linux-kernel - Re: [PATCH 2/2] Revert "pstore: Honor dmesg

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Message-ID: <CAGXu5jLtJt1=t7242gU22yf39p-96G+DhLspKEcAgA3q5AFxvQ@mail.gmail.com>
Date:   Tue, 15 Aug 2017 17:29:38 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Nick Kralevich <nnk@...gle.com>,
        Sebastian Schmidt <yath@...h.de>,
        Tony Luck <tony.luck@...el.com>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Patrick Tjin <pattjin@...gle.com>,
        Mark Salyzyn <salyzyn@...gle.com>
Subject: Re: [PATCH 2/2] Revert "pstore: Honor dmesg_restrict sysctl on dmesg dumps"

On Tue, Aug 15, 2017 at 5:21 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> On Thu, 10 Aug 2017 13:36:35 -0700
> Kees Cook <keescook@...omium.org> wrote:
>
>> This reverts commit 68c4a4f8abc60c9440ede9cd123d48b78325f7a3, with
>> various conflict clean-ups.
>>
>> With the default root directory mode set to 0750 now, the capability
>> check was redundant.
>
> What's wrong with redundancy?

In this case, it actually _blocks_ system builders from being able to
define the access controls on pstore. :(

-Kees

-- 
Kees Cook
Pixel Security