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** Changed in: qemu
Status: New => Incomplete
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1904652
Title:
Assertion failure in usb-ohci
Status in QEMU:
Incomplete
Bug description:
Hello,
Using hypervisor fuzzer, hyfuzz, I found an assertion failure through
usb-ohci.
A malicious guest user/process could use this flaw to abort the QEMU
process on the host, resulting in a denial of service.
This was found in version 5.2.0 (master)
--------
```
Program terminated with signal SIGABRT, Aborted.
#0 __GI_raise (sig=sig@entry=0x6) at ../sysdeps/unix/sysv/linux/raise.c:51
51 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
[Current thread is 1 (Thread 0x7f34d0411440 (LWP 9418))]
gdb-peda$ bt
#0 0x00007f34c8d4ef47 in __GI_raise (sig=sig@entry=0x6) at
../sysdeps/unix/sysv/linux/raise.c:51
#1 0x00007f34c8d508b1 in __GI_abort () at abort.c:79
#2 0x000055d3a2081844 in ohci_frame_boundary (opaque=0x55d3a4ecdaf0) at
../hw/usb/hcd-ohci.c:1297
#3 0x000055d3a25be155 in timerlist_run_timers (timer_list=0x55d3a3fd9840) at
../util/qemu-timer.c:574
#4 0x000055d3a25beaba in qemu_clock_run_timers (type=QEMU_CLOCK_VIRTUAL) at
../util/qemu-timer.c:588
#5 0x000055d3a25beaba in qemu_clock_run_all_timers () at
../util/qemu-timer.c:670
#6 0x000055d3a25e69a1 in main_loop_wait (nonblocking=<optimized out>) at
../util/main-loop.c:531
#7 0x000055d3a2433972 in qemu_main_loop () at ../softmmu/vl.c:1678
#8 0x000055d3a1d0969b in main (argc=<optimized out>, argc@entry=0x15,
argv=<optimized out>,
argv@entry=0x7ffc6de722a8, envp=<optimized out>) at ../softmmu/main.c:50
#9 0x00007f34c8d31b97 in __libc_start_main (main=
0x55d3a1d09690 <main>, argc=0x15, argv=0x7ffc6de722a8, init=<optimized
out>, fini=<optimized out>, rtld_fini=<optimized out>,
stack_end=0x7ffc6de72298) at ../csu/libc-start.c:310
#10 0x000055d3a1d095aa in _start ()
```
To reproduce the assertion failure, please run the QEMU with the
following command line.
```
[Terminal 1]
$ qemu-system-i386 -m 512 -drive
file=./fs.img,index=1,media=disk,format=raw -drive
file=./hyfuzz.img,index=0,media=disk,format=raw -drive
if=none,id=stick,file=./usbdisk.img,format=raw -device pci-ohci,id=usb
-device usb-storage,bus=usb.0,drive=stick
[Terminal 2]
$ ./repro_log ./fs.img ./pci-ohci
```
Please let me know if I can provide any further info.
-Cheolwoo, Myung (Seoul National University)
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