From df5995a56f706268a23451204eadb1823a1f93b5 Mon Sep 17 00:00:00 2001

From: Gerd Hoffmann <kraxel@redhat.com>

Date: Mon, 15 Sep 2014 13:08:21 +0200

Subject: [PATCH 4/6] vbe: rework sanity checks

Message-id: <1410786503-19794-3-git-send-email-kraxel@redhat.com>

Patchwork-id: 61137

O-Subject: [RHEL-7.1 qemu-kvm PATCH 2/4] vbe: rework sanity checks

Bugzilla: 1139117

RH-Acked-by: Markus Armbruster <armbru@redhat.com>

RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>

RH-Acked-by: Laszlo Ersek <lersek@redhat.com>

Plug a bunch of holes in the bochs dispi interface parameter checking.

Add a function doing verification on all registers.  Call that

unconditionally on every register write.  That way we should catch

everything, even changing one register affecting the valid range of

another register.

Some of the holes have been added by commit

e9c6149f6ae6873f14a12eea554925b6aa4c4dec.  Before that commit the

maximum possible framebuffer (VBE_DISPI_MAX_XRES * VBE_DISPI_MAX_YRES *

32 bpp) has been smaller than the qemu vga memory (8MB) and the checking

for VBE_DISPI_MAX_XRES + VBE_DISPI_MAX_YRES + VBE_DISPI_MAX_BPP was ok.

Some of the holes have been there forever, such as

VBE_DISPI_INDEX_X_OFFSET and VBE_DISPI_INDEX_Y_OFFSET register writes

lacking any verification.

Security impact:

(1) Guest can make the ui (gtk/vnc/...) use memory rages outside the vga

frame buffer as source  ->  host memory leak.  Memory isn't leaked to

the guest but to the vnc client though.

(2) Qemu will segfault in case the memory range happens to include

unmapped areas  ->  Guest can DoS itself.

The guest can not modify host memory, so I don't think this can be used

by the guest to escape.

CVE-2014-3615

Cc: qemu-stable@nongnu.org

Cc: secalert@redhat.com

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

Reviewed-by: Laszlo Ersek <lersek@redhat.com>

(cherry picked from commit c1b886c45dc70f247300f549dce9833f3fa2def5)

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

---

 hw/display/vga.c |  154 +++++++++++++++++++++++++++++++++---------------------

 1 files changed, 95 insertions(+), 59 deletions(-)

diff --git a/hw/display/vga.c b/hw/display/vga.c

index d703d90..de5d63d 100644

--- a/hw/display/vga.c

+++ b/hw/display/vga.c

@@ -579,6 +579,93 @@ void vga_ioport_write(void *opaque, uint32_t addr, uint32_t val)

     }

 }

+/*

+ * Sanity check vbe register writes.

+ *

+ * As we don't have a way to signal errors to the guest in the bochs

+ * dispi interface we'll go adjust the registers to the closest valid

+ * value.

+ */

+static void vbe_fixup_regs(VGACommonState *s)

+{

+    uint16_t *r = s->vbe_regs;

+    uint32_t bits, linelength, maxy, offset;

+

+    if (!(r[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) {

+        /* vbe is turned off -- nothing to do */

+        return;

+    }

+

+    /* check depth */

+    switch (r[VBE_DISPI_INDEX_BPP]) {

+    case 4:

+    case 8:

+    case 16:

+    case 24:

+    case 32:

+        bits = r[VBE_DISPI_INDEX_BPP];

+        break;

+    case 15:

+        bits = 16;

+        break;

+    default:

+        bits = r[VBE_DISPI_INDEX_BPP] = 8;

+        break;

+    }

+

+    /* check width */

+    r[VBE_DISPI_INDEX_XRES] &= ~7u;

+    if (r[VBE_DISPI_INDEX_XRES] == 0) {

+        r[VBE_DISPI_INDEX_XRES] = 8;

