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-rw-r--r--security/device_cgroup.c65
1 files changed, 26 insertions, 39 deletions
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index e8aad69f0d69..c123628d3f84 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -53,22 +53,17 @@ struct dev_cgroup {
static inline struct dev_cgroup *css_to_devcgroup(struct cgroup_subsys_state *s)
{
- return container_of(s, struct dev_cgroup, css);
-}
-
-static inline struct dev_cgroup *cgroup_to_devcgroup(struct cgroup *cgroup)
-{
- return css_to_devcgroup(cgroup_subsys_state(cgroup, devices_subsys_id));
+ return s ? container_of(s, struct dev_cgroup, css) : NULL;
}
static inline struct dev_cgroup *task_devcgroup(struct task_struct *task)
{
- return css_to_devcgroup(task_subsys_state(task, devices_subsys_id));
+ return css_to_devcgroup(task_css(task, devices_subsys_id));
}
struct cgroup_subsys devices_subsys;
-static int devcgroup_can_attach(struct cgroup *new_cgrp,
+static int devcgroup_can_attach(struct cgroup_subsys_state *new_css,
struct cgroup_taskset *set)
{
struct task_struct *task = cgroup_taskset_first(set);
@@ -193,18 +188,16 @@ static inline bool is_devcg_online(const struct dev_cgroup *devcg)
/**
* devcgroup_online - initializes devcgroup's behavior and exceptions based on
* parent's
- * @cgroup: cgroup getting online
+ * @css: css getting online
* returns 0 in case of success, error code otherwise
*/
-static int devcgroup_online(struct cgroup *cgroup)
+static int devcgroup_online(struct cgroup_subsys_state *css)
{
- struct dev_cgroup *dev_cgroup, *parent_dev_cgroup = NULL;
+ struct dev_cgroup *dev_cgroup = css_to_devcgroup(css);
+ struct dev_cgroup *parent_dev_cgroup = css_to_devcgroup(css_parent(css));
int ret = 0;
mutex_lock(&devcgroup_mutex);
- dev_cgroup = cgroup_to_devcgroup(cgroup);
- if (cgroup->parent)
- parent_dev_cgroup = cgroup_to_devcgroup(cgroup->parent);
if (parent_dev_cgroup == NULL)
dev_cgroup->behavior = DEVCG_DEFAULT_ALLOW;
@@ -219,9 +212,9 @@ static int devcgroup_online(struct cgroup *cgroup)
return ret;
}
-static void devcgroup_offline(struct cgroup *cgroup)
+static void devcgroup_offline(struct cgroup_subsys_state *css)
{
- struct dev_cgroup *dev_cgroup = cgroup_to_devcgroup(cgroup);
+ struct dev_cgroup *dev_cgroup = css_to_devcgroup(css);
mutex_lock(&devcgroup_mutex);
dev_cgroup->behavior = DEVCG_DEFAULT_NONE;
@@ -231,7 +224,8 @@ static void devcgroup_offline(struct cgroup *cgroup)
/*
* called from kernel/cgroup.c with cgroup_lock() held.
*/
-static struct cgroup_subsys_state *devcgroup_css_alloc(struct cgroup *cgroup)
+static struct cgroup_subsys_state *
+devcgroup_css_alloc(struct cgroup_subsys_state *parent_css)
{
struct dev_cgroup *dev_cgroup;
@@ -244,11 +238,10 @@ static struct cgroup_subsys_state *devcgroup_css_alloc(struct cgroup *cgroup)
return &dev_cgroup->css;
}
-static void devcgroup_css_free(struct cgroup *cgroup)
+static void devcgroup_css_free(struct cgroup_subsys_state *css)
{
- struct dev_cgroup *dev_cgroup;
+ struct dev_cgroup *dev_cgroup = css_to_devcgroup(css);
- dev_cgroup = cgroup_to_devcgroup(cgroup);
__dev_exception_clean(dev_cgroup);
kfree(dev_cgroup);
}
@@ -291,10 +284,10 @@ static void set_majmin(char *str, unsigned m)
sprintf(str, "%u", m);
}
-static int devcgroup_seq_read(struct cgroup *cgroup, struct cftype *cft,
- struct seq_file *m)
+static int devcgroup_seq_read(struct cgroup_subsys_state *css,
+ struct cftype *cft, struct seq_file *m)
{
- struct dev_cgroup *devcgroup = cgroup_to_devcgroup(cgroup);
+ struct dev_cgroup *devcgroup = css_to_devcgroup(css);
struct dev_exception_item *ex;
char maj[MAJMINLEN], min[MAJMINLEN], acc[ACCLEN];
@@ -394,12 +387,10 @@ static bool may_access(struct dev_cgroup *dev_cgroup,
static int parent_has_perm(struct dev_cgroup *childcg,
struct dev_exception_item *ex)
{
- struct cgroup *pcg = childcg->css.cgroup->parent;
- struct dev_cgroup *parent;
+ struct dev_cgroup *parent = css_to_devcgroup(css_parent(&childcg->css));
- if (!pcg)
+ if (!parent)
return 1;
- parent = cgroup_to_devcgroup(pcg);
return may_access(parent, ex, childcg->behavior);
}
@@ -451,13 +442,13 @@ static void revalidate_active_exceptions(struct dev_cgroup *devcg)
static int propagate_exception(struct dev_cgroup *devcg_root,
struct dev_exception_item *ex)
{
- struct cgroup *root = devcg_root->css.cgroup, *pos;
+ struct cgroup_subsys_state *pos;
int rc = 0;
rcu_read_lock();
- cgroup_for_each_descendant_pre(pos, root) {
- struct dev_cgroup *devcg = cgroup_to_devcgroup(pos);
+ css_for_each_descendant_pre(pos, &devcg_root->css) {
+ struct dev_cgroup *devcg = css_to_devcgroup(pos);
/*
* Because devcgroup_mutex is held, no devcg will become
@@ -465,7 +456,7 @@ static int propagate_exception(struct dev_cgroup *devcg_root,
* methods), and online ones are safe to access outside RCU
* read lock without bumping refcnt.
*/
- if (!is_devcg_online(devcg))
+ if (pos == &devcg_root->css || !is_devcg_online(devcg))
continue;
rcu_read_unlock();
@@ -524,15 +515,11 @@ static int devcgroup_update_access(struct dev_cgroup *devcgroup,
char temp[12]; /* 11 + 1 characters needed for a u32 */
int count, rc = 0;
struct dev_exception_item ex;
- struct cgroup *p = devcgroup->css.cgroup;
- struct dev_cgroup *parent = NULL;
+ struct dev_cgroup *parent = css_to_devcgroup(css_parent(&devcgroup->css));
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- if (p->parent)
- parent = cgroup_to_devcgroup(p->parent);
-
memset(&ex, 0, sizeof(ex));
b = buffer;
@@ -677,13 +664,13 @@ static int devcgroup_update_access(struct dev_cgroup *devcgroup,
return rc;
}
-static int devcgroup_access_write(struct cgroup *cgrp, struct cftype *cft,
- const char *buffer)
+static int devcgroup_access_write(struct cgroup_subsys_state *css,
+ struct cftype *cft, const char *buffer)
{
int retval;
mutex_lock(&devcgroup_mutex);
- retval = devcgroup_update_access(cgroup_to_devcgroup(cgrp),
+ retval = devcgroup_update_access(css_to_devcgroup(css),
cft->private, buffer);
mutex_unlock(&devcgroup_mutex);
return retval;