linux-kernel - RE: [PATCH] ima: Fix misuse of dereference of pointer in template_desc_init

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Date:   Mon, 14 Nov 2022 08:37:57 +0000
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     Xiujianfeng <xiujianfeng@...wei.com>,
        "zohar@...ux.ibm.com" <zohar@...ux.ibm.com>,
        "dmitry.kasatkin@...il.com" <dmitry.kasatkin@...il.com>,
        "paul@...l-moore.com" <paul@...l-moore.com>,
        "jmorris@...ei.org" <jmorris@...ei.org>,
        "serge@...lyn.com" <serge@...lyn.com>,
        "roberto.sassu@...ito.it" <roberto.sassu@...ito.it>
CC:     "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] ima: Fix misuse of dereference of pointer in
 template_desc_init_fields()

> From: Xiujianfeng
> Sent: Saturday, November 12, 2022 10:27 AM
> The input parameter @fields is type of struct ima_template_field ***, so
> when allocates array memory for @fields, the size of element should be
> sizeof(**field) instead of sizeof(*field).
> 
> Actually the original code would not cause any runtime error, but it's
> better to make it logically right.
> 
> Fixes: adf53a778a0a ("ima: new templates management mechanism")
> Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>

Reviewed-by: Roberto Sassu <roberto.sassu@...wei.com>

Thanks

Roberto

> ---
>  security/integrity/ima/ima_template.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/security/integrity/ima/ima_template.c
> b/security/integrity/ima/ima_template.c
> index 49f0626928a1..04c49f05cb74 100644
> --- a/security/integrity/ima/ima_template.c
> +++ b/security/integrity/ima/ima_template.c
> @@ -245,11 +245,11 @@ int template_desc_init_fields(const char
> *template_fmt,
>  	}
> 
>  	if (fields && num_fields) {
> -		*fields = kmalloc_array(i, sizeof(*fields), GFP_KERNEL);
> +		*fields = kmalloc_array(i, sizeof(**fields), GFP_KERNEL);
>  		if (*fields == NULL)
>  			return -ENOMEM;
> 
> -		memcpy(*fields, found_fields, i * sizeof(*fields));
> +		memcpy(*fields, found_fields, i * sizeof(**fields));
>  		*num_fields = i;
>  	}
> 
> --
> 2.17.1