linux-kernel - Re: [PATCH v5 05/21] ima: move ima_file

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Message-ID: <20110519220649.GA4332@mail.hallyn.com>
Date:	Thu, 19 May 2011 17:06:49 -0500
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <greg@...ah.com>,
	Dmitry Kasatkin <dmitry.kasatkin@...ia.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: Re: [PATCH v5 05/21] ima: move ima_file_free before releasing the
 file

Quoting Mimi Zohar (zohar@...ux.vnet.ibm.com):
> Integrity appraisal measures files on file_free and stores the file
> measurement as an xattr.  Measure the file before releasing it.

Can you put a bit more in the commit msg about why?  What's magic
about the fs-specific release function?

> Signed-off-by: Mimi Zohar <zohar@...ibm.com>
> Acked-by: Serge Hallyn <serge.hallyn@...ntu.com>
> ---
>  fs/file_table.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/file_table.c b/fs/file_table.c
> index 01e4c1e..33f54a1 100644
> --- a/fs/file_table.c
> +++ b/fs/file_table.c
> @@ -243,10 +243,10 @@ static void __fput(struct file *file)
>  		if (file->f_op && file->f_op->fasync)
>  			file->f_op->fasync(-1, file, 0);
>  	}
> +	ima_file_free(file);
>  	if (file->f_op && file->f_op->release)
>  		file->f_op->release(inode, file);
>  	security_file_free(file);
> -	ima_file_free(file);
>  	if (unlikely(S_ISCHR(inode->i_mode) && inode->i_cdev != NULL &&
>  		     !(file->f_mode & FMODE_PATH))) {
>  		cdev_put(inode->i_cdev);
> -- 
> 1.7.3.4
> 
> --
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