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=-8.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,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 53AE5C433E0 for ; Wed, 10 Feb 2021 01:20:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F326C64E3B for ; Wed, 10 Feb 2021 01:20:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234898AbhBJBU2 (ORCPT ); Tue, 9 Feb 2021 20:20:28 -0500 Received: from mail.kernel.org ([198.145.29.99]:55704 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233478AbhBIWQY (ORCPT ); Tue, 9 Feb 2021 17:16:24 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6EDD364E56; Tue, 9 Feb 2021 22:15:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1612908926; bh=0/Nk2UkuxA+ITAZU8i4aiVofSUv2nNvX1ns749mDVdU=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=or3bF4mZbUon8GBxxqUQDPJmS4jdw95al2dE5CQxoFPMU6gRPZRfNTrJb8LY9ddaq 3C5hnV+T2CJJN9glfhmapD2ikVa3z1LTfImVtnihe2MpMSdKj+VZV8hABXOqWyTVpJ fHy30qvSV227DtmZB2SxzNQ852WHNT6kRJrdfIfIocRR4h40XsgMC7w5zWZVwCQmBZ NTlSgJNQbtAJfGBneGdNTITWtmhUvNtU53vvZZbOImHAQYP+QYGvXIJDudF11VMic4 gWctk8srlXLQKemh8TYpQMb8cZxVKtr69vA/rnRK/bcol4n+WSIzA8NeplAKnLM4oj rWm6IIC1p0vGQ== Subject: Re: [PATCH][RESEND] lib/vsprintf: make-printk-non-secret printks all addresses as unhashed To: Marco Elver Cc: Petr Mladek , Steven Rostedt , Sergey Senozhatsky , linux-kernel@vger.kernel.org, vbabka@suse.cz, linux-mm@kvack.org, willy@infradead.org, akpm@linux-foundation.org, torvalds@linux-foundation.org, roman.fietze@magna.com, keescook@chromium.org, john.ogness@linutronix.de, akinobu.mita@gmail.com, glider@google.com, andreyknvl@google.com References: <20210202213633.755469-1-timur@kernel.org> From: Timur Tabi Message-ID: <2de3a189-adca-4954-e2a3-c79fbe3eee96@kernel.org> Date: Tue, 9 Feb 2021 16:15:20 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/9/21 3:59 PM, Marco Elver wrote: > Would it be reasonable to make this non-static? Or somehow make it > possible to get this flag from other subsystems? > > There are other places in the kernel that dump sensitive data such as > registers. We'd like to be able to use 'debug_never_hash_pointers' to > decide if our debugging tools can dump registers etc. What we really > need is info if the kernel is in debug mode and we can dump all kinds of > sensitive info; debug_never_hash_pointers is would be a good enough > proxy for that. The next version of my patch (coming soon) will export the symbol. It's intended for test_printf, but if you think it can be used by others, so much the better.