Details from Fujitsu:
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RHN System ID:

Customer Contact Name:

Ishikawa Yoshitaka

Description of Problem:

Server Kernel returns NFS4_OK when an ordinary user opening a file which he owns and permission is set to 000
On any other file systems (ext3, ext4, nfsv3 etc.), an ordinary user can not open a file which permission is set to 000 even if he is the owner of the file.
So, on NFSv4 fs, when an ordinary user opening a file which he owns and permission is set to 000, kernel should return an error NFS4ERR_ACCESS rather than NFS4_OK.

Version-Release number of selected component:

Red Hat Enterprise Linux Version Number: RHEL4
Release Number:    4.8 snapshot5
Architecture:      x86_64
Kernel Version:    kernel-2.6.9-88.EL
Related Package Version:    none
Related Middleware / Application:    none

Drivers or hardware or architecture dependency:

None

How reproducible:

Every time

Step to Reproduce:

Server Settings:
  # cat /etc/exports
  /tmp *(rw,insecure,fsid=0,root_squash)

Client:
  Execute following commands to reproduce (root is treated as a ordinary
  user because the server export the fs with option 'root_squash'.):

  Step1:mount the nfsv4 fs and enter the mount dir
      # mount -t nfs4 [server]:/ /mnt/ && cd /mnt/
  Step2:creat the test file
      # echo "test" > test
  Step3:change the test file permission to 000
      # chmod 000 test
  Step4:cat the test file
      # cat test

Actual Results:

The file content is displayed.

$ cat test
test

Expected Results:

"Permission denied" is outputted.

$ cat test
cat: test: Permission denied

Summary of actions taken to resolve issue:

None

Location of diagnostic data:

None

Hardware configuration:

Model:       PRIMERGY TX150 S5
CPU Info:    Intel(R) Xeon(R) CPU   3040  @ 1.86GHz
Memory Info: 6GB

Business Impact:

None
Target Release: 4.9
Errata Request: No
Hotfix Request: No
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Additional Info:
* I was able to reproduce the problem.
* RHEL5 Bug 502244 - 'r' and 'w' permission for user do not work on NFSv4 client
* RHEL5 patch: linux-2.6-nfs-v4-r-w-perms-for-user-do-not-work-on-client.patch