Edit report at https://bugs.php.net/bug.php?id=49664&edit=1
ID: 49664
Comment by: cf0hay at gmail dot com
Reported by: patrik dot lermon at gmail dot com
Summary: Clone causes Segmentation fault
Status: Not a bug
Type: Bug
Package: Reproducible crash
Operating System: Linux
PHP Version: 5.*, 6 (2009-09-20)
Block user comment: N
Private report: N
New Comment:
> 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.
Previous Comments:
------------------------------------------------------------------------
[2012-12-18 23:53:05] kurt at kurtrose dot com
Python handles this kind of recursion fine:
class F(object):
def __repr__(self): return self.__repr__()
>>> repr(F())
File "<stdin>", line 2, in __repr__
File "<stdin>", line 2, in __repr__
...
File "<stdin>", line 2, in __repr__
File "<stdin>", line 2, in __repr__
RuntimeError: maximum recursion depth exceeded
No segfault.
------------------------------------------------------------------------
[2009-10-19 15:31:17] patrik dot lermon at gmail dot com
I don't agree. Perhaps my knowledge is not detailed enough, but an infinte
recursion should:
a) run out of memory and die, or
b) detect the recursion and die.
In both these cases PHP should die in a controlled manner, not segfault.
My understanding is that segfault is never ok - that means the code is faulty.
------------------------------------------------------------------------
[2009-10-19 15:10:24] [email protected]
Infinite recursion crashes. There's no fix for that.
------------------------------------------------------------------------
[2009-09-28 12:06:43] patrik dot lermon at gmail dot com
I get the same result with http://snaps.php.net/php5.3-latest.tar.gz
on Slackware.
------------------------------------------------------------------------
[2009-09-25 07:50:31] patrik dot lermon at gmail dot com
I am aware that the cloning will be recursive in some circumstances, but PHP
should not segfault because of this.
------------------------------------------------------------------------
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