binwalk/git segfault

[ghost]

[I] sys-apps/file (5.17@26.02.2014)
[I] dev-lang/python (2.7.6(2.7)@04.12.2013)

gdb --args python2.7 /usr/bin/binwalk /bin/ls
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Reading symbols from python2.7...(no debugging symbols found)...done.
(gdb) r
Starting program: /usr/bin/python2.7 /usr/bin/binwalk /bin/ls
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
warning: File "/usr/lib64/libpython2.7.so.1.0-gdb.py" auto-loading has been declined by your `auto-load safe-path' set to "/home/avatar/Devel/NP1UD/debug-sysroot:/home/avatar:$debugdir:$datadir/auto-load".
To enable execution of this file add
add-auto-load-safe-path /usr/lib64/libpython2.7.so.1.0-gdb.py
line to your configuration file "/home/avatar/.gdbinit".
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set auto-load safe-path /
line to your configuration file "/home/avatar/.gdbinit".
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[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7ffff6339700 (LWP 15228)]
WARNING: Failed to load plugin module 'compressd': Failed to locate library 'compress42'
WARNING: Failed to load plugin module 'zlibvalid': Failed to locate library 'tinfl'
WARNING: Failed to load plugin module 'compressd': Failed to locate library 'compress42'
WARNING: Failed to load plugin module 'zlibvalid': Failed to locate library 'tinfl'

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff5867057 in ?? () from /usr/lib64/libmagic.so.1
(gdb) bt
#0 0x00007ffff5867057 in ?? () from /usr/lib64/libmagic.so.1
#1 0x00007ffff5861143 in ?? () from /usr/lib64/libmagic.so.1
#2 0x00007ffff7e1b6e4 in ffi_call_unix64 () from /usr/lib64/libffi.so.6
#3 0x000000000000000a in ?? ()
#4 0x00007fffffff9c60 in ?? ()
#5 0x00007fffffff9bf0 in ?? ()
#6 0x00007ffff7e1b275 in ffi_call () from /usr/lib64/libffi.so.6

Backtrace stopped: previous frame inner to this frame (corrupt stack?)

[devttys0]

Interesting; based on the output it looks like libmagic is segfaulting during its initialization. What version of libmagic do you have installed on your system?

Also, how did you install binwalk, as it seems that not all components were installed properly (namely libcompress42 and libtinfl seem to be missing)?

[devttys0]

Any word on this? I have not been able to reproduce this on either 32 or 64 bit systems.

[devttys0]

Was able to reproduce the issue on a Mac; this was caused by improper handling of the magic_open return value in binwalk's ctypes wrapper (though it seems to work on some systems). The code in the master branch has been patched appropriately.