i8c-stream-rhel
changed/i8c-stream-rhel/qemu-kvm-6.2.0-52.module+el8.10.0+22232+1bd70159
MSVSphere Packaging Team
4 months ago
parent
5cc6622c57
commit
5bb5d3f6e3
@ -0,0 +1,61 @@
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From f4623ea611a74c684b0097b98a803cbe7ffb0825 Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Thu, 18 Jul 2024 09:26:55 -0400
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Subject: [PATCH 5/6] hw/char/virtio-serial-bus: Protect from DMA re-entrancy
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bugs
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 380: QEMU: virtio: DMA reentrancy issue leads to double free vulnerability
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RH-Jira: RHEL-32276
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RH-Acked-by: Gerd Hoffmann <None>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [5/6] fc8a445ebf6e763cd1482cd1f7ee23e5b5bbb388 (redhat/rhel/src/qemu-kvm/jons-qemu-kvm-2)
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JIRA: https://issues.redhat.com/browse/RHEL-32276
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CVE: CVE-2024-3446
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Upstream: Merged
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commit b4295bff25f7b50de1d9cc94a9c6effd40056bca
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Author: Philippe Mathieu-Daudé <philmd@linaro.org>
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Date: Thu Apr 4 20:56:35 2024 +0200
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hw/char/virtio-serial-bus: Protect from DMA re-entrancy bugs
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Replace qemu_bh_new_guarded() by virtio_bh_new_guarded()
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so the bus and device use the same guard. Otherwise the
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DMA-reentrancy protection can be bypassed.
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Fixes: CVE-2024-3446
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Cc: qemu-stable@nongnu.org
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Suggested-by: Alexander Bulekov <alxndr@bu.edu>
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Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
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Acked-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Message-Id: <20240409105537.18308-4-philmd@linaro.org>
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/char/virtio-serial-bus.c | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c
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index f18124b155..791b7ac59e 100644
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--- a/hw/char/virtio-serial-bus.c
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+++ b/hw/char/virtio-serial-bus.c
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@@ -985,8 +985,7 @@ static void virtser_port_device_realize(DeviceState *dev, Error **errp)
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return;
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}
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- port->bh = qemu_bh_new_guarded(flush_queued_data_bh, port,
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- &dev->mem_reentrancy_guard);
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+ port->bh = virtio_bh_new_guarded(dev, flush_queued_data_bh, port);
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port->elem = NULL;
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}
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--
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2.39.3
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@ -0,0 +1,160 @@
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From d37035373a266644b241aab1f041ab09c9185540 Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Thu, 18 Jul 2024 09:29:54 -0400
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Subject: [PATCH 4/6] hw/display/virtio-gpu: Protect from DMA re-entrancy bugs
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 380: QEMU: virtio: DMA reentrancy issue leads to double free vulnerability
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RH-Jira: RHEL-32276
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RH-Acked-by: Gerd Hoffmann <None>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [4/6] e3cd21742228528a1a74ea62d55b5941d3efb261 (redhat/rhel/src/qemu-kvm/jons-qemu-kvm-2)
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JIRA: https://issues.redhat.com/browse/RHEL-32276
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CVE: CVE-2024-3446
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Upstream: Merged
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commit ba28e0ff4d95b56dc334aac2730ab3651ffc3132
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Author: Philippe Mathieu-Daudé <philmd@linaro.org>
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Date: Thu Apr 4 20:56:27 2024 +0200
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hw/display/virtio-gpu: Protect from DMA re-entrancy bugs
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Replace qemu_bh_new_guarded() by virtio_bh_new_guarded()
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so the bus and device use the same guard. Otherwise the
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DMA-reentrancy protection can be bypassed:
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$ cat << EOF | qemu-system-i386 -display none -nodefaults \
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-machine q35,accel=qtest \
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-m 512M \
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-device virtio-gpu \
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-qtest stdio
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outl 0xcf8 0x80000820
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outl 0xcfc 0xe0004000
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outl 0xcf8 0x80000804
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outw 0xcfc 0x06
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write 0xe0004030 0x4 0x024000e0
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write 0xe0004028 0x1 0xff
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write 0xe0004020 0x4 0x00009300
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write 0xe000401c 0x1 0x01
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write 0x101 0x1 0x04
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write 0x103 0x1 0x1c
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write 0x9301c8 0x1 0x18
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write 0x105 0x1 0x1c
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write 0x107 0x1 0x1c
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write 0x109 0x1 0x1c
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write 0x10b 0x1 0x00
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write 0x10d 0x1 0x00
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write 0x10f 0x1 0x00
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write 0x111 0x1 0x00
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write 0x113 0x1 0x00
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write 0x115 0x1 0x00
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write 0x117 0x1 0x00
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write 0x119 0x1 0x00
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write 0x11b 0x1 0x00
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write 0x11d 0x1 0x00
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write 0x11f 0x1 0x00
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write 0x121 0x1 0x00
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write 0x123 0x1 0x00
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write 0x125 0x1 0x00
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write 0x127 0x1 0x00
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write 0x129 0x1 0x00
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write 0x12b 0x1 0x00
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write 0x12d 0x1 0x00
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write 0x12f 0x1 0x00
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write 0x131 0x1 0x00
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write 0x133 0x1 0x00
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write 0x135 0x1 0x00
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write 0x137 0x1 0x00
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write 0x139 0x1 0x00
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write 0xe0007003 0x1 0x00
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EOF
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...
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=================================================================
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==276099==ERROR: AddressSanitizer: heap-use-after-free on address 0x60d000011178
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at pc 0x562cc3b736c7 bp 0x7ffed49dee60 sp 0x7ffed49dee58
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READ of size 8 at 0x60d000011178 thread T0
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#0 0x562cc3b736c6 in virtio_gpu_ctrl_response hw/display/virtio-gpu.c:180:42
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#1 0x562cc3b7c40b in virtio_gpu_ctrl_response_nodata hw/display/virtio-gpu.c:192:5
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#2 0x562cc3b7c40b in virtio_gpu_simple_process_cmd hw/display/virtio-gpu.c:1015:13
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#3 0x562cc3b82873 in virtio_gpu_process_cmdq hw/display/virtio-gpu.c:1050:9
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#4 0x562cc4a85514 in aio_bh_call util/async.c:169:5
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#5 0x562cc4a85c52 in aio_bh_poll util/async.c:216:13
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#6 0x562cc4a1a79b in aio_dispatch util/aio-posix.c:423:5
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#7 0x562cc4a8a2da in aio_ctx_dispatch util/async.c:358:5
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#8 0x7f36840547a8 in g_main_context_dispatch (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x547a8)
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#9 0x562cc4a8b753 in glib_pollfds_poll util/main-loop.c:290:9
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#10 0x562cc4a8b753 in os_host_main_loop_wait util/main-loop.c:313:5
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#11 0x562cc4a8b753 in main_loop_wait util/main-loop.c:592:11
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#12 0x562cc3938186 in qemu_main_loop system/runstate.c:782:9
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#13 0x562cc43b7af5 in qemu_default_main system/main.c:37:14
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#14 0x7f3683a6c189 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
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#15 0x7f3683a6c244 in __libc_start_main csu/../csu/libc-start.c:381:3
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#16 0x562cc2a58ac0 in _start (qemu-system-i386+0x231bac0)
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0x60d000011178 is located 56 bytes inside of 136-byte region [0x60d000011140,0x60d0000111c8)
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freed by thread T0 here:
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#0 0x562cc2adb662 in __interceptor_free (qemu-system-i386+0x239e662)
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#1 0x562cc3b86b21 in virtio_gpu_reset hw/display/virtio-gpu.c:1524:9
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#2 0x562cc416e20e in virtio_reset hw/virtio/virtio.c:2145:9
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#3 0x562cc37c5644 in virtio_pci_reset hw/virtio/virtio-pci.c:2249:5
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#4 0x562cc4233758 in memory_region_write_accessor system/memory.c:497:5
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#5 0x562cc4232eea in access_with_adjusted_size system/memory.c:573:18
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previously allocated by thread T0 here:
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#0 0x562cc2adb90e in malloc (qemu-system-i386+0x239e90e)
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#1 0x7f368405a678 in g_malloc (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x5a678)
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#2 0x562cc4163ffc in virtqueue_split_pop hw/virtio/virtio.c:1612:12
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#3 0x562cc4163ffc in virtqueue_pop hw/virtio/virtio.c:1783:16
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#4 0x562cc3b91a95 in virtio_gpu_handle_ctrl hw/display/virtio-gpu.c:1112:15
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#5 0x562cc4a85514 in aio_bh_call util/async.c:169:5
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#6 0x562cc4a85c52 in aio_bh_poll util/async.c:216:13
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#7 0x562cc4a1a79b in aio_dispatch util/aio-posix.c:423:5
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SUMMARY: AddressSanitizer: heap-use-after-free hw/display/virtio-gpu.c:180:42 in virtio_gpu_ctrl_response
