linux-kernel - Re: [PATCH][RESEND] lib/vsprintf: make-printk-non-secret printks all addresses as unhashed

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Message-ID: <202102031201.FFED9547D@keescook>
Date:   Wed, 3 Feb 2021 12:02:05 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Timur Tabi <timur@...nel.org>
Cc:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-kernel@...r.kernel.org, vbabka@...e.cz, linux-mm@...ck.org,
        willy@...radead.org, akpm@...ux-foundation.org,
        torvalds@...ux-foundation.org, roman.fietze@...na.com,
        john.ogness@...utronix.de,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        akinobu.mita@...il.com
Subject: Re: [PATCH][RESEND] lib/vsprintf: make-printk-non-secret printks all
 addresses as unhashed

On Wed, Feb 03, 2021 at 12:58:41PM -0600, Timur Tabi wrote:
> On 2/3/21 7:31 AM, Petr Mladek wrote:
> > Also please make sure that lib/test_printf.c will work with
> > the new option.
> 
> As you suspected, it doesn't work:
> 
> [  206.966478] test_printf: loaded.
> [  206.966528] test_printf: plain 'p' does not appear to be hashed
> [  206.966740] test_printf: failed 1 out of 388 tests
> 
> What should I do about this?
> 
> On one hand, it is working as expected: %p is not hashed, and that should be
> a warning.
> 
> On the other hand, maybe test_printf should be aware of the command line
> parameter and test to make sure that %p is NOT hashed?

It seems like it'd be best for the test to fail, yes? It _is_ a problem
that %p is unhashed; it's just that the failure was intended.

-- 
Kees Cook