ipc/shm: remove special shm_alloc/free

There is nothing special about the shm_alloc/free routines any more, so
remove them to make code more readable.

[manfred@colorfullife.com: Rediff, to continue to keep rcu for free calls after a successful security_shm_alloc()]
Link: http://lkml.kernel.org/r/20170525185107.12869-18-manfred@colorfullife.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 20 deletions

diff --git a/ipc/shm.c b/ipc/shm.c
index d1988ef821a1..28a444861a8f 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -172,11 +172,6 @@ static inline void shm_lock_by_ptr(struct shmid_kernel *ipcp)
         ipc_lock_object(&ipcp->shm_perm);
 }
 
-static void __shm_free(struct shmid_kernel *shp)
-{
-        kvfree(shp);
-}
-
 static void shm_rcu_free(struct rcu_head *head)
 {
         struct kern_ipc_perm *ptr = container_of(head, struct kern_ipc_perm,
@@ -184,7 +179,7 @@ static void shm_rcu_free(struct rcu_head *head)
         struct shmid_kernel *shp = container_of(ptr, struct shmid_kernel,
                                                         shm_perm);
         security_shm_free(shp);
-        __shm_free(shp);
+        kvfree(shp);
 }
 
 static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)
@@ -518,17 +513,6 @@ static const struct vm_operations_struct shm_vm_ops = {
 #endif
 };
 
-static struct shmid_kernel *shm_alloc(void)
-{
-        struct shmid_kernel *shp;
-
-        shp = kvmalloc(sizeof(*shp), GFP_KERNEL);
-        if (unlikely(!shp))
-                return NULL;
-
-        return shp;
-}
-
 /**
  * newseg - Create a new shared memory segment
  * @ns: namespace
@@ -558,8 +542,8 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
                         ns->shm_tot + numpages > ns->shm_ctlall)
                 return -ENOSPC;
 
-        shp = shm_alloc();
-        if (!shp)
+        shp = kvmalloc(sizeof(*shp), GFP_KERNEL);
+        if (unlikely(!shp))
                 return -ENOMEM;
 
         shp->shm_perm.key = key;
@@ -569,7 +553,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
         shp->shm_perm.security = NULL;
         error = security_shm_alloc(shp);
         if (error) {
-                __shm_free(shp);
+                kvfree(shp);
                 return error;
         }