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With this change, the same reproducer triggers:
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qemu-system-i386: warning: Blocked re-entrant IO on MemoryRegion: virtio-pci-common-virtio-gpu at addr: 0x6
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Fixes: CVE-2024-3446
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Cc: qemu-stable@nongnu.org
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Reported-by: Alexander Bulekov <alxndr@bu.edu>
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Reported-by: Yongkang Jia <kangel@zju.edu.cn>
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Reported-by: Xiao Lei <nop.leixiao@gmail.com>
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Reported-by: Yiming Tao <taoym@zju.edu.cn>
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Buglink: https://bugs.launchpad.net/qemu/+bug/1888606
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Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
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Acked-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Message-Id: <20240409105537.18308-3-philmd@linaro.org>
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/display/virtio-gpu.c | 6 ++----
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1 file changed, 2 insertions(+), 4 deletions(-)
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diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
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index c28ce1ea72..64fdc18478 100644
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--- a/hw/display/virtio-gpu.c
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+++ b/hw/display/virtio-gpu.c
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@@ -1334,10 +1334,8 @@ void virtio_gpu_device_realize(DeviceState *qdev, Error **errp)
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g->ctrl_vq = virtio_get_queue(vdev, 0);
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g->cursor_vq = virtio_get_queue(vdev, 1);
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- g->ctrl_bh = qemu_bh_new_guarded(virtio_gpu_ctrl_bh, g,
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- &qdev->mem_reentrancy_guard);
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- g->cursor_bh = qemu_bh_new_guarded(virtio_gpu_cursor_bh, g,
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- &qdev->mem_reentrancy_guard);
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+ g->ctrl_bh = virtio_bh_new_guarded(qdev, virtio_gpu_ctrl_bh, g);
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+ g->cursor_bh = virtio_bh_new_guarded(qdev, virtio_gpu_cursor_bh, g);
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g->reset_bh = qemu_bh_new(virtio_gpu_reset_bh, g);
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qemu_cond_init(&g->reset_cond);
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QTAILQ_INIT(&g->reslist);
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--
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2.39.3
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@ -0,0 +1,86 @@
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From 1b62d61c495bf4cd3a819ab8d1ef024d153e0ece Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Thu, 18 Jul 2024 09:40:29 -0400
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Subject: [PATCH 3/6] hw/virtio: Introduce virtio_bh_new_guarded() helper
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 380: QEMU: virtio: DMA reentrancy issue leads to double free vulnerability
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RH-Jira: RHEL-32276
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RH-Acked-by: Gerd Hoffmann <None>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [3/6] 1cbde7ddb8393b72e2e8d457b5e2d739116567a9 (redhat/rhel/src/qemu-kvm/jons-qemu-kvm-2)
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JIRA: https://issues.redhat.com/browse/RHEL-32276
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CVE: CVE-2024-3446
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Upstream: Merged
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commit ec0504b989ca61e03636384d3602b7bf07ffe4da
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Author: Philippe Mathieu-Daudé <philmd@linaro.org>
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Date: Thu Apr 4 20:56:11 2024 +0200
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hw/virtio: Introduce virtio_bh_new_guarded() helper
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Introduce virtio_bh_new_guarded(), similar to qemu_bh_new_guarded()
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but using the transport memory guard, instead of the device one
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(there can only be one virtio device per virtio bus).
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Inspired-by: Gerd Hoffmann <kraxel@redhat.com>
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Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
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Acked-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Message-Id: <20240409105537.18308-2-philmd@linaro.org>
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/virtio/virtio.c | 10 ++++++++++
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include/hw/virtio/virtio.h | 7 +++++++
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2 files changed, 17 insertions(+)
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diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
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index ea7c079fb0..5ae9c44841 100644
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--- a/hw/virtio/virtio.c
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+++ b/hw/virtio/virtio.c
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@@ -3874,3 +3874,13 @@ static void virtio_register_types(void)
|
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}
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type_init(virtio_register_types)
|
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+
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+QEMUBH *virtio_bh_new_guarded_full(DeviceState *dev,
|
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+ QEMUBHFunc *cb, void *opaque,
|
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+ const char *name)
|
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+{
|
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+ DeviceState *transport = qdev_get_parent_bus(dev)->parent;
|
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+
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+ return qemu_bh_new_full(cb, opaque, name,
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+ &transport->mem_reentrancy_guard);
|
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+}
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diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
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index 8bab9cfb75..731c631a81 100644
|
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--- a/include/hw/virtio/virtio.h
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+++ b/include/hw/virtio/virtio.h
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@@ -22,6 +22,7 @@
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#include "standard-headers/linux/virtio_config.h"
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#include "standard-headers/linux/virtio_ring.h"
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#include "qom/object.h"
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+#include "block/aio.h"
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/* A guest should never accept this. It implies negotiation is broken. */
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#define VIRTIO_F_BAD_FEATURE 30
|
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@@ -397,4 +398,10 @@ static inline bool virtio_device_disabled(VirtIODevice *vdev)
|
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bool virtio_legacy_allowed(VirtIODevice *vdev);
|
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bool virtio_legacy_check_disabled(VirtIODevice *vdev);
|
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|
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+QEMUBH *virtio_bh_new_guarded_full(DeviceState *dev,
|
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+ QEMUBHFunc *cb, void *opaque,
|
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+ const char *name);
|
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+#define virtio_bh_new_guarded(dev, cb, opaque) \
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+ virtio_bh_new_guarded_full((dev), (cb), (opaque), (stringify(cb)))
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+
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#endif
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--
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2.39.3
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@ -0,0 +1,62 @@
|
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From 2ecbd673a0e2191821ce88128587f709936ad765 Mon Sep 17 00:00:00 2001
|
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From: Jon Maloy <jmaloy@redhat.com>
|
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Date: Thu, 18 Jul 2024 09:21:27 -0400
|
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Subject: [PATCH 6/6] hw/virtio/virtio-crypto: Protect from DMA re-entrancy
|
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bugs
|
||||
MIME-Version: 1.0
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||||
Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
|
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|
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RH-Author: Jon Maloy <jmaloy@redhat.com>
|
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RH-MergeRequest: 380: QEMU: virtio: DMA reentrancy issue leads to double free vulnerability
|
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RH-Jira: RHEL-32276
|
||||
RH-Acked-by: Gerd Hoffmann <None>
|
||||
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
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RH-Commit: [6/6] 975ac4640fd8e7cbf3820757787ee7b1270173be (redhat/rhel/src/qemu-kvm/jons-qemu-kvm-2)
|
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|
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JIRA: https://issues.redhat.com/browse/RHEL-32276
|
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CVE: CVE-2024-3446
|
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Upstream: Merged
|
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|
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commit f4729ec39ad97a42ceaa7b5697f84f440ea6e5dc
|
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Author: Philippe Mathieu-Daudé <philmd@linaro.org>
|
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Date: Thu Apr 4 20:56:41 2024 +0200
|
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|
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hw/virtio/virtio-crypto: 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.
|
||||
|
||||
Fixes: CVE-2024-3446
|
||||
Cc: qemu-stable@nongnu.org
|
||||
Suggested-by: Alexander Bulekov <alxndr@bu.edu>
|
||||
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: <20240409105537.18308-5-philmd@linaro.org>
|
||||
|
||||
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
|
||||
---
|
||||
hw/virtio/virtio-crypto.c | 4 ++--
|
||||
1 file changed, 2 insertions(+), 2 deletions(-)
|
||||
|
||||
diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c
|
||||
index 1be7bb543c..1741d4aba1 100644
|
||||
--- a/hw/virtio/virtio-crypto.c
|
||||
+++ b/hw/virtio/virtio-crypto.c
|
||||
@@ -817,8 +817,8 @@ static void virtio_crypto_device_realize(DeviceState *dev, Error **errp)
|
||||
vcrypto->vqs[i].dataq =
|
||||
virtio_add_queue(vdev, 1024, virtio_crypto_handle_dataq_bh);
|
||||
vcrypto->vqs[i].dataq_bh =
|
||||
- qemu_bh_new_guarded(virtio_crypto_dataq_bh, &vcrypto->vqs[i],
|
||||
- &dev->mem_reentrancy_guard);
|
||||
+ virtio_bh_new_guarded(dev, virtio_crypto_dataq_bh,
|
||||
+ &vcrypto->vqs[i]);
|
||||
vcrypto->vqs[i].vcrypto = vcrypto;
|
||||
}
|
||||
|
||||
--
|
||||
2.39.3
|
||||
|
||||
@ -0,0 +1,187 @@
|
||||
From adfddc25c82576458442f61efb913e44d83bcbd0 Mon Sep 17 00:00:00 2001
|
||||
From: Eric Blake <eblake@redhat.com>
|
||||
Date: Tue, 6 Aug 2024 13:53:00 -0500
|
||||
Subject: [PATCH 2/5] nbd/server: CVE-2024-7409: Cap default max-connections to
|
||||
100
|
||||
MIME-Version: 1.0
|
||||
Content-Type: text/plain; charset=UTF-8
|
||||
Content-Transfer-Encoding: 8bit
|
||||
|
||||
RH-Author: Eric Blake <eblake@redhat.com>
|
||||
RH-MergeRequest: 388: nbd/server: fix CVE-2024-7409 (qemu crash on nbd-server-stop) [rhel-8.10.z]
|
||||
RH-Jira: RHEL-52611
|
||||
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
||||
RH-Acked-by: Richard W.M. Jones <rjones@redhat.com>
|
||||
RH-Commit: [2/4] 1f5d88d5644c46cbb957778254a993930b9d86dc (ebblake/qemu-kvm)
|
||||
|
||||
Allowing an unlimited number of clients to any web service is a recipe
|
||||
for a rudimentary denial of service attack: the client merely needs to
|
||||
open lots of sockets without closing them, until qemu no longer has
|
||||
any more fds available to allocate.
