From: Timur Tabi <ttabi@nvidia.com>
To: Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Vlastimil Babka <vbabka@suse.cz>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Matthew Wilcox <willy@infradead.org>, <akpm@linux-foundation.org>,
"Linus Torvalds" <torvalds@linux-foundation.org>,
<roman.fietze@magna.com>, "Kees Cook" <keescook@chromium.org>,
John Ogness <john.ogness@linutronix.de>, <akinobu.mita@gmail.com>,
<glider@google.com>, Andrey Konovalov <andreyknvl@google.com>,
Marco Elver <elver@google.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Pavel Machek <pavel@ucw.cz>, <linux-kernel@vger.kernel.org>,
<linux-mm@kvack.org>
Subject: [PATCH 0/3] add support for never printing hashed addresses
Date: Tue, 9 Feb 2021 23:05:26 -0600 [thread overview]
Message-ID: <20210210050529.843005-1-ttabi@nvidia.com> (raw)
[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().
Timur Tabi (3):
lib/test_printf: use KSTM_MODULE_GLOBALS macro
kselftest: add support for skipped tests
[v2] lib/vsprintf: make-printk-non-secret printks all addresses as
unhashed
.../admin-guide/kernel-parameters.txt | 15 +++++++
lib/test_printf.c | 12 +++++-
lib/vsprintf.c | 40 ++++++++++++++++++-
tools/testing/selftests/kselftest_module.h | 18 ++++++---
4 files changed, 75 insertions(+), 10 deletions(-)
--
2.25.1
next reply other threads:[~2021-02-10 5:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-10 5:05 Timur Tabi [this message]
2021-02-10 5:05 ` [PATCH 1/3] lib/test_printf: use KSTM_MODULE_GLOBALS macro Timur Tabi
2021-02-10 5:05 ` [PATCH 2/3] kselftest: add support for skipped tests Timur Tabi
2021-02-10 5:05 ` [PATCH 3/3] [v2] lib/vsprintf: make-printk-non-secret printks all addresses as unhashed Timur Tabi
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