tcpdump mailing list archives
Re: [tcpdump] coredump when launched in a ESX4 VM without interface parameter (#59)
From: Guy Harris <guy () alum mit edu>
Date: Tue, 26 Mar 2013 10:43:42 -0700
On Mar 26, 2013, at 9:07 AM, Michael Richardson <mcr () sandelman ca> wrote:
The fault seems to be inside of libusb: Using host libthread_db library "/usr/lib/libthread_db.so.1". Core was generated by `/usr/sbin/tcpdump icmp'. Program terminated with signal 11, Segmentation fault. #0 0x00007feae033fb50 in __opendirat () from /usr/lib/libc.so.6 (gdb) bt #0 0x00007feae033fb50 in __opendirat () from /usr/lib/libc.so.6 #1 0x00007feadfc68e9e in ?? () from /usr/lib/libusb-1.0.so.0 #2 0x00007feadfc6153c in libusb_get_device_list () from /usr/lib/libusb-1.0.so.0 #3 0x00007feae0647a9f in canusb_platform_finddevs () from /usr/lib/libpcap.so.1 It appears that it faults if there are no USB devices, which wouldn't be surprising for a VM.
It faults because it's being handed a NULL first argument, and it's being handed a NULL argument because libpcap isn't checking whether libusb_init() succeeded or not. So, while it's crashing inside libusb, that's because libpcap wasn't using libusb correctly. If you've filed a libusb bug, you might want to close it. This bug was fixed last year in commit 9f8827ee41bbf24c7dc98d5f6ff3790756e378f4 Author: Guy Harris <guy () alum mit edu> Date: Mon Aug 6 15:25:30 2012 -0700 Check whether libusb_init() succeeds, and give up if it doesn't. libusb_init() isn't guaranteed to succeed; it returns a (presumably) non-zero error on failure. If it doesn't return 0, just give up - we presumably don't have a valid libusb_context pointer, which is probably what's causing crashes when we call libusb_get_device_list() on a system with no usbfs mounted. This fixes bug 3554749 in the tracker, and a bunch of upstream bugs. _______________________________________________ tcpdump-workers mailing list tcpdump-workers () lists tcpdump org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
Current thread:
- Re: [tcpdump] coredump when launched in a ESX4 VM without interface parameter (#59) Michael Richardson (Mar 26)
- Re: [tcpdump] coredump when launched in a ESX4 VM without interface parameter (#59) Guy Harris (Mar 26)