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Bug #77708 FFI Segfaults when using Closure::fromCallable
Submitted: 2019-03-07 14:43 UTC Modified: 2019-03-24 04:22 UTC
From: ircmaxell@php.net Assigned: dmitry (profile)
Status: No Feedback Package: Unknown/Other Function
PHP Version: Next Minor Version OS: linux
Private report: No CVE-ID: None
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 [2019-03-07 14:43 UTC] ircmaxell@php.net
Description:
------------
When attempting to create a closure from an FFI function, it results in a segfault  when trying to call the closure.

Test script:
---------------
<?php

$header = '
int printf(const char*, ...);

';

$ffi = FFI::cdef($header, 'libc.so.6');

$cb = Closure::fromCallable([$ffi, 'printf']);

$cb("Hello World\n");

Expected result:
----------------
Hello World

Actual result:
--------------
Program received signal SIGSEGV, Segmentation fault.
0x0000555555ae0c0d in zend_closure_call_magic (execute_data=0x7ffff3a13180, return_value=0x7ffff3a13100) at /.../Zend/zend_closures.c:249
249                     EX(func)->internal_function.scope->__callstatic : EX(func)->internal_function.scope->__call;


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 [2019-03-07 14:43 UTC] ircmaxell@php.net
-Assigned To: +Assigned To: dmitry
 [2019-03-11 12:46 UTC] dmitry@php.net
-Status: Assigned +Status: Feedback
 [2019-03-11 12:46 UTC] dmitry@php.net
The crash is fixed.
However, Closure::fromCallable() can not create closure for FFI function and throws exception instead.
 [2019-03-24 04:22 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 
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