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[2020-12-16 03:22 UTC] divinity76 at gmail dot com
Description:
------------
it appears that PHP crash when trying to parse source code above 4GB in size,
notably the code below is not a syntax error if you change it to
$imax = (int)((1*1024*1024*1024)/strlen("'hello',"));
but if you just change the 1* to 4*, it's suddenly a "syntax error",
PS: don't recommend trying this on a system with less than 20GB ram, htop reported over 18GB ram while running..
Test script:
---------------
<?php
$str='<?php return array(';
$imax = (int)((4*1024*1024*1024)/strlen("'hello',"));
echo "generating..";
$str.=str_repeat("'hello',",$imax);
$str.=");";
echo "generated. writing.";
file_put_contents("wtf.php",$str);
echo "written. gcing";
unset($str);gc_collect_cycles(); // << dunno if that actually helps
echo ". done. including.";
require("wtf.php");
Expected result:
----------------
no syntax error
Actual result:
--------------
root@x2ratma:/temp/fag# time php fag.php
generating..generated. writing.written. gcing. done. including.PHP Parse error: syntax error, unexpected ''h' (T_ENCAPSED_AND_WHITESPACE), expecting ')' in /temp/fag/wtf.php on line 1
real 0m24.960s
user 0m4.927s
sys 0m17.147s
root@x2ratma:/temp/fag#
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Last updated: Wed Mar 12 15:01:30 2025 UTC |
@nikic indeed it was; seems about 76GB of ram is needed to test this bug, and the current php-8.1.0-dev is immune :) quote from testing on a 128GB ram system: root@localhost:/temp# /usr/bin/time -v /temp/php-src/sapi/cli/php -r 'ini_set("memory_limit","-1");require("wtf.php");echo "it worked!";var_dump(memory_get_peak_usage(false),memory_get_peak_usage(true),memory_get_usage(false),memory_get_usage(true));' it worked!int(90195052680) int(90230177792) int(391088) int(17223909376) Command being timed: "/temp/php-src/sapi/cli/php -r ini_set("memory_limit","-1");require("wtf.php");echo "it worked!";var_dump(memory_get_peak_usage(false),memory_get_peak_usage(true),memory_get_usage(false),memory_get_usage(true));" User time (seconds): 330.95 System time (seconds): 175.72 Percent of CPU this job got: 96% Elapsed (wall clock) time (h:mm:ss or m:ss): 8:47.20 Average shared text size (kbytes): 0 Average unshared data size (kbytes): 0 Average stack size (kbytes): 0 Average total size (kbytes): 0 Maximum resident set size (kbytes): 75538080 Average resident set size (kbytes): 0 Major (requiring I/O) page faults: 0 Minor (reclaiming a frame) page faults: 48743267 Voluntary context switches: 1 Involuntary context switches: 8120 Swaps: 0 File system inputs: 0 File system outputs: 0 Socket messages sent: 0 Socket messages received: 0 Signals delivered: 0 Page size (bytes): 4096 Exit status: 0 root@localhost:/temp# du -h wtf.php 4.1G wtf.php root@localhost:/temp# head wtf.php <?php return array('hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello','hello',(capped)