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mirror of https://gitlab.gnome.org/GNOME/libxml2.git synced 2024-12-24 21:33:51 +03:00
libxml2/fuzz/xinclude.c
Nick Wellnhofer 30d839776a fuzz: Disable catalogs
The catalogs API doesn't report OOM errors. It's basically impossible
to use it safely in its current form.
2024-01-04 15:18:14 +01:00

115 lines
3.1 KiB
C

/*
* xinclude.c: a libFuzzer target to test the XInclude engine.
*
* 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/xinclude.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();
xmlCatalogSetDefaults(XML_CATA_ALLOW_NONE);
#endif
xmlSetGenericErrorFunc(NULL, xmlFuzzErrorFunc);
xmlSetExternalEntityLoader(xmlFuzzEntityLoader);
return 0;
}
int
LLVMFuzzerTestOneInput(const char *data, size_t size) {
xmlParserCtxtPtr ctxt;
xmlDocPtr doc;
const char *docBuffer, *docUrl;
size_t maxAlloc, docSize;
int opts;
xmlFuzzDataInit(data, size);
opts = (int) xmlFuzzReadInt(4);
opts |= XML_PARSE_XINCLUDE;
maxAlloc = xmlFuzzReadInt(4) % (size + 100);
xmlFuzzReadEntities();
docBuffer = xmlFuzzMainEntity(&docSize);
docUrl = xmlFuzzMainUrl();
if (docBuffer == NULL)
goto exit;
/* Pull parser */
xmlFuzzMemSetLimit(maxAlloc);
ctxt = xmlNewParserCtxt();
if (ctxt != NULL) {
xmlXIncludeCtxtPtr xinc;
xmlDocPtr copy;
doc = xmlCtxtReadMemory(ctxt, docBuffer, docSize, docUrl, NULL, opts);
xmlFuzzCheckMallocFailure("xmlCtxtReadMemory",
ctxt->errNo == XML_ERR_NO_MEMORY);
xmlFuzzResetMallocFailed();
xinc = xmlXIncludeNewContext(doc);
xmlXIncludeSetFlags(xinc, opts);
xmlXIncludeProcessNode(xinc, (xmlNodePtr) doc);
if (doc != NULL) {
xmlFuzzCheckMallocFailure("xmlXIncludeProcessNode",
xinc == NULL ||
xmlXIncludeGetLastError(xinc) == XML_ERR_NO_MEMORY);
}
xmlXIncludeFreeContext(xinc);
xmlFuzzResetMallocFailed();
copy = xmlCopyDoc(doc, 1);
if (doc != NULL)
xmlFuzzCheckMallocFailure("xmlCopyNode", copy == NULL);
xmlFreeDoc(copy);
xmlFreeDoc(doc);
xmlFreeParserCtxt(ctxt);
}
/* Reader */
#ifdef LIBXML_READER_ENABLED
{
xmlTextReaderPtr reader;
int j;
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);
}
}
}
for (j = 0; j < 10; j++)
xmlTextReaderRead(reader);
xmlFreeTextReader(reader);
}
#endif
exit:
xmlFuzzMemSetLimit(0);
xmlFuzzDataCleanup();
xmlResetLastError();
return(0);
}