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Commit | Line | Data |
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c25aa7cd PP |
1 | /* |
2 | * libgit2 commit-graph 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 | ||
c25aa7cd | 14 | #include "common.h" |
e579e0f7 | 15 | #include "str.h" |
c25aa7cd PP |
16 | #include "futils.h" |
17 | #include "hash.h" | |
18 | #include "commit_graph.h" | |
19 | ||
e579e0f7 MB |
20 | #include "standalone_driver.h" |
21 | ||
c25aa7cd PP |
22 | int LLVMFuzzerInitialize(int *argc, char ***argv) |
23 | { | |
24 | GIT_UNUSED(argc); | |
25 | GIT_UNUSED(argv); | |
26 | ||
27 | if (git_libgit2_init() < 0) { | |
28 | fprintf(stderr, "Failed to initialize libgit2\n"); | |
29 | abort(); | |
30 | } | |
31 | return 0; | |
32 | } | |
33 | ||
34 | int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) | |
35 | { | |
36 | git_commit_graph_file file = {{0}}; | |
37 | git_commit_graph_entry e; | |
e579e0f7 MB |
38 | git_str commit_graph_buf = GIT_STR_INIT; |
39 | unsigned char hash[GIT_HASH_SHA1_SIZE]; | |
c25aa7cd PP |
40 | git_oid oid = {{0}}; |
41 | bool append_hash = false; | |
42 | ||
43 | if (size < 4) | |
44 | return 0; | |
45 | ||
46 | /* | |
47 | * If the first byte in the stream has the high bit set, append the | |
48 | * SHA1 hash so that the file is somewhat valid. | |
49 | */ | |
50 | append_hash = *data & 0x80; | |
51 | /* Keep a 4-byte alignment to avoid unaligned accesses. */ | |
52 | data += 4; | |
53 | size -= 4; | |
54 | ||
55 | if (append_hash) { | |
e579e0f7 | 56 | if (git_str_init(&commit_graph_buf, size + GIT_HASH_SHA1_SIZE) < 0) |
c25aa7cd | 57 | goto cleanup; |
e579e0f7 | 58 | if (git_hash_buf(hash, data, size, GIT_HASH_ALGORITHM_SHA1) < 0) { |
c25aa7cd PP |
59 | fprintf(stderr, "Failed to compute the SHA1 hash\n"); |
60 | abort(); | |
61 | } | |
62 | memcpy(commit_graph_buf.ptr, data, size); | |
e579e0f7 MB |
63 | memcpy(commit_graph_buf.ptr + size, hash, GIT_HASH_SHA1_SIZE); |
64 | ||
65 | memcpy(oid.id, hash, GIT_OID_RAWSZ); | |
c25aa7cd | 66 | } else { |
e579e0f7 | 67 | git_str_attach_notowned(&commit_graph_buf, (char *)data, size); |
c25aa7cd PP |
68 | } |
69 | ||
70 | if (git_commit_graph_file_parse( | |
71 | &file, | |
e579e0f7 MB |
72 | (const unsigned char *)git_str_cstr(&commit_graph_buf), |
73 | git_str_len(&commit_graph_buf)) | |
c25aa7cd PP |
74 | < 0) |
75 | goto cleanup; | |
76 | ||
77 | /* Search for any oid, just to exercise that codepath. */ | |
78 | if (git_commit_graph_entry_find(&e, &file, &oid, GIT_OID_HEXSZ) < 0) | |
79 | goto cleanup; | |
80 | ||
81 | cleanup: | |
82 | git_commit_graph_file_close(&file); | |
e579e0f7 | 83 | git_str_dispose(&commit_graph_buf); |
c25aa7cd PP |
84 | return 0; |
85 | } |