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deleted
Hello,
An heap-use-after-free issue was found in hw/net/eepro100.c:616 in latest version 5.2.0.
This issue was found when I was debugging Qemu in monitor. When I attach An eepro100 NIC, and reload the snapshot, the use-after-free triggers.
Qemu boot command is as follows:
./qemu-5.2.0-rc4/build/qemu-system-x86_64 -enable-kvm -boot c -m 2G -drive format=qcow2,file=./ubuntu.img -display none -monitor stdio
(qemu) device_add i82559a,id=eepro
(qemu) device_del eepro
(qemu) savevm tag0
(qemu) loadvm tag0
Backtrace is as follows:
=================================================================
==32048==ERROR: AddressSanitizer: heap-use-after-free on address 0x6280000449f0 at pc 0x7f751f5eed1a bp 0x7ffcd01f2cf0 sp 0x7ffcd01f2498
WRITE of size 8 at 0x6280000449f0 thread T0
#0 0x7f751f5eed19 (/usr/lib/x86_64-linux-gnu/libasan.so.4+0x5ed19)
#1 0x55948f3c9287 in nic_reset ../hw/net/eepro100.c:616
#2 0x5594900f481a in qemu_devices_reset ../hw/core/reset.c:69
#3 0x55948fae72e7 in pc_machine_reset ../hw/i386/pc.c:1615
#4 0x55948fda10af in qemu_system_reset ../softmmu/vl.c:1405
#5 0x55948f1ce8ed in load_snapshot ../migration/savevm.c:3008
#6 0x55948f7420e9 in hmp_loadvm ../monitor/hmp-cmds.c:1133
#7 0x55948f7e4319 in handle_hmp_command ../monitor/hmp.c:1100
#8 0x55948f7dbf1f in monitor_command_cb ../monitor/hmp.c:47
#9 0x559490599854 in readline_handle_byte ../util/readline.c:408
#10 0x55948f7e635a in monitor_read ../monitor/hmp.c:1340
#11 0x5594900c25c5 in qemu_chr_be_write_impl ../chardev/char.c:201
#12 0x5594900c266b in qemu_chr_be_write ../chardev/char.c:213
#13 0x5594900df9ce in fd_chr_read ../chardev/char-fd.c:68
#14 0x55949011f217 in qio_channel_fd_source_dispatch ../io/channel-watch.c:84
#15 0x7f751e056284 in g_main_context_dispatch (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x4c284)
#16 0x559490580e97 in glib_pollfds_poll ../util/main-loop.c:221
#17 0x559490580fb3 in os_host_main_loop_wait ../util/main-loop.c:244
#18 0x55949058124f in main_loop_wait ../util/main-loop.c:520
#19 0x55948fda1e53 in qemu_main_loop ../softmmu/vl.c:1678
#20 0x55948f183c76 in main ../softmmu/main.c:50
#21 0x7f751a8e3b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
#22 0x55948f183b69 in _start (/home/zjusvn/qemu5-hypervisor/qemu-5.2.0-rc4/build/qemu-system-x86_64+0x19c6b69)
0x6280000449f0 is located 2288 bytes inside of 15616-byte region [0x628000044100,0x628000047e00)
freed by thread T1 here:
#0 0x7f751f66e7a8 in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xde7a8)
#1 0x5594900ade06 in object_finalize ../qom/object.c:689
#2 0x5594900b04fe in object_unref ../qom/object.c:1183
#3 0x5594900eae68 in bus_free_bus_child ../hw/core/qdev.c:56
#4 0x55949055d2d7 in call_rcu_thread ../util/rcu.c:281
#5 0x5594905ad296 in qemu_thread_start ../util/qemu-thread-posix.c:521
#6 0x7f751acba6da in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x76da)
previously allocated by thread T0 here:
#0 0x7f751f66eb40 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb40)
#1 0x7f751e05bab8 in g_malloc (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x51ab8)
#2 0x5594900ae04f in object_new ../qom/object.c:744
#3 0x5594900ec0c3 in qdev_new ../hw/core/qdev.c:154
#4 0x55948f37b084 in qdev_device_add ../softmmu/qdev-monitor.c:654
#5 0x55948f37c36d in qmp_device_add ../softmmu/qdev-monitor.c:805
#6 0x55948f37cd40 in hmp_device_add ../softmmu/qdev-monitor.c:916
#7 0x55948f7e4319 in handle_hmp_command ../monitor/hmp.c:1100
#8 0x55948f7dbf1f in monitor_command_cb ../monitor/hmp.c:47
#9 0x559490599854 in readline_handle_byte ../util/readline.c:408
#10 0x55948f7e635a in monitor_read ../monitor/hmp.c:1340
#11 0x5594900c25c5 in qemu_chr_be_write_impl ../chardev/char.c:201
#12 0x5594900c266b in qemu_chr_be_write ../chardev/char.c:213
#13 0x5594900df9ce in fd_chr_read ../chardev/char-fd.c:68
#14 0x55949011f217 in qio_channel_fd_source_dispatch ../io/channel-watch.c:84
#15 0x7f751e056284 in g_main_context_dispatch (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x4c284)
Thread T1 created by T0 here:
#0 0x7f751f5c7d2f in __interceptor_pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.4+0x37d2f)
#1 0x5594905ad673 in qemu_thread_create ../util/qemu-thread-posix.c:558
#2 0x55949055d8f0 in rcu_init_complete ../util/rcu.c:379
#3 0x55949055dab9 in rcu_init ../util/rcu.c:435
#4 0x55949068e5dc in __libc_csu_init (/home/zjusvn/qemu5-hypervisor/qemu-5.2.0-rc4/build/qemu-system-x86_64+0x2ed15dc)
SUMMARY: AddressSanitizer: heap-use-after-free (/usr/lib/x86_64-linux-gnu/libasan.so.4+0x5ed19)
Shadow bytes around the buggy address:
0x0c50800008e0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c50800008f0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c5080000900: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c5080000910: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c5080000920: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x0c5080000930: fd fd fd fd fd fd fd fd fd fd fd fd fd fd[fd]fd
0x0c5080000940: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c5080000950: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c5080000960: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c5080000970: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c5080000980: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==32048==ABORTING
Thanks.
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