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ba28e0ff4d
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Philippe Mathieu-Daudé ba28e0ff4d hw/display/virtio-gpu: Protect from DMA re-entrancy bugs 
Replace qemu_bh_new_guarded() by virtio_bh_new_guarded()
so the bus and device use the same guard. Otherwise the
DMA-reentrancy protection can be bypassed:

  $ cat << EOF | qemu-system-i386 -display none -nodefaults \
                                  -machine q35,accel=qtest \
                                  -m 512M \
                                  -device virtio-gpu \
                                  -qtest stdio
  outl 0xcf8 0x80000820
  outl 0xcfc 0xe0004000
  outl 0xcf8 0x80000804
  outw 0xcfc 0x06
  write 0xe0004030 0x4 0x024000e0
  write 0xe0004028 0x1 0xff
  write 0xe0004020 0x4 0x00009300
  write 0xe000401c 0x1 0x01
  write 0x101 0x1 0x04
  write 0x103 0x1 0x1c
  write 0x9301c8 0x1 0x18
  write 0x105 0x1 0x1c
  write 0x107 0x1 0x1c
  write 0x109 0x1 0x1c
  write 0x10b 0x1 0x00
  write 0x10d 0x1 0x00
  write 0x10f 0x1 0x00
  write 0x111 0x1 0x00
  write 0x113 0x1 0x00
  write 0x115 0x1 0x00
  write 0x117 0x1 0x00
  write 0x119 0x1 0x00
  write 0x11b 0x1 0x00
  write 0x11d 0x1 0x00
  write 0x11f 0x1 0x00
  write 0x121 0x1 0x00
  write 0x123 0x1 0x00
  write 0x125 0x1 0x00
  write 0x127 0x1 0x00
  write 0x129 0x1 0x00
  write 0x12b 0x1 0x00
  write 0x12d 0x1 0x00
  write 0x12f 0x1 0x00
  write 0x131 0x1 0x00
  write 0x133 0x1 0x00
  write 0x135 0x1 0x00
  write 0x137 0x1 0x00
  write 0x139 0x1 0x00
  write 0xe0007003 0x1 0x00
  EOF
  ...
  =================================================================
  ==276099==ERROR: AddressSanitizer: heap-use-after-free on address 0x60d000011178
  at pc 0x562cc3b736c7 bp 0x7ffed49dee60 sp 0x7ffed49dee58
  READ of size 8 at 0x60d000011178 thread T0
      #0 0x562cc3b736c6 in virtio_gpu_ctrl_response hw/display/virtio-gpu.c:180:42
      #1 0x562cc3b7c40b in virtio_gpu_ctrl_response_nodata hw/display/virtio-gpu.c:192:5
      #2 0x562cc3b7c40b in virtio_gpu_simple_process_cmd hw/display/virtio-gpu.c:1015:13
      #3 0x562cc3b82873 in virtio_gpu_process_cmdq hw/display/virtio-gpu.c:1050:9
      #4 0x562cc4a85514 in aio_bh_call util/async.c:169:5
      #5 0x562cc4a85c52 in aio_bh_poll util/async.c:216:13
      #6 0x562cc4a1a79b in aio_dispatch util/aio-posix.c:423:5
      #7 0x562cc4a8a2da in aio_ctx_dispatch util/async.c:358:5
      #8 0x7f36840547a8 in g_main_context_dispatch (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x547a8)
      #9 0x562cc4a8b753 in glib_pollfds_poll util/main-loop.c:290:9
      #10 0x562cc4a8b753 in os_host_main_loop_wait util/main-loop.c:313:5
      #11 0x562cc4a8b753 in main_loop_wait util/main-loop.c:592:11
      #12 0x562cc3938186 in qemu_main_loop system/runstate.c:782:9
      #13 0x562cc43b7af5 in qemu_default_main system/main.c:37:14
      #14 0x7f3683a6c189 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
      #15 0x7f3683a6c244 in __libc_start_main csu/../csu/libc-start.c:381:3
      #16 0x562cc2a58ac0 in _start (qemu-system-i386+0x231bac0)

  0x60d000011178 is located 56 bytes inside of 136-byte region [0x60d000011140,0x60d0000111c8)
  freed by thread T0 here:
      #0 0x562cc2adb662 in __interceptor_free (qemu-system-i386+0x239e662)
      #1 0x562cc3b86b21 in virtio_gpu_reset hw/display/virtio-gpu.c:1524:9
      #2 0x562cc416e20e in virtio_reset hw/virtio/virtio.c:2145:9
      #3 0x562cc37c5644 in virtio_pci_reset hw/virtio/virtio-pci.c:2249:5
      #4 0x562cc4233758 in memory_region_write_accessor system/memory.c:497:5
      #5 0x562cc4232eea in access_with_adjusted_size system/memory.c:573:18

  previously allocated by thread T0 here:
      #0 0x562cc2adb90e in malloc (qemu-system-i386+0x239e90e)
      #1 0x7f368405a678 in g_malloc (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x5a678)
      #2 0x562cc4163ffc in virtqueue_split_pop hw/virtio/virtio.c:1612:12
      #3 0x562cc4163ffc in virtqueue_pop hw/virtio/virtio.c:1783:16
      #4 0x562cc3b91a95 in virtio_gpu_handle_ctrl hw/display/virtio-gpu.c:1112:15
      #5 0x562cc4a85514 in aio_bh_call util/async.c:169:5
      #6 0x562cc4a85c52 in aio_bh_poll util/async.c:216:13
      #7 0x562cc4a1a79b in aio_dispatch util/aio-posix.c:423:5

