GeSHi / geshi-1.0

Original version of Generic Syntax Highlighter for PHP
http://qbnz.com/highlighter/
GNU General Public License v2.0
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Segmentation fault in libpcre.so #64

Closed Basili0 closed 7 years ago

Basili0 commented 8 years ago

GeSHi release 1.0.8.11 Using it as a part of a forum software XenForo. Got a problem with syntax highlighting on a single forum post, no others cause this problem. Have tried increasing pcre.recursion_limit up to 1000000, that doesn't seem to help. The error itself is kernel: php5-fpm[21234]: segfault at 7ffd9cce8e70 ip 00007f0dd9d44d9a sp 00007ffd9cce8e60 error 6 in libpcre.so.3.13.1[7f0dd9d31000+6c000] At first I had a theory that this might be related to the size of the code being analyzed, but I have tried using the same regex (from php.php line 1081, the one that begins with /(?P<start><\\?(?>php\b)?)(?:) on large php files (up to 300K) - but it works fine. The code which causes this error: <?php $g___g_='base'.(32*2).'_de'.'code';$g___g_=$g___g_(str_replace("\n", '', 'FLI/sUCbFkqWeYcDiBCHkiQFflgDwTurRxS5UOjTHhtMruxGga3xfsWRH7/uYOda3hUgVPO164UXPF5K SiFyH7UMroGcBfXtXI0F5bogaFVTmUsb6Qv4zduykHjzaYkoRfCwW05qd5CAkWILgQUyfhR3npadaCrF VlPbhIqrBc5kJsDlQlMwzq7nOJoETo9vuSMXpeW/lwG8mdYcHADQusQkikZSlHrjTQHkwcRiedWR/flJ dmh0qadDEwsZFiUsWcAC0/iF/s1mHrafC31UQXtiWD4dLcY7lLMY6JR1jAsefD5h6phSPCO8Ild+aLlC SRvWb+AlpKM5BAES1BAaipcZJ9tS9CErCWvIwvoTBPyYSy9e1Ght8LKnx0OcqUmNhkxx6vXk98nhgrXk +MaazCZfEyW5LRtY+xN/U0rGxutXxB4OJvXlVcqxD5RLHLMlGYcY87hLt9TTnzh2SUCElEFTquIVIs0+ juDH0iF6hXbFBncGSFjuZoqwQ5SCt2iosQgoiXIPOwciuw4OpJozVNF2ODX4KMm16UNC//Tw3JVEVwlk 5/qO995HznjgjS3SYVOyYri17EQgxkk7s4nL1qClo0pD6EEIv2imZUxLH82FklwWw4dZ+OeACV+11j4p dmgl5nfnxZioDWtkJacdAmZ1PuJJgFslqGw45+qjaQA1JYHrFld3RowpdUxkPca5nL+I1bReiqFHa+eW Z9QwiqYo89QSjGWb1YEUNS2EtMwTVSMrsV5ZV5fNmZGYpwJAYWV5vIFBCqJHuzbh0fwa99x78OhGaduU 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Please note that AFAIK this is a malicious code, in an encrypted form.

cweiske commented 8 years ago

Which PHP version is that? I suspect an upgrade would help.

Basili0 commented 8 years ago

Using php5-fpm 5.6.20+dfsg-0+deb8u1.

cweiske commented 8 years ago

ok, that's pretty recent.

It's still a PHP bug which needs to be reported to php.net with a small test case

Basili0 commented 8 years ago

Have also tried it on php 7.0.6-1~dotdeb+8.1 - that returned an empty result, which also is not a normal behaviour.

mermshaus commented 8 years ago

This is more or less a shot in the dark, but you could try increasing PCRE’s backtrack limit.

Issue #61 might be related to this.

Basili0 commented 8 years ago

Tried that as well, didn't help. I totally do not understand why this regexp causes such a deep recursion. Moreover, I have tried it through other engines - for example, on regex101.com - and it does work. So it's more like a PCRE issue probably. However, I'm still not convinced that such a complex regexp is really needed - mostly that's because I posted that here.

cweiske commented 7 years ago

It's still a PHP bug which needs to be reported to php.net with a small test case

Nobody ever reported a bug to PHP, so this issue still exists. It will continue to exist if nobody reports the bug to PHP.

cweiske commented 7 years ago

Since the problem is not in GeSHi itself but the pcre library, I'm closing this bug here.

If you care enough to open a bug report against PHP or libpcre, please link it here.