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security, keys: convert key_user.usage 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>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
This commit is contained in:
Elena Reshetova
2017-03-31 15:20:49 +03:00
committed by James Morris
parent fff292914d
commit ddb99e118e
4 changed files with 7 additions and 6 deletions
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3
security/keys/internal.h
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@@ -17,6 +17,7 @@
#include <linux/key-type.h>
#include <linux/task_work.h>
#include <linux/keyctl.h>
#include <linux/refcount.h>
struct iovec;
@@ -53,7 +54,7 @@ struct key_user {
struct rb_node node;
struct mutex cons_lock; /* construction initiation lock */
spinlock_t lock;
atomic_t usage; /* for accessing qnkeys & qnbytes */
refcount_t usage; /* for accessing qnkeys & qnbytes */
atomic_t nkeys; /* number of keys */
atomic_t nikeys; /* number of instantiated keys */
kuid_t uid;