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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1721366751; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=ra4H6wLzv12klExwbZkqnB68XPuqx6+NSUlYaJKx+UE=; b=R3I713N6ENQdpZonCXGR8xpnQQa+DbmD0jfzXJ0PcOjqnDEHsrmMcxSNp273YHfPE33hgw fYkuITZnJGMhwc0WwD0g0JxGZTyEnLH5UWW+uNEuyhvULc3tfByyKa1TVXvb712X+vX/lI PLKunufWx0cxvsR1g0gXSh7NKaGZMRM= X-MC-Unique: As3jk8oaPbu66Cib9FSUig-1 From: Cindy Lu To: lulu@redhat.com, mst@redhat.com, jasowang@redhat.com, qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org Subject: [PATCH v5] virtio-pci: Fix the use of an uninitialized irqfd Date: Fri, 19 Jul 2024 13:25:31 +0800 Message-ID: <20240719052531.926801-1-lulu@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=lulu@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1721366827774116600 Content-Type: text/plain; charset="utf-8" The crash was reported in MAC OS and NixOS, here is the link for this bug https://gitlab.com/qemu-project/qemu/-/issues/2334 https://gitlab.com/qemu-project/qemu/-/issues/2321 In this bug, they are using the virtio_input device. The guest notifier was not supported for this device, The function virtio_pci_set_guest_notifiers() was not called, and the vector_irqfd was not initialized. So the fix is adding the check for vector_irqfd in virtio_pci_get_notifier() But The function virtio_pci_get_notifier(),it can also be used in all kinds= of device. If the vector_irqfd still didn't initial after the VIRTIO_CONFIG_S_DRIVER_O= K is set means this device is not using guest notifier. We can let the check fail he= re This fix is verified in vyatta,MacOS,NixOS,fedora system. The bt tree for this bug is: Thread 6 "CPU 0/KVM" received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7c817be006c0 (LWP 1269146)] kvm_virtio_pci_vq_vector_use () at ../qemu-9.0.0/hw/virtio/virtio-pci.c:817 817 if (irqfd->users =3D=3D 0) { (gdb) thread apply all bt ... Thread 6 (Thread 0x7c817be006c0 (LWP 1269146) "CPU 0/KVM"): 0 kvm_virtio_pci_vq_vector_use () at ../qemu-9.0.0/hw/virtio/virtio-pci.c:= 817 1 kvm_virtio_pci_vector_use_one () at ../qemu-9.0.0/hw/virtio/virtio-pci.c= :893 2 0x00005983657045e2 in memory_region_write_accessor () at ../qemu-9.0.0/s= ystem/memory.c:497 3 0x0000598365704ba6 in access_with_adjusted_size () at ../qemu-9.0.0/syst= em/memory.c:573 4 0x0000598365705059 in memory_region_dispatch_write () at ../qemu-9.0.0/s= ystem/memory.c:1528 5 0x00005983659b8e1f in flatview_write_continue_step.isra.0 () at ../qemu-= 9.0.0/system/physmem.c:2713 6 0x000059836570ba7d in flatview_write_continue () at ../qemu-9.0.0/system= /physmem.c:2743 7 flatview_write () at ../qemu-9.0.0/system/physmem.c:2774 8 0x000059836570bb76 in address_space_write () at ../qemu-9.0.0/system/phy= smem.c:2894 9 0x0000598365763afe in address_space_rw () at ../qemu-9.0.0/system/physme= m.c:2904 10 kvm_cpu_exec () at ../qemu-9.0.0/accel/kvm/kvm-all.c:2917 11 0x000059836576656e in kvm_vcpu_thread_fn () at ../qemu-9.0.0/accel/kvm/k= vm-accel-ops.c:50 12 0x0000598365926ca8 in qemu_thread_start () at ../qemu-9.0.0/util/qemu-th= read-posix.c:541 13 0x00007c8185bcd1cf in ??? () at /usr/lib/libc.so.6 14 0x00007c8185c4e504 in clone () at /usr/lib/libc.so.6 Fixes: 2ce6cff94d ("virtio-pci: fix use of a released vector") Cc: qemu-stable@nongnu.org Signed-off-by: Cindy Lu --- hw/virtio/virtio-pci.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 592fdaa10f..dc31a37ec0 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -860,6 +860,9 @@ static int virtio_pci_get_notifier(VirtIOPCIProxy *prox= y, int queue_no, VirtIODevice *vdev =3D virtio_bus_get_device(&proxy->bus); VirtQueue *vq; =20 + if (!proxy->vector_irqfd && vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) + return -1; + if (queue_no =3D=3D VIRTIO_CONFIG_IRQ_IDX) { *n =3D virtio_config_get_guest_notifier(vdev); *vector =3D vdev->config_vector; --=20 2.45.0