Muqsit

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Muqsit

A ssegmentation fault in PHP is often the cause of a PHP extensions written in C, and more specifically one with a memory management error. However, I have encountered my share of segfaults during network programming, but I pair these with PHP's pthreads extension, so it would explain why. It is also possible to encounter segfaults from infinite recursion, but the root cause is still more or less the same - something weird in memory management.

Step 1: Compile PHP binary with debugging symbols

Below I compile with -g flag to enable PHP's GD extension, -t linux64 because I am running on a Ubuntu server, and -P5 to install PM5's dependencies and the right versions for those dependencies. YMMY. See PHP-Binaries for more flags and info.

git clone https://github.com/pmmp/PHP-Binaries.git
cd PHP-Binaries

Muqsit

<?php

declare(strict_types=1);

/**
 * @name DispenserInvMenuPlugin
 * @main muqsit\dispenserinvmenuplugin\Loader
 * @api 5.0.0
 * @version 0.0.1
 */

Muqsit

Muqsit

<?php

declare(strict_types=1);

function run_python(string $path, string $payload) : ?string{
	$process = proc_open(["/usr/bin/python3", $path], [
		0 => ["pipe", "r"],
		1 => ["pipe", "w"],
		2 => ["pipe", "w"],
	], $pipes);

Muqsit

<?php

declare(strict_types=1);

use pocketmine\nbt\BigEndianNbtSerializer;

$n_runs = 100;

// wget https://gist.githubusercontent.com/Muqsit/08391495f934f5c47be0f837ac2907ab/raw/6d36652ca8b557bbaf96115a846ed25a1e45e7c6/inventory.json
$inventory = file_get_contents("/home/cosmicpe/dev/plugin_data/Scripter/inventory.json");

Muqsit

<?php

declare(strict_types=1);

function apply_destructor_hook(string $contents) : ?string{
	$destructor_body = PHP_EOL;
	$destructor_body .= "echo 'Destroyed ', \$this::class,";
	$destructor_body .= "' (', \spl_object_id(\$this), ')...',";
	$destructor_body .= "\PHP_EOL,";
	$destructor_body .= "(new \Exception)->getTraceAsString(),";

Muqsit

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

Muqsit

<?php

declare(strict_types=1);

use pocketmine\math\AxisAlignedBB;
use pocketmine\math\Facing;
use pocketmine\math\Vector3;
use pocketmine\math\VoxelRayTrace;
use pocketmine\player\Player;
use pocketmine\scheduler\CancelTaskException;

Muqsit

<?php

declare(strict_types=1);

use pocketmine\math\AxisAlignedBB;
use pocketmine\math\Facing;
use pocketmine\math\Vector3;
use pocketmine\player\Player;
use pocketmine\scheduler\CancelTaskException;
use pocketmine\scheduler\ClosureTask;