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Commit | Line | Data |
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22a2d3d5 UG |
1 | /* |
2 | * libgit2 multi-pack-index fuzzer target. | |
3 | * | |
4 | * Copyright (C) the libgit2 contributors. All rights reserved. | |
5 | * | |
6 | * This file is part of libgit2, distributed under the GNU GPL v2 with | |
7 | * a Linking Exception. For full terms see the included COPYING file. | |
8 | */ | |
9 | ||
10 | #include <stdio.h> | |
11 | ||
12 | #include "git2.h" | |
13 | ||
22a2d3d5 UG |
14 | #include "common.h" |
15 | #include "futils.h" | |
16 | #include "hash.h" | |
17 | #include "midx.h" | |
18 | ||
e579e0f7 MB |
19 | #include "standalone_driver.h" |
20 | ||
22a2d3d5 UG |
21 | int LLVMFuzzerInitialize(int *argc, char ***argv) |
22 | { | |
23 | GIT_UNUSED(argc); | |
24 | GIT_UNUSED(argv); | |
25 | ||
26 | if (git_libgit2_init() < 0) { | |
27 | fprintf(stderr, "Failed to initialize libgit2\n"); | |
28 | abort(); | |
29 | } | |
30 | return 0; | |
31 | } | |
32 | ||
33 | int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) | |
34 | { | |
35 | git_midx_file idx = {{0}}; | |
36 | git_midx_entry e; | |
e579e0f7 MB |
37 | git_str midx_buf = GIT_STR_INIT; |
38 | unsigned char hash[GIT_HASH_SHA1_SIZE]; | |
22a2d3d5 UG |
39 | git_oid oid = {{0}}; |
40 | bool append_hash = false; | |
41 | ||
42 | if (size < 4) | |
43 | return 0; | |
44 | ||
45 | /* | |
46 | * If the first byte in the stream has the high bit set, append the | |
47 | * SHA1 hash so that the packfile is somewhat valid. | |
48 | */ | |
49 | append_hash = *data & 0x80; | |
50 | /* Keep a 4-byte alignment to avoid unaligned accesses. */ | |
51 | data += 4; | |
52 | size -= 4; | |
53 | ||
54 | if (append_hash) { | |
e579e0f7 | 55 | if (git_str_init(&midx_buf, size + GIT_HASH_SHA1_SIZE) < 0) |
22a2d3d5 | 56 | goto cleanup; |
e579e0f7 | 57 | if (git_hash_buf(hash, data, size, GIT_HASH_ALGORITHM_SHA1) < 0) { |
22a2d3d5 UG |
58 | fprintf(stderr, "Failed to compute the SHA1 hash\n"); |
59 | abort(); | |
60 | } | |
61 | memcpy(midx_buf.ptr, data, size); | |
e579e0f7 MB |
62 | memcpy(midx_buf.ptr + size, hash, GIT_HASH_SHA1_SIZE); |
63 | ||
64 | memcpy(oid.id, hash, GIT_OID_RAWSZ); | |
22a2d3d5 | 65 | } else { |
e579e0f7 | 66 | git_str_attach_notowned(&midx_buf, (char *)data, size); |
22a2d3d5 UG |
67 | } |
68 | ||
e579e0f7 | 69 | if (git_midx_parse(&idx, (const unsigned char *)git_str_cstr(&midx_buf), git_str_len(&midx_buf)) < 0) |
22a2d3d5 UG |
70 | goto cleanup; |
71 | ||
72 | /* Search for any oid, just to exercise that codepath. */ | |
73 | if (git_midx_entry_find(&e, &idx, &oid, GIT_OID_HEXSZ) < 0) | |
74 | goto cleanup; | |
75 | ||
76 | cleanup: | |
77 | git_midx_close(&idx); | |
e579e0f7 | 78 | git_str_dispose(&midx_buf); |
22a2d3d5 UG |
79 | return 0; |
80 | } |