Hello All,
I found the "devices.allow" file can't be opened in read-write mode on
the 3.14 kernel. I uses libcgroup, which opens devices.allow with
O_RDWR. This works fine before 3.14 and fails one 3.14. This files has
write-only permissions. I have tried to create a regular file with the
same permission and kernel allows to open it with O_RDWR.
So what do you think is it a problem, which must be fixed?
5136 stat("/sys/fs/cgroup/devices//vz-101/devices.allow",
{st_mode=S_IFREG|0200, st_size=0, ...}) = 0
5136 open("/sys/fs/cgroup/devices//vz-101/devices.allow",
O_RDONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
Linux avagin-fc19-cr 3.14.0+ #294 SMP Fri Apr 11 20:02:26 MSK 2014
x86_64 x86_64 x86_64 GNU/Linux
----> 1 os.open("/sys/fs/cgroup/devices/devices.deny", os.O_RDWR)
OSError: [Errno 13] Permission denied: '/sys/fs/cgroup/devices/devices.deny'
[root@avagin-fc19-cr ~]# ls -l /sys/fs/cgroup/devices/devices.deny
--w------- 1 root root 0 May 7 15:16 /sys/fs/cgroup/devices/devices.deny
Linux localhost.localdomain 3.13.8-200.fc20.x86_64 #1 SMP Tue Apr 1
03:35:46 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
In [2]: os.open("/sys/fs/cgroup/devices/devices.deny", os.O_RDWR)
Out[2]: 5
[root@localhost avagin]# ls -l /sys/fs/cgroup/devices/devices.deny
--w------- 1 root root 0 May 3 16:12 /sys/fs/cgroup/devices/devices.deny
Thanks,
Andrey
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