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scsi: iscsi: Restrict sessions and handles to admin capabilities

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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@vger.kernel.org
Reported-by: Adam Nichols <adam@grimm-co.com>
Reviewed-by: Chris Leech <cleech@redhat.com>
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lee Duncan 2021-02-23 13:06:24 -08:00 committed by Greg Kroah-Hartman
parent fdaec40526
commit ca3afdd037
1 changed files with 6 additions and 0 deletions
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6
drivers/scsi/scsi_transport_iscsi.c
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@ -124,6 +124,9 @@ show_transport_handle(struct device *dev, struct device_attribute *attr,
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, struct nlmsghdr *nlh, uint32_t *group)
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