Building JtR with AddressSanitizer (or ASan)
--------------------------------------------

./configure --enable-asan

make

../run/john --test


Disabling instrumentation of a particular function
--------------------------------------------------
Use "ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS" function attribute to disable
instrumentation of a particular function.

Current (Dec 2014) Supported build environments for ASan
--------------------------------------------------------
ASan is only supported under Linux or Apple environments, for Clang, and GCC 4.8 or
newer. It is not supported (at the current time) under MinGW or Cygwin, although it
will build on Cygwin's compiler, there simply is no supporting libasan.so library.

Parsing output
--------------
$ wget http://llvm.org/klaus/compiler-rt/raw/release_35/lib/asan/scripts/asan_symbolize.py
$ chmod +x asan_symbolize.py
$ mv -vi asan_symbolize.py /usr/local/bin

In a better world, this would have worked:
$ export ASAN_SYMBOLIZER_PATH=/usr/local/bin/asan_symbolize.py

...but we seem to need to paste the stack trace into asan_symbolize.py:

$ ./asan_symbolize.py
    #0 0xa094e6 (/home/fd/git/JtR/run/john+0xa094e6)
    #1 0xa0a846 (/home/fd/git/JtR/run/john+0xa0a846)
    #2 0x9ebb2f (/home/fd/git/JtR/run/john+0x9ebb2f)
    #3 0x9edb08 (/home/fd/git/JtR/run/john+0x9edb08)
    #4 0xa16555 (/home/fd/git/JtR/run/john+0xa16555)
    #5 0xa179bf (/home/fd/git/JtR/run/john+0xa179bf)
    #6 0x3bc2621d64 (/usr/lib64/libc-2.18.so+0x21d64)
    #7 0x405df0 (/home/fd/git/JtR/run/john+0x405df0)
llvm-symbolizer: for the -functions option: 'short' is invalid value for boolean argument! Try 0 or 1
    #0 0xa094e6 in fmt_self_test_body /home/fd/git/JtR/src/formats.c:405
    #1 0xa0a846 in fmt_self_test /home/fd/git/JtR/src/formats.c:611
    #2 0x9ebb2f in benchmark_format /home/fd/git/JtR/src/bench.c:171
    #3 0x9edb08 in benchmark_all /home/fd/git/JtR/src/bench.c:537 (discriminator 3)
    #4 0xa16555 in john_run /home/fd/git/JtR/src/john.c:1282
    #5 0xa179bf in main /home/fd/git/JtR/src/john.c:1651
    #6 0x3bc2621d64 in ?? ??:0
    #7 0x405df0 in _start ??:?
