linux-kernel - [PATCH 5.4 61/72] scsi: iscsi: Restrict sessions and handles to admin capabilities

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri,  5 Mar 2021 13:22:03 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Adam Nichols <adam@...mm-co.com>,
        Chris Leech <cleech@...hat.com>,
        Mike Christie <michael.christie@...cle.com>,
        Lee Duncan <lduncan@...e.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 5.4 61/72] scsi: iscsi: Restrict sessions and handles to admin capabilities

From: Lee Duncan <lduncan@...e.com>

commit 688e8128b7a92df982709a4137ea4588d16f24aa upstream.

Protect the iSCSI transport handle, available in sysfs, by requiring
CAP_SYS_ADMIN to read it. Also protect the netlink socket by restricting
reception of messages to ones sent with CAP_SYS_ADMIN. This disables
normal users from being able to end arbitrary iSCSI sessions.

Cc: stable@...r.kernel.org
Reported-by: Adam Nichols <adam@...mm-co.com>
Reviewed-by: Chris Leech <cleech@...hat.com>
Reviewed-by: Mike Christie <michael.christie@...cle.com>
Signed-off-by: Lee Duncan <lduncan@...e.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/scsi_transport_iscsi.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -124,6 +124,9 @@ show_transport_handle(struct device *dev
 		      char *buf)
 {
 	struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
 	return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 }
 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
@@ -3506,6 +3509,9 @@ iscsi_if_recv_msg(struct sk_buff *skb, s
 	struct iscsi_cls_conn *conn;
 	struct iscsi_endpoint *ep = NULL;
 
+	if (!netlink_capable(skb, CAP_SYS_ADMIN))
+		return -EPERM;
+
 	if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
 		*group = ISCSI_NL_GRP_UIP;
 	else