mirror of
https://github.com/libgit2/libgit2.git
synced 2026-06-22 06:26:26 +00:00
f0e693b18a
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.
118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/*
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* libgit2 packfile fuzzer target.
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*
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* Copyright (C) the libgit2 contributors. All rights reserved.
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*
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* This file is part of libgit2, distributed under the GNU GPL v2 with
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* a Linking Exception. For full terms see the included COPYING file.
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*/
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#include <stdio.h>
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#include "git2.h"
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#include "git2/sys/mempack.h"
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#include "common.h"
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#include "str.h"
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static git_odb *odb = NULL;
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static git_odb_backend *mempack = NULL;
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/* Arbitrary object to seed the ODB. */
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static const unsigned char base_obj[] = { 07, 076 };
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static const unsigned int base_obj_len = 2;
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int LLVMFuzzerInitialize(int *argc, char ***argv)
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{
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GIT_UNUSED(argc);
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GIT_UNUSED(argv);
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if (git_libgit2_init() < 0) {
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fprintf(stderr, "Failed to initialize libgit2\n");
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abort();
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}
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if (git_libgit2_opts(GIT_OPT_SET_PACK_MAX_OBJECTS, 10000000) < 0) {
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fprintf(stderr, "Failed to limit maximum pack object count\n");
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abort();
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}
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if (git_odb_new(&odb) < 0) {
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fprintf(stderr, "Failed to create the odb\n");
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abort();
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}
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if (git_mempack_new(&mempack) < 0) {
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fprintf(stderr, "Failed to create the mempack\n");
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abort();
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}
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if (git_odb_add_backend(odb, mempack, 999) < 0) {
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fprintf(stderr, "Failed to add the mempack\n");
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abort();
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}
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return 0;
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}
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
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{
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git_indexer_progress stats = {0, 0};
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git_indexer *indexer = NULL;
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git_str path = GIT_STR_INIT;
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git_oid oid;
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bool append_hash = false;
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if (size == 0)
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return 0;
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if (!odb || !mempack) {
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fprintf(stderr, "Global state not initialized\n");
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abort();
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}
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git_mempack_reset(mempack);
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if (git_odb_write(&oid, odb, base_obj, base_obj_len, GIT_OBJECT_BLOB) < 0) {
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fprintf(stderr, "Failed to add an object to the odb\n");
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abort();
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}
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if (git_indexer_new(&indexer, ".", 0, odb, NULL) < 0) {
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fprintf(stderr, "Failed to create the indexer: %s\n",
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git_error_last()->message);
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abort();
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}
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/*
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* If the first byte in the stream has the high bit set, append the
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* SHA1 hash so that the packfile is somewhat valid.
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*/
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append_hash = *data & 0x80;
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++data;
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--size;
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if (git_indexer_append(indexer, data, size, &stats) < 0)
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goto cleanup;
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if (append_hash) {
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if (git_odb_hash(&oid, data, size, GIT_OBJECT_BLOB) < 0) {
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fprintf(stderr, "Failed to compute the SHA1 hash\n");
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abort();
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}
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if (git_indexer_append(indexer, &oid, sizeof(oid), &stats) < 0) {
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goto cleanup;
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}
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}
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if (git_indexer_commit(indexer, &stats) < 0)
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goto cleanup;
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if (git_str_printf(&path, "pack-%s.idx", git_oid_tostr_s(git_indexer_hash(indexer))) < 0)
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goto cleanup;
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p_unlink(git_str_cstr(&path));
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git_str_clear(&path);
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if (git_str_printf(&path, "pack-%s.pack", git_oid_tostr_s(git_indexer_hash(indexer))) < 0)
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goto cleanup;
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p_unlink(git_str_cstr(&path));
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cleanup:
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git_mempack_reset(mempack);
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git_indexer_free(indexer);
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git_str_dispose(&path);
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return 0;
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}
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