mirror of
https://git.proxmox.com/git/libgit2
synced 2025-11-04 14:08:17 +00:00
77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
/*
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* libgit2 multi-pack-index 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 "buffer.h"
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#include "common.h"
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#include "futils.h"
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#include "hash.h"
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#include "midx.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_midx_file idx = {{0}};
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git_midx_entry e;
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git_buf midx_buf = GIT_BUF_INIT;
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git_oid oid = {{0}};
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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 packfile 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_buf_init(&midx_buf, size + sizeof(oid)) < 0)
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goto cleanup;
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if (git_hash_buf(&oid, data, size) < 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(midx_buf.ptr, data, size);
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memcpy(midx_buf.ptr + size, &oid, sizeof(oid));
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} else {
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git_buf_attach_notowned(&midx_buf, (char *)data, size);
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}
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if (git_midx_parse(&idx, (const unsigned char *)git_buf_cstr(&midx_buf), git_buf_len(&midx_buf)) < 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_midx_entry_find(&e, &idx, &oid, GIT_OID_HEXSZ) < 0)
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goto cleanup;
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cleanup:
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git_midx_close(&idx);
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git_buf_dispose(&midx_buf);
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return 0;
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}
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