empty SIG* files

[kokanin]

current git version creates empty crash files:
 wc -c SIG*
0 SIGABRT.PC.7ffff6be6198.STACK.2878eff05.CODE.-6.ADDR.(nil).INSTR.cmp____$0xfffffffffffff000,%rax.fuzz
0 SIGSEGV.PC.7ffff7a60afd.STACK.1837a41547.CODE.1.ADDR.0x7fffff7feff8.INSTR.callq__0x0000000000009cab.fuzz
0 SIGSEGV.PC.7ffff7a6321d.STACK.d7f536722.CODE.1.ADDR.0x7fffff7feff8.INSTR.callq__0x000000000000758b.fuzz
0 SIGSEGV.PC.7ffff7aa9962.STACK.1836e5ace.CODE.1.ADDR.0x7fffff7feeb8.INSTR.mov____%rdi,0x28(%rsp).fuzz
0 SIGSEGV.PC.7ffff7ab7f0c.STACK.15f222c5c.CODE.1.ADDR.0x7fffff7fef38.INSTR.mov____%rdx,0x18(%rsp).fuzz
0 SIGSEGV.PC.7ffff7abb1e0.STACK.2bd7616a5.CODE.1.ADDR.0x7fffff7fef88.INSTR.mov____%rdx,(%rsp).fuzz
0 SIGSEGV.PC.7ffff7b978fa.STACK.d2647e.CODE.1.ADDR.0x7fffff7feff8.INSTR.callq__0xffffffffffeb5fc6.fuzz
0 SIGSEGV.PC.7ffff7b9b6bf.STACK.1594f9b8c9.CODE.1.ADDR.0x7fffff7fef38.INSTR.mov____%rdx,-0x2a8(%rbp).fuzz

honggfuzz being invoked like this:
honggfuzz -q -n 10 -f crap/ -c ./external.sh -- /testbinary ___FILE___
external.sh:
#!/bin/bash
filename=`perl -e 'print rand(10);' | cut -d "." -f 2` # $RANDOM collides sometimes
radamsa -r crap/ > $filename
mv $filename $1

0.6 doesn't create the empty files, nor does 0.8.

[robertswiecki]

I think we should have two commands, one for creation of files, instead of mutators, and one for postprocessing them. So, I introduced --process_cmd (for post-process command).

ee266ac

If you simply want to modify files from the input directory with your command (and not with internal mutators) you might want to set "-r" (mutation max rate) to 0.0.

honggfuzz -r 0.0 --pprocess_cmd ./pprocess.sh -f IN -- /testbinary _FILE_