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

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Message-ID: <81053742-0abf-1814-1077-b8c974623797@canonical.com>
Date:   Tue, 17 Jan 2023 22:45:32 -0800
From:   John Johansen <john.johansen@...onical.com>
To:     Tyler Hicks <code@...icks.com>, Quanfa Fu <quanfafu@...il.com>
Cc:     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 1/17/23 20:15, Tyler Hicks wrote:
> 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>
> 

Looks good, I have pulled this into my tree

Acked-by: John Johansen <john.johansen@...onical.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
>>
>>