( )⚙ D5465 fuzz: new fuzzer for parsers.fm1readmarkers

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Differential D5465

fuzz: new fuzzer for parsers.fm1readmarkers
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Authored by durin42 on Dec 20 2018, 1:41 AM.

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rHG6a951f535fee: fuzz: new fuzzer for parsers.fm1readmarkers
rHGb4a0062b1bac: fuzz: new fuzzer for parsers.fm1readmarkers
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durin42 created this revision.Dec 20 2018, 1:41 AM
Closed by commit rHGb4a0062b1bac: fuzz: new fuzzer for parsers.fm1readmarkers (authored by durin42). · Explain WhyDec 20 2018, 7:34 AM
This revision was automatically updated to reflect the committed changes.

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Changeset List

Diff 12914

contrib/fuzz/Makefile

-I../../mercurial dirstate.cc \ -I../../mercurial dirstate.cc \
manifest.o charencode.o parsers.o dirs.o pathencode.o revlog.o pyutil.o \ manifest.o charencode.o parsers.o dirs.o pathencode.o revlog.o pyutil.o \
-lFuzzingEngine `$$OUT/sanpy/bin/python-config --ldflags` \ -lFuzzingEngine `$$OUT/sanpy/bin/python-config --ldflags` \
-o $$OUT/dirstate_fuzzer -o $$OUT/dirstate_fuzzer
dirstate_corpus.zip: dirstate_corpus.zip:
python dirstate_corpus.py $$OUT/dirstate_fuzzer_seed_corpus.zip python dirstate_corpus.py $$OUT/dirstate_fuzzer_seed_corpus.zip
fm1readmarkers_fuzzer: sanpy fm1readmarkers.cc manifest.o charencode.o parsers.o dirs.o pathencode.o revlog.o pyutil.o
$(CXX) $(CXXFLAGS) `$$OUT/sanpy/bin/python-config --cflags` \
-Wno-register -Wno-macro-redefined \
-I../../mercurial fm1readmarkers.cc \
manifest.o charencode.o parsers.o dirs.o pathencode.o revlog.o pyutil.o \
-lFuzzingEngine `$$OUT/sanpy/bin/python-config --ldflags` \
-o $$OUT/fm1readmarkers_fuzzer
fm1readmarkers_corpus.zip:
python fm1readmarkers_corpus.py $$OUT/fm1readmarkers_fuzzer_seed_corpus.zip
clean: clean:
$(RM) *.o *_fuzzer \ $(RM) *.o *_fuzzer \
bdiff \ bdiff \
mpatch \ mpatch \
xdiff xdiff
oss-fuzz: bdiff_fuzzer mpatch_fuzzer mpatch_corpus.zip xdiff_fuzzer manifest_fuzzer manifest_corpus.zip revlog_fuzzer revlog_corpus.zip dirstate_fuzzer dirstate_corpus.zip oss-fuzz: bdiff_fuzzer mpatch_fuzzer mpatch_corpus.zip xdiff_fuzzer manifest_fuzzer manifest_corpus.zip revlog_fuzzer revlog_corpus.zip dirstate_fuzzer dirstate_corpus.zip fm1readmarkers_fuzzer fm1readmarkers_corpus.zip
.PHONY: all clean oss-fuzz sanpy .PHONY: all clean oss-fuzz sanpy

