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authorTejun Heo <tj@kernel.org>2014-05-16 13:22:52 -0400
committerTejun Heo <tj@kernel.org>2014-05-16 13:22:52 -0400
commit7a3bb24f7c5ceebad19b12b66fd832a27a7e90df (patch)
treefc1d5735096c2d0012f9a1e3235279397a7011b5 /security
parentf3d4650015301d1c880df4523f7e7ef320a38aab (diff)
device_cgroup: use css_has_online_children() instead of has_children()
devcgroup_update_access() wants to know whether there are child cgroups which are online and visible to userland and has_children() may return false positive. Replace it with css_has_online_children(). Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Aristeu Rozanski <aris@redhat.com> Acked-by: Serge Hallyn <serge.hallyn@ubuntu.com> Acked-by: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'security')
-rw-r--r--security/device_cgroup.c19
1 files changed, 2 insertions, 17 deletions
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index 084c8e417564..d9d69e6930ed 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -587,21 +587,6 @@ static int propagate_exception(struct dev_cgroup *devcg_root,
return rc;
}
-static inline bool has_children(struct dev_cgroup *devcgroup)
-{
- bool ret;
-
- /*
- * FIXME: There may be lingering offline csses and this function
- * may return %true when there isn't any userland-visible child
- * which is incorrect for our purposes.
- */
- rcu_read_lock();
- ret = css_next_child(NULL, &devcgroup->css);
- rcu_read_unlock();
- return ret;
-}
-
/*
* Modify the exception list using allow/deny rules.
* CAP_SYS_ADMIN is needed for this. It's at least separate from CAP_MKNOD
@@ -634,7 +619,7 @@ static int devcgroup_update_access(struct dev_cgroup *devcgroup,
case 'a':
switch (filetype) {
case DEVCG_ALLOW:
- if (has_children(devcgroup))
+ if (css_has_online_children(&devcgroup->css))
return -EINVAL;
if (!may_allow_all(parent))
@@ -650,7 +635,7 @@ static int devcgroup_update_access(struct dev_cgroup *devcgroup,
return rc;
break;
case DEVCG_DENY:
- if (has_children(devcgroup))
+ if (css_has_online_children(&devcgroup->css))
return -EINVAL;
dev_exception_clean(devcgroup);

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