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

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Message-ID: <59d94e6e-27b6-5b12-d592-8f814ee1788f@oracle.com>
Date:   Sun, 23 Jul 2023 11:44:31 -0500
From:   Mike Christie <michael.christie@...cle.com>
To:     杜敏杰 <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" <opensource.kernel@...o.com>
Subject: Re: [PATCH v2] scsi: iscsi: kfree_sensitive() in iscsi_session_free()

On 7/19/23 2:45 AM, 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>
> ---
>  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);

Reviewed-by: Mike Christie <michael.christie@...cle.com>