C 中的自定义 PHP 扩展中的段错误实例化类

Question

我正在开发自己的 PHP 扩展，其中包含一个类。我最近从 Ubuntu 9.04 升级到 9.10，但扩展损坏了。此后，我尝试更新到 10.04，看看它是否修复了该问题，因为我的开发环境是 10.04，并且它在那里运行良好。与我能理解的唯一主要区别是服务器是 64 位而我的笔记本电脑是 32 位架构。我有 PHP 版本 5.3.2-1ubuntu4.5 (Zend build 20090626)。

我尝试运行我的测试 PHP 文件：

<?php
$server =  "http://localhost/";
$port = 1214;
$f = new PPKeyClient($server, $port);
var_dump($f);

在 GDB 中：

root@node:/etc/php5/conf.d# gdb php
GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
...
Reading symbols from /usr/bin/php...Reading symbols from /usr/lib/debug/usr/bin/php5...done.
done.
(gdb) run -f /var/www/test.php 
Starting program: /usr/bin/php -f /var/www/test.php
[Thread debugging using libthread_db enabled]
[New Thread 0x7fffef15b710 (LWP 9228)]
[Thread 0x7fffef15b710 (LWP 9228) exited]
1
Program received signal SIGSEGV, Segmentation fault.
0x00000000006e7767 in zend_do_fcall_common_helper_SPEC (execute_data=0x7fff00000000)
    at /build/buildd/php5-5.3.2/Zend/zend_vm_execute.h:371
371 /build/buildd/php5-5.3.2/Zend/zend_vm_execute.h: No such file or directory.
 in /build/buildd/php5-5.3.2/Zend/zend_vm_execute.h
(gdb) bt
#0  0x00000000006e7767 in zend_do_fcall_common_helper_SPEC (execute_data=0x7fff00000000)
    at /build/buildd/php5-5.3.2/Zend/zend_vm_execute.h:371
#1  0x00000000006bec20 in execute (op_array=0xfef1b0) at /build/buildd/php5-5.3.2/Zend/zend_vm_execute.h:104
#2  0x000000000069694d in zend_execute_scripts (type=0, retval=0x7fffffffbf90, file_count=3)
    at /build/buildd/php5-5.3.2/Zend/zend.c:1266
#3  0x0000000000642598 in php_execute_script (primary_file=0x2) at /build/buildd/php5-5.3.2/main/main.c:2288
#4  0x0000000000727a56 in main (argc=0, argv=0x1) at /build/buildd/php5-5.3.2/sapi/cli/php_cli.c:1196
(gdb) 

以及扩展中的相关位：

PHP_MINIT_FUNCTION(pp)
{
        // Register PPKeyClient class
        zend_class_entry ce;
        INIT_CLASS_ENTRY(ce, "PPKeyClient", pp_functions);
        PPKeyClient_ce = zend_register_internal_class(&ce TSRMLS_CC);
        PPKeyClient_ce->create_object = PPKeyClient_object_new;
        memcpy(&PPKeyClient_handlers, zend_get_std_object_handlers(), sizeof(zend_object_handlers));
        PPKeyClient_handlers.clone_obj = NULL;
        return SUCCESS;
}

zend_object_value PPKeyClient_object_new(zend_class_entry *ce TSRMLS_DC)
{
        zend_object_value retval;
        PPKeyClient_object *intern;

        // TODO - only instantiate look at
        // http://stackoverflow.com/questions/1906565/php-extension-library-accessing-php-superglobals
        // or google for http://www.google.co.uk/search?hl=en&safe=off&q=superglobals+in+php+extensions&aq=f&aqi=&aql=&oq=&gs_rfai=

        intern = ecalloc(1, sizeof(PPKeyClient_object));
        zend_object_std_init(&(intern->std), ce TSRMLS_CC);
        zend_hash_copy(intern->std.properties, &ce->default_properties, (copy_ctor_func_t) zval_add_ref, NULL, sizeof(zval *));

        intern->last_curl_result = PPKC_NO_REQUEST;

        retval.handle = zend_objects_store_put(intern, PPKeyClient_object_dtor, NULL, NULL TSRMLS_CC);
        retval.handlers = &PPKeyClient_handlers;
        return retval;
}

PHP_METHOD(PPKeyClient, __construct)
{
        PPKeyClient_object *intern;
        char *url, *ssl_ca_crt = NULL;
        int port = 80, url_len, ssl_ca_crt_len = 0, ua_len = 0;

        if(zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|ls", &url, &url_len, &port, &ssl_ca_crt, &ssl_ca_crt_len) == SUCCES$
        {
                intern = (PPKeyClient_object*)zend_object_store_get_object(getThis() TSRMLS_CC);
//              intern->port = port;

//              intern->baseurl = estrndup(url, url_len);
//              intern->baseurl_len = url_len;
//              intern->ssl_ca_crt = estrndup(ssl_ca_crt, ssl_ca_crt_len);
//              intern->ssl_ca_crt_len = ssl_ca_crt_len;
//              intern->useragent = "PP KeyClient (PPExt#" PHP_PRIVATE_PASSWORDS_EXTNAME " v" PHP_PRIVATE_PASSWORDS_VERSION ")";
        }
}

我知道注释 intern = (PPKeyClient_object*)zend_object_store_get_object... 行可以使其工作，但显然我如果没有它，就无法从构造函数中设置值。

我很迷茫，希望能得到任何帮助来了解情况！

Answer 1

我看到一些 Ubuntu 版本安装了 libsafe，如果 Ubuntu 9.04 是这种情况，也许错误总是存在......

这是因为 libsafe 可以“避免”一些缓冲区溢出、双重释放和其他一些错误。

我不熟悉 PHP 扩展... getThis() 是 PHP API 中的函数还是您的函数？如果是你的，你能寄给我吗？

Answer 2

我不记得我是如何解决这个问题的 - 我认为@SlappyTheFish 是对的 - 与 64 位有关。后来我将服务器重新安装为 32 位，我相信问题已经解决，所以本质上问题没有解决，但我解决了它。