|
||||
|
||||
For qemu-nbd, we default to allowing only 1 connection unless more are
|
||||
explicitly asked for (-e or --shared); this was historically picked as
|
||||
a nice default (without an explicit -t, a non-persistent qemu-nbd goes
|
||||
away after a client disconnects, without needing any additional
|
||||
follow-up commands), and we are not going to change that interface now
|
||||
(besides, someday we want to point people towards qemu-storage-daemon
|
||||
instead of qemu-nbd).
|
||||
|
||||
But for qemu proper, and the newer qemu-storage-daemon, the QMP
|
||||
nbd-server-start command has historically had a default of unlimited
|
||||
number of connections, in part because unlike qemu-nbd it is
|
||||
inherently persistent until nbd-server-stop. Allowing multiple client
|
||||
sockets is particularly useful for clients that can take advantage of
|
||||
MULTI_CONN (creating parallel sockets to increase throughput),
|
||||
although known clients that do so (such as libnbd's nbdcopy) typically
|
||||
use only 8 or 16 connections (the benefits of scaling diminish once
|
||||
more sockets are competing for kernel attention). Picking a number
|
||||
large enough for typical use cases, but not unlimited, makes it
|
||||
slightly harder for a malicious client to perform a denial of service
|
||||
merely by opening lots of connections withot progressing through the
|
||||
handshake.
|
||||
|
||||
This change does not eliminate CVE-2024-7409 on its own, but reduces
|
||||
the chance for fd exhaustion or unlimited memory usage as an attack
|
||||
surface. On the other hand, by itself, it makes it more obvious that
|
||||
with a finite limit, we have the problem of an unauthenticated client
|
||||
holding 100 fds opened as a way to block out a legitimate client from
|
||||
being able to connect; thus, later patches will further add timeouts
|
||||
to reject clients that are not making progress.
|
||||
|
||||
This is an INTENTIONAL change in behavior, and will break any client
|
||||
of nbd-server-start that was not passing an explicit max-connections
|
||||
parameter, yet expects more than 100 simultaneous connections. We are
|
||||
not aware of any such client (as stated above, most clients aware of
|
||||
MULTI_CONN get by just fine on 8 or 16 connections, and probably cope
|
||||
with later connections failing by relying on the earlier connections;
|
||||
libvirt has not yet been passing max-connections, but generally
|
||||
creates NBD servers with the intent for a single client for the sake
|
||||
of live storage migration; meanwhile, the KubeSAN project anticipates
|
||||
a large cluster sharing multiple clients [up to 8 per node, and up to
|
||||
100 nodes in a cluster], but it currently uses qemu-nbd with an
|
||||
explicit --shared=0 rather than qemu-storage-daemon with
|
||||
nbd-server-start).
|
||||
|
||||
We considered using a deprecation period (declare that omitting
|
||||
max-parameters is deprecated, and make it mandatory in 3 releases -
|
||||
then we don't need to pick an arbitrary default); that has zero risk
|
||||
of breaking any apps that accidentally depended on more than 100
|
||||
connections, and where such breakage might not be noticed under unit
|
||||
testing but only under the larger loads of production usage. But it
|
||||
does not close the denial-of-service hole until far into the future,
|
||||
and requires all apps to change to add the parameter even if 100 was
|
||||
good enough. It also has a drawback that any app (like libvirt) that
|
||||
is accidentally relying on an unlimited default should seriously
|
||||
consider their own CVE now, at which point they are going to change to
|
||||
pass explicit max-connections sooner than waiting for 3 qemu releases.
|
||||
Finally, if our changed default breaks an app, that app can always
|
||||
pass in an explicit max-parameters with a larger value.
|
||||
|
||||
It is also intentional that the HMP interface to nbd-server-start is
|
||||
not changed to expose max-connections (any client needing to fine-tune
|
||||
things should be using QMP).
|
||||
|
||||
Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
|
||||
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||||
Message-ID: <20240807174943.771624-12-eblake@redhat.com>
|
||||
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
|
||||
[ericb: Expand commit message to summarize Dan's argument for why we
|
||||
break corner-case back-compat behavior without a deprecation period]
|
||||
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||||
|
||||
(cherry picked from commit c8a76dbd90c2f48df89b75bef74917f90a59b623)
|
||||
Conflicts:
|
||||
qapi/block-export.json - context (no multi-conn, older format)
|
||||
Jira: https://issues.redhat.com/browse/RHEL-52611
|
||||
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||||
---
|
||||
block/monitor/block-hmp-cmds.c | 3 ++-
|
||||
blockdev-nbd.c | 8 ++++++++
|
||||
include/block/nbd.h | 7 +++++++
|
||||
qapi/block-export.json | 4 ++--
|
||||
4 files changed, 19 insertions(+), 3 deletions(-)
|
||||
|
||||
diff --git a/block/monitor/block-hmp-cmds.c b/block/monitor/block-hmp-cmds.c
|
||||
index 2ac4aedfff..32a666b5dc 100644
|
||||
--- a/block/monitor/block-hmp-cmds.c
|
||||
+++ b/block/monitor/block-hmp-cmds.c
|
||||
@@ -411,7 +411,8 @@ void hmp_nbd_server_start(Monitor *mon, const QDict *qdict)
|
||||
goto exit;
|
||||
}
|
||||
|
||||
- nbd_server_start(addr, NULL, NULL, 0, &local_err);
|
||||
+ nbd_server_start(addr, NULL, NULL, NBD_DEFAULT_MAX_CONNECTIONS,
|
||||
+ &local_err);
|
||||
qapi_free_SocketAddress(addr);
|
||||
if (local_err != NULL) {
|
||||
goto exit;
|
||||
diff --git a/blockdev-nbd.c b/blockdev-nbd.c
|
||||
index b9e8dc78f3..4bd90bac16 100644
|
||||
--- a/blockdev-nbd.c
|
||||
+++ b/blockdev-nbd.c
|
||||
@@ -171,6 +171,10 @@ void nbd_server_start(SocketAddress *addr, const char *tls_creds,
|
||||
|
||||
void nbd_server_start_options(NbdServerOptions *arg, Error **errp)
|
||||
{
|
||||
+ if (!arg->has_max_connections) {
|
||||
+ arg->max_connections = NBD_DEFAULT_MAX_CONNECTIONS;
|
||||
+ }
|
||||
+
|
||||
nbd_server_start(arg->addr, arg->tls_creds, arg->tls_authz,
|
||||
arg->max_connections, errp);
|
||||
}
|
||||
@@ -183,6 +187,10 @@ void qmp_nbd_server_start(SocketAddressLegacy *addr,
|
||||
{
|
||||
SocketAddress *addr_flat = socket_address_flatten(addr);
|
||||
|
||||
+ if (!has_max_connections) {
|
||||
+ max_connections = NBD_DEFAULT_MAX_CONNECTIONS;
|
||||
+ }
|
||||
+
|
||||
nbd_server_start(addr_flat, tls_creds, tls_authz, max_connections, errp);
|
||||
qapi_free_SocketAddress(addr_flat);
|
||||
}
|
||||
diff --git a/include/block/nbd.h b/include/block/nbd.h
|
||||
index b71a297249..a31c34a8a6 100644
|
||||
--- a/include/block/nbd.h
|
||||
+++ b/include/block/nbd.h
|
||||
@@ -33,6 +33,13 @@ extern const BlockExportDriver blk_exp_nbd;
|
||||
*/
|
||||
#define NBD_DEFAULT_HANDSHAKE_MAX_SECS 10
|
||||
|
||||
+/*
|
||||
+ * NBD_DEFAULT_MAX_CONNECTIONS: Number of client sockets to allow at
|
||||
+ * once; must be large enough to allow a MULTI_CONN-aware client like
|
||||
+ * nbdcopy to create its typical number of 8-16 sockets.
