linux-kernel - Re: RFC: capabilities(7): notes for kernel developers

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Date:   Thu, 15 Dec 2016 16:31:40 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     Casey Schaufler <casey@...aufler-ca.com>
Cc:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        James Morris <jmorris@...ei.org>,
        Kees Cook <keescook@...omium.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jann Horn <jann@...jh.net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        linux-man <linux-man@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: RFC: capabilities(7): notes for kernel developers

On Thu, Dec 15, 2016 at 12:40 PM, Casey Schaufler
<casey@...aufler-ca.com> wrote:
> On 12/15/2016 11:41 AM, Michael Kerrisk (man-pages) wrote:
>> On 12/15/2016 05:29 PM, Casey Schaufler wrote:
>>> CAP_WAKE_ALARM could readily be CAP_TIME.
>> Actually, I don't quite understand what you mean with that sentence.
>> Could you elaborate?
>
> Should have said CAP_SYS_TIME
>
> Setting an alarm could be considered a time management function,
> depending on what it actually does.

Just a nit here. CAP_WAKE_ALARM is more about the privilege of waking
a system from suspend, while CAP_SYS_TIME covers the ability to set
the time. One wouldn't necessarily want to give applications which
could wake a system up the capability to also set the time.

thanks
-john