[LinuxPPS] 13 Jul 19:51 - devcgroup: fix permission check when adding entry to child cgroup

[linuxpps: Li Zefan <>]

devcgroup: fix permission check when adding entry to child cgroup  
  
# cat devices.list  
c 1:3 r  
# echo 'c 1:3 w' > sub/devices.allow  
# cat sub/devices.list  
c 1:3 w  
  
As illustrated, the parent group has no write permission to /dev/null, so  
it's child should not be allowed to add this write permission.  
  
Signed-off-by: Li Zefan   
Acked-by: Serge Hallyn   
Cc: Serge Hallyn   
Cc: Paul Menage   
Cc: Pavel Emelyanov   
Signed-off-by: Andrew Morton   
Signed-off-by: Linus Torvalds   
  
security/device_cgroup.c

URL: http://gitweb.enneenne.com/?p=linuxpps;a=commit;h=ec229e830060091b9be63c8f873c1b2407a82821