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/*
* libgit2 packfile fuzzer target.
*
* 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 "git2/sys/mempack.h"
#include "common.h"
#include "str.h"
#include "standalone_driver.h"
static git_odb *odb = NULL;
static git_odb_backend *mempack = NULL;
/* Arbitrary object to seed the ODB. */
static const unsigned char base_obj[] = { 07, 076 };
static const unsigned int base_obj_len = 2;
int LLVMFuzzerInitialize(int *argc, char ***argv)
{
GIT_UNUSED(argc);
GIT_UNUSED(argv);
if (git_libgit2_init() < 0) {
fprintf(stderr, "Failed to initialize libgit2\n");
abort();
}
if (git_libgit2_opts(GIT_OPT_SET_PACK_MAX_OBJECTS, 10000000) < 0) {
fprintf(stderr, "Failed to limit maximum pack object count\n");
abort();
}
if (git_odb_new(&odb) < 0) {
fprintf(stderr, "Failed to create the odb\n");
abort();
}
if (git_mempack_new(&mempack) < 0) {
fprintf(stderr, "Failed to create the mempack\n");
abort();
}
if (git_odb_add_backend(odb, mempack, 999) < 0) {
fprintf(stderr, "Failed to add the mempack\n");
abort();
}
return 0;
}
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
git_indexer_progress stats = {0, 0};
git_indexer *indexer = NULL;
git_str path = GIT_STR_INIT;
git_oid oid;
bool append_hash = false;
if (size == 0)
return 0;
if (!odb || !mempack) {
fprintf(stderr, "Global state not initialized\n");
abort();
}
git_mempack_reset(mempack);
if (git_odb_write(&oid, odb, base_obj, base_obj_len, GIT_OBJECT_BLOB) < 0) {
fprintf(stderr, "Failed to add an object to the odb\n");
abort();
}
if (git_indexer_new(&indexer, ".", 0, odb, NULL) < 0) {
fprintf(stderr, "Failed to create the indexer: %s\n",
git_error_last()->message);
abort();
}
/*
* If the first byte in the stream has the high bit set, append the
* SHA1 hash so that the packfile is somewhat valid.
*/
append_hash = *data & 0x80;
++data;
--size;
if (git_indexer_append(indexer, data, size, &stats) < 0)
goto cleanup;
if (append_hash) {
if (git_odb_hash(&oid, data, size, GIT_OBJECT_BLOB) < 0) {
fprintf(stderr, "Failed to compute the SHA1 hash\n");
abort();
}
if (git_indexer_append(indexer, &oid, sizeof(oid), &stats) < 0) {
goto cleanup;
}
}
if (git_indexer_commit(indexer, &stats) < 0)
goto cleanup;
if (git_str_printf(&path, "pack-%s.idx", git_oid_tostr_s(git_indexer_hash(indexer))) < 0)
goto cleanup;
p_unlink(git_str_cstr(&path));
git_str_clear(&path);
if (git_str_printf(&path, "pack-%s.pack", git_oid_tostr_s(git_indexer_hash(indexer))) < 0)
goto cleanup;
p_unlink(git_str_cstr(&path));
cleanup:
git_mempack_reset(mempack);
git_indexer_free(indexer);
git_str_dispose(&path);
return 0;
}
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