linux-kernel - Re: [PATCH] integrity, KEYS: Fix build break with set_platform_trusted

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Date:   Mon, 04 Feb 2019 17:20:08 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Kairui Song <kasong@...hat.com>, linux-kernel@...r.kernel.org
Cc:     dhowells@...hat.com, dwmw2@...radead.org,
        jwboyer@...oraproject.org, keyrings@...r.kernel.org,
        jmorris@...ei.org, serge@...lyn.com, bauerman@...ux.ibm.com,
        ebiggers@...gle.com, nayna@...ux.ibm.com, dyoung@...hat.com,
        linux-integrity@...r.kernel.org, kexec@...ts.infradead.org
Subject: Re: [PATCH] integrity, KEYS: Fix build break with
 set_platform_trusted_keys

On Sun, 2019-02-03 at 23:59 +0800, Kairui Song wrote:
> Commit 15ebb2eb0705 ("integrity, KEYS: add a reference to platform
> keyring") introduced a function set_platform_trusted_keys
> and calls the function in __integrity_init_keyring.
> 
> It only checks if CONFIG_INTEGRITY_PLATFORM_KEYRING is enabled when
> enabling this function, but actually this function also depends on
> CONFIG_SYSTEM_TRUSTED_KEYRING.
> 
> So when built with CONFIG_INTEGRITY_PLATFORM_KEYRING &&
> !CONFIG_SYSTEM_TRUSTED_KEYRING. we will get following error:
> 
> digsig.c:92: undefined reference to `set_platform_trusted_keys'
> 
> And it also mistakenly wrapped the function code in the ifdef block of
> CONFIG_SYSTEM_DATA_VERIFICATION.
> 
> This commit fixes the issue by adding the missing check of
> CONFIG_SYSTEM_TRUSTED_KEYRING and move the function code out of
> CONFIG_SYSTEM_DATA_VERIFICATION's ifdef block.
> 
> Fixes: 15ebb2eb0705 ("integrity, KEYS: add a reference to platform keyring")
> Signed-off-by: Kairui Song <kasong@...hat.com>

Thank you.  As the original patch hasn't yet been upstreamed , I plan
on squashing them.

Mimi


> ---
>  certs/system_keyring.c        | 4 ++--
>  include/keys/system_keyring.h | 9 +++------
>  2 files changed, 5 insertions(+), 8 deletions(-)
> 
> diff --git a/certs/system_keyring.c b/certs/system_keyring.c
> index 19bd0504bbcb..c05c29ae4d5d 100644
> --- a/certs/system_keyring.c
> +++ b/certs/system_keyring.c
> @@ -279,11 +279,11 @@ int verify_pkcs7_signature(const void *data, size_t len,
>  }
>  EXPORT_SYMBOL_GPL(verify_pkcs7_signature);
>  
> +#endif /* CONFIG_SYSTEM_DATA_VERIFICATION */
> +
>  #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
>  void __init set_platform_trusted_keys(struct key *keyring)
>  {
>  	platform_trusted_keys = keyring;
>  }
>  #endif
> -
> -#endif /* CONFIG_SYSTEM_DATA_VERIFICATION */
> diff --git a/include/keys/system_keyring.h b/include/keys/system_keyring.h
> index c7f899ee974e..42a93eda331c 100644
> --- a/include/keys/system_keyring.h
> +++ b/include/keys/system_keyring.h
> @@ -61,16 +61,13 @@ static inline struct key *get_ima_blacklist_keyring(void)
>  }
>  #endif /* CONFIG_IMA_BLACKLIST_KEYRING */
>  
> -#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
> -
> +#if defined(CONFIG_INTEGRITY_PLATFORM_KEYRING) && \
> +	defined(CONFIG_SYSTEM_TRUSTED_KEYRING)
>  extern void __init set_platform_trusted_keys(struct key *keyring);
> -
>  #else
> -
>  static inline void set_platform_trusted_keys(struct key *keyring)
>  {
>  }
> -
> -#endif /* CONFIG_INTEGRITY_PLATFORM_KEYRING */
> +#endif
>  
>  #endif /* _KEYS_SYSTEM_KEYRING_H */