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fuzz: add fuzzer testing nDPI (initial) configurations (#1830)

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The goal of this fuzzer is to test init and deinit of the library, with
different configurations. In details:
* random memory allocation failures, even during init phase
* random `ndpi_init_prefs` parameter of `ndpi_init_detection_module()`
* random LRU caches sizes
* random bitmask of enabled protocols
* random parameters of `ndpi_set_detection_preferences()`
* random initialization of opportunistic TLS
* random load/don't load of configuration files

This new fuzzer is a C++ file, because it uses `FuzzedDataProvider`
class (see
https://github.com/google/fuzzing/blob/master/docs/split-inputs.md).
Note that the (existing) fuzzers need to be linked with C++ compiler
anyway, so this new fuzzer doesn't add any new requirements.
This commit is contained in:
Ivan Nardi 2022-12-23 19:07:13 +01:00 • committed by GitHub
parent 3de76812d9
commit 560280e6f0
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GPG key ID: 4AEE18F83AFDEB23
13 changed files with 310 additions and 60 deletions
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30
fuzz/fuzz_common_code.c
View file

@ -1,6 +1,32 @@
#include "fuzz_common_code.h"
#ifdef ENABLE_MEM_ALLOC_FAILURES
static int mem_alloc_state = 0;
__attribute__((no_sanitize("integer")))
static int fastrand ()
{
if(!mem_alloc_state) return 1; /* No failures */
mem_alloc_state = (214013 * mem_alloc_state + 2531011);
return (mem_alloc_state >> 16) & 0x7FFF;
}
void *malloc_wrapper(size_t size) {
return (fastrand () % 16) ? malloc (size) : NULL;
}
void free_wrapper(void *freeable) {
free(freeable);
}
void set_mem_alloc_state(int value) {
mem_alloc_state = value;
}
#endif
void fuzz_init_detection_module(struct ndpi_detection_module_struct **ndpi_info_mod,
int enable_log)
{
@ -8,6 +34,10 @@ void fuzz_init_detection_module(struct ndpi_detection_module_struct **ndpi_info_
NDPI_PROTOCOL_BITMASK all, debug_bitmask;
if(*ndpi_info_mod == NULL) {
#ifdef ENABLE_MEM_ALLOC_FAILURES
set_ndpi_malloc(malloc_wrapper);
set_ndpi_free(free_wrapper);
#endif
*ndpi_info_mod = ndpi_init_detection_module(prefs);
NDPI_BITMASK_SET_ALL(all);
ndpi_set_protocol_detection_bitmask2(*ndpi_info_mod, &all);