linux-kernel - Re: [RFC PATCH 3/3a] ptrace: add _ptrace_may

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Message-ID: <20090507085742.GB3036@sequoia.sous-sol.org>
Date:	Thu, 7 May 2009 01:57:42 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>,
	linux-kernel@...r.kernel.org, Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [RFC PATCH 3/3a] ptrace: add _ptrace_may_access()

* Ingo Molnar (mingo@...e.hu) wrote:
> * Oleg Nesterov <oleg@...hat.com> wrote:
> > Agreed, but what about security_operations->ptrace_may_access ?
> > It has the same (bad) name, but returns the error code or 0 on 
> > success.
> 
> Bad code should generally be fixed, or in exceptional circumstances 
> it can tolerated if it's pre-existing bad code, but it should never 
> be propagated. It has not spread _that_ widely yet, and is isolated 
> to the security subsystem:

And the security hooks tend to all follow the 0 success -ve ERR on error.
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