01 Nov, 2011

1 commit

• 8a2445486   device_cgroup.h: delete needless include <linux/module.h> ... Browse Code »

  There is nothing modular in this file, and no reason to drag
  in all the extra headers that module.h brings with it, since
  it just slows down compiles.

  Signed-off-by: Paul Gortmaker

  Paul Gortmaker

  2011-11-01 07:32:26 +0800  

20 Jun, 2011

1 commit

• 482e0cd3d   devcgroup_inode_permission: take "is it a device node" checks to inlined wrapper ... Browse Code »

  inode_permission() calls devcgroup_inode_permission() and almost all such
  calls are _not_ for device nodes; let's at least keep the common path
  straight...

  Signed-off-by: Al Viro

  Al Viro

  2011-06-20 22:46:04 +0800  

29 Apr, 2008

1 commit

• 08ce5f16e   cgroups: implement device whitelist ... Browse Code »

  Implement a cgroup to track and enforce open and mknod restrictions on device
  files. A device cgroup associates a device access whitelist with each cgroup.
  A whitelist entry has 4 fields. 'type' is a (all), c (char), or b (block).
  'all' means it applies to all types and all major and minor numbers. Major
  and minor are either an integer or * for all. Access is a composition of r
  (read), w (write), and m (mknod).

  The root device cgroup starts with rwm to 'all'. A child devcg gets a copy of
  the parent. Admins can then remove devices from the whitelist or add new
  entries. A child cgroup can never receive a device access which is denied its
  parent. However when a device access is removed from a parent it will not
  also be removed from the child(ren).

  An entry is added using devices.allow, and removed using
  devices.deny. For instance

  echo 'c 1:3 mr' > /cgroups/1/devices.allow

  allows cgroup 1 to read and mknod the device usually known as
  /dev/null. Doing

  echo a > /cgroups/1/devices.deny

  will remove the default 'a *:* mrw' entry.

  CAP_SYS_ADMIN is needed to change permissions or move another task to a new
  cgroup. A cgroup may not be granted more permissions than the cgroup's parent
  has. Any task can move itself between cgroups. This won't be sufficient, but
  we can decide the best way to adequately restrict movement later.

  [akpm@linux-foundation.org: coding-style fixes]
  [akpm@linux-foundation.org: fix may-be-used-uninitialized warning]
  Signed-off-by: Serge E. Hallyn
  Acked-by: James Morris
  Looks-good-to: Pavel Emelyanov
  Cc: Daniel Hokka Zakrisson
  Cc: Li Zefan
  Cc: Paul Menage
  Cc: Balbir Singh
  Cc: KAMEZAWA Hiroyuki
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Serge E. Hallyn

  2008-04-29 23:06:09 +0800