linux-kernel - Re: [PATCH] Trace event for capable().

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Message-ID: <CABsxX9JWK1qVubuYt0+HoZy-Lhz0kp6a3MxyT7ny5YzLS2rMJQ@mail.gmail.com>
Date:	Fri, 18 May 2012 16:09:15 -0700
From:	"Kok, Auke-jan H" <auke-jan.h.kok@...el.com>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
Cc:	Serge Hallyn <serge.hallyn@...onical.com>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, Eric Paris <eparis@...hat.com>
Subject: Re: [PATCH] Trace event for capable().

On Fri, May 18, 2012 at 3:33 PM, richard -rw- weinberger
<richard.weinberger@...il.com> wrote:
>
> On Thu, May 17, 2012 at 9:50 PM, Auke Kok <auke-jan.h.kok@...el.com>
> wrote:
> > Add a simple trace event for capable().
> >
> > There's been a lot of discussion around capable(), and there
> > are plenty of tools to help reduce capabilities' usage from
> > userspace. A major gap however is that it's almost impossible
> > to see or verify which bits are requested from either userspace
> > or in the kernel.
> >
> > This patch adds a minimal tracer that will print out which
> > CAPs are requested and whether the request was granted.
>
> Can we please have support for user namespaces?
> At least idicate whether the current namespace is init_user_ns or not.

that was the main reason for sending this out already - that should be
trivial to add to the trace event, but I haven't looked at namespaces
yet myself. I'll check it out.

Auke
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