[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 +1,139 @@
+/*
+ * valid.c: a libFuzzer target to test DTD validation.
+ *
+ * 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 "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;
+
+    xmlFuzzDataInit(data, size);
+    opts = (int) xmlFuzzReadInt(4);
+    opts |= XML_PARSE_DTDVALID;
+    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) {
+        xmlCtxtSetErrorHandler(ctxt, xmlFuzzSErrorFunc, NULL);
+        xmlCtxtSetResourceLoader(ctxt, xmlFuzzResourceLoader, NULL);
+        doc = xmlCtxtReadMemory(ctxt, docBuffer, docSize, docUrl, NULL, opts);
+        xmlFuzzCheckFailureReport("xmlCtxtReadMemory",
+                                  ctxt->errNo == XML_ERR_NO_MEMORY,
+                                  ctxt->errNo == XML_IO_EIO);
+        xmlFreeDoc(doc);
+        xmlFreeParserCtxt(ctxt);
+    }
+
+    /* Post validation */
+
+    xmlFuzzInjectFailure(failurePos);
+    ctxt = xmlNewParserCtxt();
+    if (ctxt != NULL) {
+        xmlCtxtSetErrorHandler(ctxt, xmlFuzzSErrorFunc, NULL);
+        xmlCtxtSetResourceLoader(ctxt, xmlFuzzResourceLoader, NULL);
+        doc = xmlCtxtReadMemory(ctxt, docBuffer, docSize, docUrl, NULL,
+                                opts & ~XML_PARSE_DTDVALID);
+        xmlFuzzCheckFailureReport("xmlCtxtReadMemory",
+                doc == NULL && ctxt->errNo == XML_ERR_NO_MEMORY,
+                doc == NULL && ctxt->errNo == XML_IO_EIO);
+        if (doc != NULL) {
+            int valid = xmlCtxtValidateDocument(ctxt, doc);
+
+            xmlFuzzCheckFailureReport("xmlCtxtValidateDocument",
+                    !valid && ctxt->errNo == XML_ERR_NO_MEMORY,
+                    !valid && ctxt->errNo == XML_IO_EIO);
+        }
+        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);
+}
+
+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);
+}
+