linux-kernel - Re: [PATCH] sh: Stop printing the virtual memory layout

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Date:   Thu, 5 Mar 2020 21:56:15 +0100
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     Tycho Andersen <tycho@...ho.ws>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Joe Perches <joe@...ches.com>,
        Kees Cook <keescook@...omium.org>,
        "Tobin C . Harding" <me@...in.cc>,
        kernel-hardening@...ts.openwall.com,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sh: Stop printing the virtual memory layout



> On Mar 5, 2020, at 9:52 PM, Tycho Andersen <tycho@...ho.ws> wrote:
> 
> On Thu, Mar 05, 2020 at 10:56:29AM -0500, Arvind Sankar wrote:
>>> On Thu, Mar 05, 2020 at 04:49:22PM +0100, John Paul Adrian Glaubitz wrote:
>>> On 3/5/20 4:46 PM, Arvind Sankar wrote:
>>>> Not really too late. I can do s/pr_info/pr_devel and resubmit.
>>>> 
>>>> parisc for eg actually hides this in #if 0 rather than deleting the
>>>> code.
>>>> 
>>>> Kees, you fine with that?
>>> 
>>> But wasn't it removed for all the other architectures already? Or are these
>>> changes not in Linus' tree yet?
>>> 
>>> Adrian
>> 
>> The ones mentioned in the commit message, yes, those are long gone. But
>> I don't see any reason why the remaining ones (there are 6 left that I
>> submitted patches just now for) couldn't switch to pr_devel instead.
> 
> If you do happen to re-send with pr_debug() instead, feel free to add
> my ack to that series as well.

Since it already got removed for most other architectures, I don’t think it makes much sense to keep it for consistency.

I just didn’t understand why it was made configurable for debugging purposes in the first place.

Also, many distributions disable access to the kernel buffer for unprivileged users anyway.

Adrian