thodg/libgit2/fuzzers/standalone_driver.c

• Show log

  Commit

• Hash : f0e693b1
  Author :
  Date : 2021-09-07T17:53:49
  

  str: introduce `git_str` for internal, `git_buf` is external
  
  libgit2 has two distinct requirements that were previously solved by
  `git_buf`.  We require:
  
  1. A general purpose string class that provides a number of utility APIs
     for manipulating data (eg, concatenating, truncating, etc).
  2. A structure that we can use to return strings to callers that they
     can take ownership of.
  
  By using a single class (`git_buf`) for both of these purposes, we have
  confused the API to the point that refactorings are difficult and
  reasoning about correctness is also difficult.
  
  Move the utility class `git_buf` to be called `git_str`: this represents
  its general purpose, as an internal string buffer class.  The name also
  is an homage to Junio Hamano ("gitstr").
  
  The public API remains `git_buf`, and has a much smaller footprint.  It
  is generally only used as an "out" param with strict requirements that
  follow the documentation.  (Exceptions exist for some legacy APIs to
  avoid breaking callers unnecessarily.)
  
  Utility functions exist to convert a user-specified `git_buf` to a
  `git_str` so that we can call internal functions, then converting it
  back again.
  

Download

• fuzzers/standalone_driver.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include <stdio.h>
  
  #include "git2.h"
  #include "futils.h"
  #include "path.h"
  
  extern int LLVMFuzzerTestOneInput(const unsigned char *data, size_t size);
  extern int LLVMFuzzerInitialize(int *argc, char ***argv);
  
  static int run_one_file(const char *filename)
  {
  	git_str buf = GIT_STR_INIT;
  	int error = 0;
  
  	if (git_futils_readbuffer(&buf, filename) < 0) {
  		fprintf(stderr, "Failed to read %s: %s\n", filename, git_error_last()->message);
  		error = -1;
  		goto exit;
  	}
  
  	LLVMFuzzerTestOneInput((const unsigned char *)buf.ptr, buf.size);
  exit:
  	git_str_dispose(&buf);
  	return error;
  }
  
  int main(int argc, char **argv)
  {
  	git_vector corpus_files = GIT_VECTOR_INIT;
  	char *filename = NULL;
  	unsigned i = 0;
  	int error = 0;
  
  	if (git_libgit2_init() < 0) {
  		fprintf(stderr, "Failed to initialize libgit2\n");
  		abort();
  	}
  
  	if (argc != 2) {
  		fprintf(stderr, "Usage: %s <corpus directory>\n", argv[0]);
  		error = -1;
  		goto exit;
  	}
  
  	fprintf(stderr, "Running %s against %s\n", argv[0], argv[1]);
  	LLVMFuzzerInitialize(&argc, &argv);
  
  	if (git_path_dirload(&corpus_files, argv[1], 0, 0x0) < 0) {
  		fprintf(stderr, "Failed to scan corpus directory '%s': %s\n",
  			argv[1], git_error_last()->message);
  		error = -1;
  		goto exit;
  	}
  	git_vector_foreach(&corpus_files, i, filename) {
  		fprintf(stderr, "\tRunning %s...\n", filename);
  		if (run_one_file(filename) < 0) {
  			error = -1;
  			goto exit;
  		}
  	}
  	fprintf(stderr, "Done %d runs\n", i);
  
  exit:
  	git_vector_free_deep(&corpus_files);
  	git_libgit2_shutdown();
  	return error;
  }
  

Download