Re: udev-140 Bug: udevadm test changing mode of /dev to 660, so making /dev unusuable for users

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On Wed, Mar 18, 2009 at 11:21, Matthias Schwarzott <zzam@xxxxxxxxxx> wrote:
> This time I have a very strange error. I tried what happens when using
> # udevadm test /sys/class/mem/null
>
> and strange, a bit later some user processes had problems accessing /dev/null.
> A quick check showed, that the permissions of /dev were destroyed.
>
> # ls -ld /dev /dev/null
> drw-rw---- 16 root root 4280 18. Mär 11:14 /dev
> crw-rw-rw-  1 root root 1, 3 17. Mär 08:05 /dev/null
>
> Changing it back to 775 and retrying showed, that it must be udevadm test that
> destroys it.
>
> # ls -ld /dev /dev/null
> drwxrwxr-x 16 root root 4280 18. Mär 11:05 /dev
> crw-rw-rw-  1 root root 1, 3 17. Mär 08:05 /dev/null
>
> # udevadm test /sys/class/mem/null/

> udev_device_read_db: device 0x8d122c8 filled with db symlink data '/dev/'
...
> udev_node_add: creating device node '/dev/', devnum=1:3, mode=0660, uid=0,  gid=0
> udev_node_mknod: atomically replace existing file '/dev/'

Hmm, strange. What happended to your device node name?

I get:
  udev_device_read_db: device 0x62d3d0 filled with db symlink data '/dev/null'
  ...
  udev_node_add: creating device node '/dev/null', devnum=1:3,
mode=0666, uid=0, gid=0

Kay
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