linux-kernel - Re: [PATCH v2] ima: add a new CONFIG for loading arch-specific policies

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Message-ID: <1583336133.3284.1.camel@HansenPartnership.com>
Date:   Wed, 04 Mar 2020 07:35:33 -0800
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>, Nayna Jain <nayna@...ux.ibm.com>,
        linux-integrity@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-efi@...r.kernel.org, linux-s390@...r.kernel.org
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Philipp Rudo <prudo@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ima: add a new CONFIG for loading arch-specific
 policies

On Wed, 2020-03-04 at 07:35 -0500, Mimi Zohar wrote:
> On Tue, 2020-03-03 at 23:43 -0800, James Bottomley wrote:
> > On Tue, 2020-03-03 at 21:33 -0500, Nayna Jain wrote:
> > > diff --git a/security/integrity/ima/Kconfig
> > > b/security/integrity/ima/Kconfig
> > > index 3f3ee4e2eb0d..d17972aa413a 100644
> > > --- a/security/integrity/ima/Kconfig
> > > +++ b/security/integrity/ima/Kconfig
> > > @@ -327,3 +327,12 @@ config IMA_QUEUE_EARLY_BOOT_KEYS
> > >  	depends on IMA_MEASURE_ASYMMETRIC_KEYS
> > >  	depends on SYSTEM_TRUSTED_KEYRING
> > >  	default y
> > > +
> > > +config IMA_SECURE_AND_OR_TRUSTED_BOOT
> > > +	bool
> > > +	depends on IMA
> > > +	depends on IMA_ARCH_POLICY
> > > +	default n
> > 
> > You can't do this: a symbol designed to be selected can't depend on
> > other symbols because Kconfig doesn't see the dependencies during
> > select.  We even have a doc for this now:
> > 
> > Documentation/kbuild/Kconfig.select-break
> 
> The document is discussing a circular dependency, where C selects B.
>  IMA_SECURE_AND_OR_TRUSTED_BOOT is not selecting anything, but is
> being selected.  All of the Kconfig's are now dependent on
> IMA_ARCH_POLICY being enabled before selecting
> IMA_SECURE_AND_OR_TRUSTED_BOOT.
> 
> As Ard pointed out, both IMA and IMA_ARCH_POLICY are not needed, as
> IMA_ARCH_POLICY is already dependent on IMA.

Then removing them is fine, if they're not necessary ... you just can't
 select a symbol with dependencies because the two Kconfig mechanisms
don't mix.

James