[PATCH v4 1/3] efi: generalize efi_get_secureboot

[Ard Biesheuvel]

On Tue, 3 Nov 2020 at 19:49, Mimi Zohar <zohar at linux.ibm.com> wrote:
>
> On Mon, 2020-11-02 at 23:37 +0100, Ard Biesheuvel wrote:
> > From: Chester Lin <clin at suse.com>
> >
> > Generalize the efi_get_secureboot() function so not only efistub but also
> > other subsystems can use it.
> >
> > Note that the MokSbState handling is not factored out: the variable is
> > boot time only, and so it cannot be parameterized as easily. Also, the
> > IMA code will switch to this version in a future patch, and it does not
> > incorporate the MokSbState exception in the first place.
> >
> > Note that the new efi_get_secureboot_mode() helper treats any failures
> > to read SetupMode as setup mode being disabled.
> >
> > Co-developed-by: Chester Lin <clin at suse.com>
> > Signed-off-by: Chester Lin <clin at suse.com>
> > Signed-off-by: Ard Biesheuvel <ardb at kernel.org>
>
> Thanks, Ard.  Other than one minor thing inline below, the patch looks
> good.  I haven't done any testing yet.
>
> > diff --git a/include/linux/efi.h b/include/linux/efi.h
> > index bd9d83a94173..79b2d4de62e0 100644
> > --- a/include/linux/efi.h
> > +++ b/include/linux/efi.h
> > @@ -1082,7 +1082,28 @@ enum efi_secureboot_mode {
> >       efi_secureboot_mode_disabled,
> >       efi_secureboot_mode_enabled,
> >  };
> > -enum efi_secureboot_mode efi_get_secureboot(void);
> > +
> > +static inline
> > +enum efi_secureboot_mode efi_get_secureboot_mode(efi_get_variable_t *get_var)
>
> get_var() should be defined as "efi_status_t".   If this is being
> upstreamed via integrity, I can make the change.
>

No, get_var is a pointer to a function returning efi_status_t, check
include/linux/efi.h for details.