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Heap use-after-free in lduw_he_p through e1000e_write_to_rx_buffers
Hello,
This reproducer causes a heap-use-after free. QEMU Built with --enable-sanitizers:
cat << EOF | ./i386-softmmu/qemu-system-i386 -M q35,accel=qtest \
-qtest stdio -nographic -monitor none -serial none
outl 0xcf8 0x80001010
outl 0xcfc 0xe1020000
outl 0xcf8 0x80001014
outl 0xcf8 0x80001004
outw 0xcfc 0x7
outl 0xcf8 0x800010a2
write 0xe102003b 0x1 0xff
write 0xe1020103 0x1e 0xffffff055c5e5c30be4511d084ffffffffffffffffffffffffffffffffff
write 0xe1020420 0x4 0xffffffff
write 0xe1020424 0x4 0xffffffff
write 0xe102042b 0x1 0xff
write 0xe1020430 0x4 0x055c5e5c
write 0x5c041 0x1 0x04
write 0x5c042 0x1 0x02
write 0x5c043 0x1 0xe1
write 0x5c048 0x1 0x8a
write 0x5c04a 0x1 0x31
write 0x5c04b 0x1 0xff
write 0xe1020403 0x1 0xff
EOF
The Output:
==22689==ERROR: AddressSanitizer: heap-use-after-free on address 0x62500026800e at pc 0x55b93bb18bfa bp 0x7fffdbe844f0 sp 0x7fffdbe83cb8
READ of size 2 at 0x62500026800e thread T0
#0 in __asan_memcpy (/build/i386-softmmu/qemu-system-i386+)
#1 in lduw_he_p /include/qemu/bswap.h:332:5
#2 in ldn_he_p /include/qemu/bswap.h:550:1
#3 in flatview_write_continue /exec.c:3145:19
#4 in flatview_write /exec.c:3186:14
#5 in address_space_write /exec.c:3280:18
#6 in address_space_rw /exec.c:3290:16
#7 in dma_memory_rw_relaxed /include/sysemu/dma.h:87:18
#8 in dma_memory_rw /include/sysemu/dma.h:113:12
#9 in pci_dma_rw /include/hw/pci/pci.h:789:5
#10 in pci_dma_write /include/hw/pci/pci.h:802:12
#11 in e1000e_write_to_rx_buffers /hw/net/e1000e_core.c:1412:9
#12 in e1000e_write_packet_to_guest /hw/net/e1000e_core.c:1582:21
#13 in e1000e_receive_iov /hw/net/e1000e_core.c:1709:9
#14 in e1000e_nc_receive_iov /hw/net/e1000e.c:213:12
#15 in net_tx_pkt_sendv /hw/net/net_tx_pkt.c:544:9
#16 in net_tx_pkt_send /hw/net/net_tx_pkt.c:620:9
#17 in net_tx_pkt_send_loopback /hw/net/net_tx_pkt.c:633:11
#18 in e1000e_tx_pkt_send /hw/net/e1000e_core.c:664:16
#19 in e1000e_process_tx_desc /hw/net/e1000e_core.c:743:17
#20 in e1000e_start_xmit /hw/net/e1000e_core.c:934:9
#21 in e1000e_set_tctl /hw/net/e1000e_core.c:2431:9
#22 in e1000e_core_write /hw/net/e1000e_core.c:3265:9
#23 in e1000e_mmio_write /hw/net/e1000e.c:109:5
#24 in memory_region_write_accessor /memory.c:483:5
#25 in access_with_adjusted_size /memory.c:544:18
#26 in memory_region_dispatch_write /memory.c:1476:16
#27 in flatview_write_continue /exec.c:3146:23
#28 in flatview_write /exec.c:3186:14
#29 in address_space_write /exec.c:3280:18
#30 in qtest_process_command /qtest.c:567:9
#31 in qtest_process_inbuf /qtest.c:710:9
#32 in qtest_read /qtest.c:722:5
#33 in qemu_chr_be_write_impl /chardev/char.c:188:9
#34 in qemu_chr_be_write /chardev/char.c:200:9
#35 in fd_chr_read /chardev/char-fd.c:68:9
#36 in qio_channel_fd_source_dispatch /io/channel-watch.c:84:12
#37 in g_main_context_dispatch (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+)
#38 in glib_pollfds_poll /util/main-loop.c:219:9
#39 in os_host_main_loop_wait /util/main-loop.c:242:5
#40 in main_loop_wait /util/main-loop.c:518:11
#41 in qemu_main_loop /softmmu/vl.c:1664:9
#42 in main /softmmu/main.c:52:5
