linux-kernel - Re: [PATCH v5 07/12] evm: Allow xattr/attr operations for portable signatures

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Date:   Sun, 02 May 2021 20:12:49 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Roberto Sassu <roberto.sassu@...wei.com>, mjg59@...gle.com
Cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 07/12] evm: Allow xattr/attr operations for portable
 signatures

Hi Roberto,

> diff --git a/include/linux/integrity.h b/include/linux/integrity.h
> index 2271939c5c31..2ea0f2f65ab6 100644
> --- a/include/linux/integrity.h
> +++ b/include/linux/integrity.h
> 
> @@ -238,9 +241,12 @@ static enum integrity_status evm_verify_hmac(struct dentry *dentry,
>  		break;
>  	}
>  
> -	if (rc)
> -		evm_status = (rc == -ENODATA) ?
> -				INTEGRITY_NOXATTRS : INTEGRITY_FAIL;
> +	if (rc) {
> +		evm_status = INTEGRITY_NOXATTRS;
> +		if (rc != -ENODATA)
> +			evm_status = evm_immutable ?
> +				     INTEGRITY_FAIL_IMMUTABLE : INTEGRITY_FAIL;

The original code made an exception for the -ENODATA case.   Using a
ternary operator made sense in that case.   Inverting the test makes
the code less readable.  Please use the standard "if" statement
instead.

thanks,

Mimi