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=-19.6 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,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 59CF9C433DB for ; Wed, 10 Feb 2021 21:36:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3359964ED3 for ; Wed, 10 Feb 2021 21:36:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233137AbhBJVfy (ORCPT ); Wed, 10 Feb 2021 16:35:54 -0500 Received: from mail.kernel.org ([198.145.29.99]:56084 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232344AbhBJVfr (ORCPT ); Wed, 10 Feb 2021 16:35:47 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id AD3EB64E66; Wed, 10 Feb 2021 21:35:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1612992906; bh=0CN0AXiGt7nS0p519elCd69YpBiDbXO8I+Tu+S7YevM=; h=From:To:Subject:Date:From; b=GY3Ey79AcOJsn6SXpnwj+p7UeBnWrMw4tW7uB4AfzKlO3ztuZoUCnadvMtyxZYJLS sJDlVXSg7r+H5vr0QYTBqF9XerUDznqFk2C8N0P6EjfqiA598Gb4x+3eY58B2sTXM9 ENa6icxWjUVBuXha3U8rxbjsdUZ286EXmZofloYm7LVZYzC8XfHCcR1Qw3e6r7ETzL cX3wa8lupzQSKpnZTy3icoYluGQQR1DsGxvXoRxqOtZ3ILPb3Z6lBrRHwnqUdp9fm+ p+rRgmz9rjly8IJ92gbXCljl4A0tQRSFG5/WE/ZOi1IoXPnLA+YlXWeKeeR5kTrzGl 9A5EpLLktcJ0w== From: Timur Tabi To: Petr Mladek , Steven Rostedt , Sergey Senozhatsky , Vlastimil Babka , Andy Shevchenko , Matthew Wilcox , akpm@linux-foundation.org, Linus Torvalds , roman.fietze@magna.com, Kees Cook , John Ogness , akinobu.mita@gmail.com, glider@google.com, Andrey Konovalov , Marco Elver , Rasmus Villemoes , Pavel Machek , Tetsuo Handa , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 0/3][v3] add support for never printing hashed addresses Date: Wed, 10 Feb 2021 15:34:50 -0600 Message-Id: <20210210213453.1504219-1-timur@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [The list of email addresses on CC: is getting quite lengthy, so I hope I've included everyone.] Although hashing addresses printed via printk does make the kernel more secure, it interferes with debugging, especially with some functions like print_hex_dump() which always uses hashed addresses. To avoid having to choose between %p and %px, it's easier to add a kernel command line that treats all %p as %px. This encourages developers to use %p more without making debugging more difficult. Patches #1 and #2 upgrade the kselftest framework so that it can report on tests that were skipped outright. This is needed for the test_printf module which will now skip %p hashing tests if hashing is disabled. Patch #2 upgrades the printf library to check the command line. It also updates test_printf(). Full series: Acked-by: Marco Elver Timur Tabi (3): [v3] lib: use KSTM_MODULE_GLOBALS macro in kselftest drivers [v3] kselftest: add support for skipped tests [v3] lib/vsprintf: debug_never_hash_pointers prints all addresses as unhashed .../admin-guide/kernel-parameters.txt | 15 ++++++++ lib/test_bitmap.c | 3 +- lib/test_printf.c | 12 +++++- lib/vsprintf.c | 38 ++++++++++++++++++- tools/testing/selftests/kselftest_module.h | 18 ++++++--- 5 files changed, 74 insertions(+), 12 deletions(-) -- 2.25.1