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authorElena Reshetova <elena.reshetova@intel.com>2017-03-08 11:00:40 +0300
committerTejun Heo <tj@kernel.org>2017-03-09 01:46:03 +0300
commit4b9502e63b5e2b1b5ef491919d3219b9440fe0b3 (patch)
tree75ede84d703f3e230322be6f11b87625ba9ab72f /include/linux/cgroup-defs.h
parent387ad9674b0013c8756ad20d854ff005b0c313ad (diff)
downloadlinux-4b9502e63b5e2b1b5ef491919d3219b9440fe0b3.tar.xz
kernel: convert css_set.refcount from atomic_t to refcount_t
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>
Diffstat (limited to 'include/linux/cgroup-defs.h')
-rw-r--r--include/linux/cgroup-defs.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index 6a3f850cabab..c74b78ecd583 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -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;