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6f1470a5d6
Always limit nested functions calls to 5000. This avoids call stack overflows with deeply nested expressions. The expression parser produces about 10 nested function calls when parsing a subexpression in parentheses, so the effective nesting limit is about 500 which should be more than enough. Use a lower limit when fuzzing to account for increased memory usage when using sanitizers.
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/*
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* xpath.c: a libFuzzer target to test XPath and XPointer expressions.
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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/xpointer.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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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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xmlDocPtr doc;
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const char *expr, *xml;
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size_t exprSize, xmlSize;
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xmlFuzzDataInit(data, size);
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expr = xmlFuzzReadString(&exprSize);
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xml = xmlFuzzReadString(&xmlSize);
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/* Recovery mode allows more input to be fuzzed. */
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doc = xmlReadMemory(xml, xmlSize, NULL, NULL, XML_PARSE_RECOVER);
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if (doc != NULL) {
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xmlXPathContextPtr xpctxt = xmlXPathNewContext(doc);
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/* Operation limit to avoid timeout */
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xpctxt->opLimit = 500000;
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xmlXPathFreeObject(xmlXPtrEval(BAD_CAST expr, xpctxt));
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xmlXPathFreeContext(xpctxt);
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}
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xmlFreeDoc(doc);
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xmlFuzzDataCleanup();
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return(0);
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}
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