leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

security, keys: convert key_user.usage from atomic_t to refcount_t

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

2
security/keys/process_keys.c
View File

@@ -30,7 +30,7 @@ static DEFINE_MUTEX(key_user_keyring_mutex);
/* The root user's tracking struct */
struct key_user root_key_user = {
.usage = ATOMIC_INIT(3),
.usage = REFCOUNT_INIT(3),
.cons_lock = __MUTEX_INITIALIZER(root_key_user.cons_lock),
.lock = __SPIN_LOCK_UNLOCKED(root_key_user.lock),
.nkeys = ATOMIC_INIT(2),