Shared object and php - 'cannot restore segment prot after reloc: Permission denied'

[Dheeraj Joshi]

i have a shared object (.so) as example.so

In my php file when i try to call a function myfun() which is in example.so

I get a name look up error.. I gave the extensions properly in php.ini..

my code is

<?php
include("example.php")
 
$num=example::myfun();
 
echo "$num;
 

[Dheeraj Joshi]

Look up error is gone.. Its fine now. But a new error.

Warning: dl(): Unable to load dynamic library './example.so' - ./example.so: cannot restore segment prot after reloc: Permission denied in /root/example.php on line 22

Fatal error: Call to undefined functionmyfun() in /root/myfile.php on line 4

I place these .so files in /root

and in php.ini i gave extension as /root/example.so.

We can place .so anywhere and give extension in php.ini file right?

Or should we place in specific locations?

[Dormilich]

it looks like you don't have access to root's home directory (which would make sense). place the file somewhere with public access (like php's directory (something like /usr/bin or /var or /opt ...) otherwise you have to modify permission rights.

[Dheeraj Joshi]

Right now i am logged in as root.

And your meaning of permission means?

Regards
Dheeraj Joshi

[Dormilich]

@dheerajjoshim
isn't that risky?

well, I guess it's PHP (resp. its process) that needs access permission then. (therefore I recommended PHP's directory)

@dheerajjoshim
file system permission

[Dheeraj Joshi]

Hey Dormilich i got the root cause of the problem.

My security policy was not allowing me to create a shared library.

When i disabled it, It is working.

[Dormilich]

if you use __autoload() then you may indeed don't need it, though.

[Dheeraj Joshi]

I am trying to call a C function via PHP. So will __autoload( ) does that?

I think it won't work for 2 different languages.? Or will it work?

[Dormilich]

@dheerajjoshim
wouldn't that usually work via shell command?

[Dheeraj Joshi]

It work's. But it was according to some specifications.So we had to take that route.

By the way, i observer strange thing. I am able to create .so file and call it in PYTHON.

Problem is coming only in PHP. Why?

[Dormilich]

@dheerajjoshim
beats me, I've no idea.

[Dheeraj Joshi]

Even I don't have an idea. I am searching Internet, to get a answer. But it is strange behavior.

[Markus]

Get an answer for what? You just said it was working.

[Markus]

For any others experiencing this problem, this seems to be a common problem/fix.

[Dheeraj Joshi]

I am able to create a shared object and call the functions in PYTHON. But when i try to do it via PHP, I need to disable security policies of LINUX.

Why it works for one language and not for other.?

[Dormilich]

maybe the processes' groups have different rights?

[Dheeraj Joshi]

May be....

But it is an interesting issue. Need to know more about it.