+    }

+    if (r[VBE_DISPI_INDEX_XRES] > VBE_DISPI_MAX_XRES) {

+        r[VBE_DISPI_INDEX_XRES] = VBE_DISPI_MAX_XRES;

+    }

+    r[VBE_DISPI_INDEX_VIRT_WIDTH] &= ~7u;

+    if (r[VBE_DISPI_INDEX_VIRT_WIDTH] > VBE_DISPI_MAX_XRES) {

+        r[VBE_DISPI_INDEX_VIRT_WIDTH] = VBE_DISPI_MAX_XRES;

+    }

+    if (r[VBE_DISPI_INDEX_VIRT_WIDTH] < r[VBE_DISPI_INDEX_XRES]) {

+        r[VBE_DISPI_INDEX_VIRT_WIDTH] = r[VBE_DISPI_INDEX_XRES];

+    }

+

+    /* check height */

+    linelength = r[VBE_DISPI_INDEX_VIRT_WIDTH] * bits / 8;

+    maxy = s->vbe_size / linelength;

+    if (r[VBE_DISPI_INDEX_YRES] == 0) {

+        r[VBE_DISPI_INDEX_YRES] = 1;

+    }

+    if (r[VBE_DISPI_INDEX_YRES] > VBE_DISPI_MAX_YRES) {

+        r[VBE_DISPI_INDEX_YRES] = VBE_DISPI_MAX_YRES;

+    }

+    if (r[VBE_DISPI_INDEX_YRES] > maxy) {

+        r[VBE_DISPI_INDEX_YRES] = maxy;

+    }

+

+    /* check offset */

+    if (r[VBE_DISPI_INDEX_X_OFFSET] > VBE_DISPI_MAX_XRES) {

+        r[VBE_DISPI_INDEX_X_OFFSET] = VBE_DISPI_MAX_XRES;

+    }

+    if (r[VBE_DISPI_INDEX_Y_OFFSET] > VBE_DISPI_MAX_YRES) {

+        r[VBE_DISPI_INDEX_Y_OFFSET] = VBE_DISPI_MAX_YRES;

+    }

+    offset = r[VBE_DISPI_INDEX_X_OFFSET] * bits / 8;

+    offset += r[VBE_DISPI_INDEX_Y_OFFSET] * linelength;

+    if (offset + r[VBE_DISPI_INDEX_YRES] * linelength > s->vbe_size) {

+        r[VBE_DISPI_INDEX_Y_OFFSET] = 0;

+        offset = r[VBE_DISPI_INDEX_X_OFFSET] * bits / 8;

+        if (offset + r[VBE_DISPI_INDEX_YRES] * linelength > s->vbe_size) {

+            r[VBE_DISPI_INDEX_X_OFFSET] = 0;

+            offset = 0;

+        }

+    }

+

+    /* update vga state */

+    r[VBE_DISPI_INDEX_VIRT_HEIGHT] = maxy;

+    s->vbe_line_offset = linelength;

+    s->vbe_start_addr  = offset / 4;

+}

+

 static uint32_t vbe_ioport_read_index(void *opaque, uint32_t addr)

 {

     VGACommonState *s = opaque;

@@ -648,22 +735,13 @@ void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val)

             }

             break;

         case VBE_DISPI_INDEX_XRES:

-            if ((val <= VBE_DISPI_MAX_XRES) && ((val & 7) == 0)) {

-                s->vbe_regs[s->vbe_index] = val;

-            }

-            break;

         case VBE_DISPI_INDEX_YRES:

-            if (val <= VBE_DISPI_MAX_YRES) {

-                s->vbe_regs[s->vbe_index] = val;

-            }

-            break;

         case VBE_DISPI_INDEX_BPP:

-            if (val == 0)

-                val = 8;

-            if (val == 4 || val == 8 || val == 15 ||

-                val == 16 || val == 24 || val == 32) {

-                s->vbe_regs[s->vbe_index] = val;

-            }

+        case VBE_DISPI_INDEX_VIRT_WIDTH:

+        case VBE_DISPI_INDEX_X_OFFSET:

