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https://gitlab.gnome.org/GNOME/libxml2.git
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100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/*
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* xml.c: a libFuzzer target to test several XML parser interfaces.
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*
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* See Copyright for the status of this software.
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*/
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#include <libxml/parser.h>
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#include <libxml/tree.h>
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#include <libxml/xmlerror.h>
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#include <libxml/xinclude.h>
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#include <libxml/xmlreader.h>
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#include "fuzz.h"
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int
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LLVMFuzzerInitialize(int *argc ATTRIBUTE_UNUSED,
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char ***argv ATTRIBUTE_UNUSED) {
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xmlInitParser();
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xmlSetGenericErrorFunc(NULL, xmlFuzzErrorFunc);
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xmlSetExternalEntityLoader(xmlFuzzEntityLoader);
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return 0;
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}
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int
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LLVMFuzzerTestOneInput(const char *data, size_t size) {
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static const size_t maxChunkSize = 128;
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xmlDocPtr doc;
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xmlParserCtxtPtr ctxt;
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xmlTextReaderPtr reader;
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xmlChar *out;
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const char *docBuffer, *docUrl;
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size_t maxSize, docSize, consumed, chunkSize;
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int opts, outSize;
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xmlFuzzDataInit(data, size);
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opts = xmlFuzzReadInt();
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/* Lower maximum size when processing entities for now. */
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maxSize = opts & XML_PARSE_NOENT ? 50000 : 500000;
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if (size > maxSize)
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goto exit;
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xmlFuzzReadEntities();
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docBuffer = xmlFuzzMainEntity(&docSize);
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docUrl = xmlFuzzMainUrl();
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if (docBuffer == NULL)
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goto exit;
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/* Pull parser */
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doc = xmlReadMemory(docBuffer, docSize, docUrl, NULL, opts);
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if (opts & XML_PARSE_XINCLUDE)
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xmlXIncludeProcessFlags(doc, opts);
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/* Also test the serializer. */
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xmlDocDumpMemory(doc, &out, &outSize);
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xmlFree(out);
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xmlFreeDoc(doc);
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/* Push parser */
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ctxt = xmlCreatePushParserCtxt(NULL, NULL, NULL, 0, docUrl);
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if (ctxt == NULL)
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goto exit;
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xmlCtxtUseOptions(ctxt, opts);
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for (consumed = 0; consumed < docSize; consumed += chunkSize) {
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chunkSize = docSize - consumed;
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if (chunkSize > maxChunkSize)
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chunkSize = maxChunkSize;
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xmlParseChunk(ctxt, docBuffer + consumed, chunkSize, 0);
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}
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xmlParseChunk(ctxt, NULL, 0, 1);
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if (opts & XML_PARSE_XINCLUDE)
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xmlXIncludeProcessFlags(ctxt->myDoc, opts);
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xmlFreeDoc(ctxt->myDoc);
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xmlFreeParserCtxt(ctxt);
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/* Reader */
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reader = xmlReaderForMemory(docBuffer, docSize, NULL, NULL, opts);
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if (reader == NULL)
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goto exit;
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while (xmlTextReaderRead(reader) == 1) {
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if (xmlTextReaderNodeType(reader) == XML_ELEMENT_NODE) {
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int i, n = xmlTextReaderAttributeCount(reader);
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for (i=0; i<n; i++) {
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xmlTextReaderMoveToAttributeNo(reader, i);
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while (xmlTextReaderReadAttributeValue(reader) == 1);
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}
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}
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}
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xmlFreeTextReader(reader);
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exit:
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xmlFuzzDataCleanup();
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return(0);
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}
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