|
||||
+ */
|
||||
+#define NBD_DEFAULT_MAX_CONNECTIONS 100
|
||||
+
|
||||
/* Handshake phase structs - this struct is passed on the wire */
|
||||
|
||||
struct NBDOption {
|
||||
diff --git a/qapi/block-export.json b/qapi/block-export.json
|
||||
index c1b92ce1c1..181d7238fe 100644
|
||||
--- a/qapi/block-export.json
|
||||
+++ b/qapi/block-export.json
|
||||
@@ -21,7 +21,7 @@
|
||||
# recreated on the fly while the NBD server is active.
|
||||
# If missing, it will default to denying access (since 4.0).
|
||||
# @max-connections: The maximum number of connections to allow at the same
|
||||
-# time, 0 for unlimited. (since 5.2; default: 0)
|
||||
+# time, 0 for unlimited. (since 5.2; default: 100)
|
||||
#
|
||||
# Since: 4.2
|
||||
##
|
||||
@@ -50,7 +50,7 @@
|
||||
# recreated on the fly while the NBD server is active.
|
||||
# If missing, it will default to denying access (since 4.0).
|
||||
# @max-connections: The maximum number of connections to allow at the same
|
||||
-# time, 0 for unlimited. (since 5.2; default: 0)
|
||||
+# time, 0 for unlimited. (since 5.2; default: 100)
|
||||
#
|
||||
# Returns: error if the server is already running.
|
||||
#
|
||||
--
|
||||
2.39.3
|
||||
|
||||
@ -0,0 +1,180 @@
|
||||
From 4ab086cdf9a5842c49f3fe59baff1747d863b97a Mon Sep 17 00:00:00 2001
|
||||
From: Eric Blake <eblake@redhat.com>
|
||||
Date: Wed, 7 Aug 2024 12:23:13 -0500
|
||||
Subject: [PATCH 4/5] nbd/server: CVE-2024-7409: Close stray clients at
|
||||
server-stop
|
||||
MIME-Version: 1.0
|
||||
Content-Type: text/plain; charset=UTF-8
|
||||
Content-Transfer-Encoding: 8bit
|
||||
|
||||
RH-Author: Eric Blake <eblake@redhat.com>
|
||||
RH-MergeRequest: 388: nbd/server: fix CVE-2024-7409 (qemu crash on nbd-server-stop) [rhel-8.10.z]
|
||||
RH-Jira: RHEL-52611
|
||||
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
||||
RH-Acked-by: Richard W.M. Jones <rjones@redhat.com>
|
||||
RH-Commit: [4/4] 92a20764dbee3cf94181cab412d90cbf92b4a417 (ebblake/qemu-kvm)
|
||||
|
||||
A malicious client can attempt to connect to an NBD server, and then
|
||||
intentionally delay progress in the handshake, including if it does
|
||||
not know the TLS secrets. Although the previous two patches reduce
|
||||
this behavior by capping the default max-connections parameter and
|
||||
killing slow clients, they did not eliminate the possibility of a
|
||||
client waiting to close the socket until after the QMP nbd-server-stop
|
||||
command is executed, at which point qemu would SEGV when trying to
|
||||
dereference the NULL nbd_server global which is no longer present.
|
||||
This amounts to a denial of service attack. Worse, if another NBD
|
||||
server is started before the malicious client disconnects, I cannot
|
||||
rule out additional adverse effects when the old client interferes
|
||||
with the connection count of the new server (although the most likely
|
||||
is a crash due to an assertion failure when checking
|
||||
nbd_server->connections > 0).
|
||||
|
||||
For environments without this patch, the CVE can be mitigated by
|
||||
ensuring (such as via a firewall) that only trusted clients can
|
||||
connect to an NBD server. Note that using frameworks like libvirt
|
||||
that ensure that TLS is used and that nbd-server-stop is not executed
|
||||
while any trusted clients are still connected will only help if there
|
||||
is also no possibility for an untrusted client to open a connection
|
||||
but then stall on the NBD handshake.
|
||||
|
||||
Given the previous patches, it would be possible to guarantee that no
|
||||
clients remain connected by having nbd-server-stop sleep for longer
|
||||
than the default handshake deadline before finally freeing the global
|
||||
nbd_server object, but that could make QMP non-responsive for a long
|
||||
time. So intead, this patch fixes the problem by tracking all client
|
||||
sockets opened while the server is running, and forcefully closing any
|
||||
such sockets remaining without a completed handshake at the time of
|
||||
nbd-server-stop, then waiting until the coroutines servicing those
|
||||
sockets notice the state change. nbd-server-stop now has a second
|
||||
AIO_WAIT_WHILE_UNLOCKED (the first is indirectly through the
|
||||
blk_exp_close_all_type() that disconnects all clients that completed
|
||||
handshakes), but forced socket shutdown is enough to progress the
|
||||
coroutines and quickly tear down all clients before the server is
|
||||
freed, thus finally fixing the CVE.
|
||||
|
||||
This patch relies heavily on the fact that nbd/server.c guarantees
|
||||
that it only calls nbd_blockdev_client_closed() from the main loop
|
||||
(see the assertion in nbd_client_put() and the hoops used in
|
||||
nbd_client_put_nonzero() to achieve that); if we did not have that
|
||||
guarantee, we would also need a mutex protecting our accesses of the
|
||||
list of connections to survive re-entrancy from independent iothreads.
|
||||
|
||||
Although I did not actually try to test old builds, it looks like this
|
||||
problem has existed since at least commit 862172f45c (v2.12.0, 2017) -
|
||||
even back when that patch started using a QIONetListener to handle
|
||||
listening on multiple sockets, nbd_server_free() was already unaware
|
||||
that the nbd_blockdev_client_closed callback can be reached later by a
|
||||
client thread that has not completed handshakes (and therefore the
|
||||
client's socket never got added to the list closed in
|
||||
nbd_export_close_all), despite that patch intentionally tearing down
|
||||
the QIONetListener to prevent new clients.
|
||||
|
||||
Reported-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
|
||||
Fixes: CVE-2024-7409
|
||||
CC: qemu-stable@nongnu.org
|
||||
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||||
Message-ID: <20240807174943.771624-14-eblake@redhat.com>
|
||||
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
|
||||
|
||||
(cherry picked from commit 3e7ef738c8462c45043a1d39f702a0990406a3b3)
|
||||
Conflicts:
|
||||
- blockdev-nbd.c:
|
||||
- qemu_in_main_thread() not backported, but only used in assertions so
|
||||
safe to drop
|
||||
- AIO_WAIT_WHILE_UNLOCKED() not backported, use AIO_WAIT_WHILE() like
|
||||
blk_exp_close_all_type()
|
||||
Jira: https://issues.redhat.com/browse/RHEL-52611
|
||||
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||||
---
|
||||
blockdev-nbd.c | 35 ++++++++++++++++++++++++++++++++++-
|
||||
1 file changed, 34 insertions(+), 1 deletion(-)
|
||||
|
||||
diff --git a/blockdev-nbd.c b/blockdev-nbd.c
|
||||
index 4bd90bac16..87839c180b 100644
|
||||
--- a/blockdev-nbd.c
|
||||
+++ b/blockdev-nbd.c
|
||||
@@ -21,12 +21,18 @@
|
||||
#include "io/channel-socket.h"
|
||||
#include "io/net-listener.h"
|
||||
|
||||
+typedef struct NBDConn {
|
||||
+ QIOChannelSocket *cioc;
|
||||
+ QLIST_ENTRY(NBDConn) next;
|
||||
+} NBDConn;
|
||||
+
|
||||
typedef struct NBDServerData {
|
||||
QIONetListener *listener;
|
||||
QCryptoTLSCreds *tlscreds;
|
||||
char *tlsauthz;
|
||||
uint32_t max_connections;
|
||||
uint32_t connections;
|
||||
+ QLIST_HEAD(, NBDConn) conns;
|
||||
} NBDServerData;
|
||||
|
||||
static NBDServerData *nbd_server;
|
||||
@@ -46,6 +52,14 @@ bool nbd_server_is_running(void)
|
||||
|
||||
static void nbd_blockdev_client_closed(NBDClient *client, bool ignored)
|
||||
{
|
||||
+ NBDConn *conn = nbd_client_owner(client);
|
||||
+
|
||||
+ assert(nbd_server);
|
||||
+
|
||||
+ object_unref(OBJECT(conn->cioc));
|
||||
+ QLIST_REMOVE(conn, next);
|
||||
+ g_free(conn);
|
||||
+
|
||||
nbd_client_put(client);
|
||||
assert(nbd_server->connections > 0);
|
||||
nbd_server->connections--;
|
||||
@@ -55,14 +69,20 @@ static void nbd_blockdev_client_closed(NBDClient *client, bool ignored)
|
||||
static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
|
||||
gpointer opaque)
|
||||
{
|
||||
+ NBDConn *conn = g_new0(NBDConn, 1);
|
||||
+
|
||||
+ assert(nbd_server);
|
||||
nbd_server->connections++;
|
||||
+ object_ref(OBJECT(cioc));
|
||||
+ conn->cioc = cioc;
|
||||
+ QLIST_INSERT_HEAD(&nbd_server->conns, conn, next);
|
||||
nbd_update_server_watch(nbd_server);
|
||||
|
||||
qio_channel_set_name(QIO_CHANNEL(cioc), "nbd-server");
|
||||
/* TODO - expose handshake timeout as QMP option */
|
||||
nbd_client_new(cioc, NBD_DEFAULT_HANDSHAKE_MAX_SECS,
|
||||
nbd_server->tlscreds, nbd_server->tlsauthz,
|
||||
- nbd_blockdev_client_closed, NULL);
|
||||
+ nbd_blockdev_client_closed, conn);
|
||||
}
|
||||
|
||||
static void nbd_update_server_watch(NBDServerData *s)
|
||||
@@ -76,12 +96,25 @@ static void nbd_update_server_watch(NBDServerData *s)
|
||||
|
||||
static void nbd_server_free(NBDServerData *server)
|
||||
{
|
||||
+ NBDConn *conn, *tmp;
|
||||
+
|
||||
if (!server) {
|
||||
return;
|
||||
}
|
||||
|
||||
+ /*
|
||||
+ * Forcefully close the listener socket, and any clients that have
|
||||
+ * not yet disconnected on their own.
