1 /*
2 +----------------------------------------------------------------------+
3 | Copyright (c) The PHP Group |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | https://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Authors: Nikita Popov <nikic@php.net> |
14 +----------------------------------------------------------------------+
15 */
16
17 #include "fuzzer-execute-common.h"
18
LLVMFuzzerTestOneInput(const uint8_t * Data,size_t Size)19 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
20 if (Size > MAX_SIZE) {
21 /* Large inputs have a large impact on fuzzer performance,
22 * but are unlikely to be necessary to reach new codepaths. */
23 return 0;
24 }
25
26 zend_string *jit_option = ZSTR_INIT_LITERAL("opcache.jit", 1);
27
28 /* First run without JIT to determine whether we bail out. We should not run JITed code if
29 * we bail out here, as the JIT code may loop infinitely. */
30 steps_left = MAX_STEPS;
31 bailed_out = false;
32 zend_alter_ini_entry_chars(
33 jit_option, "off", sizeof("off")-1, PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
34 fuzzer_do_request_from_buffer(
35 FILE_NAME, (const char *) Data, Size, /* execute */ 1, opcache_invalidate);
36
37 if (!bailed_out) {
38 steps_left = MAX_STEPS;
39 zend_alter_ini_entry_chars(jit_option,
40 "function", sizeof("function")-1, PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
41 zend_execute_ex = orig_execute_ex;
42 fuzzer_do_request_from_buffer(
43 FILE_NAME, (const char *) Data, Size, /* execute */ 1, opcache_invalidate);
44 zend_execute_ex = fuzzer_execute_ex;
45 }
46
47 zend_string_release(jit_option);
48
49 return 0;
50 }
51
LLVMFuzzerInitialize(int * argc,char *** argv)52 int LLVMFuzzerInitialize(int *argc, char ***argv) {
53 char *opcache_path = get_opcache_path();
54 assert(opcache_path && "Failed to determine opcache path");
55
56 char ini_buf[512];
57 snprintf(ini_buf, sizeof(ini_buf),
58 "zend_extension=%s\n"
59 "opcache.validate_timestamps=0\n"
60 "opcache.file_update_protection=0\n"
61 "opcache.jit_buffer_size=256M",
62 opcache_path);
63 free(opcache_path);
64
65 create_file();
66 fuzzer_init_php_for_execute(ini_buf);
67 return 0;
68 }
69
