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authorLi Zefan <lizf@cn.fujitsu.com>2008-07-04 10:00:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-04 10:40:10 -0700
commitd823f6bfec2844493c05961133895de21fa0e02d (patch)
tree853fac4a97ab842f9ee52adfbf72297e8b90688d /Documentation/controllers
parent26ff8c697a2c8f6974c2357d3f01cca91b20c964 (diff)
downloadop-kernel-dev-d823f6bfec2844493c05961133895de21fa0e02d.zip
op-kernel-dev-d823f6bfec2844493c05961133895de21fa0e02d.tar.gz
devcgroup: fix odd behaviour when writing 'a' to devices.allow
# cat /devcg/devices.list a *:* rwm # echo a > devices.allow # cat /devcg/devices.list a *:* rwm a 0:0 rwm This is odd and maybe confusing. With this patch, writing 'a' to devices.allow will add 'a *:* rwm' to the whitelist. Also a few fixes and updates to the document. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Serge E. Hallyn <serue@us.ibm.com> Cc: Paul Menage <menage@google.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: James Morris <jmorris@namei.org> Cc: Chris Wright <chrisw@sous-sol.org> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/controllers')
-rw-r--r--Documentation/controllers/devices.txt8
1 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/controllers/devices.txt b/Documentation/controllers/devices.txt
index 4dcea42..7cc6e6a 100644
--- a/Documentation/controllers/devices.txt
+++ b/Documentation/controllers/devices.txt
@@ -13,7 +13,7 @@ either an integer or * for all. Access is a composition of r
The root device cgroup starts with rwm to 'all'. A child device
cgroup gets a copy of the parent. Administrators 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
+never receive a device access which is denied by its parent. However
when a device access is removed from a parent it will not also be
removed from the child(ren).
@@ -29,7 +29,11 @@ allows cgroup 1 to read and mknod the device usually known as
echo a > /cgroups/1/devices.deny
-will remove the default 'a *:* mrw' entry.
+will remove the default 'a *:* rwm' entry. Doing
+
+ echo a > /cgroups/1/devices.allow
+
+will add the 'a *:* rwm' entry to the whitelist.
3. Security
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