linux-kernel - RE: [RFC] vsprintf: compile error on %09pK

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Date:   Tue, 04 Apr 2023 19:12:01 +0900
From:   Jaewon Kim <jaewon31.kim@...sung.com>
To:     David Laight <David.Laight@...LAB.COM>,
        'Jaewon Kim' <jaewon31.kim@...il.com>,
        Petr Mladek <pmladek@...e.com>
CC:     Jaewon Kim <jaewon31.kim@...sung.com>,
        "senozhatsky@...omium.org" <senozhatsky@...omium.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        GyeongHwan Hong <gh21.hong@...sung.com>
Subject: RE: [RFC] vsprintf: compile error on %09pK

>From: Jaewon Kim
>> Sent: 03 April 2023 15:40
>...
>> I wanted to print phys_addr_t  type value only when kptr_restrict sysctl is
>> allowed. So I thought I could use %pK for that purpose. And the physical
>> address is not that long. I wanted to make that length short like 9 hex.
>
>Isn't that is the wrong format for physical addresses anyway?
>They can be larger than virtual ones (eg x86 with PAE).

Yeah, correct. I just used %pK to hide physical address, I thought it could be
leak in security perspective. Could you give me advice how I can hide the
address by default and look the address if kptr_restrict allow it?

Jaewon Kim

>
>	David