linux-kernel - Re: [PATCH] ima: store address of template_fmt

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Date:	Wed, 27 Nov 2013 09:55:19 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Roberto Sassu <roberto.sassu@...ito.it>
Cc:	jmorris@...ei.org, sebott@...ux.vnet.ibm.com,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ima: store address of template_fmt_copy in a pointer
 before calling strsep

On Wed, 2013-11-27 at 14:40 +0100, Roberto Sassu wrote:
> This patch stores the address of the 'template_fmt_copy' variable in a new
> variable, called 'template_fmt_ptr', so that the latter is passed as an
> argument of strsep() instead of the former. This modification is needed
> in order to correctly free the memory area referenced by
> 'template_fmt_copy' (strsep() modifies the pointer of the passed string).
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@...ito.it>
Signed-off-by: Mimi Zohar <zohar@...ibm.com>

> ---
>  security/integrity/ima/ima_template.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
> index 913e192..635695f 100644
> --- a/security/integrity/ima/ima_template.c
> +++ b/security/integrity/ima/ima_template.c
> @@ -110,7 +110,7 @@ static int template_desc_init_fields(const char *template_fmt,
>  				     struct ima_template_field ***fields,
>  				     int *num_fields)
>  {
> -	char *c, *template_fmt_copy;
> +	char *c, *template_fmt_copy, *template_fmt_ptr;
>  	int template_num_fields = template_fmt_size(template_fmt);
>  	int i, result = 0;
> 
> @@ -127,7 +127,9 @@ static int template_desc_init_fields(const char *template_fmt,
>  		result = -ENOMEM;
>  		goto out;
>  	}
> -	for (i = 0; (c = strsep(&template_fmt_copy, "|")) != NULL &&
> +
> +	template_fmt_ptr = template_fmt_copy;
> +	for (i = 0; (c = strsep(&template_fmt_ptr, "|")) != NULL &&
>  	     i < template_num_fields; i++) {
>  		struct ima_template_field *f = lookup_template_field(c);
> 


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