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97 lines
3.0 KiB
97 lines
3.0 KiB
1 month ago
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/*
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Copyright 2015 Google LLC All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at:
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/*
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american fuzzy lop - persistent mode example
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--------------------------------------------
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Written and maintained by Michal Zalewski <lcamtuf@google.com>
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This file demonstrates the high-performance "persistent mode" that may be
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suitable for fuzzing certain fast and well-behaved libraries, provided that
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they are stateless or that their internal state can be easily reset
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across runs.
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To make this work, the library and this shim need to be compiled in LLVM
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mode using afl-clang-fast (other compiler wrappers will *not* work).
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <signal.h>
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#include <string.h>
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/* Main entry point. */
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int main(int argc, char** argv) {
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char buf[100]; /* Example-only buffer, you'd replace it with other global or
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local variables appropriate for your use case. */
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/* The number passed to __AFL_LOOP() controls the maximum number of
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iterations before the loop exits and the program is allowed to
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terminate normally. This limits the impact of accidental memory leaks
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and similar hiccups. */
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while (__AFL_LOOP(1000)) {
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/*** PLACEHOLDER CODE ***/
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/* STEP 1: Fully re-initialize all critical variables. In our example, this
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involves zeroing buf[], our input buffer. */
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memset(buf, 0, 100);
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/* STEP 2: Read input data. When reading from stdin, no special preparation
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is required. When reading from a named file, you need to close
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the old descriptor and reopen the file first!
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Beware of reading from buffered FILE* objects such as stdin. Use
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raw file descriptors or call fopen() / fdopen() in every pass. */
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read(0, buf, 100);
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/* STEP 3: This is where we'd call the tested library on the read data.
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We just have some trivial inline code that faults on 'foo!'. */
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if (buf[0] == 'f') {
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printf("one\n");
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if (buf[1] == 'o') {
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printf("two\n");
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if (buf[2] == 'o') {
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printf("three\n");
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if (buf[3] == '!') {
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printf("four\n");
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abort();
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}
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}
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}
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}
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/*** END PLACEHOLDER CODE ***/
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}
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/* Once the loop is exited, terminate normally - AFL will restart the process
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when this happens, with a clean slate when it comes to allocated memory,
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leftover file descriptors, etc. */
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return 0;
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}
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