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Bug #67174 cli/TSRM/tsrm_virtual_cwd.c:578 - Program received signal SIGSEGV
Submitted: 2014-05-01 23:07 UTC Modified: 2017-07-30 04:22 UTC
Votes:3
Avg. Score:4.3 ± 0.9
Reproduced:2 of 2 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: beber at meleeweb dot net Assigned:
Status: No Feedback Package: Reproducible crash
PHP Version: 5.4.27 OS: Gentoo GNU/Linux
Private report: No CVE-ID: None
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 [2014-05-01 23:07 UTC] beber at meleeweb dot net
Description:
------------
I'm getting a SIGSEGV using the following php :

# php -v
PHP 5.4.27-pl0-gentoo (cli) (built: May  2 2014 00:33:46) (DEBUG)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies

Build options :

./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --prefix=/usr/lib64/php5.4 --mandir=/usr/lib64/php5.4/man --infodir=/usr/lib64/php5.4/info --libdir=/usr/lib64/php5.4/lib --with-libdir=lib64 --without-pear --disable-maintainer-zts --disable-bcmath --with-bz2=/usr --disable-calendar --enable-ctype --with-curl=/usr --without-curlwrappers --enable-dom --without-enchant --enable-exif --enable-fileinfo --enable-filter --disable-ftp --without-gettext --without-gmp --enable-hash --without-mhash --with-iconv --disable-intl --enable-ipv6 --enable-json --without-kerberos --enable-libxml --with-libxml-dir=/usr --enable-mbstring --with-mcrypt=/usr --without-mssql --with-onig=/usr --with-openssl=/usr --with-openssl-dir=/usr --enable-pcntl --enable-phar --enable-pdo --without-pgsql --enable-posix --without-pspell --without-recode --enable-simplexml --disable-shmop --without-snmp --disable-soap --disable-sockets --with-sqlite3=/usr --without-sybase-ct --disable-sysvmsg --disable-sysvsem --disable-sysvshm --without-fpm-systemd --without-tidy --enable-tokenizer --disable-wddx --enable-xml --enable-xmlreader --enable-xmlwriter --with-xmlrpc --with-xsl=/usr --disable-zip --with-zlib=/usr --enable-debug --without-cdb --without-db4 --disable-flatfile --without-gdbm --disable-inifile --without-qdbm --with-freetype-dir=/usr --with-t1lib=/usr --disable-gd-jis-conv --with-jpeg-dir=/usr --with-png-dir=/usr --without-xpm-dir --with-gd --with-mysql=mysqlnd --with-mysql-sock=/var/run/mysqld/mysqld.sock --with-mysqli=mysqlnd --without-pdo-dblib --with-pdo-mysql=mysqlnd --without-pdo-pgsql --with-pdo-sqlite=/usr --without-pdo-odbc --with-readline=/usr --without-libedit --without-mm --with-pic --with-pcre-regex=/usr --with-pcre-dir=/usr --with-config-file-path=/etc/php/cli-php5.4 --with-config-file-scan-dir=/etc/php/cli-php5.4/ext-active --disable-embed --enable-cli --disable-cgi --disable-fpm --without-apxs2

Using drupal 7.23, 7.x-1.5 entity module.

Program received signal SIGSEGV, Segmentation fault.
0x0000555555a5b673 in realpath_cache_key (path=<error reading variable: Cannot access memory at address 0x7fffff7feff8>,
    path_len=<error reading variable: Cannot access memory at address 0x7fffff7feff4>)
    at /usr/src/debug/dev-lang/php-5.4.27/sapis-build/cli/TSRM/tsrm_virtual_cwd.c:578
578     {
#0  0x0000555555a5b673 in realpath_cache_key (path=<error reading variable: Cannot access memory at address 0x7fffff7feff8>,
    path_len=<error reading variable: Cannot access memory at address 0x7fffff7feff4>)
    at /usr/src/debug/dev-lang/php-5.4.27/sapis-build/cli/TSRM/tsrm_virtual_cwd.c:578
        h = 44424
        e = 0x0


Expected result:
----------------
I should expect a 'Allowed memory size exhausted' or another error, but a SEGV.

Actual result:
--------------
Full backtrace can be found here (25MB) : http://people.meleeweb.net/~beber/triskel/wwwdev.gdb.txt

This is reproducible using apache or cli SAPI with php 5.4.27 and 5.5.10

I seems that an infinite loop is present that lead to memory exhausting. gdb backtrace has 48350 frames.

# grep '^#' gdb.txt | awk '{print $4}' | sort | uniq -c | sort -bg
      1 ZEND_INCLUDE_OR_EVAL_SPEC_CV_HANDLER
      1 do_cli
      1 main
      1 phar_find_in_include_path
      1 phar_resolve_path
      1 php_execute_script
      1 php_resolve_path
      1 php_resolve_path_for_zend
      1 realpath_cache_find
      1 realpath_cache_key
      1 tsrm_realpath
      1 virtual_file_ex
      1 zend_execute_scripts
      2 tsrm_realpath_r
   9667 ZEND_DO_FCALL_SPEC_CONST_HANDLER
   9667 zend_call_function
   9667 zend_do_fcall_common_helper_SPEC
   9667 zif_call_user_func_array
   9668 execute

# grep '^#' gdb.txt | awk '{if ($6 == "at") {print $7}}' | sort | uniq -c | sort -bg
      1 /usr/src/debug/dev-lang/php-5.4.27/sapis-build/cli/main/main.c:2502
   9668 /usr/src/debug/dev-lang/php-5.4.27/sapis-build/cli/Zend/zend_vm_execute.h:410

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 [2017-07-23 02:06 UTC] kalle@php.net
-Status: Open +Status: Feedback
 [2017-07-23 02:06 UTC] kalle@php.net
Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves. 

A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external 
resources such as databases, etc. If the script requires a 
database to demonstrate the issue, please make sure it creates 
all necessary tables, stored procedures etc.

Please avoid embedding huge scripts into the report.


 [2017-07-30 04:22 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 
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