The tulip networking card emulation has an OOB issue in 'tulip_copy_tx_buffers' when the guest provide malformed descriptor. This test will trigger a ASAN heap overflow crash. To trigger this issue we can construct the data as following: 1. construct a 'tulip_descriptor'. Its control is set to '0x7ff | 0x7ff << 11', this will make the 'tulip_copy_tx_buffers's 'len1' and 'len2' to 0x7ff(2047). So 'len1+len2' will overflow 'TULIPState's 'tx_frame' field. This descriptor's 'buf_addr1' and 'buf_addr2' should set to a guest address. 2. write this descriptor to tulip device's CSR4 register. This will set the 'TULIPState's 'current_tx_desc' field. 3. write 'CSR6_ST' to tulip device's CSR6 register. This will trigger 'tulip_xmit_list_update' and finally calls 'tulip_copy_tx_buffers'. Following shows the backtrack of crash: ==31781==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x628000007cd0 at pc 0x7fe03c5a077a bp 0x7fff05b46770 sp 0x7fff05b45f18 WRITE of size 2047 at 0x628000007cd0 thread T0 #0 0x7fe03c5a0779 (/usr/lib/x86_64-linux-gnu/libasan.so.4+0x79779) #1 0x5575fb6daa6a in flatview_read_continue /home/test/qemu/exec.c:3194 #2 0x5575fb6daccb in flatview_read /home/test/qemu/exec.c:3227 #3 0x5575fb6dae66 in address_space_read_full /home/test/qemu/exec.c:3240 #4 0x5575fb6db0cb in address_space_rw /home/test/qemu/exec.c:3268 #5 0x5575fbdfd460 in dma_memory_rw_relaxed /home/test/qemu/include/sysemu/dma.h:87 #6 0x5575fbdfd4b5 in dma_memory_rw /home/test/qemu/include/sysemu/dma.h:110 #7 0x5575fbdfd866 in pci_dma_rw /home/test/qemu/include/hw/pci/pci.h:787 #8 0x5575fbdfd8a3 in pci_dma_read /home/test/qemu/include/hw/pci/pci.h:794 #9 0x5575fbe02761 in tulip_copy_tx_buffers hw/net/tulip.c:585 #10 0x5575fbe0366b in tulip_xmit_list_update hw/net/tulip.c:678 #11 0x5575fbe04073 in tulip_write hw/net/tulip.c:783 Signed-off-by: Li Qiang <liq3ea@163.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/*
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* QTest testcase for DEC/Intel Tulip 21143
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*
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* Copyright (c) 2020 Li Qiang <liq3ea@gmail.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "libqtest.h"
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#include "qemu/module.h"
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#include "libqos/qgraph.h"
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#include "libqos/pci.h"
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#include "qemu/bitops.h"
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#include "hw/net/tulip.h"
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typedef struct QTulip_pci QTulip_pci;
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struct QTulip_pci {
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QOSGraphObject obj;
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QPCIDevice dev;
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};
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static void *tulip_pci_get_driver(void *obj, const char *interface)
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{
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QTulip_pci *tulip_pci = obj;
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if (!g_strcmp0(interface, "pci-device")) {
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return &tulip_pci->dev;
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}
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fprintf(stderr, "%s not present in tulip_pci\n", interface);
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g_assert_not_reached();
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}
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static void *tulip_pci_create(void *pci_bus, QGuestAllocator *alloc, void *addr)
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{
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QTulip_pci *tulip_pci = g_new0(QTulip_pci, 1);
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QPCIBus *bus = pci_bus;
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qpci_device_init(&tulip_pci->dev, bus, addr);
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tulip_pci->obj.get_driver = tulip_pci_get_driver;
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return &tulip_pci->obj;
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}
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static void tulip_large_tx(void *obj, void *data, QGuestAllocator *alloc)
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{
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QTulip_pci *tulip_pci = obj;
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QPCIDevice *dev = &tulip_pci->dev;
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QPCIBar bar;
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struct tulip_descriptor context;
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char guest_data[4096];
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uint64_t context_pa;
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uint64_t guest_pa;
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qpci_device_enable(dev);
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bar = qpci_iomap(dev, 0, NULL);
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context_pa = guest_alloc(alloc, sizeof(context));
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guest_pa = guest_alloc(alloc, 4096);
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memset(guest_data, 'A', sizeof(guest_data));
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context.status = TDES0_OWN;
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context.control = TDES1_BUF2_SIZE_MASK << TDES1_BUF2_SIZE_SHIFT |
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TDES1_BUF1_SIZE_MASK << TDES1_BUF1_SIZE_SHIFT;
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context.buf_addr2 = guest_pa;
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context.buf_addr1 = guest_pa;
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qtest_memwrite(dev->bus->qts, context_pa, &context, sizeof(context));
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qtest_memwrite(dev->bus->qts, guest_pa, guest_data, sizeof(guest_data));
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qpci_io_writel(dev, bar, 0x20, context_pa);
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qpci_io_writel(dev, bar, 0x30, CSR6_ST);
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guest_free(alloc, context_pa);
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guest_free(alloc, guest_pa);
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}
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static void tulip_register_nodes(void)
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{
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QOSGraphEdgeOptions opts = {
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.extra_device_opts = "addr=04.0",
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};
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add_qpci_address(&opts, &(QPCIAddress) { .devfn = QPCI_DEVFN(4, 0) });
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qos_node_create_driver("tulip", tulip_pci_create);
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qos_node_consumes("tulip", "pci-bus", &opts);
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qos_node_produces("tulip", "pci-device");
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qos_add_test("tulip_large_tx", "tulip", tulip_large_tx, NULL);
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}
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libqos_init(tulip_register_nodes);
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