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add fuzzer driver, integrate with build system

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This commit is contained in:
Randy 2019-08-24 17:42:48 +02:00
parent 2d6db59c7b
commit bd1a375028
3 changed files with 76 additions and 9 deletions
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5
fuzzing/CMakeLists.txt
View File

@ -26,3 +26,8 @@ if (ENABLE_FUZZING)
endif()
if(ENABLE_CJSON_TEST)
ADD_EXECUTABLE(fuzz_main fuzz_main.c)
TARGET_LINK_LIBRARIES(fuzz_main cjson)
endif()

24
fuzzing/cjson_read_fuzzer.cc
View File

@ -4,9 +4,17 @@
#include "../cJSON.h"
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
#ifdef __cplusplus
extern "C"
#endif
int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
{
cJSON *json;
size_t offset = 4;
unsigned char *copied;
char *printed_json = NULL;
int minify, require_termination, formatted, buffered;
if(size <= offset) return 0;
if(data[0] != '1' && data[0] != '0') return 0;
@ -14,18 +22,18 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
if(data[2] != '1' && data[2] != '0') return 0;
if(data[3] != '1' && data[3] != '0') return 0;
int minify = data[0] == '1' ? 1 : 0;
int require_termination = data[1] == '1' ? 1 : 0;
int formatted = data[2] == '1' ? 1 : 0;
int buffered = data[3] == '1' ? 1 : 0;
minify = data[0] == '1' ? 1 : 0;
require_termination = data[1] == '1' ? 1 : 0;
formatted = data[2] == '1' ? 1 : 0;
buffered = data[3] == '1' ? 1 : 0;
unsigned char *copied = (unsigned char*)malloc(size);
copied = (unsigned char*)malloc(size);
if(copied == NULL) return 0;
memcpy(copied, data, size);
copied[size-1] = '\0';
cJSON *json = cJSON_ParseWithOpts((const char*)copied + offset, NULL, require_termination);
json = cJSON_ParseWithOpts((const char*)copied + offset, NULL, require_termination);
if(json == NULL)
{
@ -33,8 +41,6 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
return 0;
}
char *printed_json = NULL;
if(buffered)
{
printed_json = cJSON_PrintBuffered(json, 1, formatted);

56
fuzzing/fuzz_main.c Normal file
View File

@ -0,0 +1,56 @@
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size); /* required by C90 */
#include "cjson_read_fuzzer.cc"
/* fuzz target entry point, works without libFuzzer */
int main(int argc, char **argv)
{
FILE *f;
char *buf = NULL;
long siz_buf;
if(argc < 2)
{
fprintf(stderr, "no input file\n");
goto err;
}
f = fopen(argv[1], "rb");
if(f == NULL)
{
fprintf(stderr, "error opening input file %s\n", argv[1]);
goto err;
}
fseek(f, 0, SEEK_END);
siz_buf = ftell(f);
rewind(f);
if(siz_buf < 1) goto err;
buf = (char*)malloc((size_t)siz_buf);
if(buf == NULL)
{
fprintf(stderr, "malloc() failed\n");
goto err;
}
if(fread(buf, (size_t)siz_buf, 1, f) != 1)
{
fprintf(stderr, "fread() failed\n");
goto err;
}
(void)LLVMFuzzerTestOneInput((uint8_t*)buf, (size_t)siz_buf);
err:
free(buf);
return 0;
}