|
||||
+ */
|
||||
qio_net_listener_disconnect(server->listener);
|
||||
object_unref(OBJECT(server->listener));
|
||||
+ QLIST_FOREACH_SAFE(conn, &server->conns, next, tmp) {
|
||||
+ qio_channel_shutdown(QIO_CHANNEL(conn->cioc), QIO_CHANNEL_SHUTDOWN_BOTH,
|
||||
+ NULL);
|
||||
+ }
|
||||
+
|
||||
+ AIO_WAIT_WHILE(NULL, server->connections > 0);
|
||||
+
|
||||
if (server->tlscreds) {
|
||||
object_unref(OBJECT(server->tlscreds));
|
||||
}
|
||||
--
|
||||
2.39.3
|
||||
|
||||
@ -0,0 +1,135 @@
|
||||
From faac5261d5a9af155950c4e7779c5a4721562824 Mon Sep 17 00:00:00 2001
|
||||
From: Eric Blake <eblake@redhat.com>
|
||||
Date: Thu, 8 Aug 2024 16:05:08 -0500
|
||||
Subject: [PATCH 3/5] nbd/server: CVE-2024-7409: Drop non-negotiating clients
|
||||
MIME-Version: 1.0
|
||||
Content-Type: text/plain; charset=UTF-8
|
||||
Content-Transfer-Encoding: 8bit
|
||||
|
||||
RH-Author: Eric Blake <eblake@redhat.com>
|
||||
RH-MergeRequest: 388: nbd/server: fix CVE-2024-7409 (qemu crash on nbd-server-stop) [rhel-8.10.z]
|
||||
RH-Jira: RHEL-52611
|
||||
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
||||
RH-Acked-by: Richard W.M. Jones <rjones@redhat.com>
|
||||
RH-Commit: [3/4] 8c39829f8efbded9af018a4b915af266a55a793a (ebblake/qemu-kvm)
|
||||
|
||||
A client that opens a socket but does not negotiate is merely hogging
|
||||
qemu's resources (an open fd and a small amount of memory); and a
|
||||
malicious client that can access the port where NBD is listening can
|
||||
attempt a denial of service attack by intentionally opening and
|
||||
abandoning lots of unfinished connections. The previous patch put a
|
||||
default bound on the number of such ongoing connections, but once that
|
||||
limit is hit, no more clients can connect (including legitimate ones).
|
||||
The solution is to insist that clients complete handshake within a
|
||||
reasonable time limit, defaulting to 10 seconds. A client that has
|
||||
not successfully completed NBD_OPT_GO by then (including the case of
|
||||
where the client didn't know TLS credentials to even reach the point
|
||||
of NBD_OPT_GO) is wasting our time and does not deserve to stay
|
||||
connected. Later patches will allow fine-tuning the limit away from
|
||||
the default value (including disabling it for doing integration
|
||||
testing of the handshake process itself).
|
||||
|
||||
Note that this patch in isolation actually makes it more likely to see
|
||||
qemu SEGV after nbd-server-stop, as any client socket still connected
|
||||
when the server shuts down will now be closed after 10 seconds rather
|
||||
than at the client's whims. That will be addressed in the next patch.
|
||||
|
||||
For a demo of this patch in action:
|
||||
$ qemu-nbd -f raw -r -t -e 10 file &
|
||||
$ nbdsh --opt-mode -c '
|
||||
H = list()
|
||||
for i in range(20):
|
||||
print(i)
|
||||
H.insert(i, nbd.NBD())
|
||||
H[i].set_opt_mode(True)
|
||||
H[i].connect_uri("nbd://localhost")
|
||||
'
|
||||
$ kill $!
|
||||
|
||||
where later connections get to start progressing once earlier ones are
|
||||
forcefully dropped for taking too long, rather than hanging.
|
||||
|
||||
Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
|
||||
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||||
Message-ID: <20240807174943.771624-13-eblake@redhat.com>
|
||||
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
|
||||
[eblake: rebase to changes earlier in series, reduce scope of timer]
|
||||
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||||
|
||||
(cherry picked from commit b9b72cb3ce15b693148bd09cef7e50110566d8a0)
|
||||
Conflicts:
|
||||
nbd/server.c - context with different aiocontext locking
|
||||
nbd/trace-events - context with no client-connection.c
|
||||
Jira: https://issues.redhat.com/browse/RHEL-52611
|
||||
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||||
---
|
||||
nbd/server.c | 28 +++++++++++++++++++++++++++-
|
||||
nbd/trace-events | 1 +
|
||||
2 files changed, 28 insertions(+), 1 deletion(-)
|
||||
|
||||
diff --git a/nbd/server.c b/nbd/server.c
|
||||
index cc1b6838bf..1265068f70 100644
|
||||
--- a/nbd/server.c
|
||||
+++ b/nbd/server.c
|
||||
@@ -2701,22 +2701,48 @@ static void nbd_client_receive_next_request(NBDClient *client)
|
||||
}
|
||||
}
|
||||
|
||||
+static void nbd_handshake_timer_cb(void *opaque)
|
||||
+{
|
||||
+ QIOChannel *ioc = opaque;
|
||||
+
|
||||
+ trace_nbd_handshake_timer_cb();
|
||||
+ qio_channel_shutdown(ioc, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
|
||||
+}
|
||||
+
|
||||
static coroutine_fn void nbd_co_client_start(void *opaque)
|
||||
{
|
||||
NBDClient *client = opaque;
|
||||
Error *local_err = NULL;
|
||||
+ QEMUTimer *handshake_timer = NULL;
|
||||
|
||||
qemu_co_mutex_init(&client->send_lock);
|
||||
|
||||
- /* TODO - utilize client->handshake_max_secs */
|
||||
+ /*
|
||||
+ * Create a timer to bound the time spent in negotiation. If the
|
||||
+ * timer expires, it is likely nbd_negotiate will fail because the
|
||||
+ * socket was shutdown.
