| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * 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 <assert.h> |
| #include <stdint.h> |
| #include <string.h> |
| |
| #include "expat.h" |
| #include "siphash.h" |
| |
| // Macros to convert preprocessor macros to string literals. See |
| // https://gcc.gnu.org/onlinedocs/gcc-3.4.3/cpp/Stringification.html |
| #define xstr(s) str(s) |
| #define str(s) #s |
| |
| // The encoder type that we wish to fuzz should come from the compile-time |
| // definition `ENCODING_FOR_FUZZING`. This allows us to have a separate fuzzer |
| // binary for |
| #ifndef ENCODING_FOR_FUZZING |
| # error "ENCODING_FOR_FUZZING was not provided to this fuzz target." |
| #endif |
| |
| // 16-byte deterministic hash key. |
| static unsigned char hash_key[16] = "FUZZING IS FUN!"; |
| |
| static void XMLCALL |
| start(void *userData, const XML_Char *name, const XML_Char **atts) { |
| (void)userData; |
| (void)name; |
| (void)atts; |
| } |
| static void XMLCALL |
| end(void *userData, const XML_Char *name) { |
| (void)userData; |
| (void)name; |
| } |
| |
| int |
| LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { |
| if (size == 0) |
| return 0; |
| |
| XML_Parser p = XML_ParserCreate(xstr(ENCODING_FOR_FUZZING)); |
| assert(p); |
| XML_SetElementHandler(p, start, end); |
| |
| // Set the hash salt using siphash to generate a deterministic hash. |
| struct sipkey *key = sip_keyof(hash_key); |
| XML_SetHashSalt(p, (unsigned long)siphash24(data, size, key)); |
| |
| void *buf = XML_GetBuffer(p, size); |
| assert(buf); |
| |
| memcpy(buf, data, size); |
| XML_ParseBuffer(p, size, size == 0); |
| XML_ParserFree(p); |
| return 0; |
| } |