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Add a basic fuzz testing harness for dilithium2
Co-authored-by: Spencer Wilson <[email protected]> Signed-off-by: Nathaniel Brough <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| # Fuzzing | ||
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| Fuzz testing is an automated software testing method that injects invalid, | ||
| malformed, or unexpected inputs to reveal defects and vulnerabilities. A fuzzing | ||
| tool monitors the system for exceptions like crashes, information leakage, or | ||
| errors, helping developers identify and fix bugs and security loopholes. | ||
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| ## Current state of fuzzing in liboqs | ||
| - [ ] kem | ||
| - [ ] bike.md | ||
| - [ ] classic_mceliece.md | ||
| - [ ] frodokem.md | ||
| - [ ] hqc.md | ||
| - [ ] kyber.md | ||
| - [ ] ml_kem.md | ||
| - [ ] ntruprime.md | ||
| - [ ] sig | ||
| - [x] dilithium.md | ||
| - [ ] falcon.md | ||
| - [ ] mayo.md | ||
| - [ ] ml_dsa.md | ||
| - [ ] sphincs.md | ||
| - [ ] sig_stfl | ||
| - [ ] lms.md | ||
| - [ ] sig_stfl.md | ||
| - [ ] xmss.md | ||
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| ## Building and running fuzz tests | ||
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| Building fuzz tests is very similar to building normally with some optional | ||
| steps to target different types of bugs. The most basic ways to build the | ||
| fuzz tests is as follows; | ||
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| ```bash | ||
| mkdir build && cd build | ||
| cmake -GNinja .. -DOQS_BUILD_FUZZ_TESTS=ON | ||
| ninja -j$(nproc) | ||
| ``` | ||
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| You'll now be able to run a fuzz test e.g. | ||
| ```bash | ||
| ./tests/fuzz_test_dilithium2 | ||
| #9764 NEW cov: 4 ft: 708 corp: 100/318b lim: 43 exec/s: 9764 rss: 362Mb L: 41/41 MS: 4 EraseBytes-InsertRepeatedBytes-CMP-ChangeBit- DE: "\0004m\372"- | ||
| ... | ||
| ``` | ||
| The fuzzer will run indefinetely or; | ||
| - until it finds a bug and crashes, | ||
| - you manually stop the fuzzer i.e. CTRL-C | ||
| - you set a timeout using the command line. | ||
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| For more details on the available command line args please consult the [libfuzzer docs](https://llvm.org/docs/LibFuzzer.html). | ||
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| ## Sanitizers | ||
| It is a common pattern to combine fuzzing with various sanitizers to catch different bugs. | ||
| One of the simpler sanitizers is the fuzzing sanitizer, which will instrument the code | ||
| for coverage driven fuzzing. To enable this simply add this to your environment variables | ||
| before configuring cmake; | ||
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| ``` | ||
| export CFLAGS=-fsanitize=fuzzer-no-link | ||
| ``` | ||
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| It is common to combine the fuzzer sanitizer with either the [address](https://clang.llvm.org/docs/AddressSanitizer.html) | ||
| or the [undefined behaviour sanitizer](https://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html). To | ||
| add these simply add the relevant flags to BOTH the CFLAGS and LDFLAGS e.g. | ||
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| ``` | ||
| export CFLAGS=-fsanitize=fuzzer-no-link,address | ||
| export LDFLAGS=-fsanitize=address | ||
| ``` | ||
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| Then rerun cmake as normal i.e. | ||
| ```bash | ||
| mkdir build && cd build | ||
| cmake -GNinja .. -DOQS_BUILD_FUZZ_TESTS=ON | ||
| ninja -j$(nproc) | ||
| ``` |
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| /* | ||
| * fuzz_test_sig.c | ||
| * | ||
| * Minimal fuzz test for liboqs. | ||
| * | ||
| * SPDX-License-Identifier: MIT | ||
| */ | ||
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| #include <stdbool.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
| #include <stdlib.h> | ||
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| #include <oqs/oqs.h> | ||
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| void cleanup_heap(uint8_t *public_key, uint8_t *secret_key, | ||
| uint8_t *signature, | ||
| OQS_SIG *sig); | ||
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| static OQS_STATUS fuzz_dilithium_2(const uint8_t *message, size_t message_len) { | ||
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| #ifdef OQS_ENABLE_SIG_dilithium_2 | ||
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| OQS_SIG *sig = NULL; | ||
| uint8_t *public_key = NULL; | ||
| uint8_t *secret_key = NULL; | ||
| uint8_t *signature = NULL; | ||
| size_t signature_len; | ||
| OQS_STATUS rc; | ||
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| sig = OQS_SIG_new(OQS_SIG_alg_dilithium_2); | ||
| if (sig == NULL) { | ||
| printf("[example_heap] OQS_SIG_alg_dilithium_2 was not enabled at compile-time.\n"); | ||
| return OQS_ERROR; | ||
| } | ||
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| public_key = malloc(sig->length_public_key); | ||
| secret_key = malloc(sig->length_secret_key); | ||
| signature = malloc(sig->length_signature); | ||
| if ((public_key == NULL) || (secret_key == NULL) || (message == NULL) || (signature == NULL)) { | ||
| fprintf(stderr, "ERROR: malloc failed!\n"); | ||
| cleanup_heap(public_key, secret_key, signature, sig); | ||
| return OQS_ERROR; | ||
| } | ||
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| rc = OQS_SIG_keypair(sig, public_key, secret_key); | ||
| if (rc != OQS_SUCCESS) { | ||
| fprintf(stderr, "ERROR: OQS_SIG_keypair failed!\n"); | ||
| cleanup_heap(public_key, secret_key, signature, sig); | ||
| return OQS_ERROR; | ||
| } | ||
| rc = OQS_SIG_sign(sig, signature, &signature_len, message, message_len, secret_key); | ||
| if (rc != OQS_SUCCESS) { | ||
| fprintf(stderr, "ERROR: OQS_SIG_sign failed!\n"); | ||
| cleanup_heap(public_key, secret_key, signature, sig); | ||
| return OQS_ERROR; | ||
| } | ||
| rc = OQS_SIG_verify(sig, message, message_len, signature, signature_len, public_key); | ||
| if (rc != OQS_SUCCESS) { | ||
| fprintf(stderr, "ERROR: OQS_SIG_verify failed!\n"); | ||
| cleanup_heap(public_key, secret_key, signature, sig); | ||
| exit(1); | ||
| } | ||
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| cleanup_heap(public_key, secret_key, signature, sig); | ||
| return OQS_SUCCESS; // success | ||
| #else | ||
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| printf("[example_heap] OQS_SIG_dilithium_2 was not enabled at compile-time.\n"); | ||
| return OQS_SUCCESS; | ||
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| #endif | ||
| } | ||
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| void cleanup_heap(uint8_t *public_key, uint8_t *secret_key, | ||
| uint8_t *signature, | ||
| OQS_SIG *sig) { | ||
| if (sig != NULL) { | ||
| OQS_MEM_secure_free(secret_key, sig->length_secret_key); | ||
| } | ||
| OQS_MEM_insecure_free(public_key); | ||
| OQS_MEM_insecure_free(signature); | ||
| OQS_SIG_free(sig); | ||
| } | ||
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| int LLVMFuzzerTestOneInput(const char *data, size_t size) { | ||
| OQS_init(); | ||
| if (OQS_ERROR == fuzz_dilithium_2((const uint8_t *)data, size)) { | ||
| // If we get an error prune testcase from corpus. | ||
| return -1; | ||
| } | ||
| OQS_destroy(); | ||
| return 0; | ||
| } | ||
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