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/*
* xml.c: a libFuzzer target to test several XML parser interfaces.
*
* 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/xmlsave.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
return 0;
}
int
LLVMFuzzerTestOneInput(const char *data, size_t size) {
xmlParserCtxtPtr ctxt;
xmlDocPtr doc;
const char *docBuffer, *docUrl;
size_t failurePos, docSize;
int opts;
#ifdef LIBXML_OUTPUT_ENABLED
const char *saveEncoding;
int saveOpts;
#endif
xmlFuzzDataInit(data, size);
opts = (int) xmlFuzzReadInt(4);
/*
* Disable options that are known to cause timeouts
*/
opts &= ~XML_PARSE_XINCLUDE &
~XML_PARSE_DTDVALID &
~XML_PARSE_SAX1;
failurePos = xmlFuzzReadInt(4) % (size + 100);
#ifdef LIBXML_OUTPUT_ENABLED
/* TODO: Take from fuzz data */
saveOpts = 0;
saveEncoding = NULL;
#endif
xmlFuzzReadEntities();
docBuffer = xmlFuzzMainEntity(&docSize);
docUrl = xmlFuzzMainUrl();
if (docBuffer == NULL)
goto exit;
/* Pull parser */
xmlFuzzInjectFailure(failurePos);
ctxt = xmlNewParserCtxt();
if (ctxt != NULL) {
xmlCtxtSetErrorHandler(ctxt, xmlFuzzSErrorFunc, NULL);
xmlCtxtSetResourceLoader(ctxt, xmlFuzzResourceLoader, NULL);
doc = xmlCtxtReadMemory(ctxt, docBuffer, docSize, docUrl, NULL, opts);
xmlFuzzCheckFailureReport("xmlCtxtReadMemory",
doc == NULL && ctxt->errNo == XML_ERR_NO_MEMORY,
doc == NULL && ctxt->errNo == XML_IO_EIO);
if (doc != NULL) {
#ifdef LIBXML_OUTPUT_ENABLED
xmlSaveCtxtPtr save;
/* Also test the serializer. */
save = xmlSaveToIO(xmlFuzzOutputWrite, xmlFuzzOutputClose, NULL,
saveEncoding, saveOpts);
if (save != NULL) {
int errNo;
xmlSaveDoc(save, doc);
errNo = xmlSaveFinish(save);
xmlFuzzCheckFailureReport("xmlSaveDoc",
errNo == XML_ERR_NO_MEMORY,
errNo == XML_IO_EIO);
}
#endif
xmlFreeDoc(doc);
}
xmlFreeParserCtxt(ctxt);
}
/* Push parser */
#ifdef LIBXML_PUSH_ENABLED
{
static const size_t maxChunkSize = 128;
size_t consumed, chunkSize;
xmlFuzzInjectFailure(failurePos);
/*
* FIXME: xmlCreatePushParserCtxt can still report OOM errors
* to stderr.
*/
xmlSetGenericErrorFunc(NULL, xmlFuzzErrorFunc);
ctxt = xmlCreatePushParserCtxt(NULL, NULL, NULL, 0, docUrl);
xmlSetGenericErrorFunc(NULL, NULL);
if (ctxt != NULL) {
xmlCtxtSetErrorHandler(ctxt, xmlFuzzSErrorFunc, NULL);
xmlCtxtSetResourceLoader(ctxt, xmlFuzzResourceLoader, NULL);
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);
xmlFuzzCheckFailureReport("xmlParseChunk",
ctxt->errNo == XML_ERR_NO_MEMORY,
ctxt->errNo == XML_IO_EIO);
xmlFreeDoc(ctxt->myDoc);
xmlFreeParserCtxt(ctxt);
}
}
#endif
exit:
xmlFuzzInjectFailure(0);
xmlFuzzDataCleanup();
xmlResetLastError();
return(0);
}
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