From: Marco Elver <elver@google.com>
To: Timur Tabi <timur@kernel.org>
Cc: 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>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Pavel Machek <pavel@ucw.cz>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 0/3][RESEND] add support for never printing hashed addresses
Date: Wed, 10 Feb 2021 12:11:31 +0100 [thread overview]
Message-ID: <YCO/Y8cM/n5YRRJJ@elver.google.com> (raw)
In-Reply-To: <20210210051814.845713-1-timur@kernel.org>
On Tue, Feb 09, 2021 at 11:18PM -0600, Timur Tabi wrote:
> [accidentally sent from the wrong email address, so resending]
>
> [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(-)
I wanted to test this for deciding if we can show sensitive info in
KFENCE reports, which works just fine now that debug_never_hash_pointers
is non-static. FWIW,
Acked-by: Marco Elver <elver@google.com>
But unfortunately this series broke some other test:
| In file included from lib/test_bitmap.c:17:
| lib/test_bitmap.c: In function ‘test_bitmap_init’:
| lib/../tools/testing/selftests/kselftest_module.h:45:48: error: ‘skipped_tests’ undeclared (first use in this function); did you mean ‘failed_tests’?
| 45 | return kstm_report(total_tests, failed_tests, skipped_tests); \
| | ^~~~~~~~~~~~~
| lib/test_bitmap.c:637:1: note: in expansion of macro ‘KSTM_MODULE_LOADERS’
| 637 | KSTM_MODULE_LOADERS(test_bitmap);
| | ^~~~~~~~~~~~~~~~~~~
| lib/../tools/testing/selftests/kselftest_module.h:45:48: note: each undeclared identifier is reported only once for each function it appears in
| 45 | return kstm_report(total_tests, failed_tests, skipped_tests); \
| | ^~~~~~~~~~~~~
| lib/test_bitmap.c:637:1: note: in expansion of macro ‘KSTM_MODULE_LOADERS’
| 637 | KSTM_MODULE_LOADERS(test_bitmap);
| | ^~~~~~~~~~~~~~~~~~~
| lib/../tools/testing/selftests/kselftest_module.h:46:1: error: control reaches end of non-void function [-Werror=return-type]
| 46 | } \
| | ^
| lib/test_bitmap.c:637:1: note: in expansion of macro ‘KSTM_MODULE_LOADERS’
| 637 | KSTM_MODULE_LOADERS(test_bitmap);
| | ^~~~~~~~~~~~~~~~~~~
My allyesconfig build suggests test_bitmap.c is the only one, so it
should probably be fixed up in this series.
Thanks,
-- Marco
next prev parent reply other threads:[~2021-02-10 11:11 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-10 5:18 [PATCH 0/3][RESEND] add support for never printing hashed addresses Timur Tabi
2021-02-10 5:18 ` [PATCH 1/3] lib/test_printf: use KSTM_MODULE_GLOBALS macro Timur Tabi
2021-02-10 5:21 ` Timur Tabi
2021-02-10 13:14 ` Petr Mladek
2021-02-10 5:18 ` [PATCH 2/3] kselftest: add support for skipped tests Timur Tabi
2021-02-10 5:18 ` [PATCH 3/3] lib/vsprintf: make-printk-non-secret printks all addresses as unhashed Timur Tabi
2021-02-10 11:03 ` Vlastimil Babka
2021-02-10 13:41 ` Petr Mladek
2021-02-10 17:27 ` Timur Tabi
2021-02-12 11:52 ` Petr Mladek
2021-02-10 11:11 ` Marco Elver [this message]
2021-02-10 19:03 ` [PATCH 0/3][RESEND] add support for never printing hashed addresses Timur Tabi
2021-02-10 11:47 ` Andy Shevchenko
2021-02-10 16:57 ` Timur Tabi
2021-02-10 15:46 ` Tetsuo Handa
2021-02-10 16:18 ` Steven Rostedt
2021-02-10 16:39 ` Tetsuo Handa
2021-02-10 16:46 ` Steven Rostedt
2021-02-10 17:07 ` Tetsuo Handa
2021-02-10 17:29 ` Steven Rostedt
2021-02-10 17:21 ` Timur Tabi
2021-02-10 16:54 ` Andy Shevchenko
2021-02-10 17:41 ` Tetsuo Handa
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