File CVE-2014-3689-qemuu-vmware-vga-vmsvga_copy_rect.patch of Package xen.6121

References: bsc#962611 CVE-2014-3689

Subject: vmware-vga: use vmsvga_verify_rect in vmsvga_copy_rect
From: Gerd Hoffmann kraxel@redhat.com Mon Oct 6 11:58:51 2014 +0200
Date: Wed Oct 29 12:01:26 2014 +0100:
Git: 61b41b4c20eba08d2185297767e69153d7f3e09d

Add verification to vmsvga_copy_rect, re-enable HW_RECT_ACCEL.

Cc: qemu-stable@nongnu.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Don Koch <dkoch@verizon.com>

Index: xen-4.4.3-testing/tools/qemu-xen-dir-remote/hw/display/vmware_vga.c
===================================================================
--- xen-4.4.3-testing.orig/tools/qemu-xen-dir-remote/hw/display/vmware_vga.c
+++ xen-4.4.3-testing/tools/qemu-xen-dir-remote/hw/display/vmware_vga.c
@@ -28,8 +28,8 @@
 
 #undef VERBOSE
 #pragma GCC diagnostic ignored "-Wunused-but-set-variable"
-#if 0
 #define HW_RECT_ACCEL
+#if 0
 #define HW_FILL_ACCEL
 #endif
 #define HW_MOUSE_ACCEL
@@ -405,7 +405,7 @@ static inline void vmsvga_update_rect_fl
 }
 
 #ifdef HW_RECT_ACCEL
-static inline void vmsvga_copy_rect(struct vmsvga_state_s *s,
+static inline int vmsvga_copy_rect(struct vmsvga_state_s *s,
                 int x0, int y0, int x1, int y1, int w, int h)
 {
     DisplaySurface *surface = qemu_console_surface(s->vga.con);
@@ -416,6 +416,13 @@ static inline void vmsvga_copy_rect(stru
     int line = h;
     uint8_t *ptr[2];
 
+    if (!vmsvga_verify_rect(surface, "vmsvga_copy_rect/src", x0, y0, w, h)) {
+        return -1;
+    }
+    if (!vmsvga_verify_rect(surface, "vmsvga_copy_rect/dst", x1, y1, w, h)) {
+        return -1;
+    }
+
     if (y1 > y0) {
         ptr[0] = vram + bypp * x0 + bypl * (y0 + h - 1);
         ptr[1] = vram + bypp * x1 + bypl * (y1 + h - 1);
@@ -431,6 +438,7 @@ static inline void vmsvga_copy_rect(stru
     }
 
     vmsvga_update_rect_delayed(s, x1, y1, w, h);
+    return 0;
 }
 #endif
 
@@ -624,12 +632,12 @@ static void vmsvga_fifo_run(struct vmsvg
             width = vmsvga_fifo_read(s);
             height = vmsvga_fifo_read(s);
 #ifdef HW_RECT_ACCEL
-            vmsvga_copy_rect(s, x, y, dx, dy, width, height);
-            break;
-#else
+            if (vmsvga_copy_rect(s, x, y, dx, dy, width, height) == 0) {
+                break;
+            }
+#endif
             args = 0;
             goto badcmd;
-#endif
 
         case SVGA_CMD_DEFINE_CURSOR:
             len -= 8;