linux-kernel - Re: [PATCH 0/3][v3] add support for never printing hashed addresses

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Message-ID: <YCUKqUc8GNjZLI16@smile.fi.intel.com>
Date:   Thu, 11 Feb 2021 12:44:57 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Timur Tabi <timur@...nel.org>
Cc:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        akpm@...ux-foundation.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        roman.fietze@...na.com, Kees Cook <keescook@...omium.org>,
        John Ogness <john.ogness@...utronix.de>,
        akinobu.mita@...il.com, glider@...gle.com,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Pavel Machek <pavel@....cz>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 0/3][v3] add support for never printing hashed addresses

On Wed, Feb 10, 2021 at 03:34:50PM -0600, Timur Tabi wrote:
> [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().

Side note to the future contributions.

> Full series:
> 
> Acked-by: Marco Elver <elver@...gle.com>

That's what you usually add to each patch in the series individually.
You may use simple oneliner for this, i.e. `git filter-branch --msg-filter ...`

-- 
With Best Regards,
Andy Shevchenko