linux-kernel - Re: [PATCH 2/3] IMA: Handle dentry

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Date:	Mon, 11 May 2009 19:18:12 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Eric Paris <eparis@...hat.com>
Cc:	linux-kernel@...r.kernel.org, jmorris@...ei.org
Subject: Re: [PATCH 2/3] IMA: Handle dentry_open failures

On Mon, 2009-05-11 at 13:59 -0400, Eric Paris wrote:
> Currently IMA does not handle failures from dentry_open().  This means that we
> leave a pointer set to ERR_PTR(errno) and then try to use it just a few lines
> later in fput().  Oops.
> 
> Signed-off-by: Eric Paris <eparis@...hat.com>
Acked-by: Mimi Zohar <zohar@...ibm.com>

> ---
> 
>  security/integrity/ima/ima_main.c |   10 ++++++----
>  1 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
> index cdae13c..1987424 100644
> --- a/security/integrity/ima/ima_main.c
> +++ b/security/integrity/ima/ima_main.c
> @@ -116,10 +116,6 @@ static int get_path_measurement(struct ima_iint_cache *iint, struct file *file,
>  {
>  	int rc = 0;
> 
> -	if (IS_ERR(file)) {
> -		pr_info("%s dentry_open failed\n", filename);
> -		return rc;
> -	}
>  	iint->opencount++;
>  	iint->readcount++;
> 
> @@ -185,6 +181,12 @@ int ima_path_check(struct path *path, int mask)
>  		struct vfsmount *mnt = mntget(path->mnt);
> 
>  		file = dentry_open(dentry, mnt, O_RDONLY, current_cred());
> +		if (IS_ERR(file)) {
> +			pr_info("%s dentry_open failed\n", dentry->d_name.name);
> +			rc = PTR_ERR(file);
> +			file = NULL;
> +			goto out;
> +		}
>  		rc = get_path_measurement(iint, file, dentry->d_name.name);
>  	}
>  out:
> 

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