fuzzer-unserializehash.c

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/*
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | https://www.php.net/license/3_01.txt                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
 */
 
 
#include "fuzzer.h"
 
#include "Zend/zend.h"
#include <main/php_config.h>
#include "main/php_main.h"
 
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
 
#include "fuzzer-sapi.h"
 
#include "ext/standard/php_var.h"
 
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t FullSize) {
    const uint8_t *Start = memchr(Data, '|', FullSize);
    if (!Start) {
        return 0;
    }
    ++Start;
 
    if (fuzzer_request_startup() == FAILURE) {
        return 0;
    }
 
    size_t Size = (Data + FullSize) - Start;
    unsigned char *orig_data = malloc(Size+1);
    memcpy(orig_data, Start, Size);
    orig_data[Size] = '\0';
 
    fuzzer_setup_dummy_frame();
 
    {
        const unsigned char *data = orig_data;
        zval result;
        ZVAL_UNDEF(&result);
 
        php_unserialize_data_t var_hash;
        PHP_VAR_UNSERIALIZE_INIT(var_hash);
        php_var_unserialize(&result, (const unsigned char **) &data, data + Size, &var_hash);
        PHP_VAR_UNSERIALIZE_DESTROY(var_hash);
 
        if (Z_TYPE(result) == IS_OBJECT
            && zend_string_equals_literal(Z_OBJCE(result)->name, "HashContext")) {
            zval args[2];
            ZVAL_COPY_VALUE(&args[0], &result);
            ZVAL_STRINGL(&args[1], (char *) Data, (Start - Data) - 1);
            fuzzer_call_php_func_zval("hash_update", 2, args);
            zval_ptr_dtor(&args[1]);
            fuzzer_call_php_func_zval("hash_final", 1, args);
        }
 
        zval_ptr_dtor(&result);
    }
 
    free(orig_data);
 
    fuzzer_request_shutdown();
    return 0;
}
 
int LLVMFuzzerInitialize(int *argc, char ***argv) {
    fuzzer_init_php(NULL);
 
    /* fuzzer_shutdown_php(); */
    return 0;
}