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Bug #21095 symlink and chroot
Submitted: 2002-12-19 06:11 UTC Modified: 2002-12-29 14:32 UTC
From: busia at tiscali dot it Assigned:
Status: Wont fix Package: Filesystem function related
PHP Version: 4.3.0RC3 OS: Redhat 7.2
Private report: No CVE-ID: None
View Developer Edit
 [2002-12-19 06:11 UTC] busia at tiscali dot it 
if I use

<?
chdir("/home/foo_alfa");
symlinks("../foo", "bar");
?>

the symlink that is created in /home/foo_alfa is 
bar -> /home/foo

ant not
bar -> ../foo

how expected

this is a problem because I use chroot jails for ftp and the file became not accessible.

Andrea Busia

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 [2002-12-19 18:43 UTC] iliaa@php.net 
Are you using PHP with thread safety enabled?
 [2002-12-20 06:10 UTC] busia at tiscali dot it 
Yes I use php with thread safe enabled, I'm using Apache 2.0.43 with worker MPM.
 [2002-12-29 14:32 UTC] iliaa@php.net 
Because in thread safe mode PHP does not actually change directories making a symlink on relative paths will often fail if any chdir() calls are found inside the script. Therefor when ZTS is used symlinks are always done on FULL paths.
 
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