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

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Date:   Tue, 2 Feb 2021 16:19:20 -0600
From:   Timur Tabi <timur@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        willy@...radead.org, akpm@...ux-foundation.org,
        torvalds@...ux-foundation.org, roman.fietze@...na.com,
        john.ogness@...utronix.de, akinobu.mita@...il.com
Subject: Re: [PATCH] lib/vsprintf: make-printk-non-secret printks all
 addresses as unhashed

On 2/2/21 3:52 PM, Kees Cook wrote:
>> A large warning message is displayed if this option is enabled,
>> because unhashed addresses, while useful for debugging, exposes
>> kernel addresses which can be a security risk.

> Linus has expressly said "no" to things like this in the past:
> https://lore.kernel.org/lkml/CA+55aFwieC1-nAs+NFq9RTwaR8ef9hWa4MjNBWL41F-8wM49eA@mail.gmail.com/
Maybe I misunderstood, but I thought this is what Vlastimil, Petr, 
Sergey, John, and Steven asked for.