#43 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+)
#44 in _start (/build/i386-softmmu/qemu-system-i386+)
0x62500026800e is located 14 bytes inside of 138-byte region [0x625000268000,0x62500026808a)
freed by thread T0 here:
#0 in free (/build/i386-softmmu/qemu-system-i386+)
#1 in qemu_vfree /util/oslib-posix.c:238:5
#2 in address_space_unmap /exec.c:3616:5
#3 in dma_memory_unmap /include/sysemu/dma.h:148:5
#4 in pci_dma_unmap /include/hw/pci/pci.h:839:5
#5 in net_tx_pkt_reset /hw/net/net_tx_pkt.c:453:9
#6 in e1000e_process_tx_desc /hw/net/e1000e_core.c:749:9
#7 in e1000e_start_xmit /hw/net/e1000e_core.c:934:9
#8 in e1000e_set_tctl /hw/net/e1000e_core.c:2431:9
#9 in e1000e_core_write /hw/net/e1000e_core.c:3265:9
#10 in e1000e_mmio_write /hw/net/e1000e.c:109:5
#11 in memory_region_write_accessor /memory.c:483:5
#12 in access_with_adjusted_size /memory.c:544:18
#13 in memory_region_dispatch_write /memory.c:1476:16
#14 in flatview_write_continue /exec.c:3146:23
#15 in flatview_write /exec.c:3186:14
#16 in address_space_write /exec.c:3280:18
#17 in address_space_rw /exec.c:3290:16
#18 in dma_memory_rw_relaxed /include/sysemu/dma.h:87:18
#19 in dma_memory_rw /include/sysemu/dma.h:113:12
#20 in pci_dma_rw /include/hw/pci/pci.h:789:5
#21 in pci_dma_write /include/hw/pci/pci.h:802:12
#22 in e1000e_write_to_rx_buffers /hw/net/e1000e_core.c:1412:9
#23 in e1000e_write_packet_to_guest /hw/net/e1000e_core.c:1582:21
#24 in e1000e_receive_iov /hw/net/e1000e_core.c:1709:9
#25 in e1000e_nc_receive_iov /hw/net/e1000e.c:213:12
#26 in net_tx_pkt_sendv /hw/net/net_tx_pkt.c:544:9
#27 in net_tx_pkt_send /hw/net/net_tx_pkt.c:620:9
#28 in net_tx_pkt_send_loopback /hw/net/net_tx_pkt.c:633:11
#29 in e1000e_tx_pkt_send /hw/net/e1000e_core.c:664:16
previously allocated by thread T0 here:
#0 in posix_memalign (/build/i386-softmmu/qemu-system-i386+)
#1 in qemu_try_memalign /util/oslib-posix.c:198:11
#2 in qemu_memalign /util/oslib-posix.c:214:27
#3 in address_space_map /exec.c:3558:25
#4 in dma_memory_map /include/sysemu/dma.h:138:9
#5 in pci_dma_map /include/hw/pci/pci.h:832:11
#6 in net_tx_pkt_add_raw_fragment /hw/net/net_tx_pkt.c:391:24
#7 in e1000e_process_tx_desc /hw/net/e1000e_core.c:731:14
#8 in e1000e_start_xmit /hw/net/e1000e_core.c:934:9
#9 in e1000e_set_tctl /hw/net/e1000e_core.c:2431:9
#10 in e1000e_core_write /hw/net/e1000e_core.c:3265:9
#11 in e1000e_mmio_write /hw/net/e1000e.c:109:5
#12 in memory_region_write_accessor /memory.c:483:5
#13 in access_with_adjusted_size /memory.c:544:18
#14 in memory_region_dispatch_write /memory.c:1476:16
#15 in flatview_write_continue /exec.c:3146:23
#16 in flatview_write /exec.c:3186:14
#17 in address_space_write /exec.c:3280:18
#18 in qtest_process_command /qtest.c:567:9
#19 in qtest_process_inbuf /qtest.c:710:9
#20 in qtest_read /qtest.c:722:5
#21 in qemu_chr_be_write_impl /chardev/char.c:188:9
#22 in qemu_chr_be_write /chardev/char.c:200:9
#23 in fd_chr_read /chardev/char-fd.c:68:9
#24 in qio_channel_fd_source_dispatch /io/channel-watch.c:84:12
#25 in g_main_context_dispatch (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+)
-Alex
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