[libxml2]Add libxml2 library

2026-07-26 16:57:28 +08:00
parent 0a44ec8a06
commit e841ac915d
3790 changed files with 668244 additions and 0 deletions
@@ -0,0 +1,91 @@
+/*
+ * schema.c: a libFuzzer target to test the XML Schema processor.
+ *
+ * See Copyright for the status of this software.
+ */
+
+#ifndef XML_DEPRECATED
+  #define XML_DEPRECATED
+#endif
+
+#include <libxml/catalog.h>
+#include <libxml/xmlschemas.h>
+#include <libxml/xmlschemastypes.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) {
+    xmlSchemaParserCtxtPtr pctxt;
+    xmlSchemaPtr schema;
+    size_t failurePos;
+
+    if (size > 200000)
+        return(0);
+
+    xmlFuzzDataInit(data, size);
+
+    failurePos = xmlFuzzReadInt(4) % (size + 100);
+
+    xmlFuzzReadEntities();
+
+    xmlFuzzInjectFailure(failurePos);
+    pctxt = xmlSchemaNewParserCtxt(xmlFuzzMainUrl());
+    xmlSchemaSetParserStructuredErrors(pctxt, xmlFuzzSErrorFunc, NULL);
+    xmlSchemaSetResourceLoader(pctxt, xmlFuzzResourceLoader, NULL);
+    schema = xmlSchemaParse(pctxt);
+    xmlSchemaFreeParserCtxt(pctxt);
+
+    if (schema != NULL) {
+        xmlSchemaValidCtxtPtr vctxt;
+        xmlParserCtxtPtr ctxt;
+        xmlDocPtr doc;
+
+        ctxt = xmlNewParserCtxt();
+        xmlCtxtSetErrorHandler(ctxt, xmlFuzzSErrorFunc, NULL);
+        xmlCtxtSetResourceLoader(ctxt, xmlFuzzResourceLoader, NULL);
+        doc = xmlCtxtReadFile(ctxt, xmlFuzzSecondaryUrl(), NULL,
+                              XML_PARSE_NOENT);
+        xmlFreeParserCtxt(ctxt);
+
+        vctxt = xmlSchemaNewValidCtxt(schema);
+        xmlSchemaSetValidStructuredErrors(vctxt, xmlFuzzSErrorFunc, NULL);
+        xmlSchemaValidateDoc(vctxt, doc);
+        xmlSchemaFreeValidCtxt(vctxt);
+
+        xmlFreeDoc(doc);
+        xmlSchemaFree(schema);
+    }
+
+    xmlFuzzInjectFailure(0);
+    xmlFuzzDataCleanup();
+    xmlResetLastError();
+    xmlSchemaCleanupTypes();
+
+    return(0);
+}
+
+size_t
+LLVMFuzzerCustomMutator(char *data, size_t size, size_t maxSize,
+                        unsigned seed) {
+    static const xmlFuzzChunkDesc chunks[] = {
+        { 4, XML_FUZZ_PROB_ONE / 10 }, /* failurePos */
+        { 0, 0 }
+    };
+
+    return xmlFuzzMutateChunks(chunks, data, size, maxSize, seed,
+                               LLVMFuzzerMutate);
+}
+