#48506 [NEW]: upcoming apr closes descriptors by default
From: arekm at maven dot pl
Operating system:
PHP version: 5.2.9
PHP Bug Type: Feature/Change Request
Bug description: upcoming apr closes descriptors by default
Description:
------------
Upcoming apr 2.0.0 (or 1.3 with backported patch) uses O_CLOEXEC for own
descriptors by default.
This means that when using shell_exec() the run script/binary has no
stdin/stdout/stderr due to O_CLOEXEC. This also means that if any output is
produced then script ends with EPIPE.
Tested with apache + apr 1.3 with backported patch.
http://svn.apache.org/viewvc/apr/apr/trunk/CHANGES?r1=747357&r2=748988
Reproduce code:
---------------
<?php
echo shell_exec("LC_ALL=C strace -o /tmp/WYNIK -f -F -s 200 ls -l
/notexistingfile");
?>
Run from apache + php + apr 1.3 + backported O_CLOEXEC patch like this one
http://cvs.pld-linux.org/cgi-bin/cvsweb/packages/apr/apr-bug-46425.patch?rev=1.8
Expected result:
----------------
run "ls -l" and produce some output about file not existing
Actual result:
--------------
30120 lstat("/notexistingfile", 0x18f55f0) = -1 ENOENT (No such file or
directory)
30120 write(2, "ls: ", 4) = -1 EBADF (Bad file descriptor)
30120 write(2, "cannot access /notexistingfile", 30) = -1 EBADF (Bad file
descriptor)
30120 write(2, ": No such file or directory", 27) = -1 EBADF (Bad file
descriptor)
30120 write(2, "\n", 1) = -1 EBADF (Bad file descriptor)
30120 close(1) = 0
30120 close(2) = -1 EBADF (Bad file descriptor)
30120 exit_group(2)
As you can see there is no file descriptor 2 and this means that ls output
is lost.
Probably the best for php is to always provide own descriptors without
relying on apache provided one.
--
Edit bug report at http://bugs.php.net/?id=48506&edit=1
--
Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=48506&r=trysnapshot52
Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=48506&r=trysnapshot53
Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=48506&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=48506&r=fixedcvs
Fixed in CVS and need be documented: http://bugs.php.net/fix.php?id=48506&r=needdocs
Fixed in release: http://bugs.php.net/fix.php?id=48506&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=48506&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=48506&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=48506&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=48506&r=support
Expected behavior: http://bugs.php.net/fix.php?id=48506&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=48506&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=48506&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=48506&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=48506&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=48506&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=48506&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=48506&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=48506&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=48506&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=48506&r=mysqlcfg
Thread (7 messages)
- arekm at maven dot pl