|
||||
+ */
|
||||
+ if (client->handshake_max_secs > 0) {
|
||||
+ handshake_timer = aio_timer_new(qemu_get_aio_context(),
|
||||
+ QEMU_CLOCK_REALTIME,
|
||||
+ SCALE_NS,
|
||||
+ nbd_handshake_timer_cb,
|
||||
+ client->sioc);
|
||||
+ timer_mod(handshake_timer,
|
||||
+ qemu_clock_get_ns(QEMU_CLOCK_REALTIME) +
|
||||
+ client->handshake_max_secs * NANOSECONDS_PER_SECOND);
|
||||
+ }
|
||||
+
|
||||
if (nbd_negotiate(client, &local_err)) {
|
||||
if (local_err) {
|
||||
error_report_err(local_err);
|
||||
}
|
||||
+ timer_free(handshake_timer);
|
||||
client_close(client, false);
|
||||
return;
|
||||
}
|
||||
|
||||
+ timer_free(handshake_timer);
|
||||
nbd_client_receive_next_request(client);
|
||||
}
|
||||
|
||||
diff --git a/nbd/trace-events b/nbd/trace-events
|
||||
index c4919a2dd5..553546f1f2 100644
|
||||
--- a/nbd/trace-events
|
||||
+++ b/nbd/trace-events
|
||||
@@ -73,3 +73,4 @@ nbd_co_receive_request_decode_type(uint64_t handle, uint16_t type, const char *n
|
||||
nbd_co_receive_request_payload_received(uint64_t handle, uint32_t len) "Payload received: handle = %" PRIu64 ", len = %" PRIu32
|
||||
nbd_co_receive_align_compliance(const char *op, uint64_t from, uint32_t len, uint32_t align) "client sent non-compliant unaligned %s request: from=0x%" PRIx64 ", len=0x%" PRIx32 ", align=0x%" PRIx32
|
||||
nbd_trip(void) "Reading request"
|
||||
+nbd_handshake_timer_cb(void) "client took too long to negotiate"
|
||||
--
|
||||
2.39.3
|
||||
|
||||
@ -0,0 +1,174 @@
|
||||
From 0d204cb81aec2b13254a0bd53938f53bfea81cb5 Mon Sep 17 00:00:00 2001
|
||||
From: Eric Blake <eblake@redhat.com>
|
||||
Date: Wed, 7 Aug 2024 08:50:01 -0500
|
||||
Subject: [PATCH 1/5] nbd/server: Plumb in new args to nbd_client_add()
|
||||
MIME-Version: 1.0
|
||||
Content-Type: text/plain; charset=UTF-8
|
||||
Content-Transfer-Encoding: 8bit
|
||||
|
||||
RH-Author: Eric Blake <eblake@redhat.com>
|
||||
RH-MergeRequest: 388: nbd/server: fix CVE-2024-7409 (qemu crash on nbd-server-stop) [rhel-8.10.z]
|
||||
RH-Jira: RHEL-52611
|
||||
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
||||
RH-Acked-by: Richard W.M. Jones <rjones@redhat.com>
|
||||
RH-Commit: [1/4] 292be8dd2df2a840b2200e31a27e9d17fdab91ad (ebblake/qemu-kvm)
|
||||
|
||||
Upcoming patches to fix a CVE need to track an opaque pointer passed
|
||||
in by the owner of a client object, as well as request for a time
|
||||
limit on how fast negotiation must complete. Prepare for that by
|
||||
changing the signature of nbd_client_new() and adding an accessor to
|
||||
get at the opaque pointer, although for now the two servers
|
||||
(qemu-nbd.c and blockdev-nbd.c) do not change behavior even though
|
||||
they pass in a new default timeout value.
|
||||
|
||||
Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
|
||||
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||||
Message-ID: <20240807174943.771624-11-eblake@redhat.com>
|
||||
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
|
||||
[eblake: s/LIMIT/MAX_SECS/ as suggested by Dan]
|
||||
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||||
|
||||
(cherry picked from commit fb1c2aaa981e0a2fa6362c9985f1296b74f055ac)
|
||||
Jira: https://issues.redhat.com/browse/RHEL-52611
|
||||
Signed-off-by: Eric Blake <eblake@redhat.com>
|
||||
---
|
||||
blockdev-nbd.c | 6 ++++--
|
||||
include/block/nbd.h | 11 ++++++++++-
|
||||
nbd/server.c | 20 +++++++++++++++++---
|
||||
qemu-nbd.c | 4 +++-
|
||||
4 files changed, 34 insertions(+), 7 deletions(-)
|
||||
|
||||
diff --git a/blockdev-nbd.c b/blockdev-nbd.c
|
||||
index bdfa7ed3a5..b9e8dc78f3 100644
|
||||
--- a/blockdev-nbd.c
|
||||
+++ b/blockdev-nbd.c
|
||||
@@ -59,8 +59,10 @@ static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
|
||||
nbd_update_server_watch(nbd_server);
|
||||
|
||||
qio_channel_set_name(QIO_CHANNEL(cioc), "nbd-server");
|
||||
- nbd_client_new(cioc, nbd_server->tlscreds, nbd_server->tlsauthz,
|
||||
- nbd_blockdev_client_closed);
|
||||
+ /* TODO - expose handshake timeout as QMP option */
|
||||
+ nbd_client_new(cioc, NBD_DEFAULT_HANDSHAKE_MAX_SECS,
|
||||
+ nbd_server->tlscreds, nbd_server->tlsauthz,
|
||||
+ nbd_blockdev_client_closed, NULL);
|
||||
}
|
||||
|
||||
static void nbd_update_server_watch(NBDServerData *s)
|
||||
diff --git a/include/block/nbd.h b/include/block/nbd.h
|
||||
index 78d101b774..b71a297249 100644
|
||||
--- a/include/block/nbd.h
|
||||
+++ b/include/block/nbd.h
|
||||
@@ -27,6 +27,12 @@
|
||||
|
||||
extern const BlockExportDriver blk_exp_nbd;
|
||||
|
||||
+/*
|
||||
+ * NBD_DEFAULT_HANDSHAKE_MAX_SECS: Number of seconds in which client must
|
||||
+ * succeed at NBD_OPT_GO before being forcefully dropped as too slow.
|
||||
+ */
|
||||
+#define NBD_DEFAULT_HANDSHAKE_MAX_SECS 10
|
||||
+
|
||||
/* Handshake phase structs - this struct is passed on the wire */
|
||||
|
||||
struct NBDOption {
|
||||
@@ -338,9 +344,12 @@ AioContext *nbd_export_aio_context(NBDExport *exp);
|
||||
NBDExport *nbd_export_find(const char *name);
|
||||
|
||||
void nbd_client_new(QIOChannelSocket *sioc,
|
||||
+ uint32_t handshake_max_secs,
|
||||
QCryptoTLSCreds *tlscreds,
|
||||
const char *tlsauthz,
|
||||
- void (*close_fn)(NBDClient *, bool));
|
||||
+ void (*close_fn)(NBDClient *, bool),
|
||||
+ void *owner);
|
||||
+void *nbd_client_owner(NBDClient *client);
|
||||
void nbd_client_get(NBDClient *client);
|
||||
void nbd_client_put(NBDClient *client);
|
||||
|
||||
diff --git a/nbd/server.c b/nbd/server.c
|
||||
index 6db124cf53..cc1b6838bf 100644
|
||||
--- a/nbd/server.c
|
||||
+++ b/nbd/server.c
|
||||
@@ -120,10 +120,12 @@ typedef struct NBDExportMetaContexts {
|
||||
struct NBDClient {
|
||||
int refcount;
|
||||
void (*close_fn)(NBDClient *client, bool negotiated);
|
||||
+ void *owner;
|
||||
|
||||
NBDExport *exp;
|
||||
QCryptoTLSCreds *tlscreds;
|
||||
char *tlsauthz;
|
||||
+ uint32_t handshake_max_secs;
|
||||
QIOChannelSocket *sioc; /* The underlying data channel */
|
||||
QIOChannel *ioc; /* The current I/O channel which may differ (eg TLS) */
|
||||
|
||||
@@ -2706,6 +2708,7 @@ static coroutine_fn void nbd_co_client_start(void *opaque)
|
||||
|
||||
qemu_co_mutex_init(&client->send_lock);
|
||||
|
||||
+ /* TODO - utilize client->handshake_max_secs */
|
||||
if (nbd_negotiate(client, &local_err)) {
|
||||
if (local_err) {
|
||||
error_report_err(local_err);
|
||||
@@ -2718,14 +2721,17 @@ static coroutine_fn void nbd_co_client_start(void *opaque)
|
||||
}
|
||||
|
||||
/*
|
||||
- * Create a new client listener using the given channel @sioc.
|
||||
+ * Create a new client listener using the given channel @sioc and @owner.
|
||||
* Begin servicing it in a coroutine. When the connection closes, call
|
||||
- * @close_fn with an indication of whether the client completed negotiation.
|
||||
+ * @close_fn with an indication of whether the client completed negotiation
|
||||
+ * within @handshake_max_secs seconds (0 for unbounded).
