linux-kernel - Re: [kernel-hardening] Re: [PATCH resend 2/2] userns: control capabilities of some user namespaces

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Date:   Thu, 9 Nov 2017 22:46:46 -0600
From:   "Serge E. Hallyn" <serge@...lyn.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Mahesh Bandewar
         (महेश बंडेवार) <maheshb@...gle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Christian Brauner <christian.brauner@...onical.com>,
        Boris Lukashev <blukashev@...pervictus.com>,
        Daniel Micay <danielmicay@...il.com>,
        Mahesh Bandewar <mahesh@...dewar.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>,
        Kernel-hardening <kernel-hardening@...ts.openwall.com>,
        Linux API <linux-api@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [kernel-hardening] Re: [PATCH resend 2/2] userns: control
 capabilities of some user namespaces

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> single sandbox.  I am not at all certain that the capabilities is the
> proper place to limit code reachability.

Right, I keep having this gut feeling that there is another way we
should be doing that.  Maybe based on ksplice or perf, or maybe more
based on subsystems.  And I hope someone pursues that.  But I can't put
my finger on it, and meanwhile the capability checks obviously *are* in
fact gates...

-serge