linux-kernel - Re: [kernel-hardening] [PATCH 2/2] security: Yama LSM

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Message-ID: <20111219194136.GG12321@outflux.net>
Date:	Mon, 19 Dec 2011 11:41:36 -0800
From:	Kees Cook <keescook@...omium.org>
To:	James Morris <jmorris@...ei.org>
Cc:	kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Roland McGrath <roland@...k.frob.com>
Subject: Re: [kernel-hardening] [PATCH 2/2] security: Yama LSM

Hi James,

On Mon, Dec 19, 2011 at 11:33:10AM +1100, James Morris wrote:
> On Thu, 15 Dec 2011, Kees Cook wrote:
> > +#ifdef CONFIG_SECURITY_YAMA
> > +	ns->ptrace_scope = parent_pid_ns->ptrace_scope;
> > +#endif
> > +
> 
> I'd like to see this implemented as an LSM hook, something like 
> security_ptrace_set_scope().

I must be dense, but I fail to understand the purpose of this. The "ptrace
scope" implemented by Yama is a sysctl, not an system interface. I don't
understand why (or where) other LSMs would want to catch changing this.
Can you explain what you're looking for in more detail?

-Kees

-- 
Kees Cook
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