|
||||
*/
|
||||
void nbd_client_new(QIOChannelSocket *sioc,
|
||||
+ uint32_t handshake_max_secs,
|
||||
QCryptoTLSCreds *tlscreds,
|
||||
const char *tlsauthz,
|
||||
- void (*close_fn)(NBDClient *, bool))
|
||||
+ void (*close_fn)(NBDClient *, bool),
|
||||
+ void *owner)
|
||||
{
|
||||
NBDClient *client;
|
||||
Coroutine *co;
|
||||
@@ -2737,13 +2743,21 @@ void nbd_client_new(QIOChannelSocket *sioc,
|
||||
object_ref(OBJECT(client->tlscreds));
|
||||
}
|
||||
client->tlsauthz = g_strdup(tlsauthz);
|
||||
+ client->handshake_max_secs = handshake_max_secs;
|
||||
client->sioc = sioc;
|
||||
qio_channel_set_delay(QIO_CHANNEL(sioc), false);
|
||||
object_ref(OBJECT(client->sioc));
|
||||
client->ioc = QIO_CHANNEL(sioc);
|
||||
object_ref(OBJECT(client->ioc));
|
||||
client->close_fn = close_fn;
|
||||
+ client->owner = owner;
|
||||
|
||||
co = qemu_coroutine_create(nbd_co_client_start, client);
|
||||
qemu_coroutine_enter(co);
|
||||
}
|
||||
+
|
||||
+void *
|
||||
+nbd_client_owner(NBDClient *client)
|
||||
+{
|
||||
+ return client->owner;
|
||||
+}
|
||||
diff --git a/qemu-nbd.c b/qemu-nbd.c
|
||||
index c6c20df68a..f48abf379e 100644
|
||||
--- a/qemu-nbd.c
|
||||
+++ b/qemu-nbd.c
|
||||
@@ -363,7 +363,9 @@ static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
|
||||
|
||||
nb_fds++;
|
||||
nbd_update_server_watch();
|
||||
- nbd_client_new(cioc, tlscreds, tlsauthz, nbd_client_closed);
|
||||
+ /* TODO - expose handshake timeout as command line option */
|
||||
+ nbd_client_new(cioc, NBD_DEFAULT_HANDSHAKE_MAX_SECS,
|
||||
+ tlscreds, tlsauthz, nbd_client_closed, NULL);
|
||||
}
|
||||
|
||||
static void nbd_update_server_watch(void)
|
||||
--
|
||||
2.39.3
|
||||
|
||||
@ -0,0 +1,92 @@
|
||||
From 7ad4fc282b1f96d619ce2f9f7ed9049c3b894dd4 Mon Sep 17 00:00:00 2001
|
||||
From: Jon Maloy <jmaloy@redhat.com>
|
||||
Date: Thu, 18 Jul 2024 09:42:42 -0400
|
||||
Subject: [PATCH 1/6] virtio-gpu: free BHs, by implementing unrealize
|
||||
MIME-Version: 1.0
|
||||
Content-Type: text/plain; charset=UTF-8
|
||||
Content-Transfer-Encoding: 8bit
|
||||
|
||||
RH-Author: Jon Maloy <jmaloy@redhat.com>
|
||||
RH-MergeRequest: 380: QEMU: virtio: DMA reentrancy issue leads to double free vulnerability
|
||||
RH-Jira: RHEL-32276
|
||||
RH-Acked-by: Gerd Hoffmann <None>
|
||||
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
||||
RH-Commit: [1/6] d05c10426afac428d775669748f0aa689c23e787 (redhat/rhel/src/qemu-kvm/jons-qemu-kvm-2)
|
||||
|
||||
JIRA: https://issues.redhat.com/browse/RHEL-32276
|
||||
CVE: CVE-2024-3446
|
||||
Upstream: Merged
|
||||
|
||||
commit 957d77863e4564454eb97f8f371096843daf4678
|
||||
Author: Marc-André Lureau <marcandre.lureau@redhat.com>
|
||||
Date: Wed Jul 26 21:39:28 2023 +0400
|
||||
|
||||
virtio-gpu: free BHs, by implementing unrealize
|
||||
|
||||
Acked-by: Dongwon Kim <dongwon.kim@intel.com>
|
||||
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
|
||||
Message-Id: <20230726173929.690601-2-marcandre.lureau@redhat.com>
|
||||
|
||||
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
|
||||
---
|
||||
hw/display/virtio-gpu-base.c | 2 +-
|
||||
hw/display/virtio-gpu.c | 10 ++++++++++
|
||||
include/hw/virtio/virtio-gpu.h | 1 +
|
||||
3 files changed, 12 insertions(+), 1 deletion(-)
|
||||
|
||||
diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c
|
||||
index c8da4806e0..e3ff9dcf38 100644
|
||||
--- a/hw/display/virtio-gpu-base.c
|
||||
+++ b/hw/display/virtio-gpu-base.c
|
||||
@@ -223,7 +223,7 @@ virtio_gpu_base_set_features(VirtIODevice *vdev, uint64_t features)
|
||||
trace_virtio_gpu_features(((features & virgl) == virgl));
|
||||
}
|
||||
|
||||
-static void
|
||||
+void
|
||||
virtio_gpu_base_device_unrealize(DeviceState *qdev)
|
||||
{
|
||||
VirtIOGPUBase *g = VIRTIO_GPU_BASE(qdev);
|
||||
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
|
||||
index ecf9079145..e230e5091f 100644
|
||||
--- a/hw/display/virtio-gpu.c
|
||||
+++ b/hw/display/virtio-gpu.c
|
||||
@@ -1341,6 +1341,15 @@ void virtio_gpu_device_realize(DeviceState *qdev, Error **errp)
|
||||
QTAILQ_INIT(&g->fenceq);
|
||||
}
|
||||
|
||||
+static void virtio_gpu_device_unrealize(DeviceState *qdev)
|
||||
+{
|
||||
+ VirtIOGPU *g = VIRTIO_GPU(qdev);
|
||||
+
|
||||
+ g_clear_pointer(&g->ctrl_bh, qemu_bh_delete);
|
||||
+ g_clear_pointer(&g->cursor_bh, qemu_bh_delete);
|
||||
+ virtio_gpu_base_device_unrealize(qdev);
|
||||
+}
|
||||
+
|
||||
void virtio_gpu_reset(VirtIODevice *vdev)
|
||||
{
|
||||
VirtIOGPU *g = VIRTIO_GPU(vdev);
|
||||
@@ -1436,6 +1445,7 @@ static void virtio_gpu_class_init(ObjectClass *klass, void *data)
|
||||
vgbc->gl_flushed = virtio_gpu_handle_gl_flushed;
|
||||
|
||||
vdc->realize = virtio_gpu_device_realize;
|
||||
+ vdc->unrealize = virtio_gpu_device_unrealize;
|
||||
vdc->reset = virtio_gpu_reset;
|
||||
vdc->get_config = virtio_gpu_get_config;
|
||||
vdc->set_config = virtio_gpu_set_config;
|
||||
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
|
||||
index acfba7c76c..4367d005f1 100644
|
||||
--- a/include/hw/virtio/virtio-gpu.h
|
||||
+++ b/include/hw/virtio/virtio-gpu.h
|
||||
@@ -235,6 +235,7 @@ bool virtio_gpu_base_device_realize(DeviceState *qdev,
|
||||
VirtIOHandleOutput ctrl_cb,
|
||||
VirtIOHandleOutput cursor_cb,
|
||||
Error **errp);
|
||||
+void virtio_gpu_base_device_unrealize(DeviceState *qdev);
|
||||
void virtio_gpu_base_reset(VirtIOGPUBase *g);
|
||||
void virtio_gpu_base_fill_display_info(VirtIOGPUBase *g,
|
||||
struct virtio_gpu_resp_display_info *dpy_info);
|
||||
--
|
||||
2.39.3
|
||||
|
||||
@ -0,0 +1,143 @@
|
||||
From 29328e9693aeae1c980a859d4966deda9f54242d Mon Sep 17 00:00:00 2001
|
||||
From: Jon Maloy <jmaloy@redhat.com>
|
||||
Date: Thu, 18 Jul 2024 09:36:06 -0400
|
||||
Subject: [PATCH 2/6] virtio-gpu: reset gfx resources in main thread
|
||||
MIME-Version: 1.0
|
||||
Content-Type: text/plain; charset=UTF-8
|
||||
Content-Transfer-Encoding: 8bit
|
||||
|
||||
RH-Author: Jon Maloy <jmaloy@redhat.com>
|
||||
RH-MergeRequest: 380: QEMU: virtio: DMA reentrancy issue leads to double free vulnerability
|
||||
RH-Jira: RHEL-32276
|
||||
RH-Acked-by: Gerd Hoffmann <None>
|
||||
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
||||
RH-Commit: [2/6] a97eef1e6e85b44c08d17adcdc468e857e48a17e (redhat/rhel/src/qemu-kvm/jons-qemu-kvm-2)
|
||||
|
||||
JIRA: https://issues.redhat.com/browse/RHEL-32276
|
||||
CVE: CVE-2024-3446
|
||||
Upstream: Merged
|
||||
|
||||
commit a41e2d97f92b48552988b3cc62dce79d62f60dcc
|
||||
Author: Marc-André Lureau <marcandre.lureau@redhat.com>
|
||||
Date: Wed Jul 26 21:39:29 2023 +0400
|
||||
|
||||
virtio-gpu: reset gfx resources in main thread
|
||||
|
||||
Calling OpenGL from different threads can have bad consequences if not
|
||||
carefully reviewed. It's not generally supported. In my case, I was
|
||||
debugging a crash in glDeleteTextures from OPENGL32.DLL, where I asked
|
||||
qemu for gl=es, and thus ANGLE implementation was expected. libepoxy did
|
||||
resolution of the global pointer for glGenTexture to the GLES version
|
||||
from the main thread. But it resolved glDeleteTextures to the GL
|
||||
version, because it was done from a different thread without correct
|
||||
context. Oops.
