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Bug #15308 Segfault when the string which contains '_' in session name is specified.
Submitted: 2002-01-31 03:06 UTC Modified: 2002-02-02 22:22 UTC
From: lasttom at ra2 dot so-net dot ne dot jp Assigned:
Status: Closed Package: Session related
PHP Version: 4.2.0-dev OS: any
Private report: No CVE-ID: None
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From: lasttom at ra2 dot so-net dot ne dot jp
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 [2002-01-31 03:06 UTC] lasttom at ra2 dot so-net dot ne dot jp 
Apache child segfault when the string which contains '_' in session name is specified.
Although tried on Red Hat7.2 and Windows2000, the apache child segfault.

php.ini
session.save_handler=files

<?php
    session_id ("_index");
    session_start ();
    $_SESSION["foo"]   = "bar";
?>

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 [2002-01-31 03:30 UTC] mfischer@php.net 
Does this also happen with 4.1.1 and if, please provide a backtrace under unix (provided that you compiled both php and apache with debug symbols).
 [2002-01-31 04:57 UTC] yohgaki@php.net 
Thank you for responding, Markus.
I asked this user to submit bug report in Japanese PHP mail list.

I think I know what's wrong, but I don't have enough time create and test patch...

In mod_files.c it tests session id file chars are [0-9a-zA-Z], if not it returns 0. It seems returning false is causing this. In mod_user.c and session_pgsql.c, there is very simlar problem. Returning false for read causes segfault. 

The reason for these segfaults are the same, I guess. 
(i.e. session.c has problem when read returns false)
 [2002-02-02 22:22 UTC] yohgaki@php.net 
This bug has been fixed in CVS.
 
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