[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 +1,105 @@
+/*
+ * 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 "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);
+
+    return 0;
+}
+
+int
+LLVMFuzzerTestOneInput(const char *data, size_t size) {
+    xmlParserCtxtPtr ctxt;
+    xmlDocPtr doc;
+    const char *docBuffer, *docUrl;
+    size_t failurePos, docSize;
+    int opts;
+
+    xmlFuzzDataInit(data, size);
+    opts = (int) xmlFuzzReadInt(4);
+    opts &= ~XML_PARSE_DTDVALID &
+            ~XML_PARSE_SAX1;
+    failurePos = xmlFuzzReadInt(4) % (size + 100);
+
+    xmlFuzzReadEntities();
+    docBuffer = xmlFuzzMainEntity(&docSize);
+    docUrl = xmlFuzzMainUrl();
+    if (docBuffer == NULL)
+        goto exit;
+
+    /* Pull parser */
+
+    xmlFuzzInjectFailure(failurePos);
+    ctxt = xmlNewParserCtxt();
+    if (ctxt != NULL) {
+        xmlXIncludeCtxtPtr xinc;
+        xmlDocPtr copy;
+
+        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);
+
+        xinc = xmlXIncludeNewContext(doc);
+        xmlXIncludeSetResourceLoader(xinc, xmlFuzzResourceLoader, NULL);
+        xmlXIncludeSetFlags(xinc, opts);
+        xmlXIncludeProcessNode(xinc, (xmlNodePtr) doc);
+        if (doc != NULL) {
+            xmlFuzzCheckFailureReport("xmlXIncludeProcessNode",
+                    xinc == NULL ||
+                    xmlXIncludeGetLastError(xinc) == XML_ERR_NO_MEMORY,
+                    xinc != NULL &&
+                    xmlXIncludeGetLastError(xinc) == XML_IO_EIO);
+        }
+        xmlXIncludeFreeContext(xinc);
+
+        xmlFuzzResetFailure();
+        copy = xmlCopyDoc(doc, 1);
+        if (doc != NULL)
+            xmlFuzzCheckFailureReport("xmlCopyNode", copy == NULL, 0);
+        xmlFreeDoc(copy);
+
+        xmlFreeDoc(doc);
+        xmlFreeParserCtxt(ctxt);
+    }
+
+exit:
+    xmlFuzzInjectFailure(0);
+    xmlFuzzDataCleanup();
+    xmlResetLastError();
+    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 }, /* opts */
+        { 4, XML_FUZZ_PROB_ONE / 10 }, /* failurePos */
+        { 0, 0 }
+    };
+
+    return xmlFuzzMutateChunks(chunks, data, size, maxSize, seed,
+                               LLVMFuzzerMutate);
+}
+