Bug #80002 [PATCH]: calc free space for new interned string is wrong

From: Date: Thu, 20 Aug 2020 09:25:40 +0000
Subject: Bug #80002 [PATCH]: calc free space for new interned string is wrong
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-228691@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=80002&edit=1

 ID:                 80002
 Patch added by:     cmb@php.net
 Reported by:        t-matsuno at colopl dot co dot jp
 Summary:            calc free space for new interned string is wrong
 Status:             Assigned
 Type:               Bug
 Package:            opcache
 PHP Version:        PHP 7.3
 Assigned To:        cmb
 Block user comment: N
 Private report:     N

 New Comment:

The following pull request has been associated:

Patch Name: Fix #80002: calc free space for new interned string is wrong
On GitHub:  https://github.com/php/php-src/pull/6024
Patch:      https://github.com/php/php-src/pull/6024.patch


Previous Comments:
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[2020-08-20 09:23:56] cmb@php.net

Thanks for reporting, and the patch!

------------------------------------------------------------------------
[2020-08-20 09:09:48] t-matsuno at colopl dot co dot jp

Description:
------------
Hello,

Since I got "Interned string buffer overflow" warning with relatively large
opcache.interned_strings_buffer, I looked ZendAccelerator and tried some tests.
Through the series of tests, it seems that the calculation for free space to keep interned strings
is wrong and it derives the 1/32 smaller value than the actual free space and it causes the overflow
warning for some big strings even if there is enough free space.

I hope you look at it.
This happens in PHP7.3 and newer.

Regards,
Takeki.



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Edit this bug report at https://bugs.php.net/bug.php?id=80002&edit=1

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