1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include "conf-parser.h"
4 #include "fd-util.h"
5 #include "fuzz.h"
6 #include "install.h"
7 #include "load-fragment.h"
8 #include "manager-dump.h"
9 #include "string-util.h"
10 #include "unit-serialize.h"
11 #include "utf8.h"
12
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)13 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
14 _cleanup_free_ char *out = NULL; /* out should be freed after g */
15 size_t out_size;
16 _cleanup_fclose_ FILE *f = NULL, *g = NULL;
17 _cleanup_free_ char *p = NULL;
18 UnitType t;
19 _cleanup_(manager_freep) Manager *m = NULL;
20 Unit *u;
21 const char *name;
22 long offset;
23
24 if (outside_size_range(size, 0, 65536))
25 return 0;
26
27 f = data_to_file(data, size);
28
29 assert_se(f);
30
31 if (read_line(f, LINE_MAX, &p) < 0)
32 return 0;
33
34 t = unit_type_from_string(p);
35 if (t < 0)
36 return 0;
37
38 if (!unit_vtable[t]->load)
39 return 0;
40
41 offset = ftell(f);
42 assert_se(offset >= 0);
43
44 for (;;) {
45 _cleanup_free_ char *l = NULL;
46 const char *ll;
47
48 if (read_line(f, LONG_LINE_MAX, &l) <= 0)
49 break;
50
51 ll = startswith(l, UTF8_BYTE_ORDER_MARK) ?: l;
52 ll = ll + strspn(ll, WHITESPACE);
53
54 if (HAS_FEATURE_MEMORY_SANITIZER && startswith(ll, "ListenNetlink")) {
55 /* ListenNetlink causes a false positive in msan,
56 * let's skip this for now. */
57 log_notice("Skipping test because ListenNetlink= is present");
58 return 0;
59 }
60 }
61
62 assert_se(fseek(f, offset, SEEK_SET) == 0);
63
64 /* We don't want to fill the logs with messages about parse errors.
65 * Disable most logging if not running standalone */
66 if (!getenv("SYSTEMD_LOG_LEVEL"))
67 log_set_max_level(LOG_CRIT);
68
69 assert_se(manager_new(LOOKUP_SCOPE_SYSTEM, MANAGER_TEST_RUN_MINIMAL, &m) >= 0);
70
71 name = strjoina("a.", unit_type_to_string(t));
72 assert_se(unit_new_for_name(m, unit_vtable[t]->object_size, name, &u) >= 0);
73
74 (void) config_parse(
75 name, name, f,
76 UNIT_VTABLE(u)->sections,
77 config_item_perf_lookup, load_fragment_gperf_lookup,
78 0,
79 u,
80 NULL);
81
82 g = open_memstream_unlocked(&out, &out_size);
83 assert_se(g);
84
85 unit_dump(u, g, "");
86 manager_dump(m, g, ">>>");
87
88 return 0;
89 }
90