Bug #79108 [NEW]: Referencing argument in a function makes it a reference in the stack trace
From: tux dot jumale at gmail dot com
Operating system: 7.2.26-cli-alpine3.10
PHP version: 7.2.26
Package: *General Issues
Bug Type: Bug
Bug description:Referencing argument in a function makes it a reference in the stack trace
Description:
------------
Taking a reference of an argument makes it also to be a reference in the
stack trace, which allows to modify the value from any nesting level via
'args' key of debug_backtrace
Test script:
---------------
<?php
function test(string $val) {
$a = &$val;
hackingHere();
print_r($val);
}
function hackingHere() {
// we're able to modify the $val from here, even though the arg was
not a reference
debug_backtrace()[1]['args'][0] = 'Modified';
}
test('Original');
Expected result:
----------------
Should print 'Original'
Actual result:
--------------
Prints 'Modified', because hackingHere unexpectedly gets access to the
argument.
--
Edit bug report at https://bugs.php.net/bug.php?id=79108&edit=1
--
Fix committed: https://bugs.php.net/fix.php?id=79108&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=79108&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=79108&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=79108&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=79108&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=79108&r=support
Expected behavior: https://bugs.php.net/fix.php?id=79108&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=79108&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=79108&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=79108&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=79108&r=phptooold
Daylight Savings: https://bugs.php.net/fix.php?id=79108&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=79108&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=79108&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=79108&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=79108&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=79108&r=mysqlcfg
Thread (5 messages)
- tux dot jumale at gmail dot com