linux-kernel - Re: [RFC PATCH v2 2/2] kexec, KEYS: Make use of platform keyring for signature verify

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Date:   Wed, 16 Jan 2019 00:48:46 +0800
From:   Kairui Song <kasong@...hat.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        jwboyer@...oraproject.org, keyrings@...r.kernel.org,
        jmorris@...ei.org, serge@...lyn.com, bauerman@...ux.ibm.com,
        Eric Biggers <ebiggers@...gle.com>, nayna@...ux.ibm.com,
        Dave Young <dyoung@...hat.com>,
        linux-integrity <linux-integrity@...r.kernel.org>,
        kexec@...ts.infradead.org
Subject: Re: [RFC PATCH v2 2/2] kexec, KEYS: Make use of platform keyring for
 signature verify

On Tue, Jan 15, 2019 at 11:47 PM Mimi Zohar <zohar@...ux.ibm.com> wrote:
>
> On Tue, 2019-01-15 at 17:45 +0800, Kairui Song wrote:
>
> > diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
> > index 7d97e432cbbc..a06b04065bb1 100644
> > --- a/arch/x86/kernel/kexec-bzimage64.c
> > +++ b/arch/x86/kernel/kexec-bzimage64.c
> > @@ -534,9 +534,18 @@ static int bzImage64_cleanup(void *loader_data)
> >  #ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
> >  static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
> >  {
> > -     return verify_pefile_signature(kernel, kernel_len,
> > -                                    VERIFY_USE_SECONDARY_KEYRING,
> > -                                    VERIFYING_KEXEC_PE_SIGNATURE);
> > +     int ret;
> > +     ret = verify_pefile_signature(kernel, kernel_len,
> > +                     VERIFY_USE_SECONDARY_KEYRING,
> > +                     VERIFYING_KEXEC_PE_SIGNATURE);
> > +#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
>
> Consider using IS_ENABLED() or IS_BUILTIN().
>
> Mimi

Thanks for the suggestion, will update the patch later if there are no
other comments.

>
> > +     if (ret == -ENOKEY) {
> > +             ret = verify_pefile_signature(kernel, kernel_len,
> > +                             VERIFY_USE_PLATFORM_KEYRING,
> > +                             VERIFYING_KEXEC_PE_SIGNATURE);
> > +     }
> > +#endif
> > +     return ret;
> >  }
> >  #endif
>



--
Best Regards,
Kairui Song