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kernel: convert css_set.refcount from atomic_t to refcount_t

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refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Elena Reshetova
2017-03-08 10:00:40 +02:00
committed by Tejun Heo
parent 387ad9674b
commit 4b9502e63b
4 changed files with 10 additions and 8 deletions
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3
include/linux/cgroup-defs.h
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@@ -13,6 +13,7 @@
#include <linux/wait.h>
#include <linux/mutex.h>
#include <linux/rcupdate.h>
#include <linux/refcount.h>
#include <linux/percpu-refcount.h>
#include <linux/percpu-rwsem.h>
#include <linux/workqueue.h>
@@ -156,7 +157,7 @@ struct css_set {
struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
/* reference count */
atomic_t refcount;
refcount_t refcount;
/* the default cgroup associated with this css_set */
struct cgroup *dfl_cgrp;