linux-kernel - [PATCH 0/2] pstore: Make default pstorefs root dir perms 0750

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Date:   Thu, 10 Aug 2017 13:36:33 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.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>,
        Steven Rostedt <rostedt@...dmis.org>,
        Patrick Tjin <pattjin@...gle.com>,
        Mark Salyzyn <salyzyn@...gle.com>
Subject: [PATCH 0/2] pstore: Make default pstorefs root dir perms 0750

Nick Kralevich pointed out that it was rather problematic to check
capabilities when reading some pstore files. Instead, opt for a more
configurable DAC approach, but retain the general protection by making the
pstorefs root directory mode 0750. It was 0755, but most crash-handlers
will also be performing unlink operations (which DAC would require a
root uid perm for already), so this shouldn't affect anyone, but rather
make permissions more flexible.

-Kees