Permission denied as root

Question

The root user of Linux doesn't have permission to read/write a regular file, unless all users have permission to read/write this file, like below:

drwxrwsrwx ....... file_name

However the owner of the file can still read/write this file.

AND:

0) not the problem of execution, just read/write
1) not the problem of device because regular user can read/write it.
2) the result of command id:

uid=0(root) gid=0(root) groups=0(root)

so I don't think it's the problem of group.

So what other problems could be?

Kirby Todd · Answer 1 · 2011-03-23 06:57:45Z

up vote 2 down vote

Is this filesystem on an NFS export?

answered Mar 23 '11 at 6:57

Kirby Todd

yes, I guess it maybe the problem of NFS. Thx a lot – owen_water Mar 23 '11 at 7:38

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Philipp T. · Answer 2 · 2011-03-23 06:53:57Z

up vote 1 down vote

Is the file on an NFS exported without "no_root_squash"? Are you running SELinux? (id -Z and ls -Z gives more information)

answered Mar 23 '11 at 6:53

	yes, I'm using NFS. I can't see the configuration file of NFS now because I don't have permission, but it probably uses `root_squash` since `no_root_squash` seems not safe. – owen_water Mar 23 '11 at 7:32
	and no, not SELinux `id: --context (-Z) works only on an SELinux-enabled kernel` – owen_water Mar 23 '11 at 7:33

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migrated from stackoverflow.com Mar 23 '11 at 11:23