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

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Date:   Tue, 9 Feb 2021 16:15:20 -0600
From:   Timur Tabi <timur@...nel.org>
To:     Marco Elver <elver@...gle.com>
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,
        keescook@...omium.org, john.ogness@...utronix.de,
        akinobu.mita@...il.com, glider@...gle.com, andreyknvl@...gle.com
Subject: Re: [PATCH][RESEND] lib/vsprintf: make-printk-non-secret printks all
 addresses as unhashed



On 2/9/21 3:59 PM, Marco Elver wrote:
> Would it be reasonable to make this non-static? Or somehow make it
> possible to get this flag from other subsystems?
> 
> There are other places in the kernel that dump sensitive data such as
> registers. We'd like to be able to use 'debug_never_hash_pointers' to
> decide if our debugging tools can dump registers etc. What we really
> need is info if the kernel is in debug mode and we can dump all kinds of
> sensitive info; debug_never_hash_pointers is would be a good enough
> proxy for that.

The next version of my patch (coming soon) will export the symbol.  It's 
intended for test_printf, but if you think it can be used by others, so 
much the better.