mirror of
https://git.proxmox.com/git/libgit2
synced 2025-05-02 17:42:31 +00:00
86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
/*
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* libgit2 commit-graph 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 "common.h"
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#include "str.h"
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#include "futils.h"
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#include "hash.h"
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#include "commit_graph.h"
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#include "standalone_driver.h"
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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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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_commit_graph_file file = {{0}};
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git_commit_graph_entry e;
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git_str commit_graph_buf = GIT_STR_INIT;
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unsigned char hash[GIT_HASH_SHA1_SIZE];
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git_oid oid = GIT_OID_NONE;
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bool append_hash = false;
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if (size < 4)
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return 0;
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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 file is somewhat valid.
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*/
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append_hash = *data & 0x80;
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/* Keep a 4-byte alignment to avoid unaligned accesses. */
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data += 4;
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size -= 4;
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if (append_hash) {
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if (git_str_init(&commit_graph_buf, size + GIT_HASH_SHA1_SIZE) < 0)
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goto cleanup;
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if (git_hash_buf(hash, data, size, GIT_HASH_ALGORITHM_SHA1) < 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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memcpy(commit_graph_buf.ptr, data, size);
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memcpy(commit_graph_buf.ptr + size, hash, GIT_HASH_SHA1_SIZE);
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memcpy(oid.id, hash, GIT_OID_SHA1_SIZE);
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} else {
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git_str_attach_notowned(&commit_graph_buf, (char *)data, size);
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}
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if (git_commit_graph_file_parse(
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&file,
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(const unsigned char *)git_str_cstr(&commit_graph_buf),
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git_str_len(&commit_graph_buf))
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< 0)
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goto cleanup;
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/* Search for any oid, just to exercise that codepath. */
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if (git_commit_graph_entry_find(&e, &file, &oid, GIT_OID_SHA1_HEXSIZE) < 0)
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goto cleanup;
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cleanup:
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git_commit_graph_file_close(&file);
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git_str_dispose(&commit_graph_buf);
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return 0;
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}
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