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>

1 files changed, 28 insertions, 3 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index f6e7b4a..241b74a 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2199,6 +2199,24 @@ out_free_group_list:
 	return retval;
 }
 
+static int cgroup_allow_attach(struct cgroup *cgrp, struct task_struct *tsk)
+{
+	struct cgroup_subsys *ss;
+	int ret;
+
+	for_each_subsys(cgrp->root, ss) {
+		if (ss->allow_attach) {
+			ret = ss->allow_attach(cgrp, tsk);
+			if (ret)
+				return ret;
+		} else {
+			return -EACCES;
+		}
+	}
+
+	return 0;
+}
+
 /*
  * Find the task_struct of the task to attach by vpid and pass it along to the
  * function to attach either it or all tasks in its threadgroup. Will take
@@ -2244,9 +2262,16 @@ static int attach_task_by_pid(struct cgroup *cgrp, u64 pid, bool threadgroup)
 		if (cred->euid &&
 		    cred->euid != tcred->uid &&
 		    cred->euid != tcred->suid) {
-			rcu_read_unlock();
-			cgroup_unlock();
-			return -EACCES;
+			/*
+			 * if the default permission check fails, give each
+			 * cgroup a chance to extend the permission check
+			 */
+			ret = cgroup_allow_attach(cgrp, tsk);
+			if (ret) {
+				rcu_read_unlock();
+				cgroup_unlock();
+				return ret;
+			}
 		}
 		get_task_struct(tsk);
 		rcu_read_unlock();