linux-kernel - Re: [PATCH 1/1] security: introduce file posix caps

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Date:	Tue, 7 Nov 2006 16:06:27 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Stephen Smalley <sds@...ho.nsa.gov>,
	James Morris <jmorris@...ei.org>,
	chris friedhoff <chris@...edhoff.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH 1/1] security: introduce file posix caps

Quoting Seth Arnold (seth.arnold@...e.de):
> On Mon, Nov 06, 2006 at 09:45:50PM -0600, Serge E. Hallyn wrote:
> >  #define CAP_AUDIT_CONTROL    30
> >  
> > +#define CAP_NUMCAPS	     31
> 
> [...]
> 
> > +struct vfs_cap_data_struct {
> > +	__u32 version;
> > +	__u32 effective;
> > +	__u32 permitted;
> > +	__u32 inheritable;
> > +};
> 
> [...]
> 
> > +static int check_cap_sanity(struct vfs_cap_data_struct *cap)
> > +{
> > +	int i;
> > +
> > +	if (cap->version != _LINUX_CAPABILITY_VERSION)
> > +		return -EPERM;
> > +
> > +	for (i=CAP_NUMCAPS; i<sizeof(cap->effective); i++) {
> > +		if (cap->effective & CAP_TO_MASK(i))
> > +			return -EPERM;
> > +	}
> > +	for (i=CAP_NUMCAPS; i<sizeof(cap->permitted); i++) {
> > +		if (cap->permitted & CAP_TO_MASK(i))
> > +			return -EPERM;
> > +	}
> > +	for (i=CAP_NUMCAPS; i<sizeof(cap->inheritable); i++) {
> > +		if (cap->inheritable & CAP_TO_MASK(i))
> > +			return -EPERM;
> > +	}
> > +
> > +	return 0;
> > +}
> 
> for (i=31; i<4; i++) ...
> 
> I'm not sure this checks what you think it checks? :)

Hah!  Thanks for catching that.

I will send a fix out tonight.

-serge
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