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

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Message-ID: <13fdd006-3070-fb6a-cd99-7f845deb6843@kernel.org>
Date:   Thu, 4 Feb 2021 16:20:45 -0600
From:   Timur Tabi <timur@...nel.org>
To:     Kees Cook <keescook@...omium.org>, Pavel Machek <pavel@....cz>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Petr Mladek <pmladek@...e.com>,
        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 2/4/21 4:17 PM, Kees Cook wrote:
> It's just semantics. Printing addresses DOES weaken the security of a
> system, especially when we know attackers have and do use stuff from dmesg
> to tune their attacks. How about "reduces the security of your system"?

I think we're bikeshedding now, but I can replace "compromise" with 
"reduce".

"Kernel memory addresses are exposed, which may reduce the security of 
your system."