diff options
Diffstat (limited to 'hw/display/qxl.c')
| -rw-r--r-- | hw/display/qxl.c | 42 |
1 files changed, 33 insertions, 9 deletions
diff --git a/hw/display/qxl.c b/hw/display/qxl.c index 5b10f697f1..6772849dec 100644 --- a/hw/display/qxl.c +++ b/hw/display/qxl.c @@ -274,7 +274,8 @@ static void qxl_spice_monitors_config_async(PCIQXLDevice *qxl, int replay) QXL_IO_MONITORS_CONFIG_ASYNC)); } - cfg = qxl_phys2virt(qxl, qxl->guest_monitors_config, MEMSLOT_GROUP_GUEST); + cfg = qxl_phys2virt(qxl, qxl->guest_monitors_config, MEMSLOT_GROUP_GUEST, + sizeof(QXLMonitorsConfig)); if (cfg != NULL && cfg->count == 1) { qxl->guest_primary.resized = 1; qxl->guest_head0_width = cfg->heads[0].width; @@ -459,7 +460,8 @@ static int qxl_track_command(PCIQXLDevice *qxl, struct QXLCommandExt *ext) switch (le32_to_cpu(ext->cmd.type)) { case QXL_CMD_SURFACE: { - QXLSurfaceCmd *cmd = qxl_phys2virt(qxl, ext->cmd.data, ext->group_id); + QXLSurfaceCmd *cmd = qxl_phys2virt(qxl, ext->cmd.data, ext->group_id, + sizeof(QXLSurfaceCmd)); if (!cmd) { return 1; @@ -494,7 +496,8 @@ static int qxl_track_command(PCIQXLDevice *qxl, struct QXLCommandExt *ext) } case QXL_CMD_CURSOR: { - QXLCursorCmd *cmd = qxl_phys2virt(qxl, ext->cmd.data, ext->group_id); + QXLCursorCmd *cmd = qxl_phys2virt(qxl, ext->cmd.data, ext->group_id, + sizeof(QXLCursorCmd)); if (!cmd) { return 1; @@ -1381,6 +1384,7 @@ static int qxl_add_memslot(PCIQXLDevice *d, uint32_t slot_id, uint64_t delta, qxl_set_guest_bug(d, "%s: pci_region = %d", __func__, pci_region); return 1; } + assert(guest_end - pci_start <= memory_region_size(mr)); virt_start = (intptr_t)memory_region_get_ram_ptr(mr); memslot.slot_id = slot_id; @@ -1421,11 +1425,13 @@ 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, @@ -1449,6 +1455,23 @@ 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; @@ -1456,7 +1479,8 @@ static bool qxl_get_check_slot_offset(PCIQXLDevice *qxl, QXLPHYSICAL pqxl, } /* can be also called from spice server thread context */ -void *qxl_phys2virt(PCIQXLDevice *qxl, QXLPHYSICAL pqxl, int group_id) +void *qxl_phys2virt(PCIQXLDevice *qxl, QXLPHYSICAL pqxl, int group_id, + size_t size) { uint64_t offset; uint32_t slot; @@ -1467,7 +1491,7 @@ 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); @@ -1933,9 +1957,9 @@ 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, @@ -1964,7 +1988,7 @@ static void qxl_dirty_surfaces(PCIQXLDevice *qxl) } cmd = qxl_phys2virt(qxl, qxl->guest_surfaces.cmds[i], - MEMSLOT_GROUP_GUEST); + MEMSLOT_GROUP_GUEST, sizeof(QXLSurfaceCmd)); assert(cmd); assert(cmd->type == QXL_SURFACE_CMD_CREATE); qxl_dirty_one_surface(qxl, cmd->u.surface_create.data, |