1 files changed, 103 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2022-4144.patch b/meta/recipes-devtools/qemu/qemu/CVE-2022-4144.patch
new file mode 100644
index 0000000000..3f0d5fbd5c
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2022-4144.patch
@@ -0,0 +1,103 @@
+From 6dbbf055148c6f1b7d8a3251a65bd6f3d1e1f622 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@linaro.org>
+Date: Mon, 28 Nov 2022 21:27:40 +0100
+Subject: [PATCH] hw/display/qxl: Avoid buffer overrun in qxl_phys2virt
+ (CVE-2022-4144)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Have qxl_get_check_slot_offset() return false if the requested
+buffer size does not fit within the slot memory region.
+
+Similarly qxl_phys2virt() now returns NULL in such case, and
+qxl_dirty_one_surface() aborts.
+
+This avoids buffer overrun in the host pointer returned by
+memory_region_get_ram_ptr().
+
+Fixes: CVE-2022-4144 (out-of-bounds read)
+Reported-by: Wenxu Yin (@awxylitol)
+Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1336
+
+Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
+Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
+Message-Id: <20221128202741.4945-5-philmd@linaro.org>
+
+Upstream-Status: Backport [https://gitlab.com/qemu-project/qemu/-/commit/6dbbf055148c6f1b7d8a3251a65bd6f3d1e1f622]
+CVE: CVE-2022-4144
+Comments: Deleted patch hunk in qxl.h,as it contains change
+in comments which is not present in current version of qemu.
+
+Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
+---
+ hw/display/qxl.c | 27 +++++++++++++++++++++++----
+ 1 file changed, 23 insertions(+), 4 deletions(-)
+
+diff --git a/hw/display/qxl.c b/hw/display/qxl.c
+index cd7eb39d..6bc8385b 100644
+--- a/hw/display/qxl.c
++++ b/hw/display/qxl.c
+@@ -1440,11 +1440,13 @@ static void qxl_reset_surfaces(PCIQXLDevice *d)
+ 
+ /* can be also called from spice server thread context */
+ static bool qxl_get_check_slot_offset(PCIQXLDevice *qxl, QXLPHYSICAL pqxl,
+-                                      uint32_t *s, uint64_t *o)
++                                      uint32_t *s, uint64_t *o,
++                                      size_t size_requested)
+ {
+     uint64_t phys   = le64_to_cpu(pqxl);
+     uint32_t slot   = (phys >> (64 -  8)) & 0xff;
+     uint64_t offset = phys & 0xffffffffffff;
++    uint64_t size_available;
+ 
+     if (slot >= NUM_MEMSLOTS) {
+         qxl_set_guest_bug(qxl, "slot too large %d >= %d", slot,
+@@ -1468,6 +1470,23 @@ static bool qxl_get_check_slot_offset(PCIQXLDevice *qxl, QXLPHYSICAL pqxl,
+                           slot, offset, qxl->guest_slots[slot].size);
+         return false;
+     }
++    size_available = memory_region_size(qxl->guest_slots[slot].mr);
++    if (qxl->guest_slots[slot].offset + offset >= size_available) {
++        qxl_set_guest_bug(qxl,
++                          "slot %d offset %"PRIu64" > region size %"PRIu64"\n",
++                          slot, qxl->guest_slots[slot].offset + offset,
++                          size_available);
++        return false;
++    }
++    size_available -= qxl->guest_slots[slot].offset + offset;
++    if (size_requested > size_available) {
++        qxl_set_guest_bug(qxl,
++                          "slot %d offset %"PRIu64" size %zu: "
++                          "overrun by %"PRIu64" bytes\n",
++                          slot, offset, size_requested,
++                          size_requested - size_available);
++        return false;
++    }
+ 
+     *s = slot;
+     *o = offset;
+@@ -1486,7 +1505,7 @@ void *qxl_phys2virt(PCIQXLDevice *qxl, QXLPHYSICAL pqxl, int group_id)
+         offset = le64_to_cpu(pqxl) & 0xffffffffffff;
+         return (void *)(intptr_t)offset;
+     case MEMSLOT_GROUP_GUEST:
+-        if (!qxl_get_check_slot_offset(qxl, pqxl, &slot, &offset)) {
++        if (!qxl_get_check_slot_offset(qxl, pqxl, &slot, &offset, size)) {
+             return NULL;
+         }
+         ptr = memory_region_get_ram_ptr(qxl->guest_slots[slot].mr);
+@@ -1944,9 +1963,9 @@ static void qxl_dirty_one_surface(PCIQXLDevice *qxl, QXLPHYSICAL pqxl,
+     uint32_t slot;
+     bool rc;
+ 
+-    rc = qxl_get_check_slot_offset(qxl, pqxl, &slot, &offset);
+-    assert(rc == true);
+     size = (uint64_t)height * abs(stride);
++    rc = qxl_get_check_slot_offset(qxl, pqxl, &slot, &offset, size);
++    assert(rc == true);
+     trace_qxl_surfaces_dirty(qxl->id, offset, size);
+     qxl_set_dirty(qxl->guest_slots[slot].mr,
+                   qxl->guest_slots[slot].offset + offset,
+-- 
+2.25.1
+