[PATCH] KEYS: trusted: Fix trusted key backends when building as module

[PATCH] KEYS: trusted: Fix trusted key backends when building as module

[Andreas Rammhold]

Before this commit the kernel could end up with no trusted key sources
even thought both of the currently supported backends (tpm & tee) were
compoiled as modules. This manifested in the trusted key type not being
registered at all.

When checking if a CONFIG_… preprocessor variable is defined we only
test for the builtin (=y) case and not the module (=m) case. By using
the IS_ENABLE(…) macro we to test for both cases.

Signed-off-by: Andreas Rammhold <andreas@rammhold.de>
---
 security/keys/trusted-keys/trusted_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
index d5c891d8d353..fd640614b168 100644
--- a/security/keys/trusted-keys/trusted_core.c
+++ b/security/keys/trusted-keys/trusted_core.c
@@ -27,10 +27,10 @@ module_param_named(source, trusted_key_source, charp, 0);
 MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
 
 static const struct trusted_key_source trusted_key_sources[] = {
-#if defined(CONFIG_TCG_TPM)
+#if IS_ENABLED(CONFIG_TCG_TPM)
 	{ "tpm", &trusted_key_tpm_ops },
 #endif
-#if defined(CONFIG_TEE)
+#if IS_ENABLED(CONFIG_TEE)
 	{ "tee", &trusted_key_tee_ops },
 #endif
 };
-- 
2.32.0

Re: [PATCH] KEYS: trusted: Fix trusted key backends when building as module

[Sumit Garg]

On Fri, 16 Jul 2021 at 13:54, Andreas Rammhold <andreas@rammhold.de> wrote:
>
> Before this commit the kernel could end up with no trusted key sources
> even thought both of the currently supported backends (tpm & tee) were

s/thought/though/

> compoiled as modules. This manifested in the trusted key type not being

s/compoiled/compiled/

> registered at all.
>
> When checking if a CONFIG_… preprocessor variable is defined we only
> test for the builtin (=y) case and not the module (=m) case. By using
> the IS_ENABLE(…) macro we to test for both cases.
>

s/to/do/

> Signed-off-by: Andreas Rammhold <andreas@rammhold.de>
> ---
>  security/keys/trusted-keys/trusted_core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>

Apart from minor nits above, add a corresponding fixes tag. With that:

Reviewed-by: Sumit Garg <sumit.garg@linaro.org>

-Sumit

> diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
> index d5c891d8d353..fd640614b168 100644
> --- a/security/keys/trusted-keys/trusted_core.c
> +++ b/security/keys/trusted-keys/trusted_core.c
> @@ -27,10 +27,10 @@ module_param_named(source, trusted_key_source, charp, 0);
>  MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
>
>  static const struct trusted_key_source trusted_key_sources[] = {
> -#if defined(CONFIG_TCG_TPM)
> +#if IS_ENABLED(CONFIG_TCG_TPM)
>         { "tpm", &trusted_key_tpm_ops },
>  #endif
> -#if defined(CONFIG_TEE)
> +#if IS_ENABLED(CONFIG_TEE)
>         { "tee", &trusted_key_tee_ops },
>  #endif
>  };
> --
> 2.32.0
>

Re: [PATCH] KEYS: trusted: Fix trusted key backends when building as module

[Ahmad Fatoum]

Hello Andreas,

On 16.07.21 10:17, Andreas Rammhold wrote:
> Before this commit the kernel could end up with no trusted key sources
> even thought both of the currently supported backends (tpm & tee) were
> compoiled as modules. This manifested in the trusted key type not being
> registered at all.

I assume (TPM) trusted key module use worked before the TEE rework? If so,

an appropriate Fixes: Tag would then be in order.

> When checking if a CONFIG_… preprocessor variable is defined we only
> test for the builtin (=y) case and not the module (=m) case. By using
> the IS_ENABLE(…) macro we to test for both cases.

It looks to me like you could now provoke a link error if TEE is a module
and built-in trusted key core tries to link against trusted_key_tee_ops.

One solution for that IS_REACHABLE(). Another is to address the root cause,
which is the inflexible trusted keys Kconfig description:

- Trusted keys despite TEE support can still only be built when TCG_TPM is enabled
- There is no support to have TEE or TPM enabled without using those for
  enabled trusted keys as well
- As you noticed, module build of the backend has issues

I addressed these three issues in a patch[1], a month ago, but have yet to
receive feedback.

