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Bug #77360 class_uses causes segfault
Submitted: 2018-12-27 14:15 UTC Modified: 2018-12-27 14:30 UTC
From: lauri dot kentta at gmail dot com Assigned: nikic (profile)
Status: Closed Package: SPL related
PHP Version: 7.3.0 OS: Linux
Private report: No CVE-ID: None
 [2018-12-27 14:15 UTC] lauri dot kentta at gmail dot com
Description:
------------
Similar to bug #77359, the function spl_find_ce_by_name has use-after-free of a zend_string and causes segfault. This affects functions class_parents, class_implements and class_uses. This bug is caused by commit 084c17fe0b68d391467fd48a14433443d4fcba81.

Test script:
---------------
<?php
$a = md5(""); # Create a non-interned string.
@class_uses($a, false); # Invalid free.
@class_uses($a, false); # Use after free.
echo "{$a} + foo\n"; # Use after free.
# Notice how "foo" is not printed even if the code does not crash.
# Run it a few times to get a crash.
?>

Expected result:
----------------
No crash and full output.

Actual result:
--------------
Crash or truncated output.

Patches

0001-Fix-77360-class_uses-causes-segfault.txt (last revision 2018-12-27 14:17 UTC by lauri dot kentta at gmail dot com)

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2018-12-27 14:30 UTC] nikic@php.net
-Assigned To: +Assigned To: nikic
 [2018-12-27 14:34 UTC] nikic@php.net
Automatic comment on behalf of lauri.kentta@gmail.com
Revision: http://git.php.net/?p=php-src.git;a=commit;h=16c62a81795c253724a957d32e242545bb05253d
Log: Fix #77360: class_uses causes segfault
 [2018-12-27 14:34 UTC] nikic@php.net
-Status: Assigned +Status: Closed
 [2019-01-07 12:05 UTC] cmb@php.net
Automatic comment on behalf of lauri.kentta@gmail.com
Revision: http://git.php.net/?p=php-src.git;a=commit;h=f45ed833d1c7b08c868c0dc6847611e2b79bb65e
Log: Fix #77360: class_uses causes segfault
 
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