Edit report at https://bugs.php.net/bug.php?id=49664&edit=1
ID: 49664
Comment by: initrd dot gz at gmail dot com
Reported by: patrik dot lermon at gmail dot com
Summary: Clone causes Segmentation fault
Status: Re-Opened
Type: Bug
Package: Reproducible crash
Operating System: Linux
PHP Version: 5.*, 6 (2009-09-20)
Block user comment: N
Private report: N
New Comment:
C lets you do a lot of stuff you aren't supposed to do. Just because C allows
it
doesn't mean higher level languages like PHP should. An out of memory error is
much more helpful than a segfault, which could come from anything. Also,
segfaults
have historically lead to exploits.
Previous Comments:
------------------------------------------------------------------------
[2013-04-06 17:45:36] dinesh dot joshi at yahoo dot com
This segmentation fault / coredump behavior is consistent with what lower level
languages like C. So IMHO this should not be considered a PHP bug. Just don't
get
into infinite recursions. The language can't stop you from doing something
stupid.
Here's a C program that demos the same behavior:
------------------------------
#include<stdio.h>
void fn() {
char buff[16*1024];
fn();
}
int main(void) {
fn();
}
------------------------------
------------------------------------------------------------------------
[2013-02-23 22:58:49] [email protected]
Still present in trunk; reopening.
------------------------------------------------------------------------
[2013-01-28 13:43:17] cf0hay at gmail dot com
Same az OP (with PHP 5.4.8):
$ php a.php
a before cloning:
a: [- >]
Segmentation fault
------------------------------------------------------------------------
[2013-01-23 12:07:28] patrik dot lermon at gmail dot com
And what do you get when you try with the reproduce code?
------------------------------------------------------------------------
[2013-01-23 11:27:55] cf0hay at gmail dot com
> Infinite recursion crashes. There's no fix for that.
Err, what?
$ php -r 'function a(){ a(); } a();'
PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to
allocate 130968 bytes) in Command line code on line 1
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to
allocate
130968 bytes) in Command line code on line 1
This is the intended behaviour on infinite recursion, not a segmentation fault.
I wouldn't be surprised this could lead a security problem rather just a simple
crash.
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