[1]: https://lore.kernel.org/linux-integrity/f8285eb0135ba30c9d846cf9dd395d1f5f8b1efc.1624364386.git-series.a.fatoum@pengutronix.de/

Cheers,
Ahmad

> Signed-off-by: Andreas Rammhold <andreas@rammhold.de>
> ---
>  security/keys/trusted-keys/trusted_core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
> index d5c891d8d353..fd640614b168 100644
> --- a/security/keys/trusted-keys/trusted_core.c
> +++ b/security/keys/trusted-keys/trusted_core.c
> @@ -27,10 +27,10 @@ module_param_named(source, trusted_key_source, charp, 0);
>  MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
>  
>  static const struct trusted_key_source trusted_key_sources[] = {
> -#if defined(CONFIG_TCG_TPM)
> +#if IS_ENABLED(CONFIG_TCG_TPM)
>  	{ "tpm", &trusted_key_tpm_ops },
>  #endif
> -#if defined(CONFIG_TEE)
> +#if IS_ENABLED(CONFIG_TEE)
>  	{ "tee", &trusted_key_tee_ops },
>  #endif
>  };
> 


-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH] KEYS: trusted: Fix trusted key backends when building as module

[Sumit Garg]

On Mon, 19 Jul 2021 at 12:40, Ahmad Fatoum <a.fatoum@pengutronix.de> wrote:
>
> Hello Andreas,
>
> On 16.07.21 10:17, Andreas Rammhold wrote:
> > Before this commit the kernel could end up with no trusted key sources
> > even thought both of the currently supported backends (tpm & tee) were
> > compoiled as modules. This manifested in the trusted key type not being
> > registered at all.
>
> I assume (TPM) trusted key module use worked before the TEE rework? If so,
>
> an appropriate Fixes: Tag would then be in order.
>
> > When checking if a CONFIG_… preprocessor variable is defined we only
> > test for the builtin (=y) case and not the module (=m) case. By using
> > the IS_ENABLE(…) macro we to test for both cases.
>
> It looks to me like you could now provoke a link error if TEE is a module
> and built-in trusted key core tries to link against trusted_key_tee_ops.
>

That's true.

> One solution for that IS_REACHABLE(). Another is to address the root cause,
> which is the inflexible trusted keys Kconfig description:
>
> - Trusted keys despite TEE support can still only be built when TCG_TPM is enabled
> - There is no support to have TEE or TPM enabled without using those for
>   enabled trusted keys as well
> - As you noticed, module build of the backend has issues
>
> I addressed these three issues in a patch[1], a month ago, but have yet to
> receive feedback.

That's an oversight on my part since this patch was part of the new
CAAM trust source patch-set. Although I do admit that it was on my
TODO list. So I have provided some feedback on that patch. Can you
post the next version as an independent fix patch?

-Sumit

>
> [1]: https://lore.kernel.org/linux-integrity/f8285eb0135ba30c9d846cf9dd395d1f5f8b1efc.1624364386.git-series.a.fatoum@pengutronix.de/
>
> Cheers,
> Ahmad
>
> > Signed-off-by: Andreas Rammhold <andreas@rammhold.de>
> > ---
> >  security/keys/trusted-keys/trusted_core.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
> > index d5c891d8d353..fd640614b168 100644
> > --- a/security/keys/trusted-keys/trusted_core.c
> > +++ b/security/keys/trusted-keys/trusted_core.c
> > @@ -27,10 +27,10 @@ module_param_named(source, trusted_key_source, charp, 0);
> >  MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
> >
> >  static const struct trusted_key_source trusted_key_sources[] = {
> > -#if defined(CONFIG_TCG_TPM)
> > +#if IS_ENABLED(CONFIG_TCG_TPM)
> >       { "tpm", &trusted_key_tpm_ops },
> >  #endif
> > -#if defined(CONFIG_TEE)
> > +#if IS_ENABLED(CONFIG_TEE)
> >       { "tee", &trusted_key_tee_ops },
> >  #endif
> >  };
> >
>
>
> --
> Pengutronix e.K.                           |                             |
> Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
> 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: [PATCH] KEYS: trusted: Fix trusted key backends when building as module

[andreas]

