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=-14.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 CFFC0C433E0 for ; Sun, 14 Feb 2021 16:14:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9AA8E64E61 for ; Sun, 14 Feb 2021 16:14:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229773AbhBNQOf (ORCPT ); Sun, 14 Feb 2021 11:14:35 -0500 Received: from mail.kernel.org ([198.145.29.99]:38902 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229576AbhBNQOd (ORCPT ); Sun, 14 Feb 2021 11:14:33 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 333E264DAD; Sun, 14 Feb 2021 16:13:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1613319232; bh=oHf15gSHKcdfrEuxcuEmshOdx1i9DIeGN5nSxvWb/No=; h=From:To:Subject:Date:From; b=O00k2kQ07nI0dSl2MUzumJwYSH1LWk6XWq2zYi1z1zxrGtqBxnLrwv0udEZb5j/Br xgezU5+xgLN5qGdt9t3IIM8LKMtDC8RNqbJd3Zp/ADvGfYnaZ9DAKG6mBUn+QaNFzB fFF5cHZ+6XRRt97tswNUL6njcYd283UQgEUiJKfdK9fbo5Md8rwDdWpcl2hTScAY9a 0o9rZEnVY63o3OTraf33OKNLxNm4MKVIA1/3iNm3PCqnvrCbntdVCiaqGuG9elHGr8 iduzTsrlfo9/nrbsaXuDnUu8Tkj5gSYo4a/jsV/WVqLRD+ML2wQx9Ab/YnF87eTB7t gWMJ18zYRaraA== 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][v4] add support for never printing hashed addresses Date: Sun, 14 Feb 2021 10:13:45 -0600 Message-Id: <20210214161348.369023-1-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 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(). Timur Tabi (3): [v4] lib: use KSTM_MODULE_GLOBALS macro in kselftest drivers [v4] kselftest: add support for skipped tests [v4] 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