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Message-Id: <1482994571-18687-14-git-send-email-elena.reshetova@intel.com>
Date: Thu, 29 Dec 2016 08:56:05 +0200
From: Elena Reshetova <elena.reshetova@...el.com>
To: kernel-hardening@...ts.openwall.com
Cc: keescook@...omium.org,
arnd@...db.de,
tglx@...utronix.de,
mingo@...hat.com,
h.peter.anvin@...el.com,
peterz@...radead.org,
will.deacon@....com,
dwindsor@...il.com,
gregkh@...uxfoundation.org,
ishkamiel@...il.com,
Elena Reshetova <elena.reshetova@...el.com>
Subject: [RFC PATCH 13/19] ipc: covert 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. Convert the cases found.
Signed-off-by: Elena Reshetova <elena.reshetova@...el.com>
---
include/linux/ipc_namespace.h | 5 +++--
ipc/namespace.c | 4 ++--
ipc/sem.c | 8 ++++----
ipc/util.c | 6 +++---
ipc/util.h | 3 ++-
5 files changed, 14 insertions(+), 12 deletions(-)
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index 848e579..7230638 100644
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h
@@ -7,6 +7,7 @@
#include <linux/notifier.h>
#include <linux/nsproxy.h>
#include <linux/ns_common.h>
+#include <linux/refcount.h>
struct user_namespace;
@@ -19,7 +20,7 @@ struct ipc_ids {
};
struct ipc_namespace {
- atomic_t count;
+ refcount_t count;
struct ipc_ids ids[3];
int sem_ctls[4];
@@ -118,7 +119,7 @@ extern struct ipc_namespace *copy_ipcs(unsigned long flags,
static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
{
if (ns)
- atomic_inc(&ns->count);
+ refcount_inc(&ns->count);
return ns;
}
diff --git a/ipc/namespace.c b/ipc/namespace.c
index 0abdea4..ed10bbc 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -48,7 +48,7 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
goto fail_free;
ns->ns.ops = &ipcns_operations;
- atomic_set(&ns->count, 1);
+ refcount_set(&ns->count, 1);
ns->user_ns = get_user_ns(user_ns);
ns->ucounts = ucounts;
@@ -142,7 +142,7 @@ static void free_ipc_ns(struct ipc_namespace *ns)
*/
void put_ipc_ns(struct ipc_namespace *ns)
{
- if (atomic_dec_and_lock(&ns->count, &mq_lock)) {
+ if (refcount_dec_and_lock(&ns->count, &mq_lock)) {
mq_clear_sbinfo(ns);
spin_unlock(&mq_lock);
mq_put_mnt(ns);
diff --git a/ipc/sem.c b/ipc/sem.c
index e08b948..04bab9b 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -139,7 +139,7 @@ struct sem_undo {
* that may be shared among all a CLONE_SYSVSEM task group.
*/
struct sem_undo_list {
- atomic_t refcnt;
+ refcount_t refcnt;
spinlock_t lock;
struct list_head list_proc;
};
@@ -1629,7 +1629,7 @@ static inline int get_undo_list(struct sem_undo_list **undo_listp)
if (undo_list == NULL)
return -ENOMEM;
spin_lock_init(&undo_list->lock);
- atomic_set(&undo_list->refcnt, 1);
+ refcount_set(&undo_list->refcnt, 1);
INIT_LIST_HEAD(&undo_list->list_proc);
current->sysvsem.undo_list = undo_list;
@@ -2028,7 +2028,7 @@ int copy_semundo(unsigned long clone_flags, struct task_struct *tsk)
error = get_undo_list(&undo_list);
if (error)
return error;
- atomic_inc(&undo_list->refcnt);
+ refcount_inc(&undo_list->refcnt);
tsk->sysvsem.undo_list = undo_list;
} else
tsk->sysvsem.undo_list = NULL;
@@ -2057,7 +2057,7 @@ void exit_sem(struct task_struct *tsk)
return;
tsk->sysvsem.undo_list = NULL;
- if (!atomic_dec_and_test(&ulp->refcnt))
+ if (!refcount_dec_and_test(&ulp->refcnt))
return;
for (;;) {
diff --git a/ipc/util.c b/ipc/util.c
index 798cad1..24484a6 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -437,7 +437,7 @@ void *ipc_rcu_alloc(int size)
struct ipc_rcu *out = ipc_alloc(sizeof(struct ipc_rcu) + size);
if (unlikely(!out))
return NULL;
- atomic_set(&out->refcount, 1);
+ refcount_set(&out->refcount, 1);
return out + 1;
}
@@ -445,14 +445,14 @@ int ipc_rcu_getref(void *ptr)
{
struct ipc_rcu *p = ((struct ipc_rcu *)ptr) - 1;
- return atomic_inc_not_zero(&p->refcount);
+ return refcount_inc_not_zero(&p->refcount);
}
void ipc_rcu_putref(void *ptr, void (*func)(struct rcu_head *head))
{
struct ipc_rcu *p = ((struct ipc_rcu *)ptr) - 1;
- if (!atomic_dec_and_test(&p->refcount))
+ if (!refcount_dec_and_test(&p->refcount))
return;
call_rcu(&p->rcu, func);
diff --git a/ipc/util.h b/ipc/util.h
index 51f7ca5..274ec9b 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -12,6 +12,7 @@
#include <linux/unistd.h>
#include <linux/err.h>
+#include <linux/refcount.h>
#define SEQ_MULTIPLIER (IPCMNI)
@@ -49,7 +50,7 @@ static inline void shm_exit_ns(struct ipc_namespace *ns) { }
struct ipc_rcu {
struct rcu_head rcu;
- atomic_t refcount;
+ refcount_t refcount;
} ____cacheline_aligned_in_smp;
#define ipc_rcu_to_struct(p) ((void *)(p+1))
--
2.7.4
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