linux-kernel - Re: [PATCH v1] scsi: iscsi: use kfree_sensitive() in iscsi_session

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Date:   Mon, 17 Jul 2023 13:25:38 -0500
From:   Mike Christie <michael.christie@...cle.com>
To:     Minjie Du <duminjie@...o.com>, Lee Duncan <lduncan@...e.com>,
        Chris Leech <cleech@...hat.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>
Cc:     opensource.kernel@...o.com
Subject: Re: [PATCH v1] scsi: iscsi: use kfree_sensitive() in
 iscsi_session_free()

On 7/17/23 4:26 AM, Minjie Du 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.
> 
> Signed-off-by: Minjie Du <duminjie@...o.com>
> ---
>  drivers/scsi/libiscsi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
> index 0fda8905e..2f273229c 100644
> --- a/drivers/scsi/libiscsi.c
> +++ b/drivers/scsi/libiscsi.c
> @@ -3132,7 +3132,7 @@ 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_sensitive(session->password);
>  	kfree(session->password_in);

You then also want kfree_sensitive for password_in.

I would also use it for the usernames then too.

>  	kfree(session->username);
>  	kfree(session->username_in);