[CVE-2014-3615 PATCH v2 1/3] vbe: make bochs dispi interface return the correct memory size with qxl

[Gerd Hoffmann <kraxel@xxxxxxxxxx>]

VgaState->vram_size is the size of the pci bar.  In case of qxl not the
whole pci bar can be used as vga framebuffer.  Add a new variable
vbe_size to handle that case.  By default (if unset) it equals
vram_size, but qxl can set vbe_size to something else.

This makes sure VBE_DISPI_INDEX_VIDEO_MEMORY_64K returns correct results
and sanity checks are done with the correct size too.

Cc: qemu-stable@xxxxxxxxxx
Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Reviewed-by: Laszlo Ersek <lersek@xxxxxxxxxx>
---
 hw/display/qxl.c     | 1 +
 hw/display/vga.c     | 7 +++++--
 hw/display/vga_int.h | 1 +
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/hw/display/qxl.c b/hw/display/qxl.c
index d43aa49..652af99 100644
--- a/hw/display/qxl.c
+++ b/hw/display/qxl.c
@@ -2063,6 +2063,7 @@ static int qxl_init_primary(PCIDevice *dev)
 
     qxl->id = 0;
     qxl_init_ramsize(qxl);
+    vga->vbe_size = qxl->vgamem_size;
     vga->vram_size_mb = qxl->vga.vram_size >> 20;
     vga_common_init(vga, OBJECT(dev), true);
     vga_init(vga, OBJECT(dev),
diff --git a/hw/display/vga.c b/hw/display/vga.c
index 65dab8d..99251d7 100644
--- a/hw/display/vga.c
+++ b/hw/display/vga.c
@@ -610,7 +610,7 @@ uint32_t vbe_ioport_read_data(void *opaque, uint32_t addr)
             val = s->vbe_regs[s->vbe_index];
         }
     } else if (s->vbe_index == VBE_DISPI_INDEX_VIDEO_MEMORY_64K) {
-        val = s->vram_size / (64 * 1024);
+        val = s->vbe_size / (64 * 1024);
     } else {
         val = 0;
     }
@@ -749,7 +749,7 @@ void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val)
                     line_offset = w >> 1;
                 else
                     line_offset = w * ((s->vbe_regs[VBE_DISPI_INDEX_BPP] + 7) >> 3);
-                h = s->vram_size / line_offset;
+                h = s->vbe_size / line_offset;
                 /* XXX: support weird bochs semantics ? */
                 if (h < s->vbe_regs[VBE_DISPI_INDEX_YRES])
                     return;
@@ -2285,6 +2285,9 @@ void vga_common_init(VGACommonState *s, Object *obj, bool global_vmstate)
         s->vram_size <<= 1;
     }
     s->vram_size_mb = s->vram_size >> 20;
+    if (!s->vbe_size) {
+        s->vbe_size = s->vram_size;
+    }
 
     s->is_vbe_vmstate = 1;
     memory_region_init_ram(&s->vram, obj, "vga.vram", s->vram_size);
diff --git a/hw/display/vga_int.h b/hw/display/vga_int.h
index 641f8f4..bbc0cb2 100644
--- a/hw/display/vga_int.h
+++ b/hw/display/vga_int.h
@@ -93,6 +93,7 @@ typedef struct VGACommonState {
     MemoryRegion vram_vbe;
     uint32_t vram_size;
     uint32_t vram_size_mb; /* property */
+    uint32_t vbe_size;
     uint32_t latch;
     bool has_chain4_alias;
     MemoryRegion chain4_alias;
-- 
1.8.3.1

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