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Request #42196 unserialize artichecture problem
Submitted: 2007-08-03 09:51 UTC Modified: 2013-08-06 07:56 UTC
Votes:1
Avg. Score:1.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: joungkyun at gmail dot com Assigned: yohgaki (profile)
Status: Closed Package: *General Issues
PHP Version: 5CVS-2007-08-03 (CVS) OS: Linux
Private report: No CVE-ID: None
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 [2007-08-03 09:51 UTC] joungkyun at gmail dot com 
Description:
------------
There is serialized data that made with 64bit integer on 64 bit system.

On 32bit machine, if unserialize this data, you have result of integer overflow.


Reproduce code:
---------------
On, 64bit system

echo serialize (4294967296 + 1);

=> result : "i:4294967297;"

On, 32bit system

echo unserilaize ("i:4294967297;");

=> result : 1

Expected result:
----------------
On, 32bit system

echo unserilaize ("i:4294967297;");

=> result : 4294967297

Actual result:
--------------
On, 32bit system

echo unserilaize ("i:4294967297;");

=> result : 1

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 [2007-08-04 14:08 UTC] jani@php.net 
First of all, exactly why do you pass data like this between machines?
Secondly: OF course you can't pass huge integers to 32bit system. So 
this is expected behaviour. What do you suggest happens in this case?

Try this on 32bit system: 

echo (int) 4294967297;
 [2007-08-04 16:42 UTC] joungkyun at gmail dot com 
I thinks that php has auto casting type. So, on 32bit systems php get 64bit interger, first convert casting type to double.

sorry for my pool english.
 [2013-08-06 07:56 UTC] yohgaki@php.net
-Status: Open +Status: Closed -Package: Feature/Change Request +Package: *General Issues -Assigned To: +Assigned To: yohgaki
 [2013-08-06 07:56 UTC] yohgaki@php.net 
Already implemented at least 5.4
 
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