mBLby T3lJRIqhz+aMnbrOABRtKWxma2+WZvjeN4x+PFt3loQXcwqG8h15GMZTzENSWae+cGEi HfbFUHK/8IaOWGApHdEcikH6nKx9xsnyyafPQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=O42F5A4GX0eA84yy8Ef+AkKPQRwJmwFWVhtyExm+PVY=; b=Q9Asx1TDQHpdCnqN6cpMhUoKcyJ12oy7Ic0B49KntDk45hMdoq2O3gnudDv7v4k430 NtbuKSyVJZuxdVCOqH8WARFtWhHhRcrrGk4IUUtwBtHmBYQfMXMePEuHqMiCaFKN7W0W lAjwkOik+OPO38lk2HPFN+fGjUD2Ih7TXVy+1EOD9PrZh4pyAYtHXTbMNJDa3PKE6mZ5 fgwTRn4HC0rLjXOD4arTSzzUmIRlVi6qWufOXeek2M95RvC8FdwIs84Vo0ArpGRKr8gt 9oMImrSlfEnMzU04OoimyYlqAVKwjqaJ6iAQeaI3lg215JmbIog6OorTYmq1EFQSePBD hjAQ== X-Gm-Message-State: APjAAAXx9GfAH/NunPiBdeYsJKJCc+65YUK5i17TC16NdExG8avkor3t uzrtpjpbueXn9tywC6tx9fZ/ig== X-Google-Smtp-Source: APXvYqz5grEEF0O5CgARwN/Kl3T5APmZtPmXKSBTqLDuepRs1NbjLFpphhsqHJa3rK39CAOOKrQTJA== X-Received: by 2002:a17:902:968b:: with SMTP id n11mr57741397plp.118.1558111675502; Fri, 17 May 2019 09:47:55 -0700 (PDT) Received: from smtp.gmail.com ([2620:15c:202:1:fa53:7765:582b:82b9]) by smtp.gmail.com with ESMTPSA id l141sm12229810pfd.24.2019.05.17.09.47.54 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 17 May 2019 09:47:55 -0700 (PDT) From: Stephen Boyd To: linux-kernel@vger.kernel.org Subject: [RFC/PATCH 5/5] soc: qcom: cmd-db: Map with read-only mappings Date: Fri, 17 May 2019 09:47:46 -0700 Message-Id: <20190517164746.110786-6-swboyd@chromium.org> X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog In-Reply-To: <20190517164746.110786-1-swboyd@chromium.org> References: <20190517164746.110786-1-swboyd@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190517_094756_128841_7C59FF84 X-CRM114-Status: GOOD ( 14.98 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, Will Deacon , Andy Gross , Evan Green , Bjorn Andersson , Rob Herring , Catalin Marinas , Dan Williams , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org The command DB is read-only already to the kernel because everything is const marked once we map it. Let's go one step further and try to map the memory as read-only in the page tables. This should make it harder for random code to corrupt the database and change the contents. Cc: Evan Green Cc: Rob Herring Cc: Bjorn Andersson Cc: Andy Gross Cc: Will Deacon Cc: Catalin Marinas Cc: Dan Williams Signed-off-by: Stephen Boyd --- drivers/soc/qcom/cmd-db.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/soc/qcom/cmd-db.c b/drivers/soc/qcom/cmd-db.c index 10a34d26b753..6365e8260282 100644 --- a/drivers/soc/qcom/cmd-db.c +++ b/drivers/soc/qcom/cmd-db.c @@ -240,7 +240,8 @@ static int cmd_db_dev_probe(struct platform_device *pdev) { int ret = 0; - cmd_db_header = devm_memremap_reserved_mem(&pdev->dev, MEMREMAP_WB); + cmd_db_header = devm_memremap_reserved_mem(&pdev->dev, + MEMREMAP_RO | MEMREMAP_WB); if (IS_ERR(cmd_db_header)) { ret = PTR_ERR(cmd_db_header); cmd_db_header = NULL; -- Sent by a computer through tubes _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel