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-rw-r--r--security/device_cgroup.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index 4b877a9..e3ce02a 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -42,6 +42,7 @@ struct dev_whitelist_item {
struct dev_cgroup {
struct cgroup_subsys_state css;
struct list_head whitelist;
+ bool deny_all;
};
static inline struct dev_cgroup *css_to_devcgroup(struct cgroup_subsys_state *s)
@@ -178,12 +179,14 @@ static struct cgroup_subsys_state *devcgroup_create(struct cgroup *cgroup)
wh->minor = wh->major = ~0;
wh->type = DEV_ALL;
wh->access = ACC_MASK;
+ dev_cgroup->deny_all = false;
list_add(&wh->list, &dev_cgroup->whitelist);
} else {
parent_dev_cgroup = cgroup_to_devcgroup(parent_cgroup);
mutex_lock(&devcgroup_mutex);
ret = dev_whitelist_copy(&dev_cgroup->whitelist,
&parent_dev_cgroup->whitelist);
+ dev_cgroup->deny_all = parent_dev_cgroup->deny_all;
mutex_unlock(&devcgroup_mutex);
if (ret) {
kfree(dev_cgroup);
@@ -409,9 +412,11 @@ handle:
case DEVCG_ALLOW:
if (!parent_has_perm(devcgroup, &wh))
return -EPERM;
+ devcgroup->deny_all = false;
return dev_whitelist_add(devcgroup, &wh);
case DEVCG_DENY:
dev_whitelist_rm(devcgroup, &wh);
+ devcgroup->deny_all = true;
break;
default:
return -EINVAL;
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