gtp.uts fixed #7
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wataash
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Feb 17, 2020
errno set by pcap_open_live(3) (typically EPERM or ENXIO) was not
checked, eventually causing a segmentation violation at
pcap_get_selectable_fd():
$ python3 -c 'from scapy.all import *; conf.use_pcap = True; sendp("", iface="nonexist0")'
fish: “python3 -c 'from scapy.all impo…” terminated by signal SIGSEGV (Address boundary error)
because pcap_get_selectable_fd(3) refered to NULL:
(gdb) bt
#0 pcap_get_selectable_fd (p=0x0) at ./pcap.c:1419
secdev#1 0x00007f963a72781e in ffi_call_unix64 () from /lib/x86_64-linux-gnu/libffi.so.6
secdev#2 0x00007f963a7271ef in ffi_call () from /lib/x86_64-linux-gnu/libffi.so.6
secdev#3 0x00007f963b17cf49 in _call_function_pointer (flags=flags@entry=4353, pProc=pProc@entry=0x7f96382d1300 <pcap_get_selectable_fd>, avalues=0x7ffd96028bd0,
atypes=<optimized out>, restype=<optimized out>, resmem=resmem@entry=0x7ffd96028be0, argcount=1) at ./Modules/_ctypes/callproc.c:827
secdev#4 0x00007f963b17d965 in _ctypes_callproc (pProc=pProc@entry=0x7f96382d1300 <pcap_get_selectable_fd>, argtuple=argtuple@entry=0x7f963b263608, flags=4353,
argtypes=argtypes@entry=0x7f9638360d58, restype=restype@entry=0x18d7628, checker=checker@entry=0x0) at ./Modules/_ctypes/callproc.c:1184
secdev#5 0x00007f963b176401 in PyCFuncPtr_call (self=0x7f963836bcf0, inargs=<optimized out>, kwds=<optimized out>) at ./Modules/_ctypes/_ctypes.c:3969
secdev#6 0x000000000043730f in ?? ()
secdev#7 0x00007f96382823b8 in ?? ()
secdev#8 0x0000000000000000 in ?? ()
(gdb) l
1414
1415 #if !defined(_WIN32) && !defined(MSDOS)
1416 int
1417 pcap_get_selectable_fd(pcap_t *p)
1418 {
1419 return (p->selectable_fd);
1420 }
1421 #endif
1422
1423 void
(gdb) p p
$1 = (pcap_t *) 0x0
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