  SUMMARY: AddressSanitizer: heap-use-after-free hw/display/virtio-gpu.c:180:42 in virtio_gpu_ctrl_response

With this change, the same reproducer triggers:

  qemu-system-i386: warning: Blocked re-entrant IO on MemoryRegion: virtio-pci-common-virtio-gpu at addr: 0x6

Fixes: CVE-2024-3446
Cc: qemu-stable@nongnu.org
Reported-by: Alexander Bulekov <alxndr@bu.edu>
Reported-by: Yongkang Jia <kangel@zju.edu.cn>
Reported-by: Xiao Lei <nop.leixiao@gmail.com>
Reported-by: Yiming Tao <taoym@zju.edu.cn>
Buglink: https://bugs.launchpad.net/qemu/+bug/1888606
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20240409105537.18308-3-philmd@linaro.org>
2024-04-10 09:09:33 +02:00
..
9pfs
acpi hmat acpi: Fix out of bounds access due to missing use of indirection 2024-03-12 17:59:46 -04:00
adc
alpha
arm hw/arm/smmu: Avoid using inlined functions with external linkage again 2024-04-02 14:55:32 +02:00
audio virtio-snd: rewrite invalid tx/rx message handling 2024-04-09 02:31:16 -04:00
avr
block vhost-user-blk: simplify and fix vhost_user_blk_handle_config_change 2024-04-09 02:31:29 -04:00
char
core hw/clock: Let clock_set_mul_div() return a boolean value 2024-03-26 14:24:06 +01:00
cpu
cris
cxl hw/cxl/cxl-host: Fix missing ERRP_GUARD() in cxl_fixed_memory_window_config() 2024-03-12 17:56:55 -04:00
display hw/display/virtio-gpu: Protect from DMA re-entrancy bugs 2024-04-10 09:09:33 +02:00
dma
fsi
gpio * Fix timeouts in Travis-CI jobs 2024-03-25 14:19:42 +00:00
hppa
hyperv
i2c
i386 * lsi53c895a: fix assertion failure with invalid Block Move 2024-04-03 12:52:03 +01:00
ide
input
intc hw/intc/arm_gicv3: ICC_HPPIR* return SPURIOUS if int group is disabled 2024-04-02 10:02:44 +01:00
ipack
ipmi
isa
loongarch smbios: get rid of global smbios_ep_type 2024-03-18 08:42:45 -04:00
m68k
mem hw/mem/cxl_type3: Fix missing ERRP_GUARD() in ct3_realize() 2024-03-12 17:56:55 -04:00
microblaze hw/microblaze: Do not allow xlnx-zynqmp-pmu-soc to be created by the user 2024-03-25 09:57:43 +01:00
mips
misc hw/misc/stm32l4x5_rcc: Propagate period when enabling a clock 2024-03-26 14:24:06 +01:00
net Revert "hw/virtio: Add support for VDPA network simulation devices" 2024-04-09 02:30:18 -04:00
nios2
nubus
nvme hw/nvme: fix -Werror=maybe-uninitialized 2024-04-02 16:15:07 +02:00
nvram hw/nvram/mac_nvram: Report failure to write data 2024-03-25 10:41:01 +00:00
openrisc
pci virtio,pc,pci: features, cleanups, fixes 2024-03-13 15:11:53 +00:00
pci-bridge virtio,pc,pci: features, cleanups, fixes 2024-03-13 15:11:53 +00:00
pci-host
pcmcia
ppc hw/ppc/spapr: Include missing 'sysemu/tcg.h' header 2024-03-30 18:50:23 +10:00
rdma
remote
riscv target/riscv/kvm: fix timebase-frequency when using KVM acceleration 2024-03-22 15:41:01 +10:00
rtc
rx
s390x hw/core: Declare CPUArchId::cpu as CPUState instead of Object 2024-03-12 11:46:16 +01:00
scsi esp.c: remove explicit setting of DRQ within ESP state machine 2024-04-04 15:17:53 +01:00
sd
sensor
sh4
smbios hw/smbios: add stub for smbios_get_table_legacy() 2024-03-26 14:32:54 +01:00
sparc
sparc64
ssi aspeed/smc: Only wire flash devices at reset 2024-03-19 11:58:15 +01:00
timer
tpm
tricore
ufs
usb usb-audio: Fix invalid values in AudioControl descriptors 2024-04-01 19:47:40 +03:00
vfio vfio/iommufd: Fix memory leak 2024-03-19 11:56:37 +01:00
virtio hw/virtio: Introduce virtio_bh_new_guarded() helper 2024-04-10 09:09:33 +02:00
watchdog
xen Xen queue: 2024-03-12 21:32:31 +00:00
xenpv
xtensa
Kconfig
meson.build