linux-kernel - RE: [PATCH] ACPI / sysfs: Extend ACPI sysfs to provide access to boot error region

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Date:   Fri, 18 Aug 2017 02:12:50 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Alan Cox <gnomes@...rguk.ukuu.org.uk>
CC:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Boris Petkov <bp@...e.de>,
        Tyler Baicar <tbaicar@...eaurora.org>,
        "Punit Agrawal" <punit.agrawal@....com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] ACPI / sysfs: Extend ACPI sysfs to provide access to
 boot error region

> Should this not also have a capability check. Assuming file permissions
> are sufficient for grabbing a chunk of system memory holding error
> info doesn't seem too scary but it's at odds with a lot of other cases ?

At least one of those other cases (pstore) added a capability check and now regret
it.  There's a thread on reverting it. Look for:

   Revert "pstore: Honor dmesg_restrict sysctl on dmesg dumps"

-Tony