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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: [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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