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[binutils] Add new fuzzer (#4128) 

* cleaned up Dockerfile, added new fuzzer, updated build script

* added license header to fuzz_demangle.c
This commit is contained in:
Ravi Jotwani 2020-07-14 08:05:51 -07:00 committed by GitHub
parent 49149c244f
commit 6d59abf3ca
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3 changed files with 35 additions and 8 deletions
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6
projects/binutils/Dockerfile
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@ -16,11 +16,9 @@
FROM gcr.io/oss-fuzz-base/base-builder
#TODO change
RUN apt-get update && apt-get install -y make
RUN apt-get install -y flex bison
RUN apt-get update && apt-get install -y make flex bison
RUN git clone --recursive --depth 1 git://sourceware.org/git/binutils-gdb.git binutils-gdb
WORKDIR $SRC
COPY build.sh $SRC/
COPY fuzz_*.c $SRC/
COPY fuzz_*.c *.options $SRC/
COPY fuzz_readelf_seed_corpus $SRC/fuzz_readelf_seed_corpus
COPY fuzz_readelf.options $SRC/fuzz_readelf.options

8
projects/binutils/build.sh
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@ -37,7 +37,7 @@ mkdir fuzz
cp ../fuzz_*.c fuzz/
cd fuzz
for i in fuzz_disassemble fuzz_bfd; do
for i in fuzz_disassemble fuzz_bfd fuzz_demangle; do
$CC $CFLAGS -I ../include -I ../bfd -I ../opcodes -c $i.c -o $i.o
$CXX $CXXFLAGS $i.o -o $OUT/$i $LIB_FUZZING_ENGINE ../opcodes/libopcodes.a ../bfd/libbfd.a ../libiberty/libiberty.a ../zlib/libz.a
done
@ -59,12 +59,12 @@ done
# Link the files
## Readelf
$CXX $CXXFLAGS $LIB_FUZZING_ENGINE -W -Wall -I./../zlib -o fuzz_readelf fuzz_readelf.o version.o unwind-ia64.o dwarf.o elfcomm.o ../libctf/.libs/libctf-nobfd.a -L/src/binutils-gdb/zlib -lz ../libiberty/libiberty.a
$CXX $CXXFLAGS $LIB_FUZZING_ENGINE -W -Wall -I./../zlib -o fuzz_readelf fuzz_readelf.o version.o unwind-ia64.o dwarf.o elfcomm.o ../libctf/.libs/libctf-nobfd.a -L/src/binutils-gdb/zlib -lz ../libiberty/libiberty.a
mv fuzz_readelf $OUT/fuzz_readelf
### Set up seed corpus for readelf in the form of a single ELF file.
### Set up seed corpus for readelf in the form of a single ELF file.
zip fuzz_readelf_seed_corpus.zip /src/fuzz_readelf_seed_corpus/simple_elf
mv fuzz_readelf_seed_corpus.zip $OUT/
mv fuzz_readelf_seed_corpus.zip $OUT/
## Copy over the options file
cp $SRC/fuzz_readelf.options $OUT/fuzz_readelf.options

29
projects/binutils/fuzz_demangle.c Normal file
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@ -0,0 +1,29 @@
// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "demangle.h"
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
char *name = malloc(sizeof(char) * (size + 1));
memcpy(name, data, size);
name[size] = '\0'; // NUL-terminate
char *demangled = cplus_demangle(name, DMGL_AUTO);
if (demangled) free(demangled);
free(name);
return 0;
}