On 13:36 19.07.21, Sumit Garg wrote:
> On Mon, 19 Jul 2021 at 12:40, Ahmad Fatoum <a.fatoum@pengutronix.de> wrote:
> >
> > Hello Andreas,
> >
> > On 16.07.21 10:17, Andreas Rammhold wrote:
> > > Before this commit the kernel could end up with no trusted key sources
> > > even thought both of the currently supported backends (tpm & tee) were
> > > compoiled as modules. This manifested in the trusted key type not being
> > > registered at all.
> >
> > I assume (TPM) trusted key module use worked before the TEE rework? If so,
> >
> > an appropriate Fixes: Tag would then be in order.
> >
> > > When checking if a CONFIG_… preprocessor variable is defined we only
> > > test for the builtin (=y) case and not the module (=m) case. By using
> > > the IS_ENABLE(…) macro we to test for both cases.
> >
> > It looks to me like you could now provoke a link error if TEE is a module
> > and built-in trusted key core tries to link against trusted_key_tee_ops.
> >
> 
> That's true.
> 
> > One solution for that IS_REACHABLE(). Another is to address the root cause,
> > which is the inflexible trusted keys Kconfig description:
> >
> > - Trusted keys despite TEE support can still only be built when TCG_TPM is enabled
> > - There is no support to have TEE or TPM enabled without using those for
> >   enabled trusted keys as well
> > - As you noticed, module build of the backend has issues
> >
> > I addressed these three issues in a patch[1], a month ago, but have yet to
> > receive feedback.
> 
> That's an oversight on my part since this patch was part of the new
> CAAM trust source patch-set. Although I do admit that it was on my
> TODO list. So I have provided some feedback on that patch. Can you
> post the next version as an independent fix patch?

Thank you both for the feedback. In light of thes feedback and the
patchset that Ahmad posted I'll not address the issue and not send a v2
of this.

I'll try to squeeze in some time to test the other patch and provide
feedback.

Andi

Re: [PATCH] KEYS: trusted: Fix trusted key backends when building as module

[Jarkko Sakkinen]

On Mon, Jul 19, 2021 at 09:10:01AM +0200, Ahmad Fatoum wrote:
> Hello Andreas,
> 
> On 16.07.21 10:17, Andreas Rammhold wrote:
> > Before this commit the kernel could end up with no trusted key sources
> > even thought both of the currently supported backends (tpm & tee) were
> > compoiled as modules. This manifested in the trusted key type not being
> > registered at all.
> 
> I assume (TPM) trusted key module use worked before the TEE rework? If so,
> 
> an appropriate Fixes: Tag would then be in order.
> 
> > When checking if a CONFIG_… preprocessor variable is defined we only
> > test for the builtin (=y) case and not the module (=m) case. By using
> > the IS_ENABLE(…) macro we to test for both cases.
> 
> It looks to me like you could now provoke a link error if TEE is a module
> and built-in trusted key core tries to link against trusted_key_tee_ops.
> 
> One solution for that IS_REACHABLE(). Another is to address the root cause,
> which is the inflexible trusted keys Kconfig description:
> 
> - Trusted keys despite TEE support can still only be built when TCG_TPM is enabled
> - There is no support to have TEE or TPM enabled without using those for
>   enabled trusted keys as well
> - As you noticed, module build of the backend has issues
> 
> I addressed these three issues in a patch[1], a month ago, but have yet to
> receive feedback.

Which of the patches is the bug fix?

/Jarkko

Re: [PATCH] KEYS: trusted: Fix trusted key backends when building as module

[Jarkko Sakkinen]

On Fri, Jul 16, 2021 at 10:17:22AM +0200, Andreas Rammhold wrote:
> Before this commit the kernel could end up with no trusted key sources
> even thought both of the currently supported backends (tpm & tee) were

Nit: "TPM and TEE" instead of "tpm & tee"

> compoiled as modules. This manifested in the trusted key type not being
> registered at all.

Do you have a commit ID for the failing commit?

> When checking if a CONFIG_… preprocessor variable is defined we only
> test for the builtin (=y) case and not the module (=m) case. By using
> the IS_ENABLE(…) macro we to test for both cases.

Nit: IS_ENABLED() (without dots inside, missing 'D').

> 
> Signed-off-by: Andreas Rammhold <andreas@rammhold.de>
> ---
>  security/keys/trusted-keys/trusted_core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
> index d5c891d8d353..fd640614b168 100644
> --- a/security/keys/trusted-keys/trusted_core.c
> +++ b/security/keys/trusted-keys/trusted_core.c
> @@ -27,10 +27,10 @@ module_param_named(source, trusted_key_source, charp, 0);
>  MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
>  
>  static const struct trusted_key_source trusted_key_sources[] = {
> -#if defined(CONFIG_TCG_TPM)
> +#if IS_ENABLED(CONFIG_TCG_TPM)
>  	{ "tpm", &trusted_key_tpm_ops },
>  #endif
> -#if defined(CONFIG_TEE)
> +#if IS_ENABLED(CONFIG_TEE)
>  	{ "tee", &trusted_key_tee_ops },
>  #endif
>  };
> -- 
> 2.32.0
> 
> 

/Jarkko