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/dev/mem: Operation not permitted [message #35550]

Thu, 02 April 2009 21:58

bbhenry
Messages: 17
Registered: February 2009

Junior Member

I have an application trying to access the /dev/mem and get the following error:
/dev/mem: Operation not permitted

I have already grand access of the /dev/mem to my container with both of the method I found on the wiki, even though I can see the device being available in my container , but I still get the permission denied error message. Here are the 2 methods I tried

vzctl set 2005 --devnodes mem:rw --save

or
2005 device config file with the following setting:
DEVICES="c:1:1:rw"

Both of them was able to create a /dev/mem inside my container, but I just can't get permission to access it. By the way, I am able to access the /dev/mem from HN using:
cat /dev/mem

but when I do the same thing in container, I get operation not permitted

I am using Centos 5.2 on HN, with OpenVZ kernel 2.6.18-92.1.18.el5.028stab060.2

I also have a question about mknod, what's the difference when /dev is created from mknod and device being passed by vzctl set 2005 --devnodes?

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[Message index]

		/dev/mem: Operation not permitted By: bbhenry on Thu, 02 April 2009 21:58
		Re: /dev/mem: Operation not permitted By: maratrus on Fri, 03 April 2009 06:05
		Re: /dev/mem: Operation not permitted By: bbhenry on Fri, 03 April 2009 16:30
		Re: /dev/mem: Operation not permitted By: maratrus on Fri, 03 April 2009 16:36
		Re: /dev/mem: Operation not permitted SOLVED By: bbhenry on Fri, 03 April 2009 17:13

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