File 0009-allocate-scsi-targetreq-rbuf-dynamically.patch of Package xen.openSUSE_13.1_Update

Subject: scsi: Allocate SCSITargetReq r->buf dynamically [CVE-2013-4344]
From: Asias He asias@redhat.com Wed Oct 9 15:41:03 2013 +0800
Date: Wed Oct 9 17:24:18 2013 +0200:
Git: 846424350b292f16b732b573273a5c1f195cd7a3

r->buf is hardcoded to 2056 which is (256 + 1) * 8, allowing 256 luns at
most. If more than 256 luns are specified by user, we have buffer
overflow in scsi_target_emulate_report_luns.

To fix, we allocate the buffer dynamically.

Signed-off-by: Asias He <asias@redhat.com>
Tested-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Index: xen-4.3.2-testing/tools/qemu-xen-dir-remote/hw/scsi-bus.c
===================================================================
--- xen-4.3.2-testing.orig/tools/qemu-xen-dir-remote/hw/scsi-bus.c
+++ xen-4.3.2-testing/tools/qemu-xen-dir-remote/hw/scsi-bus.c
@@ -11,6 +11,8 @@ static char *scsibus_get_dev_path(Device
 static char *scsibus_get_fw_dev_path(DeviceState *dev);
 static int scsi_req_parse(SCSICommand *cmd, SCSIDevice *dev, uint8_t *buf);
 static void scsi_req_dequeue(SCSIRequest *req);
+static uint8_t *scsi_target_alloc_buf(SCSIRequest *req, size_t len);
+static void scsi_target_free_buf(SCSIRequest *req);
 
 static Property scsi_props[] = {
     DEFINE_PROP_UINT32("channel", SCSIDevice, channel, 0),
@@ -304,7 +306,8 @@ typedef struct SCSITargetReq SCSITargetR
 struct SCSITargetReq {
     SCSIRequest req;
     int len;
-    uint8_t buf[2056];
+    uint8_t *buf;
+    int buf_len;
 };
 
 static void store_lun(uint8_t *outbuf, int lun)
@@ -348,14 +351,12 @@ static bool scsi_target_emulate_report_l
     if (!found_lun0) {
         n += 8;
     }
-    len = MIN(n + 8, r->req.cmd.xfer & ~7);
-    if (len > sizeof(r->buf)) {
-        /* TODO: > 256 LUNs? */
-        return false;
-    }
 
+    scsi_target_alloc_buf(&r->req, n + 8);
+
+    len = MIN(n + 8, r->req.cmd.xfer & ~7);
     memset(r->buf, 0, len);
-    stl_be_p(&r->buf, n);
+    stl_be_p(&r->buf[0], n);
     i = found_lun0 ? 8 : 16;
     QTAILQ_FOREACH(kid, &r->req.bus->qbus.children, sibling) {
         DeviceState *qdev = kid->child;
@@ -374,6 +375,9 @@ static bool scsi_target_emulate_report_l
 static bool scsi_target_emulate_inquiry(SCSITargetReq *r)
 {
     assert(r->req.dev->lun != r->req.lun);
+
+    scsi_target_alloc_buf(&r->req, SCSI_INQUIRY_LEN);
+
     if (r->req.cmd.buf[1] & 0x2) {
         /* Command support data - optional, not implemented */
         return false;
@@ -398,7 +402,7 @@ static bool scsi_target_emulate_inquiry(
             return false;
         }
         /* done with EVPD */
-        assert(r->len < sizeof(r->buf));
+        assert(r->len < r->buf_len);
         r->len = MIN(r->req.cmd.xfer, r->len);
         return true;
     }
@@ -409,7 +413,7 @@ static bool scsi_target_emulate_inquiry(
     }
 
     /* PAGE CODE == 0 */
-    r->len = MIN(r->req.cmd.xfer, 36);
+    r->len = MIN(r->req.cmd.xfer, SCSI_INQUIRY_LEN);
     memset(r->buf, 0, r->len);
     if (r->req.lun != 0) {
         r->buf[0] = TYPE_NO_LUN;
@@ -442,8 +446,9 @@ static int32_t scsi_target_send_command(
         }
         break;
     case REQUEST_SENSE:
+        scsi_target_alloc_buf(&r->req, SCSI_SENSE_LEN);
         r->len = scsi_device_get_sense(r->req.dev, r->buf,
-                                       MIN(req->cmd.xfer, sizeof r->buf),
+                                       MIN(req->cmd.xfer, r->buf_len),
                                        (req->cmd.buf[1] & 1) == 0);
         if (r->req.dev->sense_is_ua) {
             scsi_device_unit_attention_reported(req->dev);
@@ -488,11 +493,29 @@ static uint8_t *scsi_target_get_buf(SCSI
     return r->buf;
 }
 
+static uint8_t *scsi_target_alloc_buf(SCSIRequest *req, size_t len)
+{
+    SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
+
+    r->buf = g_malloc(len);
+    r->buf_len = len;
+
+    return r->buf;
+}
+
+static void scsi_target_free_buf(SCSIRequest *req)
+{
+    SCSITargetReq *r = DO_UPCAST(SCSITargetReq, req, req);
+
+    g_free(r->buf);
+}
+
 static const struct SCSIReqOps reqops_target_command = {
     .size         = sizeof(SCSITargetReq),
     .send_command = scsi_target_send_command,
     .read_data    = scsi_target_read_data,
     .get_buf      = scsi_target_get_buf,
+    .free_req     = scsi_target_free_buf,
 };
 
 
@@ -1348,7 +1371,7 @@ int scsi_build_sense(uint8_t *in_buf, in
         buf[7] = 10;
         buf[12] = sense.asc;
         buf[13] = sense.ascq;
-        return MIN(len, 18);
+        return MIN(len, SCSI_SENSE_LEN);
     } else {
         /* Return descriptor format sense buffer */
         buf[0] = 0x72;
Index: xen-4.3.2-testing/tools/qemu-xen-dir-remote/hw/scsi.h
===================================================================
--- xen-4.3.2-testing.orig/tools/qemu-xen-dir-remote/hw/scsi.h
+++ xen-4.3.2-testing/tools/qemu-xen-dir-remote/hw/scsi.h
@@ -9,6 +9,8 @@
 #define MAX_SCSI_DEVS	255
 
 #define SCSI_CMD_BUF_SIZE     16
+#define SCSI_SENSE_LEN      18
+#define SCSI_INQUIRY_LEN    36
 
 typedef struct SCSIBus SCSIBus;
 typedef struct SCSIBusInfo SCSIBusInfo;