+        case VBE_DISPI_INDEX_Y_OFFSET:

+            s->vbe_regs[s->vbe_index] = val;

+            vbe_fixup_regs(s);

             break;

         case VBE_DISPI_INDEX_BANK:

             if (s->vbe_regs[VBE_DISPI_INDEX_BPP] == 4) {

@@ -680,19 +758,11 @@ void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val)

                 !(s->vbe_regs[VBE_DISPI_INDEX_ENABLE] & VBE_DISPI_ENABLED)) {

                 int h, shift_control;

-                s->vbe_regs[VBE_DISPI_INDEX_VIRT_WIDTH] =

-                    s->vbe_regs[VBE_DISPI_INDEX_XRES];

-                s->vbe_regs[VBE_DISPI_INDEX_VIRT_HEIGHT] =

-                    s->vbe_regs[VBE_DISPI_INDEX_YRES];

+                s->vbe_regs[VBE_DISPI_INDEX_VIRT_WIDTH] = 0;

                 s->vbe_regs[VBE_DISPI_INDEX_X_OFFSET] = 0;

                 s->vbe_regs[VBE_DISPI_INDEX_Y_OFFSET] = 0;

-

-                if (s->vbe_regs[VBE_DISPI_INDEX_BPP] == 4)

-                    s->vbe_line_offset = s->vbe_regs[VBE_DISPI_INDEX_XRES] >> 1;

-                else

-                    s->vbe_line_offset = s->vbe_regs[VBE_DISPI_INDEX_XRES] *

-                        ((s->vbe_regs[VBE_DISPI_INDEX_BPP] + 7) >> 3);

-                s->vbe_start_addr = 0;

+                s->vbe_regs[VBE_DISPI_INDEX_ENABLE] |= VBE_DISPI_ENABLED;

+                vbe_fixup_regs(s);

                 /* clear the screen (should be done in BIOS) */

                 if (!(val & VBE_DISPI_NOCLEARMEM)) {

@@ -741,40 +811,6 @@ void vbe_ioport_write_data(void *opaque, uint32_t addr, uint32_t val)

             s->vbe_regs[s->vbe_index] = val;

             vga_update_memory_access(s);

             break;

-        case VBE_DISPI_INDEX_VIRT_WIDTH:

-            {

-                int w, h, line_offset;

-

-                if (val < s->vbe_regs[VBE_DISPI_INDEX_XRES])

-                    return;

-                w = val;

-                if (s->vbe_regs[VBE_DISPI_INDEX_BPP] == 4)

-                    line_offset = w >> 1;

-                else

-                    line_offset = w * ((s->vbe_regs[VBE_DISPI_INDEX_BPP] + 7) >> 3);

-                h = s->vbe_size / line_offset;

-                /* XXX: support weird bochs semantics ? */

-                if (h < s->vbe_regs[VBE_DISPI_INDEX_YRES])

-                    return;

-                s->vbe_regs[VBE_DISPI_INDEX_VIRT_WIDTH] = w;

-                s->vbe_regs[VBE_DISPI_INDEX_VIRT_HEIGHT] = h;

-                s->vbe_line_offset = line_offset;

-            }

-            break;

-        case VBE_DISPI_INDEX_X_OFFSET:

-        case VBE_DISPI_INDEX_Y_OFFSET:

-            {

-                int x;

-                s->vbe_regs[s->vbe_index] = val;

-                s->vbe_start_addr = s->vbe_line_offset * s->vbe_regs[VBE_DISPI_INDEX_Y_OFFSET];

-                x = s->vbe_regs[VBE_DISPI_INDEX_X_OFFSET];

-                if (s->vbe_regs[VBE_DISPI_INDEX_BPP] == 4)

-                    s->vbe_start_addr += x >> 1;

-                else

-                    s->vbe_start_addr += x * ((s->vbe_regs[VBE_DISPI_INDEX_BPP] + 7) >> 3);

-                s->vbe_start_addr >>= 2;

-            }

-            break;

         default:

             break;

         }

-- 

1.7.1