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Bug #81426 Regression in finfo_open
Submitted: 2021-09-08 21:24 UTC Modified: 2021-09-11 13:17 UTC
From: weierophinney@php.net Assigned: ab (profile)
Status: Not a bug Package: Filesystem function related
PHP Version: 8.1.0RC1 OS: Ubuntu 20.04
Private report: No CVE-ID: None
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 [2021-09-08 21:24 UTC] weierophinney@php.net 
Description:
------------
When supplying a MAGIC file to finfo_open, valid MAGIC files that were parsed correctly in PHP 7.3 - 8.0 now result in parse errors within the finfo extension.

An example of a MAGIC file that was working previously: https://raw.githubusercontent.com/laminas/laminas-validator/2.15.x/test/File/_files/magic.7.mime

The above file has been used in unit tests since the 5.6 series without issue; we only began seeing the issues when attempting to test against PHP 8.1rc1.

Test script:
---------------
$finfo = finfo_open(FILEINFO_MIME_TYPE, 'magic.7.mime'); // file referenced in Description section
echo finfo_file($finfo, 'plain.txt'); // assuming plain.txt is a text file

Expected result:
----------------
text/plain; charset=us-ascii

Actual result:
--------------
PHP Warning:  finfo_open(): Unparsable number `a                \b C.S0050-0 V1.0' in php shell code on line 1

Warning: finfo_open(): Unparsable number `a             \b C.S0050-0 V1.0' in php shell code on line 1
PHP Warning:  finfo_open(): Unparsable number `b                \b C.S0050-0-A V1.0.0' in php shell code on line 1

Warning: finfo_open(): Unparsable number `b             \b C.S0050-0-A V1.0.0' in php shell code on line 1
PHP Warning:  finfo_open(): Unparsable number `c                \b C.S0050-0-B V1.0' in php shell code on line 1

Warning: finfo_open(): Unparsable number `c             \b C.S0050-0-B V1.0' in php shell code on line 1
PHP Warning:  finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1

Warning: finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1
PHP Warning:  finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1

Warning: finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1
PHP Warning:  finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1

Warning: finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1
PHP Warning:  finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1

Warning: finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1
PHP Warning:  finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1

Warning: finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1
PHP Warning:  finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1

Warning: finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1
PHP Warning:  finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1

Warning: finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1
PHP Warning:  finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1

Warning: finfo_open(): Unparsable number `\b, contains[@0x%x]: ' in php shell code on line 1
PHP Warning:  finfo_open(): Unparsable number `\b: ' in php shell code on line 1

Warning: finfo_open(): Unparsable number `\b: ' in php shell code on line 1
PHP Warning:  finfo_open(): Overflow for numeric type `leshort' value 0x223e9f78 in php shell code on line 1

Warning: finfo_open(): Overflow for numeric type `leshort' value 0x223e9f78 in php shell code on line 1
PHP Warning:  finfo_open(): `name       pgpkey' entries can only be declared at top level in php shell code on line 1

Warning: finfo_open(): `name    pgpkey' entries can only be declared at top level in php shell code on line 1
PHP Warning:  finfo_open(): Unparsable number `\b number=%d' in php shell code on line 1

Warning: finfo_open(): Unparsable number `\b number=%d' in php shell code on line 1
PHP Warning:  finfo_open(): Failed to load magic database at "magic.7.mime" in php shell code on line 1

Warning: finfo_open(): Failed to load magic database at "magic.7.mime" in php shell code on line 1

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 [2021-09-08 23:04 UTC] ramsey@php.net 
I did a little digging around to see where this issue might have been introduced. We ported libmagic to 5.40 in 8.1, and I wonder if this might have introduced a regression: https://github.com/php/php-src/commit/3b9173dc8f3bda99e87003f6b6b2a16fa25c1b72
 [2021-09-08 23:15 UTC] ramsey@php.net
-Assigned To: +Assigned To: ab
 [2021-09-11 13:17 UTC] ab@php.net
-Status: Assigned +Status: Not a bug
 [2021-09-11 13:17 UTC] ab@php.net 
Thanks for the report and further investigation. There are no guarantees on the magic data format compatibility whatsoever. A general recommendation is to omit usage of an external magic data.

Thanks
 
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