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Nikita Popov
cd4243dde9
This is a basic fuzzer for the function JIT, which looks for crashes and sanitizer violations only, and does not try to detect differing behavior yet.
87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
/*
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+----------------------------------------------------------------------+
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| Copyright (c) The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| https://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Nikita Popov <nikic@php.net> |
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+----------------------------------------------------------------------+
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*/
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#include "fuzzer-execute-common.h"
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#include "zend_exceptions.h"
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static void opcache_invalidate(void) {
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steps_left = MAX_STEPS;
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zend_exception_save();
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zval retval, func, args[2];
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ZVAL_STRING(&func, "opcache_invalidate");
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ZVAL_STRING(&args[0], "/fuzzer.php");
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ZVAL_TRUE(&args[1]);
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call_user_function(CG(function_table), NULL, &func, &retval, 2, args);
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ZEND_ASSERT(Z_TYPE(retval) == IS_TRUE);
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zval_ptr_dtor(&args[0]);
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zval_ptr_dtor(&retval);
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zval_ptr_dtor(&func);
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zend_exception_restore();
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}
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int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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if (Size > MAX_SIZE) {
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/* Large inputs have a large impact on fuzzer performance,
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* but are unlikely to be necessary to reach new codepaths. */
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return 0;
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}
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zend_string *jit_option = zend_string_init("opcache.jit", sizeof("opcache.jit") - 1, 1);
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/* First run without JIT to determine whether we bail out. We should not run JITed code if
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* we bail out here, as the JIT code may loop infinitely. */
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steps_left = MAX_STEPS;
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bailed_out = false;
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zend_alter_ini_entry_chars(
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jit_option, "off", sizeof("off")-1, PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
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fuzzer_do_request_from_buffer(
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"/fuzzer.php", (const char *) Data, Size, /* execute */ 1, opcache_invalidate);
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if (!bailed_out) {
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steps_left = MAX_STEPS;
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zend_alter_ini_entry_chars(jit_option,
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"function", sizeof("function")-1, PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
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fuzzer_do_request_from_buffer(
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"/fuzzer.php", (const char *) Data, Size, /* execute */ 1, opcache_invalidate);
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}
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zend_string_release(jit_option);
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return 0;
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}
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char *get_opcache_path(void) {
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// TODO: Make this more general.
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char *opcache_path = "modules/opcache.so";
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return realpath(opcache_path, NULL);
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}
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int LLVMFuzzerInitialize(int *argc, char ***argv) {
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char *opcache_path = get_opcache_path();
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assert(opcache_path && "Failed to determine opcache path");
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char ini_buf[256];
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snprintf(ini_buf, sizeof(ini_buf),
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"zend_extension=%s\n"
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"opcache.validate_timestamps=0\n"
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"opcache.file_update_protection=0\n"
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"opcache.jit_buffer_size=512M",
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opcache_path);
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free(opcache_path);
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fuzzer_init_php_for_execute(ini_buf);
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return 0;
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}
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