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144 lines
5.1 KiB
144 lines
5.1 KiB
From 29328e9693aeae1c980a859d4966deda9f54242d 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 09:36:06 -0400
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Subject: [PATCH 2/6] virtio-gpu: reset gfx resources in main thread
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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: [2/6] a97eef1e6e85b44c08d17adcdc468e857e48a17e (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 a41e2d97f92b48552988b3cc62dce79d62f60dcc
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Author: Marc-André Lureau <marcandre.lureau@redhat.com>
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Date: Wed Jul 26 21:39:29 2023 +0400
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virtio-gpu: reset gfx resources in main thread
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Calling OpenGL from different threads can have bad consequences if not
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carefully reviewed. It's not generally supported. In my case, I was
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debugging a crash in glDeleteTextures from OPENGL32.DLL, where I asked
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qemu for gl=es, and thus ANGLE implementation was expected. libepoxy did
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resolution of the global pointer for glGenTexture to the GLES version
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from the main thread. But it resolved glDeleteTextures to the GL
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version, because it was done from a different thread without correct
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context. Oops.
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Let's stick to the main thread for GL calls by using a BH.
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Note: I didn't use atomics for reset_finished check, assuming the BQL
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will provide enough of sync, but I might be wrong.
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Acked-by: Dongwon Kim <dongwon.kim@intel.com>
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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-Id: <20230726173929.690601-3-marcandre.lureau@redhat.com>
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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 | 35 +++++++++++++++++++++++++++++++---
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include/hw/virtio/virtio-gpu.h | 3 +++
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2 files changed, 35 insertions(+), 3 deletions(-)
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diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
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index e230e5091f..c28ce1ea72 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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@@ -14,6 +14,7 @@
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#include "qemu/osdep.h"
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#include "qemu/units.h"
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#include "qemu/iov.h"
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+#include "sysemu/cpus.h"
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#include "ui/console.h"
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#include "trace.h"
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#include "sysemu/dma.h"
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@@ -42,6 +43,7 @@ virtio_gpu_find_check_resource(VirtIOGPU *g, uint32_t resource_id,
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static void virtio_gpu_cleanup_mapping(VirtIOGPU *g,
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struct virtio_gpu_simple_resource *res);
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+static void virtio_gpu_reset_bh(void *opaque);
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void virtio_gpu_update_cursor_data(VirtIOGPU *g,
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struct virtio_gpu_scanout *s,
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@@ -1336,6 +1338,8 @@ void virtio_gpu_device_realize(DeviceState *qdev, Error **errp)
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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->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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QTAILQ_INIT(&g->cmdq);
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QTAILQ_INIT(&g->fenceq);
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@@ -1347,19 +1351,44 @@ static void virtio_gpu_device_unrealize(DeviceState *qdev)
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g_clear_pointer(&g->ctrl_bh, qemu_bh_delete);
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g_clear_pointer(&g->cursor_bh, qemu_bh_delete);
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+ g_clear_pointer(&g->reset_bh, qemu_bh_delete);
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+ qemu_cond_destroy(&g->reset_cond);
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virtio_gpu_base_device_unrealize(qdev);
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}
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-void virtio_gpu_reset(VirtIODevice *vdev)
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+static void virtio_gpu_reset_bh(void *opaque)
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{
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- VirtIOGPU *g = VIRTIO_GPU(vdev);
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+ VirtIOGPU *g = VIRTIO_GPU(opaque);
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struct virtio_gpu_simple_resource *res, *tmp;
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- struct virtio_gpu_ctrl_command *cmd;
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+ int i = 0;
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QTAILQ_FOREACH_SAFE(res, &g->reslist, next, tmp) {
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virtio_gpu_resource_destroy(g, res);
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}
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+ for (i = 0; i < g->parent_obj.conf.max_outputs; i++) {
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+ dpy_gfx_replace_surface(g->parent_obj.scanout[i].con, NULL);
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+ }
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+
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+ g->reset_finished = true;
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+ qemu_cond_signal(&g->reset_cond);
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+}
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+
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+void virtio_gpu_reset(VirtIODevice *vdev)
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+{
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+ VirtIOGPU *g = VIRTIO_GPU(vdev);
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+ struct virtio_gpu_ctrl_command *cmd;
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+
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+ if (qemu_in_vcpu_thread()) {
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+ g->reset_finished = false;
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+ qemu_bh_schedule(g->reset_bh);
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+ while (!g->reset_finished) {
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+ qemu_cond_wait_iothread(&g->reset_cond);
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+ }
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+ } else {
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+ virtio_gpu_reset_bh(g);
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+ }
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+
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while (!QTAILQ_EMPTY(&g->cmdq)) {
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cmd = QTAILQ_FIRST(&g->cmdq);
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QTAILQ_REMOVE(&g->cmdq, cmd, next);
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diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
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index 4367d005f1..f3578c1325 100644
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--- a/include/hw/virtio/virtio-gpu.h
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+++ b/include/hw/virtio/virtio-gpu.h
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@@ -166,6 +166,9 @@ struct VirtIOGPU {
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QEMUBH *ctrl_bh;
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QEMUBH *cursor_bh;
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+ QEMUBH *reset_bh;
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+ QemuCond reset_cond;
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+ bool reset_finished;
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QTAILQ_HEAD(, virtio_gpu_simple_resource) reslist;
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QTAILQ_HEAD(, virtio_gpu_ctrl_command) cmdq;
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--
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2.39.3
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