linux-kernel - Re: [PATCH 1/2] evm: building without EVM enabled fixes

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Date:	Fri, 12 Aug 2011 12:52:34 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	linux-security-module@...r.kernel.org, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org, James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: Re: [PATCH 1/2] evm: building without EVM enabled fixes

Hi Mimi,

On Thu, 11 Aug 2011 00:22:51 -0400 Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
>
> - Missing 'inline' on evm_inode_setattr() definition.
> Introduced by commit 817b54aa45db ("evm: add evm_inode_setattr to prevent
> updating an invalid security.evm").
> 
> - Missing security_old_inode_init_security() stub function definition.
> Caused by commit 9d8f13ba3f48 ("security: new security_inode_init_security
> API adds function callback").
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Mimi Zohar <zohar@...ibm.com>
> ---
>  include/linux/evm.h      |    2 +-
>  include/linux/security.h |    7 +++++++
>  2 files changed, 8 insertions(+), 1 deletions(-)
> 
> diff --git a/include/linux/evm.h b/include/linux/evm.h
> index db5556d..62deb65 100644
> --- a/include/linux/evm.h
> +++ b/include/linux/evm.h
> @@ -45,7 +45,7 @@ static inline enum integrity_status evm_verifyxattr(struct dentry *dentry,
>  }
>  #endif
>  
> -static int evm_inode_setattr(struct dentry *dentry, struct iattr *attr)
> +static inline int evm_inode_setattr(struct dentry *dentry, struct iattr *attr)
>  {
>  	return 0;
>  }
> diff --git a/include/linux/security.h b/include/linux/security.h
> index 1c528b1..f399cf1 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -2048,6 +2048,13 @@ static inline int security_inode_init_security(struct inode *inode,
>  	return -EOPNOTSUPP;
>  }
>  
> +int security_old_inode_init_security(struct inode *inode, struct inode *dir,
> +				     const struct qstr *qstr, char **name,
> +				     void **value, size_t *len)
> +{
> +	return -EOPNOTSUPP;
> +}
> +

These stub functions *must* be "staic inline" (see my build report on
linux-next) just like the one you fixed above.

Good plan:  if you introduce a function whose existance (or behaviour)
depends on a CONFIG option, then build test with and without that CONFIG
option set.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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