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net: convert unix_address.refcnt 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: David S. Miller <davem@davemloft.net>
This commit is contained in:
Reshetova, Elena 2017-06-30 13:08:05 +03:00 • committed by David S. Miller
parent 433cea4d9b
commit 8c9814b970
2 changed files with 6 additions and 5 deletions
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3
include/net/af_unix.h
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@ -4,6 +4,7 @@
#include <linux/socket.h>
#include <linux/un.h>
#include <linux/mutex.h>
#include <linux/refcount.h>
#include <net/sock.h>
void unix_inflight(struct user_struct *user, struct file *fp);
@ -21,7 +22,7 @@ extern spinlock_t unix_table_lock;
extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
struct unix_address {
atomic_t refcnt;
refcount_t refcnt;
int len;
unsigned int hash;
struct sockaddr_un name[0];