1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/*
* valid.c: a libFuzzer target to test DTD validation.
*
* See Copyright for the status of this software.
*/
#include <libxml/catalog.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/xmlerror.h>
#include <libxml/xmlreader.h>
#include "fuzz.h"
int
LLVMFuzzerInitialize(int *argc ATTRIBUTE_UNUSED,
char ***argv ATTRIBUTE_UNUSED) {
xmlFuzzMemSetup();
xmlInitParser();
#ifdef LIBXML_CATALOG_ENABLED
xmlInitializeCatalog();
#endif
xmlSetGenericErrorFunc(NULL, xmlFuzzErrorFunc);
xmlSetExternalEntityLoader(xmlFuzzEntityLoader);
return 0;
}
int
LLVMFuzzerTestOneInput(const char *data, size_t size) {
static const size_t maxChunkSize = 128;
xmlDocPtr doc;
xmlParserCtxtPtr ctxt;
xmlValidCtxtPtr vctxt;
xmlTextReaderPtr reader;
const char *docBuffer, *docUrl;
size_t maxAlloc, docSize, consumed, chunkSize;
int opts;
xmlFuzzDataInit(data, size);
opts = (int) xmlFuzzReadInt(4);
opts &= ~XML_PARSE_XINCLUDE;
opts |= XML_PARSE_DTDVALID;
maxAlloc = xmlFuzzReadInt(4) % (size + 1);
xmlFuzzReadEntities();
docBuffer = xmlFuzzMainEntity(&docSize);
docUrl = xmlFuzzMainUrl();
if (docBuffer == NULL)
goto exit;
/* Pull parser */
xmlFuzzMemSetLimit(maxAlloc);
doc = xmlReadMemory(docBuffer, docSize, docUrl, NULL, opts);
xmlFreeDoc(doc);
/* Post validation */
xmlFuzzMemSetLimit(maxAlloc);
doc = xmlReadMemory(docBuffer, docSize, docUrl, NULL, opts & ~XML_PARSE_DTDVALID);
vctxt = xmlNewValidCtxt();
xmlValidateDocument(vctxt, doc);
xmlFreeValidCtxt(vctxt);
xmlFreeDoc(doc);
/* Push parser */
xmlFuzzMemSetLimit(maxAlloc);
ctxt = xmlCreatePushParserCtxt(NULL, NULL, NULL, 0, docUrl);
if (ctxt == NULL)
goto exit;
xmlCtxtUseOptions(ctxt, opts);
for (consumed = 0; consumed < docSize; consumed += chunkSize) {
chunkSize = docSize - consumed;
if (chunkSize > maxChunkSize)
chunkSize = maxChunkSize;
xmlParseChunk(ctxt, docBuffer + consumed, chunkSize, 0);
}
xmlParseChunk(ctxt, NULL, 0, 1);
xmlFreeDoc(ctxt->myDoc);
xmlFreeParserCtxt(ctxt);
/* Reader */
xmlFuzzMemSetLimit(maxAlloc);
reader = xmlReaderForMemory(docBuffer, docSize, NULL, NULL, opts);
if (reader == NULL)
goto exit;
while (xmlTextReaderRead(reader) == 1) {
if (xmlTextReaderNodeType(reader) == XML_ELEMENT_NODE) {
int i, n = xmlTextReaderAttributeCount(reader);
for (i=0; i<n; i++) {
xmlTextReaderMoveToAttributeNo(reader, i);
while (xmlTextReaderReadAttributeValue(reader) == 1);
}
}
}
xmlFreeTextReader(reader);
exit:
xmlFuzzMemSetLimit(0);
xmlFuzzDataCleanup();
xmlResetLastError();
return(0);
}
|
