linux-kernel - Re: [PATCH v2] scsi: iscsi: kfree_sensitive() in iscsi_session

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Date:   Wed, 19 Jul 2023 10:47:45 -0700
From:   Chris Leech <cleech@...hat.com>
To:     杜敏杰 <duminjie@...o.com>
Cc:     Lee Duncan <lduncan@...e.com>,
        Mike Christie <michael.christie@...cle.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "open list:ISCSI" <open-iscsi@...glegroups.com>,
        "open list:ISCSI" <linux-scsi@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "opensource.kernel" <opensource.kernel@...o.com>
Subject: Re: [PATCH v2] scsi: iscsi: kfree_sensitive() in iscsi_session_free()

On Wed, Jul 19, 2023 at 07:45:48AM +0000, 杜敏杰 wrote:
> session might contain private part of the password, so better use
> kfree_sensitive() to free it.
> In iscsi_session_free() use kfree_sensitive() to free session->password,
> session->password_in, session->username, session->username_in.
> 
> Signed-off-by: Minjie Du <duminjie@...o.com>

This looks good, thank you for the follow up to Mike's review.

Reviewed-by: Chris Leech <cleech@...hat.com>

> ---
>  drivers/scsi/libiscsi.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
> index 0fda8905e..a307da898 100644
> --- a/drivers/scsi/libiscsi.c
> +++ b/drivers/scsi/libiscsi.c
> @@ -3132,10 +3132,10 @@ void iscsi_session_free(struct iscsi_cls_session *cls_session)
>  	struct module *owner = cls_session->transport->owner;
>  
>  	iscsi_pool_free(&session->cmdpool);
> -	kfree(session->password);
> -	kfree(session->password_in);
> -	kfree(session->username);
> -	kfree(session->username_in);
> +	kfree_sensitive(session->password);
> +	kfree_sensitive(session->password_in);
> +	kfree_sensitive(session->username);
> +	kfree_sensitive(session->username_in);
>  	kfree(session->targetname);
>  	kfree(session->targetalias);
>  	kfree(session->initiatorname);
> -- 
> 2.39.0
>