contrib/fuzz/fm1readmarkers.cc

  • This file was added.
#include <Python.h>
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <string>
#include "pyutil.h"
extern "C" {
static PyCodeObject *code;
extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv)
{
contrib::initpy(*argv[0]);
code = (PyCodeObject *)Py_CompileString(R"py(
from parsers import fm1readmarkers
def maybeint(s, default):
try:
return int(s)
except ValueError:
return default
try:
parts = data.split('\0', 2)
if len(parts) == 3:
offset, stop, data = parts
elif len(parts) == 2:
stop, data = parts
offset = 0
else:
offset = stop = 0
offset, stop = maybeint(offset, 0), maybeint(stop, len(data))
fm1readmarkers(data, offset, stop)
except Exception as e:
pass
# uncomment this print if you're editing this Python code
# to debug failures.
# print e
)py",
"fuzzer", Py_file_input);
return 0;
}
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
{
PyObject *text =
PyBytes_FromStringAndSize((const char *)Data, (Py_ssize_t)Size);
PyObject *locals = PyDict_New();
PyDict_SetItemString(locals, "data", text);
PyObject *res = PyEval_EvalCode(code, contrib::pyglobals(), locals);
if (!res) {
PyErr_Print();
}
Py_XDECREF(res);
Py_DECREF(locals);
Py_DECREF(text);
return 0; // Non-zero return values are reserved for future use.
}
}

contrib/fuzz/fm1readmarkers_corpus.py

  • This file was added.
from __future__ import absolute_import, print_function
import argparse
import os
import zipfile
ap = argparse.ArgumentParser()
ap.add_argument("out", metavar="some.zip", type=str, nargs=1)
args = ap.parse_args()
with zipfile.ZipFile(args.out[0], "w", zipfile.ZIP_STORED) as zf:
zf.writestr(
'smallish_obsstore',
(
# header: fm1readmarkers should start at offset 1, and
# read until byte 597.
'1\x00597\x00'
# body of obsstore file
'\x01\x00\x00\x00vA\xd7\x02+C\x1a<)\x01,\x00\x00\x01\x03\x03\xe6'
'\x92\xde)x\x16\xd1Xph\xc7\xa7[\xe5\xe2\x1a\xab\x1e6e\xaf\xc2\xae'
'\xe7\xbc\x83\xe1\x88\xa5\xda\xce>O\xbd\x04\xe9\x03\xc4o\xeb\x03'
'\x01\t\x05\x04\x1fef18operationamenduserAugie Fackler <raf@duri'
'n42.com>\x00\x00\x00vA\xd7\x02-\x8aD\xaf-\x01,\x00\x00\x01\x03\x03'
'\x17*\xca\x8f\x9e}i\xe0i\xbb\xdf\x9fb\x03\xd2XG?\xd3h\x98\x89\x1a'
'=2\xeb\xc3\xc5<\xb3\x9e\xcc\x0e;#\xee\xc3\x10ux\x03\x01\t\x05\x04'
'\x1fef18operationamenduserAugie Fackler <raf@durin42.com>\x00\x00'
'\x00vA\xd7\x02Mn\xd9%\xea\x01,\x00\x00\x01\x03\x03\x98\x89\x1a='
'2\xeb\xc3\xc5<\xb3\x9e\xcc\x0e;#\xee\xc3\x10ux\xe0*\xcaT\x86Z8J'
'\x85)\x97\xff7\xcc)\xc1\x7f\x19\x0c\x01\x03\x01\t\x05\x04\x1fef'
'18operationamenduserAugie Fackler <raf@durin42.com>\x00\x00\x00'
'yA\xd7\x02MtA\xbfj\x01,\x00\x00\x01\x03\x03\xe0*\xcaT\x86Z8J\x85'
')\x97\xff7\xcc)\xc1\x7f\x19\x0c\x01\x00\x94\x01\xa9\n\xf80\x92\xa3'
'j\xc5X\xb1\xc9:\xd51\xb8*\xa9\x03\x01\t\x08\x04\x1fef11operatio'
'nhistedituserAugie Fackler <raf@durin42.com>\x00\x00\x00yA\xd7\x02'
'MtA\xd4\xe1\x01,\x00\x00\x01\x03\x03"\xa5\xcb\x86\xb6\xf4\xbaO\xa0'
'sH\xe7?\xcb\x9b\xc2n\xcfI\x9e\x14\xf0D\xf0!\x18DN\xcd\x97\x016\xa5'
'\xef\xa06\xcb\x884\x8a\x03\x01\t\x08\x04\x1fef14operationhisted'))