|
||||
|
||||
Let's stick to the main thread for GL calls by using a BH.
|
||||
|
||||
Note: I didn't use atomics for reset_finished check, assuming the BQL
|
||||
will provide enough of sync, but I might be wrong.
|
||||
|
||||
Acked-by: Dongwon Kim <dongwon.kim@intel.com>
|
||||
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
|
||||
Message-Id: <20230726173929.690601-3-marcandre.lureau@redhat.com>
|
||||
|
||||
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
|
||||
---
|
||||
hw/display/virtio-gpu.c | 35 +++++++++++++++++++++++++++++++---
|
||||
include/hw/virtio/virtio-gpu.h | 3 +++
|
||||
2 files changed, 35 insertions(+), 3 deletions(-)
|
||||
|
||||
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
|
||||
index e230e5091f..c28ce1ea72 100644
|
||||
--- a/hw/display/virtio-gpu.c
|
||||
+++ b/hw/display/virtio-gpu.c
|
||||
@@ -14,6 +14,7 @@
|
||||
#include "qemu/osdep.h"
|
||||
#include "qemu/units.h"
|
||||
#include "qemu/iov.h"
|
||||
+#include "sysemu/cpus.h"
|
||||
#include "ui/console.h"
|
||||
#include "trace.h"
|
||||
#include "sysemu/dma.h"
|
||||
@@ -42,6 +43,7 @@ virtio_gpu_find_check_resource(VirtIOGPU *g, uint32_t resource_id,
|
||||
|
||||
static void virtio_gpu_cleanup_mapping(VirtIOGPU *g,
|
||||
struct virtio_gpu_simple_resource *res);
|
||||
+static void virtio_gpu_reset_bh(void *opaque);
|
||||
|
||||
void virtio_gpu_update_cursor_data(VirtIOGPU *g,
|
||||
struct virtio_gpu_scanout *s,
|
||||
@@ -1336,6 +1338,8 @@ void virtio_gpu_device_realize(DeviceState *qdev, Error **errp)
|
||||
&qdev->mem_reentrancy_guard);
|
||||
g->cursor_bh = qemu_bh_new_guarded(virtio_gpu_cursor_bh, g,
|
||||
&qdev->mem_reentrancy_guard);
|
||||
+ g->reset_bh = qemu_bh_new(virtio_gpu_reset_bh, g);
|
||||
+ qemu_cond_init(&g->reset_cond);
|
||||
QTAILQ_INIT(&g->reslist);
|
||||
QTAILQ_INIT(&g->cmdq);
|
||||
QTAILQ_INIT(&g->fenceq);
|
||||
@@ -1347,19 +1351,44 @@ static void virtio_gpu_device_unrealize(DeviceState *qdev)
|
||||
|
||||
g_clear_pointer(&g->ctrl_bh, qemu_bh_delete);
|
||||
g_clear_pointer(&g->cursor_bh, qemu_bh_delete);
|
||||
+ g_clear_pointer(&g->reset_bh, qemu_bh_delete);
|
||||
+ qemu_cond_destroy(&g->reset_cond);
|
||||
virtio_gpu_base_device_unrealize(qdev);
|
||||
}
|
||||
|
||||
-void virtio_gpu_reset(VirtIODevice *vdev)
|
||||
+static void virtio_gpu_reset_bh(void *opaque)
|
||||
{
|
||||
- VirtIOGPU *g = VIRTIO_GPU(vdev);
|
||||
+ VirtIOGPU *g = VIRTIO_GPU(opaque);
|
||||
struct virtio_gpu_simple_resource *res, *tmp;
|
||||
- struct virtio_gpu_ctrl_command *cmd;
|
||||
+ int i = 0;
|
||||
|
||||
QTAILQ_FOREACH_SAFE(res, &g->reslist, next, tmp) {
|
||||
virtio_gpu_resource_destroy(g, res);
|
||||
}
|
||||
|
||||
+ for (i = 0; i < g->parent_obj.conf.max_outputs; i++) {
|
||||
+ dpy_gfx_replace_surface(g->parent_obj.scanout[i].con, NULL);
|
||||
+ }
|
||||
+
|
||||
+ g->reset_finished = true;
|
||||
+ qemu_cond_signal(&g->reset_cond);
|
||||
+}
|
||||
+
|
||||
+void virtio_gpu_reset(VirtIODevice *vdev)
|
||||
+{
|
||||
+ VirtIOGPU *g = VIRTIO_GPU(vdev);
|
||||
+ struct virtio_gpu_ctrl_command *cmd;
|
||||
+
|
||||
+ if (qemu_in_vcpu_thread()) {
|
||||
+ g->reset_finished = false;
|
||||
+ qemu_bh_schedule(g->reset_bh);
|
||||
+ while (!g->reset_finished) {
|
||||
+ qemu_cond_wait_iothread(&g->reset_cond);
|
||||
+ }
|
||||
+ } else {
|
||||
+ virtio_gpu_reset_bh(g);
|
||||
+ }
|
||||
+
|
||||
while (!QTAILQ_EMPTY(&g->cmdq)) {
|
||||
cmd = QTAILQ_FIRST(&g->cmdq);
|
||||
QTAILQ_REMOVE(&g->cmdq, cmd, next);
|
||||
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
|
||||
index 4367d005f1..f3578c1325 100644
|
||||
--- a/include/hw/virtio/virtio-gpu.h
|
||||
+++ b/include/hw/virtio/virtio-gpu.h
|
||||
@@ -166,6 +166,9 @@ struct VirtIOGPU {
|
||||
|
||||
QEMUBH *ctrl_bh;
|
||||
QEMUBH *cursor_bh;
|
||||
+ QEMUBH *reset_bh;
|
||||
+ QemuCond reset_cond;
|
||||
+ bool reset_finished;
|
||||
|
||||
QTAILQ_HEAD(, virtio_gpu_simple_resource) reslist;
|
||||
QTAILQ_HEAD(, virtio_gpu_ctrl_command) cmdq;
|
||||
--
|
||||
2.39.3
|
||||
|
||||
@ -0,0 +1,49 @@
|
||||
From a38e51982522910475ec051f81116639254a2955 Mon Sep 17 00:00:00 2001
|
||||
From: Gerd Hoffmann <kraxel@redhat.com>
|
||||
Date: Thu, 30 May 2024 13:10:29 +0200
|
||||
Subject: [PATCH 5/5] vnc: increase max display size
|
||||
MIME-Version: 1.0
|
||||
Content-Type: text/plain; charset=UTF-8
|
||||
Content-Transfer-Encoding: 8bit
|
||||
|
||||
RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
|
||||
RH-MergeRequest: 391: vnc: increase max display size
|
||||
RH-Jira: RHEL-50854
|
||||
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
||||
RH-Commit: [1/1] 8d79bbc6949ca7264f6701121b47e946eb8ac824
|
||||
|
||||
Resolves:
|
||||
https://issues.redhat.com/browse/RHEL-50854
|
||||
|
||||
It's 2024. 4k display resolutions are a thing these days.
|
||||
Raise width and height limits of the qemu vnc server.
|
||||
|
||||
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1596
|
||||
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
|
||||
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
|
||||
Message-ID: <20240530111029.1726329-1-kraxel@redhat.com>
|
||||
|
||||
(cherry picked from commit 1f1736a8f16d27a99abd371caaeedc10e6411d15)
|
||||
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
|
||||
---
|
||||
ui/vnc.h | 4 ++--
|
||||
1 file changed, 2 insertions(+), 2 deletions(-)
|
||||
|
||||
diff --git a/ui/vnc.h b/ui/vnc.h
|
||||
index a7149831f9..4d44957cc2 100644
|
||||
--- a/ui/vnc.h
|
||||
+++ b/ui/vnc.h
|
||||
@@ -81,8 +81,8 @@ typedef void VncSendHextileTile(VncState *vs,
|
||||
|
||||
/* VNC_MAX_WIDTH must be a multiple of VNC_DIRTY_PIXELS_PER_BIT. */
|
||||
|
||||
-#define VNC_MAX_WIDTH ROUND_UP(2560, VNC_DIRTY_PIXELS_PER_BIT)
|
||||
-#define VNC_MAX_HEIGHT 2048
|
||||
+#define VNC_MAX_WIDTH ROUND_UP(5120, VNC_DIRTY_PIXELS_PER_BIT)
|
||||
+#define VNC_MAX_HEIGHT 2160
|
||||
|
||||
/* VNC_DIRTY_BITS is the number of bits in the dirty bitmap. */
|
||||
#define VNC_DIRTY_BITS (VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT)
|
||||
--
|
||||
2.39.3
|
||||
|
||||
Loading…
Reference in new issue