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

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Message-ID: <19c1c17e-d0b3-326e-97ec-a4ec1ebee749@kernel.org>
Date:   Wed, 3 Feb 2021 12:58:41 -0600
From:   Timur Tabi <timur@...nel.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     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,
        keescook@...omium.org, 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 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?