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From Laurent Genier <...@intrinsec.com>
Subject apache-api/6889: SEGV of httpd when using a re-entrant upload script
Date Sat, 25 Nov 2000 18:09:51 GMT

>Number:         6889
>Category:       apache-api
>Synopsis:       SEGV of httpd when using a re-entrant upload script
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    apache
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Sat Nov 25 10:10:01 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     lgr@intrinsec.com
>Release:        1.3.14
>Organization:
apache
>Environment:
Linux 2.2.14-5.0 intel
>Description:
This bug seems to be the same than number #6792.

When using a script called "foo.php3" for uploading a file on a web server,
if this script calls itself for parsing the uploaded file, httpd has SEGV.

Program received signal SIGSEGV, Segmentation fault.
0x4024ecbd in XS_Apache__URI_password () from /etc/httpd.other/modules/libperl.so
(gdb) where
#0  0x4024ecbd in XS_Apache__URI_password () from /etc/httpd.other/modules/libperl.so
#1  0x402a2008 in Perl_pp_dbmopen () from /etc/httpd.other/modules/libperl.so
#2  0x4025103c in XS_Apache__Server_port () from /etc/httpd.other/modules/libperl.so
#3  0x4025170e in XS_Apache__File_new () from /etc/httpd.other/modules/libperl.so
[...]

When using it from a .html page "test_segv.html" to a .php3 script "test_segv.php3" (same
name, but different extensions), 
a SEGV occurs :

Program received signal SIGSEGV, Segmentation fault.
0x0 in ?? ()
(gdb) where
#0  0x0 in ?? ()
#1  0x40225d20 in ?? () from /etc/httpd.other/modules/libperl.so
#2  0x4024f02a in XS_Apache__URI_query () from /etc/httpd.other/modules/libperl.so
#3  0x4025103c in XS_Apache__Server_port () from /etc/httpd.other/modules/libperl.so
#4  0x4025170e in XS_Apache__File_new () from /etc/httpd.other/modules/libperl.so
#5  0x40246516 in XS_Apache_subprocess_env () from /etc/httpd.other/modules/libperl.so
#6  0x402747e4 in study_chunk () from /etc/httpd.other/modules/libperl.so



When calling it with a CGI, and without setting php3 on, a broken pipe appears :
rogram received signal SIGPIPE, Broken pipe.
0x40146af4 in __libc_write () from /lib/libc.so.6
(gdb) where
#0  0x40146af4 in __libc_write () from /lib/libc.so.6
#1  0x404b9854 in dummy_lsub () from /usr/lib/apache/imap.so
#2  0x806b160 in ap_hook_call ()
#3  0x806adec in ap_hook_call ()
#4  0x8051d53 in ap_bspawn_child ()
#5  0x805278b in ap_bfilbuf ()
>How-To-Repeat:
Use this script, put it in a file called "test_segv.php3" :
<HTML>
<BODY>
 <FORM ENCTYPE="multipart/form-data" ACTION="test_segv.php3" METHOD=POST>
  <INPUT NAME="order_file" TYPE="file"> 
  <INPUT NAME="DOWNLOAD" TYPE="submit" VALUE="TÚlÚcharger les ordres">
 </FORM>
</BODY>
</HTML>

Try to launch it, when you call it for the upload, httpd SEGV.
I've tried it with a .php3 and a .cgi. Using .cgi has a differenc behaviour,
httpd has broken pipe.
>Fix:
Don't use a re-entrant script, use two differents scripts
>Release-Note:
>Audit-Trail:
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