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Fix binutils fuzz target (#3317) 

* Fix binutils fuzz target

Compiler warnings
And undefined behavior against alignment

* Add license
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Catena cyber 2020-02-02 02:43:50 +01:00 committed by GitHub
parent 1a87da68c8
commit fa0ec600ff
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 20 additions and 9 deletions
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29
projects/binutils/fuzz_disassemble.c
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@ -1,3 +1,18 @@
/* Copyright 2020 Google Inc.
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 "sysdep.h"
#include "bfd.h"
#include "dis-asm.h"
@ -13,8 +28,9 @@ typedef struct
size_t pos;
} SFILE;
static int objdump_sprintf (SFILE *f, const char *format, ...)
static int objdump_sprintf (void *vf, const char *format, ...)
{
SFILE *f = (SFILE *) vf;
size_t n;
va_list args;
@ -31,16 +47,11 @@ static int objdump_sprintf (SFILE *f, const char *format, ...)
return n;
}
static void objdump_print_address (bfd_vma vma, struct disassemble_info *inf)
{
(*inf->fprintf_func) (inf->stream, "0x%x", vma);
}
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
char AssemblyText[MAX_TEXT_SIZE];
struct disassemble_info disasm_info;
SFILE s;
bfd abfd;
if (Size < 10) {
// 10 bytes for options
@ -49,9 +60,9 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
init_disassemble_info (&disasm_info, stdout, (fprintf_ftype) fprintf);
disasm_info.fprintf_func = objdump_sprintf;
disasm_info.print_address_func = objdump_print_address;
disasm_info.print_address_func = generic_print_address;
disasm_info.display_endian = disasm_info.endian = BFD_ENDIAN_LITTLE;
disasm_info.buffer = Data;
disasm_info.buffer = (bfd_byte *) Data;
disasm_info.buffer_vma = 0x1000;
disasm_info.buffer_length = Size-10;
disasm_info.insn_info_valid = 0;
@ -61,7 +72,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
disasm_info.bytes_per_line = 0;
disasm_info.arch = Data[Size-1];
disasm_info.mach = *((unsigned long *) (Data + Size - 9));
disasm_info.mach = bfd_getl64(&Data[Size-9]);
disasm_info.flavour = Data[Size-10];
if (bfd_lookup_arch (disasm_info.arch, disasm_info.mach) != NULL) {