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Add fuzzer for tracing jit

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This commit is contained in:
Nikita Popov 2021-09-21 15:26:04 +02:00
parent e69fb48ea3
commit 06a25c774d
6 changed files with 117 additions and 27 deletions
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64
sapi/fuzzer/fuzzer-function-jit.c Normal file
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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. |
+----------------------------------------------------------------------+
| Authors: Nikita Popov <nikic@php.net> |
+----------------------------------------------------------------------+
*/
#include "fuzzer-execute-common.h"
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
if (Size > MAX_SIZE) {
/* Large inputs have a large impact on fuzzer performance,
* but are unlikely to be necessary to reach new codepaths. */
return 0;
}
zend_string *jit_option = zend_string_init("opcache.jit", sizeof("opcache.jit") - 1, 1);
/* First run without JIT to determine whether we bail out. We should not run JITed code if
* we bail out here, as the JIT code may loop infinitely. */
steps_left = MAX_STEPS;
bailed_out = false;
zend_alter_ini_entry_chars(
jit_option, "off", sizeof("off")-1, PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
fuzzer_do_request_from_buffer(
"/fuzzer.php", (const char *) Data, Size, /* execute */ 1, opcache_invalidate);
if (!bailed_out) {
steps_left = MAX_STEPS;
zend_alter_ini_entry_chars(jit_option,
"function", sizeof("function")-1, PHP_INI_USER, PHP_INI_STAGE_RUNTIME);
fuzzer_do_request_from_buffer(
"/fuzzer.php", (const char *) Data, Size, /* execute */ 1, opcache_invalidate);
}
zend_string_release(jit_option);
return 0;
}
int LLVMFuzzerInitialize(int *argc, char ***argv) {
char *opcache_path = get_opcache_path();
assert(opcache_path && "Failed to determine opcache path");
char ini_buf[256];
snprintf(ini_buf, sizeof(ini_buf),
"zend_extension=%s\n"
"opcache.validate_timestamps=0\n"
"opcache.file_update_protection=0\n"
"opcache.jit_buffer_size=256M",
opcache_path);
free(opcache_path);
fuzzer_init_php_for_execute(ini_buf);
return 0;
}