linux-kernel - Re: [PATCH] apparmor: Use pointer to struct aa_label for lbs

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Date:   Thu, 20 Oct 2022 06:01:51 -0700
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     Xiu Jianfeng <xiujianfeng@...wei.com>, john.johansen@...onical.com,
        paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com,
        keescook@...omium.org
Cc:     apparmor@...ts.ubuntu.com, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, casey@...aufler-ca.com
Subject: Re: [PATCH] apparmor: Use pointer to struct aa_label for lbs_cred

On 10/19/2022 7:36 PM, Xiu Jianfeng wrote:
> According to the implementations of cred_label and set_cred_label, we
> should use pointer to struct aa_label for lbs_cred instead of struct
> aa_task_ctx, this patch fix it.
>
> Fixes: bbd3662a8348 ("Infrastructure management of the cred security blob")
> Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
> ---
>  security/apparmor/lsm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
> index f56070270c69..fd2f57972a17 100644
> --- a/security/apparmor/lsm.c
> +++ b/security/apparmor/lsm.c
> @@ -1197,7 +1197,7 @@ static int apparmor_inet_conn_request(const struct sock *sk, struct sk_buff *skb
>   * The cred blob is a pointer to, not an instance of, an aa_task_ctx.

If your premise is true you'll want to fix this comment as well as the code.

>   */
>  struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
> -	.lbs_cred = sizeof(struct aa_task_ctx *),
> +	.lbs_cred = sizeof(struct aa_label *),
>  	.lbs_file = sizeof(struct aa_file_ctx),
>  	.lbs_task = sizeof(struct aa_task_ctx),
>  };