linux-kernel - Re: [RFC][PATCH 3/7] smack: assign the label set in file->f

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Date:	Wed, 27 Apr 2011 16:26:43 -0700
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Roberto Sassu <roberto.sassu@...ito.it>
CC:	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	dhowells@...hat.com, jmorris@...ei.org, zohar@...ux.vnet.ibm.com,
	safford@...son.ibm.com, tyhicks@...ux.vnet.ibm.com,
	kirkland@...onical.com, ecryptfs-devel@...ts.launchpad.net,
	eparis@...hat.com, sds@...ho.nsa.gov, selinux@...ho.nsa.gov,
	viro@...iv.linux.org.uk
Subject: Re: [RFC][PATCH 3/7] smack: assign the label set in file->f_cred
 to new file descriptors

On 4/27/2011 5:34 AM, Roberto Sassu wrote:
> The SMACK label of new file descriptors is obtained from the credentials
> set in the 'f_cred' field of the same structure.
>
> Signed-off-by: Roberto Sassu <roberto.sassu@...ito.it>
> ---
>  security/smack/smack_lsm.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index c6f8fca..e3c9e54 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -1011,7 +1011,7 @@ static int smack_file_permission(struct file *file, int mask)
>   */
>  static int smack_file_alloc_security(struct file *file)
>  {
> -	file->f_security = smk_of_current();
> +	file->f_security = smk_of_task(file->f_cred->security);

Now hang on. This just looks wrong. You're setting the value of one
field of the file structure to another value in the same file structure.
I don't see that this is what I want.

>  	return 0;
>  }
>  

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