linux-kernel - Re: [PATCH v3 07/25] ima: Align ima_post_read_file() definition with LSM infrastructure

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Date:   Wed, 11 Oct 2023 20:07:26 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Roberto Sassu <roberto.sassu@...weicloud.com>,
        viro@...iv.linux.org.uk, brauner@...nel.org,
        chuck.lever@...cle.com, jlayton@...nel.org, neilb@...e.de,
        kolga@...app.com, Dai.Ngo@...cle.com, tom@...pey.com,
        dmitry.kasatkin@...il.com, paul@...l-moore.com, jmorris@...ei.org,
        serge@...lyn.com, dhowells@...hat.com, jarkko@...nel.org,
        stephen.smalley.work@...il.com, eparis@...isplace.org,
        casey@...aufler-ca.com
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        selinux@...r.kernel.org, Roberto Sassu <roberto.sassu@...wei.com>,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: Re: [PATCH v3 07/25] ima: Align ima_post_read_file() definition
 with LSM infrastructure

On Mon, 2023-09-04 at 15:33 +0200, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@...wei.com>
> 
> Change ima_post_read_file() definition, so that it can be registered as
> implementation of the post_read_file hook.

The only change here is making "void *buf" a "char *buf".

thanks,

Mimi

> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> Reviewed-by: Stefan Berger <stefanb@...ux.ibm.com>
> ---
>  include/linux/ima.h               | 6 +++---
>  security/integrity/ima/ima_main.c | 2 +-
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/ima.h b/include/linux/ima.h
> index 93e3c6cdf1f8..6e4d060ff378 100644
> --- a/include/linux/ima.h
> +++ b/include/linux/ima.h
> @@ -31,8 +31,8 @@ extern int ima_post_load_data(char *buf, loff_t size,
>  			      enum kernel_load_data_id id, char *description);
>  extern int ima_read_file(struct file *file, enum kernel_read_file_id id,
>  			 bool contents);
> -extern int ima_post_read_file(struct file *file, void *buf, loff_t size,
> -			      enum kernel_read_file_id id);
> +int ima_post_read_file(struct file *file, char *buf, loff_t size,
> +		       enum kernel_read_file_id id);
>  extern void ima_post_path_mknod(struct mnt_idmap *idmap,
>  				const struct path *dir, struct dentry *dentry,
>  				umode_t mode, unsigned int dev);
> @@ -112,7 +112,7 @@ static inline int ima_read_file(struct file *file, enum kernel_read_file_id id,
>  	return 0;
>  }
>  
> -static inline int ima_post_read_file(struct file *file, void *buf, loff_t size,
> +static inline int ima_post_read_file(struct file *file, char *buf, loff_t size,
>  				     enum kernel_read_file_id id)
>  {
>  	return 0;
> diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
> index e9e2a3ad25a1..f8581032e62c 100644
> --- a/security/integrity/ima/ima_main.c
> +++ b/security/integrity/ima/ima_main.c
> @@ -801,7 +801,7 @@ const int read_idmap[READING_MAX_ID] = {
>   * On success return 0.  On integrity appraisal error, assuming the file
>   * is in policy and IMA-appraisal is in enforcing mode, return -EACCES.
>   */
> -int ima_post_read_file(struct file *file, void *buf, loff_t size,
> +int ima_post_read_file(struct file *file, char *buf, loff_t size,
>  		       enum kernel_read_file_id read_id)
>  {
>  	enum ima_hooks func;