linux-kernel - Re: [PATCH v8 10/17] KEYS: add a reference to machine keyring

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Date:   Mon, 14 Feb 2022 12:18:20 +0000
From:   Darren Kenny <darren.kenny@...cle.com>
To:     Eric Snowberg <eric.snowberg@...cle.com>, keyrings@...r.kernel.org,
        linux-integrity@...r.kernel.org, zohar@...ux.ibm.com,
        dhowells@...hat.com, dwmw2@...radead.org,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        jarkko@...nel.org, jmorris@...ei.org, serge@...lyn.com
Cc:     eric.snowberg@...cle.com, keescook@...omium.org,
        torvalds@...ux-foundation.org, weiyongjun1@...wei.com,
        nayna@...ux.ibm.com, ebiggers@...gle.com, ardb@...nel.org,
        nramas@...ux.microsoft.com, lszubowi@...hat.com, jason@...c4.com,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-efi@...r.kernel.org, linux-security-module@...r.kernel.org,
        James.Bottomley@...senPartnership.com, pjones@...hat.com,
        konrad.wilk@...cle.com
Subject: Re: [PATCH v8 10/17] KEYS: add a reference to machine keyring

On Tuesday, 2021-11-23 at 23:41:17 -05, Eric Snowberg wrote:
> Expose the .machine keyring created in integrity code by adding
> a reference.  This makes the machine keyring accessible for keyring
> restrictions in the future.
>
> Signed-off-by: Eric Snowberg <eric.snowberg@...cle.com>

Reviewed-by: Darren Kenny <darren.kenny@...cle.com>

> ---
> v2: Initial version
> v3: set_mok_trusted_keys only available when secondary is enabled
> v4: Moved code under CONFIG_INTEGRITY_MOK_KEYRING
> v5: Rename to machine keyring
> v8: Unmodified from v5
> ---
>  certs/system_keyring.c        | 9 +++++++++
>  include/keys/system_keyring.h | 8 ++++++++
>  2 files changed, 17 insertions(+)
>
> diff --git a/certs/system_keyring.c b/certs/system_keyring.c
> index 8f1f87579819..bc7e44fc82c2 100644
> --- a/certs/system_keyring.c
> +++ b/certs/system_keyring.c
> @@ -22,6 +22,9 @@ static struct key *builtin_trusted_keys;
>  #ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
>  static struct key *secondary_trusted_keys;
>  #endif
> +#ifdef CONFIG_INTEGRITY_MACHINE_KEYRING
> +static struct key *machine_trusted_keys;
> +#endif
>  #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
>  static struct key *platform_trusted_keys;
>  #endif
> @@ -91,6 +94,12 @@ static __init struct key_restriction *get_secondary_restriction(void)
>  	return restriction;
>  }
>  #endif
> +#ifdef CONFIG_INTEGRITY_MACHINE_KEYRING
> +void __init set_machine_trusted_keys(struct key *keyring)
> +{
> +	machine_trusted_keys = keyring;
> +}
> +#endif
>  
>  /*
>   * Create the trusted keyrings
> diff --git a/include/keys/system_keyring.h b/include/keys/system_keyring.h
> index 6acd3cf13a18..98c9b10cdc17 100644
> --- a/include/keys/system_keyring.h
> +++ b/include/keys/system_keyring.h
> @@ -38,6 +38,14 @@ extern int restrict_link_by_builtin_and_secondary_trusted(
>  #define restrict_link_by_builtin_and_secondary_trusted restrict_link_by_builtin_trusted
>  #endif
>  
> +#ifdef CONFIG_INTEGRITY_MACHINE_KEYRING
> +extern void __init set_machine_trusted_keys(struct key *keyring);
> +#else
> +static inline void __init set_machine_trusted_keys(struct key *keyring)
> +{
> +}
> +#endif
> +
>  extern struct pkcs7_message *pkcs7;
>  #ifdef CONFIG_SYSTEM_BLACKLIST_KEYRING
>  extern int mark_hash_blacklisted(const char *hash);
> -- 
> 2.18.4