diff options
author | Colin Cross <ccross@android.com> | 2011-07-12 19:53:24 -0700 |
---|---|---|
committer | Nitin Garg <nitin.garg@freescale.com> | 2014-04-21 22:34:36 -0500 |
commit | a610abc9f079310459d604869153e92c261b7f6b (patch) | |
tree | 6bb2b8cc6562e9817c15d36ee41c8f9a5dc9fdd9 /Documentation | |
parent | 5e56e0b1f1b761d1730d263df6a9a3b6806466e6 (diff) |
cgroup: Add generic cgroup subsystem permission checks
Rather than using explicit euid == 0 checks when trying to move
tasks into a cgroup via CFS, move permission checks into each
specific cgroup subsystem. If a subsystem does not specify a
'allow_attach' handler, then we fall back to doing our checks
the old way.
Use the 'allow_attach' handler for the 'cpu' cgroup to allow
non-root processes to add arbitrary processes to a 'cpu' cgroup
if it has the CAP_SYS_NICE capability set.
This version of the patch adds a 'allow_attach' handler instead
of reusing the 'can_attach' handler. If the 'can_attach' handler
is reused, a new cgroup that implements 'can_attach' but not
the permission checks could end up with no permission checks
at all.
Change-Id: Icfa950aa9321d1ceba362061d32dc7dfa2c64f0c
Original-Author: San Mehat <san@google.com>
Signed-off-by: Colin Cross <ccross@android.com>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/cgroups/cgroups.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt index 638bf17ff869..61dc0ec5c9a9 100644 --- a/Documentation/cgroups/cgroups.txt +++ b/Documentation/cgroups/cgroups.txt @@ -598,6 +598,15 @@ is completely unused; @cgrp->parent is still valid. (Note - can also be called for a newly-created cgroup if an error occurs after this subsystem's create() method has been called for the new cgroup). +int allow_attach(struct cgroup *cgrp, struct cgroup_taskset *tset) +(cgroup_mutex held by caller) + +Called prior to moving a task into a cgroup; if the subsystem +returns an error, this will abort the attach operation. Used +to extend the permission checks - if all subsystems in a cgroup +return 0, the attach will be allowed to proceed, even if the +default permission check (root or same user) fails. + int can_attach(struct cgroup *cgrp, struct cgroup_taskset *tset) (cgroup_mutex held by caller) |