linux-kernel - Re: [apparmor] [PATCH] apparmor: make aa_set_current

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Message-ID: <Y8dyfZIAhFfIvVBn@sequoia>
Date:   Tue, 17 Jan 2023 22:15:57 -0600
From:   Tyler Hicks <code@...icks.com>
To:     Quanfa Fu <quanfafu@...il.com>
Cc:     john.johansen@...onical.com, paul@...l-moore.com,
        jmorris@...ei.org, serge@...lyn.com,
        linux-security-module@...r.kernel.org, apparmor@...ts.ubuntu.com,
        linux-kernel@...r.kernel.org
Subject: Re: [apparmor] [PATCH] apparmor: make aa_set_current_onexec return
 void

On 2023-01-15 00:49:52, Quanfa Fu wrote:
> Change the return type to void since it always return 0, and no need
> to do the checking in aa_set_current_onexec.
> 
> Signed-off-by: Quanfa Fu <quanfafu@...il.com>

This looks like a safe change to me. There's nothing to error check
within aa_set_current_onexec() so returning void is fine.

  Reviewed-by: "Tyler Hicks (Microsoft)" <code@...icks.com>

Tyler

> ---
>  security/apparmor/domain.c       | 2 +-
>  security/apparmor/include/task.h | 2 +-
>  security/apparmor/task.c         | 5 +----
>  3 files changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c
> index 6dd3cc5309bf..bbc9c8a87b8e 100644
> --- a/security/apparmor/domain.c
> +++ b/security/apparmor/domain.c
> @@ -1446,7 +1446,7 @@ int aa_change_profile(const char *fqname, int flags)
>  		}
>  
>  		/* full transition will be built in exec path */
> -		error = aa_set_current_onexec(target, stack);
> +		aa_set_current_onexec(target, stack);
>  	}
>  
>  audit:
> diff --git a/security/apparmor/include/task.h b/security/apparmor/include/task.h
> index 13437d62c70f..01717fe432c3 100644
> --- a/security/apparmor/include/task.h
> +++ b/security/apparmor/include/task.h
> @@ -30,7 +30,7 @@ struct aa_task_ctx {
>  };
>  
>  int aa_replace_current_label(struct aa_label *label);
> -int aa_set_current_onexec(struct aa_label *label, bool stack);
> +void aa_set_current_onexec(struct aa_label *label, bool stack);
>  int aa_set_current_hat(struct aa_label *label, u64 token);
>  int aa_restore_previous_label(u64 cookie);
>  struct aa_label *aa_get_task_label(struct task_struct *task);
> diff --git a/security/apparmor/task.c b/security/apparmor/task.c
> index 84d16a29bfcb..5671a716fcd2 100644
> --- a/security/apparmor/task.c
> +++ b/security/apparmor/task.c
> @@ -93,9 +93,8 @@ int aa_replace_current_label(struct aa_label *label)
>   * aa_set_current_onexec - set the tasks change_profile to happen onexec
>   * @label: system label to set at exec  (MAYBE NULL to clear value)
>   * @stack: whether stacking should be done
> - * Returns: 0 or error on failure
>   */
> -int aa_set_current_onexec(struct aa_label *label, bool stack)
> +void aa_set_current_onexec(struct aa_label *label, bool stack)
>  {
>  	struct aa_task_ctx *ctx = task_ctx(current);
>  
> @@ -103,8 +102,6 @@ int aa_set_current_onexec(struct aa_label *label, bool stack)
>  	aa_put_label(ctx->onexec);
>  	ctx->onexec = label;
>  	ctx->token = stack;
> -
> -	return 0;
>  }
>  
>  /**
> -- 
> 2.31.1
> 
>