mirror of
https://git.proxmox.com/git/libgit2
synced 2025-05-01 18:28:08 +00:00
120 lines
2.8 KiB
C
120 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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#include "standalone_driver.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.id, GIT_OID_RAWSZ, &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_indexer_name(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_indexer_name(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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